1 /* Xtensa-specific support for 32-bit ELF.
2 Copyright 2003, 2004, 2005, 2006, 2007 Free Software Foundation, Inc.
4 This file is part of BFD, the Binary File Descriptor library.
6 This program is free software; you can redistribute it and/or
7 modify it under the terms of the GNU General Public License as
8 published by the Free Software Foundation; either version 2 of the
9 License, or (at your option) any later version.
11 This program is distributed in the hope that it will be useful, but
12 WITHOUT ANY WARRANTY; without even the implied warranty of
13 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
14 General Public License for more details.
16 You should have received a copy of the GNU General Public License
17 along with this program; if not, write to the Free Software
18 Foundation, Inc., 51 Franklin Street - Fifth Floor, Boston, MA
30 #include "elf/xtensa.h"
31 #include "xtensa-isa.h"
32 #include "xtensa-config.h"
34 #define XTENSA_NO_NOP_REMOVAL 0
36 /* Local helper functions. */
38 static bfd_boolean
add_extra_plt_sections (struct bfd_link_info
*, int);
39 static char *vsprint_msg (const char *, const char *, int, ...) ATTRIBUTE_PRINTF(2,4);
40 static bfd_reloc_status_type bfd_elf_xtensa_reloc
41 (bfd
*, arelent
*, asymbol
*, void *, asection
*, bfd
*, char **);
42 static bfd_boolean do_fix_for_relocatable_link
43 (Elf_Internal_Rela
*, bfd
*, asection
*, bfd_byte
*);
44 static void do_fix_for_final_link
45 (Elf_Internal_Rela
*, bfd
*, asection
*, bfd_byte
*, bfd_vma
*);
47 /* Local functions to handle Xtensa configurability. */
49 static bfd_boolean
is_indirect_call_opcode (xtensa_opcode
);
50 static bfd_boolean
is_direct_call_opcode (xtensa_opcode
);
51 static bfd_boolean
is_windowed_call_opcode (xtensa_opcode
);
52 static xtensa_opcode
get_const16_opcode (void);
53 static xtensa_opcode
get_l32r_opcode (void);
54 static bfd_vma
l32r_offset (bfd_vma
, bfd_vma
);
55 static int get_relocation_opnd (xtensa_opcode
, int);
56 static int get_relocation_slot (int);
57 static xtensa_opcode get_relocation_opcode
58 (bfd
*, asection
*, bfd_byte
*, Elf_Internal_Rela
*);
59 static bfd_boolean is_l32r_relocation
60 (bfd
*, asection
*, bfd_byte
*, Elf_Internal_Rela
*);
61 static bfd_boolean
is_alt_relocation (int);
62 static bfd_boolean
is_operand_relocation (int);
63 static bfd_size_type insn_decode_len
64 (bfd_byte
*, bfd_size_type
, bfd_size_type
);
65 static xtensa_opcode insn_decode_opcode
66 (bfd_byte
*, bfd_size_type
, bfd_size_type
, int);
67 static bfd_boolean check_branch_target_aligned
68 (bfd_byte
*, bfd_size_type
, bfd_vma
, bfd_vma
);
69 static bfd_boolean check_loop_aligned
70 (bfd_byte
*, bfd_size_type
, bfd_vma
, bfd_vma
);
71 static bfd_boolean
check_branch_target_aligned_address (bfd_vma
, int);
72 static bfd_size_type get_asm_simplify_size
73 (bfd_byte
*, bfd_size_type
, bfd_size_type
);
75 /* Functions for link-time code simplifications. */
77 static bfd_reloc_status_type elf_xtensa_do_asm_simplify
78 (bfd_byte
*, bfd_vma
, bfd_vma
, char **);
79 static bfd_reloc_status_type contract_asm_expansion
80 (bfd_byte
*, bfd_vma
, Elf_Internal_Rela
*, char **);
81 static xtensa_opcode
swap_callx_for_call_opcode (xtensa_opcode
);
82 static xtensa_opcode
get_expanded_call_opcode (bfd_byte
*, int, bfd_boolean
*);
84 /* Access to internal relocations, section contents and symbols. */
86 static Elf_Internal_Rela
*retrieve_internal_relocs
87 (bfd
*, asection
*, bfd_boolean
);
88 static void pin_internal_relocs (asection
*, Elf_Internal_Rela
*);
89 static void release_internal_relocs (asection
*, Elf_Internal_Rela
*);
90 static bfd_byte
*retrieve_contents (bfd
*, asection
*, bfd_boolean
);
91 static void pin_contents (asection
*, bfd_byte
*);
92 static void release_contents (asection
*, bfd_byte
*);
93 static Elf_Internal_Sym
*retrieve_local_syms (bfd
*);
95 /* Miscellaneous utility functions. */
97 static asection
*elf_xtensa_get_plt_section (struct bfd_link_info
*, int);
98 static asection
*elf_xtensa_get_gotplt_section (struct bfd_link_info
*, int);
99 static asection
*get_elf_r_symndx_section (bfd
*, unsigned long);
100 static struct elf_link_hash_entry
*get_elf_r_symndx_hash_entry
101 (bfd
*, unsigned long);
102 static bfd_vma
get_elf_r_symndx_offset (bfd
*, unsigned long);
103 static bfd_boolean
is_reloc_sym_weak (bfd
*, Elf_Internal_Rela
*);
104 static bfd_boolean
pcrel_reloc_fits (xtensa_opcode
, int, bfd_vma
, bfd_vma
);
105 static bfd_boolean
xtensa_is_property_section (asection
*);
106 static bfd_boolean
xtensa_is_littable_section (asection
*);
107 static int internal_reloc_compare (const void *, const void *);
108 static int internal_reloc_matches (const void *, const void *);
109 extern asection
*xtensa_get_property_section (asection
*, const char *);
110 static flagword
xtensa_get_property_predef_flags (asection
*);
112 /* Other functions called directly by the linker. */
114 typedef void (*deps_callback_t
)
115 (asection
*, bfd_vma
, asection
*, bfd_vma
, void *);
116 extern bfd_boolean xtensa_callback_required_dependence
117 (bfd
*, asection
*, struct bfd_link_info
*, deps_callback_t
, void *);
120 /* Globally visible flag for choosing size optimization of NOP removal
121 instead of branch-target-aware minimization for NOP removal.
122 When nonzero, narrow all instructions and remove all NOPs possible
123 around longcall expansions. */
125 int elf32xtensa_size_opt
;
128 /* The "new_section_hook" is used to set up a per-section
129 "xtensa_relax_info" data structure with additional information used
130 during relaxation. */
132 typedef struct xtensa_relax_info_struct xtensa_relax_info
;
135 /* The GNU tools do not easily allow extending interfaces to pass around
136 the pointer to the Xtensa ISA information, so instead we add a global
137 variable here (in BFD) that can be used by any of the tools that need
140 xtensa_isa xtensa_default_isa
;
143 /* When this is true, relocations may have been modified to refer to
144 symbols from other input files. The per-section list of "fix"
145 records needs to be checked when resolving relocations. */
147 static bfd_boolean relaxing_section
= FALSE
;
149 /* When this is true, during final links, literals that cannot be
150 coalesced and their relocations may be moved to other sections. */
152 int elf32xtensa_no_literal_movement
= 1;
155 static reloc_howto_type elf_howto_table
[] =
157 HOWTO (R_XTENSA_NONE
, 0, 0, 0, FALSE
, 0, complain_overflow_dont
,
158 bfd_elf_xtensa_reloc
, "R_XTENSA_NONE",
160 HOWTO (R_XTENSA_32
, 0, 2, 32, FALSE
, 0, complain_overflow_bitfield
,
161 bfd_elf_xtensa_reloc
, "R_XTENSA_32",
162 TRUE
, 0xffffffff, 0xffffffff, FALSE
),
164 /* Replace a 32-bit value with a value from the runtime linker (only
165 used by linker-generated stub functions). The r_addend value is
166 special: 1 means to substitute a pointer to the runtime linker's
167 dynamic resolver function; 2 means to substitute the link map for
168 the shared object. */
169 HOWTO (R_XTENSA_RTLD
, 0, 2, 32, FALSE
, 0, complain_overflow_dont
,
170 NULL
, "R_XTENSA_RTLD", FALSE
, 0, 0, FALSE
),
172 HOWTO (R_XTENSA_GLOB_DAT
, 0, 2, 32, FALSE
, 0, complain_overflow_bitfield
,
173 bfd_elf_generic_reloc
, "R_XTENSA_GLOB_DAT",
174 FALSE
, 0, 0xffffffff, FALSE
),
175 HOWTO (R_XTENSA_JMP_SLOT
, 0, 2, 32, FALSE
, 0, complain_overflow_bitfield
,
176 bfd_elf_generic_reloc
, "R_XTENSA_JMP_SLOT",
177 FALSE
, 0, 0xffffffff, FALSE
),
178 HOWTO (R_XTENSA_RELATIVE
, 0, 2, 32, FALSE
, 0, complain_overflow_bitfield
,
179 bfd_elf_generic_reloc
, "R_XTENSA_RELATIVE",
180 FALSE
, 0, 0xffffffff, FALSE
),
181 HOWTO (R_XTENSA_PLT
, 0, 2, 32, FALSE
, 0, complain_overflow_bitfield
,
182 bfd_elf_xtensa_reloc
, "R_XTENSA_PLT",
183 FALSE
, 0, 0xffffffff, FALSE
),
187 /* Old relocations for backward compatibility. */
188 HOWTO (R_XTENSA_OP0
, 0, 0, 0, TRUE
, 0, complain_overflow_dont
,
189 bfd_elf_xtensa_reloc
, "R_XTENSA_OP0", FALSE
, 0, 0, TRUE
),
190 HOWTO (R_XTENSA_OP1
, 0, 0, 0, TRUE
, 0, complain_overflow_dont
,
191 bfd_elf_xtensa_reloc
, "R_XTENSA_OP1", FALSE
, 0, 0, TRUE
),
192 HOWTO (R_XTENSA_OP2
, 0, 0, 0, TRUE
, 0, complain_overflow_dont
,
193 bfd_elf_xtensa_reloc
, "R_XTENSA_OP2", FALSE
, 0, 0, TRUE
),
195 /* Assembly auto-expansion. */
196 HOWTO (R_XTENSA_ASM_EXPAND
, 0, 0, 0, TRUE
, 0, complain_overflow_dont
,
197 bfd_elf_xtensa_reloc
, "R_XTENSA_ASM_EXPAND", FALSE
, 0, 0, TRUE
),
198 /* Relax assembly auto-expansion. */
199 HOWTO (R_XTENSA_ASM_SIMPLIFY
, 0, 0, 0, TRUE
, 0, complain_overflow_dont
,
200 bfd_elf_xtensa_reloc
, "R_XTENSA_ASM_SIMPLIFY", FALSE
, 0, 0, TRUE
),
205 /* GNU extension to record C++ vtable hierarchy. */
206 HOWTO (R_XTENSA_GNU_VTINHERIT
, 0, 2, 0, FALSE
, 0, complain_overflow_dont
,
207 NULL
, "R_XTENSA_GNU_VTINHERIT",
209 /* GNU extension to record C++ vtable member usage. */
210 HOWTO (R_XTENSA_GNU_VTENTRY
, 0, 2, 0, FALSE
, 0, complain_overflow_dont
,
211 _bfd_elf_rel_vtable_reloc_fn
, "R_XTENSA_GNU_VTENTRY",
214 /* Relocations for supporting difference of symbols. */
215 HOWTO (R_XTENSA_DIFF8
, 0, 0, 8, FALSE
, 0, complain_overflow_bitfield
,
216 bfd_elf_xtensa_reloc
, "R_XTENSA_DIFF8", FALSE
, 0, 0xff, FALSE
),
217 HOWTO (R_XTENSA_DIFF16
, 0, 1, 16, FALSE
, 0, complain_overflow_bitfield
,
218 bfd_elf_xtensa_reloc
, "R_XTENSA_DIFF16", FALSE
, 0, 0xffff, FALSE
),
219 HOWTO (R_XTENSA_DIFF32
, 0, 2, 32, FALSE
, 0, complain_overflow_bitfield
,
220 bfd_elf_xtensa_reloc
, "R_XTENSA_DIFF32", FALSE
, 0, 0xffffffff, FALSE
),
222 /* General immediate operand relocations. */
223 HOWTO (R_XTENSA_SLOT0_OP
, 0, 0, 0, TRUE
, 0, complain_overflow_dont
,
224 bfd_elf_xtensa_reloc
, "R_XTENSA_SLOT0_OP", FALSE
, 0, 0, TRUE
),
225 HOWTO (R_XTENSA_SLOT1_OP
, 0, 0, 0, TRUE
, 0, complain_overflow_dont
,
226 bfd_elf_xtensa_reloc
, "R_XTENSA_SLOT1_OP", FALSE
, 0, 0, TRUE
),
227 HOWTO (R_XTENSA_SLOT2_OP
, 0, 0, 0, TRUE
, 0, complain_overflow_dont
,
228 bfd_elf_xtensa_reloc
, "R_XTENSA_SLOT2_OP", FALSE
, 0, 0, TRUE
),
229 HOWTO (R_XTENSA_SLOT3_OP
, 0, 0, 0, TRUE
, 0, complain_overflow_dont
,
230 bfd_elf_xtensa_reloc
, "R_XTENSA_SLOT3_OP", FALSE
, 0, 0, TRUE
),
231 HOWTO (R_XTENSA_SLOT4_OP
, 0, 0, 0, TRUE
, 0, complain_overflow_dont
,
232 bfd_elf_xtensa_reloc
, "R_XTENSA_SLOT4_OP", FALSE
, 0, 0, TRUE
),
233 HOWTO (R_XTENSA_SLOT5_OP
, 0, 0, 0, TRUE
, 0, complain_overflow_dont
,
234 bfd_elf_xtensa_reloc
, "R_XTENSA_SLOT5_OP", FALSE
, 0, 0, TRUE
),
235 HOWTO (R_XTENSA_SLOT6_OP
, 0, 0, 0, TRUE
, 0, complain_overflow_dont
,
236 bfd_elf_xtensa_reloc
, "R_XTENSA_SLOT6_OP", FALSE
, 0, 0, TRUE
),
237 HOWTO (R_XTENSA_SLOT7_OP
, 0, 0, 0, TRUE
, 0, complain_overflow_dont
,
238 bfd_elf_xtensa_reloc
, "R_XTENSA_SLOT7_OP", FALSE
, 0, 0, TRUE
),
239 HOWTO (R_XTENSA_SLOT8_OP
, 0, 0, 0, TRUE
, 0, complain_overflow_dont
,
240 bfd_elf_xtensa_reloc
, "R_XTENSA_SLOT8_OP", FALSE
, 0, 0, TRUE
),
241 HOWTO (R_XTENSA_SLOT9_OP
, 0, 0, 0, TRUE
, 0, complain_overflow_dont
,
242 bfd_elf_xtensa_reloc
, "R_XTENSA_SLOT9_OP", FALSE
, 0, 0, TRUE
),
243 HOWTO (R_XTENSA_SLOT10_OP
, 0, 0, 0, TRUE
, 0, complain_overflow_dont
,
244 bfd_elf_xtensa_reloc
, "R_XTENSA_SLOT10_OP", FALSE
, 0, 0, TRUE
),
245 HOWTO (R_XTENSA_SLOT11_OP
, 0, 0, 0, TRUE
, 0, complain_overflow_dont
,
246 bfd_elf_xtensa_reloc
, "R_XTENSA_SLOT11_OP", FALSE
, 0, 0, TRUE
),
247 HOWTO (R_XTENSA_SLOT12_OP
, 0, 0, 0, TRUE
, 0, complain_overflow_dont
,
248 bfd_elf_xtensa_reloc
, "R_XTENSA_SLOT12_OP", FALSE
, 0, 0, TRUE
),
249 HOWTO (R_XTENSA_SLOT13_OP
, 0, 0, 0, TRUE
, 0, complain_overflow_dont
,
250 bfd_elf_xtensa_reloc
, "R_XTENSA_SLOT13_OP", FALSE
, 0, 0, TRUE
),
251 HOWTO (R_XTENSA_SLOT14_OP
, 0, 0, 0, TRUE
, 0, complain_overflow_dont
,
252 bfd_elf_xtensa_reloc
, "R_XTENSA_SLOT14_OP", FALSE
, 0, 0, TRUE
),
254 /* "Alternate" relocations. The meaning of these is opcode-specific. */
255 HOWTO (R_XTENSA_SLOT0_ALT
, 0, 0, 0, TRUE
, 0, complain_overflow_dont
,
256 bfd_elf_xtensa_reloc
, "R_XTENSA_SLOT0_ALT", FALSE
, 0, 0, TRUE
),
257 HOWTO (R_XTENSA_SLOT1_ALT
, 0, 0, 0, TRUE
, 0, complain_overflow_dont
,
258 bfd_elf_xtensa_reloc
, "R_XTENSA_SLOT1_ALT", FALSE
, 0, 0, TRUE
),
259 HOWTO (R_XTENSA_SLOT2_ALT
, 0, 0, 0, TRUE
, 0, complain_overflow_dont
,
260 bfd_elf_xtensa_reloc
, "R_XTENSA_SLOT2_ALT", FALSE
, 0, 0, TRUE
),
261 HOWTO (R_XTENSA_SLOT3_ALT
, 0, 0, 0, TRUE
, 0, complain_overflow_dont
,
262 bfd_elf_xtensa_reloc
, "R_XTENSA_SLOT3_ALT", FALSE
, 0, 0, TRUE
),
263 HOWTO (R_XTENSA_SLOT4_ALT
, 0, 0, 0, TRUE
, 0, complain_overflow_dont
,
264 bfd_elf_xtensa_reloc
, "R_XTENSA_SLOT4_ALT", FALSE
, 0, 0, TRUE
),
265 HOWTO (R_XTENSA_SLOT5_ALT
, 0, 0, 0, TRUE
, 0, complain_overflow_dont
,
266 bfd_elf_xtensa_reloc
, "R_XTENSA_SLOT5_ALT", FALSE
, 0, 0, TRUE
),
267 HOWTO (R_XTENSA_SLOT6_ALT
, 0, 0, 0, TRUE
, 0, complain_overflow_dont
,
268 bfd_elf_xtensa_reloc
, "R_XTENSA_SLOT6_ALT", FALSE
, 0, 0, TRUE
),
269 HOWTO (R_XTENSA_SLOT7_ALT
, 0, 0, 0, TRUE
, 0, complain_overflow_dont
,
270 bfd_elf_xtensa_reloc
, "R_XTENSA_SLOT7_ALT", FALSE
, 0, 0, TRUE
),
271 HOWTO (R_XTENSA_SLOT8_ALT
, 0, 0, 0, TRUE
, 0, complain_overflow_dont
,
272 bfd_elf_xtensa_reloc
, "R_XTENSA_SLOT8_ALT", FALSE
, 0, 0, TRUE
),
273 HOWTO (R_XTENSA_SLOT9_ALT
, 0, 0, 0, TRUE
, 0, complain_overflow_dont
,
274 bfd_elf_xtensa_reloc
, "R_XTENSA_SLOT9_ALT", FALSE
, 0, 0, TRUE
),
275 HOWTO (R_XTENSA_SLOT10_ALT
, 0, 0, 0, TRUE
, 0, complain_overflow_dont
,
276 bfd_elf_xtensa_reloc
, "R_XTENSA_SLOT10_ALT", FALSE
, 0, 0, TRUE
),
277 HOWTO (R_XTENSA_SLOT11_ALT
, 0, 0, 0, TRUE
, 0, complain_overflow_dont
,
278 bfd_elf_xtensa_reloc
, "R_XTENSA_SLOT11_ALT", FALSE
, 0, 0, TRUE
),
279 HOWTO (R_XTENSA_SLOT12_ALT
, 0, 0, 0, TRUE
, 0, complain_overflow_dont
,
280 bfd_elf_xtensa_reloc
, "R_XTENSA_SLOT12_ALT", FALSE
, 0, 0, TRUE
),
281 HOWTO (R_XTENSA_SLOT13_ALT
, 0, 0, 0, TRUE
, 0, complain_overflow_dont
,
282 bfd_elf_xtensa_reloc
, "R_XTENSA_SLOT13_ALT", FALSE
, 0, 0, TRUE
),
283 HOWTO (R_XTENSA_SLOT14_ALT
, 0, 0, 0, TRUE
, 0, complain_overflow_dont
,
284 bfd_elf_xtensa_reloc
, "R_XTENSA_SLOT14_ALT", FALSE
, 0, 0, TRUE
),
289 fprintf (stderr, "Xtensa bfd reloc lookup %d (%s)\n", code, str)
294 static reloc_howto_type
*
295 elf_xtensa_reloc_type_lookup (bfd
*abfd ATTRIBUTE_UNUSED
,
296 bfd_reloc_code_real_type code
)
301 TRACE ("BFD_RELOC_NONE");
302 return &elf_howto_table
[(unsigned) R_XTENSA_NONE
];
305 TRACE ("BFD_RELOC_32");
306 return &elf_howto_table
[(unsigned) R_XTENSA_32
];
308 case BFD_RELOC_XTENSA_DIFF8
:
309 TRACE ("BFD_RELOC_XTENSA_DIFF8");
310 return &elf_howto_table
[(unsigned) R_XTENSA_DIFF8
];
312 case BFD_RELOC_XTENSA_DIFF16
:
313 TRACE ("BFD_RELOC_XTENSA_DIFF16");
314 return &elf_howto_table
[(unsigned) R_XTENSA_DIFF16
];
316 case BFD_RELOC_XTENSA_DIFF32
:
317 TRACE ("BFD_RELOC_XTENSA_DIFF32");
318 return &elf_howto_table
[(unsigned) R_XTENSA_DIFF32
];
320 case BFD_RELOC_XTENSA_RTLD
:
321 TRACE ("BFD_RELOC_XTENSA_RTLD");
322 return &elf_howto_table
[(unsigned) R_XTENSA_RTLD
];
324 case BFD_RELOC_XTENSA_GLOB_DAT
:
325 TRACE ("BFD_RELOC_XTENSA_GLOB_DAT");
326 return &elf_howto_table
[(unsigned) R_XTENSA_GLOB_DAT
];
328 case BFD_RELOC_XTENSA_JMP_SLOT
:
329 TRACE ("BFD_RELOC_XTENSA_JMP_SLOT");
330 return &elf_howto_table
[(unsigned) R_XTENSA_JMP_SLOT
];
332 case BFD_RELOC_XTENSA_RELATIVE
:
333 TRACE ("BFD_RELOC_XTENSA_RELATIVE");
334 return &elf_howto_table
[(unsigned) R_XTENSA_RELATIVE
];
336 case BFD_RELOC_XTENSA_PLT
:
337 TRACE ("BFD_RELOC_XTENSA_PLT");
338 return &elf_howto_table
[(unsigned) R_XTENSA_PLT
];
340 case BFD_RELOC_XTENSA_OP0
:
341 TRACE ("BFD_RELOC_XTENSA_OP0");
342 return &elf_howto_table
[(unsigned) R_XTENSA_OP0
];
344 case BFD_RELOC_XTENSA_OP1
:
345 TRACE ("BFD_RELOC_XTENSA_OP1");
346 return &elf_howto_table
[(unsigned) R_XTENSA_OP1
];
348 case BFD_RELOC_XTENSA_OP2
:
349 TRACE ("BFD_RELOC_XTENSA_OP2");
350 return &elf_howto_table
[(unsigned) R_XTENSA_OP2
];
352 case BFD_RELOC_XTENSA_ASM_EXPAND
:
353 TRACE ("BFD_RELOC_XTENSA_ASM_EXPAND");
354 return &elf_howto_table
[(unsigned) R_XTENSA_ASM_EXPAND
];
356 case BFD_RELOC_XTENSA_ASM_SIMPLIFY
:
357 TRACE ("BFD_RELOC_XTENSA_ASM_SIMPLIFY");
358 return &elf_howto_table
[(unsigned) R_XTENSA_ASM_SIMPLIFY
];
360 case BFD_RELOC_VTABLE_INHERIT
:
361 TRACE ("BFD_RELOC_VTABLE_INHERIT");
362 return &elf_howto_table
[(unsigned) R_XTENSA_GNU_VTINHERIT
];
364 case BFD_RELOC_VTABLE_ENTRY
:
365 TRACE ("BFD_RELOC_VTABLE_ENTRY");
366 return &elf_howto_table
[(unsigned) R_XTENSA_GNU_VTENTRY
];
369 if (code
>= BFD_RELOC_XTENSA_SLOT0_OP
370 && code
<= BFD_RELOC_XTENSA_SLOT14_OP
)
372 unsigned n
= (R_XTENSA_SLOT0_OP
+
373 (code
- BFD_RELOC_XTENSA_SLOT0_OP
));
374 return &elf_howto_table
[n
];
377 if (code
>= BFD_RELOC_XTENSA_SLOT0_ALT
378 && code
<= BFD_RELOC_XTENSA_SLOT14_ALT
)
380 unsigned n
= (R_XTENSA_SLOT0_ALT
+
381 (code
- BFD_RELOC_XTENSA_SLOT0_ALT
));
382 return &elf_howto_table
[n
];
393 /* Given an ELF "rela" relocation, find the corresponding howto and record
394 it in the BFD internal arelent representation of the relocation. */
397 elf_xtensa_info_to_howto_rela (bfd
*abfd ATTRIBUTE_UNUSED
,
399 Elf_Internal_Rela
*dst
)
401 unsigned int r_type
= ELF32_R_TYPE (dst
->r_info
);
403 BFD_ASSERT (r_type
< (unsigned int) R_XTENSA_max
);
404 cache_ptr
->howto
= &elf_howto_table
[r_type
];
408 /* Functions for the Xtensa ELF linker. */
410 /* The name of the dynamic interpreter. This is put in the .interp
413 #define ELF_DYNAMIC_INTERPRETER "/lib/ld.so"
415 /* The size in bytes of an entry in the procedure linkage table.
416 (This does _not_ include the space for the literals associated with
419 #define PLT_ENTRY_SIZE 16
421 /* For _really_ large PLTs, we may need to alternate between literals
422 and code to keep the literals within the 256K range of the L32R
423 instructions in the code. It's unlikely that anyone would ever need
424 such a big PLT, but an arbitrary limit on the PLT size would be bad.
425 Thus, we split the PLT into chunks. Since there's very little
426 overhead (2 extra literals) for each chunk, the chunk size is kept
427 small so that the code for handling multiple chunks get used and
428 tested regularly. With 254 entries, there are 1K of literals for
429 each chunk, and that seems like a nice round number. */
431 #define PLT_ENTRIES_PER_CHUNK 254
433 /* PLT entries are actually used as stub functions for lazy symbol
434 resolution. Once the symbol is resolved, the stub function is never
435 invoked. Note: the 32-byte frame size used here cannot be changed
436 without a corresponding change in the runtime linker. */
438 static const bfd_byte elf_xtensa_be_plt_entry
[PLT_ENTRY_SIZE
] =
440 0x6c, 0x10, 0x04, /* entry sp, 32 */
441 0x18, 0x00, 0x00, /* l32r a8, [got entry for rtld's resolver] */
442 0x1a, 0x00, 0x00, /* l32r a10, [got entry for rtld's link map] */
443 0x1b, 0x00, 0x00, /* l32r a11, [literal for reloc index] */
444 0x0a, 0x80, 0x00, /* jx a8 */
448 static const bfd_byte elf_xtensa_le_plt_entry
[PLT_ENTRY_SIZE
] =
450 0x36, 0x41, 0x00, /* entry sp, 32 */
451 0x81, 0x00, 0x00, /* l32r a8, [got entry for rtld's resolver] */
452 0xa1, 0x00, 0x00, /* l32r a10, [got entry for rtld's link map] */
453 0xb1, 0x00, 0x00, /* l32r a11, [literal for reloc index] */
454 0xa0, 0x08, 0x00, /* jx a8 */
458 /* Xtensa ELF linker hash table. */
460 struct elf_xtensa_link_hash_table
462 struct elf_link_hash_table elf
;
464 /* Short-cuts to get to dynamic linker sections. */
471 asection
*spltlittbl
;
473 /* Total count of PLT relocations seen during check_relocs.
474 The actual PLT code must be split into multiple sections and all
475 the sections have to be created before size_dynamic_sections,
476 where we figure out the exact number of PLT entries that will be
477 needed. It is OK if this count is an overestimate, e.g., some
478 relocations may be removed by GC. */
482 /* Get the Xtensa ELF linker hash table from a link_info structure. */
484 #define elf_xtensa_hash_table(p) \
485 ((struct elf_xtensa_link_hash_table *) ((p)->hash))
487 /* Create an Xtensa ELF linker hash table. */
489 static struct bfd_link_hash_table
*
490 elf_xtensa_link_hash_table_create (bfd
*abfd
)
492 struct elf_xtensa_link_hash_table
*ret
;
493 bfd_size_type amt
= sizeof (struct elf_xtensa_link_hash_table
);
495 ret
= bfd_malloc (amt
);
499 if (!_bfd_elf_link_hash_table_init (&ret
->elf
, abfd
,
500 _bfd_elf_link_hash_newfunc
,
501 sizeof (struct elf_link_hash_entry
)))
513 ret
->spltlittbl
= NULL
;
515 ret
->plt_reloc_count
= 0;
517 return &ret
->elf
.root
;
520 static inline bfd_boolean
521 elf_xtensa_dynamic_symbol_p (struct elf_link_hash_entry
*h
,
522 struct bfd_link_info
*info
)
524 /* Check if we should do dynamic things to this symbol. The
525 "ignore_protected" argument need not be set, because Xtensa code
526 does not require special handling of STV_PROTECTED to make function
527 pointer comparisons work properly. The PLT addresses are never
528 used for function pointers. */
530 return _bfd_elf_dynamic_symbol_p (h
, info
, 0);
535 property_table_compare (const void *ap
, const void *bp
)
537 const property_table_entry
*a
= (const property_table_entry
*) ap
;
538 const property_table_entry
*b
= (const property_table_entry
*) bp
;
540 if (a
->address
== b
->address
)
542 if (a
->size
!= b
->size
)
543 return (a
->size
- b
->size
);
545 if ((a
->flags
& XTENSA_PROP_ALIGN
) != (b
->flags
& XTENSA_PROP_ALIGN
))
546 return ((b
->flags
& XTENSA_PROP_ALIGN
)
547 - (a
->flags
& XTENSA_PROP_ALIGN
));
549 if ((a
->flags
& XTENSA_PROP_ALIGN
)
550 && (GET_XTENSA_PROP_ALIGNMENT (a
->flags
)
551 != GET_XTENSA_PROP_ALIGNMENT (b
->flags
)))
552 return (GET_XTENSA_PROP_ALIGNMENT (a
->flags
)
553 - GET_XTENSA_PROP_ALIGNMENT (b
->flags
));
555 if ((a
->flags
& XTENSA_PROP_UNREACHABLE
)
556 != (b
->flags
& XTENSA_PROP_UNREACHABLE
))
557 return ((b
->flags
& XTENSA_PROP_UNREACHABLE
)
558 - (a
->flags
& XTENSA_PROP_UNREACHABLE
));
560 return (a
->flags
- b
->flags
);
563 return (a
->address
- b
->address
);
568 property_table_matches (const void *ap
, const void *bp
)
570 const property_table_entry
*a
= (const property_table_entry
*) ap
;
571 const property_table_entry
*b
= (const property_table_entry
*) bp
;
573 /* Check if one entry overlaps with the other. */
574 if ((b
->address
>= a
->address
&& b
->address
< (a
->address
+ a
->size
))
575 || (a
->address
>= b
->address
&& a
->address
< (b
->address
+ b
->size
)))
578 return (a
->address
- b
->address
);
582 /* Get the literal table or property table entries for the given
583 section. Sets TABLE_P and returns the number of entries. On
584 error, returns a negative value. */
587 xtensa_read_table_entries (bfd
*abfd
,
589 property_table_entry
**table_p
,
590 const char *sec_name
,
591 bfd_boolean output_addr
)
593 asection
*table_section
;
594 bfd_size_type table_size
= 0;
595 bfd_byte
*table_data
;
596 property_table_entry
*blocks
;
597 int blk
, block_count
;
598 bfd_size_type num_records
;
599 Elf_Internal_Rela
*internal_relocs
;
600 bfd_vma section_addr
;
601 flagword predef_flags
;
602 bfd_size_type table_entry_size
;
605 || !(section
->flags
& SEC_ALLOC
)
606 || (section
->flags
& SEC_DEBUGGING
))
612 table_section
= xtensa_get_property_section (section
, sec_name
);
614 table_size
= table_section
->size
;
622 predef_flags
= xtensa_get_property_predef_flags (table_section
);
623 table_entry_size
= 12;
625 table_entry_size
-= 4;
627 num_records
= table_size
/ table_entry_size
;
628 table_data
= retrieve_contents (abfd
, table_section
, TRUE
);
629 blocks
= (property_table_entry
*)
630 bfd_malloc (num_records
* sizeof (property_table_entry
));
634 section_addr
= section
->output_section
->vma
+ section
->output_offset
;
636 section_addr
= section
->vma
;
638 /* If the file has not yet been relocated, process the relocations
639 and sort out the table entries that apply to the specified section. */
640 internal_relocs
= retrieve_internal_relocs (abfd
, table_section
, TRUE
);
641 if (internal_relocs
&& !table_section
->reloc_done
)
645 for (i
= 0; i
< table_section
->reloc_count
; i
++)
647 Elf_Internal_Rela
*rel
= &internal_relocs
[i
];
648 unsigned long r_symndx
;
650 if (ELF32_R_TYPE (rel
->r_info
) == R_XTENSA_NONE
)
653 BFD_ASSERT (ELF32_R_TYPE (rel
->r_info
) == R_XTENSA_32
);
654 r_symndx
= ELF32_R_SYM (rel
->r_info
);
656 if (get_elf_r_symndx_section (abfd
, r_symndx
) == section
)
658 bfd_vma sym_off
= get_elf_r_symndx_offset (abfd
, r_symndx
);
659 BFD_ASSERT (sym_off
== 0);
660 blocks
[block_count
].address
=
661 (section_addr
+ sym_off
+ rel
->r_addend
662 + bfd_get_32 (abfd
, table_data
+ rel
->r_offset
));
663 blocks
[block_count
].size
=
664 bfd_get_32 (abfd
, table_data
+ rel
->r_offset
+ 4);
666 blocks
[block_count
].flags
= predef_flags
;
668 blocks
[block_count
].flags
=
669 bfd_get_32 (abfd
, table_data
+ rel
->r_offset
+ 8);
676 /* The file has already been relocated and the addresses are
677 already in the table. */
679 bfd_size_type section_limit
= bfd_get_section_limit (abfd
, section
);
681 for (off
= 0; off
< table_size
; off
+= table_entry_size
)
683 bfd_vma address
= bfd_get_32 (abfd
, table_data
+ off
);
685 if (address
>= section_addr
686 && address
< section_addr
+ section_limit
)
688 blocks
[block_count
].address
= address
;
689 blocks
[block_count
].size
=
690 bfd_get_32 (abfd
, table_data
+ off
+ 4);
692 blocks
[block_count
].flags
= predef_flags
;
694 blocks
[block_count
].flags
=
695 bfd_get_32 (abfd
, table_data
+ off
+ 8);
701 release_contents (table_section
, table_data
);
702 release_internal_relocs (table_section
, internal_relocs
);
706 /* Now sort them into address order for easy reference. */
707 qsort (blocks
, block_count
, sizeof (property_table_entry
),
708 property_table_compare
);
710 /* Check that the table contents are valid. Problems may occur,
711 for example, if an unrelocated object file is stripped. */
712 for (blk
= 1; blk
< block_count
; blk
++)
714 /* The only circumstance where two entries may legitimately
715 have the same address is when one of them is a zero-size
716 placeholder to mark a place where fill can be inserted.
717 The zero-size entry should come first. */
718 if (blocks
[blk
- 1].address
== blocks
[blk
].address
&&
719 blocks
[blk
- 1].size
!= 0)
721 (*_bfd_error_handler
) (_("%B(%A): invalid property table"),
723 bfd_set_error (bfd_error_bad_value
);
735 static property_table_entry
*
736 elf_xtensa_find_property_entry (property_table_entry
*property_table
,
737 int property_table_size
,
740 property_table_entry entry
;
741 property_table_entry
*rv
;
743 if (property_table_size
== 0)
746 entry
.address
= addr
;
750 rv
= bsearch (&entry
, property_table
, property_table_size
,
751 sizeof (property_table_entry
), property_table_matches
);
757 elf_xtensa_in_literal_pool (property_table_entry
*lit_table
,
761 if (elf_xtensa_find_property_entry (lit_table
, lit_table_size
, addr
))
768 /* Look through the relocs for a section during the first phase, and
769 calculate needed space in the dynamic reloc sections. */
772 elf_xtensa_check_relocs (bfd
*abfd
,
773 struct bfd_link_info
*info
,
775 const Elf_Internal_Rela
*relocs
)
777 struct elf_xtensa_link_hash_table
*htab
;
778 Elf_Internal_Shdr
*symtab_hdr
;
779 struct elf_link_hash_entry
**sym_hashes
;
780 const Elf_Internal_Rela
*rel
;
781 const Elf_Internal_Rela
*rel_end
;
783 if (info
->relocatable
)
786 htab
= elf_xtensa_hash_table (info
);
787 symtab_hdr
= &elf_tdata (abfd
)->symtab_hdr
;
788 sym_hashes
= elf_sym_hashes (abfd
);
790 rel_end
= relocs
+ sec
->reloc_count
;
791 for (rel
= relocs
; rel
< rel_end
; rel
++)
794 unsigned long r_symndx
;
795 struct elf_link_hash_entry
*h
;
797 r_symndx
= ELF32_R_SYM (rel
->r_info
);
798 r_type
= ELF32_R_TYPE (rel
->r_info
);
800 if (r_symndx
>= NUM_SHDR_ENTRIES (symtab_hdr
))
802 (*_bfd_error_handler
) (_("%B: bad symbol index: %d"),
807 if (r_symndx
< symtab_hdr
->sh_info
)
811 h
= sym_hashes
[r_symndx
- symtab_hdr
->sh_info
];
812 while (h
->root
.type
== bfd_link_hash_indirect
813 || h
->root
.type
== bfd_link_hash_warning
)
814 h
= (struct elf_link_hash_entry
*) h
->root
.u
.i
.link
;
823 if ((sec
->flags
& SEC_ALLOC
) != 0)
825 if (h
->got
.refcount
<= 0)
828 h
->got
.refcount
+= 1;
833 /* If this relocation is against a local symbol, then it's
834 exactly the same as a normal local GOT entry. */
838 if ((sec
->flags
& SEC_ALLOC
) != 0)
840 if (h
->plt
.refcount
<= 0)
846 h
->plt
.refcount
+= 1;
848 /* Keep track of the total PLT relocation count even if we
849 don't yet know whether the dynamic sections will be
851 htab
->plt_reloc_count
+= 1;
853 if (elf_hash_table (info
)->dynamic_sections_created
)
855 if (! add_extra_plt_sections (info
, htab
->plt_reloc_count
))
862 if ((sec
->flags
& SEC_ALLOC
) != 0)
864 bfd_signed_vma
*local_got_refcounts
;
866 /* This is a global offset table entry for a local symbol. */
867 local_got_refcounts
= elf_local_got_refcounts (abfd
);
868 if (local_got_refcounts
== NULL
)
872 size
= symtab_hdr
->sh_info
;
873 size
*= sizeof (bfd_signed_vma
);
874 local_got_refcounts
=
875 (bfd_signed_vma
*) bfd_zalloc (abfd
, size
);
876 if (local_got_refcounts
== NULL
)
878 elf_local_got_refcounts (abfd
) = local_got_refcounts
;
880 local_got_refcounts
[r_symndx
] += 1;
887 case R_XTENSA_SLOT0_OP
:
888 case R_XTENSA_SLOT1_OP
:
889 case R_XTENSA_SLOT2_OP
:
890 case R_XTENSA_SLOT3_OP
:
891 case R_XTENSA_SLOT4_OP
:
892 case R_XTENSA_SLOT5_OP
:
893 case R_XTENSA_SLOT6_OP
:
894 case R_XTENSA_SLOT7_OP
:
895 case R_XTENSA_SLOT8_OP
:
896 case R_XTENSA_SLOT9_OP
:
897 case R_XTENSA_SLOT10_OP
:
898 case R_XTENSA_SLOT11_OP
:
899 case R_XTENSA_SLOT12_OP
:
900 case R_XTENSA_SLOT13_OP
:
901 case R_XTENSA_SLOT14_OP
:
902 case R_XTENSA_SLOT0_ALT
:
903 case R_XTENSA_SLOT1_ALT
:
904 case R_XTENSA_SLOT2_ALT
:
905 case R_XTENSA_SLOT3_ALT
:
906 case R_XTENSA_SLOT4_ALT
:
907 case R_XTENSA_SLOT5_ALT
:
908 case R_XTENSA_SLOT6_ALT
:
909 case R_XTENSA_SLOT7_ALT
:
910 case R_XTENSA_SLOT8_ALT
:
911 case R_XTENSA_SLOT9_ALT
:
912 case R_XTENSA_SLOT10_ALT
:
913 case R_XTENSA_SLOT11_ALT
:
914 case R_XTENSA_SLOT12_ALT
:
915 case R_XTENSA_SLOT13_ALT
:
916 case R_XTENSA_SLOT14_ALT
:
917 case R_XTENSA_ASM_EXPAND
:
918 case R_XTENSA_ASM_SIMPLIFY
:
920 case R_XTENSA_DIFF16
:
921 case R_XTENSA_DIFF32
:
922 /* Nothing to do for these. */
925 case R_XTENSA_GNU_VTINHERIT
:
926 /* This relocation describes the C++ object vtable hierarchy.
