1 /* Xtensa-specific support for 32-bit ELF.
2 Copyright 2003, 2004, 2005, 2006 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 (bfd
*, 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 (bfd
*, int);
98 static asection
*elf_xtensa_get_gotplt_section (bfd
*, 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 /* Total count of PLT relocations seen during check_relocs.
136 The actual PLT code must be split into multiple sections and all
137 the sections have to be created before size_dynamic_sections,
138 where we figure out the exact number of PLT entries that will be
139 needed. It is OK if this count is an overestimate, e.g., some
140 relocations may be removed by GC. */
142 static int plt_reloc_count
= 0;
145 /* The GNU tools do not easily allow extending interfaces to pass around
146 the pointer to the Xtensa ISA information, so instead we add a global
147 variable here (in BFD) that can be used by any of the tools that need
150 xtensa_isa xtensa_default_isa
;
153 /* When this is true, relocations may have been modified to refer to
154 symbols from other input files. The per-section list of "fix"
155 records needs to be checked when resolving relocations. */
157 static bfd_boolean relaxing_section
= FALSE
;
159 /* When this is true, during final links, literals that cannot be
160 coalesced and their relocations may be moved to other sections. */
162 int elf32xtensa_no_literal_movement
= 1;
165 static reloc_howto_type elf_howto_table
[] =
167 HOWTO (R_XTENSA_NONE
, 0, 0, 0, FALSE
, 0, complain_overflow_dont
,
168 bfd_elf_xtensa_reloc
, "R_XTENSA_NONE",
169 FALSE
, 0x00000000, 0x00000000, FALSE
),
170 HOWTO (R_XTENSA_32
, 0, 2, 32, FALSE
, 0, complain_overflow_bitfield
,
171 bfd_elf_xtensa_reloc
, "R_XTENSA_32",
172 TRUE
, 0xffffffff, 0xffffffff, FALSE
),
173 /* Replace a 32-bit value with a value from the runtime linker (only
174 used by linker-generated stub functions). The r_addend value is
175 special: 1 means to substitute a pointer to the runtime linker's
176 dynamic resolver function; 2 means to substitute the link map for
177 the shared object. */
178 HOWTO (R_XTENSA_RTLD
, 0, 2, 32, FALSE
, 0, complain_overflow_dont
,
179 NULL
, "R_XTENSA_RTLD",
180 FALSE
, 0x00000000, 0x00000000, FALSE
),
181 HOWTO (R_XTENSA_GLOB_DAT
, 0, 2, 32, FALSE
, 0, complain_overflow_bitfield
,
182 bfd_elf_generic_reloc
, "R_XTENSA_GLOB_DAT",
183 FALSE
, 0xffffffff, 0xffffffff, FALSE
),
184 HOWTO (R_XTENSA_JMP_SLOT
, 0, 2, 32, FALSE
, 0, complain_overflow_bitfield
,
185 bfd_elf_generic_reloc
, "R_XTENSA_JMP_SLOT",
186 FALSE
, 0xffffffff, 0xffffffff, FALSE
),
187 HOWTO (R_XTENSA_RELATIVE
, 0, 2, 32, FALSE
, 0, complain_overflow_bitfield
,
188 bfd_elf_generic_reloc
, "R_XTENSA_RELATIVE",
189 FALSE
, 0xffffffff, 0xffffffff, FALSE
),
190 HOWTO (R_XTENSA_PLT
, 0, 2, 32, FALSE
, 0, complain_overflow_bitfield
,
191 bfd_elf_xtensa_reloc
, "R_XTENSA_PLT",
192 FALSE
, 0xffffffff, 0xffffffff, FALSE
),
194 HOWTO (R_XTENSA_OP0
, 0, 0, 0, TRUE
, 0, complain_overflow_dont
,
195 bfd_elf_xtensa_reloc
, "R_XTENSA_OP0",
196 FALSE
, 0x00000000, 0x00000000, TRUE
),
197 HOWTO (R_XTENSA_OP1
, 0, 0, 0, TRUE
, 0, complain_overflow_dont
,
198 bfd_elf_xtensa_reloc
, "R_XTENSA_OP1",
199 FALSE
, 0x00000000, 0x00000000, TRUE
),
200 HOWTO (R_XTENSA_OP2
, 0, 0, 0, TRUE
, 0, complain_overflow_dont
,
201 bfd_elf_xtensa_reloc
, "R_XTENSA_OP2",
202 FALSE
, 0x00000000, 0x00000000, TRUE
),
203 /* Assembly auto-expansion. */
204 HOWTO (R_XTENSA_ASM_EXPAND
, 0, 0, 0, TRUE
, 0, complain_overflow_dont
,
205 bfd_elf_xtensa_reloc
, "R_XTENSA_ASM_EXPAND",
206 FALSE
, 0x00000000, 0x00000000, FALSE
),
207 /* Relax assembly auto-expansion. */
208 HOWTO (R_XTENSA_ASM_SIMPLIFY
, 0, 0, 0, TRUE
, 0, complain_overflow_dont
,
209 bfd_elf_xtensa_reloc
, "R_XTENSA_ASM_SIMPLIFY",
210 FALSE
, 0x00000000, 0x00000000, TRUE
),
213 /* GNU extension to record C++ vtable hierarchy. */
214 HOWTO (R_XTENSA_GNU_VTINHERIT
, 0, 2, 0, FALSE
, 0, complain_overflow_dont
,
215 NULL
, "R_XTENSA_GNU_VTINHERIT",
216 FALSE
, 0x00000000, 0x00000000, FALSE
),
217 /* GNU extension to record C++ vtable member usage. */
218 HOWTO (R_XTENSA_GNU_VTENTRY
, 0, 2, 0, FALSE
, 0, complain_overflow_dont
,
219 _bfd_elf_rel_vtable_reloc_fn
, "R_XTENSA_GNU_VTENTRY",
220 FALSE
, 0x00000000, 0x00000000, FALSE
),
222 /* Relocations for supporting difference of symbols. */
223 HOWTO (R_XTENSA_DIFF8
, 0, 0, 8, FALSE
, 0, complain_overflow_bitfield
,
224 bfd_elf_xtensa_reloc
, "R_XTENSA_DIFF8",
225 FALSE
, 0xffffffff, 0xffffffff, FALSE
),
226 HOWTO (R_XTENSA_DIFF16
, 0, 1, 16, FALSE
, 0, complain_overflow_bitfield
,
227 bfd_elf_xtensa_reloc
, "R_XTENSA_DIFF16",
228 FALSE
, 0xffffffff, 0xffffffff, FALSE
),
229 HOWTO (R_XTENSA_DIFF32
, 0, 2, 32, FALSE
, 0, complain_overflow_bitfield
,
230 bfd_elf_xtensa_reloc
, "R_XTENSA_DIFF32",
231 FALSE
, 0xffffffff, 0xffffffff, FALSE
),
233 /* General immediate operand relocations. */
234 HOWTO (R_XTENSA_SLOT0_OP
, 0, 0, 0, TRUE
, 0, complain_overflow_dont
,
235 bfd_elf_xtensa_reloc
, "R_XTENSA_SLOT0_OP",
236 FALSE
, 0x00000000, 0x00000000, TRUE
),
237 HOWTO (R_XTENSA_SLOT1_OP
, 0, 0, 0, TRUE
, 0, complain_overflow_dont
,
238 bfd_elf_xtensa_reloc
, "R_XTENSA_SLOT1_OP",
239 FALSE
, 0x00000000, 0x00000000, TRUE
),
240 HOWTO (R_XTENSA_SLOT2_OP
, 0, 0, 0, TRUE
, 0, complain_overflow_dont
,
241 bfd_elf_xtensa_reloc
, "R_XTENSA_SLOT2_OP",
242 FALSE
, 0x00000000, 0x00000000, TRUE
),
243 HOWTO (R_XTENSA_SLOT3_OP
, 0, 0, 0, TRUE
, 0, complain_overflow_dont
,
244 bfd_elf_xtensa_reloc
, "R_XTENSA_SLOT3_OP",
245 FALSE
, 0x00000000, 0x00000000, TRUE
),
246 HOWTO (R_XTENSA_SLOT4_OP
, 0, 0, 0, TRUE
, 0, complain_overflow_dont
,
247 bfd_elf_xtensa_reloc
, "R_XTENSA_SLOT4_OP",
248 FALSE
, 0x00000000, 0x00000000, TRUE
),
249 HOWTO (R_XTENSA_SLOT5_OP
, 0, 0, 0, TRUE
, 0, complain_overflow_dont
,
250 bfd_elf_xtensa_reloc
, "R_XTENSA_SLOT5_OP",
251 FALSE
, 0x00000000, 0x00000000, TRUE
),
252 HOWTO (R_XTENSA_SLOT6_OP
, 0, 0, 0, TRUE
, 0, complain_overflow_dont
,
253 bfd_elf_xtensa_reloc
, "R_XTENSA_SLOT6_OP",
254 FALSE
, 0x00000000, 0x00000000, TRUE
),
255 HOWTO (R_XTENSA_SLOT7_OP
, 0, 0, 0, TRUE
, 0, complain_overflow_dont
,
256 bfd_elf_xtensa_reloc
, "R_XTENSA_SLOT7_OP",
257 FALSE
, 0x00000000, 0x00000000, TRUE
),
258 HOWTO (R_XTENSA_SLOT8_OP
, 0, 0, 0, TRUE
, 0, complain_overflow_dont
,
259 bfd_elf_xtensa_reloc
, "R_XTENSA_SLOT8_OP",
260 FALSE
, 0x00000000, 0x00000000, TRUE
),
261 HOWTO (R_XTENSA_SLOT9_OP
, 0, 0, 0, TRUE
, 0, complain_overflow_dont
,
262 bfd_elf_xtensa_reloc
, "R_XTENSA_SLOT9_OP",
263 FALSE
, 0x00000000, 0x00000000, TRUE
),
264 HOWTO (R_XTENSA_SLOT10_OP
, 0, 0, 0, TRUE
, 0, complain_overflow_dont
,
265 bfd_elf_xtensa_reloc
, "R_XTENSA_SLOT10_OP",
266 FALSE
, 0x00000000, 0x00000000, TRUE
),
267 HOWTO (R_XTENSA_SLOT11_OP
, 0, 0, 0, TRUE
, 0, complain_overflow_dont
,
268 bfd_elf_xtensa_reloc
, "R_XTENSA_SLOT11_OP",
269 FALSE
, 0x00000000, 0x00000000, TRUE
),
270 HOWTO (R_XTENSA_SLOT12_OP
, 0, 0, 0, TRUE
, 0, complain_overflow_dont
,
271 bfd_elf_xtensa_reloc
, "R_XTENSA_SLOT12_OP",
272 FALSE
, 0x00000000, 0x00000000, TRUE
),
273 HOWTO (R_XTENSA_SLOT13_OP
, 0, 0, 0, TRUE
, 0, complain_overflow_dont
,
274 bfd_elf_xtensa_reloc
, "R_XTENSA_SLOT13_OP",
275 FALSE
, 0x00000000, 0x00000000, TRUE
),
276 HOWTO (R_XTENSA_SLOT14_OP
, 0, 0, 0, TRUE
, 0, complain_overflow_dont
,
277 bfd_elf_xtensa_reloc
, "R_XTENSA_SLOT14_OP",
278 FALSE
, 0x00000000, 0x00000000, TRUE
),
280 /* "Alternate" relocations. The meaning of these is opcode-specific. */
281 HOWTO (R_XTENSA_SLOT0_ALT
, 0, 0, 0, TRUE
, 0, complain_overflow_dont
,
282 bfd_elf_xtensa_reloc
, "R_XTENSA_SLOT0_ALT",
283 FALSE
, 0x00000000, 0x00000000, TRUE
),
284 HOWTO (R_XTENSA_SLOT1_ALT
, 0, 0, 0, TRUE
, 0, complain_overflow_dont
,
285 bfd_elf_xtensa_reloc
, "R_XTENSA_SLOT1_ALT",
286 FALSE
, 0x00000000, 0x00000000, TRUE
),
287 HOWTO (R_XTENSA_SLOT2_ALT
, 0, 0, 0, TRUE
, 0, complain_overflow_dont
,
288 bfd_elf_xtensa_reloc
, "R_XTENSA_SLOT2_ALT",
289 FALSE
, 0x00000000, 0x00000000, TRUE
),
290 HOWTO (R_XTENSA_SLOT3_ALT
, 0, 0, 0, TRUE
, 0, complain_overflow_dont
,
291 bfd_elf_xtensa_reloc
, "R_XTENSA_SLOT3_ALT",
292 FALSE
, 0x00000000, 0x00000000, TRUE
),
293 HOWTO (R_XTENSA_SLOT4_ALT
, 0, 0, 0, TRUE
, 0, complain_overflow_dont
,
294 bfd_elf_xtensa_reloc
, "R_XTENSA_SLOT4_ALT",
295 FALSE
, 0x00000000, 0x00000000, TRUE
),
296 HOWTO (R_XTENSA_SLOT5_ALT
, 0, 0, 0, TRUE
, 0, complain_overflow_dont
,
297 bfd_elf_xtensa_reloc
, "R_XTENSA_SLOT5_ALT",
298 FALSE
, 0x00000000, 0x00000000, TRUE
),
299 HOWTO (R_XTENSA_SLOT6_ALT
, 0, 0, 0, TRUE
, 0, complain_overflow_dont
,
300 bfd_elf_xtensa_reloc
, "R_XTENSA_SLOT6_ALT",
301 FALSE
, 0x00000000, 0x00000000, TRUE
),
302 HOWTO (R_XTENSA_SLOT7_ALT
, 0, 0, 0, TRUE
, 0, complain_overflow_dont
,
303 bfd_elf_xtensa_reloc
, "R_XTENSA_SLOT7_ALT",
304 FALSE
, 0x00000000, 0x00000000, TRUE
),
305 HOWTO (R_XTENSA_SLOT8_ALT
, 0, 0, 0, TRUE
, 0, complain_overflow_dont
,
306 bfd_elf_xtensa_reloc
, "R_XTENSA_SLOT8_ALT",
307 FALSE
, 0x00000000, 0x00000000, TRUE
),
308 HOWTO (R_XTENSA_SLOT9_ALT
, 0, 0, 0, TRUE
, 0, complain_overflow_dont
,
309 bfd_elf_xtensa_reloc
, "R_XTENSA_SLOT9_ALT",
310 FALSE
, 0x00000000, 0x00000000, TRUE
),
311 HOWTO (R_XTENSA_SLOT10_ALT
, 0, 0, 0, TRUE
, 0, complain_overflow_dont
,
312 bfd_elf_xtensa_reloc
, "R_XTENSA_SLOT10_ALT",
313 FALSE
, 0x00000000, 0x00000000, TRUE
),
314 HOWTO (R_XTENSA_SLOT11_ALT
, 0, 0, 0, TRUE
, 0, complain_overflow_dont
,
315 bfd_elf_xtensa_reloc
, "R_XTENSA_SLOT11_ALT",
316 FALSE
, 0x00000000, 0x00000000, TRUE
),
317 HOWTO (R_XTENSA_SLOT12_ALT
, 0, 0, 0, TRUE
, 0, complain_overflow_dont
,
318 bfd_elf_xtensa_reloc
, "R_XTENSA_SLOT12_ALT",
319 FALSE
, 0x00000000, 0x00000000, TRUE
),
320 HOWTO (R_XTENSA_SLOT13_ALT
, 0, 0, 0, TRUE
, 0, complain_overflow_dont
,
321 bfd_elf_xtensa_reloc
, "R_XTENSA_SLOT13_ALT",
322 FALSE
, 0x00000000, 0x00000000, TRUE
),
323 HOWTO (R_XTENSA_SLOT14_ALT
, 0, 0, 0, TRUE
, 0, complain_overflow_dont
,
324 bfd_elf_xtensa_reloc
, "R_XTENSA_SLOT14_ALT",
325 FALSE
, 0x00000000, 0x00000000, TRUE
)
330 fprintf (stderr, "Xtensa bfd reloc lookup %d (%s)\n", code, str)
335 static reloc_howto_type
*
336 elf_xtensa_reloc_type_lookup (bfd
*abfd ATTRIBUTE_UNUSED
,
337 bfd_reloc_code_real_type code
)
342 TRACE ("BFD_RELOC_NONE");
343 return &elf_howto_table
[(unsigned) R_XTENSA_NONE
];
346 TRACE ("BFD_RELOC_32");
347 return &elf_howto_table
[(unsigned) R_XTENSA_32
];
349 case BFD_RELOC_XTENSA_DIFF8
:
350 TRACE ("BFD_RELOC_XTENSA_DIFF8");
351 return &elf_howto_table
[(unsigned) R_XTENSA_DIFF8
];
353 case BFD_RELOC_XTENSA_DIFF16
:
354 TRACE ("BFD_RELOC_XTENSA_DIFF16");
355 return &elf_howto_table
[(unsigned) R_XTENSA_DIFF16
];
357 case BFD_RELOC_XTENSA_DIFF32
:
358 TRACE ("BFD_RELOC_XTENSA_DIFF32");
359 return &elf_howto_table
[(unsigned) R_XTENSA_DIFF32
];
361 case BFD_RELOC_XTENSA_RTLD
:
362 TRACE ("BFD_RELOC_XTENSA_RTLD");
363 return &elf_howto_table
[(unsigned) R_XTENSA_RTLD
];
365 case BFD_RELOC_XTENSA_GLOB_DAT
:
366 TRACE ("BFD_RELOC_XTENSA_GLOB_DAT");
367 return &elf_howto_table
[(unsigned) R_XTENSA_GLOB_DAT
];
369 case BFD_RELOC_XTENSA_JMP_SLOT
:
370 TRACE ("BFD_RELOC_XTENSA_JMP_SLOT");
371 return &elf_howto_table
[(unsigned) R_XTENSA_JMP_SLOT
];
373 case BFD_RELOC_XTENSA_RELATIVE
:
374 TRACE ("BFD_RELOC_XTENSA_RELATIVE");
375 return &elf_howto_table
[(unsigned) R_XTENSA_RELATIVE
];
377 case BFD_RELOC_XTENSA_PLT
:
378 TRACE ("BFD_RELOC_XTENSA_PLT");
379 return &elf_howto_table
[(unsigned) R_XTENSA_PLT
];
381 case BFD_RELOC_XTENSA_OP0
:
382 TRACE ("BFD_RELOC_XTENSA_OP0");
383 return &elf_howto_table
[(unsigned) R_XTENSA_OP0
];
385 case BFD_RELOC_XTENSA_OP1
:
386 TRACE ("BFD_RELOC_XTENSA_OP1");
387 return &elf_howto_table
[(unsigned) R_XTENSA_OP1
];
389 case BFD_RELOC_XTENSA_OP2
:
390 TRACE ("BFD_RELOC_XTENSA_OP2");
391 return &elf_howto_table
[(unsigned) R_XTENSA_OP2
];
393 case BFD_RELOC_XTENSA_ASM_EXPAND
:
394 TRACE ("BFD_RELOC_XTENSA_ASM_EXPAND");
395 return &elf_howto_table
[(unsigned) R_XTENSA_ASM_EXPAND
];
397 case BFD_RELOC_XTENSA_ASM_SIMPLIFY
:
398 TRACE ("BFD_RELOC_XTENSA_ASM_SIMPLIFY");
399 return &elf_howto_table
[(unsigned) R_XTENSA_ASM_SIMPLIFY
];
401 case BFD_RELOC_VTABLE_INHERIT
:
402 TRACE ("BFD_RELOC_VTABLE_INHERIT");
403 return &elf_howto_table
[(unsigned) R_XTENSA_GNU_VTINHERIT
];
405 case BFD_RELOC_VTABLE_ENTRY
:
406 TRACE ("BFD_RELOC_VTABLE_ENTRY");
407 return &elf_howto_table
[(unsigned) R_XTENSA_GNU_VTENTRY
];
410 if (code
>= BFD_RELOC_XTENSA_SLOT0_OP
411 && code
<= BFD_RELOC_XTENSA_SLOT14_OP
)
413 unsigned n
= (R_XTENSA_SLOT0_OP
+
414 (code
- BFD_RELOC_XTENSA_SLOT0_OP
));
415 return &elf_howto_table
[n
];
418 if (code
>= BFD_RELOC_XTENSA_SLOT0_ALT
419 && code
<= BFD_RELOC_XTENSA_SLOT14_ALT
)
421 unsigned n
= (R_XTENSA_SLOT0_ALT
+
422 (code
- BFD_RELOC_XTENSA_SLOT0_ALT
));
423 return &elf_howto_table
[n
];
434 /* Given an ELF "rela" relocation, find the corresponding howto and record
435 it in the BFD internal arelent representation of the relocation. */
438 elf_xtensa_info_to_howto_rela (bfd
*abfd ATTRIBUTE_UNUSED
,
440 Elf_Internal_Rela
*dst
)
442 unsigned int r_type
= ELF32_R_TYPE (dst
->r_info
);
444 BFD_ASSERT (r_type
< (unsigned int) R_XTENSA_max
);
445 cache_ptr
->howto
= &elf_howto_table
[r_type
];
449 /* Functions for the Xtensa ELF linker. */
451 /* The name of the dynamic interpreter. This is put in the .interp
454 #define ELF_DYNAMIC_INTERPRETER "/lib/ld.so"
456 /* The size in bytes of an entry in the procedure linkage table.
457 (This does _not_ include the space for the literals associated with
460 #define PLT_ENTRY_SIZE 16
462 /* For _really_ large PLTs, we may need to alternate between literals
463 and code to keep the literals within the 256K range of the L32R
464 instructions in the code. It's unlikely that anyone would ever need
465 such a big PLT, but an arbitrary limit on the PLT size would be bad.