927 Reconstruct it for later use during GC. */
928 if (!bfd_elf_gc_record_vtinherit (abfd
, sec
, h
, rel
->r_offset
))
932 case R_XTENSA_GNU_VTENTRY
:
933 /* This relocation describes which C++ vtable entries are actually
934 used. Record for later use during GC. */
935 if (!bfd_elf_gc_record_vtentry (abfd
, sec
, h
, rel
->r_addend
))
948 /* Return the section that should be marked against GC for a given
952 elf_xtensa_gc_mark_hook (asection
*sec
,
953 struct bfd_link_info
*info
,
954 Elf_Internal_Rela
*rel
,
955 struct elf_link_hash_entry
*h
,
956 Elf_Internal_Sym
*sym
)
959 switch (ELF32_R_TYPE (rel
->r_info
))
961 case R_XTENSA_GNU_VTINHERIT
:
962 case R_XTENSA_GNU_VTENTRY
:
966 return _bfd_elf_gc_mark_hook (sec
, info
, rel
, h
, sym
);
970 /* Update the GOT & PLT entry reference counts
971 for the section being removed. */
974 elf_xtensa_gc_sweep_hook (bfd
*abfd
,
975 struct bfd_link_info
*info ATTRIBUTE_UNUSED
,
977 const Elf_Internal_Rela
*relocs
)
979 Elf_Internal_Shdr
*symtab_hdr
;
980 struct elf_link_hash_entry
**sym_hashes
;
981 bfd_signed_vma
*local_got_refcounts
;
982 const Elf_Internal_Rela
*rel
, *relend
;
984 if ((sec
->flags
& SEC_ALLOC
) == 0)
987 symtab_hdr
= &elf_tdata (abfd
)->symtab_hdr
;
988 sym_hashes
= elf_sym_hashes (abfd
);
989 local_got_refcounts
= elf_local_got_refcounts (abfd
);
991 relend
= relocs
+ sec
->reloc_count
;
992 for (rel
= relocs
; rel
< relend
; rel
++)
994 unsigned long r_symndx
;
996 struct elf_link_hash_entry
*h
= NULL
;
998 r_symndx
= ELF32_R_SYM (rel
->r_info
);
999 if (r_symndx
>= symtab_hdr
->sh_info
)
1001 h
= sym_hashes
[r_symndx
- symtab_hdr
->sh_info
];
1002 while (h
->root
.type
== bfd_link_hash_indirect
1003 || h
->root
.type
== bfd_link_hash_warning
)
1004 h
= (struct elf_link_hash_entry
*) h
->root
.u
.i
.link
;
1007 r_type
= ELF32_R_TYPE (rel
->r_info
);
1013 if (h
->got
.refcount
> 0)
1020 if (h
->plt
.refcount
> 0)
1025 if (local_got_refcounts
[r_symndx
] > 0)
1026 local_got_refcounts
[r_symndx
] -= 1;
1038 /* Create all the dynamic sections. */
1041 elf_xtensa_create_dynamic_sections (bfd
*dynobj
, struct bfd_link_info
*info
)
1043 struct elf_xtensa_link_hash_table
*htab
;
1044 flagword flags
, noalloc_flags
;
1046 htab
= elf_xtensa_hash_table (info
);
1048 /* First do all the standard stuff. */
1049 if (! _bfd_elf_create_dynamic_sections (dynobj
, info
))
1051 htab
->splt
= bfd_get_section_by_name (dynobj
, ".plt");
1052 htab
->srelplt
= bfd_get_section_by_name (dynobj
, ".rela.plt");
1053 htab
->sgot
= bfd_get_section_by_name (dynobj
, ".got");
1054 htab
->sgotplt
= bfd_get_section_by_name (dynobj
, ".got.plt");
1056 /* Create any extra PLT sections in case check_relocs has already
1057 been called on all the non-dynamic input files. */
1058 if (! add_extra_plt_sections (info
, htab
->plt_reloc_count
))
1061 noalloc_flags
= (SEC_HAS_CONTENTS
| SEC_IN_MEMORY
1062 | SEC_LINKER_CREATED
| SEC_READONLY
);
1063 flags
= noalloc_flags
| SEC_ALLOC
| SEC_LOAD
;
1065 /* Mark the ".got.plt" section READONLY. */
1066 if (htab
->sgotplt
== NULL
1067 || ! bfd_set_section_flags (dynobj
, htab
->sgotplt
, flags
))
1070 /* Create ".rela.got". */
1071 htab
->srelgot
= bfd_make_section_with_flags (dynobj
, ".rela.got", flags
);
1072 if (htab
->srelgot
== NULL
1073 || ! bfd_set_section_alignment (dynobj
, htab
->srelgot
, 2))
1076 /* Create ".got.loc" (literal tables for use by dynamic linker). */
1077 htab
->sgotloc
= bfd_make_section_with_flags (dynobj
, ".got.loc", flags
);
1078 if (htab
->sgotloc
== NULL
1079 || ! bfd_set_section_alignment (dynobj
, htab
->sgotloc
, 2))
1082 /* Create ".xt.lit.plt" (literal table for ".got.plt*"). */
1083 htab
->spltlittbl
= bfd_make_section_with_flags (dynobj
, ".xt.lit.plt",
1085 if (htab
->spltlittbl
== NULL
1086 || ! bfd_set_section_alignment (dynobj
, htab
->spltlittbl
, 2))
1094 add_extra_plt_sections (struct bfd_link_info
*info
, int count
)
1096 bfd
*dynobj
= elf_hash_table (info
)->dynobj
;
1099 /* Iterate over all chunks except 0 which uses the standard ".plt" and
1100 ".got.plt" sections. */
1101 for (chunk
= count
/ PLT_ENTRIES_PER_CHUNK
; chunk
> 0; chunk
--)
1107 /* Stop when we find a section has already been created. */
1108 if (elf_xtensa_get_plt_section (info
, chunk
))
1111 flags
= (SEC_ALLOC
| SEC_LOAD
| SEC_HAS_CONTENTS
| SEC_IN_MEMORY
1112 | SEC_LINKER_CREATED
| SEC_READONLY
);
1114 sname
= (char *) bfd_malloc (10);
1115 sprintf (sname
, ".plt.%u", chunk
);
1116 s
= bfd_make_section_with_flags (dynobj
, sname
, flags
| SEC_CODE
);
1118 || ! bfd_set_section_alignment (dynobj
, s
, 2))
1121 sname
= (char *) bfd_malloc (14);
1122 sprintf (sname
, ".got.plt.%u", chunk
);
1123 s
= bfd_make_section_with_flags (dynobj
, sname
, flags
);
1125 || ! bfd_set_section_alignment (dynobj
, s
, 2))
1133 /* Adjust a symbol defined by a dynamic object and referenced by a
1134 regular object. The current definition is in some section of the
1135 dynamic object, but we're not including those sections. We have to
1136 change the definition to something the rest of the link can
1140 elf_xtensa_adjust_dynamic_symbol (struct bfd_link_info
*info ATTRIBUTE_UNUSED
,
1141 struct elf_link_hash_entry
*h
)
1143 /* If this is a weak symbol, and there is a real definition, the
1144 processor independent code will have arranged for us to see the
1145 real definition first, and we can just use the same value. */
1148 BFD_ASSERT (h
->u
.weakdef
->root
.type
== bfd_link_hash_defined
1149 || h
->u
.weakdef
->root
.type
== bfd_link_hash_defweak
);
1150 h
->root
.u
.def
.section
= h
->u
.weakdef
->root
.u
.def
.section
;
1151 h
->root
.u
.def
.value
= h
->u
.weakdef
->root
.u
.def
.value
;
1155 /* This is a reference to a symbol defined by a dynamic object. The
1156 reference must go through the GOT, so there's no need for COPY relocs,
1164 elf_xtensa_allocate_dynrelocs (struct elf_link_hash_entry
*h
, void *arg
)
1166 struct bfd_link_info
*info
;
1167 struct elf_xtensa_link_hash_table
*htab
;
1168 bfd_boolean is_dynamic
;
1170 if (h
->root
.type
== bfd_link_hash_indirect
)
1173 if (h
->root
.type
== bfd_link_hash_warning
)
1174 h
= (struct elf_link_hash_entry
*) h
->root
.u
.i
.link
;
1176 info
= (struct bfd_link_info
*) arg
;
1177 htab
= elf_xtensa_hash_table (info
);
1179 is_dynamic
= elf_xtensa_dynamic_symbol_p (h
, info
);
1185 /* For shared objects, there's no need for PLT entries for local
1186 symbols (use RELATIVE relocs instead of JMP_SLOT relocs). */
1187 if (h
->plt
.refcount
> 0)
1189 if (h
->got
.refcount
< 0)
1190 h
->got
.refcount
= 0;
1191 h
->got
.refcount
+= h
->plt
.refcount
;
1192 h
->plt
.refcount
= 0;
1197 /* Don't need any dynamic relocations at all. */
1198 h
->plt
.refcount
= 0;
1199 h
->got
.refcount
= 0;
1203 if (h
->plt
.refcount
> 0)
1204 htab
->srelplt
->size
+= (h
->plt
.refcount
* sizeof (Elf32_External_Rela
));
1206 if (h
->got
.refcount
> 0)
1207 htab
->srelgot
->size
+= (h
->got
.refcount
* sizeof (Elf32_External_Rela
));
1214 elf_xtensa_allocate_local_got_size (struct bfd_link_info
*info
)
1216 struct elf_xtensa_link_hash_table
*htab
;
1219 htab
= elf_xtensa_hash_table (info
);
1221 for (i
= info
->input_bfds
; i
; i
= i
->link_next
)
1223 bfd_signed_vma
*local_got_refcounts
;
1224 bfd_size_type j
, cnt
;
1225 Elf_Internal_Shdr
*symtab_hdr
;
1227 local_got_refcounts
= elf_local_got_refcounts (i
);
1228 if (!local_got_refcounts
)
1231 symtab_hdr
= &elf_tdata (i
)->symtab_hdr
;
1232 cnt
= symtab_hdr
->sh_info
;
1234 for (j
= 0; j
< cnt
; ++j
)
1236 if (local_got_refcounts
[j
] > 0)
1237 htab
->srelgot
->size
+= (local_got_refcounts
[j
]
1238 * sizeof (Elf32_External_Rela
));
1244 /* Set the sizes of the dynamic sections. */
1247 elf_xtensa_size_dynamic_sections (bfd
*output_bfd ATTRIBUTE_UNUSED
,
1248 struct bfd_link_info
*info
)
1250 struct elf_xtensa_link_hash_table
*htab
;
1252 asection
*s
, *srelplt
, *splt
, *sgotplt
, *srelgot
, *spltlittbl
, *sgotloc
;
1253 bfd_boolean relplt
, relgot
;
1254 int plt_entries
, plt_chunks
, chunk
;
1259 htab
= elf_xtensa_hash_table (info
);
1260 dynobj
= elf_hash_table (info
)->dynobj
;
1263 srelgot
= htab
->srelgot
;
1264 srelplt
= htab
->srelplt
;
1266 if (elf_hash_table (info
)->dynamic_sections_created
)
1268 BFD_ASSERT (htab
->srelgot
!= NULL
1269 && htab
->srelplt
!= NULL
1270 && htab
->sgot
!= NULL
1271 && htab
->spltlittbl
!= NULL
1272 && htab
->sgotloc
!= NULL
);
1274 /* Set the contents of the .interp section to the interpreter. */
1275 if (info
->executable
)
1277 s
= bfd_get_section_by_name (dynobj
, ".interp");
1280 s
->size
= sizeof ELF_DYNAMIC_INTERPRETER
;
1281 s
->contents
= (unsigned char *) ELF_DYNAMIC_INTERPRETER
;
1284 /* Allocate room for one word in ".got". */
1285 htab
->sgot
->size
= 4;
1287 /* Allocate space in ".rela.got" for literals that reference global
1288 symbols and space in ".rela.plt" for literals that have PLT
1290 elf_link_hash_traverse (elf_hash_table (info
),
1291 elf_xtensa_allocate_dynrelocs
,
1294 /* If we are generating a shared object, we also need space in
1295 ".rela.got" for R_XTENSA_RELATIVE relocs for literals that
1296 reference local symbols. */
1298 elf_xtensa_allocate_local_got_size (info
);
1300 /* Allocate space in ".plt" to match the size of ".rela.plt". For
1301 each PLT entry, we need the PLT code plus a 4-byte literal.
1302 For each chunk of ".plt", we also need two more 4-byte
1303 literals, two corresponding entries in ".rela.got", and an
1304 8-byte entry in ".xt.lit.plt". */
1305 spltlittbl
= htab
->spltlittbl
;
1306 plt_entries
= srelplt
->size
/ sizeof (Elf32_External_Rela
);
1308 (plt_entries
+ PLT_ENTRIES_PER_CHUNK
- 1) / PLT_ENTRIES_PER_CHUNK
;
1310 /* Iterate over all the PLT chunks, including any extra sections
1311 created earlier because the initial count of PLT relocations
1312 was an overestimate. */
1314 (splt
= elf_xtensa_get_plt_section (info
, chunk
)) != NULL
;
1319 sgotplt
= elf_xtensa_get_gotplt_section (info
, chunk
);
1320 BFD_ASSERT (sgotplt
!= NULL
);
1322 if (chunk
< plt_chunks
- 1)
1323 chunk_entries
= PLT_ENTRIES_PER_CHUNK
;
1324 else if (chunk
== plt_chunks
- 1)
1325 chunk_entries
= plt_entries
- (chunk
* PLT_ENTRIES_PER_CHUNK
);
1329 if (chunk_entries
!= 0)
1331 sgotplt
->size
= 4 * (chunk_entries
+ 2);
1332 splt
->size
= PLT_ENTRY_SIZE
* chunk_entries
;
1333 srelgot
->size
+= 2 * sizeof (Elf32_External_Rela
);
1334 spltlittbl
->size
+= 8;
1343 /* Allocate space in ".got.loc" to match the total size of all the
1345 sgotloc
= htab
->sgotloc
;
1346 sgotloc
->size
= spltlittbl
->size
;
1347 for (abfd
= info
->input_bfds
; abfd
!= NULL
; abfd
= abfd
->link_next
)
1349 if (abfd
->flags
& DYNAMIC
)
1351 for (s
= abfd
->sections
; s
!= NULL
; s
= s
->next
)
1353 if (! elf_discarded_section (s
)
1354 && xtensa_is_littable_section (s
)
1356 sgotloc
->size
+= s
->size
;
1361 /* Allocate memory for dynamic sections. */
1364 for (s
= dynobj
->sections
; s
!= NULL
; s
= s
->next
)
1368 if ((s
->flags
& SEC_LINKER_CREATED
) == 0)
1371 /* It's OK to base decisions on the section name, because none
1372 of the dynobj section names depend upon the input files. */
1373 name
= bfd_get_section_name (dynobj
, s
);
1375 if (CONST_STRNEQ (name
, ".rela"))
1379 if (strcmp (name
, ".rela.plt") == 0)
1381 else if (strcmp (name
, ".rela.got") == 0)
1384 /* We use the reloc_count field as a counter if we need
1385 to copy relocs into the output file. */
1389 else if (! CONST_STRNEQ (name
, ".plt.")
1390 && ! CONST_STRNEQ (name
, ".got.plt.")
1391 && strcmp (name
, ".got") != 0
1392 && strcmp (name
, ".plt") != 0
1393 && strcmp (name
, ".got.plt") != 0
1394 && strcmp (name
, ".xt.lit.plt") != 0
1395 && strcmp (name
, ".got.loc") != 0)
1397 /* It's not one of our sections, so don't allocate space. */
1403 /* If we don't need this section, strip it from the output
1404 file. We must create the ".plt*" and ".got.plt*"
1405 sections in create_dynamic_sections and/or check_relocs
1406 based on a conservative estimate of the PLT relocation
1407 count, because the sections must be created before the
1408 linker maps input sections to output sections. The
1409 linker does that before size_dynamic_sections, where we
1410 compute the exact size of the PLT, so there may be more
1411 of these sections than are actually needed. */
1412 s
->flags
|= SEC_EXCLUDE
;
1414 else if ((s
->flags
& SEC_HAS_CONTENTS
) != 0)
1416 /* Allocate memory for the section contents. */
1417 s
->contents
= (bfd_byte
*) bfd_zalloc (dynobj
, s
->size
);
1418 if (s
->contents
== NULL
)
1423 if (elf_hash_table (info
)->dynamic_sections_created
)
1425 /* Add the special XTENSA_RTLD relocations now. The offsets won't be
1426 known until finish_dynamic_sections, but we need to get the relocs
1427 in place before they are sorted. */
1428 for (chunk
= 0; chunk
< plt_chunks
; chunk
++)
1430 Elf_Internal_Rela irela
;
1434 irela
.r_info
= ELF32_R_INFO (0, R_XTENSA_RTLD
);
1437 loc
= (srelgot
->contents
1438 + srelgot
->reloc_count
* sizeof (Elf32_External_Rela
));
1439 bfd_elf32_swap_reloca_out (output_bfd
, &irela
, loc
);
1440 bfd_elf32_swap_reloca_out (output_bfd
, &irela
,
1441 loc
+ sizeof (Elf32_External_Rela
));
1442 srelgot
->reloc_count
+= 2;
1445 /* Add some entries to the .dynamic section. We fill in the
1446 values later, in elf_xtensa_finish_dynamic_sections, but we
1447 must add the entries now so that we get the correct size for
1448 the .dynamic section. The DT_DEBUG entry is filled in by the
1449 dynamic linker and used by the debugger. */
1450 #define add_dynamic_entry(TAG, VAL) \
1451 _bfd_elf_add_dynamic_entry (info, TAG, VAL)
1453 if (info
->executable
)
1455 if (!add_dynamic_entry (DT_DEBUG
, 0))
1461 if (!add_dynamic_entry (DT_PLTGOT
, 0)
1462 || !add_dynamic_entry (DT_PLTRELSZ
, 0)
1463 || !add_dynamic_entry (DT_PLTREL
, DT_RELA
)
1464 || !add_dynamic_entry (DT_JMPREL
, 0))
1470 if (!add_dynamic_entry (DT_RELA
, 0)
1471 || !add_dynamic_entry (DT_RELASZ
, 0)
1472 || !add_dynamic_entry (DT_RELAENT
, sizeof (Elf32_External_Rela
)))
1476 if (!add_dynamic_entry (DT_XTENSA_GOT_LOC_OFF
, 0)
1477 || !add_dynamic_entry (DT_XTENSA_GOT_LOC_SZ
, 0))
1480 #undef add_dynamic_entry
1486 /* Perform the specified relocation. The instruction at (contents + address)
1487 is modified to set one operand to represent the value in "relocation". The
1488 operand position is determined by the relocation type recorded in the
1491 #define CALL_SEGMENT_BITS (30)
1492 #define CALL_SEGMENT_SIZE (1 << CALL_SEGMENT_BITS)
1494 static bfd_reloc_status_type
1495 elf_xtensa_do_reloc (reloc_howto_type
*howto
,
1497 asection
*input_section
,
1501 bfd_boolean is_weak_undef
,
1502 char **error_message
)
1505 xtensa_opcode opcode
;
1506 xtensa_isa isa
= xtensa_default_isa
;
1507 static xtensa_insnbuf ibuff
= NULL
;
1508 static xtensa_insnbuf sbuff
= NULL
;
1509 bfd_vma self_address
= 0;
1510 bfd_size_type input_size
;
1516 ibuff
= xtensa_insnbuf_alloc (isa
);
1517 sbuff
= xtensa_insnbuf_alloc (isa
);
1520 input_size
= bfd_get_section_limit (abfd
, input_section
);
1522 switch (howto
->type
)
1525 case R_XTENSA_DIFF8
:
1526 case R_XTENSA_DIFF16
:
1527 case R_XTENSA_DIFF32
:
1528 return bfd_reloc_ok
;
1530 case R_XTENSA_ASM_EXPAND
:
1533 /* Check for windowed CALL across a 1GB boundary. */
1534 xtensa_opcode opcode
=
1535 get_expanded_call_opcode (contents
+ address
,
1536 input_size
- address
, 0);
1537 if (is_windowed_call_opcode (opcode
))
1539 self_address
= (input_section
->output_section
->vma
1540 + input_section
->output_offset
1542 if ((self_address
>> CALL_SEGMENT_BITS
)
1543 != (relocation
>> CALL_SEGMENT_BITS
))
1545 *error_message
= "windowed longcall crosses 1GB boundary; "
1547 return bfd_reloc_dangerous
;
1551 return bfd_reloc_ok
;
1553 case R_XTENSA_ASM_SIMPLIFY
:
1555 /* Convert the L32R/CALLX to CALL. */
1556 bfd_reloc_status_type retval
=
1557 elf_xtensa_do_asm_simplify (contents
, address
, input_size
,
1559 if (retval
!= bfd_reloc_ok
)
1560 return bfd_reloc_dangerous
;
1562 /* The CALL needs to be relocated. Continue below for that part. */
1564 howto
= &elf_howto_table
[(unsigned) R_XTENSA_SLOT0_OP
];
1572 x
= bfd_get_32 (abfd
, contents
+ address
);
1574 bfd_put_32 (abfd
, x
, contents
+ address
);
1576 return bfd_reloc_ok
;
1579 /* Only instruction slot-specific relocations handled below.... */
1580 slot
= get_relocation_slot (howto
->type
);
1581 if (slot
== XTENSA_UNDEFINED
)
1583 *error_message
= "unexpected relocation";
1584 return bfd_reloc_dangerous
;
1587 /* Read the instruction into a buffer and decode the opcode. */
1588 xtensa_insnbuf_from_chars (isa
, ibuff
, contents
+ address
,
1589 input_size
- address
);
1590 fmt
= xtensa_format_decode (isa
, ibuff
);
1591 if (fmt
== XTENSA_UNDEFINED
)
1593 *error_message
= "cannot decode instruction format";
1594 return bfd_reloc_dangerous
;
1597 xtensa_format_get_slot (isa
, fmt
, slot
, ibuff
, sbuff
);
1599 opcode
= xtensa_opcode_decode (isa
, fmt
, slot
, sbuff
);
1600 if (opcode
== XTENSA_UNDEFINED
)
1602 *error_message
= "cannot decode instruction opcode";
1603 return bfd_reloc_dangerous
;
1606 /* Check for opcode-specific "alternate" relocations. */
1607 if (is_alt_relocation (howto
->type
))
1609 if (opcode
== get_l32r_opcode ())
1611 /* Handle the special-case of non-PC-relative L32R instructions. */
1612 bfd
*output_bfd
= input_section
->output_section
->owner
;
1613 asection
*lit4_sec
= bfd_get_section_by_name (output_bfd
, ".lit4");
1616 *error_message
= "relocation references missing .lit4 section";
1617 return bfd_reloc_dangerous
;
1619 self_address
= ((lit4_sec
->vma
& ~0xfff)
1620 + 0x40000 - 3); /* -3 to compensate for do_reloc */
1621 newval
= relocation
;
1624 else if (opcode
== get_const16_opcode ())
1626 /* ALT used for high 16 bits. */
1627 newval
= relocation
>> 16;
1632 /* No other "alternate" relocations currently defined. */
1633 *error_message
= "unexpected relocation";
1634 return bfd_reloc_dangerous
;
1637 else /* Not an "alternate" relocation.... */
1639 if (opcode
== get_const16_opcode ())
1641 newval
= relocation
& 0xffff;
1646 /* ...normal PC-relative relocation.... */
1648 /* Determine which operand is being relocated. */
1649 opnd
= get_relocation_opnd (opcode
, howto
->type
);
1650 if (opnd
== XTENSA_UNDEFINED
)
1652 *error_message
= "unexpected relocation";
1653 return bfd_reloc_dangerous
;
1656 if (!howto
->pc_relative
)
1658 *error_message
= "expected PC-relative relocation";
1659 return bfd_reloc_dangerous
;
1662 /* Calculate the PC address for this instruction. */
1663 self_address
= (input_section
->output_section
->vma
1664 + input_section
->output_offset
1667 newval
= relocation
;
1671 /* Apply the relocation. */
1672 if (xtensa_operand_do_reloc (isa
, opcode
, opnd
, &newval
, self_address
)
1673 || xtensa_operand_encode (isa
, opcode
, opnd
, &newval
)
1674 || xtensa_operand_set_field (isa
, opcode
, opnd
, fmt
, slot
,
1677 const char *opname
= xtensa_opcode_name (isa
, opcode
);
1680 msg
= "cannot encode";
1681 if (is_direct_call_opcode (opcode
))
1683 if ((relocation
& 0x3) != 0)
1684 msg
= "misaligned call target";
1686 msg
= "call target out of range";
1688 else if (opcode
== get_l32r_opcode ())
1690 if ((relocation
& 0x3) != 0)
1691 msg
= "misaligned literal target";
1692 else if (is_alt_relocation (howto
->type
))
1693 msg
= "literal target out of range (too many literals)";
1694 else if (self_address
> relocation
)
1695 msg
= "literal target out of range (try using text-section-literals)";
1697 msg
= "literal placed after use";
1700 *error_message
= vsprint_msg (opname
, ": %s", strlen (msg
) + 2, msg
);
1701 return bfd_reloc_dangerous
;
1704 /* Check for calls across 1GB boundaries. */
1705 if (is_direct_call_opcode (opcode
)
1706 && is_windowed_call_opcode (opcode
))
1708 if ((self_address
>> CALL_SEGMENT_BITS
)
1709 != (relocation
>> CALL_SEGMENT_BITS
))
1712 "windowed call crosses 1GB boundary; return may fail";
1713 return bfd_reloc_dangerous
;
1717 /* Write the modified instruction back out of the buffer. */
1718 xtensa_format_set_slot (isa
, fmt
, slot
, ibuff
, sbuff
);
1719 xtensa_insnbuf_to_chars (isa
, ibuff
, contents
+ address
,
1720 input_size
- address
);
1721 return bfd_reloc_ok
;
1726 vsprint_msg (const char *origmsg
, const char *fmt
, int arglen
, ...)
1728 /* To reduce the size of the memory leak,
1729 we only use a single message buffer. */
1730 static bfd_size_type alloc_size
= 0;
1731 static char *message
= NULL
;
1732 bfd_size_type orig_len
, len
= 0;
1733 bfd_boolean is_append
;
1735 VA_OPEN (ap
, arglen
);
1736 VA_FIXEDARG (ap
, const char *, origmsg
);
1738 is_append
= (origmsg
== message
);
1740 orig_len
= strlen (origmsg
);
1741 len
= orig_len
+ strlen (fmt
) + arglen
+ 20;
1742 if (len
> alloc_size
)
1744 message
= (char *) bfd_realloc (message
, len
);
1748 memcpy (message
, origmsg
, orig_len
);
1749 vsprintf (message
+ orig_len
, fmt
, ap
);
1755 /* This function is registered as the "special_function" in the
1756 Xtensa howto for handling simplify operations.
1757 bfd_perform_relocation / bfd_install_relocation use it to
1758 perform (install) the specified relocation. Since this replaces the code
1759 in bfd_perform_relocation, it is basically an Xtensa-specific,
1760 stripped-down version of bfd_perform_relocation. */
1762 static bfd_reloc_status_type
1763 bfd_elf_xtensa_reloc (bfd
*abfd
,
1764 arelent
*reloc_entry
,
1767 asection
*input_section
,
1769 char **error_message
)
1772 bfd_reloc_status_type flag
;
1773 bfd_size_type octets
= reloc_entry
->address
* bfd_octets_per_byte (abfd
);
1774 bfd_vma output_base
= 0;
1775 reloc_howto_type
*howto
= reloc_entry
->howto
;
1776 asection
*reloc_target_output_section
;
1777 bfd_boolean is_weak_undef
;
1779 if (!xtensa_default_isa
)
1780 xtensa_default_isa
= xtensa_isa_init (0, 0);
1782 /* ELF relocs are against symbols. If we are producing relocatable
1783 output, and the reloc is against an external symbol, the resulting
1784 reloc will also be against the same symbol. In such a case, we
1785 don't want to change anything about the way the reloc is handled,
1786 since it will all be done at final link time. This test is similar
1787 to what bfd_elf_generic_reloc does except that it lets relocs with
1788 howto->partial_inplace go through even if the addend is non-zero.
1789 (The real problem is that partial_inplace is set for XTENSA_32
1790 relocs to begin with, but that's a long story and there's little we
1791 can do about it now....) */
1793 if (output_bfd
&& (symbol
->flags
& BSF_SECTION_SYM
) == 0)
1795 reloc_entry
->address
+= input_section
->output_offset
;
1796 return bfd_reloc_ok
;
1799 /* Is the address of the relocation really within the section? */
1800 if (reloc_entry
->address
> bfd_get_section_limit (abfd
, input_section
))
1801 return bfd_reloc_outofrange
;
1803 /* Work out which section the relocation is targeted at and the
1804 initial relocation command value. */
1806 /* Get symbol value. (Common symbols are special.) */
1807 if (bfd_is_com_section (symbol
->section
))
1810 relocation
= symbol
->value
;
1812 reloc_target_output_section
= symbol
->section
->output_section
;
1814 /* Convert input-section-relative symbol value to absolute. */
1815 if ((output_bfd
&& !howto
->partial_inplace
)
1816 || reloc_target_output_section
== NULL
)
1819 output_base
= reloc_target_output_section
->vma
;
1821 relocation
+= output_base
+ symbol
->section
->output_offset
;
1823 /* Add in supplied addend. */
1824 relocation
+= reloc_entry
->addend
;
1826 /* Here the variable relocation holds the final address of the
1827 symbol we are relocating against, plus any addend. */
1830 if (!howto
->partial_inplace
)
1832 /* This is a partial relocation, and we want to apply the relocation
1833 to the reloc entry rather than the raw data. Everything except
1834 relocations against section symbols has already been handled
1837 BFD_ASSERT (symbol
->flags
& BSF_SECTION_SYM
);
1838 reloc_entry
->addend
= relocation
;
1839 reloc_entry
->address
+= input_section
->output_offset
;
1840 return bfd_reloc_ok
;
1844 reloc_entry
->address
+= input_section
->output_offset
;
1845 reloc_entry
->addend
= 0;
1849 is_weak_undef
= (bfd_is_und_section (symbol
->section
)
1850 && (symbol
->flags
& BSF_WEAK
) != 0);
1851 flag
= elf_xtensa_do_reloc (howto
, abfd
, input_section
, relocation
,
1852 (bfd_byte
*) data
, (bfd_vma
) octets
,
1853 is_weak_undef
, error_message
);
1855 if (flag
== bfd_reloc_dangerous
)
1857 /* Add the symbol name to the error message. */
1858 if (! *error_message
)
1859 *error_message
= "";
1860 *error_message
= vsprint_msg (*error_message
, ": (%s + 0x%lx)",
1861 strlen (symbol
->name
) + 17,
1863 (unsigned long) reloc_entry
->addend
);
1870 /* Set up an entry in the procedure linkage table. */
1873 elf_xtensa_create_plt_entry (struct bfd_link_info
*info
,
1875 unsigned reloc_index
)
1877 asection
*splt
, *sgotplt
;
1878 bfd_vma plt_base
, got_base
;
1879 bfd_vma code_offset
, lit_offset
;
1882 chunk
= reloc_index
/ PLT_ENTRIES_PER_CHUNK
;
1883 splt
= elf_xtensa_get_plt_section (info
, chunk
);
1884 sgotplt
= elf_xtensa_get_gotplt_section (info
, chunk
);
1885 BFD_ASSERT (splt
!= NULL
&& sgotplt
!= NULL
);
1887 plt_base
= splt
->output_section
->vma
+ splt
->output_offset
;
1888 got_base
= sgotplt
->output_section
->vma
+ sgotplt
->output_offset
;
1890 lit_offset
= 8 + (reloc_index
% PLT_ENTRIES_PER_CHUNK
) * 4;
1891 code_offset
= (reloc_index
% PLT_ENTRIES_PER_CHUNK
) * PLT_ENTRY_SIZE
;
1893 /* Fill in the literal entry. This is the offset of the dynamic
1894 relocation entry. */
1895 bfd_put_32 (output_bfd
, reloc_index
* sizeof (Elf32_External_Rela
),
1896 sgotplt
->contents
+ lit_offset
);
1898 /* Fill in the entry in the procedure linkage table. */
1899 memcpy (splt
->contents
+ code_offset
,
1900 (bfd_big_endian (output_bfd
)
1901 ? elf_xtensa_be_plt_entry
1902 : elf_xtensa_le_plt_entry
),
1904 bfd_put_16 (output_bfd
, l32r_offset (got_base
+ 0,
1905 plt_base
+ code_offset
+ 3),
1906 splt
->contents
+ code_offset
+ 4);
1907 bfd_put_16 (output_bfd
, l32r_offset (got_base
+ 4,
1908 plt_base
+ code_offset
+ 6),
1909 splt
->contents
+ code_offset
+ 7);
1910 bfd_put_16 (output_bfd
, l32r_offset (got_base
+ lit_offset
,
1911 plt_base
+ code_offset
+ 9),
1912 splt
->contents
+ code_offset
+ 10);
1914 return plt_base
+ code_offset
;
1918 /* Relocate an Xtensa ELF section. This is invoked by the linker for
1919 both relocatable and final links. */
1922 elf_xtensa_relocate_section (bfd
*output_bfd
,
1923 struct bfd_link_info
*info
,
1925 asection
*input_section
,
1927 Elf_Internal_Rela
*relocs
,
1928 Elf_Internal_Sym
*local_syms
,
1929 asection
**local_sections
)
1931 struct elf_xtensa_link_hash_table
*htab
;
1932 Elf_Internal_Shdr
*symtab_hdr
;
1933 Elf_Internal_Rela
*rel
;
1934 Elf_Internal_Rela
*relend
;
1935 struct elf_link_hash_entry
**sym_hashes
;
1936 property_table_entry
*lit_table
= 0;
1938 char *error_message
= NULL
;
1939 bfd_size_type input_size
;
1941 if (!xtensa_default_isa
)
1942 xtensa_default_isa
= xtensa_isa_init (0, 0);
1944 htab
= elf_xtensa_hash_table (info
);
1945 symtab_hdr
= &elf_tdata (input_bfd
)->symtab_hdr
;
1946 sym_hashes
= elf_sym_hashes (input_bfd
);
1948 if (elf_hash_table (info
)->dynamic_sections_created
)
1950 ltblsize
= xtensa_read_table_entries (input_bfd
, input_section
,
1951 &lit_table
, XTENSA_LIT_SEC_NAME
,
1957 input_size
= bfd_get_section_limit (input_bfd
, input_section
);
1960 relend
= relocs
+ input_section
->reloc_count
;
1961 for (; rel
< relend
; rel
++)
1964 reloc_howto_type
*howto
;
1965 unsigned long r_symndx
;
1966 struct elf_link_hash_entry
*h
;
1967 Elf_Internal_Sym
*sym
;
1970 bfd_reloc_status_type r
;
1971 bfd_boolean is_weak_undef
;
1972 bfd_boolean unresolved_reloc
;
1975 r_type
= ELF32_R_TYPE (rel
->r_info
);
1976 if (r_type
== (int) R_XTENSA_GNU_VTINHERIT
1977 || r_type
== (int) R_XTENSA_GNU_VTENTRY
)
1980 if (r_type
< 0 || r_type
>= (int) R_XTENSA_max
)
1982 bfd_set_error (bfd_error_bad_value
);
1985 howto
= &elf_howto_table
[r_type
];
1987 r_symndx
= ELF32_R_SYM (rel
->r_info
);
1992 is_weak_undef
= FALSE
;
1993 unresolved_reloc
= FALSE
;
1996 if (howto
->partial_inplace
&& !info
->relocatable
)
1998 /* Because R_XTENSA_32 was made partial_inplace to fix some
1999 problems with DWARF info in partial links, there may be
2000 an addend stored in the contents. Take it out of there
2001 and move it back into the addend field of the reloc. */
2002 rel
->r_addend
+= bfd_get_32 (input_bfd
, contents
+ rel
->r_offset
);
2003 bfd_put_32 (input_bfd
, 0, contents
+ rel
->r_offset
);
2006 if (r_symndx
< symtab_hdr
->sh_info
)
2008 sym
= local_syms
+ r_symndx
;
2009 sec
= local_sections
[r_symndx
];
2010 relocation
= _bfd_elf_rela_local_sym (output_bfd
, sym
, &sec
, rel
);
2014 RELOC_FOR_GLOBAL_SYMBOL (info
, input_bfd
, input_section
, rel
,
2015 r_symndx
, symtab_hdr
, sym_hashes
,
2017 unresolved_reloc
, warned
);
2020 && !unresolved_reloc
2021 && h
->root
.type
== bfd_link_hash_undefweak
)
2022 is_weak_undef
= TRUE
;
2025 if (sec
!= NULL
&& elf_discarded_section (sec
))
2027 /* For relocs against symbols from removed linkonce sections,
2028 or sections discarded by a linker script, we just want the
2029 section contents zeroed. Avoid any special processing. */
2030 _bfd_clear_contents (howto
, input_bfd
, contents
+ rel
->r_offset
);
2036 if (info
->relocatable
)
2038 /* This is a relocatable link.
2039 1) If the reloc is against a section symbol, adjust
2040 according to the output section.
2041 2) If there is a new target for this relocation,
2042 the new target will be in the same output section.
2043 We adjust the relocation by the output section
2046 if (relaxing_section
)
2048 /* Check if this references a section in another input file. */
2049 if (!do_fix_for_relocatable_link (rel
, input_bfd
, input_section
,
2052 r_type
= ELF32_R_TYPE (rel
->r_info
);
2055 if (r_type
== R_XTENSA_ASM_SIMPLIFY
)
2057 char *error_message
= NULL
;
2058 /* Convert ASM_SIMPLIFY into the simpler relocation
2059 so that they never escape a relaxing link. */
2060 r
= contract_asm_expansion (contents
, input_size
, rel
,
2062 if (r
!= bfd_reloc_ok
)
2064 if (!((*info
->callbacks
->reloc_dangerous
)
2065 (info
, error_message
, input_bfd
, input_section
,
2069 r_type
= ELF32_R_TYPE (rel
->r_info
);
2072 /* This is a relocatable link, so we don't have to change
2073 anything unless the reloc is against a section symbol,
2074 in which case we have to adjust according to where the
2075 section symbol winds up in the output section. */
2076 if (r_symndx
< symtab_hdr
->sh_info
)
2078 sym
= local_syms
+ r_symndx
;
2079 if (ELF_ST_TYPE (sym
->st_info
) == STT_SECTION
)
2081 sec
= local_sections
[r_symndx
];
2082 rel
->r_addend
+= sec
->output_offset
+ sym
->st_value
;
2086 /* If there is an addend with a partial_inplace howto,
2087 then move the addend to the contents. This is a hack
2088 to work around problems with DWARF in relocatable links
2089 with some previous version of BFD. Now we can't easily get
2090 rid of the hack without breaking backward compatibility.... */
2093 howto
= &elf_howto_table
[r_type
];
2094 if (howto
->partial_inplace
)
2096 r
= elf_xtensa_do_reloc (howto
, input_bfd
, input_section
,
2097 rel
->r_addend
, contents
,
2098 rel
->r_offset
, FALSE
,
2100 if (r
!= bfd_reloc_ok
)
2102 if (!((*info
->callbacks
->reloc_dangerous
)
2103 (info
, error_message
, input_bfd
, input_section
,
2111 /* Done with work for relocatable link; continue with next reloc. */
2115 /* This is a final link. */
2117 if (relaxing_section
)
2119 /* Check if this references a section in another input file. */
2120 do_fix_for_final_link (rel
, input_bfd
, input_section
, contents
,
2123 /* Update some already cached values. */
2124 r_type
= ELF32_R_TYPE (rel
->r_info
);
2125 howto
= &elf_howto_table
[r_type
];
2128 /* Sanity check the address. */
2129 if (rel
->r_offset
>= input_size
2130 && ELF32_R_TYPE (rel
->r_info
) != R_XTENSA_NONE
)
2132 (*_bfd_error_handler
)
2133 (_("%B(%A+0x%lx): relocation offset out of range (size=0x%x)"),
2134 input_bfd
, input_section
, rel
->r_offset
, input_size
);
2135 bfd_set_error (bfd_error_bad_value
);
2139 /* Generate dynamic relocations. */
2140 if (elf_hash_table (info
)->dynamic_sections_created
)
2142 bfd_boolean dynamic_symbol
= elf_xtensa_dynamic_symbol_p (h
, info
);
2144 if (dynamic_symbol
&& is_operand_relocation (r_type
))
2146 /* This is an error. The symbol's real value won't be known
2147 until runtime and it's likely to be out of range anyway. */
2148 const char *name
= h
->root
.root
.string
;
2149 error_message
= vsprint_msg ("invalid relocation for dynamic "
2151 strlen (name
) + 2, name
);
2152 if (!((*info
->callbacks
->reloc_dangerous
)
2153 (info
, error_message
, input_bfd
, input_section
,
2157 else if ((r_type
== R_XTENSA_32
|| r_type
== R_XTENSA_PLT
)
2158 && (input_section
->flags
& SEC_ALLOC
) != 0
2159 && (dynamic_symbol
|| info
->shared
))
2161 Elf_Internal_Rela outrel
;
2165 if (dynamic_symbol
&& r_type
== R_XTENSA_PLT
)
2166 srel
= htab
->srelplt
;
2168 srel
= htab
->srelgot
;
2170 BFD_ASSERT (srel
!= NULL
);
2173 _bfd_elf_section_offset (output_bfd
, info
,
2174 input_section
, rel
->r_offset
);
2176 if ((outrel
.r_offset
| 1) == (bfd_vma
) -1)
2177 memset (&outrel
, 0, sizeof outrel
);
2180 outrel
.r_offset
+= (input_section
->output_section
->vma
2181 + input_section
->output_offset
);
2183 /* Complain if the relocation is in a read-only section
2184 and not in a literal pool. */
2185 if ((input_section
->flags
& SEC_READONLY
) != 0
2186 && !elf_xtensa_in_literal_pool (lit_table
, ltblsize
,
2190 _("dynamic relocation in read-only section");
2191 if (!((*info
->callbacks
->reloc_dangerous
)
2192 (info
, error_message
, input_bfd
, input_section
,
2199 outrel
.r_addend
= rel
->r_addend
;
2202 if (r_type
== R_XTENSA_32
)
2205 ELF32_R_INFO (h
->dynindx
, R_XTENSA_GLOB_DAT
);
2208 else /* r_type == R_XTENSA_PLT */
2211 ELF32_R_INFO (h
->dynindx
, R_XTENSA_JMP_SLOT
);
2213 /* Create the PLT entry and set the initial
2214 contents of the literal entry to the address of
2217 elf_xtensa_create_plt_entry (info
, output_bfd
,
2220 unresolved_reloc
= FALSE
;
2224 /* Generate a RELATIVE relocation. */
2225 outrel
.r_info
= ELF32_R_INFO (0, R_XTENSA_RELATIVE
);
2226 outrel
.r_addend
= 0;
2230 loc
= (srel
->contents
2231 + srel
->reloc_count
++ * sizeof (Elf32_External_Rela
));
2232 bfd_elf32_swap_reloca_out (output_bfd
, &outrel
, loc
);
2233 BFD_ASSERT (sizeof (Elf32_External_Rela
) * srel
->reloc_count
2238 /* Dynamic relocs are not propagated for SEC_DEBUGGING sections
2239 because such sections are not SEC_ALLOC and thus ld.so will
2240 not process them. */
2241 if (unresolved_reloc
2242 && !((input_section
->flags
& SEC_DEBUGGING
) != 0
2245 (*_bfd_error_handler
)
2246 (_("%B(%A+0x%lx): unresolvable %s relocation against symbol `%s'"),
2249 (long) rel
->r_offset
,
2251 h
->root
.root
.string
);
2255 /* There's no point in calling bfd_perform_relocation here.