466 Thus, we split the PLT into chunks. Since there's very little
467 overhead (2 extra literals) for each chunk, the chunk size is kept
468 small so that the code for handling multiple chunks get used and
469 tested regularly. With 254 entries, there are 1K of literals for
470 each chunk, and that seems like a nice round number. */
472 #define PLT_ENTRIES_PER_CHUNK 254
474 /* PLT entries are actually used as stub functions for lazy symbol
475 resolution. Once the symbol is resolved, the stub function is never
476 invoked. Note: the 32-byte frame size used here cannot be changed
477 without a corresponding change in the runtime linker. */
479 static const bfd_byte elf_xtensa_be_plt_entry
[PLT_ENTRY_SIZE
] =
481 0x6c, 0x10, 0x04, /* entry sp, 32 */
482 0x18, 0x00, 0x00, /* l32r a8, [got entry for rtld's resolver] */
483 0x1a, 0x00, 0x00, /* l32r a10, [got entry for rtld's link map] */
484 0x1b, 0x00, 0x00, /* l32r a11, [literal for reloc index] */
485 0x0a, 0x80, 0x00, /* jx a8 */
489 static const bfd_byte elf_xtensa_le_plt_entry
[PLT_ENTRY_SIZE
] =
491 0x36, 0x41, 0x00, /* entry sp, 32 */
492 0x81, 0x00, 0x00, /* l32r a8, [got entry for rtld's resolver] */
493 0xa1, 0x00, 0x00, /* l32r a10, [got entry for rtld's link map] */
494 0xb1, 0x00, 0x00, /* l32r a11, [literal for reloc index] */
495 0xa0, 0x08, 0x00, /* jx a8 */
500 static inline bfd_boolean
501 xtensa_elf_dynamic_symbol_p (struct elf_link_hash_entry
*h
,
502 struct bfd_link_info
*info
)
504 /* Check if we should do dynamic things to this symbol. The
505 "ignore_protected" argument need not be set, because Xtensa code
506 does not require special handling of STV_PROTECTED to make function
507 pointer comparisons work properly. The PLT addresses are never
508 used for function pointers. */
510 return _bfd_elf_dynamic_symbol_p (h
, info
, 0);
515 property_table_compare (const void *ap
, const void *bp
)
517 const property_table_entry
*a
= (const property_table_entry
*) ap
;
518 const property_table_entry
*b
= (const property_table_entry
*) bp
;
520 if (a
->address
== b
->address
)
522 if (a
->size
!= b
->size
)
523 return (a
->size
- b
->size
);
525 if ((a
->flags
& XTENSA_PROP_ALIGN
) != (b
->flags
& XTENSA_PROP_ALIGN
))
526 return ((b
->flags
& XTENSA_PROP_ALIGN
)
527 - (a
->flags
& XTENSA_PROP_ALIGN
));
529 if ((a
->flags
& XTENSA_PROP_ALIGN
)
530 && (GET_XTENSA_PROP_ALIGNMENT (a
->flags
)
531 != GET_XTENSA_PROP_ALIGNMENT (b
->flags
)))
532 return (GET_XTENSA_PROP_ALIGNMENT (a
->flags
)
533 - GET_XTENSA_PROP_ALIGNMENT (b
->flags
));
535 if ((a
->flags
& XTENSA_PROP_UNREACHABLE
)
536 != (b
->flags
& XTENSA_PROP_UNREACHABLE
))
537 return ((b
->flags
& XTENSA_PROP_UNREACHABLE
)
538 - (a
->flags
& XTENSA_PROP_UNREACHABLE
));
540 return (a
->flags
- b
->flags
);
543 return (a
->address
- b
->address
);
548 property_table_matches (const void *ap
, const void *bp
)
550 const property_table_entry
*a
= (const property_table_entry
*) ap
;
551 const property_table_entry
*b
= (const property_table_entry
*) bp
;
553 /* Check if one entry overlaps with the other. */
554 if ((b
->address
>= a
->address
&& b
->address
< (a
->address
+ a
->size
))
555 || (a
->address
>= b
->address
&& a
->address
< (b
->address
+ b
->size
)))
558 return (a
->address
- b
->address
);
562 /* Get the literal table or property table entries for the given
563 section. Sets TABLE_P and returns the number of entries. On
564 error, returns a negative value. */
567 xtensa_read_table_entries (bfd
*abfd
,
569 property_table_entry
**table_p
,
570 const char *sec_name
,
571 bfd_boolean output_addr
)
573 asection
*table_section
;
574 bfd_size_type table_size
= 0;
575 bfd_byte
*table_data
;
576 property_table_entry
*blocks
;
577 int blk
, block_count
;
578 bfd_size_type num_records
;
579 Elf_Internal_Rela
*internal_relocs
;
580 bfd_vma section_addr
;
581 flagword predef_flags
;
582 bfd_size_type table_entry_size
;
585 || !(section
->flags
& SEC_ALLOC
)
586 || (section
->flags
& SEC_DEBUGGING
))
592 table_section
= xtensa_get_property_section (section
, sec_name
);
594 table_size
= table_section
->size
;
602 predef_flags
= xtensa_get_property_predef_flags (table_section
);
603 table_entry_size
= 12;
605 table_entry_size
-= 4;
607 num_records
= table_size
/ table_entry_size
;
608 table_data
= retrieve_contents (abfd
, table_section
, TRUE
);
609 blocks
= (property_table_entry
*)
610 bfd_malloc (num_records
* sizeof (property_table_entry
));
614 section_addr
= section
->output_section
->vma
+ section
->output_offset
;
616 section_addr
= section
->vma
;
618 /* If the file has not yet been relocated, process the relocations
619 and sort out the table entries that apply to the specified section. */
620 internal_relocs
= retrieve_internal_relocs (abfd
, table_section
, TRUE
);
621 if (internal_relocs
&& !table_section
->reloc_done
)
625 for (i
= 0; i
< table_section
->reloc_count
; i
++)
627 Elf_Internal_Rela
*rel
= &internal_relocs
[i
];
628 unsigned long r_symndx
;
630 if (ELF32_R_TYPE (rel
->r_info
) == R_XTENSA_NONE
)
633 BFD_ASSERT (ELF32_R_TYPE (rel
->r_info
) == R_XTENSA_32
);
634 r_symndx
= ELF32_R_SYM (rel
->r_info
);
636 if (get_elf_r_symndx_section (abfd
, r_symndx
) == section
)
638 bfd_vma sym_off
= get_elf_r_symndx_offset (abfd
, r_symndx
);
639 BFD_ASSERT (sym_off
== 0);
640 blocks
[block_count
].address
=
641 (section_addr
+ sym_off
+ rel
->r_addend
642 + bfd_get_32 (abfd
, table_data
+ rel
->r_offset
));
643 blocks
[block_count
].size
=
644 bfd_get_32 (abfd
, table_data
+ rel
->r_offset
+ 4);
646 blocks
[block_count
].flags
= predef_flags
;
648 blocks
[block_count
].flags
=
649 bfd_get_32 (abfd
, table_data
+ rel
->r_offset
+ 8);
656 /* The file has already been relocated and the addresses are
657 already in the table. */
659 bfd_size_type section_limit
= bfd_get_section_limit (abfd
, section
);
661 for (off
= 0; off
< table_size
; off
+= table_entry_size
)
663 bfd_vma address
= bfd_get_32 (abfd
, table_data
+ off
);
665 if (address
>= section_addr
666 && address
< section_addr
+ section_limit
)
668 blocks
[block_count
].address
= address
;
669 blocks
[block_count
].size
=
670 bfd_get_32 (abfd
, table_data
+ off
+ 4);
672 blocks
[block_count
].flags
= predef_flags
;
674 blocks
[block_count
].flags
=
675 bfd_get_32 (abfd
, table_data
+ off
+ 8);
681 release_contents (table_section
, table_data
);
682 release_internal_relocs (table_section
, internal_relocs
);
686 /* Now sort them into address order for easy reference. */
687 qsort (blocks
, block_count
, sizeof (property_table_entry
),
688 property_table_compare
);
690 /* Check that the table contents are valid. Problems may occur,
691 for example, if an unrelocated object file is stripped. */
692 for (blk
= 1; blk
< block_count
; blk
++)
694 /* The only circumstance where two entries may legitimately
695 have the same address is when one of them is a zero-size
696 placeholder to mark a place where fill can be inserted.
697 The zero-size entry should come first. */
698 if (blocks
[blk
- 1].address
== blocks
[blk
].address
&&
699 blocks
[blk
- 1].size
!= 0)
701 (*_bfd_error_handler
) (_("%B(%A): invalid property table"),
703 bfd_set_error (bfd_error_bad_value
);
715 static property_table_entry
*
716 elf_xtensa_find_property_entry (property_table_entry
*property_table
,
717 int property_table_size
,
720 property_table_entry entry
;
721 property_table_entry
*rv
;
723 if (property_table_size
== 0)
726 entry
.address
= addr
;
730 rv
= bsearch (&entry
, property_table
, property_table_size
,
731 sizeof (property_table_entry
), property_table_matches
);
737 elf_xtensa_in_literal_pool (property_table_entry
*lit_table
,
741 if (elf_xtensa_find_property_entry (lit_table
, lit_table_size
, addr
))
748 /* Look through the relocs for a section during the first phase, and
749 calculate needed space in the dynamic reloc sections. */
752 elf_xtensa_check_relocs (bfd
*abfd
,
753 struct bfd_link_info
*info
,
755 const Elf_Internal_Rela
*relocs
)
757 Elf_Internal_Shdr
*symtab_hdr
;
758 struct elf_link_hash_entry
**sym_hashes
;
759 const Elf_Internal_Rela
*rel
;
760 const Elf_Internal_Rela
*rel_end
;
762 if (info
->relocatable
)
765 symtab_hdr
= &elf_tdata (abfd
)->symtab_hdr
;
766 sym_hashes
= elf_sym_hashes (abfd
);
768 rel_end
= relocs
+ sec
->reloc_count
;
769 for (rel
= relocs
; rel
< rel_end
; rel
++)
772 unsigned long r_symndx
;
773 struct elf_link_hash_entry
*h
;
775 r_symndx
= ELF32_R_SYM (rel
->r_info
);
776 r_type
= ELF32_R_TYPE (rel
->r_info
);
778 if (r_symndx
>= NUM_SHDR_ENTRIES (symtab_hdr
))
780 (*_bfd_error_handler
) (_("%B: bad symbol index: %d"),
785 if (r_symndx
< symtab_hdr
->sh_info
)
789 h
= sym_hashes
[r_symndx
- symtab_hdr
->sh_info
];
790 while (h
->root
.type
== bfd_link_hash_indirect
791 || h
->root
.type
== bfd_link_hash_warning
)
792 h
= (struct elf_link_hash_entry
*) h
->root
.u
.i
.link
;
801 if ((sec
->flags
& SEC_ALLOC
) != 0)
803 if (h
->got
.refcount
<= 0)
806 h
->got
.refcount
+= 1;
811 /* If this relocation is against a local symbol, then it's
812 exactly the same as a normal local GOT entry. */
816 if ((sec
->flags
& SEC_ALLOC
) != 0)
818 if (h
->plt
.refcount
<= 0)
824 h
->plt
.refcount
+= 1;
826 /* Keep track of the total PLT relocation count even if we
827 don't yet know whether the dynamic sections will be
829 plt_reloc_count
+= 1;
831 if (elf_hash_table (info
)->dynamic_sections_created
)
833 if (!add_extra_plt_sections (elf_hash_table (info
)->dynobj
,
841 if ((sec
->flags
& SEC_ALLOC
) != 0)
843 bfd_signed_vma
*local_got_refcounts
;
845 /* This is a global offset table entry for a local symbol. */
846 local_got_refcounts
= elf_local_got_refcounts (abfd
);
847 if (local_got_refcounts
== NULL
)
851 size
= symtab_hdr
->sh_info
;
852 size
*= sizeof (bfd_signed_vma
);
853 local_got_refcounts
=
854 (bfd_signed_vma
*) bfd_zalloc (abfd
, size
);
855 if (local_got_refcounts
== NULL
)
857 elf_local_got_refcounts (abfd
) = local_got_refcounts
;
859 local_got_refcounts
[r_symndx
] += 1;
866 case R_XTENSA_SLOT0_OP
:
867 case R_XTENSA_SLOT1_OP
:
868 case R_XTENSA_SLOT2_OP
:
869 case R_XTENSA_SLOT3_OP
:
870 case R_XTENSA_SLOT4_OP
:
871 case R_XTENSA_SLOT5_OP
:
872 case R_XTENSA_SLOT6_OP
:
873 case R_XTENSA_SLOT7_OP
:
874 case R_XTENSA_SLOT8_OP
:
875 case R_XTENSA_SLOT9_OP
:
876 case R_XTENSA_SLOT10_OP
:
877 case R_XTENSA_SLOT11_OP
:
878 case R_XTENSA_SLOT12_OP
:
879 case R_XTENSA_SLOT13_OP
:
880 case R_XTENSA_SLOT14_OP
:
881 case R_XTENSA_SLOT0_ALT
:
882 case R_XTENSA_SLOT1_ALT
:
883 case R_XTENSA_SLOT2_ALT
:
884 case R_XTENSA_SLOT3_ALT
:
885 case R_XTENSA_SLOT4_ALT
:
886 case R_XTENSA_SLOT5_ALT
:
887 case R_XTENSA_SLOT6_ALT
:
888 case R_XTENSA_SLOT7_ALT
:
889 case R_XTENSA_SLOT8_ALT
:
890 case R_XTENSA_SLOT9_ALT
:
891 case R_XTENSA_SLOT10_ALT
:
892 case R_XTENSA_SLOT11_ALT
:
893 case R_XTENSA_SLOT12_ALT
:
894 case R_XTENSA_SLOT13_ALT
:
895 case R_XTENSA_SLOT14_ALT
:
896 case R_XTENSA_ASM_EXPAND
:
897 case R_XTENSA_ASM_SIMPLIFY
:
899 case R_XTENSA_DIFF16
:
900 case R_XTENSA_DIFF32
:
901 /* Nothing to do for these. */
904 case R_XTENSA_GNU_VTINHERIT
:
905 /* This relocation describes the C++ object vtable hierarchy.
906 Reconstruct it for later use during GC. */
907 if (!bfd_elf_gc_record_vtinherit (abfd
, sec
, h
, rel
->r_offset
))
911 case R_XTENSA_GNU_VTENTRY
:
912 /* This relocation describes which C++ vtable entries are actually
913 used. Record for later use during GC. */
914 if (!bfd_elf_gc_record_vtentry (abfd
, sec
, h
, rel
->r_addend
))
928 elf_xtensa_make_sym_local (struct bfd_link_info
*info
,
929 struct elf_link_hash_entry
*h
)
933 if (h
->plt
.refcount
> 0)
935 /* Will use RELATIVE relocs instead of JMP_SLOT relocs. */
936 if (h
->got
.refcount
< 0)
938 h
->got
.refcount
+= h
->plt
.refcount
;
944 /* Don't need any dynamic relocations at all. */
952 elf_xtensa_hide_symbol (struct bfd_link_info
*info
,
953 struct elf_link_hash_entry
*h
,
954 bfd_boolean force_local
)
956 /* For a shared link, move the plt refcount to the got refcount to leave
957 space for RELATIVE relocs. */
958 elf_xtensa_make_sym_local (info
, h
);
960 _bfd_elf_link_hash_hide_symbol (info
, h
, force_local
);
964 /* Return the section that should be marked against GC for a given
968 elf_xtensa_gc_mark_hook (asection
*sec
,
969 struct bfd_link_info
*info
,
970 Elf_Internal_Rela
*rel
,
971 struct elf_link_hash_entry
*h
,
972 Elf_Internal_Sym
*sym
)
975 switch (ELF32_R_TYPE (rel
->r_info
))
977 case R_XTENSA_GNU_VTINHERIT
:
978 case R_XTENSA_GNU_VTENTRY
:
982 return _bfd_elf_gc_mark_hook (sec
, info
, rel
, h
, sym
);
986 /* Update the GOT & PLT entry reference counts
987 for the section being removed. */
990 elf_xtensa_gc_sweep_hook (bfd
*abfd
,
991 struct bfd_link_info
*info ATTRIBUTE_UNUSED
,
993 const Elf_Internal_Rela
*relocs
)
995 Elf_Internal_Shdr
*symtab_hdr
;
996 struct elf_link_hash_entry
**sym_hashes
;
997 bfd_signed_vma
*local_got_refcounts
;
998 const Elf_Internal_Rela
*rel
, *relend
;
1000 if ((sec
->flags
& SEC_ALLOC
) == 0)
1003 symtab_hdr
= &elf_tdata (abfd
)->symtab_hdr
;
1004 sym_hashes
= elf_sym_hashes (abfd
);
1005 local_got_refcounts
= elf_local_got_refcounts (abfd
);
1007 relend
= relocs
+ sec
->reloc_count
;
1008 for (rel
= relocs
; rel
< relend
; rel
++)
1010 unsigned long r_symndx
;
1011 unsigned int r_type
;
1012 struct elf_link_hash_entry
*h
= NULL
;
1014 r_symndx
= ELF32_R_SYM (rel
->r_info
);
1015 if (r_symndx
>= symtab_hdr
->sh_info
)
1017 h
= sym_hashes
[r_symndx
- symtab_hdr
->sh_info
];
1018 while (h
->root
.type
== bfd_link_hash_indirect
1019 || h
->root
.type
== bfd_link_hash_warning
)
1020 h
= (struct elf_link_hash_entry
*) h
->root
.u
.i
.link
;
1023 r_type
= ELF32_R_TYPE (rel
->r_info
);
1029 if (h
->got
.refcount
> 0)
1036 if (h
->plt
.refcount
> 0)
1041 if (local_got_refcounts
[r_symndx
] > 0)
1042 local_got_refcounts
[r_symndx
] -= 1;
1054 /* Create all the dynamic sections. */
1057 elf_xtensa_create_dynamic_sections (bfd
*dynobj
, struct bfd_link_info
*info
)
1059 flagword flags
, noalloc_flags
;
1062 /* First do all the standard stuff. */
1063 if (! _bfd_elf_create_dynamic_sections (dynobj
, info
))
1066 /* Create any extra PLT sections in case check_relocs has already
1067 been called on all the non-dynamic input files. */
1068 if (!add_extra_plt_sections (dynobj
, plt_reloc_count
))
1071 noalloc_flags
= (SEC_HAS_CONTENTS
| SEC_IN_MEMORY
1072 | SEC_LINKER_CREATED
| SEC_READONLY
);
1073 flags
= noalloc_flags
| SEC_ALLOC
| SEC_LOAD
;
1075 /* Mark the ".got.plt" section READONLY. */
1076 s
= bfd_get_section_by_name (dynobj
, ".got.plt");
1078 || ! bfd_set_section_flags (dynobj
, s
, flags
))
1081 /* Create ".rela.got". */
1082 s
= bfd_make_section_with_flags (dynobj
, ".rela.got", flags
);
1084 || ! bfd_set_section_alignment (dynobj
, s
, 2))
1087 /* Create ".got.loc" (literal tables for use by dynamic linker). */
1088 s
= bfd_make_section_with_flags (dynobj
, ".got.loc", flags
);
1090 || ! bfd_set_section_alignment (dynobj
, s
, 2))
1093 /* Create ".xt.lit.plt" (literal table for ".got.plt*"). */
1094 s
= bfd_make_section_with_flags (dynobj
, ".xt.lit.plt",
1097 || ! bfd_set_section_alignment (dynobj
, s
, 2))
1105 add_extra_plt_sections (bfd
*dynobj
, int count
)
1109 /* Iterate over all chunks except 0 which uses the standard ".plt" and
1110 ".got.plt" sections. */
1111 for (chunk
= count
/ PLT_ENTRIES_PER_CHUNK
; chunk
> 0; chunk
--)
1117 /* Stop when we find a section has already been created. */
1118 if (elf_xtensa_get_plt_section (dynobj
, chunk
))
1121 flags
= (SEC_ALLOC
| SEC_LOAD
| SEC_HAS_CONTENTS
| SEC_IN_MEMORY
1122 | SEC_LINKER_CREATED
| SEC_READONLY
);
1124 sname
= (char *) bfd_malloc (10);
1125 sprintf (sname
, ".plt.%u", chunk
);
1126 s
= bfd_make_section_with_flags (dynobj
, sname
,
1129 || ! bfd_set_section_alignment (dynobj
, s
, 2))
1132 sname
= (char *) bfd_malloc (14);
1133 sprintf (sname
, ".got.plt.%u", chunk
);
1134 s
= bfd_make_section_with_flags (dynobj
, sname
, flags
);
1136 || ! bfd_set_section_alignment (dynobj
, s
, 2))
1144 /* Adjust a symbol defined by a dynamic object and referenced by a
1145 regular object. The current definition is in some section of the
1146 dynamic object, but we're not including those sections. We have to
1147 change the definition to something the rest of the link can
1151 elf_xtensa_adjust_dynamic_symbol (struct bfd_link_info
*info ATTRIBUTE_UNUSED
,
1152 struct elf_link_hash_entry
*h
)
1154 /* If this is a weak symbol, and there is a real definition, the
1155 processor independent code will have arranged for us to see the
1156 real definition first, and we can just use the same value. */
1159 BFD_ASSERT (h
->u
.weakdef
->root
.type
== bfd_link_hash_defined
1160 || h
->u
.weakdef
->root
.type
== bfd_link_hash_defweak
);
1161 h
->root
.u
.def
.section
= h
->u
.weakdef
->root
.u
.def
.section
;
1162 h
->root
.u
.def
.value
= h
->u
.weakdef
->root
.u
.def
.value
;
1166 /* This is a reference to a symbol defined by a dynamic object. The
1167 reference must go through the GOT, so there's no need for COPY relocs,
1175 elf_xtensa_fix_refcounts (struct elf_link_hash_entry
*h
, void *arg
)
1177 struct bfd_link_info
*info
= (struct bfd_link_info
*) arg
;
1179 if (h
->root
.type
== bfd_link_hash_warning
)
1180 h
= (struct elf_link_hash_entry
*) h
->root
.u
.i
.link
;
1182 if (! xtensa_elf_dynamic_symbol_p (h
, info
))
1183 elf_xtensa_make_sym_local (info
, h
);
1190 elf_xtensa_allocate_plt_size (struct elf_link_hash_entry
*h
, void *arg
)
1192 asection
*srelplt
= (asection
*) arg
;
1194 if (h
->root
.type
== bfd_link_hash_warning
)
1195 h
= (struct elf_link_hash_entry
*) h
->root
.u
.i
.link
;
1197 if (h
->plt
.refcount
> 0)
1198 srelplt
->size
+= (h
->plt
.refcount
* sizeof (Elf32_External_Rela
));
1205 elf_xtensa_allocate_got_size (struct elf_link_hash_entry
*h
, void *arg
)
1207 asection
*srelgot
= (asection
*) arg
;
1209 if (h
->root
.type
== bfd_link_hash_warning
)
1210 h
= (struct elf_link_hash_entry
*) h
->root
.u
.i
.link
;
1212 if (h
->got
.refcount
> 0)
1213 srelgot
->size
+= (h
->got
.refcount
* sizeof (Elf32_External_Rela
));
1220 elf_xtensa_allocate_local_got_size (struct bfd_link_info
*info
,
1225 for (i
= info
->input_bfds
; i
; i
= i
->link_next
)
1227 bfd_signed_vma
*local_got_refcounts
;
1228 bfd_size_type j
, cnt
;
1229 Elf_Internal_Shdr
*symtab_hdr
;
1231 local_got_refcounts
= elf_local_got_refcounts (i
);
1232 if (!local_got_refcounts
)
1235 symtab_hdr
= &elf_tdata (i
)->symtab_hdr
;
1236 cnt
= symtab_hdr
->sh_info
;
1238 for (j
= 0; j
< cnt
; ++j
)
1240 if (local_got_refcounts
[j
] > 0)
1241 srelgot
->size
+= (local_got_refcounts
[j
]
1242 * sizeof (Elf32_External_Rela
));
1248 /* Set the sizes of the dynamic sections. */
1251 elf_xtensa_size_dynamic_sections (bfd
*output_bfd ATTRIBUTE_UNUSED
,
1252 struct bfd_link_info
*info
)
1255 asection
*s
, *srelplt
, *splt
, *sgotplt
, *srelgot
, *spltlittbl
, *sgotloc
;
1256 bfd_boolean relplt
, relgot
;
1257 int plt_entries
, plt_chunks
, chunk
;
1263 dynobj
= elf_hash_table (info
)->dynobj
;
1267 if (elf_hash_table (info
)->dynamic_sections_created
)
1269 /* Set the contents of the .interp section to the interpreter. */
1270 if (info
->executable
)
1272 s
= bfd_get_section_by_name (dynobj
, ".interp");
1275 s
->size
= sizeof ELF_DYNAMIC_INTERPRETER
;
1276 s
->contents
= (unsigned char *) ELF_DYNAMIC_INTERPRETER
;
1279 /* Allocate room for one word in ".got". */
1280 s
= bfd_get_section_by_name (dynobj
, ".got");
1285 /* Adjust refcounts for symbols that we now know are not "dynamic". */
1286 elf_link_hash_traverse (elf_hash_table (info
),
1287 elf_xtensa_fix_refcounts
,
1290 /* Allocate space in ".rela.got" for literals that reference
1292 srelgot
= bfd_get_section_by_name (dynobj
, ".rela.got");
1293 if (srelgot
== NULL
)
1295 elf_link_hash_traverse (elf_hash_table (info
),
1296 elf_xtensa_allocate_got_size
,
1299 /* If we are generating a shared object, we also need space in
1300 ".rela.got" for R_XTENSA_RELATIVE relocs for literals that
1301 reference local symbols. */
1303 elf_xtensa_allocate_local_got_size (info
, srelgot
);
1305 /* Allocate space in ".rela.plt" for literals that have PLT entries. */
1306 srelplt
= bfd_get_section_by_name (dynobj
, ".rela.plt");
1307 if (srelplt
== NULL
)
1309 elf_link_hash_traverse (elf_hash_table (info
),
1310 elf_xtensa_allocate_plt_size
,
1313 /* Allocate space in ".plt" to match the size of ".rela.plt". For
1314 each PLT entry, we need the PLT code plus a 4-byte literal.
1315 For each chunk of ".plt", we also need two more 4-byte
1316 literals, two corresponding entries in ".rela.got", and an
1317 8-byte entry in ".xt.lit.plt". */
1318 spltlittbl
= bfd_get_section_by_name (dynobj
, ".xt.lit.plt");
1319 if (spltlittbl
== NULL
)
1322 plt_entries
= srelplt
->size
/ sizeof (Elf32_External_Rela
);
1324 (plt_entries
+ PLT_ENTRIES_PER_CHUNK
- 1) / PLT_ENTRIES_PER_CHUNK
;
1326 /* Iterate over all the PLT chunks, including any extra sections
1327 created earlier because the initial count of PLT relocations
1328 was an overestimate. */
1330 (splt
= elf_xtensa_get_plt_section (dynobj
, chunk
)) != NULL
;
1335 sgotplt
= elf_xtensa_get_gotplt_section (dynobj
, chunk
);
1336 if (sgotplt
== NULL
)
1339 if (chunk
< plt_chunks
- 1)
1340 chunk_entries
= PLT_ENTRIES_PER_CHUNK
;
1341 else if (chunk
== plt_chunks
- 1)
1342 chunk_entries
= plt_entries
- (chunk
* PLT_ENTRIES_PER_CHUNK
);
1346 if (chunk_entries
!= 0)
1348 sgotplt
->size
= 4 * (chunk_entries
+ 2);
1349 splt
->size
= PLT_ENTRY_SIZE
* chunk_entries
;
1350 srelgot
->size
+= 2 * sizeof (Elf32_External_Rela
);
1351 spltlittbl
->size
+= 8;
1360 /* Allocate space in ".got.loc" to match the total size of all the
1362 sgotloc
= bfd_get_section_by_name (dynobj
, ".got.loc");
1363 if (sgotloc
== NULL
)
1365 sgotloc
->size
= spltlittbl
->size
;
1366 for (abfd
= info
->input_bfds
; abfd
!= NULL
; abfd
= abfd
->link_next
)
1368 if (abfd
->flags
& DYNAMIC
)
1370 for (s
= abfd
->sections
; s
!= NULL
; s
= s
->next
)
1372 if (! elf_discarded_section (s
)
1373 && xtensa_is_littable_section (s
)
1375 sgotloc
->size
+= s
->size
;
1380 /* Allocate memory for dynamic sections. */
1383 for (s
= dynobj
->sections
; s
!= NULL
; s
= s
->next
)
1387 if ((s
->flags
& SEC_LINKER_CREATED
) == 0)
1390 /* It's OK to base decisions on the section name, because none
1391 of the dynobj section names depend upon the input files. */
1392 name
= bfd_get_section_name (dynobj
, s
);
1394 if (CONST_STRNEQ (name
, ".rela"))
1398 if (strcmp (name
, ".rela.plt") == 0)
1400 else if (strcmp (name
, ".rela.got") == 0)
1403 /* We use the reloc_count field as a counter if we need
1404 to copy relocs into the output file. */
1408 else if (! CONST_STRNEQ (name
, ".plt.")