2256 Just go directly to our "special function". */
2257 r
= elf_xtensa_do_reloc (howto
, input_bfd
, input_section
,
2258 relocation
+ rel
->r_addend
,
2259 contents
, rel
->r_offset
, is_weak_undef
,
2262 if (r
!= bfd_reloc_ok
&& !warned
)
2266 BFD_ASSERT (r
== bfd_reloc_dangerous
|| r
== bfd_reloc_other
);
2267 BFD_ASSERT (error_message
!= NULL
);
2270 name
= h
->root
.root
.string
;
2273 name
= bfd_elf_string_from_elf_section
2274 (input_bfd
, symtab_hdr
->sh_link
, sym
->st_name
);
2275 if (name
&& *name
== '\0')
2276 name
= bfd_section_name (input_bfd
, sec
);
2280 if (rel
->r_addend
== 0)
2281 error_message
= vsprint_msg (error_message
, ": %s",
2282 strlen (name
) + 2, name
);
2284 error_message
= vsprint_msg (error_message
, ": (%s+0x%x)",
2286 name
, (int)rel
->r_addend
);
2289 if (!((*info
->callbacks
->reloc_dangerous
)
2290 (info
, error_message
, input_bfd
, input_section
,
2299 input_section
->reloc_done
= TRUE
;
2305 /* Finish up dynamic symbol handling. There's not much to do here since
2306 the PLT and GOT entries are all set up by relocate_section. */
2309 elf_xtensa_finish_dynamic_symbol (bfd
*output_bfd ATTRIBUTE_UNUSED
,
2310 struct bfd_link_info
*info ATTRIBUTE_UNUSED
,
2311 struct elf_link_hash_entry
*h
,
2312 Elf_Internal_Sym
*sym
)
2314 if (h
->needs_plt
&& !h
->def_regular
)
2316 /* Mark the symbol as undefined, rather than as defined in
2317 the .plt section. Leave the value alone. */
2318 sym
->st_shndx
= SHN_UNDEF
;
2319 /* If the symbol is weak, we do need to clear the value.
2320 Otherwise, the PLT entry would provide a definition for
2321 the symbol even if the symbol wasn't defined anywhere,
2322 and so the symbol would never be NULL. */
2323 if (!h
->ref_regular_nonweak
)
2327 /* Mark _DYNAMIC and _GLOBAL_OFFSET_TABLE_ as absolute. */
2328 if (strcmp (h
->root
.root
.string
, "_DYNAMIC") == 0
2329 || h
== elf_hash_table (info
)->hgot
)
2330 sym
->st_shndx
= SHN_ABS
;
2336 /* Combine adjacent literal table entries in the output. Adjacent
2337 entries within each input section may have been removed during
2338 relaxation, but we repeat the process here, even though it's too late
2339 to shrink the output section, because it's important to minimize the
2340 number of literal table entries to reduce the start-up work for the
2341 runtime linker. Returns the number of remaining table entries or -1
2345 elf_xtensa_combine_prop_entries (bfd
*output_bfd
,
2350 property_table_entry
*table
;
2351 bfd_size_type section_size
, sgotloc_size
;
2355 section_size
= sxtlit
->size
;
2356 BFD_ASSERT (section_size
% 8 == 0);
2357 num
= section_size
/ 8;
2359 sgotloc_size
= sgotloc
->size
;
2360 if (sgotloc_size
!= section_size
)
2362 (*_bfd_error_handler
)
2363 (_("internal inconsistency in size of .got.loc section"));
2367 table
= bfd_malloc (num
* sizeof (property_table_entry
));
2371 /* The ".xt.lit.plt" section has the SEC_IN_MEMORY flag set and this
2372 propagates to the output section, where it doesn't really apply and
2373 where it breaks the following call to bfd_malloc_and_get_section. */
2374 sxtlit
->flags
&= ~SEC_IN_MEMORY
;
2376 if (!bfd_malloc_and_get_section (output_bfd
, sxtlit
, &contents
))
2384 /* There should never be any relocations left at this point, so this
2385 is quite a bit easier than what is done during relaxation. */
2387 /* Copy the raw contents into a property table array and sort it. */
2389 for (n
= 0; n
< num
; n
++)
2391 table
[n
].address
= bfd_get_32 (output_bfd
, &contents
[offset
]);
2392 table
[n
].size
= bfd_get_32 (output_bfd
, &contents
[offset
+ 4]);
2395 qsort (table
, num
, sizeof (property_table_entry
), property_table_compare
);
2397 for (n
= 0; n
< num
; n
++)
2399 bfd_boolean remove
= FALSE
;
2401 if (table
[n
].size
== 0)
2404 (table
[n
-1].address
+ table
[n
-1].size
== table
[n
].address
))
2406 table
[n
-1].size
+= table
[n
].size
;
2412 for (m
= n
; m
< num
- 1; m
++)
2414 table
[m
].address
= table
[m
+1].address
;
2415 table
[m
].size
= table
[m
+1].size
;
2423 /* Copy the data back to the raw contents. */
2425 for (n
= 0; n
< num
; n
++)
2427 bfd_put_32 (output_bfd
, table
[n
].address
, &contents
[offset
]);
2428 bfd_put_32 (output_bfd
, table
[n
].size
, &contents
[offset
+ 4]);
2432 /* Clear the removed bytes. */
2433 if ((bfd_size_type
) (num
* 8) < section_size
)
2434 memset (&contents
[num
* 8], 0, section_size
- num
* 8);
2436 if (! bfd_set_section_contents (output_bfd
, sxtlit
, contents
, 0,
2440 /* Copy the contents to ".got.loc". */
2441 memcpy (sgotloc
->contents
, contents
, section_size
);
2449 /* Finish up the dynamic sections. */
2452 elf_xtensa_finish_dynamic_sections (bfd
*output_bfd
,
2453 struct bfd_link_info
*info
)
2455 struct elf_xtensa_link_hash_table
*htab
;
2457 asection
*sdyn
, *srelplt
, *sgot
, *sxtlit
, *sgotloc
;
2458 Elf32_External_Dyn
*dyncon
, *dynconend
;
2459 int num_xtlit_entries
;
2461 if (! elf_hash_table (info
)->dynamic_sections_created
)
2464 htab
= elf_xtensa_hash_table (info
);
2465 dynobj
= elf_hash_table (info
)->dynobj
;
2466 sdyn
= bfd_get_section_by_name (dynobj
, ".dynamic");
2467 BFD_ASSERT (sdyn
!= NULL
);
2469 /* Set the first entry in the global offset table to the address of
2470 the dynamic section. */
2474 BFD_ASSERT (sgot
->size
== 4);
2476 bfd_put_32 (output_bfd
, 0, sgot
->contents
);
2478 bfd_put_32 (output_bfd
,
2479 sdyn
->output_section
->vma
+ sdyn
->output_offset
,
2483 srelplt
= htab
->srelplt
;
2484 if (srelplt
&& srelplt
->size
!= 0)
2486 asection
*sgotplt
, *srelgot
, *spltlittbl
;
2487 int chunk
, plt_chunks
, plt_entries
;
2488 Elf_Internal_Rela irela
;
2490 unsigned rtld_reloc
;
2492 srelgot
= htab
->srelgot
;
2493 spltlittbl
= htab
->spltlittbl
;
2494 BFD_ASSERT (srelgot
!= NULL
&& spltlittbl
!= NULL
);
2496 /* Find the first XTENSA_RTLD relocation. Presumably the rest
2497 of them follow immediately after.... */
2498 for (rtld_reloc
= 0; rtld_reloc
< srelgot
->reloc_count
; rtld_reloc
++)
2500 loc
= srelgot
->contents
+ rtld_reloc
* sizeof (Elf32_External_Rela
);
2501 bfd_elf32_swap_reloca_in (output_bfd
, loc
, &irela
);
2502 if (ELF32_R_TYPE (irela
.r_info
) == R_XTENSA_RTLD
)
2505 BFD_ASSERT (rtld_reloc
< srelgot
->reloc_count
);
2507 plt_entries
= srelplt
->size
/ sizeof (Elf32_External_Rela
);
2509 (plt_entries
+ PLT_ENTRIES_PER_CHUNK
- 1) / PLT_ENTRIES_PER_CHUNK
;
2511 for (chunk
= 0; chunk
< plt_chunks
; chunk
++)
2513 int chunk_entries
= 0;
2515 sgotplt
= elf_xtensa_get_gotplt_section (info
, chunk
);
2516 BFD_ASSERT (sgotplt
!= NULL
);
2518 /* Emit special RTLD relocations for the first two entries in
2519 each chunk of the .got.plt section. */
2521 loc
= srelgot
->contents
+ rtld_reloc
* sizeof (Elf32_External_Rela
);
2522 bfd_elf32_swap_reloca_in (output_bfd
, loc
, &irela
);
2523 BFD_ASSERT (ELF32_R_TYPE (irela
.r_info
) == R_XTENSA_RTLD
);
2524 irela
.r_offset
= (sgotplt
->output_section
->vma
2525 + sgotplt
->output_offset
);
2526 irela
.r_addend
= 1; /* tell rtld to set value to resolver function */
2527 bfd_elf32_swap_reloca_out (output_bfd
, &irela
, loc
);
2529 BFD_ASSERT (rtld_reloc
<= srelgot
->reloc_count
);
2531 /* Next literal immediately follows the first. */
2532 loc
+= sizeof (Elf32_External_Rela
);
2533 bfd_elf32_swap_reloca_in (output_bfd
, loc
, &irela
);
2534 BFD_ASSERT (ELF32_R_TYPE (irela
.r_info
) == R_XTENSA_RTLD
);
2535 irela
.r_offset
= (sgotplt
->output_section
->vma
2536 + sgotplt
->output_offset
+ 4);
2537 /* Tell rtld to set value to object's link map. */
2539 bfd_elf32_swap_reloca_out (output_bfd
, &irela
, loc
);
2541 BFD_ASSERT (rtld_reloc
<= srelgot
->reloc_count
);
2543 /* Fill in the literal table. */
2544 if (chunk
< plt_chunks
- 1)
2545 chunk_entries
= PLT_ENTRIES_PER_CHUNK
;
2547 chunk_entries
= plt_entries
- (chunk
* PLT_ENTRIES_PER_CHUNK
);
2549 BFD_ASSERT ((unsigned) (chunk
+ 1) * 8 <= spltlittbl
->size
);
2550 bfd_put_32 (output_bfd
,
2551 sgotplt
->output_section
->vma
+ sgotplt
->output_offset
,
2552 spltlittbl
->contents
+ (chunk
* 8) + 0);
2553 bfd_put_32 (output_bfd
,
2554 8 + (chunk_entries
* 4),
2555 spltlittbl
->contents
+ (chunk
* 8) + 4);
2558 /* All the dynamic relocations have been emitted at this point.
2559 Make sure the relocation sections are the correct size. */
2560 if (srelgot
->size
!= (sizeof (Elf32_External_Rela
)
2561 * srelgot
->reloc_count
)
2562 || srelplt
->size
!= (sizeof (Elf32_External_Rela
)
2563 * srelplt
->reloc_count
))
2566 /* The .xt.lit.plt section has just been modified. This must
2567 happen before the code below which combines adjacent literal
2568 table entries, and the .xt.lit.plt contents have to be forced to
2570 if (! bfd_set_section_contents (output_bfd
,
2571 spltlittbl
->output_section
,
2572 spltlittbl
->contents
,
2573 spltlittbl
->output_offset
,
2576 /* Clear SEC_HAS_CONTENTS so the contents won't be output again. */
2577 spltlittbl
->flags
&= ~SEC_HAS_CONTENTS
;
2580 /* Combine adjacent literal table entries. */
2581 BFD_ASSERT (! info
->relocatable
);
2582 sxtlit
= bfd_get_section_by_name (output_bfd
, ".xt.lit");
2583 sgotloc
= htab
->sgotloc
;
2584 BFD_ASSERT (sxtlit
&& sgotloc
);
2586 elf_xtensa_combine_prop_entries (output_bfd
, sxtlit
, sgotloc
);
2587 if (num_xtlit_entries
< 0)
2590 dyncon
= (Elf32_External_Dyn
*) sdyn
->contents
;
2591 dynconend
= (Elf32_External_Dyn
*) (sdyn
->contents
+ sdyn
->size
);
2592 for (; dyncon
< dynconend
; dyncon
++)
2594 Elf_Internal_Dyn dyn
;
2596 bfd_elf32_swap_dyn_in (dynobj
, dyncon
, &dyn
);
2603 case DT_XTENSA_GOT_LOC_SZ
:
2604 dyn
.d_un
.d_val
= num_xtlit_entries
;
2607 case DT_XTENSA_GOT_LOC_OFF
:
2608 dyn
.d_un
.d_ptr
= htab
->sgotloc
->vma
;
2612 dyn
.d_un
.d_ptr
= htab
->sgot
->vma
;
2616 dyn
.d_un
.d_ptr
= htab
->srelplt
->vma
;
2620 dyn
.d_un
.d_val
= htab
->srelplt
->size
;
2624 /* Adjust RELASZ to not include JMPREL. This matches what
2625 glibc expects and what is done for several other ELF
2626 targets (e.g., i386, alpha), but the "correct" behavior
2627 seems to be unresolved. Since the linker script arranges
2628 for .rela.plt to follow all other relocation sections, we
2629 don't have to worry about changing the DT_RELA entry. */
2631 dyn
.d_un
.d_val
-= htab
->srelplt
->size
;
2635 bfd_elf32_swap_dyn_out (output_bfd
, &dyn
, dyncon
);
2642 /* Functions for dealing with the e_flags field. */
2644 /* Merge backend specific data from an object file to the output
2645 object file when linking. */
2648 elf_xtensa_merge_private_bfd_data (bfd
*ibfd
, bfd
*obfd
)
2650 unsigned out_mach
, in_mach
;
2651 flagword out_flag
, in_flag
;
2653 /* Check if we have the same endianess. */
2654 if (!_bfd_generic_verify_endian_match (ibfd
, obfd
))
2657 /* Don't even pretend to support mixed-format linking. */
2658 if (bfd_get_flavour (ibfd
) != bfd_target_elf_flavour
2659 || bfd_get_flavour (obfd
) != bfd_target_elf_flavour
)
2662 out_flag
= elf_elfheader (obfd
)->e_flags
;
2663 in_flag
= elf_elfheader (ibfd
)->e_flags
;
2665 out_mach
= out_flag
& EF_XTENSA_MACH
;
2666 in_mach
= in_flag
& EF_XTENSA_MACH
;
2667 if (out_mach
!= in_mach
)
2669 (*_bfd_error_handler
)
2670 (_("%B: incompatible machine type. Output is 0x%x. Input is 0x%x"),
2671 ibfd
, out_mach
, in_mach
);
2672 bfd_set_error (bfd_error_wrong_format
);
2676 if (! elf_flags_init (obfd
))
2678 elf_flags_init (obfd
) = TRUE
;
2679 elf_elfheader (obfd
)->e_flags
= in_flag
;
2681 if (bfd_get_arch (obfd
) == bfd_get_arch (ibfd
)
2682 && bfd_get_arch_info (obfd
)->the_default
)
2683 return bfd_set_arch_mach (obfd
, bfd_get_arch (ibfd
),
2684 bfd_get_mach (ibfd
));
2689 if ((out_flag
& EF_XTENSA_XT_INSN
) != (in_flag
& EF_XTENSA_XT_INSN
))
2690 elf_elfheader (obfd
)->e_flags
&= (~ EF_XTENSA_XT_INSN
);
2692 if ((out_flag
& EF_XTENSA_XT_LIT
) != (in_flag
& EF_XTENSA_XT_LIT
))
2693 elf_elfheader (obfd
)->e_flags
&= (~ EF_XTENSA_XT_LIT
);
2700 elf_xtensa_set_private_flags (bfd
*abfd
, flagword flags
)
2702 BFD_ASSERT (!elf_flags_init (abfd
)
2703 || elf_elfheader (abfd
)->e_flags
== flags
);
2705 elf_elfheader (abfd
)->e_flags
|= flags
;
2706 elf_flags_init (abfd
) = TRUE
;
2713 elf_xtensa_print_private_bfd_data (bfd
*abfd
, void *farg
)
2715 FILE *f
= (FILE *) farg
;
2716 flagword e_flags
= elf_elfheader (abfd
)->e_flags
;
2718 fprintf (f
, "\nXtensa header:\n");
2719 if ((e_flags
& EF_XTENSA_MACH
) == E_XTENSA_MACH
)
2720 fprintf (f
, "\nMachine = Base\n");
2722 fprintf (f
, "\nMachine Id = 0x%x\n", e_flags
& EF_XTENSA_MACH
);
2724 fprintf (f
, "Insn tables = %s\n",
2725 (e_flags
& EF_XTENSA_XT_INSN
) ? "true" : "false");
2727 fprintf (f
, "Literal tables = %s\n",
2728 (e_flags
& EF_XTENSA_XT_LIT
) ? "true" : "false");
2730 return _bfd_elf_print_private_bfd_data (abfd
, farg
);
2734 /* Set the right machine number for an Xtensa ELF file. */
2737 elf_xtensa_object_p (bfd
*abfd
)
2740 unsigned long arch
= elf_elfheader (abfd
)->e_flags
& EF_XTENSA_MACH
;
2745 mach
= bfd_mach_xtensa
;
2751 (void) bfd_default_set_arch_mach (abfd
, bfd_arch_xtensa
, mach
);
2756 /* The final processing done just before writing out an Xtensa ELF object
2757 file. This gets the Xtensa architecture right based on the machine
2761 elf_xtensa_final_write_processing (bfd
*abfd
,
2762 bfd_boolean linker ATTRIBUTE_UNUSED
)
2767 switch (mach
= bfd_get_mach (abfd
))
2769 case bfd_mach_xtensa
:
2770 val
= E_XTENSA_MACH
;
2776 elf_elfheader (abfd
)->e_flags
&= (~ EF_XTENSA_MACH
);
2777 elf_elfheader (abfd
)->e_flags
|= val
;
2781 static enum elf_reloc_type_class
2782 elf_xtensa_reloc_type_class (const Elf_Internal_Rela
*rela
)
2784 switch ((int) ELF32_R_TYPE (rela
->r_info
))
2786 case R_XTENSA_RELATIVE
:
2787 return reloc_class_relative
;
2788 case R_XTENSA_JMP_SLOT
:
2789 return reloc_class_plt
;
2791 return reloc_class_normal
;
2797 elf_xtensa_discard_info_for_section (bfd
*abfd
,
2798 struct elf_reloc_cookie
*cookie
,
2799 struct bfd_link_info
*info
,
2803 bfd_vma section_size
;
2804 bfd_vma offset
, actual_offset
;
2805 size_t removed_bytes
= 0;
2807 section_size
= sec
->size
;
2808 if (section_size
== 0 || section_size
% 8 != 0)
2811 if (sec
->output_section
2812 && bfd_is_abs_section (sec
->output_section
))
2815 contents
= retrieve_contents (abfd
, sec
, info
->keep_memory
);
2819 cookie
->rels
= retrieve_internal_relocs (abfd
, sec
, info
->keep_memory
);
2822 release_contents (sec
, contents
);
2826 cookie
->rel
= cookie
->rels
;
2827 cookie
->relend
= cookie
->rels
+ sec
->reloc_count
;
2829 for (offset
= 0; offset
< section_size
; offset
+= 8)
2831 actual_offset
= offset
- removed_bytes
;
2833 /* The ...symbol_deleted_p function will skip over relocs but it
2834 won't adjust their offsets, so do that here. */
2835 while (cookie
->rel
< cookie
->relend
2836 && cookie
->rel
->r_offset
< offset
)
2838 cookie
->rel
->r_offset
-= removed_bytes
;
2842 while (cookie
->rel
< cookie
->relend
2843 && cookie
->rel
->r_offset
== offset
)
2845 if (bfd_elf_reloc_symbol_deleted_p (offset
, cookie
))
2847 /* Remove the table entry. (If the reloc type is NONE, then
2848 the entry has already been merged with another and deleted
2849 during relaxation.) */
2850 if (ELF32_R_TYPE (cookie
->rel
->r_info
) != R_XTENSA_NONE
)
2852 /* Shift the contents up. */
2853 if (offset
+ 8 < section_size
)
2854 memmove (&contents
[actual_offset
],
2855 &contents
[actual_offset
+8],
2856 section_size
- offset
- 8);
2860 /* Remove this relocation. */
2861 cookie
->rel
->r_info
= ELF32_R_INFO (0, R_XTENSA_NONE
);
2864 /* Adjust the relocation offset for previous removals. This
2865 should not be done before calling ...symbol_deleted_p
2866 because it might mess up the offset comparisons there.
2867 Make sure the offset doesn't underflow in the case where
2868 the first entry is removed. */
2869 if (cookie
->rel
->r_offset
>= removed_bytes
)
2870 cookie
->rel
->r_offset
-= removed_bytes
;
2872 cookie
->rel
->r_offset
= 0;
2878 if (removed_bytes
!= 0)
2880 /* Adjust any remaining relocs (shouldn't be any). */
2881 for (; cookie
->rel
< cookie
->relend
; cookie
->rel
++)
2883 if (cookie
->rel
->r_offset
>= removed_bytes
)
2884 cookie
->rel
->r_offset
-= removed_bytes
;
2886 cookie
->rel
->r_offset
= 0;
2889 /* Clear the removed bytes. */
2890 memset (&contents
[section_size
- removed_bytes
], 0, removed_bytes
);
2892 pin_contents (sec
, contents
);
2893 pin_internal_relocs (sec
, cookie
->rels
);
2896 sec
->size
= section_size
- removed_bytes
;
2898 if (xtensa_is_littable_section (sec
))
2900 asection
*sgotloc
= elf_xtensa_hash_table (info
)->sgotloc
;
2902 sgotloc
->size
-= removed_bytes
;
2907 release_contents (sec
, contents
);
2908 release_internal_relocs (sec
, cookie
->rels
);
2911 return (removed_bytes
!= 0);
2916 elf_xtensa_discard_info (bfd
*abfd
,
2917 struct elf_reloc_cookie
*cookie
,
2918 struct bfd_link_info
*info
)
2921 bfd_boolean changed
= FALSE
;
2923 for (sec
= abfd
->sections
; sec
!= NULL
; sec
= sec
->next
)
2925 if (xtensa_is_property_section (sec
))
2927 if (elf_xtensa_discard_info_for_section (abfd
, cookie
, info
, sec
))
2937 elf_xtensa_ignore_discarded_relocs (asection
*sec
)
2939 return xtensa_is_property_section (sec
);
2944 elf_xtensa_action_discarded (asection
*sec
)
2946 if (strcmp (".xt_except_table", sec
->name
) == 0)
2949 if (strcmp (".xt_except_desc", sec
->name
) == 0)
2952 return _bfd_elf_default_action_discarded (sec
);
2956 /* Support for core dump NOTE sections. */
2959 elf_xtensa_grok_prstatus (bfd
*abfd
, Elf_Internal_Note
*note
)
2964 /* The size for Xtensa is variable, so don't try to recognize the format
2965 based on the size. Just assume this is GNU/Linux. */
2968 elf_tdata (abfd
)->core_signal
= bfd_get_16 (abfd
, note
->descdata
+ 12);
2971 elf_tdata (abfd
)->core_pid
= bfd_get_32 (abfd
, note
->descdata
+ 24);
2975 size
= note
->descsz
- offset
- 4;
2977 /* Make a ".reg/999" section. */
2978 return _bfd_elfcore_make_pseudosection (abfd
, ".reg",
2979 size
, note
->descpos
+ offset
);
2984 elf_xtensa_grok_psinfo (bfd
*abfd
, Elf_Internal_Note
*note
)
2986 switch (note
->descsz
)
2991 case 128: /* GNU/Linux elf_prpsinfo */
2992 elf_tdata (abfd
)->core_program
2993 = _bfd_elfcore_strndup (abfd
, note
->descdata
+ 32, 16);
2994 elf_tdata (abfd
)->core_command
2995 = _bfd_elfcore_strndup (abfd
, note
->descdata
+ 48, 80);
2998 /* Note that for some reason, a spurious space is tacked
2999 onto the end of the args in some (at least one anyway)
3000 implementations, so strip it off if it exists. */
3003 char *command
= elf_tdata (abfd
)->core_command
;
3004 int n
= strlen (command
);
3006 if (0 < n
&& command
[n
- 1] == ' ')
3007 command
[n
- 1] = '\0';
3014 /* Generic Xtensa configurability stuff. */
3016 static xtensa_opcode callx0_op
= XTENSA_UNDEFINED
;
3017 static xtensa_opcode callx4_op
= XTENSA_UNDEFINED
;
3018 static xtensa_opcode callx8_op
= XTENSA_UNDEFINED
;
3019 static xtensa_opcode callx12_op
= XTENSA_UNDEFINED
;
3020 static xtensa_opcode call0_op
= XTENSA_UNDEFINED
;
3021 static xtensa_opcode call4_op
= XTENSA_UNDEFINED
;
3022 static xtensa_opcode call8_op
= XTENSA_UNDEFINED
;
3023 static xtensa_opcode call12_op
= XTENSA_UNDEFINED
;
3026 init_call_opcodes (void)
3028 if (callx0_op
== XTENSA_UNDEFINED
)
3030 callx0_op
= xtensa_opcode_lookup (xtensa_default_isa
, "callx0");
3031 callx4_op
= xtensa_opcode_lookup (xtensa_default_isa
, "callx4");
3032 callx8_op
= xtensa_opcode_lookup (xtensa_default_isa
, "callx8");
3033 callx12_op
= xtensa_opcode_lookup (xtensa_default_isa
, "callx12");
3034 call0_op
= xtensa_opcode_lookup (xtensa_default_isa
, "call0");
3035 call4_op
= xtensa_opcode_lookup (xtensa_default_isa
, "call4");
3036 call8_op
= xtensa_opcode_lookup (xtensa_default_isa
, "call8");
3037 call12_op
= xtensa_opcode_lookup (xtensa_default_isa
, "call12");
3043 is_indirect_call_opcode (xtensa_opcode opcode
)
3045 init_call_opcodes ();
3046 return (opcode
== callx0_op
3047 || opcode
== callx4_op
3048 || opcode
== callx8_op
3049 || opcode
== callx12_op
);
3054 is_direct_call_opcode (xtensa_opcode opcode
)
3056 init_call_opcodes ();
3057 return (opcode
== call0_op
3058 || opcode
== call4_op
3059 || opcode
== call8_op
3060 || opcode
== call12_op
);
3065 is_windowed_call_opcode (xtensa_opcode opcode
)
3067 init_call_opcodes ();
3068 return (opcode
== call4_op
3069 || opcode
== call8_op
3070 || opcode
== call12_op
3071 || opcode
== callx4_op
3072 || opcode
== callx8_op
3073 || opcode
== callx12_op
);
3077 static xtensa_opcode
3078 get_const16_opcode (void)
3080 static bfd_boolean done_lookup
= FALSE
;
3081 static xtensa_opcode const16_opcode
= XTENSA_UNDEFINED
;
3084 const16_opcode
= xtensa_opcode_lookup (xtensa_default_isa
, "const16");
3087 return const16_opcode
;
3091 static xtensa_opcode
3092 get_l32r_opcode (void)
3094 static xtensa_opcode l32r_opcode
= XTENSA_UNDEFINED
;
3095 static bfd_boolean done_lookup
= FALSE
;
3099 l32r_opcode
= xtensa_opcode_lookup (xtensa_default_isa
, "l32r");
3107 l32r_offset (bfd_vma addr
, bfd_vma pc
)
3111 offset
= addr
- ((pc
+3) & -4);
3112 BFD_ASSERT ((offset
& ((1 << 2) - 1)) == 0);
3113 offset
= (signed int) offset
>> 2;
3114 BFD_ASSERT ((signed int) offset
>> 16 == -1);
3120 get_relocation_opnd (xtensa_opcode opcode
, int r_type
)
3122 xtensa_isa isa
= xtensa_default_isa
;
3123 int last_immed
, last_opnd
, opi
;
3125 if (opcode
== XTENSA_UNDEFINED
)
3126 return XTENSA_UNDEFINED
;
3128 /* Find the last visible PC-relative immediate operand for the opcode.
3129 If there are no PC-relative immediates, then choose the last visible
3130 immediate; otherwise, fail and return XTENSA_UNDEFINED. */
3131 last_immed
= XTENSA_UNDEFINED
;
3132 last_opnd
= xtensa_opcode_num_operands (isa
, opcode
);
3133 for (opi
= last_opnd
- 1; opi
>= 0; opi
--)
3135 if (xtensa_operand_is_visible (isa
, opcode
, opi
) == 0)
3137 if (xtensa_operand_is_PCrelative (isa
, opcode
, opi
) == 1)
3142 if (last_immed
== XTENSA_UNDEFINED
3143 && xtensa_operand_is_register (isa
, opcode
, opi
) == 0)
3147 return XTENSA_UNDEFINED
;
3149 /* If the operand number was specified in an old-style relocation,
3150 check for consistency with the operand computed above. */
3151 if (r_type
>= R_XTENSA_OP0
&& r_type
<= R_XTENSA_OP2
)
3153 int reloc_opnd
= r_type
- R_XTENSA_OP0
;
3154 if (reloc_opnd
!= last_immed
)
3155 return XTENSA_UNDEFINED
;
3163 get_relocation_slot (int r_type
)
3173 if (r_type
>= R_XTENSA_SLOT0_OP
&& r_type
<= R_XTENSA_SLOT14_OP
)
3174 return r_type
- R_XTENSA_SLOT0_OP
;
3175 if (r_type
>= R_XTENSA_SLOT0_ALT
&& r_type
<= R_XTENSA_SLOT14_ALT
)
3176 return r_type
- R_XTENSA_SLOT0_ALT
;
3180 return XTENSA_UNDEFINED
;
3184 /* Get the opcode for a relocation. */
3186 static xtensa_opcode
3187 get_relocation_opcode (bfd
*abfd
,
3190 Elf_Internal_Rela
*irel
)
3192 static xtensa_insnbuf ibuff
= NULL
;
3193 static xtensa_insnbuf sbuff
= NULL
;
3194 xtensa_isa isa
= xtensa_default_isa
;
3198 if (contents
== NULL
)
3199 return XTENSA_UNDEFINED
;
3201 if (bfd_get_section_limit (abfd
, sec
) <= irel
->r_offset
)
3202 return XTENSA_UNDEFINED
;
3206 ibuff
= xtensa_insnbuf_alloc (isa
);
3207 sbuff
= xtensa_insnbuf_alloc (isa
);
3210 /* Decode the instruction. */
3211 xtensa_insnbuf_from_chars (isa
, ibuff
, &contents
[irel
->r_offset
],
3212 sec
->size
- irel
->r_offset
);
3213 fmt
= xtensa_format_decode (isa
, ibuff
);
3214 slot
= get_relocation_slot (ELF32_R_TYPE (irel
->r_info
));
3215 if (slot
== XTENSA_UNDEFINED
)
3216 return XTENSA_UNDEFINED
;
3217 xtensa_format_get_slot (isa
, fmt
, slot
, ibuff
, sbuff
);
3218 return xtensa_opcode_decode (isa
, fmt
, slot
, sbuff
);
3223 is_l32r_relocation (bfd
*abfd
,
3226 Elf_Internal_Rela
*irel
)
3228 xtensa_opcode opcode
;
3229 if (!is_operand_relocation (ELF32_R_TYPE (irel
->r_info
)))
3231 opcode
= get_relocation_opcode (abfd
, sec
, contents
, irel
);
3232 return (opcode
== get_l32r_opcode ());
3236 static bfd_size_type
3237 get_asm_simplify_size (bfd_byte
*contents
,
3238 bfd_size_type content_len
,
3239 bfd_size_type offset
)
3241 bfd_size_type insnlen
, size
= 0;
3243 /* Decode the size of the next two instructions. */
3244 insnlen
= insn_decode_len (contents
, content_len
, offset
);
3250 insnlen
= insn_decode_len (contents
, content_len
, offset
+ size
);
3260 is_alt_relocation (int r_type
)
3262 return (r_type
>= R_XTENSA_SLOT0_ALT
3263 && r_type
<= R_XTENSA_SLOT14_ALT
);
3268 is_operand_relocation (int r_type
)
3278 if (r_type
>= R_XTENSA_SLOT0_OP
&& r_type
<= R_XTENSA_SLOT14_OP
)
3280 if (r_type
>= R_XTENSA_SLOT0_ALT
&& r_type
<= R_XTENSA_SLOT14_ALT
)
3289 #define MIN_INSN_LENGTH 2
3291 /* Return 0 if it fails to decode. */
3294 insn_decode_len (bfd_byte
*contents
,
3295 bfd_size_type content_len
,
3296 bfd_size_type offset
)
3299 xtensa_isa isa
= xtensa_default_isa
;
3301 static xtensa_insnbuf ibuff
= NULL
;
3303 if (offset
+ MIN_INSN_LENGTH
> content_len
)
3307 ibuff
= xtensa_insnbuf_alloc (isa
);
3308 xtensa_insnbuf_from_chars (isa
, ibuff
, &contents
[offset
],
3309 content_len
- offset
);
3310 fmt
= xtensa_format_decode (isa
, ibuff
);
3311 if (fmt
== XTENSA_UNDEFINED
)
3313 insn_len
= xtensa_format_length (isa
, fmt
);
3314 if (insn_len
== XTENSA_UNDEFINED
)
3320 /* Decode the opcode for a single slot instruction.
3321 Return 0 if it fails to decode or the instruction is multi-slot. */
3324 insn_decode_opcode (bfd_byte
*contents
,
3325 bfd_size_type content_len
,
3326 bfd_size_type offset
,
3329 xtensa_isa isa
= xtensa_default_isa
;
3331 static xtensa_insnbuf insnbuf
= NULL
;
3332 static xtensa_insnbuf slotbuf
= NULL
;
3334 if (offset
+ MIN_INSN_LENGTH
> content_len
)
3335 return XTENSA_UNDEFINED
;
3337 if (insnbuf
== NULL
)
3339 insnbuf
= xtensa_insnbuf_alloc (isa
);
3340 slotbuf
= xtensa_insnbuf_alloc (isa
);
3343 xtensa_insnbuf_from_chars (isa
, insnbuf
, &contents
[offset
],
3344 content_len
- offset
);
3345 fmt
= xtensa_format_decode (isa
, insnbuf
);
3346 if (fmt
== XTENSA_UNDEFINED
)
3347 return XTENSA_UNDEFINED
;
3349 if (slot
>= xtensa_format_num_slots (isa
, fmt
))
3350 return XTENSA_UNDEFINED
;
3352 xtensa_format_get_slot (isa
, fmt
, slot
, insnbuf
, slotbuf
);
3353 return xtensa_opcode_decode (isa
, fmt
, slot
, slotbuf
);
3357 /* The offset is the offset in the contents.