1409 && ! CONST_STRNEQ (name
, ".got.plt.")
1410 && strcmp (name
, ".got") != 0
1411 && strcmp (name
, ".plt") != 0
1412 && strcmp (name
, ".got.plt") != 0
1413 && strcmp (name
, ".xt.lit.plt") != 0
1414 && strcmp (name
, ".got.loc") != 0)
1416 /* It's not one of our sections, so don't allocate space. */
1422 /* If we don't need this section, strip it from the output
1423 file. We must create the ".plt*" and ".got.plt*"
1424 sections in create_dynamic_sections and/or check_relocs
1425 based on a conservative estimate of the PLT relocation
1426 count, because the sections must be created before the
1427 linker maps input sections to output sections. The
1428 linker does that before size_dynamic_sections, where we
1429 compute the exact size of the PLT, so there may be more
1430 of these sections than are actually needed. */
1431 s
->flags
|= SEC_EXCLUDE
;
1433 else if ((s
->flags
& SEC_HAS_CONTENTS
) != 0)
1435 /* Allocate memory for the section contents. */
1436 s
->contents
= (bfd_byte
*) bfd_zalloc (dynobj
, s
->size
);
1437 if (s
->contents
== NULL
)
1442 if (elf_hash_table (info
)->dynamic_sections_created
)
1444 /* Add the special XTENSA_RTLD relocations now. The offsets won't be
1445 known until finish_dynamic_sections, but we need to get the relocs
1446 in place before they are sorted. */
1447 if (srelgot
== NULL
)
1449 for (chunk
= 0; chunk
< plt_chunks
; chunk
++)
1451 Elf_Internal_Rela irela
;
1455 irela
.r_info
= ELF32_R_INFO (0, R_XTENSA_RTLD
);
1458 loc
= (srelgot
->contents
1459 + srelgot
->reloc_count
* sizeof (Elf32_External_Rela
));
1460 bfd_elf32_swap_reloca_out (output_bfd
, &irela
, loc
);
1461 bfd_elf32_swap_reloca_out (output_bfd
, &irela
,
1462 loc
+ sizeof (Elf32_External_Rela
));
1463 srelgot
->reloc_count
+= 2;
1466 /* Add some entries to the .dynamic section. We fill in the
1467 values later, in elf_xtensa_finish_dynamic_sections, but we
1468 must add the entries now so that we get the correct size for
1469 the .dynamic section. The DT_DEBUG entry is filled in by the
1470 dynamic linker and used by the debugger. */
1471 #define add_dynamic_entry(TAG, VAL) \
1472 _bfd_elf_add_dynamic_entry (info, TAG, VAL)
1476 if (!add_dynamic_entry (DT_DEBUG
, 0))
1482 if (!add_dynamic_entry (DT_PLTGOT
, 0)
1483 || !add_dynamic_entry (DT_PLTRELSZ
, 0)
1484 || !add_dynamic_entry (DT_PLTREL
, DT_RELA
)
1485 || !add_dynamic_entry (DT_JMPREL
, 0))
1491 if (!add_dynamic_entry (DT_RELA
, 0)
1492 || !add_dynamic_entry (DT_RELASZ
, 0)
1493 || !add_dynamic_entry (DT_RELAENT
, sizeof (Elf32_External_Rela
)))
1497 if (!add_dynamic_entry (DT_XTENSA_GOT_LOC_OFF
, 0)
1498 || !add_dynamic_entry (DT_XTENSA_GOT_LOC_SZ
, 0))
1501 #undef add_dynamic_entry
1507 /* Perform the specified relocation. The instruction at (contents + address)
1508 is modified to set one operand to represent the value in "relocation". The
1509 operand position is determined by the relocation type recorded in the
1512 #define CALL_SEGMENT_BITS (30)
1513 #define CALL_SEGMENT_SIZE (1 << CALL_SEGMENT_BITS)
1515 static bfd_reloc_status_type
1516 elf_xtensa_do_reloc (reloc_howto_type
*howto
,
1518 asection
*input_section
,
1522 bfd_boolean is_weak_undef
,
1523 char **error_message
)
1526 xtensa_opcode opcode
;
1527 xtensa_isa isa
= xtensa_default_isa
;
1528 static xtensa_insnbuf ibuff
= NULL
;
1529 static xtensa_insnbuf sbuff
= NULL
;
1530 bfd_vma self_address
= 0;
1531 bfd_size_type input_size
;
1537 ibuff
= xtensa_insnbuf_alloc (isa
);
1538 sbuff
= xtensa_insnbuf_alloc (isa
);
1541 input_size
= bfd_get_section_limit (abfd
, input_section
);
1543 switch (howto
->type
)
1546 case R_XTENSA_DIFF8
:
1547 case R_XTENSA_DIFF16
:
1548 case R_XTENSA_DIFF32
:
1549 return bfd_reloc_ok
;
1551 case R_XTENSA_ASM_EXPAND
:
1554 /* Check for windowed CALL across a 1GB boundary. */
1555 xtensa_opcode opcode
=
1556 get_expanded_call_opcode (contents
+ address
,
1557 input_size
- address
, 0);
1558 if (is_windowed_call_opcode (opcode
))
1560 self_address
= (input_section
->output_section
->vma
1561 + input_section
->output_offset
1563 if ((self_address
>> CALL_SEGMENT_BITS
)
1564 != (relocation
>> CALL_SEGMENT_BITS
))
1566 *error_message
= "windowed longcall crosses 1GB boundary; "
1568 return bfd_reloc_dangerous
;
1572 return bfd_reloc_ok
;
1574 case R_XTENSA_ASM_SIMPLIFY
:
1576 /* Convert the L32R/CALLX to CALL. */
1577 bfd_reloc_status_type retval
=
1578 elf_xtensa_do_asm_simplify (contents
, address
, input_size
,
1580 if (retval
!= bfd_reloc_ok
)
1581 return bfd_reloc_dangerous
;
1583 /* The CALL needs to be relocated. Continue below for that part. */
1585 howto
= &elf_howto_table
[(unsigned) R_XTENSA_SLOT0_OP
];
1593 x
= bfd_get_32 (abfd
, contents
+ address
);
1595 bfd_put_32 (abfd
, x
, contents
+ address
);
1597 return bfd_reloc_ok
;
1600 /* Only instruction slot-specific relocations handled below.... */
1601 slot
= get_relocation_slot (howto
->type
);
1602 if (slot
== XTENSA_UNDEFINED
)
1604 *error_message
= "unexpected relocation";
1605 return bfd_reloc_dangerous
;
1608 /* Read the instruction into a buffer and decode the opcode. */
1609 xtensa_insnbuf_from_chars (isa
, ibuff
, contents
+ address
,
1610 input_size
- address
);
1611 fmt
= xtensa_format_decode (isa
, ibuff
);
1612 if (fmt
== XTENSA_UNDEFINED
)
1614 *error_message
= "cannot decode instruction format";
1615 return bfd_reloc_dangerous
;
1618 xtensa_format_get_slot (isa
, fmt
, slot
, ibuff
, sbuff
);
1620 opcode
= xtensa_opcode_decode (isa
, fmt
, slot
, sbuff
);
1621 if (opcode
== XTENSA_UNDEFINED
)
1623 *error_message
= "cannot decode instruction opcode";
1624 return bfd_reloc_dangerous
;
1627 /* Check for opcode-specific "alternate" relocations. */
1628 if (is_alt_relocation (howto
->type
))
1630 if (opcode
== get_l32r_opcode ())
1632 /* Handle the special-case of non-PC-relative L32R instructions. */
1633 bfd
*output_bfd
= input_section
->output_section
->owner
;
1634 asection
*lit4_sec
= bfd_get_section_by_name (output_bfd
, ".lit4");
1637 *error_message
= "relocation references missing .lit4 section";
1638 return bfd_reloc_dangerous
;
1640 self_address
= ((lit4_sec
->vma
& ~0xfff)
1641 + 0x40000 - 3); /* -3 to compensate for do_reloc */
1642 newval
= relocation
;
1645 else if (opcode
== get_const16_opcode ())
1647 /* ALT used for high 16 bits. */
1648 newval
= relocation
>> 16;
1653 /* No other "alternate" relocations currently defined. */
1654 *error_message
= "unexpected relocation";
1655 return bfd_reloc_dangerous
;
1658 else /* Not an "alternate" relocation.... */
1660 if (opcode
== get_const16_opcode ())
1662 newval
= relocation
& 0xffff;
1667 /* ...normal PC-relative relocation.... */
1669 /* Determine which operand is being relocated. */
1670 opnd
= get_relocation_opnd (opcode
, howto
->type
);
1671 if (opnd
== XTENSA_UNDEFINED
)
1673 *error_message
= "unexpected relocation";
1674 return bfd_reloc_dangerous
;
1677 if (!howto
->pc_relative
)
1679 *error_message
= "expected PC-relative relocation";
1680 return bfd_reloc_dangerous
;
1683 /* Calculate the PC address for this instruction. */
1684 self_address
= (input_section
->output_section
->vma
1685 + input_section
->output_offset
1688 newval
= relocation
;
1692 /* Apply the relocation. */
1693 if (xtensa_operand_do_reloc (isa
, opcode
, opnd
, &newval
, self_address
)
1694 || xtensa_operand_encode (isa
, opcode
, opnd
, &newval
)
1695 || xtensa_operand_set_field (isa
, opcode
, opnd
, fmt
, slot
,
1698 const char *opname
= xtensa_opcode_name (isa
, opcode
);
1701 msg
= "cannot encode";
1702 if (is_direct_call_opcode (opcode
))
1704 if ((relocation
& 0x3) != 0)
1705 msg
= "misaligned call target";
1707 msg
= "call target out of range";
1709 else if (opcode
== get_l32r_opcode ())
1711 if ((relocation
& 0x3) != 0)
1712 msg
= "misaligned literal target";
1713 else if (is_alt_relocation (howto
->type
))
1714 msg
= "literal target out of range (too many literals)";
1715 else if (self_address
> relocation
)
1716 msg
= "literal target out of range (try using text-section-literals)";
1718 msg
= "literal placed after use";
1721 *error_message
= vsprint_msg (opname
, ": %s", strlen (msg
) + 2, msg
);
1722 return bfd_reloc_dangerous
;
1725 /* Check for calls across 1GB boundaries. */
1726 if (is_direct_call_opcode (opcode
)
1727 && is_windowed_call_opcode (opcode
))
1729 if ((self_address
>> CALL_SEGMENT_BITS
)
1730 != (relocation
>> CALL_SEGMENT_BITS
))
1733 "windowed call crosses 1GB boundary; return may fail";
1734 return bfd_reloc_dangerous
;
1738 /* Write the modified instruction back out of the buffer. */
1739 xtensa_format_set_slot (isa
, fmt
, slot
, ibuff
, sbuff
);
1740 xtensa_insnbuf_to_chars (isa
, ibuff
, contents
+ address
,
1741 input_size
- address
);
1742 return bfd_reloc_ok
;
1747 vsprint_msg (const char *origmsg
, const char *fmt
, int arglen
, ...)
1749 /* To reduce the size of the memory leak,
1750 we only use a single message buffer. */
1751 static bfd_size_type alloc_size
= 0;
1752 static char *message
= NULL
;
1753 bfd_size_type orig_len
, len
= 0;
1754 bfd_boolean is_append
;
1756 VA_OPEN (ap
, arglen
);
1757 VA_FIXEDARG (ap
, const char *, origmsg
);
1759 is_append
= (origmsg
== message
);
1761 orig_len
= strlen (origmsg
);
1762 len
= orig_len
+ strlen (fmt
) + arglen
+ 20;
1763 if (len
> alloc_size
)
1765 message
= (char *) bfd_realloc (message
, len
);
1769 memcpy (message
, origmsg
, orig_len
);
1770 vsprintf (message
+ orig_len
, fmt
, ap
);
1776 /* This function is registered as the "special_function" in the
1777 Xtensa howto for handling simplify operations.
1778 bfd_perform_relocation / bfd_install_relocation use it to
1779 perform (install) the specified relocation. Since this replaces the code
1780 in bfd_perform_relocation, it is basically an Xtensa-specific,
1781 stripped-down version of bfd_perform_relocation. */
1783 static bfd_reloc_status_type
1784 bfd_elf_xtensa_reloc (bfd
*abfd
,
1785 arelent
*reloc_entry
,
1788 asection
*input_section
,
1790 char **error_message
)
1793 bfd_reloc_status_type flag
;
1794 bfd_size_type octets
= reloc_entry
->address
* bfd_octets_per_byte (abfd
);
1795 bfd_vma output_base
= 0;
1796 reloc_howto_type
*howto
= reloc_entry
->howto
;
1797 asection
*reloc_target_output_section
;
1798 bfd_boolean is_weak_undef
;
1800 if (!xtensa_default_isa
)
1801 xtensa_default_isa
= xtensa_isa_init (0, 0);
1803 /* ELF relocs are against symbols. If we are producing relocatable
1804 output, and the reloc is against an external symbol, the resulting
1805 reloc will also be against the same symbol. In such a case, we
1806 don't want to change anything about the way the reloc is handled,
1807 since it will all be done at final link time. This test is similar
1808 to what bfd_elf_generic_reloc does except that it lets relocs with
1809 howto->partial_inplace go through even if the addend is non-zero.
1810 (The real problem is that partial_inplace is set for XTENSA_32
1811 relocs to begin with, but that's a long story and there's little we
1812 can do about it now....) */
1814 if (output_bfd
&& (symbol
->flags
& BSF_SECTION_SYM
) == 0)
1816 reloc_entry
->address
+= input_section
->output_offset
;
1817 return bfd_reloc_ok
;
1820 /* Is the address of the relocation really within the section? */
1821 if (reloc_entry
->address
> bfd_get_section_limit (abfd
, input_section
))
1822 return bfd_reloc_outofrange
;
1824 /* Work out which section the relocation is targeted at and the
1825 initial relocation command value. */
1827 /* Get symbol value. (Common symbols are special.) */
1828 if (bfd_is_com_section (symbol
->section
))
1831 relocation
= symbol
->value
;
1833 reloc_target_output_section
= symbol
->section
->output_section
;
1835 /* Convert input-section-relative symbol value to absolute. */
1836 if ((output_bfd
&& !howto
->partial_inplace
)
1837 || reloc_target_output_section
== NULL
)
1840 output_base
= reloc_target_output_section
->vma
;
1842 relocation
+= output_base
+ symbol
->section
->output_offset
;
1844 /* Add in supplied addend. */
1845 relocation
+= reloc_entry
->addend
;
1847 /* Here the variable relocation holds the final address of the
1848 symbol we are relocating against, plus any addend. */
1851 if (!howto
->partial_inplace
)
1853 /* This is a partial relocation, and we want to apply the relocation
1854 to the reloc entry rather than the raw data. Everything except
1855 relocations against section symbols has already been handled
1858 BFD_ASSERT (symbol
->flags
& BSF_SECTION_SYM
);
1859 reloc_entry
->addend
= relocation
;
1860 reloc_entry
->address
+= input_section
->output_offset
;
1861 return bfd_reloc_ok
;
1865 reloc_entry
->address
+= input_section
->output_offset
;
1866 reloc_entry
->addend
= 0;
1870 is_weak_undef
= (bfd_is_und_section (symbol
->section
)
1871 && (symbol
->flags
& BSF_WEAK
) != 0);
1872 flag
= elf_xtensa_do_reloc (howto
, abfd
, input_section
, relocation
,
1873 (bfd_byte
*) data
, (bfd_vma
) octets
,
1874 is_weak_undef
, error_message
);
1876 if (flag
== bfd_reloc_dangerous
)
1878 /* Add the symbol name to the error message. */
1879 if (! *error_message
)
1880 *error_message
= "";
1881 *error_message
= vsprint_msg (*error_message
, ": (%s + 0x%lx)",
1882 strlen (symbol
->name
) + 17,
1884 (unsigned long) reloc_entry
->addend
);
1891 /* Set up an entry in the procedure linkage table. */
1894 elf_xtensa_create_plt_entry (bfd
*dynobj
,
1896 unsigned reloc_index
)
1898 asection
*splt
, *sgotplt
;
1899 bfd_vma plt_base
, got_base
;
1900 bfd_vma code_offset
, lit_offset
;
1903 chunk
= reloc_index
/ PLT_ENTRIES_PER_CHUNK
;
1904 splt
= elf_xtensa_get_plt_section (dynobj
, chunk
);
1905 sgotplt
= elf_xtensa_get_gotplt_section (dynobj
, chunk
);
1906 BFD_ASSERT (splt
!= NULL
&& sgotplt
!= NULL
);
1908 plt_base
= splt
->output_section
->vma
+ splt
->output_offset
;
1909 got_base
= sgotplt
->output_section
->vma
+ sgotplt
->output_offset
;
1911 lit_offset
= 8 + (reloc_index
% PLT_ENTRIES_PER_CHUNK
) * 4;
1912 code_offset
= (reloc_index
% PLT_ENTRIES_PER_CHUNK
) * PLT_ENTRY_SIZE
;
1914 /* Fill in the literal entry. This is the offset of the dynamic
1915 relocation entry. */
1916 bfd_put_32 (output_bfd
, reloc_index
* sizeof (Elf32_External_Rela
),
1917 sgotplt
->contents
+ lit_offset
);
1919 /* Fill in the entry in the procedure linkage table. */
1920 memcpy (splt
->contents
+ code_offset
,
1921 (bfd_big_endian (output_bfd
)
1922 ? elf_xtensa_be_plt_entry
1923 : elf_xtensa_le_plt_entry
),
1925 bfd_put_16 (output_bfd
, l32r_offset (got_base
+ 0,
1926 plt_base
+ code_offset
+ 3),
1927 splt
->contents
+ code_offset
+ 4);
1928 bfd_put_16 (output_bfd
, l32r_offset (got_base
+ 4,
1929 plt_base
+ code_offset
+ 6),
1930 splt
->contents
+ code_offset
+ 7);
1931 bfd_put_16 (output_bfd
, l32r_offset (got_base
+ lit_offset
,
1932 plt_base
+ code_offset
+ 9),
1933 splt
->contents
+ code_offset
+ 10);
1935 return plt_base
+ code_offset
;
1939 /* Relocate an Xtensa ELF section. This is invoked by the linker for
1940 both relocatable and final links. */
1943 elf_xtensa_relocate_section (bfd
*output_bfd
,
1944 struct bfd_link_info
*info
,
1946 asection
*input_section
,
1948 Elf_Internal_Rela
*relocs
,
1949 Elf_Internal_Sym
*local_syms
,
1950 asection
**local_sections
)
1952 Elf_Internal_Shdr
*symtab_hdr
;
1953 Elf_Internal_Rela
*rel
;
1954 Elf_Internal_Rela
*relend
;
1955 struct elf_link_hash_entry
**sym_hashes
;
1956 asection
*srelgot
, *srelplt
;
1958 property_table_entry
*lit_table
= 0;
1960 char *error_message
= NULL
;
1961 bfd_size_type input_size
;
1963 if (!xtensa_default_isa
)
1964 xtensa_default_isa
= xtensa_isa_init (0, 0);
1966 dynobj
= elf_hash_table (info
)->dynobj
;
1967 symtab_hdr
= &elf_tdata (input_bfd
)->symtab_hdr
;
1968 sym_hashes
= elf_sym_hashes (input_bfd
);
1974 srelgot
= bfd_get_section_by_name (dynobj
, ".rela.got");;
1975 srelplt
= bfd_get_section_by_name (dynobj
, ".rela.plt");
1978 if (elf_hash_table (info
)->dynamic_sections_created
)
1980 ltblsize
= xtensa_read_table_entries (input_bfd
, input_section
,
1981 &lit_table
, XTENSA_LIT_SEC_NAME
,
1987 input_size
= bfd_get_section_limit (input_bfd
, input_section
);
1990 relend
= relocs
+ input_section
->reloc_count
;
1991 for (; rel
< relend
; rel
++)
1994 reloc_howto_type
*howto
;
1995 unsigned long r_symndx
;
1996 struct elf_link_hash_entry
*h
;
1997 Elf_Internal_Sym
*sym
;
2000 bfd_reloc_status_type r
;
2001 bfd_boolean is_weak_undef
;
2002 bfd_boolean unresolved_reloc
;
2005 r_type
= ELF32_R_TYPE (rel
->r_info
);
2006 if (r_type
== (int) R_XTENSA_GNU_VTINHERIT
2007 || r_type
== (int) R_XTENSA_GNU_VTENTRY
)
2010 if (r_type
< 0 || r_type
>= (int) R_XTENSA_max
)
2012 bfd_set_error (bfd_error_bad_value
);
2015 howto
= &elf_howto_table
[r_type
];
2017 r_symndx
= ELF32_R_SYM (rel
->r_info
);
2019 if (info
->relocatable
)
2021 /* This is a relocatable link.
2022 1) If the reloc is against a section symbol, adjust
2023 according to the output section.
2024 2) If there is a new target for this relocation,
2025 the new target will be in the same output section.