3358 The address is the address of that offset. */
3361 check_branch_target_aligned (bfd_byte
*contents
,
3362 bfd_size_type content_length
,
3366 bfd_size_type insn_len
= insn_decode_len (contents
, content_length
, offset
);
3369 return check_branch_target_aligned_address (address
, insn_len
);
3374 check_loop_aligned (bfd_byte
*contents
,
3375 bfd_size_type content_length
,
3379 bfd_size_type loop_len
, insn_len
;
3380 xtensa_opcode opcode
;
3382 opcode
= insn_decode_opcode (contents
, content_length
, offset
, 0);
3383 if (opcode
== XTENSA_UNDEFINED
3384 || xtensa_opcode_is_loop (xtensa_default_isa
, opcode
) != 1)
3390 loop_len
= insn_decode_len (contents
, content_length
, offset
);
3391 insn_len
= insn_decode_len (contents
, content_length
, offset
+ loop_len
);
3392 if (loop_len
== 0 || insn_len
== 0)
3398 return check_branch_target_aligned_address (address
+ loop_len
, insn_len
);
3403 check_branch_target_aligned_address (bfd_vma addr
, int len
)
3406 return (addr
% 8 == 0);
3407 return ((addr
>> 2) == ((addr
+ len
- 1) >> 2));
3411 /* Instruction widening and narrowing. */
3413 /* When FLIX is available we need to access certain instructions only
3414 when they are 16-bit or 24-bit instructions. This table caches
3415 information about such instructions by walking through all the
3416 opcodes and finding the smallest single-slot format into which each
3419 static xtensa_format
*op_single_fmt_table
= NULL
;
3423 init_op_single_format_table (void)
3425 xtensa_isa isa
= xtensa_default_isa
;
3426 xtensa_insnbuf ibuf
;
3427 xtensa_opcode opcode
;
3431 if (op_single_fmt_table
)
3434 ibuf
= xtensa_insnbuf_alloc (isa
);
3435 num_opcodes
= xtensa_isa_num_opcodes (isa
);
3437 op_single_fmt_table
= (xtensa_format
*)
3438 bfd_malloc (sizeof (xtensa_format
) * num_opcodes
);
3439 for (opcode
= 0; opcode
< num_opcodes
; opcode
++)
3441 op_single_fmt_table
[opcode
] = XTENSA_UNDEFINED
;
3442 for (fmt
= 0; fmt
< xtensa_isa_num_formats (isa
); fmt
++)
3444 if (xtensa_format_num_slots (isa
, fmt
) == 1
3445 && xtensa_opcode_encode (isa
, fmt
, 0, ibuf
, opcode
) == 0)
3447 xtensa_opcode old_fmt
= op_single_fmt_table
[opcode
];
3448 int fmt_length
= xtensa_format_length (isa
, fmt
);
3449 if (old_fmt
== XTENSA_UNDEFINED
3450 || fmt_length
< xtensa_format_length (isa
, old_fmt
))
3451 op_single_fmt_table
[opcode
] = fmt
;
3455 xtensa_insnbuf_free (isa
, ibuf
);
3459 static xtensa_format
3460 get_single_format (xtensa_opcode opcode
)
3462 init_op_single_format_table ();
3463 return op_single_fmt_table
[opcode
];
3467 /* For the set of narrowable instructions we do NOT include the
3468 narrowings beqz -> beqz.n or bnez -> bnez.n because of complexities
3469 involved during linker relaxation that may require these to
3470 re-expand in some conditions. Also, the narrowing "or" -> mov.n
3471 requires special case code to ensure it only works when op1 == op2. */
3479 struct string_pair narrowable
[] =
3482 { "addi", "addi.n" },
3483 { "addmi", "addi.n" },
3484 { "l32i", "l32i.n" },
3485 { "movi", "movi.n" },
3487 { "retw", "retw.n" },
3488 { "s32i", "s32i.n" },
3489 { "or", "mov.n" } /* special case only when op1 == op2 */
3492 struct string_pair widenable
[] =
3495 { "addi", "addi.n" },
3496 { "addmi", "addi.n" },
3497 { "beqz", "beqz.n" },
3498 { "bnez", "bnez.n" },
3499 { "l32i", "l32i.n" },
3500 { "movi", "movi.n" },
3502 { "retw", "retw.n" },
3503 { "s32i", "s32i.n" },
3504 { "or", "mov.n" } /* special case only when op1 == op2 */
3508 /* Check if an instruction can be "narrowed", i.e., changed from a standard
3509 3-byte instruction to a 2-byte "density" instruction. If it is valid,
3510 return the instruction buffer holding the narrow instruction. Otherwise,
3511 return 0. The set of valid narrowing are specified by a string table
3512 but require some special case operand checks in some cases. */
3514 static xtensa_insnbuf
3515 can_narrow_instruction (xtensa_insnbuf slotbuf
,
3517 xtensa_opcode opcode
)
3519 xtensa_isa isa
= xtensa_default_isa
;
3520 xtensa_format o_fmt
;
3523 static xtensa_insnbuf o_insnbuf
= NULL
;
3524 static xtensa_insnbuf o_slotbuf
= NULL
;
3526 if (o_insnbuf
== NULL
)
3528 o_insnbuf
= xtensa_insnbuf_alloc (isa
);
3529 o_slotbuf
= xtensa_insnbuf_alloc (isa
);
3532 for (opi
= 0; opi
< (sizeof (narrowable
)/sizeof (struct string_pair
)); opi
++)
3534 bfd_boolean is_or
= (strcmp ("or", narrowable
[opi
].wide
) == 0);
3536 if (opcode
== xtensa_opcode_lookup (isa
, narrowable
[opi
].wide
))
3538 uint32 value
, newval
;
3539 int i
, operand_count
, o_operand_count
;
3540 xtensa_opcode o_opcode
;
3542 /* Address does not matter in this case. We might need to
3543 fix it to handle branches/jumps. */
3544 bfd_vma self_address
= 0;
3546 o_opcode
= xtensa_opcode_lookup (isa
, narrowable
[opi
].narrow
);
3547 if (o_opcode
== XTENSA_UNDEFINED
)
3549 o_fmt
= get_single_format (o_opcode
);
3550 if (o_fmt
== XTENSA_UNDEFINED
)
3553 if (xtensa_format_length (isa
, fmt
) != 3
3554 || xtensa_format_length (isa
, o_fmt
) != 2)
3557 xtensa_format_encode (isa
, o_fmt
, o_insnbuf
);
3558 operand_count
= xtensa_opcode_num_operands (isa
, opcode
);
3559 o_operand_count
= xtensa_opcode_num_operands (isa
, o_opcode
);
3561 if (xtensa_opcode_encode (isa
, o_fmt
, 0, o_slotbuf
, o_opcode
) != 0)
3566 if (xtensa_opcode_num_operands (isa
, o_opcode
) != operand_count
)
3571 uint32 rawval0
, rawval1
, rawval2
;
3573 if (o_operand_count
+ 1 != operand_count
3574 || xtensa_operand_get_field (isa
, opcode
, 0,
3575 fmt
, 0, slotbuf
, &rawval0
) != 0
3576 || xtensa_operand_get_field (isa
, opcode
, 1,
3577 fmt
, 0, slotbuf
, &rawval1
) != 0
3578 || xtensa_operand_get_field (isa
, opcode
, 2,
3579 fmt
, 0, slotbuf
, &rawval2
) != 0
3580 || rawval1
!= rawval2
3581 || rawval0
== rawval1
/* it is a nop */)
3585 for (i
= 0; i
< o_operand_count
; ++i
)
3587 if (xtensa_operand_get_field (isa
, opcode
, i
, fmt
, 0,
3589 || xtensa_operand_decode (isa
, opcode
, i
, &value
))
3592 /* PC-relative branches need adjustment, but
3593 the PC-rel operand will always have a relocation. */
3595 if (xtensa_operand_do_reloc (isa
, o_opcode
, i
, &newval
,
3597 || xtensa_operand_encode (isa
, o_opcode
, i
, &newval
)
3598 || xtensa_operand_set_field (isa
, o_opcode
, i
, o_fmt
, 0,
3603 if (xtensa_format_set_slot (isa
, o_fmt
, 0, o_insnbuf
, o_slotbuf
))
3613 /* Attempt to narrow an instruction. If the narrowing is valid, perform
3614 the action in-place directly into the contents and return TRUE. Otherwise,
3615 the return value is FALSE and the contents are not modified. */
3618 narrow_instruction (bfd_byte
*contents
,
3619 bfd_size_type content_length
,
3620 bfd_size_type offset
)
3622 xtensa_opcode opcode
;
3623 bfd_size_type insn_len
;
3624 xtensa_isa isa
= xtensa_default_isa
;
3626 xtensa_insnbuf o_insnbuf
;
3628 static xtensa_insnbuf insnbuf
= NULL
;
3629 static xtensa_insnbuf slotbuf
= NULL
;
3631 if (insnbuf
== NULL
)
3633 insnbuf
= xtensa_insnbuf_alloc (isa
);
3634 slotbuf
= xtensa_insnbuf_alloc (isa
);
3637 BFD_ASSERT (offset
< content_length
);
3639 if (content_length
< 2)
3642 /* We will hand-code a few of these for a little while.
3643 These have all been specified in the assembler aleady. */
3644 xtensa_insnbuf_from_chars (isa
, insnbuf
, &contents
[offset
],
3645 content_length
- offset
);
3646 fmt
= xtensa_format_decode (isa
, insnbuf
);
3647 if (xtensa_format_num_slots (isa
, fmt
) != 1)
3650 if (xtensa_format_get_slot (isa
, fmt
, 0, insnbuf
, slotbuf
) != 0)
3653 opcode
= xtensa_opcode_decode (isa
, fmt
, 0, slotbuf
);
3654 if (opcode
== XTENSA_UNDEFINED
)
3656 insn_len
= xtensa_format_length (isa
, fmt
);
3657 if (insn_len
> content_length
)
3660 o_insnbuf
= can_narrow_instruction (slotbuf
, fmt
, opcode
);
3663 xtensa_insnbuf_to_chars (isa
, o_insnbuf
, contents
+ offset
,
3664 content_length
- offset
);
3672 /* Check if an instruction can be "widened", i.e., changed from a 2-byte
3673 "density" instruction to a standard 3-byte instruction. If it is valid,
3674 return the instruction buffer holding the wide instruction. Otherwise,
3675 return 0. The set of valid widenings are specified by a string table
3676 but require some special case operand checks in some cases. */
3678 static xtensa_insnbuf
3679 can_widen_instruction (xtensa_insnbuf slotbuf
,
3681 xtensa_opcode opcode
)
3683 xtensa_isa isa
= xtensa_default_isa
;
3684 xtensa_format o_fmt
;
3687 static xtensa_insnbuf o_insnbuf
= NULL
;
3688 static xtensa_insnbuf o_slotbuf
= NULL
;
3690 if (o_insnbuf
== NULL
)
3692 o_insnbuf
= xtensa_insnbuf_alloc (isa
);
3693 o_slotbuf
= xtensa_insnbuf_alloc (isa
);
3696 for (opi
= 0; opi
< (sizeof (widenable
)/sizeof (struct string_pair
)); opi
++)
3698 bfd_boolean is_or
= (strcmp ("or", widenable
[opi
].wide
) == 0);
3699 bfd_boolean is_branch
= (strcmp ("beqz", widenable
[opi
].wide
) == 0
3700 || strcmp ("bnez", widenable
[opi
].wide
) == 0);
3702 if (opcode
== xtensa_opcode_lookup (isa
, widenable
[opi
].narrow
))
3704 uint32 value
, newval
;
3705 int i
, operand_count
, o_operand_count
, check_operand_count
;
3706 xtensa_opcode o_opcode
;
3708 /* Address does not matter in this case. We might need to fix it
3709 to handle branches/jumps. */
3710 bfd_vma self_address
= 0;
3712 o_opcode
= xtensa_opcode_lookup (isa
, widenable
[opi
].wide
);
3713 if (o_opcode
== XTENSA_UNDEFINED
)
3715 o_fmt
= get_single_format (o_opcode
);
3716 if (o_fmt
== XTENSA_UNDEFINED
)
3719 if (xtensa_format_length (isa
, fmt
) != 2
3720 || xtensa_format_length (isa
, o_fmt
) != 3)
3723 xtensa_format_encode (isa
, o_fmt
, o_insnbuf
);
3724 operand_count
= xtensa_opcode_num_operands (isa
, opcode
);
3725 o_operand_count
= xtensa_opcode_num_operands (isa
, o_opcode
);
3726 check_operand_count
= o_operand_count
;
3728 if (xtensa_opcode_encode (isa
, o_fmt
, 0, o_slotbuf
, o_opcode
) != 0)
3733 if (xtensa_opcode_num_operands (isa
, o_opcode
) != operand_count
)
3738 uint32 rawval0
, rawval1
;
3740 if (o_operand_count
!= operand_count
+ 1
3741 || xtensa_operand_get_field (isa
, opcode
, 0,
3742 fmt
, 0, slotbuf
, &rawval0
) != 0
3743 || xtensa_operand_get_field (isa
, opcode
, 1,
3744 fmt
, 0, slotbuf
, &rawval1
) != 0
3745 || rawval0
== rawval1
/* it is a nop */)
3749 check_operand_count
--;
3751 for (i
= 0; i
< check_operand_count
; i
++)
3754 if (is_or
&& i
== o_operand_count
- 1)
3756 if (xtensa_operand_get_field (isa
, opcode
, new_i
, fmt
, 0,
3758 || xtensa_operand_decode (isa
, opcode
, new_i
, &value
))
3761 /* PC-relative branches need adjustment, but
3762 the PC-rel operand will always have a relocation. */
3764 if (xtensa_operand_do_reloc (isa
, o_opcode
, i
, &newval
,
3766 || xtensa_operand_encode (isa
, o_opcode
, i
, &newval
)
3767 || xtensa_operand_set_field (isa
, o_opcode
, i
, o_fmt
, 0,
3772 if (xtensa_format_set_slot (isa
, o_fmt
, 0, o_insnbuf
, o_slotbuf
))
3782 /* Attempt to widen an instruction. If the widening is valid, perform
3783 the action in-place directly into the contents and return TRUE. Otherwise,
3784 the return value is FALSE and the contents are not modified. */
3787 widen_instruction (bfd_byte
*contents
,
3788 bfd_size_type content_length
,
3789 bfd_size_type offset
)
3791 xtensa_opcode opcode
;
3792 bfd_size_type insn_len
;
3793 xtensa_isa isa
= xtensa_default_isa
;
3795 xtensa_insnbuf o_insnbuf
;
3797 static xtensa_insnbuf insnbuf
= NULL
;
3798 static xtensa_insnbuf slotbuf
= NULL
;
3800 if (insnbuf
== NULL
)
3802 insnbuf
= xtensa_insnbuf_alloc (isa
);
3803 slotbuf
= xtensa_insnbuf_alloc (isa
);
3806 BFD_ASSERT (offset
< content_length
);
3808 if (content_length
< 2)
3811 /* We will hand-code a few of these for a little while.
3812 These have all been specified in the assembler aleady. */
3813 xtensa_insnbuf_from_chars (isa
, insnbuf
, &contents
[offset
],
3814 content_length
- offset
);
3815 fmt
= xtensa_format_decode (isa
, insnbuf
);
3816 if (xtensa_format_num_slots (isa
, fmt
) != 1)
3819 if (xtensa_format_get_slot (isa
, fmt
, 0, insnbuf
, slotbuf
) != 0)
3822 opcode
= xtensa_opcode_decode (isa
, fmt
, 0, slotbuf
);
3823 if (opcode
== XTENSA_UNDEFINED
)
3825 insn_len
= xtensa_format_length (isa
, fmt
);
3826 if (insn_len
> content_length
)
3829 o_insnbuf
= can_widen_instruction (slotbuf
, fmt
, opcode
);
3832 xtensa_insnbuf_to_chars (isa
, o_insnbuf
, contents
+ offset
,
3833 content_length
- offset
);
3840 /* Code for transforming CALLs at link-time. */
3842 static bfd_reloc_status_type
3843 elf_xtensa_do_asm_simplify (bfd_byte
*contents
,
3845 bfd_vma content_length
,
3846 char **error_message
)
3848 static xtensa_insnbuf insnbuf
= NULL
;
3849 static xtensa_insnbuf slotbuf
= NULL
;
3850 xtensa_format core_format
= XTENSA_UNDEFINED
;
3851 xtensa_opcode opcode
;
3852 xtensa_opcode direct_call_opcode
;
3853 xtensa_isa isa
= xtensa_default_isa
;
3854 bfd_byte
*chbuf
= contents
+ address
;
3857 if (insnbuf
== NULL
)
3859 insnbuf
= xtensa_insnbuf_alloc (isa
);
3860 slotbuf
= xtensa_insnbuf_alloc (isa
);
3863 if (content_length
< address
)
3865 *error_message
= _("Attempt to convert L32R/CALLX to CALL failed");
3866 return bfd_reloc_other
;
3869 opcode
= get_expanded_call_opcode (chbuf
, content_length
- address
, 0);
3870 direct_call_opcode
= swap_callx_for_call_opcode (opcode
);
3871 if (direct_call_opcode
== XTENSA_UNDEFINED
)
3873 *error_message
= _("Attempt to convert L32R/CALLX to CALL failed");
3874 return bfd_reloc_other
;
3877 /* Assemble a NOP ("or a1, a1, a1") into the 0 byte offset. */
3878 core_format
= xtensa_format_lookup (isa
, "x24");
3879 opcode
= xtensa_opcode_lookup (isa
, "or");
3880 xtensa_opcode_encode (isa
, core_format
, 0, slotbuf
, opcode
);
3881 for (opn
= 0; opn
< 3; opn
++)
3884 xtensa_operand_encode (isa
, opcode
, opn
, ®no
);
3885 xtensa_operand_set_field (isa
, opcode
, opn
, core_format
, 0,
3888 xtensa_format_encode (isa
, core_format
, insnbuf
);
3889 xtensa_format_set_slot (isa
, core_format
, 0, insnbuf
, slotbuf
);
3890 xtensa_insnbuf_to_chars (isa
, insnbuf
, chbuf
, content_length
- address
);
3892 /* Assemble a CALL ("callN 0") into the 3 byte offset. */
3893 xtensa_opcode_encode (isa
, core_format
, 0, slotbuf
, direct_call_opcode
);
3894 xtensa_operand_set_field (isa
, opcode
, 0, core_format
, 0, slotbuf
, 0);
3896 xtensa_format_encode (isa
, core_format
, insnbuf
);
3897 xtensa_format_set_slot (isa
, core_format
, 0, insnbuf
, slotbuf
);
3898 xtensa_insnbuf_to_chars (isa
, insnbuf
, chbuf
+ 3,
3899 content_length
- address
- 3);
3901 return bfd_reloc_ok
;
3905 static bfd_reloc_status_type
3906 contract_asm_expansion (bfd_byte
*contents
,
3907 bfd_vma content_length
,
3908 Elf_Internal_Rela
*irel
,
3909 char **error_message
)
3911 bfd_reloc_status_type retval
=
3912 elf_xtensa_do_asm_simplify (contents
, irel
->r_offset
, content_length
,
3915 if (retval
!= bfd_reloc_ok
)
3916 return bfd_reloc_dangerous
;
3918 /* Update the irel->r_offset field so that the right immediate and
3919 the right instruction are modified during the relocation. */
3920 irel
->r_offset
+= 3;
3921 irel
->r_info
= ELF32_R_INFO (ELF32_R_SYM (irel
->r_info
), R_XTENSA_SLOT0_OP
);
3922 return bfd_reloc_ok
;
3926 static xtensa_opcode
3927 swap_callx_for_call_opcode (xtensa_opcode opcode
)
3929 init_call_opcodes ();
3931 if (opcode
== callx0_op
) return call0_op
;
3932 if (opcode
== callx4_op
) return call4_op
;
3933 if (opcode
== callx8_op
) return call8_op
;
3934 if (opcode
== callx12_op
) return call12_op
;
3936 /* Return XTENSA_UNDEFINED if the opcode is not an indirect call. */
3937 return XTENSA_UNDEFINED
;
3941 /* Check if "buf" is pointing to a "L32R aN; CALLX aN" or "CONST16 aN;
3942 CONST16 aN; CALLX aN" sequence, and if so, return the CALLX opcode.
3943 If not, return XTENSA_UNDEFINED. */
3945 #define L32R_TARGET_REG_OPERAND 0
3946 #define CONST16_TARGET_REG_OPERAND 0
3947 #define CALLN_SOURCE_OPERAND 0
3949 static xtensa_opcode
3950 get_expanded_call_opcode (bfd_byte
*buf
, int bufsize
, bfd_boolean
*p_uses_l32r
)
3952 static xtensa_insnbuf insnbuf
= NULL
;
3953 static xtensa_insnbuf slotbuf
= NULL
;
3955 xtensa_opcode opcode
;
3956 xtensa_isa isa
= xtensa_default_isa
;
3957 uint32 regno
, const16_regno
, call_regno
;
3960 if (insnbuf
== NULL
)
3962 insnbuf
= xtensa_insnbuf_alloc (isa
);
3963 slotbuf
= xtensa_insnbuf_alloc (isa
);
3966 xtensa_insnbuf_from_chars (isa
, insnbuf
, buf
, bufsize
);
3967 fmt
= xtensa_format_decode (isa
, insnbuf
);
3968 if (fmt
== XTENSA_UNDEFINED
3969 || xtensa_format_get_slot (isa
, fmt
, 0, insnbuf
, slotbuf
))
3970 return XTENSA_UNDEFINED
;
3972 opcode
= xtensa_opcode_decode (isa
, fmt
, 0, slotbuf
);
3973 if (opcode
== XTENSA_UNDEFINED
)
3974 return XTENSA_UNDEFINED
;
3976 if (opcode
== get_l32r_opcode ())
3979 *p_uses_l32r
= TRUE
;
3980 if (xtensa_operand_get_field (isa
, opcode
, L32R_TARGET_REG_OPERAND
,
3981 fmt
, 0, slotbuf
, ®no
)
3982 || xtensa_operand_decode (isa
, opcode
, L32R_TARGET_REG_OPERAND
,
3984 return XTENSA_UNDEFINED
;
3986 else if (opcode
== get_const16_opcode ())
3989 *p_uses_l32r
= FALSE
;
3990 if (xtensa_operand_get_field (isa
, opcode
, CONST16_TARGET_REG_OPERAND
,
3991 fmt
, 0, slotbuf
, ®no
)
3992 || xtensa_operand_decode (isa
, opcode
, CONST16_TARGET_REG_OPERAND
,
3994 return XTENSA_UNDEFINED
;
3996 /* Check that the next instruction is also CONST16. */
3997 offset
+= xtensa_format_length (isa
, fmt
);
3998 xtensa_insnbuf_from_chars (isa
, insnbuf
, buf
+ offset
, bufsize
- offset
);
3999 fmt
= xtensa_format_decode (isa
, insnbuf
);
4000 if (fmt
== XTENSA_UNDEFINED
4001 || xtensa_format_get_slot (isa
, fmt
, 0, insnbuf
, slotbuf
))
4002 return XTENSA_UNDEFINED
;
4003 opcode
= xtensa_opcode_decode (isa
, fmt
, 0, slotbuf
);
4004 if (opcode
!= get_const16_opcode ())
4005 return XTENSA_UNDEFINED
;
4007 if (xtensa_operand_get_field (isa
, opcode
, CONST16_TARGET_REG_OPERAND
,
4008 fmt
, 0, slotbuf
, &const16_regno
)
4009 || xtensa_operand_decode (isa
, opcode
, CONST16_TARGET_REG_OPERAND
,
4011 || const16_regno
!= regno
)
4012 return XTENSA_UNDEFINED
;
4015 return XTENSA_UNDEFINED
;
4017 /* Next instruction should be an CALLXn with operand 0 == regno. */
4018 offset
+= xtensa_format_length (isa
, fmt
);
4019 xtensa_insnbuf_from_chars (isa
, insnbuf
, buf
+ offset
, bufsize
- offset
);
4020 fmt
= xtensa_format_decode (isa
, insnbuf
);
4021 if (fmt
== XTENSA_UNDEFINED
4022 || xtensa_format_get_slot (isa
, fmt
, 0, insnbuf
, slotbuf
))
4023 return XTENSA_UNDEFINED
;
4024 opcode
= xtensa_opcode_decode (isa
, fmt
, 0, slotbuf
);
4025 if (opcode
== XTENSA_UNDEFINED
4026 || !is_indirect_call_opcode (opcode
))
4027 return XTENSA_UNDEFINED
;
4029 if (xtensa_operand_get_field (isa
, opcode
, CALLN_SOURCE_OPERAND
,
4030 fmt
, 0, slotbuf
, &call_regno
)
4031 || xtensa_operand_decode (isa
, opcode
, CALLN_SOURCE_OPERAND
,
4033 return XTENSA_UNDEFINED
;
4035 if (call_regno
!= regno
)
4036 return XTENSA_UNDEFINED
;
4042 /* Data structures used during relaxation. */
4044 /* r_reloc: relocation values. */
4046 /* Through the relaxation process, we need to keep track of the values
4047 that will result from evaluating relocations. The standard ELF
4048 relocation structure is not sufficient for this purpose because we're
4049 operating on multiple input files at once, so we need to know which
4050 input file a relocation refers to. The r_reloc structure thus
4051 records both the input file (bfd) and ELF relocation.
4053 For efficiency, an r_reloc also contains a "target_offset" field to
4054 cache the target-section-relative offset value that is represented by
4057 The r_reloc also contains a virtual offset that allows multiple
4058 inserted literals to be placed at the same "address" with
4059 different offsets. */
4061 typedef struct r_reloc_struct r_reloc
;
4063 struct r_reloc_struct
4066 Elf_Internal_Rela rela
;
4067 bfd_vma target_offset
;
4068 bfd_vma virtual_offset
;
4072 /* The r_reloc structure is included by value in literal_value, but not
4073 every literal_value has an associated relocation -- some are simple
4074 constants. In such cases, we set all the fields in the r_reloc
4075 struct to zero. The r_reloc_is_const function should be used to
4076 detect this case. */
4079 r_reloc_is_const (const r_reloc
*r_rel
)
4081 return (r_rel
->abfd
== NULL
);
4086 r_reloc_get_target_offset (const r_reloc
*r_rel
)
4088 bfd_vma target_offset
;
4089 unsigned long r_symndx
;
4091 BFD_ASSERT (!r_reloc_is_const (r_rel
));
4092 r_symndx
= ELF32_R_SYM (r_rel
->rela
.r_info
);
4093 target_offset
= get_elf_r_symndx_offset (r_rel
->abfd
, r_symndx
);
4094 return (target_offset
+ r_rel
->rela
.r_addend
);
4098 static struct elf_link_hash_entry
*
4099 r_reloc_get_hash_entry (const r_reloc
*r_rel
)
4101 unsigned long r_symndx
= ELF32_R_SYM (r_rel
->rela
.r_info
);
4102 return get_elf_r_symndx_hash_entry (r_rel
->abfd
, r_symndx
);
4107 r_reloc_get_section (const r_reloc
*r_rel
)
4109 unsigned long r_symndx
= ELF32_R_SYM (r_rel
->rela
.r_info
);
4110 return get_elf_r_symndx_section (r_rel
->abfd
, r_symndx
);
4115 r_reloc_is_defined (const r_reloc
*r_rel
)
4121 sec
= r_reloc_get_section (r_rel
);
4122 if (sec
== bfd_abs_section_ptr
4123 || sec
== bfd_com_section_ptr
4124 || sec
== bfd_und_section_ptr
)
4131 r_reloc_init (r_reloc
*r_rel
,
4133 Elf_Internal_Rela
*irel
,
4135 bfd_size_type content_length
)
4138 reloc_howto_type
*howto
;
4142 r_rel
->rela
= *irel
;
4144 r_rel
->target_offset
= r_reloc_get_target_offset (r_rel
);
4145 r_rel
->virtual_offset
= 0;
4146 r_type
= ELF32_R_TYPE (r_rel
->rela
.r_info
);
4147 howto
= &elf_howto_table
[r_type
];
4148 if (howto
->partial_inplace
)
4150 bfd_vma inplace_val
;
4151 BFD_ASSERT (r_rel
->rela
.r_offset
< content_length
);
4153 inplace_val
= bfd_get_32 (abfd
, &contents
[r_rel
->rela
.r_offset
]);
4154 r_rel
->target_offset
+= inplace_val
;
4158 memset (r_rel
, 0, sizeof (r_reloc
));
4165 print_r_reloc (FILE *fp
, const r_reloc
*r_rel
)
4167 if (r_reloc_is_defined (r_rel
))
4169 asection
*sec
= r_reloc_get_section (r_rel
);
4170 fprintf (fp
, " %s(%s + ", sec
->owner
->filename
, sec
->name
);
4172 else if (r_reloc_get_hash_entry (r_rel
))
4173 fprintf (fp
, " %s + ", r_reloc_get_hash_entry (r_rel
)->root
.root
.string
);
4175 fprintf (fp
, " ?? + ");
4177 fprintf_vma (fp
, r_rel
->target_offset
);
4178 if (r_rel
->virtual_offset
)
4180 fprintf (fp
, " + ");
4181 fprintf_vma (fp
, r_rel
->virtual_offset
);
4190 /* source_reloc: relocations that reference literals. */
4192 /* To determine whether literals can be coalesced, we need to first
4193 record all the relocations that reference the literals. The
4194 source_reloc structure below is used for this purpose. The
4195 source_reloc entries are kept in a per-literal-section array, sorted
4196 by offset within the literal section (i.e., target offset).
4198 The source_sec and r_rel.rela.r_offset fields identify the source of
4199 the relocation. The r_rel field records the relocation value, i.e.,
4200 the offset of the literal being referenced. The opnd field is needed
4201 to determine the range of the immediate field to which the relocation
4202 applies, so we can determine whether another literal with the same
4203 value is within range. The is_null field is true when the relocation
4204 is being removed (e.g., when an L32R is being removed due to a CALLX
4205 that is converted to a direct CALL). */
4207 typedef struct source_reloc_struct source_reloc
;
4209 struct source_reloc_struct
4211 asection
*source_sec
;
4213 xtensa_opcode opcode
;
4215 bfd_boolean is_null
;
4216 bfd_boolean is_abs_literal
;
4221 init_source_reloc (source_reloc
*reloc
,
4222 asection
*source_sec
,
4223 const r_reloc
*r_rel
,
4224 xtensa_opcode opcode
,
4226 bfd_boolean is_abs_literal
)
4228 reloc
->source_sec
= source_sec
;
4229 reloc
->r_rel
= *r_rel
;
4230 reloc
->opcode
= opcode
;
4232 reloc
->is_null
= FALSE
;
4233 reloc
->is_abs_literal
= is_abs_literal
;
4237 /* Find the source_reloc for a particular source offset and relocation
4238 type. Note that the array is sorted by _target_ offset, so this is
4239 just a linear search. */
4241 static source_reloc
*
4242 find_source_reloc (source_reloc
*src_relocs
,
4245 Elf_Internal_Rela
*irel
)
4249 for (i
= 0; i
< src_count
; i
++)
4251 if (src_relocs
[i
].source_sec
== sec
4252 && src_relocs
[i
].r_rel
.rela
.r_offset
== irel
->r_offset
4253 && (ELF32_R_TYPE (src_relocs
[i
].r_rel
.rela
.r_info
)
4254 == ELF32_R_TYPE (irel
->r_info
)))
4255 return &src_relocs
[i
];
4263 source_reloc_compare (const void *ap
, const void *bp
)
4265 const source_reloc
*a
= (const source_reloc
*) ap
;
4266 const source_reloc
*b
= (const source_reloc
*) bp
;
4268 if (a
->r_rel
.target_offset
!= b
->r_rel
.target_offset
)
4269 return (a
->r_rel
.target_offset
- b
->r_rel
.target_offset
);
4271 /* We don't need to sort on these criteria for correctness,
4272 but enforcing a more strict ordering prevents unstable qsort
4273 from behaving differently with different implementations.
4274 Without the code below we get correct but different results
4275 on Solaris 2.7 and 2.8. We would like to always produce the
4276 same results no matter the host. */
4278 if ((!a
->is_null
) - (!b
->is_null
))
4279 return ((!a
->is_null
) - (!b
->is_null
));
4280 return internal_reloc_compare (&a
->r_rel
.rela
, &b
->r_rel
.rela
);
4284 /* Literal values and value hash tables. */
4286 /* Literals with the same value can be coalesced. The literal_value
4287 structure records the value of a literal: the "r_rel" field holds the
4288 information from the relocation on the literal (if there is one) and
4289 the "value" field holds the contents of the literal word itself.
4291 The value_map structure records a literal value along with the
4292 location of a literal holding that value. The value_map hash table
4293 is indexed by the literal value, so that we can quickly check if a
4294 particular literal value has been seen before and is thus a candidate
4297 typedef struct literal_value_struct literal_value
;
4298 typedef struct value_map_struct value_map
;
4299 typedef struct value_map_hash_table_struct value_map_hash_table
;
4301 struct literal_value_struct
4304 unsigned long value
;
4305 bfd_boolean is_abs_literal
;
4308 struct value_map_struct
4310 literal_value val
; /* The literal value. */
4311 r_reloc loc
; /* Location of the literal. */
4315 struct value_map_hash_table_struct
4317 unsigned bucket_count
;
4318 value_map
**buckets
;
4320 bfd_boolean has_last_loc
;
4326 init_literal_value (literal_value
*lit
,
4327 const r_reloc
*r_rel
,
4328 unsigned long value
,
4329 bfd_boolean is_abs_literal
)
4331 lit
->r_rel
= *r_rel
;
4333 lit
->is_abs_literal
= is_abs_literal
;
4338 literal_value_equal (const literal_value
*src1
,
4339 const literal_value
*src2
,
4340 bfd_boolean final_static_link
)
4342 struct elf_link_hash_entry
*h1
, *h2
;
4344 if (r_reloc_is_const (&src1
->r_rel
) != r_reloc_is_const (&src2
->r_rel
))
4347 if (r_reloc_is_const (&src1
->r_rel
))
4348 return (src1
->value
== src2
->value
);
4350 if (ELF32_R_TYPE (src1
->r_rel
.rela
.r_info
)
4351 != ELF32_R_TYPE (src2
->r_rel
.rela
.r_info
))
4354 if (src1
->r_rel
.target_offset
!= src2
->r_rel
.target_offset
)
4357 if (src1
->r_rel
.virtual_offset
!= src2
->r_rel
.virtual_offset
)
4360 if (src1
->value
!= src2
->value
)
4363 /* Now check for the same section (if defined) or the same elf_hash
4364 (if undefined or weak). */
4365 h1
= r_reloc_get_hash_entry (&src1
->r_rel
);
4366 h2
= r_reloc_get_hash_entry (&src2
->r_rel
);
4367 if (r_reloc_is_defined (&src1
->r_rel
)
4368 && (final_static_link
4369 || ((!h1
|| h1
->root
.type
!= bfd_link_hash_defweak
)
4370 && (!h2
|| h2
->root
.type
!= bfd_link_hash_defweak
))))
4372 if (r_reloc_get_section (&src1
->r_rel
)
4373 != r_reloc_get_section (&src2
->r_rel
))
4378 /* Require that the hash entries (i.e., symbols) be identical. */
4379 if (h1
!= h2
|| h1
== 0)
4383 if (src1
->is_abs_literal
!= src2
->is_abs_literal
)
4390 /* Must be power of 2. */
4391 #define INITIAL_HASH_RELOC_BUCKET_COUNT 1024
4393 static value_map_hash_table
*
4394 value_map_hash_table_init (void)
4396 value_map_hash_table
*values
;
4398 values
= (value_map_hash_table
*)
4399 bfd_zmalloc (sizeof (value_map_hash_table
));
4400 values
->bucket_count
= INITIAL_HASH_RELOC_BUCKET_COUNT
;
4402 values
->buckets
= (value_map
**)
4403 bfd_zmalloc (sizeof (value_map
*) * values
->bucket_count
);
4404 if (values
->buckets
== NULL
)
4409 values
->has_last_loc
= FALSE
;
4416 value_map_hash_table_delete (value_map_hash_table
*table
)
4418 free (table
->buckets
);
4424 hash_bfd_vma (bfd_vma val
)
4426 return (val
>> 2) + (val
>> 10);
4431 literal_value_hash (const literal_value
*src
)
4435 hash_val
= hash_bfd_vma (src
->value
);
4436 if (!r_reloc_is_const (&src
->r_rel
))
4440 hash_val
+= hash_bfd_vma (src
->is_abs_literal
* 1000);
4441 hash_val
+= hash_bfd_vma (src
->r_rel
.target_offset
);
4442 hash_val
+= hash_bfd_vma (src
->r_rel
.virtual_offset
);
4444 /* Now check for the same section and the same elf_hash. */
4445 if (r_reloc_is_defined (&src
->r_rel
))
4446 sec_or_hash
= r_reloc_get_section (&src
->r_rel
);
4448 sec_or_hash
= r_reloc_get_hash_entry (&src
->r_rel
);
4449 hash_val
+= hash_bfd_vma ((bfd_vma
) (size_t) sec_or_hash
);
4455 /* Check if the specified literal_value has been seen before. */
4458 value_map_get_cached_value (value_map_hash_table
*map
,
4459 const literal_value
*val
,
4460 bfd_boolean final_static_link
)
4466 idx
= literal_value_hash (val
);
4467 idx
= idx
& (map
->bucket_count
- 1);
4468 bucket
= map
->buckets
[idx
];
4469 for (map_e
= bucket
; map_e
; map_e
= map_e
->next
)
4471 if (literal_value_equal (&map_e
->val
, val
, final_static_link
))
4478 /* Record a new literal value. It is illegal to call this if VALUE
4479 already has an entry here. */
4482 add_value_map (value_map_hash_table
*map
,
4483 const literal_value
*val
,
4485 bfd_boolean final_static_link
)
4487 value_map
**bucket_p
;
4490 value_map
*val_e
= (value_map
*) bfd_zmalloc (sizeof (value_map
));
4493 bfd_set_error (bfd_error_no_memory
);
4497 BFD_ASSERT (!value_map_get_cached_value (map
, val
, final_static_link
));
4501 idx
= literal_value_hash (val
);
4502 idx
= idx
& (map
->bucket_count
- 1);
4503 bucket_p
= &map
->buckets
[idx
];
4505 val_e
->next
= *bucket_p
;
4508 /* FIXME: Consider resizing the hash table if we get too many entries. */
4514 /* Lists of text actions (ta_) for narrowing, widening, longcall
4515 conversion, space fill, code & literal removal, etc. */
4517 /* The following text actions are generated:
4519 "ta_remove_insn" remove an instruction or instructions
4520 "ta_remove_longcall" convert longcall to call
4521 "ta_convert_longcall" convert longcall to nop/call
4522 "ta_narrow_insn" narrow a wide instruction
4523 "ta_widen" widen a narrow instruction
4524 "ta_fill" add fill or remove fill
4525 removed < 0 is a fill; branches to the fill address will be
4526 changed to address + fill size (e.g., address - removed)
4527 removed >= 0 branches to the fill address will stay unchanged
4528 "ta_remove_literal" remove a literal; this action is
4529 indicated when a literal is removed
4531 "ta_add_literal" insert a new literal; this action is
4532 indicated when a literal has been moved.
4533 It may use a virtual_offset because
4534 multiple literals can be placed at the
4537 For each of these text actions, we also record the number of bytes
4538 removed by performing the text action. In the case of a "ta_widen"
4539 or a "ta_fill" that adds space, the removed_bytes will be negative. */
4541 typedef struct text_action_struct text_action
;
4542 typedef struct text_action_list_struct text_action_list
;
4543 typedef enum text_action_enum_t text_action_t
;
4545 enum text_action_enum_t
4548 ta_remove_insn
, /* removed = -size */
4549 ta_remove_longcall
, /* removed = -size */
4550 ta_convert_longcall
, /* removed = 0 */
4551 ta_narrow_insn
, /* removed = -1 */
4552 ta_widen_insn
, /* removed = +1 */
4553 ta_fill
, /* removed = +size */
4559 /* Structure for a text action record. */
4560 struct text_action_struct
4562 text_action_t action
;
4563 asection
*sec
; /* Optional */
4565 bfd_vma virtual_offset
; /* Zero except for adding literals. */
4567 literal_value value
; /* Only valid when adding literals. */
4573 /* List of all of the actions taken on a text section. */
4574 struct text_action_list_struct
4580 static text_action
*
4581 find_fill_action (text_action_list
*l
, asection
*sec
, bfd_vma offset
)
4585 /* It is not necessary to fill at the end of a section. */
4586 if (sec
->size
== offset
)
4589 for (m_p
= &l
->head
; *m_p
&& (*m_p
)->offset
<= offset
; m_p
= &(*m_p
)->next
)
4591 text_action
*t
= *m_p
;
4592 /* When the action is another fill at the same address,
4593 just increase the size. */
4594 if (t
->offset
== offset
&& t
->action
== ta_fill
)
4602 compute_removed_action_diff (const text_action
*ta
,
4606 int removable_space
)
4609 int current_removed
= 0;
4612 current_removed
= ta
->removed_bytes
;
4614 BFD_ASSERT (ta
== NULL
|| ta
->offset
== offset
);
4615 BFD_ASSERT (ta
== NULL
|| ta
->action
== ta_fill
);
4617 /* It is not necessary to fill at the end of a section. Clean this up. */
4618 if (sec
->size
== offset
)
4619 new_removed
= removable_space
- 0;
4623 int added
= -removed
- current_removed
;
4624 /* Ignore multiples of the section alignment. */
4625 added
= ((1 << sec
->alignment_power
) - 1) & added
;
4626 new_removed
= (-added
);
4628 /* Modify for removable. */
4629 space
= removable_space
- new_removed
;
4630 new_removed
= (removable_space
4631 - (((1 << sec
->alignment_power
) - 1) & space
));
4633 return (new_removed
- current_removed
);
4638 adjust_fill_action (text_action
*ta
, int fill_diff
)
4640 ta
->removed_bytes
+= fill_diff
;
4644 /* Add a modification action to the text. For the case of adding or
4645 removing space, modify any current fill and assume that
4646 "unreachable_space" bytes can be freely contracted. Note that a
4647 negative removed value is a fill. */
4650 text_action_add (text_action_list
*l
,
4651 text_action_t action
,
4659 /* It is not necessary to fill at the end of a section. */
4660 if (action
== ta_fill
&& sec
->size
== offset
)
4663 /* It is not necessary to fill 0 bytes. */
4664 if (action
== ta_fill
&& removed
== 0)
4667 for (m_p
= &l
->head
; *m_p
&& (*m_p
)->offset
<= offset
; m_p
= &(*m_p
)->next
)
4669 text_action
*t
= *m_p
;
4670 /* When the action is another fill at the same address,
4671 just increase the size. */
4672 if (t
->offset
== offset
&& t
->action
== ta_fill
&& action
== ta_fill
)
4674 t
->removed_bytes
+= removed
;
4679 /* Create a new record and fill it up. */
4680 ta
= (text_action
*) bfd_zmalloc (sizeof (text_action
));
4681 ta
->action
= action
;
4683 ta
->offset
= offset
;
4684 ta
->removed_bytes
= removed
;
4691 text_action_add_literal (text_action_list
*l
,
4692 text_action_t action
,
4694 const literal_value
*value
,
4699 asection
*sec
= r_reloc_get_section (loc
);
4700 bfd_vma offset
= loc
->target_offset
;
4701 bfd_vma virtual_offset
= loc
->virtual_offset
;
4703 BFD_ASSERT (action
== ta_add_literal
);
4705 for (m_p
= &l
->head
; *m_p
!= NULL
; m_p
= &(*m_p
)->next
)
4707 if ((*m_p
)->offset
> offset
4708 && ((*m_p
)->offset
!= offset
4709 || (*m_p
)->virtual_offset
> virtual_offset
))
4713 /* Create a new record and fill it up. */
4714 ta
= (text_action
*) bfd_zmalloc (sizeof (text_action
));
4715 ta
->action
= action
;
4717 ta
->offset
= offset
;
4718 ta
->virtual_offset
= virtual_offset
;
4720 ta
->removed_bytes
= removed
;
4727 offset_with_removed_text (text_action_list
*action_list
, bfd_vma offset
)
4732 for (r
= action_list
->head
; r
&& r
->offset
<= offset
; r
= r
->next
)
4734 if (r
->offset
< offset
4735 || (r
->action
== ta_fill
&& r
->removed_bytes
< 0))
4736 removed
+= r
->removed_bytes
;
4739 return (offset
- removed
);
4744 action_list_count (text_action_list
*action_list
)
4746 text_action
*r
= action_list
->head
;
4748 for (r
= action_list
->head
; r
!= NULL
; r
= r
->next
)
4757 offset_with_removed_text_before_fill (text_action_list
*action_list
,
4763 for (r
= action_list
->head
; r
&& r
->offset
< offset
; r
= r
->next
)
4764 removed
+= r
->removed_bytes
;
4766 return (offset
- removed
);
4770 /* The find_insn_action routine will only find non-fill actions. */
4772 static text_action
*
4773 find_insn_action (text_action_list
*action_list
, bfd_vma offset
)
4776 for (t
= action_list
->head
; t
; t
= t
->next
)
4778 if (t
->offset
== offset
)
4785 case ta_remove_insn
:
4786 case ta_remove_longcall
:
4787 case ta_convert_longcall
:
4788 case ta_narrow_insn
:
4791 case ta_remove_literal
:
4792 case ta_add_literal
:
4805 print_action_list (FILE *fp
, text_action_list
*action_list
)
4809 fprintf (fp
, "Text Action\n");
4810 for (r
= action_list
->head
; r
!= NULL
; r
= r
->next
)
4812 const char *t
= "unknown";
4815 case ta_remove_insn
:
4816 t
= "remove_insn"; break;
4817 case ta_remove_longcall
:
4818 t
= "remove_longcall"; break;
4819 case ta_convert_longcall
:
4820 t
= "remove_longcall"; break;
4821 case ta_narrow_insn
:
4822 t
= "narrow_insn"; break;
4824 t
= "widen_insn"; break;
4829 case ta_remove_literal
:
4830 t
= "remove_literal"; break;
4831 case ta_add_literal
:
4832 t
= "add_literal"; break;
4835 fprintf (fp
, "%s: %s[0x%lx] \"%s\" %d\n",
4836 r
->sec
->owner
->filename
,
4837 r
->sec
->name
, r
->offset
, t
, r
->removed_bytes
);
4844 /* Lists of literals being coalesced or removed. */
4846 /* In the usual case, the literal identified by "from" is being
4847 coalesced with another literal identified by "to". If the literal is
4848 unused and is being removed altogether, "to.abfd" will be NULL.
4849 The removed_literal entries are kept on a per-section list, sorted
4850 by the "from" offset field. */
4852 typedef struct removed_literal_struct removed_literal
;
4853 typedef struct removed_literal_list_struct removed_literal_list
;
4855 struct removed_literal_struct
4859 removed_literal
*next
;
4862 struct removed_literal_list_struct
4864 removed_literal
*head
;
4865 removed_literal
*tail
;
4869 /* Record that the literal at "from" is being removed. If "to" is not
4870 NULL, the "from" literal is being coalesced with the "to" literal. */
4873 add_removed_literal (removed_literal_list
*removed_list
,
4874 const r_reloc
*from
,
4877 removed_literal
*r
, *new_r
, *next_r
;
4879 new_r
= (removed_literal
*) bfd_zmalloc (sizeof (removed_literal
));
4881 new_r
->from
= *from
;
4885 new_r
->to
.abfd
= NULL
;
4888 r
= removed_list
->head
;
4891 removed_list
->head
= new_r
;
4892 removed_list
->tail
= new_r
;
4894 /* Special check for common case of append. */
4895 else if (removed_list
->tail
->from
.target_offset
< from
->target_offset
)
4897 removed_list
->tail
->next
= new_r
;
4898 removed_list
->tail
= new_r
;
4902 while (r
->from
.target_offset
< from
->target_offset
&& r
->next
)
4908 new_r
->next
= next_r
;
4910 removed_list
->tail
= new_r
;
4915 /* Check if the list of removed literals contains an entry for the
4916 given address. Return the entry if found. */
4918 static removed_literal
*
4919 find_removed_literal (removed_literal_list
*removed_list
, bfd_vma addr
)
4921 removed_literal
*r
= removed_list
->head
;
4922 while (r
&& r
->from
.target_offset
< addr
)
4924 if (r
&& r
->from
.target_offset
== addr
)
4933 print_removed_literals (FILE *fp
, removed_literal_list
*removed_list
)
4936 r
= removed_list
->head
;
4938 fprintf (fp
, "Removed Literals\n");
4939 for (; r
!= NULL
; r
= r
->next
)
4941 print_r_reloc (fp
, &r
->from
);
4942 fprintf (fp
, " => ");
4943 if (r
->to
.abfd
== NULL
)
4944 fprintf (fp
, "REMOVED");
4946 print_r_reloc (fp
, &r
->to
);
4954 /* Per-section data for relaxation. */
4956 typedef struct reloc_bfd_fix_struct reloc_bfd_fix
;
4958 struct xtensa_relax_info_struct
4960 bfd_boolean is_relaxable_literal_section
;
4961 bfd_boolean is_relaxable_asm_section
;
4962 int visited
; /* Number of times visited. */
4964 source_reloc
*src_relocs
; /* Array[src_count]. */
4966 int src_next
; /* Next src_relocs entry to assign. */
4968 removed_literal_list removed_list
;
4969 text_action_list action_list
;
4971 reloc_bfd_fix
*fix_list
;
4972 reloc_bfd_fix
*fix_array
;
4973 unsigned fix_array_count
;
4975 /* Support for expanding the reloc array that is stored
4976 in the section structure. If the relocations have been
4977 reallocated, the newly allocated relocations will be referenced
4978 here along with the actual size allocated. The relocation
4979 count will always be found in the section structure. */
4980 Elf_Internal_Rela
*allocated_relocs
;
4981 unsigned relocs_count
;
4982 unsigned allocated_relocs_count
;
4985 struct elf_xtensa_section_data
4987 struct bfd_elf_section_data elf
;
4988 xtensa_relax_info relax_info
;
4993 elf_xtensa_new_section_hook (bfd
*abfd
, asection
*sec
)
4995 if (!sec
->used_by_bfd
)
4997 struct elf_xtensa_section_data
*sdata
;
4998 bfd_size_type amt
= sizeof (*sdata
);
5000 sdata
= bfd_zalloc (abfd
, amt
);
5003 sec
->used_by_bfd
= sdata
;
5006 return _bfd_elf_new_section_hook (abfd
, sec
);
5010 static xtensa_relax_info
*
5011 get_xtensa_relax_info (asection
*sec
)
5013 struct elf_xtensa_section_data
*section_data
;
5015 /* No info available if no section or if it is an output section. */
5016 if (!sec
|| sec
== sec
->output_section
)
5019 section_data
= (struct elf_xtensa_section_data
*) elf_section_data (sec
);
5020 return §ion_data
->relax_info
;
5025 init_xtensa_relax_info (asection
*sec
)
5027 xtensa_relax_info
*relax_info
= get_xtensa_relax_info (sec
);
5029 relax_info
->is_relaxable_literal_section
= FALSE
;
5030 relax_info
->is_relaxable_asm_section
= FALSE
;
5031 relax_info
->visited
= 0;
5033 relax_info
->src_relocs
= NULL
;
5034 relax_info
->src_count
= 0;
5035 relax_info
->src_next
= 0;
5037 relax_info
->removed_list
.head
= NULL
;
5038 relax_info
->removed_list
.tail
= NULL
;
5040 relax_info
->action_list
.head
= NULL
;
5042 relax_info
->fix_list
= NULL
;
5043 relax_info
->fix_array
= NULL
;
5044 relax_info
->fix_array_count
= 0;
5046 relax_info
->allocated_relocs
= NULL
;
5047 relax_info
->relocs_count
= 0;
5048 relax_info
->allocated_relocs_count
= 0;
5052 /* Coalescing literals may require a relocation to refer to a section in
5053 a different input file, but the standard relocation information
5054 cannot express that. Instead, the reloc_bfd_fix structures are used
5055 to "fix" the relocations that refer to sections in other input files.
5056 These structures are kept on per-section lists. The "src_type" field
5057 records the relocation type in case there are multiple relocations on
5058 the same location. FIXME: This is ugly; an alternative might be to
5059 add new symbols with the "owner" field to some other input file. */
5061 struct reloc_bfd_fix_struct
5065 unsigned src_type
; /* Relocation type. */
5068 asection
*target_sec
;
5069 bfd_vma target_offset
;
5070 bfd_boolean translated
;
5072 reloc_bfd_fix
*next
;
5076 static reloc_bfd_fix
*
5077 reloc_bfd_fix_init (asection
*src_sec
,
5081 asection
*target_sec
,
5082 bfd_vma target_offset
,
5083 bfd_boolean translated
)
5087 fix
= (reloc_bfd_fix
*) bfd_malloc (sizeof (reloc_bfd_fix
));
5088 fix
->src_sec
= src_sec
;
5089 fix
->src_offset
= src_offset
;
5090 fix
->src_type
= src_type
;
5091 fix
->target_abfd
= target_abfd
;
5092 fix
->target_sec
= target_sec
;
5093 fix
->target_offset
= target_offset
;
5094 fix
->translated
= translated
;
5101 add_fix (asection
*src_sec
, reloc_bfd_fix
*fix
)
5103 xtensa_relax_info
*relax_info
;
5105 relax_info
= get_xtensa_relax_info (src_sec
);
5106 fix
->next
= relax_info
->fix_list
;
5107 relax_info
->fix_list
= fix
;
5112 fix_compare (const void *ap
, const void *bp
)
5114 const reloc_bfd_fix
*a
= (const reloc_bfd_fix
*) ap
;
5115 const reloc_bfd_fix
*b
= (const reloc_bfd_fix
*) bp
;
5117 if (a
->src_offset
!= b
->src_offset
)
5118 return (a
->src_offset
- b
->src_offset
);
5119 return (a
->src_type
- b
->src_type
);
5124 cache_fix_array (asection
*sec
)
5126 unsigned i
, count
= 0;
5128 xtensa_relax_info
*relax_info
= get_xtensa_relax_info (sec
);
5130 if (relax_info
== NULL
)
5132 if (relax_info
->fix_list
== NULL
)
5135 for (r
= relax_info
->fix_list
; r
!= NULL
; r
= r
->next
)
5138 relax_info
->fix_array
=
5139 (reloc_bfd_fix
*) bfd_malloc (sizeof (reloc_bfd_fix
) * count
);
5140 relax_info
->fix_array_count
= count
;
5142 r
= relax_info
->fix_list
;
5143 for (i
= 0; i
< count
; i
++, r
= r
->next
)
5145 relax_info
->fix_array
[count
- 1 - i
] = *r
;
5146 relax_info
->fix_array
[count
- 1 - i
].next
= NULL
;
5149 qsort (relax_info
->fix_array
, relax_info
->fix_array_count
,
5150 sizeof (reloc_bfd_fix
), fix_compare
);
5154 static reloc_bfd_fix
*
5155 get_bfd_fix (asection
*sec
, bfd_vma offset
, unsigned type
)
5157 xtensa_relax_info
*relax_info
= get_xtensa_relax_info (sec
);
5161 if (relax_info
== NULL
)
5163 if (relax_info
->fix_list
== NULL
)
5166 if (relax_info
->fix_array
== NULL
)
5167 cache_fix_array (sec
);
5169 key
.src_offset
= offset
;
5170 key
.src_type
= type
;
5171 rv
= bsearch (&key
, relax_info
->fix_array
, relax_info
->fix_array_count
,
5172 sizeof (reloc_bfd_fix
), fix_compare
);
5177 /* Section caching. */
5179 typedef struct section_cache_struct section_cache_t
;
5181 struct section_cache_struct
5185 bfd_byte
*contents
; /* Cache of the section contents. */
5186 bfd_size_type content_length
;
5188 property_table_entry
*ptbl
; /* Cache of the section property table. */
5191 Elf_Internal_Rela
*relocs
; /* Cache of the section relocations. */
5192 unsigned reloc_count
;
5197 init_section_cache (section_cache_t
*sec_cache
)
5199 memset (sec_cache
, 0, sizeof (*sec_cache
));
5204 clear_section_cache (section_cache_t
*sec_cache
)
5208 release_contents (sec_cache
->sec
, sec_cache
->contents
);
5209 release_internal_relocs (sec_cache
->sec
, sec_cache
->relocs
);
5210 if (sec_cache
->ptbl
)
5211 free (sec_cache
->ptbl
);
5212 memset (sec_cache
, 0, sizeof (sec_cache
));
5218 section_cache_section (section_cache_t
*sec_cache
,
5220 struct bfd_link_info
*link_info
)
5223 property_table_entry
*prop_table
= NULL
;
5225 bfd_byte
*contents
= NULL
;
5226 Elf_Internal_Rela
*internal_relocs
= NULL
;
5227 bfd_size_type sec_size
;
5231 if (sec
== sec_cache
->sec
)
5235 sec_size
= bfd_get_section_limit (abfd
, sec
);
5237 /* Get the contents. */
5238 contents
= retrieve_contents (abfd
, sec
, link_info
->keep_memory
);
5239 if (contents
== NULL
&& sec_size
!= 0)
5242 /* Get the relocations. */
5243 internal_relocs
= retrieve_internal_relocs (abfd
, sec
,
5244 link_info
->keep_memory
);
5246 /* Get the entry table. */
5247 ptblsize
= xtensa_read_table_entries (abfd
, sec
, &prop_table
,
5248 XTENSA_PROP_SEC_NAME
, FALSE
);
5252 /* Fill in the new section cache. */
5253 clear_section_cache (sec_cache
);
5254 memset (sec_cache
, 0, sizeof (sec_cache
));
5256 sec_cache
->sec
= sec
;
5257 sec_cache
->contents
= contents
;
5258 sec_cache
->content_length
= sec_size
;
5259 sec_cache
->relocs
= internal_relocs
;
5260 sec_cache
->reloc_count
= sec
->reloc_count
;
5261 sec_cache
->pte_count
= ptblsize
;
5262 sec_cache
->ptbl
= prop_table
;
5267 release_contents (sec
, contents
);
5268 release_internal_relocs (sec
, internal_relocs
);
5275 /* Extended basic blocks. */
5277 /* An ebb_struct represents an Extended Basic Block. Within this
5278 range, we guarantee that all instructions are decodable, the
5279 property table entries are contiguous, and no property table
5280 specifies a segment that cannot have instructions moved. This
5281 structure contains caches of the contents, property table and
5282 relocations for the specified section for easy use. The range is
5283 specified by ranges of indices for the byte offset, property table
5284 offsets and relocation offsets. These must be consistent. */
5286 typedef struct ebb_struct ebb_t
;
5292 bfd_byte
*contents
; /* Cache of the section contents. */
5293 bfd_size_type content_length
;
5295 property_table_entry
*ptbl
; /* Cache of the section property table. */
5298 Elf_Internal_Rela
*relocs
; /* Cache of the section relocations. */
5299 unsigned reloc_count
;
5301 bfd_vma start_offset
; /* Offset in section. */
5302 unsigned start_ptbl_idx
; /* Offset in the property table. */
5303 unsigned start_reloc_idx
; /* Offset in the relocations. */
5306 unsigned end_ptbl_idx
;
5307 unsigned end_reloc_idx
;
5309 bfd_boolean ends_section
; /* Is this the last ebb in a section? */
5311 /* The unreachable property table at the end of this set of blocks;
5312 NULL if the end is not an unreachable block. */
5313 property_table_entry
*ends_unreachable
;
5317 enum ebb_target_enum
5320 EBB_DESIRE_TGT_ALIGN
,
5321 EBB_REQUIRE_TGT_ALIGN
,
5322 EBB_REQUIRE_LOOP_ALIGN
,
5327 /* proposed_action_struct is similar to the text_action_struct except
5328 that is represents a potential transformation, not one that will
5329 occur. We build a list of these for an extended basic block
5330 and use them to compute the actual actions desired. We must be
5331 careful that the entire set of actual actions we perform do not
5332 break any relocations that would fit if the actions were not
5335 typedef struct proposed_action_struct proposed_action
;
5337 struct proposed_action_struct
5339 enum ebb_target_enum align_type
; /* for the target alignment */
5340 bfd_vma alignment_pow
;
5341 text_action_t action
;
5344 bfd_boolean do_action
; /* If false, then we will not perform the action. */
5348 /* The ebb_constraint_struct keeps a set of proposed actions for an
5349 extended basic block. */
5351 typedef struct ebb_constraint_struct ebb_constraint
;
5353 struct ebb_constraint_struct
5356 bfd_boolean start_movable
;
5358 /* Bytes of extra space at the beginning if movable. */
5359 int start_extra_space
;
5361 enum ebb_target_enum start_align
;
5363 bfd_boolean end_movable
;
5365 /* Bytes of extra space at the end if movable. */
5366 int end_extra_space
;
5368 unsigned action_count
;
5369 unsigned action_allocated
;
5371 /* Array of proposed actions. */
5372 proposed_action
*actions
;
5374 /* Action alignments -- one for each proposed action. */
5375 enum ebb_target_enum
*action_aligns
;
5380 init_ebb_constraint (ebb_constraint
*c
)
5382 memset (c
, 0, sizeof (ebb_constraint
));
5387 free_ebb_constraint (ebb_constraint
*c
)
5395 init_ebb (ebb_t
*ebb
,
5398 bfd_size_type content_length
,
5399 property_table_entry
*prop_table
,
5401 Elf_Internal_Rela
*internal_relocs
,
5402 unsigned reloc_count
)
5404 memset (ebb
, 0, sizeof (ebb_t
));
5406 ebb
->contents
= contents
;
5407 ebb
->content_length
= content_length
;
5408 ebb
->ptbl
= prop_table
;
5409 ebb
->pte_count
= ptblsize
;
5410 ebb
->relocs
= internal_relocs
;
5411 ebb
->reloc_count
= reloc_count
;
5412 ebb
->start_offset
= 0;
5413 ebb
->end_offset
= ebb
->content_length
- 1;
5414 ebb
->start_ptbl_idx
= 0;
5415 ebb
->end_ptbl_idx
= ptblsize
;
5416 ebb
->start_reloc_idx
= 0;
5417 ebb
->end_reloc_idx
= reloc_count
;
5421 /* Extend the ebb to all decodable contiguous sections. The algorithm
5422 for building a basic block around an instruction is to push it
5423 forward until we hit the end of a section, an unreachable block or
5424 a block that cannot be transformed. Then we push it backwards
5425 searching for similar conditions. */
5427 static bfd_boolean
extend_ebb_bounds_forward (ebb_t
*);
5428 static bfd_boolean
extend_ebb_bounds_backward (ebb_t
*);
5429 static bfd_size_type insn_block_decodable_len
5430 (bfd_byte
*, bfd_size_type
, bfd_vma
, bfd_size_type
);
5433 extend_ebb_bounds (ebb_t
*ebb
)
5435 if (!extend_ebb_bounds_forward (ebb
))
5437 if (!extend_ebb_bounds_backward (ebb
))
5444 extend_ebb_bounds_forward (ebb_t
*ebb
)
5446 property_table_entry
*the_entry
, *new_entry
;
5448 the_entry
= &ebb
->ptbl
[ebb
->end_ptbl_idx
];
5450 /* Stop when (1) we cannot decode an instruction, (2) we are at
5451 the end of the property tables, (3) we hit a non-contiguous property
5452 table entry, (4) we hit a NO_TRANSFORM region. */
5457 bfd_size_type insn_block_len
;
5459 entry_end
= the_entry
->address
- ebb
->sec
->vma
+ the_entry
->size
;
5461 insn_block_decodable_len (ebb
->contents
, ebb
->content_length
,
5463 entry_end
- ebb
->end_offset
);
5464 if (insn_block_len
!= (entry_end
- ebb
->end_offset
))
5466 (*_bfd_error_handler
)
5467 (_("%B(%A+0x%lx): could not decode instruction; possible configuration mismatch"),
5468 ebb
->sec
->owner
, ebb
->sec
, ebb
->end_offset
+ insn_block_len
);
5471 ebb
->end_offset
+= insn_block_len
;
5473 if (ebb
->end_offset
== ebb
->sec
->size
)
5474 ebb
->ends_section
= TRUE
;
5476 /* Update the reloc counter. */
5477 while (ebb
->end_reloc_idx
+ 1 < ebb
->reloc_count
5478 && (ebb
->relocs
[ebb
->end_reloc_idx
+ 1].r_offset
5481 ebb
->end_reloc_idx
++;
5484 if (ebb
->end_ptbl_idx
+ 1 == ebb
->pte_count
)
5487 new_entry
= &ebb
->ptbl
[ebb
->end_ptbl_idx
+ 1];
5488 if (((new_entry
->flags
& XTENSA_PROP_INSN
) == 0)
5489 || ((new_entry
->flags
& XTENSA_PROP_INSN_NO_TRANSFORM
) != 0)
5490 || ((the_entry
->flags
& XTENSA_PROP_ALIGN
) != 0))
5493 if (the_entry
->address
+ the_entry
->size
!= new_entry
->address
)
5496 the_entry
= new_entry
;
5497 ebb
->end_ptbl_idx
++;
5500 /* Quick check for an unreachable or end of file just at the end. */
5501 if (ebb
->end_ptbl_idx
+ 1 == ebb
->pte_count
)
5503 if (ebb
->end_offset
== ebb
->content_length
)
5504 ebb
->ends_section
= TRUE
;
5508 new_entry
= &ebb
->ptbl
[ebb
->end_ptbl_idx
+ 1];
5509 if ((new_entry
->flags
& XTENSA_PROP_UNREACHABLE
) != 0
5510 && the_entry
->address
+ the_entry
->size
== new_entry
->address
)
5511 ebb
->ends_unreachable
= new_entry
;
5514 /* Any other ending requires exact alignment. */
5520 extend_ebb_bounds_backward (ebb_t
*ebb
)
5522 property_table_entry
*the_entry
, *new_entry
;
5524 the_entry
= &ebb
->ptbl
[ebb
->start_ptbl_idx
];
5526 /* Stop when (1) we cannot decode the instructions in the current entry.
5527 (2) we are at the beginning of the property tables, (3) we hit a
5528 non-contiguous property table entry, (4) we hit a NO_TRANSFORM region. */
5532 bfd_vma block_begin
;
5533 bfd_size_type insn_block_len
;
5535 block_begin
= the_entry
->address
- ebb
->sec
->vma
;
5537 insn_block_decodable_len (ebb
->contents
, ebb
->content_length
,
5539 ebb
->start_offset
- block_begin
);
5540 if (insn_block_len
!= ebb
->start_offset
- block_begin
)
5542 (*_bfd_error_handler
)
5543 (_("%B(%A+0x%lx): could not decode instruction; possible configuration mismatch"),
5544 ebb
->sec
->owner
, ebb
->sec
, ebb
->end_offset
+ insn_block_len
);
5547 ebb
->start_offset
-= insn_block_len
;
5549 /* Update the reloc counter. */
5550 while (ebb
->start_reloc_idx
> 0
5551 && (ebb
->relocs
[ebb
->start_reloc_idx
- 1].r_offset
5552 >= ebb
->start_offset
))
5554 ebb
->start_reloc_idx
--;
5557 if (ebb
->start_ptbl_idx
== 0)
5560 new_entry
= &ebb
->ptbl
[ebb
->start_ptbl_idx
- 1];
5561 if ((new_entry
->flags
& XTENSA_PROP_INSN
) == 0
5562 || ((new_entry
->flags
& XTENSA_PROP_INSN_NO_TRANSFORM
) != 0)
5563 || ((new_entry
->flags
& XTENSA_PROP_ALIGN
) != 0))
5565 if (new_entry
->address
+ new_entry
->size
!= the_entry
->address
)
5568 the_entry
= new_entry
;
5569 ebb
->start_ptbl_idx
--;
5575 static bfd_size_type
5576 insn_block_decodable_len (bfd_byte
*contents
,
5577 bfd_size_type content_len
,
5578 bfd_vma block_offset
,
5579 bfd_size_type block_len
)
5581 bfd_vma offset
= block_offset
;
5583 while (offset
< block_offset
+ block_len
)
5585 bfd_size_type insn_len
= 0;
5587 insn_len
= insn_decode_len (contents
, content_len
, offset
);
5589 return (offset
- block_offset
);
5592 return (offset
- block_offset
);
5597 ebb_propose_action (ebb_constraint
*c
,
5598 enum ebb_target_enum align_type
,
5599 bfd_vma alignment_pow
,
5600 text_action_t action
,
5603 bfd_boolean do_action
)
5605 proposed_action
*act
;
5607 if (c
->action_allocated
<= c
->action_count
)
5609 unsigned new_allocated
, i
;
5610 proposed_action
*new_actions
;
5612 new_allocated
= (c
->action_count
+ 2) * 2;
5613 new_actions
= (proposed_action
*)
5614 bfd_zmalloc (sizeof (proposed_action
) * new_allocated
);
5616 for (i
= 0; i
< c
->action_count
; i
++)
5617 new_actions
[i
] = c
->actions
[i
];
5620 c
->actions
= new_actions
;
5621 c
->action_allocated
= new_allocated
;
5624 act
= &c
->actions
[c
->action_count
];
5625 act
->align_type
= align_type
;
5626 act
->alignment_pow
= alignment_pow
;
5627 act
->action
= action
;
5628 act
->offset
= offset
;
5629 act
->removed_bytes
= removed_bytes
;
5630 act
->do_action
= do_action
;
5636 /* Access to internal relocations, section contents and symbols. */
5638 /* During relaxation, we need to modify relocations, section contents,
5639 and symbol definitions, and we need to keep the original values from
5640 being reloaded from the input files, i.e., we need to "pin" the
5641 modified values in memory. We also want to continue to observe the
5642 setting of the "keep-memory" flag. The following functions wrap the
5643 standard BFD functions to take care of this for us. */
5645 static Elf_Internal_Rela
*
5646 retrieve_internal_relocs (bfd
*abfd
, asection
*sec
, bfd_boolean keep_memory
)
5648 Elf_Internal_Rela
*internal_relocs
;
5650 if ((sec
->flags
& SEC_LINKER_CREATED
) != 0)
5653 internal_relocs
= elf_section_data (sec
)->relocs
;
5654 if (internal_relocs
== NULL
)
5655 internal_relocs
= (_bfd_elf_link_read_relocs
5656 (abfd
, sec
, NULL
, NULL
, keep_memory
));
5657 return internal_relocs
;
5662 pin_internal_relocs (asection
*sec
, Elf_Internal_Rela
*internal_relocs
)
5664 elf_section_data (sec
)->relocs
= internal_relocs
;
5669 release_internal_relocs (asection
*sec
, Elf_Internal_Rela
*internal_relocs
)
5672 && elf_section_data (sec
)->relocs
!= internal_relocs
)
5673 free (internal_relocs
);
5678 retrieve_contents (bfd
*abfd
, asection
*sec
, bfd_boolean keep_memory
)
5681 bfd_size_type sec_size
;
5683 sec_size
= bfd_get_section_limit (abfd
, sec
);
5684 contents
= elf_section_data (sec
)->this_hdr
.contents
;
5686 if (contents
== NULL
&& sec_size
!= 0)
5688 if (!bfd_malloc_and_get_section (abfd
, sec
, &contents
))
5695 elf_section_data (sec
)->this_hdr
.contents
= contents
;
5702 pin_contents (asection
*sec
, bfd_byte
*contents
)
5704 elf_section_data (sec
)->this_hdr
.contents
= contents
;
5709 release_contents (asection
*sec
, bfd_byte
*contents
)
5711 if (contents
&& elf_section_data (sec
)->this_hdr
.contents
!= contents
)
5716 static Elf_Internal_Sym
*
5717 retrieve_local_syms (bfd
*input_bfd
)
5719 Elf_Internal_Shdr
*symtab_hdr
;
5720 Elf_Internal_Sym
*isymbuf
;
5723 symtab_hdr
= &elf_tdata (input_bfd
)->symtab_hdr
;
5724 locsymcount
= symtab_hdr
->sh_info
;
5726 isymbuf
= (Elf_Internal_Sym
*) symtab_hdr
->contents
;
5727 if (isymbuf
== NULL
&& locsymcount
!= 0)
5728 isymbuf
= bfd_elf_get_elf_syms (input_bfd
, symtab_hdr
, locsymcount
, 0,
5731 /* Save the symbols for this input file so they won't be read again. */
5732 if (isymbuf
&& isymbuf
!= (Elf_Internal_Sym
*) symtab_hdr
->contents
)
5733 symtab_hdr
->contents
= (unsigned char *) isymbuf
;
5739 /* Code for link-time relaxation. */
5741 /* Initialization for relaxation: */
5742 static bfd_boolean
analyze_relocations (struct bfd_link_info
*);
5743 static bfd_boolean find_relaxable_sections
5744 (bfd
*, asection
*, struct bfd_link_info
*, bfd_boolean
*);
5745 static bfd_boolean collect_source_relocs
5746 (bfd
*, asection
*, struct bfd_link_info
*);
5747 static bfd_boolean is_resolvable_asm_expansion
5748 (bfd
*, asection
*, bfd_byte
*, Elf_Internal_Rela
*, struct bfd_link_info
*,
5750 static Elf_Internal_Rela
*find_associated_l32r_irel
5751 (bfd
*, asection
*, bfd_byte
*, Elf_Internal_Rela
*, Elf_Internal_Rela
*);
5752 static bfd_boolean compute_text_actions
5753 (bfd
*, asection
*, struct bfd_link_info
*);
5754 static bfd_boolean
compute_ebb_proposed_actions (ebb_constraint
*);
5755 static bfd_boolean
compute_ebb_actions (ebb_constraint
*);
5756 static bfd_boolean check_section_ebb_pcrels_fit
5757 (bfd
*, asection
*, bfd_byte
*, Elf_Internal_Rela
*, const ebb_constraint
*,
5758 const xtensa_opcode
*);
5759 static bfd_boolean
check_section_ebb_reduces (const ebb_constraint
*);
5760 static void text_action_add_proposed
5761 (text_action_list
*, const ebb_constraint
*, asection
*);
5762 static int compute_fill_extra_space (property_table_entry
*);
5765 static bfd_boolean compute_removed_literals
5766 (bfd
*, asection
*, struct bfd_link_info
*, value_map_hash_table
*);
5767 static Elf_Internal_Rela
*get_irel_at_offset
5768 (asection
*, Elf_Internal_Rela
*, bfd_vma
);
5769 static bfd_boolean is_removable_literal
5770 (const source_reloc
*, int, const source_reloc
*, int);
5771 static bfd_boolean remove_dead_literal
5772 (bfd
*, asection
*, struct bfd_link_info
*, Elf_Internal_Rela
*,
5773 Elf_Internal_Rela
*, source_reloc
*, property_table_entry
*, int);
5774 static bfd_boolean identify_literal_placement
5775 (bfd
*, asection
*, bfd_byte
*, struct bfd_link_info
*,
5776 value_map_hash_table
*, bfd_boolean
*, Elf_Internal_Rela
*, int,
5777 source_reloc
*, property_table_entry
*, int, section_cache_t
*,
5779 static bfd_boolean
relocations_reach (source_reloc
*, int, const r_reloc
*);
5780 static bfd_boolean coalesce_shared_literal
5781 (asection
*, source_reloc
*, property_table_entry
*, int, value_map
*);
5782 static bfd_boolean move_shared_literal
5783 (asection
*, struct bfd_link_info
*, source_reloc
*, property_table_entry
*,
5784 int, const r_reloc
*, const literal_value
*, section_cache_t
*);
5787 static bfd_boolean
relax_section (bfd
*, asection
*, struct bfd_link_info
*);
5788 static bfd_boolean
translate_section_fixes (asection
*);
5789 static bfd_boolean
translate_reloc_bfd_fix (reloc_bfd_fix
*);
5790 static void translate_reloc (const r_reloc
*, r_reloc
*);
5791 static void shrink_dynamic_reloc_sections
5792 (struct bfd_link_info
*, bfd
*, asection
*, Elf_Internal_Rela
*);
5793 static bfd_boolean move_literal
5794 (bfd
*, struct bfd_link_info
*, asection
*, bfd_vma
, bfd_byte
*,
5795 xtensa_relax_info
*, Elf_Internal_Rela
**, const literal_value
*);
5796 static bfd_boolean relax_property_section
5797 (bfd
*, asection
*, struct bfd_link_info
*);
5800 static bfd_boolean
relax_section_symbols (bfd
*, asection
*);
5804 elf_xtensa_relax_section (bfd
*abfd
,
5806 struct bfd_link_info
*link_info
,
5809 static value_map_hash_table
*values
= NULL
;
5810 static bfd_boolean relocations_analyzed
= FALSE
;
5811 xtensa_relax_info
*relax_info
;
5813 if (!relocations_analyzed
)
5815 /* Do some overall initialization for relaxation. */
5816 values
= value_map_hash_table_init ();
5819 relaxing_section
= TRUE
;
5820 if (!analyze_relocations (link_info
))
5822 relocations_analyzed
= TRUE
;
5826 /* Don't mess with linker-created sections. */
5827 if ((sec
->flags
& SEC_LINKER_CREATED
) != 0)
5830 relax_info
= get_xtensa_relax_info (sec
);
5831 BFD_ASSERT (relax_info
!= NULL
);
5833 switch (relax_info
->visited
)
5836 /* Note: It would be nice to fold this pass into
5837 analyze_relocations, but it is important for this step that the
5838 sections be examined in link order. */
5839 if (!compute_removed_literals (abfd
, sec
, link_info
, values
))
5846 value_map_hash_table_delete (values
);
5848 if (!relax_section (abfd
, sec
, link_info
))
5854 if (!relax_section_symbols (abfd
, sec
))
5859 relax_info
->visited
++;
5864 /* Initialization for relaxation. */
5866 /* This function is called once at the start of relaxation. It scans
5867 all the input sections and marks the ones that are relaxable (i.e.,
5868 literal sections with L32R relocations against them), and then
5869 collects source_reloc information for all the relocations against
5870 those relaxable sections. During this process, it also detects
5871 longcalls, i.e., calls relaxed by the assembler into indirect
5872 calls, that can be optimized back into direct calls. Within each
5873 extended basic block (ebb) containing an optimized longcall, it
5874 computes a set of "text actions" that can be performed to remove
5875 the L32R associated with the longcall while optionally preserving
5876 branch target alignments. */
5879 analyze_relocations (struct bfd_link_info
*link_info
)
5883 bfd_boolean is_relaxable
= FALSE
;
5885 /* Initialize the per-section relaxation info. */
5886 for (abfd
= link_info
->input_bfds
; abfd
!= NULL
; abfd
= abfd
->link_next
)
5887 for (sec
= abfd
->sections
; sec
!= NULL
; sec
= sec
->next
)
5889 init_xtensa_relax_info (sec
);
5892 /* Mark relaxable sections (and count relocations against each one). */
5893 for (abfd
= link_info
->input_bfds
; abfd
!= NULL
; abfd
= abfd
->link_next
)
5894 for (sec
= abfd
->sections
; sec
!= NULL
; sec
= sec
->next
)
5896 if (!find_relaxable_sections (abfd
, sec
, link_info
, &is_relaxable
))
5900 /* Bail out if there are no relaxable sections. */
5904 /* Allocate space for source_relocs. */
5905 for (abfd
= link_info
->input_bfds
; abfd
!= NULL
; abfd
= abfd
->link_next
)
5906 for (sec
= abfd
->sections
; sec
!= NULL
; sec
= sec
->next
)
5908 xtensa_relax_info
*relax_info
;
5910 relax_info
= get_xtensa_relax_info (sec
);
5911 if (relax_info
->is_relaxable_literal_section
5912 || relax_info
->is_relaxable_asm_section
)
5914 relax_info
->src_relocs
= (source_reloc
*)
5915 bfd_malloc (relax_info
->src_count
* sizeof (source_reloc
));
5918 relax_info
->src_count
= 0;
5921 /* Collect info on relocations against each relaxable section. */
5922 for (abfd
= link_info
->input_bfds
; abfd
!= NULL
; abfd
= abfd
->link_next
)
5923 for (sec
= abfd
->sections
; sec
!= NULL
; sec
= sec
->next
)
5925 if (!collect_source_relocs (abfd
, sec
, link_info
))
5929 /* Compute the text actions. */
5930 for (abfd
= link_info
->input_bfds
; abfd
!= NULL
; abfd
= abfd
->link_next
)
5931 for (sec
= abfd
->sections
; sec
!= NULL
; sec
= sec
->next
)
5933 if (!compute_text_actions (abfd
, sec
, link_info
))
5941 /* Find all the sections that might be relaxed. The motivation for
5942 this pass is that collect_source_relocs() needs to record _all_ the
5943 relocations that target each relaxable section. That is expensive
5944 and unnecessary unless the target section is actually going to be
5945 relaxed. This pass identifies all such sections by checking if
5946 they have L32Rs pointing to them. In the process, the total number
5947 of relocations targeting each section is also counted so that we
5948 know how much space to allocate for source_relocs against each
5949 relaxable literal section. */
5952 find_relaxable_sections (bfd
*abfd
,
5954 struct bfd_link_info
*link_info
,
5955 bfd_boolean
*is_relaxable_p
)
5957 Elf_Internal_Rela
*internal_relocs
;
5959 bfd_boolean ok
= TRUE
;
5961 xtensa_relax_info
*source_relax_info
;
5962 bfd_boolean is_l32r_reloc
;
5964 internal_relocs
= retrieve_internal_relocs (abfd
, sec
,
5965 link_info
->keep_memory
);
5966 if (internal_relocs
== NULL
)
5969 contents
= retrieve_contents (abfd
, sec
, link_info
->keep_memory
);
5970 if (contents
== NULL
&& sec
->size
!= 0)
5976 source_relax_info
= get_xtensa_relax_info (sec
);
5977 for (i
= 0; i
< sec
->reloc_count
; i
++)
5979 Elf_Internal_Rela
*irel
= &internal_relocs
[i
];
5981 asection
*target_sec
;
5982 xtensa_relax_info
*target_relax_info
;
5984 /* If this section has not already been marked as "relaxable", and
5985 if it contains any ASM_EXPAND relocations (marking expanded
5986 longcalls) that can be optimized into direct calls, then mark
5987 the section as "relaxable". */
5988 if (source_relax_info
5989 && !source_relax_info
->is_relaxable_asm_section
5990 && ELF32_R_TYPE (irel
->r_info
) == R_XTENSA_ASM_EXPAND
)
5992 bfd_boolean is_reachable
= FALSE
;
5993 if (is_resolvable_asm_expansion (abfd
, sec
, contents
, irel
,
5994 link_info
, &is_reachable
)
5997 source_relax_info
->is_relaxable_asm_section
= TRUE
;
5998 *is_relaxable_p
= TRUE
;
6002 r_reloc_init (&r_rel
, abfd
, irel
, contents
,
6003 bfd_get_section_limit (abfd
, sec
));
6005 target_sec
= r_reloc_get_section (&r_rel
);
6006 target_relax_info
= get_xtensa_relax_info (target_sec
);
6007 if (!target_relax_info
)
6010 /* Count PC-relative operand relocations against the target section.