2026 We adjust the relocation by the output section
2029 if (relaxing_section
)
2031 /* Check if this references a section in another input file. */
2032 if (!do_fix_for_relocatable_link (rel
, input_bfd
, input_section
,
2035 r_type
= ELF32_R_TYPE (rel
->r_info
);
2038 if (r_type
== R_XTENSA_ASM_SIMPLIFY
)
2040 char *error_message
= NULL
;
2041 /* Convert ASM_SIMPLIFY into the simpler relocation
2042 so that they never escape a relaxing link. */
2043 r
= contract_asm_expansion (contents
, input_size
, rel
,
2045 if (r
!= bfd_reloc_ok
)
2047 if (!((*info
->callbacks
->reloc_dangerous
)
2048 (info
, error_message
, input_bfd
, input_section
,
2052 r_type
= ELF32_R_TYPE (rel
->r_info
);
2055 /* This is a relocatable link, so we don't have to change
2056 anything unless the reloc is against a section symbol,
2057 in which case we have to adjust according to where the
2058 section symbol winds up in the output section. */
2059 if (r_symndx
< symtab_hdr
->sh_info
)
2061 sym
= local_syms
+ r_symndx
;
2062 if (ELF_ST_TYPE (sym
->st_info
) == STT_SECTION
)
2064 sec
= local_sections
[r_symndx
];
2065 rel
->r_addend
+= sec
->output_offset
+ sym
->st_value
;
2069 /* If there is an addend with a partial_inplace howto,
2070 then move the addend to the contents. This is a hack
2071 to work around problems with DWARF in relocatable links
2072 with some previous version of BFD. Now we can't easily get
2073 rid of the hack without breaking backward compatibility.... */
2076 howto
= &elf_howto_table
[r_type
];
2077 if (howto
->partial_inplace
)
2079 r
= elf_xtensa_do_reloc (howto
, input_bfd
, input_section
,
2080 rel
->r_addend
, contents
,
2081 rel
->r_offset
, FALSE
,
2083 if (r
!= bfd_reloc_ok
)
2085 if (!((*info
->callbacks
->reloc_dangerous
)
2086 (info
, error_message
, input_bfd
, input_section
,
2094 /* Done with work for relocatable link; continue with next reloc. */
2098 /* This is a final link. */
2103 is_weak_undef
= FALSE
;
2104 unresolved_reloc
= FALSE
;
2107 if (howto
->partial_inplace
)
2109 /* Because R_XTENSA_32 was made partial_inplace to fix some
2110 problems with DWARF info in partial links, there may be
2111 an addend stored in the contents. Take it out of there
2112 and move it back into the addend field of the reloc. */
2113 rel
->r_addend
+= bfd_get_32 (input_bfd
, contents
+ rel
->r_offset
);
2114 bfd_put_32 (input_bfd
, 0, contents
+ rel
->r_offset
);
2117 if (r_symndx
< symtab_hdr
->sh_info
)
2119 sym
= local_syms
+ r_symndx
;
2120 sec
= local_sections
[r_symndx
];
2121 relocation
= _bfd_elf_rela_local_sym (output_bfd
, sym
, &sec
, rel
);
2125 RELOC_FOR_GLOBAL_SYMBOL (info
, input_bfd
, input_section
, rel
,
2126 r_symndx
, symtab_hdr
, sym_hashes
,
2128 unresolved_reloc
, warned
);
2131 && !unresolved_reloc
2132 && h
->root
.type
== bfd_link_hash_undefweak
)
2133 is_weak_undef
= TRUE
;
2136 if (relaxing_section
)
2138 /* Check if this references a section in another input file. */
2139 do_fix_for_final_link (rel
, input_bfd
, input_section
, contents
,
2142 /* Update some already cached values. */
2143 r_type
= ELF32_R_TYPE (rel
->r_info
);
2144 howto
= &elf_howto_table
[r_type
];
2147 /* Sanity check the address. */
2148 if (rel
->r_offset
>= input_size
2149 && ELF32_R_TYPE (rel
->r_info
) != R_XTENSA_NONE
)
2151 (*_bfd_error_handler
)
2152 (_("%B(%A+0x%lx): relocation offset out of range (size=0x%x)"),
2153 input_bfd
, input_section
, rel
->r_offset
, input_size
);
2154 bfd_set_error (bfd_error_bad_value
);
2158 /* Generate dynamic relocations. */
2159 if (elf_hash_table (info
)->dynamic_sections_created
)
2161 bfd_boolean dynamic_symbol
= xtensa_elf_dynamic_symbol_p (h
, info
);
2163 if (dynamic_symbol
&& is_operand_relocation (r_type
))
2165 /* This is an error. The symbol's real value won't be known
2166 until runtime and it's likely to be out of range anyway. */
2167 const char *name
= h
->root
.root
.string
;
2168 error_message
= vsprint_msg ("invalid relocation for dynamic "
2170 strlen (name
) + 2, name
);
2171 if (!((*info
->callbacks
->reloc_dangerous
)
2172 (info
, error_message
, input_bfd
, input_section
,
2176 else if ((r_type
== R_XTENSA_32
|| r_type
== R_XTENSA_PLT
)
2177 && (input_section
->flags
& SEC_ALLOC
) != 0
2178 && (dynamic_symbol
|| info
->shared
))
2180 Elf_Internal_Rela outrel
;
2184 if (dynamic_symbol
&& r_type
== R_XTENSA_PLT
)
2189 BFD_ASSERT (srel
!= NULL
);
2192 _bfd_elf_section_offset (output_bfd
, info
,
2193 input_section
, rel
->r_offset
);
2195 if ((outrel
.r_offset
| 1) == (bfd_vma
) -1)
2196 memset (&outrel
, 0, sizeof outrel
);
2199 outrel
.r_offset
+= (input_section
->output_section
->vma
2200 + input_section
->output_offset
);
2202 /* Complain if the relocation is in a read-only section
2203 and not in a literal pool. */
2204 if ((input_section
->flags
& SEC_READONLY
) != 0
2205 && !elf_xtensa_in_literal_pool (lit_table
, ltblsize
,
2209 _("dynamic relocation in read-only section");
2210 if (!((*info
->callbacks
->reloc_dangerous
)
2211 (info
, error_message
, input_bfd
, input_section
,
2218 outrel
.r_addend
= rel
->r_addend
;
2221 if (r_type
== R_XTENSA_32
)
2224 ELF32_R_INFO (h
->dynindx
, R_XTENSA_GLOB_DAT
);
2227 else /* r_type == R_XTENSA_PLT */
2230 ELF32_R_INFO (h
->dynindx
, R_XTENSA_JMP_SLOT
);
2232 /* Create the PLT entry and set the initial
2233 contents of the literal entry to the address of
2236 elf_xtensa_create_plt_entry (dynobj
, output_bfd
,
2239 unresolved_reloc
= FALSE
;
2243 /* Generate a RELATIVE relocation. */
2244 outrel
.r_info
= ELF32_R_INFO (0, R_XTENSA_RELATIVE
);
2245 outrel
.r_addend
= 0;
2249 loc
= (srel
->contents
2250 + srel
->reloc_count
++ * sizeof (Elf32_External_Rela
));
2251 bfd_elf32_swap_reloca_out (output_bfd
, &outrel
, loc
);
2252 BFD_ASSERT (sizeof (Elf32_External_Rela
) * srel
->reloc_count
2257 /* Dynamic relocs are not propagated for SEC_DEBUGGING sections
2258 because such sections are not SEC_ALLOC and thus ld.so will
2259 not process them. */
2260 if (unresolved_reloc
2261 && !((input_section
->flags
& SEC_DEBUGGING
) != 0
2263 (*_bfd_error_handler
)
2264 (_("%B(%A+0x%lx): unresolvable %s relocation against symbol `%s'"),
2267 (long) rel
->r_offset
,
2269 h
->root
.root
.string
);
2271 /* There's no point in calling bfd_perform_relocation here.
2272 Just go directly to our "special function". */
2273 r
= elf_xtensa_do_reloc (howto
, input_bfd
, input_section
,
2274 relocation
+ rel
->r_addend
,
2275 contents
, rel
->r_offset
, is_weak_undef
,
2278 if (r
!= bfd_reloc_ok
&& !warned
)
2282 BFD_ASSERT (r
== bfd_reloc_dangerous
|| r
== bfd_reloc_other
);
2283 BFD_ASSERT (error_message
!= NULL
);
2286 name
= h
->root
.root
.string
;
2289 name
= bfd_elf_string_from_elf_section
2290 (input_bfd
, symtab_hdr
->sh_link
, sym
->st_name
);
2291 if (name
&& *name
== '\0')
2292 name
= bfd_section_name (input_bfd
, sec
);
2296 if (rel
->r_addend
== 0)
2297 error_message
= vsprint_msg (error_message
, ": %s",
2298 strlen (name
) + 2, name
);
2300 error_message
= vsprint_msg (error_message
, ": (%s+0x%x)",
2302 name
, (int)rel
->r_addend
);
2305 if (!((*info
->callbacks
->reloc_dangerous
)
2306 (info
, error_message
, input_bfd
, input_section
,
2315 input_section
->reloc_done
= TRUE
;
2321 /* Finish up dynamic symbol handling. There's not much to do here since
2322 the PLT and GOT entries are all set up by relocate_section. */
2325 elf_xtensa_finish_dynamic_symbol (bfd
*output_bfd ATTRIBUTE_UNUSED
,
2326 struct bfd_link_info
*info ATTRIBUTE_UNUSED
,
2327 struct elf_link_hash_entry
*h
,
2328 Elf_Internal_Sym
*sym
)
2333 /* Mark the symbol as undefined, rather than as defined in
2334 the .plt section. Leave the value alone. */
2335 sym
->st_shndx
= SHN_UNDEF
;
2338 /* Mark _DYNAMIC and _GLOBAL_OFFSET_TABLE_ as absolute. */
2339 if (strcmp (h
->root
.root
.string
, "_DYNAMIC") == 0
2340 || h
== elf_hash_table (info
)->hgot
)
2341 sym
->st_shndx
= SHN_ABS
;
2347 /* Combine adjacent literal table entries in the output. Adjacent
2348 entries within each input section may have been removed during
2349 relaxation, but we repeat the process here, even though it's too late
2350 to shrink the output section, because it's important to minimize the
2351 number of literal table entries to reduce the start-up work for the
2352 runtime linker. Returns the number of remaining table entries or -1
2356 elf_xtensa_combine_prop_entries (bfd
*output_bfd
,
2361 property_table_entry
*table
;
2362 bfd_size_type section_size
, sgotloc_size
;
2366 section_size
= sxtlit
->size
;
2367 BFD_ASSERT (section_size
% 8 == 0);
2368 num
= section_size
/ 8;
2370 sgotloc_size
= sgotloc
->size
;
2371 if (sgotloc_size
!= section_size
)
2373 (*_bfd_error_handler
)
2374 (_("internal inconsistency in size of .got.loc section"));
2378 table
= bfd_malloc (num
* sizeof (property_table_entry
));
2382 /* The ".xt.lit.plt" section has the SEC_IN_MEMORY flag set and this
2383 propagates to the output section, where it doesn't really apply and
2384 where it breaks the following call to bfd_malloc_and_get_section. */
2385 sxtlit
->flags
&= ~SEC_IN_MEMORY
;
2387 if (!bfd_malloc_and_get_section (output_bfd
, sxtlit
, &contents
))
2395 /* There should never be any relocations left at this point, so this
2396 is quite a bit easier than what is done during relaxation. */
2398 /* Copy the raw contents into a property table array and sort it. */
2400 for (n
= 0; n
< num
; n
++)
2402 table
[n
].address
= bfd_get_32 (output_bfd
, &contents
[offset
]);
2403 table
[n
].size
= bfd_get_32 (output_bfd
, &contents
[offset
+ 4]);
2406 qsort (table
, num
, sizeof (property_table_entry
), property_table_compare
);
2408 for (n
= 0; n
< num
; n
++)
2410 bfd_boolean remove
= FALSE
;
2412 if (table
[n
].size
== 0)
2415 (table
[n
-1].address
+ table
[n
-1].size
== table
[n
].address
))
2417 table
[n
-1].size
+= table
[n
].size
;
2423 for (m
= n
; m
< num
- 1; m
++)
2425 table
[m
].address
= table
[m
+1].address
;
2426 table
[m
].size
= table
[m
+1].size
;
2434 /* Copy the data back to the raw contents. */
2436 for (n
= 0; n
< num
; n
++)
2438 bfd_put_32 (output_bfd
, table
[n
].address
, &contents
[offset
]);
2439 bfd_put_32 (output_bfd
, table
[n
].size
, &contents
[offset
+ 4]);
2443 /* Clear the removed bytes. */
2444 if ((bfd_size_type
) (num
* 8) < section_size
)
2445 memset (&contents
[num
* 8], 0, section_size
- num
* 8);
2447 if (! bfd_set_section_contents (output_bfd
, sxtlit
, contents
, 0,
2451 /* Copy the contents to ".got.loc". */
2452 memcpy (sgotloc
->contents
, contents
, section_size
);
2460 /* Finish up the dynamic sections. */
2463 elf_xtensa_finish_dynamic_sections (bfd
*output_bfd
,
2464 struct bfd_link_info
*info
)
2467 asection
*sdyn
, *srelplt
, *sgot
, *sxtlit
, *sgotloc
;
2468 Elf32_External_Dyn
*dyncon
, *dynconend
;
2469 int num_xtlit_entries
;
2471 if (! elf_hash_table (info
)->dynamic_sections_created
)
2474 dynobj
= elf_hash_table (info
)->dynobj
;
2475 sdyn
= bfd_get_section_by_name (dynobj
, ".dynamic");
2476 BFD_ASSERT (sdyn
!= NULL
);
2478 /* Set the first entry in the global offset table to the address of
2479 the dynamic section. */
2480 sgot
= bfd_get_section_by_name (dynobj
, ".got");
2483 BFD_ASSERT (sgot
->size
== 4);
2485 bfd_put_32 (output_bfd
, 0, sgot
->contents
);
2487 bfd_put_32 (output_bfd
,
2488 sdyn
->output_section
->vma
+ sdyn
->output_offset
,
2492 srelplt
= bfd_get_section_by_name (dynobj
, ".rela.plt");
2493 if (srelplt
&& srelplt
->size
!= 0)
2495 asection
*sgotplt
, *srelgot
, *spltlittbl
;
2496 int chunk
, plt_chunks
, plt_entries
;
2497 Elf_Internal_Rela irela
;
2499 unsigned rtld_reloc
;
2501 srelgot
= bfd_get_section_by_name (dynobj
, ".rela.got");;
2502 BFD_ASSERT (srelgot
!= NULL
);
2504 spltlittbl
= bfd_get_section_by_name (dynobj
, ".xt.lit.plt");
2505 BFD_ASSERT (spltlittbl
!= NULL
);
2507 /* Find the first XTENSA_RTLD relocation. Presumably the rest
2508 of them follow immediately after.... */
2509 for (rtld_reloc
= 0; rtld_reloc
< srelgot
->reloc_count
; rtld_reloc
++)
2511 loc
= srelgot
->contents
+ rtld_reloc
* sizeof (Elf32_External_Rela
);
2512 bfd_elf32_swap_reloca_in (output_bfd
, loc
, &irela
);
2513 if (ELF32_R_TYPE (irela
.r_info
) == R_XTENSA_RTLD
)
2516 BFD_ASSERT (rtld_reloc
< srelgot
->reloc_count
);
2518 plt_entries
= srelplt
->size
/ sizeof (Elf32_External_Rela
);
2520 (plt_entries
+ PLT_ENTRIES_PER_CHUNK
- 1) / PLT_ENTRIES_PER_CHUNK
;
2522 for (chunk
= 0; chunk
< plt_chunks
; chunk
++)
2524 int chunk_entries
= 0;
2526 sgotplt
= elf_xtensa_get_gotplt_section (dynobj
, chunk
);
2527 BFD_ASSERT (sgotplt
!= NULL
);
2529 /* Emit special RTLD relocations for the first two entries in
2530 each chunk of the .got.plt section. */
2532 loc
= srelgot
->contents
+ rtld_reloc
* 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
);
2537 irela
.r_addend
= 1; /* tell rtld to set value to resolver function */
2538 bfd_elf32_swap_reloca_out (output_bfd
, &irela
, loc
);
2540 BFD_ASSERT (rtld_reloc
<= srelgot
->reloc_count
);
2542 /* Next literal immediately follows the first. */
2543 loc
+= sizeof (Elf32_External_Rela
);
2544 bfd_elf32_swap_reloca_in (output_bfd
, loc
, &irela
);
2545 BFD_ASSERT (ELF32_R_TYPE (irela
.r_info
) == R_XTENSA_RTLD
);
2546 irela
.r_offset
= (sgotplt
->output_section
->vma
2547 + sgotplt
->output_offset
+ 4);
2548 /* Tell rtld to set value to object's link map. */
2550 bfd_elf32_swap_reloca_out (output_bfd
, &irela
, loc
);
2552 BFD_ASSERT (rtld_reloc
<= srelgot
->reloc_count
);
2554 /* Fill in the literal table. */
2555 if (chunk
< plt_chunks
- 1)
2556 chunk_entries
= PLT_ENTRIES_PER_CHUNK
;
2558 chunk_entries
= plt_entries
- (chunk
* PLT_ENTRIES_PER_CHUNK
);
2560 BFD_ASSERT ((unsigned) (chunk
+ 1) * 8 <= spltlittbl
->size
);
2561 bfd_put_32 (output_bfd
,
2562 sgotplt
->output_section
->vma
+ sgotplt
->output_offset
,
2563 spltlittbl
->contents
+ (chunk
* 8) + 0);
2564 bfd_put_32 (output_bfd
,
2565 8 + (chunk_entries
* 4),
2566 spltlittbl
->contents
+ (chunk
* 8) + 4);
2569 /* All the dynamic relocations have been emitted at this point.
2570 Make sure the relocation sections are the correct size. */
2571 if (srelgot
->size
!= (sizeof (Elf32_External_Rela
)
2572 * srelgot
->reloc_count
)
2573 || srelplt
->size
!= (sizeof (Elf32_External_Rela
)
2574 * srelplt
->reloc_count
))
2577 /* The .xt.lit.plt section has just been modified. This must
2578 happen before the code below which combines adjacent literal
2579 table entries, and the .xt.lit.plt contents have to be forced to
2581 if (! bfd_set_section_contents (output_bfd
,
2582 spltlittbl
->output_section
,
2583 spltlittbl
->contents
,
2584 spltlittbl
->output_offset
,
2587 /* Clear SEC_HAS_CONTENTS so the contents won't be output again. */
2588 spltlittbl
->flags
&= ~SEC_HAS_CONTENTS
;
2591 /* Combine adjacent literal table entries. */
2592 BFD_ASSERT (! info
->relocatable
);
2593 sxtlit
= bfd_get_section_by_name (output_bfd
, ".xt.lit");
2594 sgotloc
= bfd_get_section_by_name (dynobj
, ".got.loc");
2595 BFD_ASSERT (sxtlit
&& sgotloc
);
2597 elf_xtensa_combine_prop_entries (output_bfd
, sxtlit
, sgotloc
);
2598 if (num_xtlit_entries
< 0)
2601 dyncon
= (Elf32_External_Dyn
*) sdyn
->contents
;
2602 dynconend
= (Elf32_External_Dyn
*) (sdyn
->contents
+ sdyn
->size
);
2603 for (; dyncon
< dynconend
; dyncon
++)
2605 Elf_Internal_Dyn dyn
;
2609 bfd_elf32_swap_dyn_in (dynobj
, dyncon
, &dyn
);
2616 case DT_XTENSA_GOT_LOC_SZ
:
2617 dyn
.d_un
.d_val
= num_xtlit_entries
;
2620 case DT_XTENSA_GOT_LOC_OFF
:
2629 s
= bfd_get_section_by_name (output_bfd
, name
);
2631 dyn
.d_un
.d_ptr
= s
->vma
;
2635 s
= bfd_get_section_by_name (output_bfd
, ".rela.plt");
2637 dyn
.d_un
.d_val
= s
->size
;
2641 /* Adjust RELASZ to not include JMPREL. This matches what
2642 glibc expects and what is done for several other ELF
2643 targets (e.g., i386, alpha), but the "correct" behavior
2644 seems to be unresolved. Since the linker script arranges
2645 for .rela.plt to follow all other relocation sections, we
2646 don't have to worry about changing the DT_RELA entry. */
2647 s
= bfd_get_section_by_name (output_bfd
, ".rela.plt");
2649 dyn
.d_un
.d_val
-= s
->size
;
2653 bfd_elf32_swap_dyn_out (output_bfd
, &dyn
, dyncon
);
2660 /* Functions for dealing with the e_flags field. */
2662 /* Merge backend specific data from an object file to the output
2663 object file when linking. */
2666 elf_xtensa_merge_private_bfd_data (bfd
*ibfd
, bfd
*obfd
)
2668 unsigned out_mach
, in_mach
;
2669 flagword out_flag
, in_flag
;
2671 /* Check if we have the same endianess. */
2672 if (!_bfd_generic_verify_endian_match (ibfd
, obfd
))
2675 /* Don't even pretend to support mixed-format linking. */
2676 if (bfd_get_flavour (ibfd
) != bfd_target_elf_flavour
2677 || bfd_get_flavour (obfd
) != bfd_target_elf_flavour
)
2680 out_flag
= elf_elfheader (obfd
)->e_flags
;
2681 in_flag
= elf_elfheader (ibfd
)->e_flags
;
2683 out_mach
= out_flag
& EF_XTENSA_MACH
;
2684 in_mach
= in_flag
& EF_XTENSA_MACH
;
2685 if (out_mach
!= in_mach
)
2687 (*_bfd_error_handler
)
2688 (_("%B: incompatible machine type. Output is 0x%x. Input is 0x%x"),
2689 ibfd
, out_mach
, in_mach
);
2690 bfd_set_error (bfd_error_wrong_format
);
2694 if (! elf_flags_init (obfd
))
2696 elf_flags_init (obfd
) = TRUE
;
2697 elf_elfheader (obfd
)->e_flags
= in_flag
;
2699 if (bfd_get_arch (obfd
) == bfd_get_arch (ibfd
)
2700 && bfd_get_arch_info (obfd
)->the_default
)
2701 return bfd_set_arch_mach (obfd
, bfd_get_arch (ibfd
),
2702 bfd_get_mach (ibfd
));
2707 if ((out_flag
& EF_XTENSA_XT_INSN
) != (in_flag
& EF_XTENSA_XT_INSN
))
2708 elf_elfheader (obfd
)->e_flags
&= (~ EF_XTENSA_XT_INSN
);
2710 if ((out_flag
& EF_XTENSA_XT_LIT
) != (in_flag
& EF_XTENSA_XT_LIT
))
2711 elf_elfheader (obfd
)->e_flags
&= (~ EF_XTENSA_XT_LIT
);
2718 elf_xtensa_set_private_flags (bfd
*abfd
, flagword flags
)
2720 BFD_ASSERT (!elf_flags_init (abfd
)
2721 || elf_elfheader (abfd
)->e_flags
== flags
);
2723 elf_elfheader (abfd
)->e_flags
|= flags
;
2724 elf_flags_init (abfd
) = TRUE
;
2731 elf_xtensa_print_private_bfd_data (bfd
*abfd
, void *farg
)
2733 FILE *f
= (FILE *) farg
;
2734 flagword e_flags
= elf_elfheader (abfd
)->e_flags
;
2736 fprintf (f
, "\nXtensa header:\n");
2737 if ((e_flags
& EF_XTENSA_MACH
) == E_XTENSA_MACH
)
2738 fprintf (f
, "\nMachine = Base\n");
2740 fprintf (f
, "\nMachine Id = 0x%x\n", e_flags
& EF_XTENSA_MACH
);
2742 fprintf (f
, "Insn tables = %s\n",
2743 (e_flags
& EF_XTENSA_XT_INSN
) ? "true" : "false");
2745 fprintf (f
, "Literal tables = %s\n",
2746 (e_flags
& EF_XTENSA_XT_LIT
) ? "true" : "false");
2748 return _bfd_elf_print_private_bfd_data (abfd
, farg
);
2752 /* Set the right machine number for an Xtensa ELF file. */
2755 elf_xtensa_object_p (bfd
*abfd
)
2758 unsigned long arch
= elf_elfheader (abfd
)->e_flags
& EF_XTENSA_MACH
;
2763 mach
= bfd_mach_xtensa
;
2769 (void) bfd_default_set_arch_mach (abfd
, bfd_arch_xtensa
, mach
);
2774 /* The final processing done just before writing out an Xtensa ELF object
2775 file. This gets the Xtensa architecture right based on the machine
2779 elf_xtensa_final_write_processing (bfd
*abfd
,
2780 bfd_boolean linker ATTRIBUTE_UNUSED
)
2785 switch (mach
= bfd_get_mach (abfd
))
2787 case bfd_mach_xtensa
:
2788 val
= E_XTENSA_MACH
;
2794 elf_elfheader (abfd
)->e_flags
&= (~ EF_XTENSA_MACH
);
2795 elf_elfheader (abfd
)->e_flags
|= val
;
2799 static enum elf_reloc_type_class
2800 elf_xtensa_reloc_type_class (const Elf_Internal_Rela
*rela
)
2802 switch ((int) ELF32_R_TYPE (rela
->r_info
))
2804 case R_XTENSA_RELATIVE
:
2805 return reloc_class_relative
;
2806 case R_XTENSA_JMP_SLOT
:
2807 return reloc_class_plt
;
2809 return reloc_class_normal
;
2815 elf_xtensa_discard_info_for_section (bfd
*abfd
,
2816 struct elf_reloc_cookie
*cookie
,
2817 struct bfd_link_info
*info
,
2821 bfd_vma section_size
;
2822 bfd_vma offset
, actual_offset
;
2823 size_t removed_bytes
= 0;
2825 section_size
= sec
->size
;
2826 if (section_size
== 0 || section_size
% 8 != 0)
2829 if (sec
->output_section
2830 && bfd_is_abs_section (sec
->output_section
))
2833 contents
= retrieve_contents (abfd
, sec
, info
->keep_memory
);
2837 cookie
->rels
= retrieve_internal_relocs (abfd
, sec
, info
->keep_memory
);
2840 release_contents (sec
, contents
);
2844 cookie
->rel
= cookie
->rels
;
2845 cookie
->relend
= cookie
->rels
+ sec
->reloc_count
;
2847 for (offset
= 0; offset
< section_size
; offset
+= 8)
2849 actual_offset
= offset
- removed_bytes
;
2851 /* The ...symbol_deleted_p function will skip over relocs but it
2852 won't adjust their offsets, so do that here. */
2853 while (cookie
->rel
< cookie
->relend
2854 && cookie
->rel
->r_offset
< offset
)
2856 cookie
->rel
->r_offset
-= removed_bytes
;
2860 while (cookie
->rel
< cookie
->relend
2861 && cookie
->rel
->r_offset
== offset
)
2863 if (bfd_elf_reloc_symbol_deleted_p (offset
, cookie
))
2865 /* Remove the table entry. (If the reloc type is NONE, then
2866 the entry has already been merged with another and deleted
2867 during relaxation.) */
2868 if (ELF32_R_TYPE (cookie
->rel
->r_info
) != R_XTENSA_NONE
)
2870 /* Shift the contents up. */
2871 if (offset
+ 8 < section_size
)
2872 memmove (&contents
[actual_offset
],
2873 &contents
[actual_offset
+8],
2874 section_size
- offset
- 8);
2878 /* Remove this relocation. */
2879 cookie
->rel
->r_info
= ELF32_R_INFO (0, R_XTENSA_NONE
);
2882 /* Adjust the relocation offset for previous removals. This
2883 should not be done before calling ...symbol_deleted_p
2884 because it might mess up the offset comparisons there.
2885 Make sure the offset doesn't underflow in the case where
2886 the first entry is removed. */
2887 if (cookie
->rel
->r_offset
>= removed_bytes
)
2888 cookie
->rel
->r_offset
-= removed_bytes
;
2890 cookie
->rel
->r_offset
= 0;
2896 if (removed_bytes
!= 0)
2898 /* Adjust any remaining relocs (shouldn't be any). */
2899 for (; cookie
->rel
< cookie
->relend
; cookie
->rel
++)
2901 if (cookie
->rel
->r_offset
>= removed_bytes
)
2902 cookie
->rel
->r_offset
-= removed_bytes
;
2904 cookie
->rel
->r_offset
= 0;
2907 /* Clear the removed bytes. */
2908 memset (&contents
[section_size
- removed_bytes
], 0, removed_bytes
);
2910 pin_contents (sec
, contents
);
2911 pin_internal_relocs (sec
, cookie
->rels
);
2914 sec
->size
= section_size
- removed_bytes
;
2916 if (xtensa_is_littable_section (sec
))
2918 bfd
*dynobj
= elf_hash_table (info
)->dynobj
;
2922 bfd_get_section_by_name (dynobj
, ".got.loc");
2924 sgotloc
->size
-= removed_bytes
;
2930 release_contents (sec
, contents
);
2931 release_internal_relocs (sec
, cookie
->rels
);
2934 return (removed_bytes
!= 0);
2939 elf_xtensa_discard_info (bfd
*abfd
,
2940 struct elf_reloc_cookie
*cookie
,
2941 struct bfd_link_info
*info
)
2944 bfd_boolean changed
= FALSE
;
2946 for (sec
= abfd
->sections
; sec
!= NULL
; sec
= sec
->next
)
2948 if (xtensa_is_property_section (sec
))
2950 if (elf_xtensa_discard_info_for_section (abfd
, cookie
, info
, sec
))
2960 elf_xtensa_ignore_discarded_relocs (asection
*sec
)
2962 return xtensa_is_property_section (sec
);
2966 /* Support for core dump NOTE sections. */
2969 elf_xtensa_grok_prstatus (bfd
*abfd
, Elf_Internal_Note
*note
)
2974 /* The size for Xtensa is variable, so don't try to recognize the format
2975 based on the size. Just assume this is GNU/Linux. */
2978 elf_tdata (abfd
)->core_signal
= bfd_get_16 (abfd
, note
->descdata
+ 12);
2981 elf_tdata (abfd
)->core_pid
= bfd_get_32 (abfd
, note
->descdata
+ 24);
2985 size
= note
->descsz
- offset
- 4;
2987 /* Make a ".reg/999" section. */
2988 return _bfd_elfcore_make_pseudosection (abfd
, ".reg",
2989 size
, note
->descpos
+ offset
);
2994 elf_xtensa_grok_psinfo (bfd
*abfd
, Elf_Internal_Note
*note
)
2996 switch (note
->descsz
)
3001 case 128: /* GNU/Linux elf_prpsinfo */
3002 elf_tdata (abfd
)->core_program
3003 = _bfd_elfcore_strndup (abfd
, note
->descdata
+ 32, 16);
3004 elf_tdata (abfd
)->core_command
3005 = _bfd_elfcore_strndup (abfd
, note
->descdata
+ 48, 80);
3008 /* Note that for some reason, a spurious space is tacked
3009 onto the end of the args in some (at least one anyway)
3010 implementations, so strip it off if it exists. */
3013 char *command
= elf_tdata (abfd
)->core_command
;
3014 int n
= strlen (command
);
3016 if (0 < n
&& command
[n
- 1] == ' ')
3017 command
[n
- 1] = '\0';
3024 /* Generic Xtensa configurability stuff. */
3026 static xtensa_opcode callx0_op
= XTENSA_UNDEFINED
;
3027 static xtensa_opcode callx4_op
= XTENSA_UNDEFINED
;
3028 static xtensa_opcode callx8_op
= XTENSA_UNDEFINED
;
3029 static xtensa_opcode callx12_op
= XTENSA_UNDEFINED
;
3030 static xtensa_opcode call0_op
= XTENSA_UNDEFINED
;
3031 static xtensa_opcode call4_op
= XTENSA_UNDEFINED
;
3032 static xtensa_opcode call8_op
= XTENSA_UNDEFINED
;
3033 static xtensa_opcode call12_op
= XTENSA_UNDEFINED
;
3036 init_call_opcodes (void)
3038 if (callx0_op
== XTENSA_UNDEFINED
)
3040 callx0_op
= xtensa_opcode_lookup (xtensa_default_isa
, "callx0");
3041 callx4_op
= xtensa_opcode_lookup (xtensa_default_isa
, "callx4");
3042 callx8_op
= xtensa_opcode_lookup (xtensa_default_isa
, "callx8");
3043 callx12_op
= xtensa_opcode_lookup (xtensa_default_isa
, "callx12");
3044 call0_op
= xtensa_opcode_lookup (xtensa_default_isa
, "call0");
3045 call4_op
= xtensa_opcode_lookup (xtensa_default_isa
, "call4");
3046 call8_op
= xtensa_opcode_lookup (xtensa_default_isa
, "call8");
3047 call12_op
= xtensa_opcode_lookup (xtensa_default_isa
, "call12");
3053 is_indirect_call_opcode (xtensa_opcode opcode
)
3055 init_call_opcodes ();
3056 return (opcode
== callx0_op
3057 || opcode
== callx4_op
3058 || opcode
== callx8_op
3059 || opcode
== callx12_op
);
3064 is_direct_call_opcode (xtensa_opcode opcode
)
3066 init_call_opcodes ();
3067 return (opcode
== call0_op
3068 || opcode
== call4_op
3069 || opcode
== call8_op
3070 || opcode
== call12_op
);
3075 is_windowed_call_opcode (xtensa_opcode opcode
)
3077 init_call_opcodes ();
3078 return (opcode
== call4_op
3079 || opcode
== call8_op
3080 || opcode
== call12_op
3081 || opcode
== callx4_op
3082 || opcode
== callx8_op
3083 || opcode
== callx12_op
);
3087 static xtensa_opcode
3088 get_const16_opcode (void)
3090 static bfd_boolean done_lookup
= FALSE
;
3091 static xtensa_opcode const16_opcode
= XTENSA_UNDEFINED
;
3094 const16_opcode
= xtensa_opcode_lookup (xtensa_default_isa
, "const16");
3097 return const16_opcode
;
3101 static xtensa_opcode
3102 get_l32r_opcode (void)
3104 static xtensa_opcode l32r_opcode
= XTENSA_UNDEFINED
;
3105 static bfd_boolean done_lookup
= FALSE
;
3109 l32r_opcode
= xtensa_opcode_lookup (xtensa_default_isa
, "l32r");
3117 l32r_offset (bfd_vma addr
, bfd_vma pc
)
3121 offset
= addr
- ((pc
+3) & -4);
3122 BFD_ASSERT ((offset
& ((1 << 2) - 1)) == 0);
3123 offset
= (signed int) offset
>> 2;
3124 BFD_ASSERT ((signed int) offset
>> 16 == -1);
3130 get_relocation_opnd (xtensa_opcode opcode
, int r_type
)
3132 xtensa_isa isa
= xtensa_default_isa
;
3133 int last_immed
, last_opnd
, opi
;
3135 if (opcode
== XTENSA_UNDEFINED
)
3136 return XTENSA_UNDEFINED
;
3138 /* Find the last visible PC-relative immediate operand for the opcode.
3139 If there are no PC-relative immediates, then choose the last visible
3140 immediate; otherwise, fail and return XTENSA_UNDEFINED. */
3141 last_immed
= XTENSA_UNDEFINED
;
3142 last_opnd
= xtensa_opcode_num_operands (isa
, opcode
);
3143 for (opi
= last_opnd
- 1; opi
>= 0; opi
--)
3145 if (xtensa_operand_is_visible (isa
, opcode
, opi
) == 0)
3147 if (xtensa_operand_is_PCrelative (isa
, opcode
, opi
) == 1)
3152 if (last_immed
== XTENSA_UNDEFINED
3153 && xtensa_operand_is_register (isa
, opcode
, opi
) == 0)
3157 return XTENSA_UNDEFINED
;
3159 /* If the operand number was specified in an old-style relocation,
3160 check for consistency with the operand computed above. */
3161 if (r_type
>= R_XTENSA_OP0
&& r_type
<= R_XTENSA_OP2
)
3163 int reloc_opnd
= r_type
- R_XTENSA_OP0
;
3164 if (reloc_opnd
!= last_immed
)
3165 return XTENSA_UNDEFINED
;
3173 get_relocation_slot (int r_type
)
3183 if (r_type
>= R_XTENSA_SLOT0_OP
&& r_type
<= R_XTENSA_SLOT14_OP
)
3184 return r_type
- R_XTENSA_SLOT0_OP
;
3185 if (r_type
>= R_XTENSA_SLOT0_ALT
&& r_type
<= R_XTENSA_SLOT14_ALT
)
3186 return r_type
- R_XTENSA_SLOT0_ALT
;
3190 return XTENSA_UNDEFINED
;
3194 /* Get the opcode for a relocation. */
3196 static xtensa_opcode
3197 get_relocation_opcode (bfd
*abfd
,
3200 Elf_Internal_Rela
*irel
)
3202 static xtensa_insnbuf ibuff
= NULL
;
3203 static xtensa_insnbuf sbuff
= NULL
;
3204 xtensa_isa isa
= xtensa_default_isa
;
3208 if (contents
== NULL
)
3209 return XTENSA_UNDEFINED
;
3211 if (bfd_get_section_limit (abfd
, sec
) <= irel
->r_offset
)
3212 return XTENSA_UNDEFINED
;
3216 ibuff
= xtensa_insnbuf_alloc (isa
);
3217 sbuff
= xtensa_insnbuf_alloc (isa
);
3220 /* Decode the instruction. */
3221 xtensa_insnbuf_from_chars (isa
, ibuff
, &contents
[irel
->r_offset
],
3222 sec
->size
- irel
->r_offset
);
3223 fmt
= xtensa_format_decode (isa
, ibuff
);
3224 slot
= get_relocation_slot (ELF32_R_TYPE (irel
->r_info
));
3225 if (slot
== XTENSA_UNDEFINED
)
3226 return XTENSA_UNDEFINED
;
3227 xtensa_format_get_slot (isa
, fmt
, slot
, ibuff
, sbuff
);
3228 return xtensa_opcode_decode (isa
, fmt
, slot
, sbuff
);
3233 is_l32r_relocation (bfd
*abfd
,
3236 Elf_Internal_Rela
*irel
)
3238 xtensa_opcode opcode
;
3239 if (!is_operand_relocation (ELF32_R_TYPE (irel
->r_info
)))
3241 opcode
= get_relocation_opcode (abfd
, sec
, contents
, irel
);
3242 return (opcode
== get_l32r_opcode ());
3246 static bfd_size_type
3247 get_asm_simplify_size (bfd_byte
*contents
,
3248 bfd_size_type content_len
,
3249 bfd_size_type offset
)
3251 bfd_size_type insnlen
, size
= 0;
3253 /* Decode the size of the next two instructions. */
3254 insnlen
= insn_decode_len (contents
, content_len
, offset
);
3260 insnlen
= insn_decode_len (contents
, content_len
, offset
+ size
);
3270 is_alt_relocation (int r_type
)
3272 return (r_type
>= R_XTENSA_SLOT0_ALT
3273 && r_type
<= R_XTENSA_SLOT14_ALT
);
3278 is_operand_relocation (int r_type
)
3288 if (r_type
>= R_XTENSA_SLOT0_OP
&& r_type
<= R_XTENSA_SLOT14_OP
)
3290 if (r_type
>= R_XTENSA_SLOT0_ALT
&& r_type
<= R_XTENSA_SLOT14_ALT
)
3299 #define MIN_INSN_LENGTH 2
3301 /* Return 0 if it fails to decode. */
3304 insn_decode_len (bfd_byte
*contents
,
3305 bfd_size_type content_len
,
3306 bfd_size_type offset
)
3309 xtensa_isa isa
= xtensa_default_isa
;
3311 static xtensa_insnbuf ibuff
= NULL
;
3313 if (offset
+ MIN_INSN_LENGTH
> content_len
)
3317 ibuff
= xtensa_insnbuf_alloc (isa
);
3318 xtensa_insnbuf_from_chars (isa
, ibuff
, &contents
[offset
],
3319 content_len
- offset
);
3320 fmt
= xtensa_format_decode (isa
, ibuff
);
3321 if (fmt
== XTENSA_UNDEFINED
)
3323 insn_len
= xtensa_format_length (isa
, fmt
);
3324 if (insn_len
== XTENSA_UNDEFINED
)
3330 /* Decode the opcode for a single slot instruction.
3331 Return 0 if it fails to decode or the instruction is multi-slot. */
3334 insn_decode_opcode (bfd_byte
*contents
,
3335 bfd_size_type content_len
,
3336 bfd_size_type offset
,
3339 xtensa_isa isa
= xtensa_default_isa
;
3341 static xtensa_insnbuf insnbuf
= NULL
;
3342 static xtensa_insnbuf slotbuf
= NULL
;
3344 if (offset
+ MIN_INSN_LENGTH
> content_len
)
3345 return XTENSA_UNDEFINED
;
3347 if (insnbuf
== NULL
)
3349 insnbuf
= xtensa_insnbuf_alloc (isa
);
3350 slotbuf
= xtensa_insnbuf_alloc (isa
);
3353 xtensa_insnbuf_from_chars (isa
, insnbuf
, &contents
[offset
],
3354 content_len
- offset
);
3355 fmt
= xtensa_format_decode (isa
, insnbuf
);
3356 if (fmt
== XTENSA_UNDEFINED
)
3357 return XTENSA_UNDEFINED
;
3359 if (slot
>= xtensa_format_num_slots (isa
, fmt
))
3360 return XTENSA_UNDEFINED
;
3362 xtensa_format_get_slot (isa
, fmt
, slot
, insnbuf
, slotbuf
);
3363 return xtensa_opcode_decode (isa
, fmt
, slot
, slotbuf
);
3367 /* The offset is the offset in the contents.
3368 The address is the address of that offset. */
3371 check_branch_target_aligned (bfd_byte
*contents
,
3372 bfd_size_type content_length
,
3376 bfd_size_type insn_len
= insn_decode_len (contents
, content_length
, offset
);
3379 return check_branch_target_aligned_address (address
, insn_len
);
3384 check_loop_aligned (bfd_byte
*contents
,
3385 bfd_size_type content_length
,
3389 bfd_size_type loop_len
, insn_len
;
3390 xtensa_opcode opcode
;
3392 opcode
= insn_decode_opcode (contents
, content_length
, offset
, 0);
3393 if (opcode
== XTENSA_UNDEFINED
3394 || xtensa_opcode_is_loop (xtensa_default_isa
, opcode
) != 1)
3400 loop_len
= insn_decode_len (contents
, content_length
, offset
);
3401 insn_len
= insn_decode_len (contents
, content_length
, offset
+ loop_len
);
3402 if (loop_len
== 0 || insn_len
== 0)
3408 return check_branch_target_aligned_address (address
+ loop_len
, insn_len
);
3413 check_branch_target_aligned_address (bfd_vma addr
, int len
)
3416 return (addr
% 8 == 0);
3417 return ((addr
>> 2) == ((addr
+ len
- 1) >> 2));
3421 /* Instruction widening and narrowing. */
3423 /* When FLIX is available we need to access certain instructions only
3424 when they are 16-bit or 24-bit instructions. This table caches
3425 information about such instructions by walking through all the
3426 opcodes and finding the smallest single-slot format into which each
3429 static xtensa_format
*op_single_fmt_table
= NULL
;
3433 init_op_single_format_table (void)
3435 xtensa_isa isa
= xtensa_default_isa
;
3436 xtensa_insnbuf ibuf
;
3437 xtensa_opcode opcode
;
3441 if (op_single_fmt_table
)
3444 ibuf
= xtensa_insnbuf_alloc (isa
);
3445 num_opcodes
= xtensa_isa_num_opcodes (isa
);
3447 op_single_fmt_table
= (xtensa_format
*)
3448 bfd_malloc (sizeof (xtensa_format
) * num_opcodes
);
3449 for (opcode
= 0; opcode
< num_opcodes
; opcode
++)
3451 op_single_fmt_table
[opcode
] = XTENSA_UNDEFINED
;
3452 for (fmt
= 0; fmt
< xtensa_isa_num_formats (isa
); fmt
++)
3454 if (xtensa_format_num_slots (isa
, fmt
) == 1
3455 && xtensa_opcode_encode (isa
, fmt
, 0, ibuf
, opcode
) == 0)
3457 xtensa_opcode old_fmt
= op_single_fmt_table
[opcode
];
3458 int fmt_length
= xtensa_format_length (isa
, fmt
);
3459 if (old_fmt
== XTENSA_UNDEFINED
3460 || fmt_length
< xtensa_format_length (isa
, old_fmt
))
3461 op_single_fmt_table
[opcode
] = fmt
;
3465 xtensa_insnbuf_free (isa
, ibuf
);
3469 static xtensa_format
3470 get_single_format (xtensa_opcode opcode
)
3472 init_op_single_format_table ();
3473 return op_single_fmt_table
[opcode
];
3477 /* For the set of narrowable instructions we do NOT include the
3478 narrowings beqz -> beqz.n or bnez -> bnez.n because of complexities
3479 involved during linker relaxation that may require these to
3480 re-expand in some conditions. Also, the narrowing "or" -> mov.n
3481 requires special case code to ensure it only works when op1 == op2. */
3489 struct string_pair narrowable
[] =
3492 { "addi", "addi.n" },
3493 { "addmi", "addi.n" },
3494 { "l32i", "l32i.n" },
3495 { "movi", "movi.n" },
3497 { "retw", "retw.n" },
3498 { "s32i", "s32i.n" },
3499 { "or", "mov.n" } /* special case only when op1 == op2 */
3502 struct string_pair widenable
[] =
3505 { "addi", "addi.n" },
3506 { "addmi", "addi.n" },
3507 { "beqz", "beqz.n" },
3508 { "bnez", "bnez.n" },
3509 { "l32i", "l32i.n" },
3510 { "movi", "movi.n" },
3512 { "retw", "retw.n" },
3513 { "s32i", "s32i.n" },
3514 { "or", "mov.n" } /* special case only when op1 == op2 */
3518 /* Check if an instruction can be "narrowed", i.e., changed from a standard
3519 3-byte instruction to a 2-byte "density" instruction. If it is valid,
3520 return the instruction buffer holding the narrow instruction. Otherwise,
3521 return 0. The set of valid narrowing are specified by a string table
3522 but require some special case operand checks in some cases. */
3524 static xtensa_insnbuf
3525 can_narrow_instruction (xtensa_insnbuf slotbuf
,
3527 xtensa_opcode opcode
)
3529 xtensa_isa isa
= xtensa_default_isa
;
3530 xtensa_format o_fmt
;
3533 static xtensa_insnbuf o_insnbuf
= NULL
;
3534 static xtensa_insnbuf o_slotbuf
= NULL
;
3536 if (o_insnbuf
== NULL
)
3538 o_insnbuf
= xtensa_insnbuf_alloc (isa
);
3539 o_slotbuf
= xtensa_insnbuf_alloc (isa
);
3542 for (opi
= 0; opi
< (sizeof (narrowable
)/sizeof (struct string_pair
)); opi
++)
3544 bfd_boolean is_or
= (strcmp ("or", narrowable
[opi
].wide
) == 0);
3546 if (opcode
== xtensa_opcode_lookup (isa
, narrowable
[opi
].wide
))
3548 uint32 value
, newval
;
3549 int i
, operand_count
, o_operand_count
;
3550 xtensa_opcode o_opcode
;
3552 /* Address does not matter in this case. We might need to
3553 fix it to handle branches/jumps. */
3554 bfd_vma self_address
= 0;
3556 o_opcode
= xtensa_opcode_lookup (isa
, narrowable
[opi
].narrow
);
3557 if (o_opcode
== XTENSA_UNDEFINED
)
3559 o_fmt
= get_single_format (o_opcode
);
3560 if (o_fmt
== XTENSA_UNDEFINED
)
3563 if (xtensa_format_length (isa
, fmt
) != 3
3564 || xtensa_format_length (isa
, o_fmt
) != 2)
3567 xtensa_format_encode (isa
, o_fmt
, o_insnbuf
);
3568 operand_count
= xtensa_opcode_num_operands (isa
, opcode
);
3569 o_operand_count
= xtensa_opcode_num_operands (isa
, o_opcode
);
3571 if (xtensa_opcode_encode (isa
, o_fmt
, 0, o_slotbuf
, o_opcode
) != 0)
3576 if (xtensa_opcode_num_operands (isa
, o_opcode
) != operand_count
)
3581 uint32 rawval0
, rawval1
, rawval2
;
3583 if (o_operand_count
+ 1 != operand_count
3584 || xtensa_operand_get_field (isa
, opcode
, 0,
3585 fmt
, 0, slotbuf
, &rawval0
) != 0
3586 || xtensa_operand_get_field (isa
, opcode
, 1,
3587 fmt
, 0, slotbuf
, &rawval1
) != 0
3588 || xtensa_operand_get_field (isa
, opcode
, 2,
3589 fmt
, 0, slotbuf
, &rawval2
) != 0
3590 || rawval1
!= rawval2
3591 || rawval0
== rawval1
/* it is a nop */)
3595 for (i
= 0; i
< o_operand_count
; ++i
)
3597 if (xtensa_operand_get_field (isa
, opcode
, i
, fmt
, 0,
3599 || xtensa_operand_decode (isa
, opcode
, i
, &value
))
3602 /* PC-relative branches need adjustment, but
3603 the PC-rel operand will always have a relocation. */
3605 if (xtensa_operand_do_reloc (isa
, o_opcode
, i
, &newval
,
3607 || xtensa_operand_encode (isa
, o_opcode
, i
, &newval
)
3608 || xtensa_operand_set_field (isa
, o_opcode
, i
, o_fmt
, 0,
3613 if (xtensa_format_set_slot (isa
, o_fmt
, 0, o_insnbuf
, o_slotbuf
))
3623 /* Attempt to narrow an instruction. If the narrowing is valid, perform
3624 the action in-place directly into the contents and return TRUE. Otherwise,
3625 the return value is FALSE and the contents are not modified. */
3628 narrow_instruction (bfd_byte
*contents
,
3629 bfd_size_type content_length
,
3630 bfd_size_type offset
)
3632 xtensa_opcode opcode
;
3633 bfd_size_type insn_len
;
3634 xtensa_isa isa
= xtensa_default_isa
;
3636 xtensa_insnbuf o_insnbuf
;
3638 static xtensa_insnbuf insnbuf
= NULL
;
3639 static xtensa_insnbuf slotbuf
= NULL
;
3641 if (insnbuf
== NULL
)
3643 insnbuf
= xtensa_insnbuf_alloc (isa
);
3644 slotbuf
= xtensa_insnbuf_alloc (isa
);
3647 BFD_ASSERT (offset
< content_length
);
3649 if (content_length
< 2)
3652 /* We will hand-code a few of these for a little while.