6011 Note: The conditions tested here must match the conditions under
6012 which init_source_reloc is called in collect_source_relocs(). */
6013 is_l32r_reloc
= FALSE
;
6014 if (is_operand_relocation (ELF32_R_TYPE (irel
->r_info
)))
6016 xtensa_opcode opcode
=
6017 get_relocation_opcode (abfd
, sec
, contents
, irel
);
6018 if (opcode
!= XTENSA_UNDEFINED
)
6020 is_l32r_reloc
= (opcode
== get_l32r_opcode ());
6021 if (!is_alt_relocation (ELF32_R_TYPE (irel
->r_info
))
6023 target_relax_info
->src_count
++;
6027 if (is_l32r_reloc
&& r_reloc_is_defined (&r_rel
))
6029 /* Mark the target section as relaxable. */
6030 target_relax_info
->is_relaxable_literal_section
= TRUE
;
6031 *is_relaxable_p
= TRUE
;
6036 release_contents (sec
, contents
);
6037 release_internal_relocs (sec
, internal_relocs
);
6042 /* Record _all_ the relocations that point to relaxable sections, and
6043 get rid of ASM_EXPAND relocs by either converting them to
6044 ASM_SIMPLIFY or by removing them. */
6047 collect_source_relocs (bfd
*abfd
,
6049 struct bfd_link_info
*link_info
)
6051 Elf_Internal_Rela
*internal_relocs
;
6053 bfd_boolean ok
= TRUE
;
6055 bfd_size_type sec_size
;
6057 internal_relocs
= retrieve_internal_relocs (abfd
, sec
,
6058 link_info
->keep_memory
);
6059 if (internal_relocs
== NULL
)
6062 sec_size
= bfd_get_section_limit (abfd
, sec
);
6063 contents
= retrieve_contents (abfd
, sec
, link_info
->keep_memory
);
6064 if (contents
== NULL
&& sec_size
!= 0)
6070 /* Record relocations against relaxable literal sections. */
6071 for (i
= 0; i
< sec
->reloc_count
; i
++)
6073 Elf_Internal_Rela
*irel
= &internal_relocs
[i
];
6075 asection
*target_sec
;
6076 xtensa_relax_info
*target_relax_info
;
6078 r_reloc_init (&r_rel
, abfd
, irel
, contents
, sec_size
);
6080 target_sec
= r_reloc_get_section (&r_rel
);
6081 target_relax_info
= get_xtensa_relax_info (target_sec
);
6083 if (target_relax_info
6084 && (target_relax_info
->is_relaxable_literal_section
6085 || target_relax_info
->is_relaxable_asm_section
))
6087 xtensa_opcode opcode
= XTENSA_UNDEFINED
;
6089 bfd_boolean is_abs_literal
= FALSE
;
6091 if (is_alt_relocation (ELF32_R_TYPE (irel
->r_info
)))
6093 /* None of the current alternate relocs are PC-relative,
6094 and only PC-relative relocs matter here. However, we
6095 still need to record the opcode for literal
6097 opcode
= get_relocation_opcode (abfd
, sec
, contents
, irel
);
6098 if (opcode
== get_l32r_opcode ())
6100 is_abs_literal
= TRUE
;
6104 opcode
= XTENSA_UNDEFINED
;
6106 else if (is_operand_relocation (ELF32_R_TYPE (irel
->r_info
)))
6108 opcode
= get_relocation_opcode (abfd
, sec
, contents
, irel
);
6109 opnd
= get_relocation_opnd (opcode
, ELF32_R_TYPE (irel
->r_info
));
6112 if (opcode
!= XTENSA_UNDEFINED
)
6114 int src_next
= target_relax_info
->src_next
++;
6115 source_reloc
*s_reloc
= &target_relax_info
->src_relocs
[src_next
];
6117 init_source_reloc (s_reloc
, sec
, &r_rel
, opcode
, opnd
,
6123 /* Now get rid of ASM_EXPAND relocations. At this point, the
6124 src_relocs array for the target literal section may still be
6125 incomplete, but it must at least contain the entries for the L32R
6126 relocations associated with ASM_EXPANDs because they were just
6127 added in the preceding loop over the relocations. */
6129 for (i
= 0; i
< sec
->reloc_count
; i
++)
6131 Elf_Internal_Rela
*irel
= &internal_relocs
[i
];
6132 bfd_boolean is_reachable
;
6134 if (!is_resolvable_asm_expansion (abfd
, sec
, contents
, irel
, link_info
,
6140 Elf_Internal_Rela
*l32r_irel
;
6142 asection
*target_sec
;
6143 xtensa_relax_info
*target_relax_info
;
6145 /* Mark the source_reloc for the L32R so that it will be
6146 removed in compute_removed_literals(), along with the
6147 associated literal. */
6148 l32r_irel
= find_associated_l32r_irel (abfd
, sec
, contents
,
6149 irel
, internal_relocs
);
6150 if (l32r_irel
== NULL
)
6153 r_reloc_init (&r_rel
, abfd
, l32r_irel
, contents
, sec_size
);
6155 target_sec
= r_reloc_get_section (&r_rel
);
6156 target_relax_info
= get_xtensa_relax_info (target_sec
);
6158 if (target_relax_info
6159 && (target_relax_info
->is_relaxable_literal_section
6160 || target_relax_info
->is_relaxable_asm_section
))
6162 source_reloc
*s_reloc
;
6164 /* Search the source_relocs for the entry corresponding to
6165 the l32r_irel. Note: The src_relocs array is not yet
6166 sorted, but it wouldn't matter anyway because we're
6167 searching by source offset instead of target offset. */
6168 s_reloc
= find_source_reloc (target_relax_info
->src_relocs
,
6169 target_relax_info
->src_next
,
6171 BFD_ASSERT (s_reloc
);
6172 s_reloc
->is_null
= TRUE
;
6175 /* Convert this reloc to ASM_SIMPLIFY. */
6176 irel
->r_info
= ELF32_R_INFO (ELF32_R_SYM (irel
->r_info
),
6177 R_XTENSA_ASM_SIMPLIFY
);
6178 l32r_irel
->r_info
= ELF32_R_INFO (0, R_XTENSA_NONE
);
6180 pin_internal_relocs (sec
, internal_relocs
);
6184 /* It is resolvable but doesn't reach. We resolve now
6185 by eliminating the relocation -- the call will remain
6186 expanded into L32R/CALLX. */
6187 irel
->r_info
= ELF32_R_INFO (0, R_XTENSA_NONE
);
6188 pin_internal_relocs (sec
, internal_relocs
);
6193 release_contents (sec
, contents
);
6194 release_internal_relocs (sec
, internal_relocs
);
6199 /* Return TRUE if the asm expansion can be resolved. Generally it can
6200 be resolved on a final link or when a partial link locates it in the
6201 same section as the target. Set "is_reachable" flag if the target of
6202 the call is within the range of a direct call, given the current VMA
6203 for this section and the target section. */
6206 is_resolvable_asm_expansion (bfd
*abfd
,
6209 Elf_Internal_Rela
*irel
,
6210 struct bfd_link_info
*link_info
,
6211 bfd_boolean
*is_reachable_p
)
6213 asection
*target_sec
;
6214 bfd_vma target_offset
;
6216 xtensa_opcode opcode
, direct_call_opcode
;
6217 bfd_vma self_address
;
6218 bfd_vma dest_address
;
6219 bfd_boolean uses_l32r
;
6220 bfd_size_type sec_size
;
6222 *is_reachable_p
= FALSE
;
6224 if (contents
== NULL
)
6227 if (ELF32_R_TYPE (irel
->r_info
) != R_XTENSA_ASM_EXPAND
)
6230 sec_size
= bfd_get_section_limit (abfd
, sec
);
6231 opcode
= get_expanded_call_opcode (contents
+ irel
->r_offset
,
6232 sec_size
- irel
->r_offset
, &uses_l32r
);
6233 /* Optimization of longcalls that use CONST16 is not yet implemented. */
6237 direct_call_opcode
= swap_callx_for_call_opcode (opcode
);
6238 if (direct_call_opcode
== XTENSA_UNDEFINED
)
6241 /* Check and see that the target resolves. */
6242 r_reloc_init (&r_rel
, abfd
, irel
, contents
, sec_size
);
6243 if (!r_reloc_is_defined (&r_rel
))
6246 target_sec
= r_reloc_get_section (&r_rel
);
6247 target_offset
= r_rel
.target_offset
;
6249 /* If the target is in a shared library, then it doesn't reach. This
6250 isn't supposed to come up because the compiler should never generate
6251 non-PIC calls on systems that use shared libraries, but the linker
6252 shouldn't crash regardless. */
6253 if (!target_sec
->output_section
)
6256 /* For relocatable sections, we can only simplify when the output
6257 section of the target is the same as the output section of the
6259 if (link_info
->relocatable
6260 && (target_sec
->output_section
!= sec
->output_section
6261 || is_reloc_sym_weak (abfd
, irel
)))
6264 self_address
= (sec
->output_section
->vma
6265 + sec
->output_offset
+ irel
->r_offset
+ 3);
6266 dest_address
= (target_sec
->output_section
->vma
6267 + target_sec
->output_offset
+ target_offset
);
6269 *is_reachable_p
= pcrel_reloc_fits (direct_call_opcode
, 0,
6270 self_address
, dest_address
);
6272 if ((self_address
>> CALL_SEGMENT_BITS
) !=
6273 (dest_address
>> CALL_SEGMENT_BITS
))
6280 static Elf_Internal_Rela
*
6281 find_associated_l32r_irel (bfd
*abfd
,
6284 Elf_Internal_Rela
*other_irel
,
6285 Elf_Internal_Rela
*internal_relocs
)
6289 for (i
= 0; i
< sec
->reloc_count
; i
++)
6291 Elf_Internal_Rela
*irel
= &internal_relocs
[i
];
6293 if (irel
== other_irel
)
6295 if (irel
->r_offset
!= other_irel
->r_offset
)
6297 if (is_l32r_relocation (abfd
, sec
, contents
, irel
))
6305 static xtensa_opcode
*
6306 build_reloc_opcodes (bfd
*abfd
,
6309 Elf_Internal_Rela
*internal_relocs
)
6312 xtensa_opcode
*reloc_opcodes
=
6313 (xtensa_opcode
*) bfd_malloc (sizeof (xtensa_opcode
) * sec
->reloc_count
);
6314 for (i
= 0; i
< sec
->reloc_count
; i
++)
6316 Elf_Internal_Rela
*irel
= &internal_relocs
[i
];
6317 reloc_opcodes
[i
] = get_relocation_opcode (abfd
, sec
, contents
, irel
);
6319 return reloc_opcodes
;
6323 /* The compute_text_actions function will build a list of potential
6324 transformation actions for code in the extended basic block of each
6325 longcall that is optimized to a direct call. From this list we
6326 generate a set of actions to actually perform that optimizes for
6327 space and, if not using size_opt, maintains branch target
6330 These actions to be performed are placed on a per-section list.
6331 The actual changes are performed by relax_section() in the second
6335 compute_text_actions (bfd
*abfd
,
6337 struct bfd_link_info
*link_info
)
6339 xtensa_opcode
*reloc_opcodes
= NULL
;
6340 xtensa_relax_info
*relax_info
;
6342 Elf_Internal_Rela
*internal_relocs
;
6343 bfd_boolean ok
= TRUE
;
6345 property_table_entry
*prop_table
= 0;
6347 bfd_size_type sec_size
;
6349 relax_info
= get_xtensa_relax_info (sec
);
6350 BFD_ASSERT (relax_info
);
6351 BFD_ASSERT (relax_info
->src_next
== relax_info
->src_count
);
6353 /* Do nothing if the section contains no optimized longcalls. */
6354 if (!relax_info
->is_relaxable_asm_section
)
6357 internal_relocs
= retrieve_internal_relocs (abfd
, sec
,
6358 link_info
->keep_memory
);
6360 if (internal_relocs
)
6361 qsort (internal_relocs
, sec
->reloc_count
, sizeof (Elf_Internal_Rela
),
6362 internal_reloc_compare
);
6364 sec_size
= bfd_get_section_limit (abfd
, sec
);
6365 contents
= retrieve_contents (abfd
, sec
, link_info
->keep_memory
);
6366 if (contents
== NULL
&& sec_size
!= 0)
6372 ptblsize
= xtensa_read_table_entries (abfd
, sec
, &prop_table
,
6373 XTENSA_PROP_SEC_NAME
, FALSE
);
6380 for (i
= 0; i
< sec
->reloc_count
; i
++)
6382 Elf_Internal_Rela
*irel
= &internal_relocs
[i
];
6384 property_table_entry
*the_entry
;
6387 ebb_constraint ebb_table
;
6388 bfd_size_type simplify_size
;
6390 if (irel
&& ELF32_R_TYPE (irel
->r_info
) != R_XTENSA_ASM_SIMPLIFY
)
6392 r_offset
= irel
->r_offset
;
6394 simplify_size
= get_asm_simplify_size (contents
, sec_size
, r_offset
);
6395 if (simplify_size
== 0)
6397 (*_bfd_error_handler
)
6398 (_("%B(%A+0x%lx): could not decode instruction for XTENSA_ASM_SIMPLIFY relocation; possible configuration mismatch"),
6399 sec
->owner
, sec
, r_offset
);
6403 /* If the instruction table is not around, then don't do this
6405 the_entry
= elf_xtensa_find_property_entry (prop_table
, ptblsize
,
6406 sec
->vma
+ irel
->r_offset
);
6407 if (the_entry
== NULL
|| XTENSA_NO_NOP_REMOVAL
)
6409 text_action_add (&relax_info
->action_list
,
6410 ta_convert_longcall
, sec
, r_offset
,
6415 /* If the next longcall happens to be at the same address as an
6416 unreachable section of size 0, then skip forward. */
6417 ptbl_idx
= the_entry
- prop_table
;
6418 while ((the_entry
->flags
& XTENSA_PROP_UNREACHABLE
)
6419 && the_entry
->size
== 0
6420 && ptbl_idx
+ 1 < ptblsize
6421 && (prop_table
[ptbl_idx
+ 1].address
6422 == prop_table
[ptbl_idx
].address
))
6428 if (the_entry
->flags
& XTENSA_PROP_INSN_NO_TRANSFORM
)
6429 /* NO_REORDER is OK */
6432 init_ebb_constraint (&ebb_table
);
6433 ebb
= &ebb_table
.ebb
;
6434 init_ebb (ebb
, sec
, contents
, sec_size
, prop_table
, ptblsize
,
6435 internal_relocs
, sec
->reloc_count
);
6436 ebb
->start_offset
= r_offset
+ simplify_size
;
6437 ebb
->end_offset
= r_offset
+ simplify_size
;
6438 ebb
->start_ptbl_idx
= ptbl_idx
;
6439 ebb
->end_ptbl_idx
= ptbl_idx
;
6440 ebb
->start_reloc_idx
= i
;
6441 ebb
->end_reloc_idx
= i
;
6443 /* Precompute the opcode for each relocation. */
6444 if (reloc_opcodes
== NULL
)
6445 reloc_opcodes
= build_reloc_opcodes (abfd
, sec
, contents
,
6448 if (!extend_ebb_bounds (ebb
)
6449 || !compute_ebb_proposed_actions (&ebb_table
)
6450 || !compute_ebb_actions (&ebb_table
)
6451 || !check_section_ebb_pcrels_fit (abfd
, sec
, contents
,
6452 internal_relocs
, &ebb_table
,
6454 || !check_section_ebb_reduces (&ebb_table
))
6456 /* If anything goes wrong or we get unlucky and something does
6457 not fit, with our plan because of expansion between
6458 critical branches, just convert to a NOP. */
6460 text_action_add (&relax_info
->action_list
,
6461 ta_convert_longcall
, sec
, r_offset
, 0);
6462 i
= ebb_table
.ebb
.end_reloc_idx
;
6463 free_ebb_constraint (&ebb_table
);
6467 text_action_add_proposed (&relax_info
->action_list
, &ebb_table
, sec
);
6469 /* Update the index so we do not go looking at the relocations
6470 we have already processed. */
6471 i
= ebb_table
.ebb
.end_reloc_idx
;
6472 free_ebb_constraint (&ebb_table
);
6476 if (relax_info
->action_list
.head
)
6477 print_action_list (stderr
, &relax_info
->action_list
);
6481 release_contents (sec
, contents
);
6482 release_internal_relocs (sec
, internal_relocs
);
6486 free (reloc_opcodes
);
6492 /* Do not widen an instruction if it is preceeded by a
6493 loop opcode. It might cause misalignment. */
6496 prev_instr_is_a_loop (bfd_byte
*contents
,
6497 bfd_size_type content_length
,
6498 bfd_size_type offset
)
6500 xtensa_opcode prev_opcode
;
6504 prev_opcode
= insn_decode_opcode (contents
, content_length
, offset
-3, 0);
6505 return (xtensa_opcode_is_loop (xtensa_default_isa
, prev_opcode
) == 1);
6509 /* Find all of the possible actions for an extended basic block. */
6512 compute_ebb_proposed_actions (ebb_constraint
*ebb_table
)
6514 const ebb_t
*ebb
= &ebb_table
->ebb
;
6515 unsigned rel_idx
= ebb
->start_reloc_idx
;
6516 property_table_entry
*entry
, *start_entry
, *end_entry
;
6518 xtensa_isa isa
= xtensa_default_isa
;
6520 static xtensa_insnbuf insnbuf
= NULL
;
6521 static xtensa_insnbuf slotbuf
= NULL
;
6523 if (insnbuf
== NULL
)
6525 insnbuf
= xtensa_insnbuf_alloc (isa
);
6526 slotbuf
= xtensa_insnbuf_alloc (isa
);
6529 start_entry
= &ebb
->ptbl
[ebb
->start_ptbl_idx
];
6530 end_entry
= &ebb
->ptbl
[ebb
->end_ptbl_idx
];
6532 for (entry
= start_entry
; entry
<= end_entry
; entry
++)
6534 bfd_vma start_offset
, end_offset
;
6535 bfd_size_type insn_len
;
6537 start_offset
= entry
->address
- ebb
->sec
->vma
;
6538 end_offset
= entry
->address
+ entry
->size
- ebb
->sec
->vma
;
6540 if (entry
== start_entry
)
6541 start_offset
= ebb
->start_offset
;
6542 if (entry
== end_entry
)
6543 end_offset
= ebb
->end_offset
;
6544 offset
= start_offset
;
6546 if (offset
== entry
->address
- ebb
->sec
->vma
6547 && (entry
->flags
& XTENSA_PROP_INSN_BRANCH_TARGET
) != 0)
6549 enum ebb_target_enum align_type
= EBB_DESIRE_TGT_ALIGN
;
6550 BFD_ASSERT (offset
!= end_offset
);
6551 if (offset
== end_offset
)
6554 insn_len
= insn_decode_len (ebb
->contents
, ebb
->content_length
,
6559 if (check_branch_target_aligned_address (offset
, insn_len
))
6560 align_type
= EBB_REQUIRE_TGT_ALIGN
;
6562 ebb_propose_action (ebb_table
, align_type
, 0,
6563 ta_none
, offset
, 0, TRUE
);
6566 while (offset
!= end_offset
)
6568 Elf_Internal_Rela
*irel
;
6569 xtensa_opcode opcode
;
6571 while (rel_idx
< ebb
->end_reloc_idx
6572 && (ebb
->relocs
[rel_idx
].r_offset
< offset
6573 || (ebb
->relocs
[rel_idx
].r_offset
== offset
6574 && (ELF32_R_TYPE (ebb
->relocs
[rel_idx
].r_info
)
6575 != R_XTENSA_ASM_SIMPLIFY
))))
6578 /* Check for longcall. */
6579 irel
= &ebb
->relocs
[rel_idx
];
6580 if (irel
->r_offset
== offset
6581 && ELF32_R_TYPE (irel
->r_info
) == R_XTENSA_ASM_SIMPLIFY
)
6583 bfd_size_type simplify_size
;
6585 simplify_size
= get_asm_simplify_size (ebb
->contents
,
6586 ebb
->content_length
,
6588 if (simplify_size
== 0)
6591 ebb_propose_action (ebb_table
, EBB_NO_ALIGN
, 0,
6592 ta_convert_longcall
, offset
, 0, TRUE
);
6594 offset
+= simplify_size
;
6598 if (offset
+ MIN_INSN_LENGTH
> ebb
->content_length
)
6600 xtensa_insnbuf_from_chars (isa
, insnbuf
, &ebb
->contents
[offset
],
6601 ebb
->content_length
- offset
);
6602 fmt
= xtensa_format_decode (isa
, insnbuf
);
6603 if (fmt
== XTENSA_UNDEFINED
)
6605 insn_len
= xtensa_format_length (isa
, fmt
);
6606 if (insn_len
== (bfd_size_type
) XTENSA_UNDEFINED
)
6609 if (xtensa_format_num_slots (isa
, fmt
) != 1)
6615 xtensa_format_get_slot (isa
, fmt
, 0, insnbuf
, slotbuf
);
6616 opcode
= xtensa_opcode_decode (isa
, fmt
, 0, slotbuf
);
6617 if (opcode
== XTENSA_UNDEFINED
)
6620 if ((entry
->flags
& XTENSA_PROP_INSN_NO_DENSITY
) == 0
6621 && (entry
->flags
& XTENSA_PROP_INSN_NO_TRANSFORM
) == 0
6622 && can_narrow_instruction (slotbuf
, fmt
, opcode
) != 0)
6624 /* Add an instruction narrow action. */
6625 ebb_propose_action (ebb_table
, EBB_NO_ALIGN
, 0,
6626 ta_narrow_insn
, offset
, 0, FALSE
);
6628 else if ((entry
->flags
& XTENSA_PROP_INSN_NO_TRANSFORM
) == 0
6629 && can_widen_instruction (slotbuf
, fmt
, opcode
) != 0
6630 && ! prev_instr_is_a_loop (ebb
->contents
,
6631 ebb
->content_length
, offset
))
6633 /* Add an instruction widen action. */
6634 ebb_propose_action (ebb_table
, EBB_NO_ALIGN
, 0,
6635 ta_widen_insn
, offset
, 0, FALSE
);
6637 else if (xtensa_opcode_is_loop (xtensa_default_isa
, opcode
) == 1)
6639 /* Check for branch targets. */
6640 ebb_propose_action (ebb_table
, EBB_REQUIRE_LOOP_ALIGN
, 0,
6641 ta_none
, offset
, 0, TRUE
);
6648 if (ebb
->ends_unreachable
)
6650 ebb_propose_action (ebb_table
, EBB_NO_ALIGN
, 0,
6651 ta_fill
, ebb
->end_offset
, 0, TRUE
);
6657 (*_bfd_error_handler
)
6658 (_("%B(%A+0x%lx): could not decode instruction; possible configuration mismatch"),
6659 ebb
->sec
->owner
, ebb
->sec
, offset
);
6664 /* After all of the information has collected about the
6665 transformations possible in an EBB, compute the appropriate actions
6666 here in compute_ebb_actions. We still must check later to make
6667 sure that the actions do not break any relocations. The algorithm
6668 used here is pretty greedy. Basically, it removes as many no-ops
6669 as possible so that the end of the EBB has the same alignment
6670 characteristics as the original. First, it uses narrowing, then
6671 fill space at the end of the EBB, and finally widenings. If that
6672 does not work, it tries again with one fewer no-op removed. The
6673 optimization will only be performed if all of the branch targets
6674 that were aligned before transformation are also aligned after the
6677 When the size_opt flag is set, ignore the branch target alignments,
6678 narrow all wide instructions, and remove all no-ops unless the end
6679 of the EBB prevents it. */
6682 compute_ebb_actions (ebb_constraint
*ebb_table
)
6686 int removed_bytes
= 0;
6687 ebb_t
*ebb
= &ebb_table
->ebb
;
6688 unsigned seg_idx_start
= 0;
6689 unsigned seg_idx_end
= 0;
6691 /* We perform this like the assembler relaxation algorithm: Start by
6692 assuming all instructions are narrow and all no-ops removed; then
6695 /* For each segment of this that has a solid constraint, check to
6696 see if there are any combinations that will keep the constraint.
6698 for (seg_idx_end
= 0; seg_idx_end
< ebb_table
->action_count
; seg_idx_end
++)
6700 bfd_boolean requires_text_end_align
= FALSE
;
6701 unsigned longcall_count
= 0;
6702 unsigned longcall_convert_count
= 0;
6703 unsigned narrowable_count
= 0;
6704 unsigned narrowable_convert_count
= 0;
6705 unsigned widenable_count
= 0;
6706 unsigned widenable_convert_count
= 0;
6708 proposed_action
*action
= NULL
;
6709 int align
= (1 << ebb_table
->ebb
.sec
->alignment_power
);
6711 seg_idx_start
= seg_idx_end
;
6713 for (i
= seg_idx_start
; i
< ebb_table
->action_count
; i
++)
6715 action
= &ebb_table
->actions
[i
];
6716 if (action
->action
== ta_convert_longcall
)
6718 if (action
->action
== ta_narrow_insn
)
6720 if (action
->action
== ta_widen_insn
)
6722 if (action
->action
== ta_fill
)
6724 if (action
->align_type
== EBB_REQUIRE_LOOP_ALIGN
)
6726 if (action
->align_type
== EBB_REQUIRE_TGT_ALIGN
6727 && !elf32xtensa_size_opt
)
6732 if (seg_idx_end
== ebb_table
->action_count
&& !ebb
->ends_unreachable
)
6733 requires_text_end_align
= TRUE
;
6735 if (elf32xtensa_size_opt
&& !requires_text_end_align
6736 && action
->align_type
!= EBB_REQUIRE_LOOP_ALIGN
6737 && action
->align_type
!= EBB_REQUIRE_TGT_ALIGN
)
6739 longcall_convert_count
= longcall_count
;
6740 narrowable_convert_count
= narrowable_count
;
6741 widenable_convert_count
= 0;
6745 /* There is a constraint. Convert the max number of longcalls. */
6746 narrowable_convert_count
= 0;
6747 longcall_convert_count
= 0;
6748 widenable_convert_count
= 0;
6750 for (j
= 0; j
< longcall_count
; j
++)
6752 int removed
= (longcall_count
- j
) * 3 & (align
- 1);
6753 unsigned desire_narrow
= (align
- removed
) & (align
- 1);
6754 unsigned desire_widen
= removed
;
6755 if (desire_narrow
<= narrowable_count
)
6757 narrowable_convert_count
= desire_narrow
;
6758 narrowable_convert_count
+=
6759 (align
* ((narrowable_count
- narrowable_convert_count
)
6761 longcall_convert_count
= (longcall_count
- j
);
6762 widenable_convert_count
= 0;
6765 if (desire_widen
<= widenable_count
&& !elf32xtensa_size_opt
)
6767 narrowable_convert_count
= 0;
6768 longcall_convert_count
= longcall_count
- j
;
6769 widenable_convert_count
= desire_widen
;
6775 /* Now the number of conversions are saved. Do them. */
6776 for (i
= seg_idx_start
; i
< seg_idx_end
; i
++)
6778 action
= &ebb_table
->actions
[i
];
6779 switch (action
->action
)
6781 case ta_convert_longcall
:
6782 if (longcall_convert_count
!= 0)
6784 action
->action
= ta_remove_longcall
;
6785 action
->do_action
= TRUE
;
6786 action
->removed_bytes
+= 3;
6787 longcall_convert_count
--;
6790 case ta_narrow_insn
:
6791 if (narrowable_convert_count
!= 0)
6793 action
->do_action
= TRUE
;
6794 action
->removed_bytes
+= 1;
6795 narrowable_convert_count
--;
6799 if (widenable_convert_count
!= 0)
6801 action
->do_action
= TRUE
;
6802 action
->removed_bytes
-= 1;
6803 widenable_convert_count
--;
6812 /* Now we move on to some local opts. Try to remove each of the
6813 remaining longcalls. */
6815 if (ebb_table
->ebb
.ends_section
|| ebb_table
->ebb
.ends_unreachable
)
6818 for (i
= 0; i
< ebb_table
->action_count
; i
++)
6820 int old_removed_bytes
= removed_bytes
;
6821 proposed_action
*action
= &ebb_table
->actions
[i
];
6823 if (action
->do_action
&& action
->action
== ta_convert_longcall
)
6825 bfd_boolean bad_alignment
= FALSE
;
6827 for (j
= i
+ 1; j
< ebb_table
->action_count
; j
++)
6829 proposed_action
*new_action
= &ebb_table
->actions
[j
];
6830 bfd_vma offset
= new_action
->offset
;
6831 if (new_action
->align_type
== EBB_REQUIRE_TGT_ALIGN
)
6833 if (!check_branch_target_aligned
6834 (ebb_table
->ebb
.contents
,
6835 ebb_table
->ebb
.content_length
,
6836 offset
, offset
- removed_bytes
))
6838 bad_alignment
= TRUE
;
6842 if (new_action
->align_type
== EBB_REQUIRE_LOOP_ALIGN
)
6844 if (!check_loop_aligned (ebb_table
->ebb
.contents
,
6845 ebb_table
->ebb
.content_length
,
6847 offset
- removed_bytes
))
6849 bad_alignment
= TRUE
;
6853 if (new_action
->action
== ta_narrow_insn
6854 && !new_action
->do_action
6855 && ebb_table
->ebb
.sec
->alignment_power
== 2)
6857 /* Narrow an instruction and we are done. */
6858 new_action
->do_action
= TRUE
;
6859 new_action
->removed_bytes
+= 1;
6860 bad_alignment
= FALSE
;
6863 if (new_action
->action
== ta_widen_insn
6864 && new_action
->do_action
6865 && ebb_table
->ebb
.sec
->alignment_power
== 2)
6867 /* Narrow an instruction and we are done. */
6868 new_action
->do_action
= FALSE
;
6869 new_action
->removed_bytes
+= 1;
6870 bad_alignment
= FALSE
;
6876 action
->removed_bytes
+= 3;
6877 action
->action
= ta_remove_longcall
;
6878 action
->do_action
= TRUE
;
6881 removed_bytes
= old_removed_bytes
;
6882 if (action
->do_action
)
6883 removed_bytes
+= action
->removed_bytes
;
6888 for (i
= 0; i
< ebb_table
->action_count
; ++i
)
6890 proposed_action
*action
= &ebb_table
->actions
[i
];
6891 if (action
->do_action
)
6892 removed_bytes
+= action
->removed_bytes
;
6895 if ((removed_bytes
% (1 << ebb_table
->ebb
.sec
->alignment_power
)) != 0
6896 && ebb
->ends_unreachable
)
6898 proposed_action
*action
;
6902 BFD_ASSERT (ebb_table
->action_count
!= 0);
6903 action
= &ebb_table
->actions
[ebb_table
->action_count
- 1];
6904 BFD_ASSERT (action
->action
== ta_fill
);
6905 BFD_ASSERT (ebb
->ends_unreachable
->flags
& XTENSA_PROP_UNREACHABLE
);
6907 extra_space
= compute_fill_extra_space (ebb
->ends_unreachable
);
6908 br
= action
->removed_bytes
+ removed_bytes
+ extra_space
;
6909 br
= br
& ((1 << ebb
->sec
->alignment_power
) - 1);
6911 action
->removed_bytes
= extra_space
- br
;
6917 /* The xlate_map is a sorted array of address mappings designed to
6918 answer the offset_with_removed_text() query with a binary search instead
6919 of a linear search through the section's action_list. */
6921 typedef struct xlate_map_entry xlate_map_entry_t
;
6922 typedef struct xlate_map xlate_map_t
;
6924 struct xlate_map_entry
6926 unsigned orig_address
;
6927 unsigned new_address
;
6933 unsigned entry_count
;
6934 xlate_map_entry_t
*entry
;
6939 xlate_compare (const void *a_v
, const void *b_v
)
6941 const xlate_map_entry_t
*a
= (const xlate_map_entry_t
*) a_v
;
6942 const xlate_map_entry_t
*b
= (const xlate_map_entry_t
*) b_v
;
6943 if (a
->orig_address
< b
->orig_address
)
6945 if (a
->orig_address
> (b
->orig_address
+ b
->size
- 1))
6952 xlate_offset_with_removed_text (const xlate_map_t
*map
,
6953 text_action_list
*action_list
,
6956 xlate_map_entry_t tmp
;
6958 xlate_map_entry_t
*e
;
6961 return offset_with_removed_text (action_list
, offset
);
6963 if (map
->entry_count
== 0)
6966 tmp
.orig_address
= offset
;
6967 tmp
.new_address
= offset
;
6970 r
= bsearch (&offset
, map
->entry
, map
->entry_count
,
6971 sizeof (xlate_map_entry_t
), &xlate_compare
);
6972 e
= (xlate_map_entry_t
*) r
;
6974 BFD_ASSERT (e
!= NULL
);
6977 return e
->new_address
- e
->orig_address
+ offset
;
6981 /* Build a binary searchable offset translation map from a section's
6984 static xlate_map_t
*
6985 build_xlate_map (asection
*sec
, xtensa_relax_info
*relax_info
)
6987 xlate_map_t
*map
= (xlate_map_t
*) bfd_malloc (sizeof (xlate_map_t
));
6988 text_action_list
*action_list
= &relax_info
->action_list
;
6989 unsigned num_actions
= 0;
6992 xlate_map_entry_t
*current_entry
;
6997 num_actions
= action_list_count (action_list
);
6998 map
->entry
= (xlate_map_entry_t
*)
6999 bfd_malloc (sizeof (xlate_map_entry_t
) * (num_actions
+ 1));
7000 if (map
->entry
== NULL
)
7005 map
->entry_count
= 0;
7008 current_entry
= &map
->entry
[0];
7010 current_entry
->orig_address
= 0;
7011 current_entry
->new_address
= 0;
7012 current_entry
->size
= 0;
7014 for (r
= action_list
->head
; r
!= NULL
; r
= r
->next
)
7016 unsigned orig_size
= 0;
7020 case ta_remove_insn
:
7021 case ta_convert_longcall
:
7022 case ta_remove_literal
:
7023 case ta_add_literal
:
7025 case ta_remove_longcall
:
7028 case ta_narrow_insn
:
7037 current_entry
->size
=
7038 r
->offset
+ orig_size
- current_entry
->orig_address
;
7039 if (current_entry
->size
!= 0)
7044 current_entry
->orig_address
= r
->offset
+ orig_size
;
7045 removed
+= r
->removed_bytes
;
7046 current_entry
->new_address
= r
->offset
+ orig_size
- removed
;
7047 current_entry
->size
= 0;
7050 current_entry
->size
= (bfd_get_section_limit (sec
->owner
, sec
)
7051 - current_entry
->orig_address
);
7052 if (current_entry
->size
!= 0)
7059 /* Free an offset translation map. */
7062 free_xlate_map (xlate_map_t
*map
)
7064 if (map
&& map
->entry
)
7071 /* Use check_section_ebb_pcrels_fit to make sure that all of the
7072 relocations in a section will fit if a proposed set of actions
7076 check_section_ebb_pcrels_fit (bfd
*abfd
,
7079 Elf_Internal_Rela
*internal_relocs
,
7080 const ebb_constraint
*constraint
,
7081 const xtensa_opcode
*reloc_opcodes
)
7084 Elf_Internal_Rela
*irel
;
7085 xlate_map_t
*xmap
= NULL
;
7086 bfd_boolean ok
= TRUE
;
7087 xtensa_relax_info
*relax_info
;
7089 relax_info
= get_xtensa_relax_info (sec
);
7091 if (relax_info
&& sec
->reloc_count
> 100)
7093 xmap
= build_xlate_map (sec
, relax_info
);
7094 /* NULL indicates out of memory, but the slow version
7095 can still be used. */
7098 for (i
= 0; i
< sec
->reloc_count
; i
++)
7101 bfd_vma orig_self_offset
, orig_target_offset
;
7102 bfd_vma self_offset
, target_offset
;
7104 reloc_howto_type
*howto
;
7105 int self_removed_bytes
, target_removed_bytes
;
7107 irel
= &internal_relocs
[i
];
7108 r_type
= ELF32_R_TYPE (irel
->r_info
);
7110 howto
= &elf_howto_table
[r_type
];
7111 /* We maintain the required invariant: PC-relative relocations
7112 that fit before linking must fit after linking. Thus we only
7113 need to deal with relocations to the same section that are
7115 if (ELF32_R_TYPE (irel
->r_info
) == R_XTENSA_ASM_SIMPLIFY
7116 || !howto
->pc_relative
)
7119 r_reloc_init (&r_rel
, abfd
, irel
, contents
,
7120 bfd_get_section_limit (abfd
, sec
));
7122 if (r_reloc_get_section (&r_rel
) != sec
)
7125 orig_self_offset
= irel
->r_offset
;
7126 orig_target_offset
= r_rel
.target_offset
;
7128 self_offset
= orig_self_offset
;
7129 target_offset
= orig_target_offset
;
7134 xlate_offset_with_removed_text (xmap
, &relax_info
->action_list
,
7137 xlate_offset_with_removed_text (xmap
, &relax_info
->action_list
,
7138 orig_target_offset
);
7141 self_removed_bytes
= 0;
7142 target_removed_bytes
= 0;
7144 for (j
= 0; j
< constraint
->action_count
; ++j
)
7146 proposed_action
*action
= &constraint
->actions
[j
];
7147 bfd_vma offset
= action
->offset
;
7148 int removed_bytes
= action
->removed_bytes
;
7149 if (offset
< orig_self_offset
7150 || (offset
== orig_self_offset
&& action
->action
== ta_fill
7151 && action
->removed_bytes
< 0))
7152 self_removed_bytes
+= removed_bytes
;
7153 if (offset
< orig_target_offset
7154 || (offset
== orig_target_offset
&& action
->action
== ta_fill
7155 && action
->removed_bytes
< 0))
7156 target_removed_bytes
+= removed_bytes
;
7158 self_offset
-= self_removed_bytes
;
7159 target_offset
-= target_removed_bytes
;
7161 /* Try to encode it. Get the operand and check. */
7162 if (is_alt_relocation (ELF32_R_TYPE (irel
->r_info
)))
7164 /* None of the current alternate relocs are PC-relative,
7165 and only PC-relative relocs matter here. */
7169 xtensa_opcode opcode
;
7173 opcode
= reloc_opcodes
[i
];
7175 opcode
= get_relocation_opcode (abfd
, sec
, contents
, irel
);
7176 if (opcode
== XTENSA_UNDEFINED
)
7182 opnum
= get_relocation_opnd (opcode
, ELF32_R_TYPE (irel
->r_info
));
7183 if (opnum
== XTENSA_UNDEFINED
)
7189 if (!pcrel_reloc_fits (opcode
, opnum
, self_offset
, target_offset
))
7198 free_xlate_map (xmap
);
7205 check_section_ebb_reduces (const ebb_constraint
*constraint
)
7210 for (i
= 0; i
< constraint
->action_count
; i
++)
7212 const proposed_action
*action
= &constraint
->actions
[i
];
7213 if (action
->do_action
)
7214 removed
+= action
->removed_bytes
;
7224 text_action_add_proposed (text_action_list
*l
,
7225 const ebb_constraint
*ebb_table
,
7230 for (i
= 0; i
< ebb_table
->action_count
; i
++)
7232 proposed_action
*action
= &ebb_table
->actions
[i
];
7234 if (!action
->do_action
)
7236 switch (action
->action
)
7238 case ta_remove_insn
:
7239 case ta_remove_longcall
:
7240 case ta_convert_longcall
:
7241 case ta_narrow_insn
:
7244 case ta_remove_literal
:
7245 text_action_add (l
, action
->action
, sec
, action
->offset
,
7246 action
->removed_bytes
);
7259 compute_fill_extra_space (property_table_entry
*entry
)
7261 int fill_extra_space
;
7266 if ((entry
->flags
& XTENSA_PROP_UNREACHABLE
) == 0)
7269 fill_extra_space
= entry
->size
;
7270 if ((entry
->flags
& XTENSA_PROP_ALIGN
) != 0)
7272 /* Fill bytes for alignment:
7273 (2**n)-1 - (addr + (2**n)-1) & (2**n -1) */
7274 int pow
= GET_XTENSA_PROP_ALIGNMENT (entry
->flags
);
7275 int nsm
= (1 << pow
) - 1;
7276 bfd_vma addr
= entry
->address
+ entry
->size
;
7277 bfd_vma align_fill
= nsm
- ((addr
+ nsm
) & nsm
);
7278 fill_extra_space
+= align_fill
;
7280 return fill_extra_space
;
7284 /* First relaxation pass. */
7286 /* If the section contains relaxable literals, check each literal to
7287 see if it has the same value as another literal that has already
7288 been seen, either in the current section or a previous one. If so,
7289 add an entry to the per-section list of removed literals. The
7290 actual changes are deferred until the next pass. */
7293 compute_removed_literals (bfd
*abfd
,
7295 struct bfd_link_info
*link_info
,
7296 value_map_hash_table
*values
)
7298 xtensa_relax_info
*relax_info
;
7300 Elf_Internal_Rela
*internal_relocs
;
7301 source_reloc
*src_relocs
, *rel
;
7302 bfd_boolean ok
= TRUE
;
7303 property_table_entry
*prop_table
= NULL
;
7306 bfd_boolean last_loc_is_prev
= FALSE
;
7307 bfd_vma last_target_offset
= 0;
7308 section_cache_t target_sec_cache
;
7309 bfd_size_type sec_size
;
7311 init_section_cache (&target_sec_cache
);
7313 /* Do nothing if it is not a relaxable literal section. */
7314 relax_info
= get_xtensa_relax_info (sec
);
7315 BFD_ASSERT (relax_info
);
7316 if (!relax_info
->is_relaxable_literal_section
)
7319 internal_relocs
= retrieve_internal_relocs (abfd
, sec
,
7320 link_info
->keep_memory
);
7322 sec_size
= bfd_get_section_limit (abfd
, sec
);
7323 contents
= retrieve_contents (abfd
, sec
, link_info
->keep_memory
);
7324 if (contents
== NULL
&& sec_size
!= 0)
7330 /* Sort the source_relocs by target offset. */
7331 src_relocs
= relax_info
->src_relocs
;
7332 qsort (src_relocs
, relax_info
->src_count
,
7333 sizeof (source_reloc
), source_reloc_compare
);
7334 qsort (internal_relocs
, sec
->reloc_count
, sizeof (Elf_Internal_Rela
),
7335 internal_reloc_compare
);
7337 ptblsize
= xtensa_read_table_entries (abfd
, sec
, &prop_table
,
7338 XTENSA_PROP_SEC_NAME
, FALSE
);
7346 for (i
= 0; i
< relax_info
->src_count
; i
++)
7348 Elf_Internal_Rela
*irel
= NULL
;
7350 rel
= &src_relocs
[i
];
7351 if (get_l32r_opcode () != rel
->opcode
)
7353 irel
= get_irel_at_offset (sec
, internal_relocs
,
7354 rel
->r_rel
.target_offset
);
7356 /* If the relocation on this is not a simple R_XTENSA_32 or
7357 R_XTENSA_PLT then do not consider it. This may happen when
7358 the difference of two symbols is used in a literal. */
7359 if (irel
&& (ELF32_R_TYPE (irel
->r_info
) != R_XTENSA_32
7360 && ELF32_R_TYPE (irel
->r_info
) != R_XTENSA_PLT
))
7363 /* If the target_offset for this relocation is the same as the
7364 previous relocation, then we've already considered whether the
7365 literal can be coalesced. Skip to the next one.... */
7366 if (i
!= 0 && prev_i
!= -1
7367 && src_relocs
[i
-1].r_rel
.target_offset
== rel
->r_rel
.target_offset
)
7371 if (last_loc_is_prev
&&
7372 last_target_offset
+ 4 != rel
->r_rel
.target_offset
)
7373 last_loc_is_prev
= FALSE
;
7375 /* Check if the relocation was from an L32R that is being removed
7376 because a CALLX was converted to a direct CALL, and check if
7377 there are no other relocations to the literal. */
7378 if (is_removable_literal (rel
, i
, src_relocs
, relax_info
->src_count
))
7380 if (!remove_dead_literal (abfd
, sec
, link_info
, internal_relocs
,
7381 irel
, rel
, prop_table
, ptblsize
))
7386 last_target_offset
= rel
->r_rel
.target_offset
;
7390 if (!identify_literal_placement (abfd
, sec
, contents
, link_info
,
7392 &last_loc_is_prev
, irel
,
7393 relax_info
->src_count
- i
, rel
,
7394 prop_table
, ptblsize
,
7395 &target_sec_cache
, rel
->is_abs_literal
))
7400 last_target_offset
= rel
->r_rel
.target_offset
;
7404 print_removed_literals (stderr
, &relax_info
->removed_list
);
7405 print_action_list (stderr
, &relax_info
->action_list
);
7409 if (prop_table
) free (prop_table
);
7410 clear_section_cache (&target_sec_cache
);
7412 release_contents (sec
, contents
);
7413 release_internal_relocs (sec
, internal_relocs
);
7418 static Elf_Internal_Rela
*
7419 get_irel_at_offset (asection
*sec
,
7420 Elf_Internal_Rela
*internal_relocs
,
7424 Elf_Internal_Rela
*irel
;
7426 Elf_Internal_Rela key
;
7428 if (!internal_relocs
)
7431 key
.r_offset
= offset
;
7432 irel
= bsearch (&key
, internal_relocs
, sec
->reloc_count
,
7433 sizeof (Elf_Internal_Rela
), internal_reloc_matches
);
7437 /* bsearch does not guarantee which will be returned if there are
7438 multiple matches. We need the first that is not an alignment. */
7439 i
= irel
- internal_relocs
;
7442 if (internal_relocs
[i
-1].r_offset
!= offset
)
7446 for ( ; i
< sec
->reloc_count
; i
++)
7448 irel
= &internal_relocs
[i
];
7449 r_type
= ELF32_R_TYPE (irel
->r_info
);
7450 if (irel
->r_offset
== offset
&& r_type
!= R_XTENSA_NONE
)
7459 is_removable_literal (const source_reloc
*rel
,
7461 const source_reloc
*src_relocs
,
7464 const source_reloc
*curr_rel
;
7468 for (++i
; i
< src_count
; ++i
)
7470 curr_rel
= &src_relocs
[i
];
7471 /* If all others have the same target offset.... */
7472 if (curr_rel
->r_rel
.target_offset
!= rel
->r_rel
.target_offset
)
7475 if (!curr_rel
->is_null
7476 && !xtensa_is_property_section (curr_rel
->source_sec
)
7477 && !(curr_rel
->source_sec
->flags
& SEC_DEBUGGING
))
7485 remove_dead_literal (bfd
*abfd
,
7487 struct bfd_link_info
*link_info
,
7488 Elf_Internal_Rela
*internal_relocs
,
7489 Elf_Internal_Rela
*irel
,
7491 property_table_entry
*prop_table
,
7494 property_table_entry
*entry
;
7495 xtensa_relax_info
*relax_info
;
7497 relax_info
= get_xtensa_relax_info (sec
);
7501 entry
= elf_xtensa_find_property_entry (prop_table
, ptblsize
,
7502 sec
->vma
+ rel
->r_rel
.target_offset
);
7504 /* Mark the unused literal so that it will be removed. */
7505 add_removed_literal (&relax_info
->removed_list
, &rel
->r_rel
, NULL
);
7507 text_action_add (&relax_info
->action_list
,
7508 ta_remove_literal
, sec
, rel
->r_rel
.target_offset
, 4);
7510 /* If the section is 4-byte aligned, do not add fill. */
7511 if (sec
->alignment_power
> 2)
7513 int fill_extra_space
;
7514 bfd_vma entry_sec_offset
;
7516 property_table_entry
*the_add_entry
;
7520 entry_sec_offset
= entry
->address
- sec
->vma
+ entry
->size
;
7522 entry_sec_offset
= rel
->r_rel
.target_offset
+ 4;
7524 /* If the literal range is at the end of the section,
7526 the_add_entry
= elf_xtensa_find_property_entry (prop_table
, ptblsize
,
7528 fill_extra_space
= compute_fill_extra_space (the_add_entry
);
7530 fa
= find_fill_action (&relax_info
->action_list
, sec
, entry_sec_offset
);
7531 removed_diff
= compute_removed_action_diff (fa
, sec
, entry_sec_offset
,
7532 -4, fill_extra_space
);
7534 adjust_fill_action (fa
, removed_diff
);
7536 text_action_add (&relax_info
->action_list
,
7537 ta_fill
, sec
, entry_sec_offset
, removed_diff
);
7540 /* Zero out the relocation on this literal location. */
7543 if (elf_hash_table (link_info
)->dynamic_sections_created
)
7544 shrink_dynamic_reloc_sections (link_info
, abfd
, sec
, irel
);
7546 irel
->r_info
= ELF32_R_INFO (0, R_XTENSA_NONE
);
7547 pin_internal_relocs (sec
, internal_relocs
);
7550 /* Do not modify "last_loc_is_prev". */
7556 identify_literal_placement (bfd
*abfd
,
7559 struct bfd_link_info
*link_info
,
7560 value_map_hash_table
*values
,
7561 bfd_boolean
*last_loc_is_prev_p
,
7562 Elf_Internal_Rela
*irel
,
7563 int remaining_src_rels
,
7565 property_table_entry
*prop_table
,
7567 section_cache_t
*target_sec_cache
,
7568 bfd_boolean is_abs_literal
)
7572 xtensa_relax_info
*relax_info
;
7573 bfd_boolean literal_placed
= FALSE
;
7575 unsigned long value
;
7576 bfd_boolean final_static_link
;
7577 bfd_size_type sec_size
;
7579 relax_info
= get_xtensa_relax_info (sec
);
7583 sec_size
= bfd_get_section_limit (abfd
, sec
);
7586 (!link_info
->relocatable
7587 && !elf_hash_table (link_info
)->dynamic_sections_created
);
7589 /* The placement algorithm first checks to see if the literal is
7590 already in the value map. If so and the value map is reachable
7591 from all uses, then the literal is moved to that location. If
7592 not, then we identify the last location where a fresh literal was
7593 placed. If the literal can be safely moved there, then we do so.