3653 These have all been specified in the assembler aleady. */
3654 xtensa_insnbuf_from_chars (isa
, insnbuf
, &contents
[offset
],
3655 content_length
- offset
);
3656 fmt
= xtensa_format_decode (isa
, insnbuf
);
3657 if (xtensa_format_num_slots (isa
, fmt
) != 1)
3660 if (xtensa_format_get_slot (isa
, fmt
, 0, insnbuf
, slotbuf
) != 0)
3663 opcode
= xtensa_opcode_decode (isa
, fmt
, 0, slotbuf
);
3664 if (opcode
== XTENSA_UNDEFINED
)
3666 insn_len
= xtensa_format_length (isa
, fmt
);
3667 if (insn_len
> content_length
)
3670 o_insnbuf
= can_narrow_instruction (slotbuf
, fmt
, opcode
);
3673 xtensa_insnbuf_to_chars (isa
, o_insnbuf
, contents
+ offset
,
3674 content_length
- offset
);
3682 /* Check if an instruction can be "widened", i.e., changed from a 2-byte
3683 "density" instruction to a standard 3-byte instruction. If it is valid,
3684 return the instruction buffer holding the wide instruction. Otherwise,
3685 return 0. The set of valid widenings are specified by a string table
3686 but require some special case operand checks in some cases. */
3688 static xtensa_insnbuf
3689 can_widen_instruction (xtensa_insnbuf slotbuf
,
3691 xtensa_opcode opcode
)
3693 xtensa_isa isa
= xtensa_default_isa
;
3694 xtensa_format o_fmt
;
3697 static xtensa_insnbuf o_insnbuf
= NULL
;
3698 static xtensa_insnbuf o_slotbuf
= NULL
;
3700 if (o_insnbuf
== NULL
)
3702 o_insnbuf
= xtensa_insnbuf_alloc (isa
);
3703 o_slotbuf
= xtensa_insnbuf_alloc (isa
);
3706 for (opi
= 0; opi
< (sizeof (widenable
)/sizeof (struct string_pair
)); opi
++)
3708 bfd_boolean is_or
= (strcmp ("or", widenable
[opi
].wide
) == 0);
3709 bfd_boolean is_branch
= (strcmp ("beqz", widenable
[opi
].wide
) == 0
3710 || strcmp ("bnez", widenable
[opi
].wide
) == 0);
3712 if (opcode
== xtensa_opcode_lookup (isa
, widenable
[opi
].narrow
))
3714 uint32 value
, newval
;
3715 int i
, operand_count
, o_operand_count
, check_operand_count
;
3716 xtensa_opcode o_opcode
;
3718 /* Address does not matter in this case. We might need to fix it
3719 to handle branches/jumps. */
3720 bfd_vma self_address
= 0;
3722 o_opcode
= xtensa_opcode_lookup (isa
, widenable
[opi
].wide
);
3723 if (o_opcode
== XTENSA_UNDEFINED
)
3725 o_fmt
= get_single_format (o_opcode
);
3726 if (o_fmt
== XTENSA_UNDEFINED
)
3729 if (xtensa_format_length (isa
, fmt
) != 2
3730 || xtensa_format_length (isa
, o_fmt
) != 3)
3733 xtensa_format_encode (isa
, o_fmt
, o_insnbuf
);
3734 operand_count
= xtensa_opcode_num_operands (isa
, opcode
);
3735 o_operand_count
= xtensa_opcode_num_operands (isa
, o_opcode
);
3736 check_operand_count
= o_operand_count
;
3738 if (xtensa_opcode_encode (isa
, o_fmt
, 0, o_slotbuf
, o_opcode
) != 0)
3743 if (xtensa_opcode_num_operands (isa
, o_opcode
) != operand_count
)
3748 uint32 rawval0
, rawval1
;
3750 if (o_operand_count
!= operand_count
+ 1
3751 || xtensa_operand_get_field (isa
, opcode
, 0,
3752 fmt
, 0, slotbuf
, &rawval0
) != 0
3753 || xtensa_operand_get_field (isa
, opcode
, 1,
3754 fmt
, 0, slotbuf
, &rawval1
) != 0
3755 || rawval0
== rawval1
/* it is a nop */)
3759 check_operand_count
--;
3761 for (i
= 0; i
< check_operand_count
; i
++)
3764 if (is_or
&& i
== o_operand_count
- 1)
3766 if (xtensa_operand_get_field (isa
, opcode
, new_i
, fmt
, 0,
3768 || xtensa_operand_decode (isa
, opcode
, new_i
, &value
))
3771 /* PC-relative branches need adjustment, but
3772 the PC-rel operand will always have a relocation. */
3774 if (xtensa_operand_do_reloc (isa
, o_opcode
, i
, &newval
,
3776 || xtensa_operand_encode (isa
, o_opcode
, i
, &newval
)
3777 || xtensa_operand_set_field (isa
, o_opcode
, i
, o_fmt
, 0,
3782 if (xtensa_format_set_slot (isa
, o_fmt
, 0, o_insnbuf
, o_slotbuf
))
3792 /* Attempt to widen an instruction. If the widening is valid, perform
3793 the action in-place directly into the contents and return TRUE. Otherwise,
3794 the return value is FALSE and the contents are not modified. */
3797 widen_instruction (bfd_byte
*contents
,
3798 bfd_size_type content_length
,
3799 bfd_size_type offset
)
3801 xtensa_opcode opcode
;
3802 bfd_size_type insn_len
;
3803 xtensa_isa isa
= xtensa_default_isa
;
3805 xtensa_insnbuf o_insnbuf
;
3807 static xtensa_insnbuf insnbuf
= NULL
;
3808 static xtensa_insnbuf slotbuf
= NULL
;
3810 if (insnbuf
== NULL
)
3812 insnbuf
= xtensa_insnbuf_alloc (isa
);
3813 slotbuf
= xtensa_insnbuf_alloc (isa
);
3816 BFD_ASSERT (offset
< content_length
);
3818 if (content_length
< 2)
3821 /* We will hand-code a few of these for a little while.
3822 These have all been specified in the assembler aleady. */
3823 xtensa_insnbuf_from_chars (isa
, insnbuf
, &contents
[offset
],
3824 content_length
- offset
);
3825 fmt
= xtensa_format_decode (isa
, insnbuf
);
3826 if (xtensa_format_num_slots (isa
, fmt
) != 1)
3829 if (xtensa_format_get_slot (isa
, fmt
, 0, insnbuf
, slotbuf
) != 0)
3832 opcode
= xtensa_opcode_decode (isa
, fmt
, 0, slotbuf
);
3833 if (opcode
== XTENSA_UNDEFINED
)
3835 insn_len
= xtensa_format_length (isa
, fmt
);
3836 if (insn_len
> content_length
)
3839 o_insnbuf
= can_widen_instruction (slotbuf
, fmt
, opcode
);
3842 xtensa_insnbuf_to_chars (isa
, o_insnbuf
, contents
+ offset
,
3843 content_length
- offset
);
3850 /* Code for transforming CALLs at link-time. */
3852 static bfd_reloc_status_type
3853 elf_xtensa_do_asm_simplify (bfd_byte
*contents
,
3855 bfd_vma content_length
,
3856 char **error_message
)
3858 static xtensa_insnbuf insnbuf
= NULL
;
3859 static xtensa_insnbuf slotbuf
= NULL
;
3860 xtensa_format core_format
= XTENSA_UNDEFINED
;
3861 xtensa_opcode opcode
;
3862 xtensa_opcode direct_call_opcode
;
3863 xtensa_isa isa
= xtensa_default_isa
;
3864 bfd_byte
*chbuf
= contents
+ address
;
3867 if (insnbuf
== NULL
)
3869 insnbuf
= xtensa_insnbuf_alloc (isa
);
3870 slotbuf
= xtensa_insnbuf_alloc (isa
);
3873 if (content_length
< address
)
3875 *error_message
= _("Attempt to convert L32R/CALLX to CALL failed");
3876 return bfd_reloc_other
;
3879 opcode
= get_expanded_call_opcode (chbuf
, content_length
- address
, 0);
3880 direct_call_opcode
= swap_callx_for_call_opcode (opcode
);
3881 if (direct_call_opcode
== XTENSA_UNDEFINED
)
3883 *error_message
= _("Attempt to convert L32R/CALLX to CALL failed");
3884 return bfd_reloc_other
;
3887 /* Assemble a NOP ("or a1, a1, a1") into the 0 byte offset. */
3888 core_format
= xtensa_format_lookup (isa
, "x24");
3889 opcode
= xtensa_opcode_lookup (isa
, "or");
3890 xtensa_opcode_encode (isa
, core_format
, 0, slotbuf
, opcode
);
3891 for (opn
= 0; opn
< 3; opn
++)
3894 xtensa_operand_encode (isa
, opcode
, opn
, ®no
);
3895 xtensa_operand_set_field (isa
, opcode
, opn
, core_format
, 0,
3898 xtensa_format_encode (isa
, core_format
, insnbuf
);
3899 xtensa_format_set_slot (isa
, core_format
, 0, insnbuf
, slotbuf
);
3900 xtensa_insnbuf_to_chars (isa
, insnbuf
, chbuf
, content_length
- address
);
3902 /* Assemble a CALL ("callN 0") into the 3 byte offset. */
3903 xtensa_opcode_encode (isa
, core_format
, 0, slotbuf
, direct_call_opcode
);
3904 xtensa_operand_set_field (isa
, opcode
, 0, core_format
, 0, slotbuf
, 0);
3906 xtensa_format_encode (isa
, core_format
, insnbuf
);
3907 xtensa_format_set_slot (isa
, core_format
, 0, insnbuf
, slotbuf
);
3908 xtensa_insnbuf_to_chars (isa
, insnbuf
, chbuf
+ 3,
3909 content_length
- address
- 3);
3911 return bfd_reloc_ok
;
3915 static bfd_reloc_status_type
3916 contract_asm_expansion (bfd_byte
*contents
,
3917 bfd_vma content_length
,
3918 Elf_Internal_Rela
*irel
,
3919 char **error_message
)
3921 bfd_reloc_status_type retval
=
3922 elf_xtensa_do_asm_simplify (contents
, irel
->r_offset
, content_length
,
3925 if (retval
!= bfd_reloc_ok
)
3926 return bfd_reloc_dangerous
;
3928 /* Update the irel->r_offset field so that the right immediate and
3929 the right instruction are modified during the relocation. */
3930 irel
->r_offset
+= 3;
3931 irel
->r_info
= ELF32_R_INFO (ELF32_R_SYM (irel
->r_info
), R_XTENSA_SLOT0_OP
);
3932 return bfd_reloc_ok
;
3936 static xtensa_opcode
3937 swap_callx_for_call_opcode (xtensa_opcode opcode
)
3939 init_call_opcodes ();
3941 if (opcode
== callx0_op
) return call0_op
;
3942 if (opcode
== callx4_op
) return call4_op
;
3943 if (opcode
== callx8_op
) return call8_op
;
3944 if (opcode
== callx12_op
) return call12_op
;
3946 /* Return XTENSA_UNDEFINED if the opcode is not an indirect call. */
3947 return XTENSA_UNDEFINED
;
3951 /* Check if "buf" is pointing to a "L32R aN; CALLX aN" or "CONST16 aN;
3952 CONST16 aN; CALLX aN" sequence, and if so, return the CALLX opcode.
3953 If not, return XTENSA_UNDEFINED. */
3955 #define L32R_TARGET_REG_OPERAND 0
3956 #define CONST16_TARGET_REG_OPERAND 0
3957 #define CALLN_SOURCE_OPERAND 0
3959 static xtensa_opcode
3960 get_expanded_call_opcode (bfd_byte
*buf
, int bufsize
, bfd_boolean
*p_uses_l32r
)
3962 static xtensa_insnbuf insnbuf
= NULL
;
3963 static xtensa_insnbuf slotbuf
= NULL
;
3965 xtensa_opcode opcode
;
3966 xtensa_isa isa
= xtensa_default_isa
;
3967 uint32 regno
, const16_regno
, call_regno
;
3970 if (insnbuf
== NULL
)
3972 insnbuf
= xtensa_insnbuf_alloc (isa
);
3973 slotbuf
= xtensa_insnbuf_alloc (isa
);
3976 xtensa_insnbuf_from_chars (isa
, insnbuf
, buf
, bufsize
);
3977 fmt
= xtensa_format_decode (isa
, insnbuf
);
3978 if (fmt
== XTENSA_UNDEFINED
3979 || xtensa_format_get_slot (isa
, fmt
, 0, insnbuf
, slotbuf
))
3980 return XTENSA_UNDEFINED
;
3982 opcode
= xtensa_opcode_decode (isa
, fmt
, 0, slotbuf
);
3983 if (opcode
== XTENSA_UNDEFINED
)
3984 return XTENSA_UNDEFINED
;
3986 if (opcode
== get_l32r_opcode ())
3989 *p_uses_l32r
= TRUE
;
3990 if (xtensa_operand_get_field (isa
, opcode
, L32R_TARGET_REG_OPERAND
,
3991 fmt
, 0, slotbuf
, ®no
)
3992 || xtensa_operand_decode (isa
, opcode
, L32R_TARGET_REG_OPERAND
,
3994 return XTENSA_UNDEFINED
;
3996 else if (opcode
== get_const16_opcode ())
3999 *p_uses_l32r
= FALSE
;
4000 if (xtensa_operand_get_field (isa
, opcode
, CONST16_TARGET_REG_OPERAND
,
4001 fmt
, 0, slotbuf
, ®no
)
4002 || xtensa_operand_decode (isa
, opcode
, CONST16_TARGET_REG_OPERAND
,
4004 return XTENSA_UNDEFINED
;
4006 /* Check that the next instruction is also CONST16. */
4007 offset
+= xtensa_format_length (isa
, fmt
);
4008 xtensa_insnbuf_from_chars (isa
, insnbuf
, buf
+ offset
, bufsize
- offset
);
4009 fmt
= xtensa_format_decode (isa
, insnbuf
);
4010 if (fmt
== XTENSA_UNDEFINED
4011 || xtensa_format_get_slot (isa
, fmt
, 0, insnbuf
, slotbuf
))
4012 return XTENSA_UNDEFINED
;
4013 opcode
= xtensa_opcode_decode (isa
, fmt
, 0, slotbuf
);
4014 if (opcode
!= get_const16_opcode ())
4015 return XTENSA_UNDEFINED
;
4017 if (xtensa_operand_get_field (isa
, opcode
, CONST16_TARGET_REG_OPERAND
,
4018 fmt
, 0, slotbuf
, &const16_regno
)
4019 || xtensa_operand_decode (isa
, opcode
, CONST16_TARGET_REG_OPERAND
,
4021 || const16_regno
!= regno
)
4022 return XTENSA_UNDEFINED
;
4025 return XTENSA_UNDEFINED
;
4027 /* Next instruction should be an CALLXn with operand 0 == regno. */
4028 offset
+= xtensa_format_length (isa
, fmt
);
4029 xtensa_insnbuf_from_chars (isa
, insnbuf
, buf
+ offset
, bufsize
- offset
);
4030 fmt
= xtensa_format_decode (isa
, insnbuf
);
4031 if (fmt
== XTENSA_UNDEFINED
4032 || xtensa_format_get_slot (isa
, fmt
, 0, insnbuf
, slotbuf
))
4033 return XTENSA_UNDEFINED
;
4034 opcode
= xtensa_opcode_decode (isa
, fmt
, 0, slotbuf
);
4035 if (opcode
== XTENSA_UNDEFINED
4036 || !is_indirect_call_opcode (opcode
))
4037 return XTENSA_UNDEFINED
;
4039 if (xtensa_operand_get_field (isa
, opcode
, CALLN_SOURCE_OPERAND
,
4040 fmt
, 0, slotbuf
, &call_regno
)
4041 || xtensa_operand_decode (isa
, opcode
, CALLN_SOURCE_OPERAND
,
4043 return XTENSA_UNDEFINED
;
4045 if (call_regno
!= regno
)
4046 return XTENSA_UNDEFINED
;
4052 /* Data structures used during relaxation. */
4054 /* r_reloc: relocation values. */
4056 /* Through the relaxation process, we need to keep track of the values
4057 that will result from evaluating relocations. The standard ELF
4058 relocation structure is not sufficient for this purpose because we're
4059 operating on multiple input files at once, so we need to know which
4060 input file a relocation refers to. The r_reloc structure thus
4061 records both the input file (bfd) and ELF relocation.
4063 For efficiency, an r_reloc also contains a "target_offset" field to
4064 cache the target-section-relative offset value that is represented by
4067 The r_reloc also contains a virtual offset that allows multiple
4068 inserted literals to be placed at the same "address" with
4069 different offsets. */
4071 typedef struct r_reloc_struct r_reloc
;
4073 struct r_reloc_struct
4076 Elf_Internal_Rela rela
;
4077 bfd_vma target_offset
;
4078 bfd_vma virtual_offset
;
4082 /* The r_reloc structure is included by value in literal_value, but not
4083 every literal_value has an associated relocation -- some are simple
4084 constants. In such cases, we set all the fields in the r_reloc
4085 struct to zero. The r_reloc_is_const function should be used to
4086 detect this case. */
4089 r_reloc_is_const (const r_reloc
*r_rel
)
4091 return (r_rel
->abfd
== NULL
);
4096 r_reloc_get_target_offset (const r_reloc
*r_rel
)
4098 bfd_vma target_offset
;
4099 unsigned long r_symndx
;
4101 BFD_ASSERT (!r_reloc_is_const (r_rel
));
4102 r_symndx
= ELF32_R_SYM (r_rel
->rela
.r_info
);
4103 target_offset
= get_elf_r_symndx_offset (r_rel
->abfd
, r_symndx
);
4104 return (target_offset
+ r_rel
->rela
.r_addend
);
4108 static struct elf_link_hash_entry
*
4109 r_reloc_get_hash_entry (const r_reloc
*r_rel
)
4111 unsigned long r_symndx
= ELF32_R_SYM (r_rel
->rela
.r_info
);
4112 return get_elf_r_symndx_hash_entry (r_rel
->abfd
, r_symndx
);
4117 r_reloc_get_section (const r_reloc
*r_rel
)
4119 unsigned long r_symndx
= ELF32_R_SYM (r_rel
->rela
.r_info
);
4120 return get_elf_r_symndx_section (r_rel
->abfd
, r_symndx
);
4125 r_reloc_is_defined (const r_reloc
*r_rel
)
4131 sec
= r_reloc_get_section (r_rel
);
4132 if (sec
== bfd_abs_section_ptr
4133 || sec
== bfd_com_section_ptr
4134 || sec
== bfd_und_section_ptr
)
4141 r_reloc_init (r_reloc
*r_rel
,
4143 Elf_Internal_Rela
*irel
,
4145 bfd_size_type content_length
)
4148 reloc_howto_type
*howto
;
4152 r_rel
->rela
= *irel
;
4154 r_rel
->target_offset
= r_reloc_get_target_offset (r_rel
);
4155 r_rel
->virtual_offset
= 0;
4156 r_type
= ELF32_R_TYPE (r_rel
->rela
.r_info
);
4157 howto
= &elf_howto_table
[r_type
];
4158 if (howto
->partial_inplace
)
4160 bfd_vma inplace_val
;
4161 BFD_ASSERT (r_rel
->rela
.r_offset
< content_length
);
4163 inplace_val
= bfd_get_32 (abfd
, &contents
[r_rel
->rela
.r_offset
]);
4164 r_rel
->target_offset
+= inplace_val
;
4168 memset (r_rel
, 0, sizeof (r_reloc
));
4175 print_r_reloc (FILE *fp
, const r_reloc
*r_rel
)
4177 if (r_reloc_is_defined (r_rel
))
4179 asection
*sec
= r_reloc_get_section (r_rel
);
4180 fprintf (fp
, " %s(%s + ", sec
->owner
->filename
, sec
->name
);
4182 else if (r_reloc_get_hash_entry (r_rel
))
4183 fprintf (fp
, " %s + ", r_reloc_get_hash_entry (r_rel
)->root
.root
.string
);
4185 fprintf (fp
, " ?? + ");
4187 fprintf_vma (fp
, r_rel
->target_offset
);
4188 if (r_rel
->virtual_offset
)
4190 fprintf (fp
, " + ");
4191 fprintf_vma (fp
, r_rel
->virtual_offset
);
4200 /* source_reloc: relocations that reference literals. */
4202 /* To determine whether literals can be coalesced, we need to first
4203 record all the relocations that reference the literals. The
4204 source_reloc structure below is used for this purpose. The
4205 source_reloc entries are kept in a per-literal-section array, sorted
4206 by offset within the literal section (i.e., target offset).
4208 The source_sec and r_rel.rela.r_offset fields identify the source of
4209 the relocation. The r_rel field records the relocation value, i.e.,
4210 the offset of the literal being referenced. The opnd field is needed
4211 to determine the range of the immediate field to which the relocation
4212 applies, so we can determine whether another literal with the same
4213 value is within range. The is_null field is true when the relocation
4214 is being removed (e.g., when an L32R is being removed due to a CALLX
4215 that is converted to a direct CALL). */
4217 typedef struct source_reloc_struct source_reloc
;
4219 struct source_reloc_struct
4221 asection
*source_sec
;
4223 xtensa_opcode opcode
;
4225 bfd_boolean is_null
;
4226 bfd_boolean is_abs_literal
;
4231 init_source_reloc (source_reloc
*reloc
,
4232 asection
*source_sec
,
4233 const r_reloc
*r_rel
,
4234 xtensa_opcode opcode
,
4236 bfd_boolean is_abs_literal
)
4238 reloc
->source_sec
= source_sec
;
4239 reloc
->r_rel
= *r_rel
;
4240 reloc
->opcode
= opcode
;
4242 reloc
->is_null
= FALSE
;
4243 reloc
->is_abs_literal
= is_abs_literal
;
4247 /* Find the source_reloc for a particular source offset and relocation
4248 type. Note that the array is sorted by _target_ offset, so this is
4249 just a linear search. */
4251 static source_reloc
*
4252 find_source_reloc (source_reloc
*src_relocs
,
4255 Elf_Internal_Rela
*irel
)
4259 for (i
= 0; i
< src_count
; i
++)
4261 if (src_relocs
[i
].source_sec
== sec
4262 && src_relocs
[i
].r_rel
.rela
.r_offset
== irel
->r_offset
4263 && (ELF32_R_TYPE (src_relocs
[i
].r_rel
.rela
.r_info
)
4264 == ELF32_R_TYPE (irel
->r_info
)))
4265 return &src_relocs
[i
];
4273 source_reloc_compare (const void *ap
, const void *bp
)
4275 const source_reloc
*a
= (const source_reloc
*) ap
;
4276 const source_reloc
*b
= (const source_reloc
*) bp
;
4278 if (a
->r_rel
.target_offset
!= b
->r_rel
.target_offset
)
4279 return (a
->r_rel
.target_offset
- b
->r_rel
.target_offset
);
4281 /* We don't need to sort on these criteria for correctness,
4282 but enforcing a more strict ordering prevents unstable qsort
4283 from behaving differently with different implementations.
4284 Without the code below we get correct but different results
4285 on Solaris 2.7 and 2.8. We would like to always produce the
4286 same results no matter the host. */
4288 if ((!a
->is_null
) - (!b
->is_null
))
4289 return ((!a
->is_null
) - (!b
->is_null
));
4290 return internal_reloc_compare (&a
->r_rel
.rela
, &b
->r_rel
.rela
);
4294 /* Literal values and value hash tables. */
4296 /* Literals with the same value can be coalesced. The literal_value
4297 structure records the value of a literal: the "r_rel" field holds the
4298 information from the relocation on the literal (if there is one) and
4299 the "value" field holds the contents of the literal word itself.
4301 The value_map structure records a literal value along with the
4302 location of a literal holding that value. The value_map hash table
4303 is indexed by the literal value, so that we can quickly check if a
4304 particular literal value has been seen before and is thus a candidate
4307 typedef struct literal_value_struct literal_value
;
4308 typedef struct value_map_struct value_map
;
4309 typedef struct value_map_hash_table_struct value_map_hash_table
;
4311 struct literal_value_struct
4314 unsigned long value
;
4315 bfd_boolean is_abs_literal
;
4318 struct value_map_struct
4320 literal_value val
; /* The literal value. */
4321 r_reloc loc
; /* Location of the literal. */
4325 struct value_map_hash_table_struct
4327 unsigned bucket_count
;
4328 value_map
**buckets
;
4330 bfd_boolean has_last_loc
;
4336 init_literal_value (literal_value
*lit
,
4337 const r_reloc
*r_rel
,
4338 unsigned long value
,
4339 bfd_boolean is_abs_literal
)
4341 lit
->r_rel
= *r_rel
;
4343 lit
->is_abs_literal
= is_abs_literal
;
4348 literal_value_equal (const literal_value
*src1
,
4349 const literal_value
*src2
,
4350 bfd_boolean final_static_link
)
4352 struct elf_link_hash_entry
*h1
, *h2
;
4354 if (r_reloc_is_const (&src1
->r_rel
) != r_reloc_is_const (&src2
->r_rel
))
4357 if (r_reloc_is_const (&src1
->r_rel
))
4358 return (src1
->value
== src2
->value
);
4360 if (ELF32_R_TYPE (src1
->r_rel
.rela
.r_info
)
4361 != ELF32_R_TYPE (src2
->r_rel
.rela
.r_info
))
4364 if (src1
->r_rel
.target_offset
!= src2
->r_rel
.target_offset
)
4367 if (src1
->r_rel
.virtual_offset
!= src2
->r_rel
.virtual_offset
)
4370 if (src1
->value
!= src2
->value
)
4373 /* Now check for the same section (if defined) or the same elf_hash
4374 (if undefined or weak). */
4375 h1
= r_reloc_get_hash_entry (&src1
->r_rel
);
4376 h2
= r_reloc_get_hash_entry (&src2
->r_rel
);
4377 if (r_reloc_is_defined (&src1
->r_rel
)
4378 && (final_static_link
4379 || ((!h1
|| h1
->root
.type
!= bfd_link_hash_defweak
)
4380 && (!h2
|| h2
->root
.type
!= bfd_link_hash_defweak
))))
4382 if (r_reloc_get_section (&src1
->r_rel
)
4383 != r_reloc_get_section (&src2
->r_rel
))
4388 /* Require that the hash entries (i.e., symbols) be identical. */
4389 if (h1
!= h2
|| h1
== 0)
4393 if (src1
->is_abs_literal
!= src2
->is_abs_literal
)
4400 /* Must be power of 2. */
4401 #define INITIAL_HASH_RELOC_BUCKET_COUNT 1024
4403 static value_map_hash_table
*
4404 value_map_hash_table_init (void)
4406 value_map_hash_table
*values
;
4408 values
= (value_map_hash_table
*)
4409 bfd_zmalloc (sizeof (value_map_hash_table
));
4410 values
->bucket_count
= INITIAL_HASH_RELOC_BUCKET_COUNT
;
4412 values
->buckets
= (value_map
**)
4413 bfd_zmalloc (sizeof (value_map
*) * values
->bucket_count
);
4414 if (values
->buckets
== NULL
)
4419 values
->has_last_loc
= FALSE
;
4426 value_map_hash_table_delete (value_map_hash_table
*table
)
4428 free (table
->buckets
);
4434 hash_bfd_vma (bfd_vma val
)
4436 return (val
>> 2) + (val
>> 10);
4441 literal_value_hash (const literal_value
*src
)
4445 hash_val
= hash_bfd_vma (src
->value
);
4446 if (!r_reloc_is_const (&src
->r_rel
))
4450 hash_val
+= hash_bfd_vma (src
->is_abs_literal
* 1000);
4451 hash_val
+= hash_bfd_vma (src
->r_rel
.target_offset
);
4452 hash_val
+= hash_bfd_vma (src
->r_rel
.virtual_offset
);
4454 /* Now check for the same section and the same elf_hash. */
4455 if (r_reloc_is_defined (&src
->r_rel
))
4456 sec_or_hash
= r_reloc_get_section (&src
->r_rel
);
4458 sec_or_hash
= r_reloc_get_hash_entry (&src
->r_rel
);
4459 hash_val
+= hash_bfd_vma ((bfd_vma
) (size_t) sec_or_hash
);
4465 /* Check if the specified literal_value has been seen before. */
4468 value_map_get_cached_value (value_map_hash_table
*map
,
4469 const literal_value
*val
,
4470 bfd_boolean final_static_link
)
4476 idx
= literal_value_hash (val
);
4477 idx
= idx
& (map
->bucket_count
- 1);
4478 bucket
= map
->buckets
[idx
];
4479 for (map_e
= bucket
; map_e
; map_e
= map_e
->next
)
4481 if (literal_value_equal (&map_e
->val
, val
, final_static_link
))
4488 /* Record a new literal value. It is illegal to call this if VALUE
4489 already has an entry here. */
4492 add_value_map (value_map_hash_table
*map
,
4493 const literal_value
*val
,
4495 bfd_boolean final_static_link
)
4497 value_map
**bucket_p
;
4500 value_map
*val_e
= (value_map
*) bfd_zmalloc (sizeof (value_map
));
4503 bfd_set_error (bfd_error_no_memory
);
4507 BFD_ASSERT (!value_map_get_cached_value (map
, val
, final_static_link
));
4511 idx
= literal_value_hash (val
);
4512 idx
= idx
& (map
->bucket_count
- 1);
4513 bucket_p
= &map
->buckets
[idx
];
4515 val_e
->next
= *bucket_p
;
4518 /* FIXME: Consider resizing the hash table if we get too many entries. */
4524 /* Lists of text actions (ta_) for narrowing, widening, longcall
4525 conversion, space fill, code & literal removal, etc. */
4527 /* The following text actions are generated:
4529 "ta_remove_insn" remove an instruction or instructions
4530 "ta_remove_longcall" convert longcall to call
4531 "ta_convert_longcall" convert longcall to nop/call
4532 "ta_narrow_insn" narrow a wide instruction
4533 "ta_widen" widen a narrow instruction
4534 "ta_fill" add fill or remove fill
4535 removed < 0 is a fill; branches to the fill address will be
4536 changed to address + fill size (e.g., address - removed)
4537 removed >= 0 branches to the fill address will stay unchanged
4538 "ta_remove_literal" remove a literal; this action is
4539 indicated when a literal is removed
4541 "ta_add_literal" insert a new literal; this action is
4542 indicated when a literal has been moved.
4543 It may use a virtual_offset because
4544 multiple literals can be placed at the
4547 For each of these text actions, we also record the number of bytes
4548 removed by performing the text action. In the case of a "ta_widen"
4549 or a "ta_fill" that adds space, the removed_bytes will be negative. */
4551 typedef struct text_action_struct text_action
;
4552 typedef struct text_action_list_struct text_action_list
;
4553 typedef enum text_action_enum_t text_action_t
;
4555 enum text_action_enum_t
4558 ta_remove_insn
, /* removed = -size */
4559 ta_remove_longcall
, /* removed = -size */
4560 ta_convert_longcall
, /* removed = 0 */
4561 ta_narrow_insn
, /* removed = -1 */
4562 ta_widen_insn
, /* removed = +1 */
4563 ta_fill
, /* removed = +size */
4569 /* Structure for a text action record. */
4570 struct text_action_struct
4572 text_action_t action
;
4573 asection
*sec
; /* Optional */
4575 bfd_vma virtual_offset
; /* Zero except for adding literals. */
4577 literal_value value
; /* Only valid when adding literals. */
4583 /* List of all of the actions taken on a text section. */
4584 struct text_action_list_struct
4590 static text_action
*
4591 find_fill_action (text_action_list
*l
, asection
*sec
, bfd_vma offset
)
4595 /* It is not necessary to fill at the end of a section. */
4596 if (sec
->size
== offset
)
4599 for (m_p
= &l
->head
; *m_p
&& (*m_p
)->offset
<= offset
; m_p
= &(*m_p
)->next
)
4601 text_action
*t
= *m_p
;
4602 /* When the action is another fill at the same address,
4603 just increase the size. */
4604 if (t
->offset
== offset
&& t
->action
== ta_fill
)
4612 compute_removed_action_diff (const text_action
*ta
,
4616 int removable_space
)
4619 int current_removed
= 0;
4622 current_removed
= ta
->removed_bytes
;
4624 BFD_ASSERT (ta
== NULL
|| ta
->offset
== offset
);
4625 BFD_ASSERT (ta
== NULL
|| ta
->action
== ta_fill
);
4627 /* It is not necessary to fill at the end of a section. Clean this up. */
4628 if (sec
->size
== offset
)
4629 new_removed
= removable_space
- 0;
4633 int added
= -removed
- current_removed
;
4634 /* Ignore multiples of the section alignment. */
4635 added
= ((1 << sec
->alignment_power
) - 1) & added
;
4636 new_removed
= (-added
);
4638 /* Modify for removable. */
4639 space
= removable_space
- new_removed
;
4640 new_removed
= (removable_space
4641 - (((1 << sec
->alignment_power
) - 1) & space
));
4643 return (new_removed
- current_removed
);
4648 adjust_fill_action (text_action
*ta
, int fill_diff
)
4650 ta
->removed_bytes
+= fill_diff
;
4654 /* Add a modification action to the text. For the case of adding or
4655 removing space, modify any current fill and assume that
4656 "unreachable_space" bytes can be freely contracted. Note that a
4657 negative removed value is a fill. */
4660 text_action_add (text_action_list
*l
,
4661 text_action_t action
,
4669 /* It is not necessary to fill at the end of a section. */
4670 if (action
== ta_fill
&& sec
->size
== offset
)
4673 /* It is not necessary to fill 0 bytes. */
4674 if (action
== ta_fill
&& removed
== 0)
4677 for (m_p
= &l
->head
; *m_p
&& (*m_p
)->offset
<= offset
; m_p
= &(*m_p
)->next
)
4679 text_action
*t
= *m_p
;
4680 /* When the action is another fill at the same address,
4681 just increase the size. */
4682 if (t
->offset
== offset
&& t
->action
== ta_fill
&& action
== ta_fill
)
4684 t
->removed_bytes
+= removed
;
4689 /* Create a new record and fill it up. */
4690 ta
= (text_action
*) bfd_zmalloc (sizeof (text_action
));
4691 ta
->action
= action
;
4693 ta
->offset
= offset
;
4694 ta
->removed_bytes
= removed
;
4701 text_action_add_literal (text_action_list
*l
,
4702 text_action_t action
,
4704 const literal_value
*value
,
4709 asection
*sec
= r_reloc_get_section (loc
);
4710 bfd_vma offset
= loc
->target_offset
;
4711 bfd_vma virtual_offset
= loc
->virtual_offset
;
4713 BFD_ASSERT (action
== ta_add_literal
);
4715 for (m_p
= &l
->head
; *m_p
!= NULL
; m_p
= &(*m_p
)->next
)
4717 if ((*m_p
)->offset
> offset
4718 && ((*m_p
)->offset
!= offset
4719 || (*m_p
)->virtual_offset
> virtual_offset
))
4723 /* Create a new record and fill it up. */
4724 ta
= (text_action
*) bfd_zmalloc (sizeof (text_action
));
4725 ta
->action
= action
;
4727 ta
->offset
= offset
;
4728 ta
->virtual_offset
= virtual_offset
;
4730 ta
->removed_bytes
= removed
;
4737 offset_with_removed_text (text_action_list
*action_list
, bfd_vma offset
)
4742 for (r
= action_list
->head
; r
&& r
->offset
<= offset
; r
= r
->next
)
4744 if (r
->offset
< offset
4745 || (r
->action
== ta_fill
&& r
->removed_bytes
< 0))
4746 removed
+= r
->removed_bytes
;
4749 return (offset
- removed
);
4754 action_list_count (text_action_list
*action_list
)
4756 text_action
*r
= action_list
->head
;
4758 for (r
= action_list
->head
; r
!= NULL
; r
= r
->next
)
4767 offset_with_removed_text_before_fill (text_action_list
*action_list
,
4773 for (r
= action_list
->head
; r
&& r
->offset
< offset
; r
= r
->next
)
4774 removed
+= r
->removed_bytes
;
4776 return (offset
- removed
);
4780 /* The find_insn_action routine will only find non-fill actions. */
4782 static text_action
*
4783 find_insn_action (text_action_list
*action_list
, bfd_vma offset
)
4786 for (t
= action_list
->head
; t
; t
= t
->next
)
4788 if (t
->offset
== offset
)
4795 case ta_remove_insn
:
4796 case ta_remove_longcall
:
4797 case ta_convert_longcall
:
4798 case ta_narrow_insn
:
4801 case ta_remove_literal
:
4802 case ta_add_literal
:
4815 print_action_list (FILE *fp
, text_action_list
*action_list
)
4819 fprintf (fp
, "Text Action\n");
4820 for (r
= action_list
->head
; r
!= NULL
; r
= r
->next
)
4822 const char *t
= "unknown";
4825 case ta_remove_insn
:
4826 t
= "remove_insn"; break;
4827 case ta_remove_longcall
:
4828 t
= "remove_longcall"; break;
4829 case ta_convert_longcall
:
4830 t
= "remove_longcall"; break;
4831 case ta_narrow_insn
:
4832 t
= "narrow_insn"; break;
4834 t
= "widen_insn"; break;
4839 case ta_remove_literal
:
4840 t
= "remove_literal"; break;
4841 case ta_add_literal
:
4842 t
= "add_literal"; break;
4845 fprintf (fp
, "%s: %s[0x%lx] \"%s\" %d\n",
4846 r
->sec
->owner
->filename
,
4847 r
->sec
->name
, r
->offset
, t
, r
->removed_bytes
);
4854 /* Lists of literals being coalesced or removed. */
4856 /* In the usual case, the literal identified by "from" is being
4857 coalesced with another literal identified by "to". If the literal is
4858 unused and is being removed altogether, "to.abfd" will be NULL.
4859 The removed_literal entries are kept on a per-section list, sorted
4860 by the "from" offset field. */
4862 typedef struct removed_literal_struct removed_literal
;
4863 typedef struct removed_literal_list_struct removed_literal_list
;
4865 struct removed_literal_struct
4869 removed_literal
*next
;
4872 struct removed_literal_list_struct
4874 removed_literal
*head
;
4875 removed_literal
*tail
;
4879 /* Record that the literal at "from" is being removed. If "to" is not
4880 NULL, the "from" literal is being coalesced with the "to" literal. */
4883 add_removed_literal (removed_literal_list
*removed_list
,
4884 const r_reloc
*from
,
4887 removed_literal
*r
, *new_r
, *next_r
;
4889 new_r
= (removed_literal
*) bfd_zmalloc (sizeof (removed_literal
));
4891 new_r
->from
= *from
;
4895 new_r
->to
.abfd
= NULL
;
4898 r
= removed_list
->head
;
4901 removed_list
->head
= new_r
;
4902 removed_list
->tail
= new_r
;
4904 /* Special check for common case of append. */
4905 else if (removed_list
->tail
->from
.target_offset
< from
->target_offset
)
4907 removed_list
->tail
->next
= new_r
;
4908 removed_list
->tail
= new_r
;
4912 while (r
->from
.target_offset
< from
->target_offset
&& r
->next
)
4918 new_r
->next
= next_r
;
4920 removed_list
->tail
= new_r
;
4925 /* Check if the list of removed literals contains an entry for the
4926 given address. Return the entry if found. */
4928 static removed_literal
*
4929 find_removed_literal (removed_literal_list
*removed_list
, bfd_vma addr
)
4931 removed_literal
*r
= removed_list
->head
;
4932 while (r
&& r
->from
.target_offset
< addr
)
4934 if (r
&& r
->from
.target_offset
== addr
)
4943 print_removed_literals (FILE *fp
, removed_literal_list
*removed_list
)
4946 r
= removed_list
->head
;
4948 fprintf (fp
, "Removed Literals\n");
4949 for (; r
!= NULL
; r
= r
->next
)
4951 print_r_reloc (fp
, &r
->from
);
4952 fprintf (fp
, " => ");
4953 if (r
->to
.abfd
== NULL
)
4954 fprintf (fp
, "REMOVED");
4956 print_r_reloc (fp
, &r
->to
);
4964 /* Per-section data for relaxation. */
4966 typedef struct reloc_bfd_fix_struct reloc_bfd_fix
;
4968 struct xtensa_relax_info_struct
4970 bfd_boolean is_relaxable_literal_section
;
4971 bfd_boolean is_relaxable_asm_section
;
4972 int visited
; /* Number of times visited. */
4974 source_reloc
*src_relocs
; /* Array[src_count]. */
4976 int src_next
; /* Next src_relocs entry to assign. */
4978 removed_literal_list removed_list
;
4979 text_action_list action_list
;
4981 reloc_bfd_fix
*fix_list
;
4982 reloc_bfd_fix
*fix_array
;
4983 unsigned fix_array_count
;
4985 /* Support for expanding the reloc array that is stored
4986 in the section structure. If the relocations have been
4987 reallocated, the newly allocated relocations will be referenced
4988 here along with the actual size allocated. The relocation
4989 count will always be found in the section structure. */
4990 Elf_Internal_Rela
*allocated_relocs
;
4991 unsigned relocs_count
;
4992 unsigned allocated_relocs_count
;
4995 struct elf_xtensa_section_data
4997 struct bfd_elf_section_data elf
;
4998 xtensa_relax_info relax_info
;
5003 elf_xtensa_new_section_hook (bfd
*abfd
, asection
*sec
)
5005 if (!sec
->used_by_bfd
)
5007 struct elf_xtensa_section_data
*sdata
;
5008 bfd_size_type amt
= sizeof (*sdata
);
5010 sdata
= bfd_zalloc (abfd
, amt
);
5013 sec
->used_by_bfd
= sdata
;
5016 return _bfd_elf_new_section_hook (abfd
, sec
);
5020 static xtensa_relax_info
*
5021 get_xtensa_relax_info (asection
*sec
)
5023 struct elf_xtensa_section_data
*section_data
;
5025 /* No info available if no section or if it is an output section. */
5026 if (!sec
|| sec
== sec
->output_section
)
5029 section_data
= (struct elf_xtensa_section_data
*) elf_section_data (sec
);
5030 return §ion_data
->relax_info
;
5035 init_xtensa_relax_info (asection
*sec
)
5037 xtensa_relax_info
*relax_info
= get_xtensa_relax_info (sec
);
5039 relax_info
->is_relaxable_literal_section
= FALSE
;
5040 relax_info
->is_relaxable_asm_section
= FALSE
;
5041 relax_info
->visited
= 0;
5043 relax_info
->src_relocs
= NULL
;
5044 relax_info
->src_count
= 0;
5045 relax_info
->src_next
= 0;
5047 relax_info
->removed_list
.head
= NULL
;
5048 relax_info
->removed_list
.tail
= NULL
;
5050 relax_info
->action_list
.head
= NULL
;
5052 relax_info
->fix_list
= NULL
;
5053 relax_info
->fix_array
= NULL
;
5054 relax_info
->fix_array_count
= 0;
5056 relax_info
->allocated_relocs
= NULL
;
5057 relax_info
->relocs_count
= 0;
5058 relax_info
->allocated_relocs_count
= 0;
5062 /* Coalescing literals may require a relocation to refer to a section in
5063 a different input file, but the standard relocation information
5064 cannot express that. Instead, the reloc_bfd_fix structures are used
5065 to "fix" the relocations that refer to sections in other input files.
5066 These structures are kept on per-section lists. The "src_type" field
5067 records the relocation type in case there are multiple relocations on
5068 the same location. FIXME: This is ugly; an alternative might be to
5069 add new symbols with the "owner" field to some other input file. */
5071 struct reloc_bfd_fix_struct
5075 unsigned src_type
; /* Relocation type. */
5078 asection
*target_sec
;
5079 bfd_vma target_offset
;
5080 bfd_boolean translated
;
5082 reloc_bfd_fix
*next
;
5086 static reloc_bfd_fix
*
5087 reloc_bfd_fix_init (asection
*src_sec
,
5091 asection
*target_sec
,
5092 bfd_vma target_offset
,
5093 bfd_boolean translated
)
5097 fix
= (reloc_bfd_fix
*) bfd_malloc (sizeof (reloc_bfd_fix
));
5098 fix
->src_sec
= src_sec
;
5099 fix
->src_offset
= src_offset
;
5100 fix
->src_type
= src_type
;
5101 fix
->target_abfd
= target_abfd
;
5102 fix
->target_sec
= target_sec
;
5103 fix
->target_offset
= target_offset
;
5104 fix
->translated
= translated
;
5111 add_fix (asection
*src_sec
, reloc_bfd_fix
*fix
)
5113 xtensa_relax_info
*relax_info
;
5115 relax_info
= get_xtensa_relax_info (src_sec
);
5116 fix
->next
= relax_info
->fix_list
;
5117 relax_info
->fix_list
= fix
;
5122 fix_compare (const void *ap
, const void *bp
)
5124 const reloc_bfd_fix
*a
= (const reloc_bfd_fix
*) ap
;
5125 const reloc_bfd_fix
*b
= (const reloc_bfd_fix
*) bp
;
5127 if (a
->src_offset
!= b
->src_offset
)
5128 return (a
->src_offset
- b
->src_offset
);
5129 return (a
->src_type
- b
->src_type
);
5134 cache_fix_array (asection
*sec
)
5136 unsigned i
, count
= 0;
5138 xtensa_relax_info
*relax_info
= get_xtensa_relax_info (sec
);
5140 if (relax_info
== NULL
)
5142 if (relax_info
->fix_list
== NULL
)
5145 for (r
= relax_info
->fix_list
; r
!= NULL
; r
= r
->next
)
5148 relax_info
->fix_array
=
5149 (reloc_bfd_fix
*) bfd_malloc (sizeof (reloc_bfd_fix
) * count
);
5150 relax_info
->fix_array_count
= count
;
5152 r
= relax_info
->fix_list
;
5153 for (i
= 0; i
< count
; i
++, r
= r
->next
)
5155 relax_info
->fix_array
[count
- 1 - i
] = *r
;
5156 relax_info
->fix_array
[count
- 1 - i
].next
= NULL
;
5159 qsort (relax_info
->fix_array
, relax_info
->fix_array_count
,
5160 sizeof (reloc_bfd_fix
), fix_compare
);
5164 static reloc_bfd_fix
*
5165 get_bfd_fix (asection
*sec
, bfd_vma offset
, unsigned type
)
5167 xtensa_relax_info
*relax_info
= get_xtensa_relax_info (sec
);
5171 if (relax_info
== NULL
)
5173 if (relax_info
->fix_list
== NULL
)
5176 if (relax_info
->fix_array
== NULL
)
5177 cache_fix_array (sec
);
5179 key
.src_offset
= offset
;
5180 key
.src_type
= type
;
5181 rv
= bsearch (&key
, relax_info
->fix_array
, relax_info
->fix_array_count
,
5182 sizeof (reloc_bfd_fix
), fix_compare
);
5187 /* Section caching. */
5189 typedef struct section_cache_struct section_cache_t
;
5191 struct section_cache_struct
5195 bfd_byte
*contents
; /* Cache of the section contents. */
5196 bfd_size_type content_length
;
5198 property_table_entry
*ptbl
; /* Cache of the section property table. */
5201 Elf_Internal_Rela
*relocs
; /* Cache of the section relocations. */
5202 unsigned reloc_count
;
5207 init_section_cache (section_cache_t
*sec_cache
)
5209 memset (sec_cache
, 0, sizeof (*sec_cache
));
5214 clear_section_cache (section_cache_t
*sec_cache
)
5218 release_contents (sec_cache
->sec
, sec_cache
->contents
);
5219 release_internal_relocs (sec_cache
->sec
, sec_cache
->relocs
);
5220 if (sec_cache
->ptbl
)
5221 free (sec_cache
->ptbl
);
5222 memset (sec_cache
, 0, sizeof (sec_cache
));
5228 section_cache_section (section_cache_t
*sec_cache
,
5230 struct bfd_link_info
*link_info
)
5233 property_table_entry
*prop_table
= NULL
;
5235 bfd_byte
*contents
= NULL
;
5236 Elf_Internal_Rela
*internal_relocs
= NULL
;
5237 bfd_size_type sec_size
;
5241 if (sec
== sec_cache
->sec
)
5245 sec_size
= bfd_get_section_limit (abfd
, sec
);
5247 /* Get the contents. */
5248 contents
= retrieve_contents (abfd
, sec
, link_info
->keep_memory
);
5249 if (contents
== NULL
&& sec_size
!= 0)
5252 /* Get the relocations. */
5253 internal_relocs
= retrieve_internal_relocs (abfd
, sec
,
5254 link_info
->keep_memory
);
5256 /* Get the entry table. */
5257 ptblsize
= xtensa_read_table_entries (abfd
, sec
, &prop_table
,
5258 XTENSA_PROP_SEC_NAME
, FALSE
);
5262 /* Fill in the new section cache. */
5263 clear_section_cache (sec_cache
);
5264 memset (sec_cache
, 0, sizeof (sec_cache
));
5266 sec_cache
->sec
= sec
;
5267 sec_cache
->contents
= contents
;
5268 sec_cache
->content_length
= sec_size
;
5269 sec_cache
->relocs
= internal_relocs
;
5270 sec_cache
->reloc_count
= sec
->reloc_count
;
5271 sec_cache
->pte_count
= ptblsize
;
5272 sec_cache
->ptbl
= prop_table
;
5277 release_contents (sec
, contents
);
5278 release_internal_relocs (sec
, internal_relocs
);
5285 /* Extended basic blocks. */
5287 /* An ebb_struct represents an Extended Basic Block. Within this
5288 range, we guarantee that all instructions are decodable, the
5289 property table entries are contiguous, and no property table
5290 specifies a segment that cannot have instructions moved. This
5291 structure contains caches of the contents, property table and
5292 relocations for the specified section for easy use. The range is
5293 specified by ranges of indices for the byte offset, property table
5294 offsets and relocation offsets. These must be consistent. */
5296 typedef struct ebb_struct ebb_t
;
5302 bfd_byte
*contents
; /* Cache of the section contents. */
5303 bfd_size_type content_length
;
5305 property_table_entry
*ptbl
; /* Cache of the section property table. */
5308 Elf_Internal_Rela
*relocs
; /* Cache of the section relocations. */
5309 unsigned reloc_count
;
5311 bfd_vma start_offset
; /* Offset in section. */
5312 unsigned start_ptbl_idx
; /* Offset in the property table. */
5313 unsigned start_reloc_idx
; /* Offset in the relocations. */
5316 unsigned end_ptbl_idx
;
5317 unsigned end_reloc_idx
;
5319 bfd_boolean ends_section
; /* Is this the last ebb in a section? */
5321 /* The unreachable property table at the end of this set of blocks;
5322 NULL if the end is not an unreachable block. */
5323 property_table_entry
*ends_unreachable
;
5327 enum ebb_target_enum
5330 EBB_DESIRE_TGT_ALIGN
,
5331 EBB_REQUIRE_TGT_ALIGN
,
5332 EBB_REQUIRE_LOOP_ALIGN
,
5337 /* proposed_action_struct is similar to the text_action_struct except
5338 that is represents a potential transformation, not one that will
5339 occur. We build a list of these for an extended basic block
5340 and use them to compute the actual actions desired. We must be
5341 careful that the entire set of actual actions we perform do not
5342 break any relocations that would fit if the actions were not
5345 typedef struct proposed_action_struct proposed_action
;
5347 struct proposed_action_struct
5349 enum ebb_target_enum align_type
; /* for the target alignment */
5350 bfd_vma alignment_pow
;
5351 text_action_t action
;
5354 bfd_boolean do_action
; /* If false, then we will not perform the action. */
5358 /* The ebb_constraint_struct keeps a set of proposed actions for an
5359 extended basic block. */
5361 typedef struct ebb_constraint_struct ebb_constraint
;
5363 struct ebb_constraint_struct
5366 bfd_boolean start_movable
;
5368 /* Bytes of extra space at the beginning if movable. */
5369 int start_extra_space
;
5371 enum ebb_target_enum start_align
;
5373 bfd_boolean end_movable
;
5375 /* Bytes of extra space at the end if movable. */
5376 int end_extra_space
;
5378 unsigned action_count
;
5379 unsigned action_allocated
;
5381 /* Array of proposed actions. */
5382 proposed_action
*actions
;
5384 /* Action alignments -- one for each proposed action. */
5385 enum ebb_target_enum
*action_aligns
;
5390 init_ebb_constraint (ebb_constraint
*c
)
5392 memset (c
, 0, sizeof (ebb_constraint
));
5397 free_ebb_constraint (ebb_constraint
*c
)
5405 init_ebb (ebb_t
*ebb
,
5408 bfd_size_type content_length
,
5409 property_table_entry
*prop_table
,
5411 Elf_Internal_Rela
*internal_relocs
,
5412 unsigned reloc_count
)
5414 memset (ebb
, 0, sizeof (ebb_t
));
5416 ebb
->contents
= contents
;
5417 ebb
->content_length
= content_length
;
5418 ebb
->ptbl
= prop_table
;
5419 ebb
->pte_count
= ptblsize
;
5420 ebb
->relocs
= internal_relocs
;
5421 ebb
->reloc_count
= reloc_count
;
5422 ebb
->start_offset
= 0;
5423 ebb
->end_offset
= ebb
->content_length
- 1;
5424 ebb
->start_ptbl_idx
= 0;
5425 ebb
->end_ptbl_idx
= ptblsize
;
5426 ebb
->start_reloc_idx
= 0;
5427 ebb
->end_reloc_idx
= reloc_count
;
5431 /* Extend the ebb to all decodable contiguous sections. The algorithm
5432 for building a basic block around an instruction is to push it
5433 forward until we hit the end of a section, an unreachable block or
5434 a block that cannot be transformed. Then we push it backwards
5435 searching for similar conditions. */
5437 static bfd_boolean
extend_ebb_bounds_forward (ebb_t
*);
5438 static bfd_boolean
extend_ebb_bounds_backward (ebb_t
*);
5439 static bfd_size_type insn_block_decodable_len
5440 (bfd_byte
*, bfd_size_type
, bfd_vma
, bfd_size_type
);
5443 extend_ebb_bounds (ebb_t
*ebb
)
5445 if (!extend_ebb_bounds_forward (ebb
))
5447 if (!extend_ebb_bounds_backward (ebb
))
5454 extend_ebb_bounds_forward (ebb_t
*ebb
)
5456 property_table_entry
*the_entry
, *new_entry
;
5458 the_entry
= &ebb
->ptbl
[ebb
->end_ptbl_idx
];
5460 /* Stop when (1) we cannot decode an instruction, (2) we are at
5461 the end of the property tables, (3) we hit a non-contiguous property
5462 table entry, (4) we hit a NO_TRANSFORM region. */
5467 bfd_size_type insn_block_len
;
5469 entry_end
= the_entry
->address
- ebb
->sec
->vma
+ the_entry
->size
;
5471 insn_block_decodable_len (ebb
->contents
, ebb
->content_length
,
5473 entry_end
- ebb
->end_offset
);
5474 if (insn_block_len
!= (entry_end
- ebb
->end_offset
))
5476 (*_bfd_error_handler
)
5477 (_("%B(%A+0x%lx): could not decode instruction; possible configuration mismatch"),
5478 ebb
->sec
->owner
, ebb
->sec
, ebb
->end_offset
+ insn_block_len
);
5481 ebb
->end_offset
+= insn_block_len
;
5483 if (ebb
->end_offset
== ebb
->sec
->size
)
5484 ebb
->ends_section
= TRUE
;
5486 /* Update the reloc counter. */
5487 while (ebb
->end_reloc_idx
+ 1 < ebb
->reloc_count
5488 && (ebb
->relocs
[ebb
->end_reloc_idx
+ 1].r_offset
5491 ebb
->end_reloc_idx
++;
5494 if (ebb
->end_ptbl_idx
+ 1 == ebb
->pte_count
)
5497 new_entry
= &ebb
->ptbl
[ebb
->end_ptbl_idx
+ 1];
5498 if (((new_entry
->flags
& XTENSA_PROP_INSN
) == 0)
5499 || ((new_entry
->flags
& XTENSA_PROP_INSN_NO_TRANSFORM
) != 0)
5500 || ((the_entry
->flags
& XTENSA_PROP_ALIGN
) != 0))
5503 if (the_entry
->address
+ the_entry
->size
!= new_entry
->address
)
5506 the_entry
= new_entry
;
5507 ebb
->end_ptbl_idx
++;
5510 /* Quick check for an unreachable or end of file just at the end. */
5511 if (ebb
->end_ptbl_idx
+ 1 == ebb
->pte_count
)
5513 if (ebb
->end_offset
== ebb
->content_length
)
5514 ebb
->ends_section
= TRUE
;
5518 new_entry
= &ebb
->ptbl
[ebb
->end_ptbl_idx
+ 1];
5519 if ((new_entry
->flags
& XTENSA_PROP_UNREACHABLE
) != 0
5520 && the_entry
->address
+ the_entry
->size
== new_entry
->address
)
5521 ebb
->ends_unreachable
= new_entry
;
5524 /* Any other ending requires exact alignment. */
5530 extend_ebb_bounds_backward (ebb_t
*ebb
)
5532 property_table_entry
*the_entry
, *new_entry
;
5534 the_entry
= &ebb
->ptbl
[ebb
->start_ptbl_idx
];
5536 /* Stop when (1) we cannot decode the instructions in the current entry.