7594 If not, then we assume that the literal is not to move and leave
7595 the literal where it is, marking it as the last literal
7598 /* Find the literal value. */
7600 r_reloc_init (&r_rel
, abfd
, irel
, contents
, sec_size
);
7603 BFD_ASSERT (rel
->r_rel
.target_offset
< sec_size
);
7604 value
= bfd_get_32 (abfd
, contents
+ rel
->r_rel
.target_offset
);
7606 init_literal_value (&val
, &r_rel
, value
, is_abs_literal
);
7608 /* Check if we've seen another literal with the same value that
7609 is in the same output section. */
7610 val_map
= value_map_get_cached_value (values
, &val
, final_static_link
);
7613 && (r_reloc_get_section (&val_map
->loc
)->output_section
7614 == sec
->output_section
)
7615 && relocations_reach (rel
, remaining_src_rels
, &val_map
->loc
)
7616 && coalesce_shared_literal (sec
, rel
, prop_table
, ptblsize
, val_map
))
7618 /* No change to last_loc_is_prev. */
7619 literal_placed
= TRUE
;
7622 /* For relocatable links, do not try to move literals. To do it
7623 correctly might increase the number of relocations in an input
7624 section making the default relocatable linking fail. */
7625 if (!link_info
->relocatable
&& !literal_placed
7626 && values
->has_last_loc
&& !(*last_loc_is_prev_p
))
7628 asection
*target_sec
= r_reloc_get_section (&values
->last_loc
);
7629 if (target_sec
&& target_sec
->output_section
== sec
->output_section
)
7631 /* Increment the virtual offset. */
7632 r_reloc try_loc
= values
->last_loc
;
7633 try_loc
.virtual_offset
+= 4;
7635 /* There is a last loc that was in the same output section. */
7636 if (relocations_reach (rel
, remaining_src_rels
, &try_loc
)
7637 && move_shared_literal (sec
, link_info
, rel
,
7638 prop_table
, ptblsize
,
7639 &try_loc
, &val
, target_sec_cache
))
7641 values
->last_loc
.virtual_offset
+= 4;
7642 literal_placed
= TRUE
;
7644 val_map
= add_value_map (values
, &val
, &try_loc
,
7647 val_map
->loc
= try_loc
;
7652 if (!literal_placed
)
7654 /* Nothing worked, leave the literal alone but update the last loc. */
7655 values
->has_last_loc
= TRUE
;
7656 values
->last_loc
= rel
->r_rel
;
7658 val_map
= add_value_map (values
, &val
, &rel
->r_rel
, final_static_link
);
7660 val_map
->loc
= rel
->r_rel
;
7661 *last_loc_is_prev_p
= TRUE
;
7668 /* Check if the original relocations (presumably on L32R instructions)
7669 identified by reloc[0..N] can be changed to reference the literal
7670 identified by r_rel. If r_rel is out of range for any of the
7671 original relocations, then we don't want to coalesce the original
7672 literal with the one at r_rel. We only check reloc[0..N], where the
7673 offsets are all the same as for reloc[0] (i.e., they're all
7674 referencing the same literal) and where N is also bounded by the
7675 number of remaining entries in the "reloc" array. The "reloc" array
7676 is sorted by target offset so we know all the entries for the same
7677 literal will be contiguous. */
7680 relocations_reach (source_reloc
*reloc
,
7681 int remaining_relocs
,
7682 const r_reloc
*r_rel
)
7684 bfd_vma from_offset
, source_address
, dest_address
;
7688 if (!r_reloc_is_defined (r_rel
))
7691 sec
= r_reloc_get_section (r_rel
);
7692 from_offset
= reloc
[0].r_rel
.target_offset
;
7694 for (i
= 0; i
< remaining_relocs
; i
++)
7696 if (reloc
[i
].r_rel
.target_offset
!= from_offset
)
7699 /* Ignore relocations that have been removed. */
7700 if (reloc
[i
].is_null
)
7703 /* The original and new output section for these must be the same
7704 in order to coalesce. */
7705 if (r_reloc_get_section (&reloc
[i
].r_rel
)->output_section
7706 != sec
->output_section
)
7709 /* Absolute literals in the same output section can always be
7711 if (reloc
[i
].is_abs_literal
)
7714 /* A literal with no PC-relative relocations can be moved anywhere. */
7715 if (reloc
[i
].opnd
!= -1)
7717 /* Otherwise, check to see that it fits. */
7718 source_address
= (reloc
[i
].source_sec
->output_section
->vma
7719 + reloc
[i
].source_sec
->output_offset
7720 + reloc
[i
].r_rel
.rela
.r_offset
);
7721 dest_address
= (sec
->output_section
->vma
7722 + sec
->output_offset
7723 + r_rel
->target_offset
);
7725 if (!pcrel_reloc_fits (reloc
[i
].opcode
, reloc
[i
].opnd
,
7726 source_address
, dest_address
))
7735 /* Move a literal to another literal location because it is
7736 the same as the other literal value. */
7739 coalesce_shared_literal (asection
*sec
,
7741 property_table_entry
*prop_table
,
7745 property_table_entry
*entry
;
7747 property_table_entry
*the_add_entry
;
7749 xtensa_relax_info
*relax_info
;
7751 relax_info
= get_xtensa_relax_info (sec
);
7755 entry
= elf_xtensa_find_property_entry
7756 (prop_table
, ptblsize
, sec
->vma
+ rel
->r_rel
.target_offset
);
7757 if (entry
&& (entry
->flags
& XTENSA_PROP_INSN_NO_TRANSFORM
))
7760 /* Mark that the literal will be coalesced. */
7761 add_removed_literal (&relax_info
->removed_list
, &rel
->r_rel
, &val_map
->loc
);
7763 text_action_add (&relax_info
->action_list
,
7764 ta_remove_literal
, sec
, rel
->r_rel
.target_offset
, 4);
7766 /* If the section is 4-byte aligned, do not add fill. */
7767 if (sec
->alignment_power
> 2)
7769 int fill_extra_space
;
7770 bfd_vma entry_sec_offset
;
7773 entry_sec_offset
= entry
->address
- sec
->vma
+ entry
->size
;
7775 entry_sec_offset
= rel
->r_rel
.target_offset
+ 4;
7777 /* If the literal range is at the end of the section,
7779 fill_extra_space
= 0;
7780 the_add_entry
= elf_xtensa_find_property_entry (prop_table
, ptblsize
,
7782 if (the_add_entry
&& (the_add_entry
->flags
& XTENSA_PROP_UNREACHABLE
))
7783 fill_extra_space
= the_add_entry
->size
;
7785 fa
= find_fill_action (&relax_info
->action_list
, sec
, entry_sec_offset
);
7786 removed_diff
= compute_removed_action_diff (fa
, sec
, entry_sec_offset
,
7787 -4, fill_extra_space
);
7789 adjust_fill_action (fa
, removed_diff
);
7791 text_action_add (&relax_info
->action_list
,
7792 ta_fill
, sec
, entry_sec_offset
, removed_diff
);
7799 /* Move a literal to another location. This may actually increase the
7800 total amount of space used because of alignments so we need to do
7801 this carefully. Also, it may make a branch go out of range. */
7804 move_shared_literal (asection
*sec
,
7805 struct bfd_link_info
*link_info
,
7807 property_table_entry
*prop_table
,
7809 const r_reloc
*target_loc
,
7810 const literal_value
*lit_value
,
7811 section_cache_t
*target_sec_cache
)
7813 property_table_entry
*the_add_entry
, *src_entry
, *target_entry
= NULL
;
7814 text_action
*fa
, *target_fa
;
7816 xtensa_relax_info
*relax_info
, *target_relax_info
;
7817 asection
*target_sec
;
7819 ebb_constraint ebb_table
;
7820 bfd_boolean relocs_fit
;
7822 /* If this routine always returns FALSE, the literals that cannot be
7823 coalesced will not be moved. */
7824 if (elf32xtensa_no_literal_movement
)
7827 relax_info
= get_xtensa_relax_info (sec
);
7831 target_sec
= r_reloc_get_section (target_loc
);
7832 target_relax_info
= get_xtensa_relax_info (target_sec
);
7834 /* Literals to undefined sections may not be moved because they
7835 must report an error. */
7836 if (bfd_is_und_section (target_sec
))
7839 src_entry
= elf_xtensa_find_property_entry
7840 (prop_table
, ptblsize
, sec
->vma
+ rel
->r_rel
.target_offset
);
7842 if (!section_cache_section (target_sec_cache
, target_sec
, link_info
))
7845 target_entry
= elf_xtensa_find_property_entry
7846 (target_sec_cache
->ptbl
, target_sec_cache
->pte_count
,
7847 target_sec
->vma
+ target_loc
->target_offset
);
7852 /* Make sure that we have not broken any branches. */
7855 init_ebb_constraint (&ebb_table
);
7856 ebb
= &ebb_table
.ebb
;
7857 init_ebb (ebb
, target_sec_cache
->sec
, target_sec_cache
->contents
,
7858 target_sec_cache
->content_length
,
7859 target_sec_cache
->ptbl
, target_sec_cache
->pte_count
,
7860 target_sec_cache
->relocs
, target_sec_cache
->reloc_count
);
7862 /* Propose to add 4 bytes + worst-case alignment size increase to
7864 ebb_propose_action (&ebb_table
, EBB_NO_ALIGN
, 0,
7865 ta_fill
, target_loc
->target_offset
,
7866 -4 - (1 << target_sec
->alignment_power
), TRUE
);
7868 /* Check all of the PC-relative relocations to make sure they still fit. */
7869 relocs_fit
= check_section_ebb_pcrels_fit (target_sec
->owner
, target_sec
,
7870 target_sec_cache
->contents
,
7871 target_sec_cache
->relocs
,
7877 text_action_add_literal (&target_relax_info
->action_list
,
7878 ta_add_literal
, target_loc
, lit_value
, -4);
7880 if (target_sec
->alignment_power
> 2 && target_entry
!= src_entry
)
7882 /* May need to add or remove some fill to maintain alignment. */
7883 int fill_extra_space
;
7884 bfd_vma entry_sec_offset
;
7887 target_entry
->address
- target_sec
->vma
+ target_entry
->size
;
7889 /* If the literal range is at the end of the section,
7891 fill_extra_space
= 0;
7893 elf_xtensa_find_property_entry (target_sec_cache
->ptbl
,
7894 target_sec_cache
->pte_count
,
7896 if (the_add_entry
&& (the_add_entry
->flags
& XTENSA_PROP_UNREACHABLE
))
7897 fill_extra_space
= the_add_entry
->size
;
7899 target_fa
= find_fill_action (&target_relax_info
->action_list
,
7900 target_sec
, entry_sec_offset
);
7901 removed_diff
= compute_removed_action_diff (target_fa
, target_sec
,
7902 entry_sec_offset
, 4,
7905 adjust_fill_action (target_fa
, removed_diff
);
7907 text_action_add (&target_relax_info
->action_list
,
7908 ta_fill
, target_sec
, entry_sec_offset
, removed_diff
);
7911 /* Mark that the literal will be moved to the new location. */
7912 add_removed_literal (&relax_info
->removed_list
, &rel
->r_rel
, target_loc
);
7914 /* Remove the literal. */
7915 text_action_add (&relax_info
->action_list
,
7916 ta_remove_literal
, sec
, rel
->r_rel
.target_offset
, 4);
7918 /* If the section is 4-byte aligned, do not add fill. */
7919 if (sec
->alignment_power
> 2 && target_entry
!= src_entry
)
7921 int fill_extra_space
;
7922 bfd_vma entry_sec_offset
;
7925 entry_sec_offset
= src_entry
->address
- sec
->vma
+ src_entry
->size
;
7927 entry_sec_offset
= rel
->r_rel
.target_offset
+4;
7929 /* If the literal range is at the end of the section,
7931 fill_extra_space
= 0;
7932 the_add_entry
= elf_xtensa_find_property_entry (prop_table
, ptblsize
,
7934 if (the_add_entry
&& (the_add_entry
->flags
& XTENSA_PROP_UNREACHABLE
))
7935 fill_extra_space
= the_add_entry
->size
;
7937 fa
= find_fill_action (&relax_info
->action_list
, sec
, entry_sec_offset
);
7938 removed_diff
= compute_removed_action_diff (fa
, sec
, entry_sec_offset
,
7939 -4, fill_extra_space
);
7941 adjust_fill_action (fa
, removed_diff
);
7943 text_action_add (&relax_info
->action_list
,
7944 ta_fill
, sec
, entry_sec_offset
, removed_diff
);
7951 /* Second relaxation pass. */
7953 /* Modify all of the relocations to point to the right spot, and if this
7954 is a relaxable section, delete the unwanted literals and fix the
7958 relax_section (bfd
*abfd
, asection
*sec
, struct bfd_link_info
*link_info
)
7960 Elf_Internal_Rela
*internal_relocs
;
7961 xtensa_relax_info
*relax_info
;
7963 bfd_boolean ok
= TRUE
;
7965 bfd_boolean rv
= FALSE
;
7966 bfd_boolean virtual_action
;
7967 bfd_size_type sec_size
;
7969 sec_size
= bfd_get_section_limit (abfd
, sec
);
7970 relax_info
= get_xtensa_relax_info (sec
);
7971 BFD_ASSERT (relax_info
);
7973 /* First translate any of the fixes that have been added already. */
7974 translate_section_fixes (sec
);
7976 /* Handle property sections (e.g., literal tables) specially. */
7977 if (xtensa_is_property_section (sec
))
7979 BFD_ASSERT (!relax_info
->is_relaxable_literal_section
);
7980 return relax_property_section (abfd
, sec
, link_info
);
7983 internal_relocs
= retrieve_internal_relocs (abfd
, sec
,
7984 link_info
->keep_memory
);
7985 contents
= retrieve_contents (abfd
, sec
, link_info
->keep_memory
);
7986 if (contents
== NULL
&& sec_size
!= 0)
7992 if (internal_relocs
)
7994 for (i
= 0; i
< sec
->reloc_count
; i
++)
7996 Elf_Internal_Rela
*irel
;
7997 xtensa_relax_info
*target_relax_info
;
7998 bfd_vma source_offset
, old_source_offset
;
8001 asection
*target_sec
;
8003 /* Locally change the source address.
8004 Translate the target to the new target address.
8005 If it points to this section and has been removed,
8009 irel
= &internal_relocs
[i
];
8010 source_offset
= irel
->r_offset
;
8011 old_source_offset
= source_offset
;
8013 r_type
= ELF32_R_TYPE (irel
->r_info
);
8014 r_reloc_init (&r_rel
, abfd
, irel
, contents
,
8015 bfd_get_section_limit (abfd
, sec
));
8017 /* If this section could have changed then we may need to
8018 change the relocation's offset. */
8020 if (relax_info
->is_relaxable_literal_section
8021 || relax_info
->is_relaxable_asm_section
)
8023 if (r_type
!= R_XTENSA_NONE
8024 && find_removed_literal (&relax_info
->removed_list
,
8027 /* Remove this relocation. */
8028 if (elf_hash_table (link_info
)->dynamic_sections_created
)
8029 shrink_dynamic_reloc_sections (link_info
, abfd
, sec
, irel
);
8030 irel
->r_info
= ELF32_R_INFO (0, R_XTENSA_NONE
);
8031 irel
->r_offset
= offset_with_removed_text
8032 (&relax_info
->action_list
, irel
->r_offset
);
8033 pin_internal_relocs (sec
, internal_relocs
);
8037 if (r_type
== R_XTENSA_ASM_SIMPLIFY
)
8039 text_action
*action
=
8040 find_insn_action (&relax_info
->action_list
,
8042 if (action
&& (action
->action
== ta_convert_longcall
8043 || action
->action
== ta_remove_longcall
))
8045 bfd_reloc_status_type retval
;
8046 char *error_message
= NULL
;
8048 retval
= contract_asm_expansion (contents
, sec_size
,
8049 irel
, &error_message
);
8050 if (retval
!= bfd_reloc_ok
)
8052 (*link_info
->callbacks
->reloc_dangerous
)
8053 (link_info
, error_message
, abfd
, sec
,
8057 /* Update the action so that the code that moves
8058 the contents will do the right thing. */
8059 if (action
->action
== ta_remove_longcall
)
8060 action
->action
= ta_remove_insn
;
8062 action
->action
= ta_none
;
8063 /* Refresh the info in the r_rel. */
8064 r_reloc_init (&r_rel
, abfd
, irel
, contents
, sec_size
);
8065 r_type
= ELF32_R_TYPE (irel
->r_info
);
8069 source_offset
= offset_with_removed_text
8070 (&relax_info
->action_list
, irel
->r_offset
);
8071 irel
->r_offset
= source_offset
;
8074 /* If the target section could have changed then
8075 we may need to change the relocation's target offset. */
8077 target_sec
= r_reloc_get_section (&r_rel
);
8078 target_relax_info
= get_xtensa_relax_info (target_sec
);
8080 if (target_relax_info
8081 && (target_relax_info
->is_relaxable_literal_section
8082 || target_relax_info
->is_relaxable_asm_section
))
8086 bfd_vma addend_displacement
;
8088 translate_reloc (&r_rel
, &new_reloc
);
8090 if (r_type
== R_XTENSA_DIFF8
8091 || r_type
== R_XTENSA_DIFF16
8092 || r_type
== R_XTENSA_DIFF32
)
8094 bfd_vma diff_value
= 0, new_end_offset
, diff_mask
= 0;
8096 if (bfd_get_section_limit (abfd
, sec
) < old_source_offset
)
8098 (*link_info
->callbacks
->reloc_dangerous
)
8099 (link_info
, _("invalid relocation address"),
8100 abfd
, sec
, old_source_offset
);
8106 case R_XTENSA_DIFF8
:
8108 bfd_get_8 (abfd
, &contents
[old_source_offset
]);
8110 case R_XTENSA_DIFF16
:
8112 bfd_get_16 (abfd
, &contents
[old_source_offset
]);
8114 case R_XTENSA_DIFF32
:
8116 bfd_get_32 (abfd
, &contents
[old_source_offset
]);
8120 new_end_offset
= offset_with_removed_text
8121 (&target_relax_info
->action_list
,
8122 r_rel
.target_offset
+ diff_value
);
8123 diff_value
= new_end_offset
- new_reloc
.target_offset
;
8127 case R_XTENSA_DIFF8
:
8129 bfd_put_8 (abfd
, diff_value
,
8130 &contents
[old_source_offset
]);
8132 case R_XTENSA_DIFF16
:
8134 bfd_put_16 (abfd
, diff_value
,
8135 &contents
[old_source_offset
]);
8137 case R_XTENSA_DIFF32
:
8138 diff_mask
= 0xffffffff;
8139 bfd_put_32 (abfd
, diff_value
,
8140 &contents
[old_source_offset
]);
8144 /* Check for overflow. */
8145 if ((diff_value
& ~diff_mask
) != 0)
8147 (*link_info
->callbacks
->reloc_dangerous
)
8148 (link_info
, _("overflow after relaxation"),
8149 abfd
, sec
, old_source_offset
);
8153 pin_contents (sec
, contents
);
8156 /* FIXME: If the relocation still references a section in
8157 the same input file, the relocation should be modified
8158 directly instead of adding a "fix" record. */
8160 addend_displacement
=
8161 new_reloc
.target_offset
+ new_reloc
.virtual_offset
;
8163 fix
= reloc_bfd_fix_init (sec
, source_offset
, r_type
, 0,
8164 r_reloc_get_section (&new_reloc
),
8165 addend_displacement
, TRUE
);
8169 pin_internal_relocs (sec
, internal_relocs
);
8173 if ((relax_info
->is_relaxable_literal_section
8174 || relax_info
->is_relaxable_asm_section
)
8175 && relax_info
->action_list
.head
)
8177 /* Walk through the planned actions and build up a table
8178 of move, copy and fill records. Use the move, copy and
8179 fill records to perform the actions once. */
8181 bfd_size_type size
= sec
->size
;
8183 bfd_size_type final_size
, copy_size
, orig_insn_size
;
8184 bfd_byte
*scratch
= NULL
;
8185 bfd_byte
*dup_contents
= NULL
;
8186 bfd_size_type orig_size
= size
;
8187 bfd_vma orig_dot
= 0;
8188 bfd_vma orig_dot_copied
= 0; /* Byte copied already from
8189 orig dot in physical memory. */
8190 bfd_vma orig_dot_vo
= 0; /* Virtual offset from orig_dot. */
8191 bfd_vma dup_dot
= 0;
8193 text_action
*action
= relax_info
->action_list
.head
;
8195 final_size
= sec
->size
;
8196 for (action
= relax_info
->action_list
.head
; action
;
8197 action
= action
->next
)
8199 final_size
-= action
->removed_bytes
;
8202 scratch
= (bfd_byte
*) bfd_zmalloc (final_size
);
8203 dup_contents
= (bfd_byte
*) bfd_zmalloc (final_size
);
8205 /* The dot is the current fill location. */
8207 print_action_list (stderr
, &relax_info
->action_list
);
8210 for (action
= relax_info
->action_list
.head
; action
;
8211 action
= action
->next
)
8213 virtual_action
= FALSE
;
8214 if (action
->offset
> orig_dot
)
8216 orig_dot
+= orig_dot_copied
;
8217 orig_dot_copied
= 0;
8219 /* Out of the virtual world. */
8222 if (action
->offset
> orig_dot
)
8224 copy_size
= action
->offset
- orig_dot
;
8225 memmove (&dup_contents
[dup_dot
], &contents
[orig_dot
], copy_size
);
8226 orig_dot
+= copy_size
;
8227 dup_dot
+= copy_size
;
8228 BFD_ASSERT (action
->offset
== orig_dot
);
8230 else if (action
->offset
< orig_dot
)
8232 if (action
->action
== ta_fill
8233 && action
->offset
- action
->removed_bytes
== orig_dot
)
8235 /* This is OK because the fill only effects the dup_dot. */
8237 else if (action
->action
== ta_add_literal
)
8239 /* TBD. Might need to handle this. */
8242 if (action
->offset
== orig_dot
)
8244 if (action
->virtual_offset
> orig_dot_vo
)
8246 if (orig_dot_vo
== 0)
8248 /* Need to copy virtual_offset bytes. Probably four. */
8249 copy_size
= action
->virtual_offset
- orig_dot_vo
;
8250 memmove (&dup_contents
[dup_dot
],
8251 &contents
[orig_dot
], copy_size
);
8252 orig_dot_copied
= copy_size
;
8253 dup_dot
+= copy_size
;
8255 virtual_action
= TRUE
;
8258 BFD_ASSERT (action
->virtual_offset
<= orig_dot_vo
);
8260 switch (action
->action
)
8262 case ta_remove_literal
:
8263 case ta_remove_insn
:
8264 BFD_ASSERT (action
->removed_bytes
>= 0);
8265 orig_dot
+= action
->removed_bytes
;
8268 case ta_narrow_insn
:
8271 memmove (scratch
, &contents
[orig_dot
], orig_insn_size
);
8272 BFD_ASSERT (action
->removed_bytes
== 1);
8273 rv
= narrow_instruction (scratch
, final_size
, 0);
8275 memmove (&dup_contents
[dup_dot
], scratch
, copy_size
);
8276 orig_dot
+= orig_insn_size
;
8277 dup_dot
+= copy_size
;
8281 if (action
->removed_bytes
>= 0)
8282 orig_dot
+= action
->removed_bytes
;
8285 /* Already zeroed in dup_contents. Just bump the
8287 dup_dot
+= (-action
->removed_bytes
);
8292 BFD_ASSERT (action
->removed_bytes
== 0);
8295 case ta_convert_longcall
:
8296 case ta_remove_longcall
:
8297 /* These will be removed or converted before we get here. */
8304 memmove (scratch
, &contents
[orig_dot
], orig_insn_size
);
8305 BFD_ASSERT (action
->removed_bytes
== -1);
8306 rv
= widen_instruction (scratch
, final_size
, 0);
8308 memmove (&dup_contents
[dup_dot
], scratch
, copy_size
);
8309 orig_dot
+= orig_insn_size
;
8310 dup_dot
+= copy_size
;
8313 case ta_add_literal
:
8316 BFD_ASSERT (action
->removed_bytes
== -4);
8317 /* TBD -- place the literal value here and insert
8319 memset (&dup_contents
[dup_dot
], 0, 4);
8320 pin_internal_relocs (sec
, internal_relocs
);
8321 pin_contents (sec
, contents
);
8323 if (!move_literal (abfd
, link_info
, sec
, dup_dot
, dup_contents
,
8324 relax_info
, &internal_relocs
, &action
->value
))
8328 orig_dot_vo
+= copy_size
;
8330 orig_dot
+= orig_insn_size
;
8331 dup_dot
+= copy_size
;
8335 /* Not implemented yet. */
8340 size
-= action
->removed_bytes
;
8341 removed
+= action
->removed_bytes
;
8342 BFD_ASSERT (dup_dot
<= final_size
);
8343 BFD_ASSERT (orig_dot
<= orig_size
);
8346 orig_dot
+= orig_dot_copied
;
8347 orig_dot_copied
= 0;
8349 if (orig_dot
!= orig_size
)
8351 copy_size
= orig_size
- orig_dot
;
8352 BFD_ASSERT (orig_size
> orig_dot
);
8353 BFD_ASSERT (dup_dot
+ copy_size
== final_size
);
8354 memmove (&dup_contents
[dup_dot
], &contents
[orig_dot
], copy_size
);
8355 orig_dot
+= copy_size
;
8356 dup_dot
+= copy_size
;
8358 BFD_ASSERT (orig_size
== orig_dot
);
8359 BFD_ASSERT (final_size
== dup_dot
);
8361 /* Move the dup_contents back. */
8362 if (final_size
> orig_size
)
8364 /* Contents need to be reallocated. Swap the dup_contents into
8366 sec
->contents
= dup_contents
;
8368 contents
= dup_contents
;
8369 pin_contents (sec
, contents
);
8373 BFD_ASSERT (final_size
<= orig_size
);
8374 memset (contents
, 0, orig_size
);
8375 memcpy (contents
, dup_contents
, final_size
);
8376 free (dup_contents
);
8379 pin_contents (sec
, contents
);
8381 sec
->size
= final_size
;
8385 release_internal_relocs (sec
, internal_relocs
);
8386 release_contents (sec
, contents
);
8392 translate_section_fixes (asection
*sec
)
8394 xtensa_relax_info
*relax_info
;
8397 relax_info
= get_xtensa_relax_info (sec
);
8401 for (r
= relax_info
->fix_list
; r
!= NULL
; r
= r
->next
)
8402 if (!translate_reloc_bfd_fix (r
))
8409 /* Translate a fix given the mapping in the relax info for the target
8410 section. If it has already been translated, no work is required. */
8413 translate_reloc_bfd_fix (reloc_bfd_fix
*fix
)
8415 reloc_bfd_fix new_fix
;
8417 xtensa_relax_info
*relax_info
;
8418 removed_literal
*removed
;
8419 bfd_vma new_offset
, target_offset
;
8421 if (fix
->translated
)
8424 sec
= fix
->target_sec
;
8425 target_offset
= fix
->target_offset
;
8427 relax_info
= get_xtensa_relax_info (sec
);
8430 fix
->translated
= TRUE
;
8436 /* The fix does not need to be translated if the section cannot change. */
8437 if (!relax_info
->is_relaxable_literal_section
8438 && !relax_info
->is_relaxable_asm_section
)
8440 fix
->translated
= TRUE
;
8444 /* If the literal has been moved and this relocation was on an
8445 opcode, then the relocation should move to the new literal
8446 location. Otherwise, the relocation should move within the
8450 if (is_operand_relocation (fix
->src_type
))
8452 /* Check if the original relocation is against a literal being
8454 removed
= find_removed_literal (&relax_info
->removed_list
,
8462 /* The fact that there is still a relocation to this literal indicates
8463 that the literal is being coalesced, not simply removed. */
8464 BFD_ASSERT (removed
->to
.abfd
!= NULL
);
8466 /* This was moved to some other address (possibly another section). */
8467 new_sec
= r_reloc_get_section (&removed
->to
);
8471 relax_info
= get_xtensa_relax_info (sec
);
8473 (!relax_info
->is_relaxable_literal_section
8474 && !relax_info
->is_relaxable_asm_section
))
8476 target_offset
= removed
->to
.target_offset
;
8477 new_fix
.target_sec
= new_sec
;
8478 new_fix
.target_offset
= target_offset
;
8479 new_fix
.translated
= TRUE
;
8484 target_offset
= removed
->to
.target_offset
;
8485 new_fix
.target_sec
= new_sec
;
8488 /* The target address may have been moved within its section. */
8489 new_offset
= offset_with_removed_text (&relax_info
->action_list
,
8492 new_fix
.target_offset
= new_offset
;
8493 new_fix
.target_offset
= new_offset
;
8494 new_fix
.translated
= TRUE
;
8500 /* Fix up a relocation to take account of removed literals. */
8503 translate_reloc (const r_reloc
*orig_rel
, r_reloc
*new_rel
)
8506 xtensa_relax_info
*relax_info
;
8507 removed_literal
*removed
;
8508 bfd_vma new_offset
, target_offset
, removed_bytes
;
8510 *new_rel
= *orig_rel
;
8512 if (!r_reloc_is_defined (orig_rel
))
8514 sec
= r_reloc_get_section (orig_rel
);
8516 relax_info
= get_xtensa_relax_info (sec
);
8517 BFD_ASSERT (relax_info
);
8519 if (!relax_info
->is_relaxable_literal_section
8520 && !relax_info
->is_relaxable_asm_section
)
8523 target_offset
= orig_rel
->target_offset
;
8526 if (is_operand_relocation (ELF32_R_TYPE (orig_rel
->rela
.r_info
)))
8528 /* Check if the original relocation is against a literal being
8530 removed
= find_removed_literal (&relax_info
->removed_list
,
8533 if (removed
&& removed
->to
.abfd
)
8537 /* The fact that there is still a relocation to this literal indicates
8538 that the literal is being coalesced, not simply removed. */
8539 BFD_ASSERT (removed
->to
.abfd
!= NULL
);
8541 /* This was moved to some other address
8542 (possibly in another section). */
8543 *new_rel
= removed
->to
;
8544 new_sec
= r_reloc_get_section (new_rel
);
8548 relax_info
= get_xtensa_relax_info (sec
);
8550 || (!relax_info
->is_relaxable_literal_section
8551 && !relax_info
->is_relaxable_asm_section
))
8554 target_offset
= new_rel
->target_offset
;
8557 /* ...and the target address may have been moved within its section. */
8558 new_offset
= offset_with_removed_text (&relax_info
->action_list
,
8561 /* Modify the offset and addend. */
8562 removed_bytes
= target_offset
- new_offset
;
8563 new_rel
->target_offset
= new_offset
;
8564 new_rel
->rela
.r_addend
-= removed_bytes
;
8568 /* For dynamic links, there may be a dynamic relocation for each
8569 literal. The number of dynamic relocations must be computed in
8570 size_dynamic_sections, which occurs before relaxation. When a
8571 literal is removed, this function checks if there is a corresponding
8572 dynamic relocation and shrinks the size of the appropriate dynamic
8573 relocation section accordingly. At this point, the contents of the
8574 dynamic relocation sections have not yet been filled in, so there's
8575 nothing else that needs to be done. */
8578 shrink_dynamic_reloc_sections (struct bfd_link_info
*info
,
8580 asection
*input_section
,
8581 Elf_Internal_Rela
*rel
)
8583 struct elf_xtensa_link_hash_table
*htab
;
8584 Elf_Internal_Shdr
*symtab_hdr
;
8585 struct elf_link_hash_entry
**sym_hashes
;
8586 unsigned long r_symndx
;
8588 struct elf_link_hash_entry
*h
;
8589 bfd_boolean dynamic_symbol
;
8591 htab
= elf_xtensa_hash_table (info
);
8592 symtab_hdr
= &elf_tdata (abfd
)->symtab_hdr
;
8593 sym_hashes
= elf_sym_hashes (abfd
);
8595 r_type
= ELF32_R_TYPE (rel
->r_info
);
8596 r_symndx
= ELF32_R_SYM (rel
->r_info
);
8598 if (r_symndx
< symtab_hdr
->sh_info
)
8601 h
= sym_hashes
[r_symndx
- symtab_hdr
->sh_info
];
8603 dynamic_symbol
= elf_xtensa_dynamic_symbol_p (h
, info
);
8605 if ((r_type
== R_XTENSA_32
|| r_type
== R_XTENSA_PLT
)
8606 && (input_section
->flags
& SEC_ALLOC
) != 0
8607 && (dynamic_symbol
|| info
->shared
))
8610 bfd_boolean is_plt
= FALSE
;
8612 if (dynamic_symbol
&& r_type
== R_XTENSA_PLT
)
8614 srel
= htab
->srelplt
;
8618 srel
= htab
->srelgot
;
8620 /* Reduce size of the .rela.* section by one reloc. */
8621 BFD_ASSERT (srel
!= NULL
);
8622 BFD_ASSERT (srel
->size
>= sizeof (Elf32_External_Rela
));
8623 srel
->size
-= sizeof (Elf32_External_Rela
);
8627 asection
*splt
, *sgotplt
, *srelgot
;
8628 int reloc_index
, chunk
;
8630 /* Find the PLT reloc index of the entry being removed. This
8631 is computed from the size of ".rela.plt". It is needed to
8632 figure out which PLT chunk to resize. Usually "last index
8633 = size - 1" since the index starts at zero, but in this
8634 context, the size has just been decremented so there's no
8635 need to subtract one. */
8636 reloc_index
= srel
->size
/ sizeof (Elf32_External_Rela
);
8638 chunk
= reloc_index
/ PLT_ENTRIES_PER_CHUNK
;
8639 splt
= elf_xtensa_get_plt_section (info
, chunk
);
8640 sgotplt
= elf_xtensa_get_gotplt_section (info
, chunk
);
8641 BFD_ASSERT (splt
!= NULL
&& sgotplt
!= NULL
);
8643 /* Check if an entire PLT chunk has just been eliminated. */
8644 if (reloc_index
% PLT_ENTRIES_PER_CHUNK
== 0)
8646 /* The two magic GOT entries for that chunk can go away. */
8647 srelgot
= htab
->srelgot
;
8648 BFD_ASSERT (srelgot
!= NULL
);
8649 srelgot
->reloc_count
-= 2;
8650 srelgot
->size
-= 2 * sizeof (Elf32_External_Rela
);
8653 /* There should be only one entry left (and it will be
8655 BFD_ASSERT (sgotplt
->size
== 4);
8656 BFD_ASSERT (splt
->size
== PLT_ENTRY_SIZE
);
8659 BFD_ASSERT (sgotplt
->size
>= 4);
8660 BFD_ASSERT (splt
->size
>= PLT_ENTRY_SIZE
);
8663 splt
->size
-= PLT_ENTRY_SIZE
;
8669 /* Take an r_rel and move it to another section. This usually
8670 requires extending the interal_relocation array and pinning it. If
8671 the original r_rel is from the same BFD, we can complete this here.
8672 Otherwise, we add a fix record to let the final link fix the
8673 appropriate address. Contents and internal relocations for the
8674 section must be pinned after calling this routine. */
8677 move_literal (bfd
*abfd
,
8678 struct bfd_link_info
*link_info
,
8682 xtensa_relax_info
*relax_info
,
8683 Elf_Internal_Rela
**internal_relocs_p
,
8684 const literal_value
*lit
)
8686 Elf_Internal_Rela
*new_relocs
= NULL
;
8687 size_t new_relocs_count
= 0;
8688 Elf_Internal_Rela this_rela
;
8689 const r_reloc
*r_rel
;
8691 r_rel
= &lit
->r_rel
;
8692 BFD_ASSERT (elf_section_data (sec
)->relocs
== *internal_relocs_p
);
8694 if (r_reloc_is_const (r_rel
))
8695 bfd_put_32 (abfd
, lit
->value
, contents
+ offset
);
8700 asection
*target_sec
;
8704 r_type
= ELF32_R_TYPE (r_rel
->rela
.r_info
);
8705 target_sec
= r_reloc_get_section (r_rel
);
8707 /* This is the difficult case. We have to create a fix up. */
8708 this_rela
.r_offset
= offset
;
8709 this_rela
.r_info
= ELF32_R_INFO (0, r_type
);
8710 this_rela
.r_addend
=
8711 r_rel
->target_offset
- r_reloc_get_target_offset (r_rel
);
8712 bfd_put_32 (abfd
, lit
->value
, contents
+ offset
);
8714 /* Currently, we cannot move relocations during a relocatable link. */
8715 BFD_ASSERT (!link_info
->relocatable
);
8716 fix
= reloc_bfd_fix_init (sec
, offset
, r_type
, r_rel
->abfd
,
8717 r_reloc_get_section (r_rel
),
8718 r_rel
->target_offset
+ r_rel
->virtual_offset
,
8720 /* We also need to mark that relocations are needed here. */
8721 sec
->flags
|= SEC_RELOC
;
8723 translate_reloc_bfd_fix (fix
);
8724 /* This fix has not yet been translated. */
8727 /* Add the relocation. If we have already allocated our own
8728 space for the relocations and we have room for more, then use
8729 it. Otherwise, allocate new space and move the literals. */
8730 insert_at
= sec
->reloc_count
;
8731 for (i
= 0; i
< sec
->reloc_count
; ++i
)
8733 if (this_rela
.r_offset
< (*internal_relocs_p
)[i
].r_offset
)
8740 if (*internal_relocs_p
!= relax_info
->allocated_relocs
8741 || sec
->reloc_count
+ 1 > relax_info
->allocated_relocs_count
)
8743 BFD_ASSERT (relax_info
->allocated_relocs
== NULL
8744 || sec
->reloc_count
== relax_info
->relocs_count
);
8746 if (relax_info
->allocated_relocs_count
== 0)
8747 new_relocs_count
= (sec
->reloc_count
+ 2) * 2;
8749 new_relocs_count
= (relax_info
->allocated_relocs_count
+ 2) * 2;
8751 new_relocs
= (Elf_Internal_Rela
*)
8752 bfd_zmalloc (sizeof (Elf_Internal_Rela
) * (new_relocs_count
));
8756 /* We could handle this more quickly by finding the split point. */
8758 memcpy (new_relocs
, *internal_relocs_p
,
8759 insert_at
* sizeof (Elf_Internal_Rela
));
8761 new_relocs
[insert_at
] = this_rela
;
8763 if (insert_at
!= sec
->reloc_count
)
8764 memcpy (new_relocs
+ insert_at
+ 1,
8765 (*internal_relocs_p
) + insert_at
,
8766 (sec
->reloc_count
- insert_at
)
8767 * sizeof (Elf_Internal_Rela
));
8769 if (*internal_relocs_p
!= relax_info
->allocated_relocs
)
8771 /* The first time we re-allocate, we can only free the
8772 old relocs if they were allocated with bfd_malloc.
8773 This is not true when keep_memory is in effect. */
8774 if (!link_info
->keep_memory
)
8775 free (*internal_relocs_p
);
8778 free (*internal_relocs_p
);
8779 relax_info
->allocated_relocs
= new_relocs
;
8780 relax_info
->allocated_relocs_count
= new_relocs_count
;
8781 elf_section_data (sec
)->relocs
= new_relocs
;
8783 relax_info
->relocs_count
= sec
->reloc_count
;
8784 *internal_relocs_p
= new_relocs
;
8788 if (insert_at
!= sec
->reloc_count
)
8791 for (idx
= sec
->reloc_count
; idx
> insert_at
; idx
--)
8792 (*internal_relocs_p
)[idx
] = (*internal_relocs_p
)[idx
-1];
8794 (*internal_relocs_p
)[insert_at
] = this_rela
;
8796 if (relax_info
->allocated_relocs
)
8797 relax_info
->relocs_count
= sec
->reloc_count
;
8804 /* This is similar to relax_section except that when a target is moved,
8805 we shift addresses up. We also need to modify the size. This
8806 algorithm does NOT allow for relocations into the middle of the
8807 property sections. */
8810 relax_property_section (bfd
*abfd
,
8812 struct bfd_link_info
*link_info
)
8814 Elf_Internal_Rela
*internal_relocs
;
8817 bfd_boolean ok
= TRUE
;
8818 bfd_boolean is_full_prop_section
;
8819 size_t last_zfill_target_offset
= 0;
8820 asection
*last_zfill_target_sec
= NULL
;
8821 bfd_size_type sec_size
;
8823 sec_size
= bfd_get_section_limit (abfd
, sec
);
8824 internal_relocs
= retrieve_internal_relocs (abfd
, sec
,
8825 link_info
->keep_memory
);
8826 contents
= retrieve_contents (abfd
, sec
, link_info
->keep_memory
);
8827 if (contents
== NULL
&& sec_size
!= 0)
8833 is_full_prop_section
=
8834 ( CONST_STRNEQ (sec
->name
, XTENSA_PROP_SEC_NAME
)
8835 || CONST_STRNEQ (sec
->name
, ".gnu.linkonce.prop."));
8837 if (internal_relocs
)
8839 for (i
= 0; i
< sec
->reloc_count
; i
++)
8841 Elf_Internal_Rela
*irel
;
8842 xtensa_relax_info
*target_relax_info
;
8844 asection
*target_sec
;
8846 bfd_byte
*size_p
, *flags_p
;
8848 /* Locally change the source address.
8849 Translate the target to the new target address.
8850 If it points to this section and has been removed, MOVE IT.
8851 Also, don't forget to modify the associated SIZE at
8854 irel
= &internal_relocs
[i
];
8855 r_type
= ELF32_R_TYPE (irel
->r_info
);
8856 if (r_type
== R_XTENSA_NONE
)
8859 /* Find the literal value. */
8860 r_reloc_init (&val
.r_rel
, abfd
, irel
, contents
, sec_size
);
8861 size_p
= &contents
[irel
->r_offset
+ 4];
8863 if (is_full_prop_section
)
8865 flags_p
= &contents
[irel
->r_offset
+ 8];
8866 BFD_ASSERT (irel
->r_offset
+ 12 <= sec_size
);
8869 BFD_ASSERT (irel
->r_offset
+ 8 <= sec_size
);
8871 target_sec
= r_reloc_get_section (&val
.r_rel
);
8872 target_relax_info
= get_xtensa_relax_info (target_sec
);
8874 if (target_relax_info
8875 && (target_relax_info
->is_relaxable_literal_section
8876 || target_relax_info
->is_relaxable_asm_section
))
8878 /* Translate the relocation's destination. */
8879 bfd_vma new_offset
, new_end_offset
;
8880 long old_size
, new_size
;
8882 new_offset
= offset_with_removed_text
8883 (&target_relax_info
->action_list
, val
.r_rel
.target_offset
);
8885 /* Assert that we are not out of bounds. */
8886 old_size
= bfd_get_32 (abfd
, size_p
);
8890 /* Only the first zero-sized unreachable entry is
8891 allowed to expand. In this case the new offset
8892 should be the offset before the fill and the new
8893 size is the expansion size. For other zero-sized
8894 entries the resulting size should be zero with an
8895 offset before or after the fill address depending
8896 on whether the expanding unreachable entry
8898 if (last_zfill_target_sec
8899 && last_zfill_target_sec
== target_sec
8900 && last_zfill_target_offset
== val
.r_rel
.target_offset
)
8901 new_end_offset
= new_offset
;
8904 new_end_offset
= new_offset
;
8905 new_offset
= offset_with_removed_text_before_fill
8906 (&target_relax_info
->action_list
,
8907 val
.r_rel
.target_offset
);
8909 /* If it is not unreachable and we have not yet
8910 seen an unreachable at this address, place it
8911 before the fill address. */
8913 || (bfd_get_32 (abfd
, flags_p
)
8914 & XTENSA_PROP_UNREACHABLE
) == 0)
8915 new_end_offset
= new_offset
;
8918 last_zfill_target_sec
= target_sec
;
8919 last_zfill_target_offset
= val
.r_rel
.target_offset
;
8925 new_end_offset
= offset_with_removed_text_before_fill
8926 (&target_relax_info
->action_list
,
8927 val
.r_rel
.target_offset
+ old_size
);
8930 new_size
= new_end_offset
- new_offset
;
8932 if (new_size
!= old_size
)
8934 bfd_put_32 (abfd
, new_size
, size_p
);
8935 pin_contents (sec
, contents
);
8938 if (new_offset
!= val
.r_rel
.target_offset
)
8940 bfd_vma diff
= new_offset
- val
.r_rel
.target_offset
;
8941 irel
->r_addend
+= diff
;
8942 pin_internal_relocs (sec
, internal_relocs
);
8948 /* Combine adjacent property table entries. This is also done in
8949 finish_dynamic_sections() but at that point it's too late to
8950 reclaim the space in the output section, so we do this twice. */
8952 if (internal_relocs
&& (!link_info
->relocatable
8953 || strcmp (sec
->name
, XTENSA_LIT_SEC_NAME
) == 0))
8955 Elf_Internal_Rela
*last_irel
= NULL
;
8956 int removed_bytes
= 0;
8957 bfd_vma offset
, last_irel_offset
;
8958 bfd_vma section_size
;
8959 bfd_size_type entry_size
;
8960 flagword predef_flags
;
8962 if (is_full_prop_section
)
8967 predef_flags
= xtensa_get_property_predef_flags (sec
);
8969 /* Walk over memory and irels at the same time.
8970 This REQUIRES that the internal_relocs be sorted by offset. */
8971 qsort (internal_relocs
, sec
->reloc_count
, sizeof (Elf_Internal_Rela
),
8972 internal_reloc_compare
);
8973 nexti
= 0; /* Index into internal_relocs. */
8975 pin_internal_relocs (sec
, internal_relocs
);
8976 pin_contents (sec
, contents
);
8978 last_irel_offset
= (bfd_vma
) -1;
8979 section_size
= sec
->size
;
8980 BFD_ASSERT (section_size
% entry_size
== 0);
8982 for (offset
= 0; offset
< section_size
; offset
+= entry_size
)
8984 Elf_Internal_Rela
*irel
, *next_irel
;
8985 bfd_vma bytes_to_remove
, size
, actual_offset
;
8986 bfd_boolean remove_this_irel
;
8992 /* Find the next two relocations (if there are that many left),
8993 skipping over any R_XTENSA_NONE relocs. On entry, "nexti" is
8994 the starting reloc index. After these two loops, "i"
8995 is the index of the first non-NONE reloc past that starting
8996 index, and "nexti" is the index for the next non-NONE reloc
8999 for (i
= nexti
; i
< sec
->reloc_count
; i
++)
9001 if (ELF32_R_TYPE (internal_relocs
[i
].r_info
) != R_XTENSA_NONE
)
9003 irel
= &internal_relocs
[i
];
9006 internal_relocs
[i
].r_offset
-= removed_bytes
;
9009 for (nexti
= i
+ 1; nexti
< sec
->reloc_count
; nexti
++)
9011 if (ELF32_R_TYPE (internal_relocs
[nexti
].r_info
)
9014 next_irel
= &internal_relocs
[nexti
];
9017 internal_relocs
[nexti
].r_offset
-= removed_bytes
;
9020 remove_this_irel
= FALSE
;
9021 bytes_to_remove
= 0;
9022 actual_offset
= offset
- removed_bytes
;
9023 size
= bfd_get_32 (abfd
, &contents
[actual_offset
+ 4]);
9025 if (is_full_prop_section
)
9026 flags
= bfd_get_32 (abfd
, &contents
[actual_offset
+ 8]);
9028 flags
= predef_flags
;
9030 /* Check that the irels are sorted by offset,
9031 with only one per address. */
9032 BFD_ASSERT (!irel
|| (int) irel
->r_offset
> (int) last_irel_offset
);
9033 BFD_ASSERT (!next_irel
|| next_irel
->r_offset
> irel
->r_offset
);
9035 /* Make sure there aren't relocs on the size or flag fields. */
9036 if ((irel
&& irel
->r_offset
== offset
+ 4)
9037 || (is_full_prop_section
9038 && irel
&& irel
->r_offset
== offset
+ 8))
9040 irel
->r_offset
-= removed_bytes
;
9041 last_irel_offset
= irel
->r_offset
;
9043 else if (next_irel
&& (next_irel
->r_offset
== offset
+ 4
9044 || (is_full_prop_section
9045 && next_irel
->r_offset
== offset
+ 8)))
9048 irel
->r_offset
-= removed_bytes
;
9049 next_irel
->r_offset
-= removed_bytes
;
9050 last_irel_offset
= next_irel
->r_offset
;
9052 else if (size
== 0 && (flags
& XTENSA_PROP_ALIGN
) == 0
9053 && (flags
& XTENSA_PROP_UNREACHABLE
) == 0)
9055 /* Always remove entries with zero size and no alignment. */
9056 bytes_to_remove
= entry_size
;
9057 if (irel
&& irel
->r_offset
== offset
)
9059 remove_this_irel
= TRUE
;
9061 irel
->r_offset
-= removed_bytes
;
9062 last_irel_offset
= irel
->r_offset
;
9065 else if (irel
&& irel
->r_offset
== offset
)
9067 if (ELF32_R_TYPE (irel
->r_info
) == R_XTENSA_32
)
9073 bfd_get_32 (abfd
, &contents
[last_irel
->r_offset
+ 4]);
9074 bfd_vma old_address
=
9075 (last_irel
->r_addend
9076 + bfd_get_32 (abfd
, &contents
[last_irel
->r_offset
]));
9077 bfd_vma new_address
=
9079 + bfd_get_32 (abfd
, &contents
[actual_offset
]));
9080 if (is_full_prop_section
)
9081 old_flags
= bfd_get_32
9082 (abfd
, &contents
[last_irel
->r_offset
+ 8]);
9084 old_flags
= predef_flags
;
9086 if ((ELF32_R_SYM (irel
->r_info
)
9087 == ELF32_R_SYM (last_irel
->r_info
))
9088 && old_address
+ old_size
== new_address
9089 && old_flags
== flags
9090 && (old_flags
& XTENSA_PROP_INSN_BRANCH_TARGET
) == 0
9091 && (old_flags
& XTENSA_PROP_INSN_LOOP_TARGET
) == 0)
9093 /* Fix the old size. */
9094 bfd_put_32 (abfd
, old_size
+ size
,
9095 &contents
[last_irel
->r_offset
+ 4]);
9096 bytes_to_remove
= entry_size
;
9097 remove_this_irel
= TRUE
;
9106 irel
->r_offset
-= removed_bytes
;
9107 last_irel_offset
= irel
->r_offset
;
9110 if (remove_this_irel
)
9112 irel
->r_info
= ELF32_R_INFO (0, R_XTENSA_NONE
);
9113 irel
->r_offset
-= bytes_to_remove
;
9116 if (bytes_to_remove
!= 0)
9118 removed_bytes
+= bytes_to_remove
;
9119 if (offset
+ bytes_to_remove
< section_size
)
9120 memmove (&contents
[actual_offset
],
9121 &contents
[actual_offset
+ bytes_to_remove
],
9122 section_size
- offset
- bytes_to_remove
);
9128 /* Clear the removed bytes. */
9129 memset (&contents
[section_size
- removed_bytes
], 0, removed_bytes
);
9131 sec
->size
= section_size
- removed_bytes
;
9133 if (xtensa_is_littable_section (sec
))
9135 asection
*sgotloc
= elf_xtensa_hash_table (link_info
)->sgotloc
;
9137 sgotloc
->size
-= removed_bytes
;
9143 release_internal_relocs (sec
, internal_relocs
);
9144 release_contents (sec
, contents
);
9149 /* Third relaxation pass. */
9151 /* Change symbol values to account for removed literals. */
9154 relax_section_symbols (bfd
*abfd
, asection
*sec
)
9156 xtensa_relax_info
*relax_info
;
9157 unsigned int sec_shndx
;
9158 Elf_Internal_Shdr
*symtab_hdr
;
9159 Elf_Internal_Sym
*isymbuf
;
9160 unsigned i
, num_syms
, num_locals
;
9162 relax_info
= get_xtensa_relax_info (sec
);
9163 BFD_ASSERT (relax_info
);
9165 if (!relax_info
->is_relaxable_literal_section
9166 && !relax_info
->is_relaxable_asm_section
)
9169 sec_shndx
= _bfd_elf_section_from_bfd_section (abfd
, sec
);
9171 symtab_hdr
= &elf_tdata (abfd
)->symtab_hdr
;
9172 isymbuf
= retrieve_local_syms (abfd
);
9174 num_syms
= symtab_hdr
->sh_size
/ sizeof (Elf32_External_Sym
);
9175 num_locals
= symtab_hdr
->sh_info
;
9177 /* Adjust the local symbols defined in this section. */
9178 for (i
= 0; i
< num_locals
; i
++)
9180 Elf_Internal_Sym
*isym
= &isymbuf
[i
];
9182 if (isym
->st_shndx
== sec_shndx
)
9184 bfd_vma new_address
= offset_with_removed_text
9185 (&relax_info
->action_list
, isym
->st_value
);
9186 bfd_vma new_size
= isym
->st_size
;
9188 if (ELF32_ST_TYPE (isym
->st_info
) == STT_FUNC
)
9190 bfd_vma new_end
= offset_with_removed_text
9191 (&relax_info
->action_list
, isym
->st_value
+ isym
->st_size
);
9192 new_size
= new_end
- new_address
;
9195 isym
->st_value
= new_address
;
9196 isym
->st_size
= new_size
;
9200 /* Now adjust the global symbols defined in this section. */
9201 for (i
= 0; i
< (num_syms
- num_locals
); i
++)
9203 struct elf_link_hash_entry
*sym_hash
;
9205 sym_hash
= elf_sym_hashes (abfd
)[i
];
9207 if (sym_hash
->root
.type
== bfd_link_hash_warning
)
9208 sym_hash
= (struct elf_link_hash_entry
*) sym_hash
->root
.u
.i
.link
;
9210 if ((sym_hash
->root
.type
== bfd_link_hash_defined
9211 || sym_hash
->root
.type
== bfd_link_hash_defweak
)
9212 && sym_hash
->root
.u
.def
.section
== sec
)
9214 bfd_vma new_address
= offset_with_removed_text
9215 (&relax_info
->action_list
, sym_hash
->root
.u
.def
.value
);
9216 bfd_vma new_size
= sym_hash
->size
;
9218 if (sym_hash
->type
== STT_FUNC
)
9220 bfd_vma new_end
= offset_with_removed_text
9221 (&relax_info
->action_list
,
9222 sym_hash
->root
.u
.def
.value
+ sym_hash
->size
);
9223 new_size
= new_end
- new_address
;
9226 sym_hash
->root
.u
.def
.value
= new_address
;
9227 sym_hash
->size
= new_size
;
9235 /* "Fix" handling functions, called while performing relocations. */
9238 do_fix_for_relocatable_link (Elf_Internal_Rela
*rel
,
9240 asection
*input_section
,
9244 asection
*sec
, *old_sec
;
9246 int r_type
= ELF32_R_TYPE (rel
->r_info
);
9249 if (r_type
== R_XTENSA_NONE
)
9252 fix
= get_bfd_fix (input_section
, rel
->r_offset
, r_type
);
9256 r_reloc_init (&r_rel
, input_bfd
, rel
, contents
,
9257 bfd_get_section_limit (input_bfd
, input_section
));
9258 old_sec
= r_reloc_get_section (&r_rel
);
9259 old_offset
= r_rel
.target_offset
;
9261 if (!old_sec
|| !r_reloc_is_defined (&r_rel
))
9263 if (r_type
!= R_XTENSA_ASM_EXPAND
)
9265 (*_bfd_error_handler
)
9266 (_("%B(%A+0x%lx): unexpected fix for %s relocation"),
9267 input_bfd
, input_section
, rel
->r_offset
,
9268 elf_howto_table
[r_type
].name
);
9271 /* Leave it be. Resolution will happen in a later stage. */
9275 sec
= fix
->target_sec
;
9276 rel
->r_addend
+= ((sec
->output_offset
+ fix
->target_offset
)
9277 - (old_sec
->output_offset
+ old_offset
));
9284 do_fix_for_final_link (Elf_Internal_Rela
*rel
,
9286 asection
*input_section
,
9288 bfd_vma
*relocationp
)
9291 int r_type
= ELF32_R_TYPE (rel
->r_info
);
9295 if (r_type
== R_XTENSA_NONE
)
9298 fix
= get_bfd_fix (input_section
, rel
->r_offset
, r_type
);
9302 sec
= fix
->target_sec
;
9304 fixup_diff
= rel
->r_addend
;
9305 if (elf_howto_table
[fix
->src_type
].partial_inplace
)
9307 bfd_vma inplace_val
;
9308 BFD_ASSERT (fix
->src_offset
9309 < bfd_get_section_limit (input_bfd
, input_section
));
9310 inplace_val
= bfd_get_32 (input_bfd
, &contents
[fix
->src_offset
]);
9311 fixup_diff
+= inplace_val
;
9314 *relocationp
= (sec
->output_section
->vma
9315 + sec
->output_offset
9316 + fix
->target_offset
- fixup_diff
);
9320 /* Miscellaneous utility functions.... */
9323 elf_xtensa_get_plt_section (struct bfd_link_info
*info
, int chunk
)
9325 struct elf_xtensa_link_hash_table
*htab
;
9331 htab
= elf_xtensa_hash_table (info
);
9335 dynobj
= elf_hash_table (info
)->dynobj
;
9336 sprintf (plt_name
, ".plt.%u", chunk
);
9337 return bfd_get_section_by_name (dynobj
, plt_name
);
9342 elf_xtensa_get_gotplt_section (struct bfd_link_info
*info
, int chunk
)
9344 struct elf_xtensa_link_hash_table
*htab
;
9350 htab
= elf_xtensa_hash_table (info
);
9351 return htab
->sgotplt
;
9354 dynobj
= elf_hash_table (info
)->dynobj
;
9355 sprintf (got_name
, ".got.plt.%u", chunk
);
9356 return bfd_get_section_by_name (dynobj
, got_name
);
9360 /* Get the input section for a given symbol index.
9362 . a section symbol, return the section;
9363 . a common symbol, return the common section;
9364 . an undefined symbol, return the undefined section;
9365 . an indirect symbol, follow the links;
9366 . an absolute value, return the absolute section. */
9369 get_elf_r_symndx_section (bfd
*abfd
, unsigned long r_symndx
)
9371 Elf_Internal_Shdr
*symtab_hdr
= &elf_tdata (abfd
)->symtab_hdr
;
9372 asection
*target_sec
= NULL
;
9373 if (r_symndx
< symtab_hdr
->sh_info
)
9375 Elf_Internal_Sym
*isymbuf
;
9376 unsigned int section_index
;
9378 isymbuf
= retrieve_local_syms (abfd
);
9379 section_index
= isymbuf
[r_symndx
].st_shndx
;
9381 if (section_index
== SHN_UNDEF
)
9382 target_sec
= bfd_und_section_ptr
;
9383 else if (section_index
> 0 && section_index
< SHN_LORESERVE
)
9384 target_sec
= bfd_section_from_elf_index (abfd
, section_index
);
9385 else if (section_index
== SHN_ABS
)
9386 target_sec
= bfd_abs_section_ptr
;
9387 else if (section_index
== SHN_COMMON
)
9388 target_sec
= bfd_com_section_ptr
;
9395 unsigned long indx
= r_symndx
- symtab_hdr
->sh_info
;
9396 struct elf_link_hash_entry
*h
= elf_sym_hashes (abfd
)[indx
];
9398 while (h
->root
.type
== bfd_link_hash_indirect
9399 || h
->root
.type
== bfd_link_hash_warning
)
9400 h
= (struct elf_link_hash_entry
*) h
->root
.u
.i
.link
;
9402 switch (h
->root
.type
)
9404 case bfd_link_hash_defined
:
9405 case bfd_link_hash_defweak
:
9406 target_sec
= h
->root
.u
.def
.section
;
9408 case bfd_link_hash_common
:
9409 target_sec
= bfd_com_section_ptr
;
9411 case bfd_link_hash_undefined
:
9412 case bfd_link_hash_undefweak
:
9413 target_sec
= bfd_und_section_ptr
;
9415 default: /* New indirect warning. */
9416 target_sec
= bfd_und_section_ptr
;
9424 static struct elf_link_hash_entry
*
9425 get_elf_r_symndx_hash_entry (bfd
*abfd
, unsigned long r_symndx
)
9428 struct elf_link_hash_entry
*h
;
9429 Elf_Internal_Shdr
*symtab_hdr
= &elf_tdata (abfd
)->symtab_hdr
;
9431 if (r_symndx
< symtab_hdr
->sh_info
)
9434 indx
= r_symndx
- symtab_hdr
->sh_info
;
9435 h
= elf_sym_hashes (abfd
)[indx
];
9436 while (h
->root
.type
== bfd_link_hash_indirect
9437 || h
->root
.type
== bfd_link_hash_warning
)
9438 h
= (struct elf_link_hash_entry
*) h
->root
.u
.i
.link
;
9443 /* Get the section-relative offset for a symbol number. */
9446 get_elf_r_symndx_offset (bfd
*abfd
, unsigned long r_symndx
)
9448 Elf_Internal_Shdr
*symtab_hdr
= &elf_tdata (abfd
)->symtab_hdr
;
9451 if (r_symndx
< symtab_hdr
->sh_info
)
9453 Elf_Internal_Sym
*isymbuf
;
9454 isymbuf
= retrieve_local_syms (abfd
);
9455 offset
= isymbuf
[r_symndx
].st_value
;
9459 unsigned long indx
= r_symndx
- symtab_hdr
->sh_info
;
9460 struct elf_link_hash_entry
*h
=
9461 elf_sym_hashes (abfd
)[indx
];
9463 while (h
->root
.type
== bfd_link_hash_indirect
9464 || h
->root
.type
== bfd_link_hash_warning
)
9465 h
= (struct elf_link_hash_entry
*) h
->root
.u
.i
.link
;
9466 if (h
->root
.type
== bfd_link_hash_defined
9467 || h
->root
.type
== bfd_link_hash_defweak
)
9468 offset
= h
->root
.u
.def
.value
;
9475 is_reloc_sym_weak (bfd
*abfd
, Elf_Internal_Rela
*rel
)
9477 unsigned long r_symndx
= ELF32_R_SYM (rel
->r_info
);
9478 struct elf_link_hash_entry
*h
;
9480 h
= get_elf_r_symndx_hash_entry (abfd
, r_symndx
);
9481 if (h
&& h
->root
.type
== bfd_link_hash_defweak
)
9488 pcrel_reloc_fits (xtensa_opcode opc
,
9490 bfd_vma self_address
,
9491 bfd_vma dest_address
)
9493 xtensa_isa isa
= xtensa_default_isa
;
9494 uint32 valp
= dest_address
;
9495 if (xtensa_operand_do_reloc (isa
, opc
, opnd
, &valp
, self_address
)
9496 || xtensa_operand_encode (isa
, opc
, opnd
, &valp
))
9502 static int linkonce_len
= sizeof (".gnu.linkonce.") - 1;
9505 xtensa_is_property_section (asection
*sec
)
9507 if (CONST_STRNEQ (sec
->name
, XTENSA_INSN_SEC_NAME
)
9508 || CONST_STRNEQ (sec
->name
, XTENSA_LIT_SEC_NAME
)
9509 || CONST_STRNEQ (sec
->name
, XTENSA_PROP_SEC_NAME
))
9512 if (strncmp (".gnu.linkonce.", sec
->name
, linkonce_len
) == 0
9513 && (CONST_STRNEQ (&sec
->name
[linkonce_len
], "x.")
9514 || CONST_STRNEQ (&sec
->name
[linkonce_len
], "p.")
9515 || CONST_STRNEQ (&sec
->name
[linkonce_len
], "prop.")))
9523 xtensa_is_littable_section (asection
*sec
)
9525 if (CONST_STRNEQ (sec
->name
, XTENSA_LIT_SEC_NAME
))
9528 if (strncmp (".gnu.linkonce.", sec
->name
, linkonce_len
) == 0
9529 && sec
->name
[linkonce_len
] == 'p'
9530 && sec
->name
[linkonce_len
+ 1] == '.')
9538 internal_reloc_compare (const void *ap
, const void *bp
)
9540 const Elf_Internal_Rela
*a
= (const Elf_Internal_Rela
*) ap
;
9541 const Elf_Internal_Rela
*b
= (const Elf_Internal_Rela
*) bp
;
9543 if (a
->r_offset
!= b
->r_offset
)
9544 return (a
->r_offset
- b
->r_offset
);
9546 /* We don't need to sort on these criteria for correctness,
9547 but enforcing a more strict ordering prevents unstable qsort
9548 from behaving differently with different implementations.
9549 Without the code below we get correct but different results
9550 on Solaris 2.7 and 2.8. We would like to always produce the
9551 same results no matter the host. */
9553 if (a
->r_info
!= b
->r_info
)
9554 return (a
->r_info
- b
->r_info
);
9556 return (a
->r_addend
- b
->r_addend
);
9561 internal_reloc_matches (const void *ap
, const void *bp
)
9563 const Elf_Internal_Rela
*a
= (const Elf_Internal_Rela
*) ap
;
9564 const Elf_Internal_Rela
*b
= (const Elf_Internal_Rela
*) bp
;
9566 /* Check if one entry overlaps with the other; this shouldn't happen
9567 except when searching for a match. */
9568 return (a
->r_offset
- b
->r_offset
);
9572 /* Predicate function used to look up a section in a particular group. */
9575 match_section_group (bfd
*abfd ATTRIBUTE_UNUSED
, asection
*sec
, void *inf
)
9577 const char *gname
= inf
;
9578 const char *group_name
= elf_group_name (sec
);
9580 return (group_name
== gname
9581 || (group_name
!= NULL
9583 && strcmp (group_name
, gname
) == 0));
9588 xtensa_get_property_section (asection
*sec
, const char *base_name
)
9590 const char *suffix
, *group_name
;
9591 char *prop_sec_name
;
9594 group_name
= elf_group_name (sec
);
9597 suffix
= strrchr (sec
->name
, '.');
9598 if (suffix
== sec
->name
)
9600 prop_sec_name
= (char *) bfd_malloc (strlen (base_name
) + 1
9601 + (suffix
? strlen (suffix
) : 0));
9602 strcpy (prop_sec_name
, base_name
);
9604 strcat (prop_sec_name
, suffix
);
9606 else if (strncmp (sec
->name
, ".gnu.linkonce.", linkonce_len
) == 0)
9608 char *linkonce_kind
= 0;
9610 if (strcmp (base_name
, XTENSA_INSN_SEC_NAME
) == 0)
9611 linkonce_kind
= "x.";
9612 else if (strcmp (base_name
, XTENSA_LIT_SEC_NAME
) == 0)
9613 linkonce_kind
= "p.";
9614 else if (strcmp (base_name
, XTENSA_PROP_SEC_NAME
) == 0)
9615 linkonce_kind
= "prop.";
9619 prop_sec_name
= (char *) bfd_malloc (strlen (sec
->name
)
9620 + strlen (linkonce_kind
) + 1);
9621 memcpy (prop_sec_name
, ".gnu.linkonce.", linkonce_len
);
9622 strcpy (prop_sec_name
+ linkonce_len
, linkonce_kind
);
9624 suffix
= sec
->name
+ linkonce_len
;
9625 /* For backward compatibility, replace "t." instead of inserting
9626 the new linkonce_kind (but not for "prop" sections). */
9627 if (CONST_STRNEQ (suffix
, "t.") && linkonce_kind
[1] == '.')
9629 strcat (prop_sec_name
+ linkonce_len
, suffix
);
9632 prop_sec_name
= strdup (base_name
);
9634 /* Check if the section already exists. */
9635 prop_sec
= bfd_get_section_by_name_if (sec
->owner
, prop_sec_name
,
9636 match_section_group
,
9637 (void *) group_name
);
9638 /* If not, create it. */
9641 flagword flags
= (SEC_RELOC
| SEC_HAS_CONTENTS
| SEC_READONLY
);
9642 flags
|= (bfd_get_section_flags (sec
->owner
, sec
)
9643 & (SEC_LINK_ONCE
| SEC_LINK_DUPLICATES
));
9645 prop_sec
= bfd_make_section_anyway_with_flags
9646 (sec
->owner
, strdup (prop_sec_name
), flags
);
9650 elf_group_name (prop_sec
) = group_name
;
9653 free (prop_sec_name
);
9659 xtensa_get_property_predef_flags (asection
*sec
)
9661 if (CONST_STRNEQ (sec
->name
, XTENSA_INSN_SEC_NAME
)
9662 || CONST_STRNEQ (sec
->name
, ".gnu.linkonce.x."))
9663 return (XTENSA_PROP_INSN
9664 | XTENSA_PROP_INSN_NO_TRANSFORM
9665 | XTENSA_PROP_INSN_NO_REORDER
);
9667 if (xtensa_is_littable_section (sec
))
9668 return (XTENSA_PROP_LITERAL
9669 | XTENSA_PROP_INSN_NO_TRANSFORM
9670 | XTENSA_PROP_INSN_NO_REORDER
);
9676 /* Other functions called directly by the linker. */
9679 xtensa_callback_required_dependence (bfd
*abfd
,
9681 struct bfd_link_info
*link_info
,
9682 deps_callback_t callback
,
9685 Elf_Internal_Rela
*internal_relocs
;
9688 bfd_boolean ok
= TRUE
;
9689 bfd_size_type sec_size
;
9691 sec_size
= bfd_get_section_limit (abfd
, sec
);
9693 /* ".plt*" sections have no explicit relocations but they contain L32R
9694 instructions that reference the corresponding ".got.plt*" sections. */
9695 if ((sec
->flags
& SEC_LINKER_CREATED
) != 0
9696 && CONST_STRNEQ (sec
->name
, ".plt"))
9700 /* Find the corresponding ".got.plt*" section. */
9701 if (sec
->name
[4] == '\0')
9702 sgotplt
= bfd_get_section_by_name (sec
->owner
, ".got.plt");
9708 BFD_ASSERT (sec
->name
[4] == '.');
9709 chunk
= strtol (&sec
->name
[5], NULL
, 10);
9711 sprintf (got_name
, ".got.plt.%u", chunk
);
9712 sgotplt
= bfd_get_section_by_name (sec
->owner
, got_name
);
9714 BFD_ASSERT (sgotplt
);
9716 /* Assume worst-case offsets: L32R at the very end of the ".plt"
9717 section referencing a literal at the very beginning of
9718 ".got.plt". This is very close to the real dependence, anyway. */
9719 (*callback
) (sec
, sec_size
, sgotplt
, 0, closure
);
9722 internal_relocs
= retrieve_internal_relocs (abfd
, sec
,
9723 link_info
->keep_memory
);
9724 if (internal_relocs
== NULL
9725 || sec
->reloc_count
== 0)
9728 /* Cache the contents for the duration of this scan. */
9729 contents
= retrieve_contents (abfd
, sec
, link_info
->keep_memory
);
9730 if (contents
== NULL
&& sec_size
!= 0)
9736 if (!xtensa_default_isa
)
9737 xtensa_default_isa
= xtensa_isa_init (0, 0);
9739 for (i
= 0; i
< sec
->reloc_count
; i
++)
9741 Elf_Internal_Rela
*irel
= &internal_relocs
[i
];
9742 if (is_l32r_relocation (abfd
, sec
, contents
, irel
))
9745 asection
*target_sec
;
9746 bfd_vma target_offset
;
9748 r_reloc_init (&l32r_rel
, abfd
, irel
, contents
, sec_size
);
9751 /* L32Rs must be local to the input file. */
9752 if (r_reloc_is_defined (&l32r_rel
))
9754 target_sec
= r_reloc_get_section (&l32r_rel
);
9755 target_offset
= l32r_rel
.target_offset
;
9757 (*callback
) (sec
, irel
->r_offset
, target_sec
, target_offset
,
9763 release_internal_relocs (sec
, internal_relocs
);
9764 release_contents (sec
, contents
);
9768 /* The default literal sections should always be marked as "code" (i.e.,
9769 SHF_EXECINSTR). This is particularly important for the Linux kernel
9770 module loader so that the literals are not placed after the text. */
9771 static const struct bfd_elf_special_section elf_xtensa_special_sections
[] =
9773 { STRING_COMMA_LEN (".fini.literal"), 0, SHT_PROGBITS
, SHF_ALLOC
+ SHF_EXECINSTR
},
9774 { STRING_COMMA_LEN (".init.literal"), 0, SHT_PROGBITS
, SHF_ALLOC
+ SHF_EXECINSTR
},
9775 { STRING_COMMA_LEN (".literal"), 0, SHT_PROGBITS
, SHF_ALLOC
+ SHF_EXECINSTR
},
9776 { STRING_COMMA_LEN (".xtensa.info"), 0, SHT_NOTE
, 0 },
9777 { NULL
, 0, 0, 0, 0 }
9781 #define TARGET_LITTLE_SYM bfd_elf32_xtensa_le_vec
9782 #define TARGET_LITTLE_NAME "elf32-xtensa-le"
9783 #define TARGET_BIG_SYM bfd_elf32_xtensa_be_vec
9784 #define TARGET_BIG_NAME "elf32-xtensa-be"
9785 #define ELF_ARCH bfd_arch_xtensa
9787 #define ELF_MACHINE_CODE EM_XTENSA
9788 #define ELF_MACHINE_ALT1 EM_XTENSA_OLD
9791 #define ELF_MAXPAGESIZE (1 << XCHAL_MMU_MIN_PTE_PAGE_SIZE)
9792 #else /* !XCHAL_HAVE_MMU */
9793 #define ELF_MAXPAGESIZE 1
9794 #endif /* !XCHAL_HAVE_MMU */
9795 #endif /* ELF_ARCH */
9797 #define elf_backend_can_gc_sections 1
9798 #define elf_backend_can_refcount 1
9799 #define elf_backend_plt_readonly 1
9800 #define elf_backend_got_header_size 4
9801 #define elf_backend_want_dynbss 0
9802 #define elf_backend_want_got_plt 1
9804 #define elf_info_to_howto elf_xtensa_info_to_howto_rela
9806 #define bfd_elf32_bfd_merge_private_bfd_data elf_xtensa_merge_private_bfd_data
9807 #define bfd_elf32_new_section_hook elf_xtensa_new_section_hook
9808 #define bfd_elf32_bfd_print_private_bfd_data elf_xtensa_print_private_bfd_data
9809 #define bfd_elf32_bfd_relax_section elf_xtensa_relax_section
9810 #define bfd_elf32_bfd_reloc_type_lookup elf_xtensa_reloc_type_lookup
9811 #define bfd_elf32_bfd_set_private_flags elf_xtensa_set_private_flags
9812 #define bfd_elf32_bfd_link_hash_table_create elf_xtensa_link_hash_table_create
9814 #define elf_backend_adjust_dynamic_symbol elf_xtensa_adjust_dynamic_symbol
9815 #define elf_backend_check_relocs elf_xtensa_check_relocs
9816 #define elf_backend_create_dynamic_sections elf_xtensa_create_dynamic_sections
9817 #define elf_backend_discard_info elf_xtensa_discard_info
9818 #define elf_backend_ignore_discarded_relocs elf_xtensa_ignore_discarded_relocs
9819 #define elf_backend_final_write_processing elf_xtensa_final_write_processing
9820 #define elf_backend_finish_dynamic_sections elf_xtensa_finish_dynamic_sections
9821 #define elf_backend_finish_dynamic_symbol elf_xtensa_finish_dynamic_symbol
9822 #define elf_backend_gc_mark_hook elf_xtensa_gc_mark_hook
9823 #define elf_backend_gc_sweep_hook elf_xtensa_gc_sweep_hook
9824 #define elf_backend_grok_prstatus elf_xtensa_grok_prstatus
9825 #define elf_backend_grok_psinfo elf_xtensa_grok_psinfo
9826 #define elf_backend_object_p elf_xtensa_object_p
9827 #define elf_backend_reloc_type_class elf_xtensa_reloc_type_class
9828 #define elf_backend_relocate_section elf_xtensa_relocate_section
9829 #define elf_backend_size_dynamic_sections elf_xtensa_size_dynamic_sections
9830 #define elf_backend_omit_section_dynsym \
9831 ((bfd_boolean (*) (bfd *, struct bfd_link_info *, asection *)) bfd_true)
9832 #define elf_backend_special_sections elf_xtensa_special_sections
9833 #define elf_backend_action_discarded elf_xtensa_action_discarded
9835 #include "elf32-target.h"