5537 (2) we are at the beginning of the property tables, (3) we hit a
5538 non-contiguous property table entry, (4) we hit a NO_TRANSFORM region. */
5542 bfd_vma block_begin
;
5543 bfd_size_type insn_block_len
;
5545 block_begin
= the_entry
->address
- ebb
->sec
->vma
;
5547 insn_block_decodable_len (ebb
->contents
, ebb
->content_length
,
5549 ebb
->start_offset
- block_begin
);
5550 if (insn_block_len
!= ebb
->start_offset
- block_begin
)
5552 (*_bfd_error_handler
)
5553 (_("%B(%A+0x%lx): could not decode instruction; possible configuration mismatch"),
5554 ebb
->sec
->owner
, ebb
->sec
, ebb
->end_offset
+ insn_block_len
);
5557 ebb
->start_offset
-= insn_block_len
;
5559 /* Update the reloc counter. */
5560 while (ebb
->start_reloc_idx
> 0
5561 && (ebb
->relocs
[ebb
->start_reloc_idx
- 1].r_offset
5562 >= ebb
->start_offset
))
5564 ebb
->start_reloc_idx
--;
5567 if (ebb
->start_ptbl_idx
== 0)
5570 new_entry
= &ebb
->ptbl
[ebb
->start_ptbl_idx
- 1];
5571 if ((new_entry
->flags
& XTENSA_PROP_INSN
) == 0
5572 || ((new_entry
->flags
& XTENSA_PROP_INSN_NO_TRANSFORM
) != 0)
5573 || ((new_entry
->flags
& XTENSA_PROP_ALIGN
) != 0))
5575 if (new_entry
->address
+ new_entry
->size
!= the_entry
->address
)
5578 the_entry
= new_entry
;
5579 ebb
->start_ptbl_idx
--;
5585 static bfd_size_type
5586 insn_block_decodable_len (bfd_byte
*contents
,
5587 bfd_size_type content_len
,
5588 bfd_vma block_offset
,
5589 bfd_size_type block_len
)
5591 bfd_vma offset
= block_offset
;
5593 while (offset
< block_offset
+ block_len
)
5595 bfd_size_type insn_len
= 0;
5597 insn_len
= insn_decode_len (contents
, content_len
, offset
);
5599 return (offset
- block_offset
);
5602 return (offset
- block_offset
);
5607 ebb_propose_action (ebb_constraint
*c
,
5608 enum ebb_target_enum align_type
,
5609 bfd_vma alignment_pow
,
5610 text_action_t action
,
5613 bfd_boolean do_action
)
5615 proposed_action
*act
;
5617 if (c
->action_allocated
<= c
->action_count
)
5619 unsigned new_allocated
, i
;
5620 proposed_action
*new_actions
;
5622 new_allocated
= (c
->action_count
+ 2) * 2;
5623 new_actions
= (proposed_action
*)
5624 bfd_zmalloc (sizeof (proposed_action
) * new_allocated
);
5626 for (i
= 0; i
< c
->action_count
; i
++)
5627 new_actions
[i
] = c
->actions
[i
];
5630 c
->actions
= new_actions
;
5631 c
->action_allocated
= new_allocated
;
5634 act
= &c
->actions
[c
->action_count
];
5635 act
->align_type
= align_type
;
5636 act
->alignment_pow
= alignment_pow
;
5637 act
->action
= action
;
5638 act
->offset
= offset
;
5639 act
->removed_bytes
= removed_bytes
;
5640 act
->do_action
= do_action
;
5646 /* Access to internal relocations, section contents and symbols. */
5648 /* During relaxation, we need to modify relocations, section contents,
5649 and symbol definitions, and we need to keep the original values from
5650 being reloaded from the input files, i.e., we need to "pin" the
5651 modified values in memory. We also want to continue to observe the
5652 setting of the "keep-memory" flag. The following functions wrap the
5653 standard BFD functions to take care of this for us. */
5655 static Elf_Internal_Rela
*
5656 retrieve_internal_relocs (bfd
*abfd
, asection
*sec
, bfd_boolean keep_memory
)
5658 Elf_Internal_Rela
*internal_relocs
;
5660 if ((sec
->flags
& SEC_LINKER_CREATED
) != 0)
5663 internal_relocs
= elf_section_data (sec
)->relocs
;
5664 if (internal_relocs
== NULL
)
5665 internal_relocs
= (_bfd_elf_link_read_relocs
5666 (abfd
, sec
, NULL
, NULL
, keep_memory
));
5667 return internal_relocs
;
5672 pin_internal_relocs (asection
*sec
, Elf_Internal_Rela
*internal_relocs
)
5674 elf_section_data (sec
)->relocs
= internal_relocs
;
5679 release_internal_relocs (asection
*sec
, Elf_Internal_Rela
*internal_relocs
)
5682 && elf_section_data (sec
)->relocs
!= internal_relocs
)
5683 free (internal_relocs
);
5688 retrieve_contents (bfd
*abfd
, asection
*sec
, bfd_boolean keep_memory
)
5691 bfd_size_type sec_size
;
5693 sec_size
= bfd_get_section_limit (abfd
, sec
);
5694 contents
= elf_section_data (sec
)->this_hdr
.contents
;
5696 if (contents
== NULL
&& sec_size
!= 0)
5698 if (!bfd_malloc_and_get_section (abfd
, sec
, &contents
))
5705 elf_section_data (sec
)->this_hdr
.contents
= contents
;
5712 pin_contents (asection
*sec
, bfd_byte
*contents
)
5714 elf_section_data (sec
)->this_hdr
.contents
= contents
;
5719 release_contents (asection
*sec
, bfd_byte
*contents
)
5721 if (contents
&& elf_section_data (sec
)->this_hdr
.contents
!= contents
)
5726 static Elf_Internal_Sym
*
5727 retrieve_local_syms (bfd
*input_bfd
)
5729 Elf_Internal_Shdr
*symtab_hdr
;
5730 Elf_Internal_Sym
*isymbuf
;
5733 symtab_hdr
= &elf_tdata (input_bfd
)->symtab_hdr
;
5734 locsymcount
= symtab_hdr
->sh_info
;
5736 isymbuf
= (Elf_Internal_Sym
*) symtab_hdr
->contents
;
5737 if (isymbuf
== NULL
&& locsymcount
!= 0)
5738 isymbuf
= bfd_elf_get_elf_syms (input_bfd
, symtab_hdr
, locsymcount
, 0,
5741 /* Save the symbols for this input file so they won't be read again. */
5742 if (isymbuf
&& isymbuf
!= (Elf_Internal_Sym
*) symtab_hdr
->contents
)
5743 symtab_hdr
->contents
= (unsigned char *) isymbuf
;
5749 /* Code for link-time relaxation. */
5751 /* Initialization for relaxation: */
5752 static bfd_boolean
analyze_relocations (struct bfd_link_info
*);
5753 static bfd_boolean find_relaxable_sections
5754 (bfd
*, asection
*, struct bfd_link_info
*, bfd_boolean
*);
5755 static bfd_boolean collect_source_relocs
5756 (bfd
*, asection
*, struct bfd_link_info
*);
5757 static bfd_boolean is_resolvable_asm_expansion
5758 (bfd
*, asection
*, bfd_byte
*, Elf_Internal_Rela
*, struct bfd_link_info
*,
5760 static Elf_Internal_Rela
*find_associated_l32r_irel
5761 (bfd
*, asection
*, bfd_byte
*, Elf_Internal_Rela
*, Elf_Internal_Rela
*);
5762 static bfd_boolean compute_text_actions
5763 (bfd
*, asection
*, struct bfd_link_info
*);
5764 static bfd_boolean
compute_ebb_proposed_actions (ebb_constraint
*);
5765 static bfd_boolean
compute_ebb_actions (ebb_constraint
*);
5766 static bfd_boolean check_section_ebb_pcrels_fit
5767 (bfd
*, asection
*, bfd_byte
*, Elf_Internal_Rela
*, const ebb_constraint
*,
5768 const xtensa_opcode
*);
5769 static bfd_boolean
check_section_ebb_reduces (const ebb_constraint
*);
5770 static void text_action_add_proposed
5771 (text_action_list
*, const ebb_constraint
*, asection
*);
5772 static int compute_fill_extra_space (property_table_entry
*);
5775 static bfd_boolean compute_removed_literals
5776 (bfd
*, asection
*, struct bfd_link_info
*, value_map_hash_table
*);
5777 static Elf_Internal_Rela
*get_irel_at_offset
5778 (asection
*, Elf_Internal_Rela
*, bfd_vma
);
5779 static bfd_boolean is_removable_literal
5780 (const source_reloc
*, int, const source_reloc
*, int);
5781 static bfd_boolean remove_dead_literal
5782 (bfd
*, asection
*, struct bfd_link_info
*, Elf_Internal_Rela
*,
5783 Elf_Internal_Rela
*, source_reloc
*, property_table_entry
*, int);
5784 static bfd_boolean identify_literal_placement
5785 (bfd
*, asection
*, bfd_byte
*, struct bfd_link_info
*,
5786 value_map_hash_table
*, bfd_boolean
*, Elf_Internal_Rela
*, int,
5787 source_reloc
*, property_table_entry
*, int, section_cache_t
*,
5789 static bfd_boolean
relocations_reach (source_reloc
*, int, const r_reloc
*);
5790 static bfd_boolean coalesce_shared_literal
5791 (asection
*, source_reloc
*, property_table_entry
*, int, value_map
*);
5792 static bfd_boolean move_shared_literal
5793 (asection
*, struct bfd_link_info
*, source_reloc
*, property_table_entry
*,
5794 int, const r_reloc
*, const literal_value
*, section_cache_t
*);
5797 static bfd_boolean
relax_section (bfd
*, asection
*, struct bfd_link_info
*);
5798 static bfd_boolean
translate_section_fixes (asection
*);
5799 static bfd_boolean
translate_reloc_bfd_fix (reloc_bfd_fix
*);
5800 static void translate_reloc (const r_reloc
*, r_reloc
*);
5801 static void shrink_dynamic_reloc_sections
5802 (struct bfd_link_info
*, bfd
*, asection
*, Elf_Internal_Rela
*);
5803 static bfd_boolean move_literal
5804 (bfd
*, struct bfd_link_info
*, asection
*, bfd_vma
, bfd_byte
*,
5805 xtensa_relax_info
*, Elf_Internal_Rela
**, const literal_value
*);
5806 static bfd_boolean relax_property_section
5807 (bfd
*, asection
*, struct bfd_link_info
*);
5810 static bfd_boolean
relax_section_symbols (bfd
*, asection
*);
5814 elf_xtensa_relax_section (bfd
*abfd
,
5816 struct bfd_link_info
*link_info
,
5819 static value_map_hash_table
*values
= NULL
;
5820 static bfd_boolean relocations_analyzed
= FALSE
;
5821 xtensa_relax_info
*relax_info
;
5823 if (!relocations_analyzed
)
5825 /* Do some overall initialization for relaxation. */
5826 values
= value_map_hash_table_init ();
5829 relaxing_section
= TRUE
;
5830 if (!analyze_relocations (link_info
))
5832 relocations_analyzed
= TRUE
;
5836 /* Don't mess with linker-created sections. */
5837 if ((sec
->flags
& SEC_LINKER_CREATED
) != 0)
5840 relax_info
= get_xtensa_relax_info (sec
);
5841 BFD_ASSERT (relax_info
!= NULL
);
5843 switch (relax_info
->visited
)
5846 /* Note: It would be nice to fold this pass into
5847 analyze_relocations, but it is important for this step that the
5848 sections be examined in link order. */
5849 if (!compute_removed_literals (abfd
, sec
, link_info
, values
))
5856 value_map_hash_table_delete (values
);
5858 if (!relax_section (abfd
, sec
, link_info
))
5864 if (!relax_section_symbols (abfd
, sec
))
5869 relax_info
->visited
++;
5874 /* Initialization for relaxation. */
5876 /* This function is called once at the start of relaxation. It scans
5877 all the input sections and marks the ones that are relaxable (i.e.,
5878 literal sections with L32R relocations against them), and then
5879 collects source_reloc information for all the relocations against
5880 those relaxable sections. During this process, it also detects
5881 longcalls, i.e., calls relaxed by the assembler into indirect
5882 calls, that can be optimized back into direct calls. Within each
5883 extended basic block (ebb) containing an optimized longcall, it
5884 computes a set of "text actions" that can be performed to remove
5885 the L32R associated with the longcall while optionally preserving
5886 branch target alignments. */
5889 analyze_relocations (struct bfd_link_info
*link_info
)
5893 bfd_boolean is_relaxable
= FALSE
;
5895 /* Initialize the per-section relaxation info. */
5896 for (abfd
= link_info
->input_bfds
; abfd
!= NULL
; abfd
= abfd
->link_next
)
5897 for (sec
= abfd
->sections
; sec
!= NULL
; sec
= sec
->next
)
5899 init_xtensa_relax_info (sec
);
5902 /* Mark relaxable sections (and count relocations against each one). */
5903 for (abfd
= link_info
->input_bfds
; abfd
!= NULL
; abfd
= abfd
->link_next
)
5904 for (sec
= abfd
->sections
; sec
!= NULL
; sec
= sec
->next
)
5906 if (!find_relaxable_sections (abfd
, sec
, link_info
, &is_relaxable
))
5910 /* Bail out if there are no relaxable sections. */
5914 /* Allocate space for source_relocs. */
5915 for (abfd
= link_info
->input_bfds
; abfd
!= NULL
; abfd
= abfd
->link_next
)
5916 for (sec
= abfd
->sections
; sec
!= NULL
; sec
= sec
->next
)
5918 xtensa_relax_info
*relax_info
;
5920 relax_info
= get_xtensa_relax_info (sec
);
5921 if (relax_info
->is_relaxable_literal_section
5922 || relax_info
->is_relaxable_asm_section
)
5924 relax_info
->src_relocs
= (source_reloc
*)
5925 bfd_malloc (relax_info
->src_count
* sizeof (source_reloc
));
5929 /* Collect info on relocations against each relaxable section. */
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 (!collect_source_relocs (abfd
, sec
, link_info
))
5937 /* Compute the text actions. */
5938 for (abfd
= link_info
->input_bfds
; abfd
!= NULL
; abfd
= abfd
->link_next
)
5939 for (sec
= abfd
->sections
; sec
!= NULL
; sec
= sec
->next
)
5941 if (!compute_text_actions (abfd
, sec
, link_info
))
5949 /* Find all the sections that might be relaxed. The motivation for
5950 this pass is that collect_source_relocs() needs to record _all_ the
5951 relocations that target each relaxable section. That is expensive
5952 and unnecessary unless the target section is actually going to be
5953 relaxed. This pass identifies all such sections by checking if
5954 they have L32Rs pointing to them. In the process, the total number
5955 of relocations targeting each section is also counted so that we
5956 know how much space to allocate for source_relocs against each
5957 relaxable literal section. */
5960 find_relaxable_sections (bfd
*abfd
,
5962 struct bfd_link_info
*link_info
,
5963 bfd_boolean
*is_relaxable_p
)
5965 Elf_Internal_Rela
*internal_relocs
;
5967 bfd_boolean ok
= TRUE
;
5969 xtensa_relax_info
*source_relax_info
;
5971 internal_relocs
= retrieve_internal_relocs (abfd
, sec
,
5972 link_info
->keep_memory
);
5973 if (internal_relocs
== NULL
)
5976 contents
= retrieve_contents (abfd
, sec
, link_info
->keep_memory
);
5977 if (contents
== NULL
&& sec
->size
!= 0)
5983 source_relax_info
= get_xtensa_relax_info (sec
);
5984 for (i
= 0; i
< sec
->reloc_count
; i
++)
5986 Elf_Internal_Rela
*irel
= &internal_relocs
[i
];
5988 asection
*target_sec
;
5989 xtensa_relax_info
*target_relax_info
;
5991 /* If this section has not already been marked as "relaxable", and
5992 if it contains any ASM_EXPAND relocations (marking expanded
5993 longcalls) that can be optimized into direct calls, then mark
5994 the section as "relaxable". */
5995 if (source_relax_info
5996 && !source_relax_info
->is_relaxable_asm_section
5997 && ELF32_R_TYPE (irel
->r_info
) == R_XTENSA_ASM_EXPAND
)
5999 bfd_boolean is_reachable
= FALSE
;
6000 if (is_resolvable_asm_expansion (abfd
, sec
, contents
, irel
,
6001 link_info
, &is_reachable
)
6004 source_relax_info
->is_relaxable_asm_section
= TRUE
;
6005 *is_relaxable_p
= TRUE
;
6009 r_reloc_init (&r_rel
, abfd
, irel
, contents
,
6010 bfd_get_section_limit (abfd
, sec
));
6012 target_sec
= r_reloc_get_section (&r_rel
);
6013 target_relax_info
= get_xtensa_relax_info (target_sec
);
6014 if (!target_relax_info
)
6017 /* Count PC-relative operand relocations against the target section.
6018 Note: The conditions tested here must match the conditions under
6019 which init_source_reloc is called in collect_source_relocs(). */
6020 if (is_operand_relocation (ELF32_R_TYPE (irel
->r_info
))
6021 && (!is_alt_relocation (ELF32_R_TYPE (irel
->r_info
))
6022 || is_l32r_relocation (abfd
, sec
, contents
, irel
)))
6023 target_relax_info
->src_count
++;
6025 if (is_l32r_relocation (abfd
, sec
, contents
, irel
)
6026 && r_reloc_is_defined (&r_rel
))
6028 /* Mark the target section as relaxable. */
6029 target_relax_info
->is_relaxable_literal_section
= TRUE
;
6030 *is_relaxable_p
= TRUE
;
6035 release_contents (sec
, contents
);
6036 release_internal_relocs (sec
, internal_relocs
);
6041 /* Record _all_ the relocations that point to relaxable sections, and
6042 get rid of ASM_EXPAND relocs by either converting them to
6043 ASM_SIMPLIFY or by removing them. */
6046 collect_source_relocs (bfd
*abfd
,
6048 struct bfd_link_info
*link_info
)
6050 Elf_Internal_Rela
*internal_relocs
;
6052 bfd_boolean ok
= TRUE
;
6054 bfd_size_type sec_size
;
6056 internal_relocs
= retrieve_internal_relocs (abfd
, sec
,
6057 link_info
->keep_memory
);
6058 if (internal_relocs
== NULL
)
6061 sec_size
= bfd_get_section_limit (abfd
, sec
);
6062 contents
= retrieve_contents (abfd
, sec
, link_info
->keep_memory
);
6063 if (contents
== NULL
&& sec_size
!= 0)
6069 /* Record relocations against relaxable literal sections. */
6070 for (i
= 0; i
< sec
->reloc_count
; i
++)
6072 Elf_Internal_Rela
*irel
= &internal_relocs
[i
];
6074 asection
*target_sec
;
6075 xtensa_relax_info
*target_relax_info
;
6077 r_reloc_init (&r_rel
, abfd
, irel
, contents
, sec_size
);
6079 target_sec
= r_reloc_get_section (&r_rel
);
6080 target_relax_info
= get_xtensa_relax_info (target_sec
);
6082 if (target_relax_info
6083 && (target_relax_info
->is_relaxable_literal_section
6084 || target_relax_info
->is_relaxable_asm_section
))
6086 xtensa_opcode opcode
= XTENSA_UNDEFINED
;
6088 bfd_boolean is_abs_literal
= FALSE
;
6090 if (is_alt_relocation (ELF32_R_TYPE (irel
->r_info
)))
6092 /* None of the current alternate relocs are PC-relative,
6093 and only PC-relative relocs matter here. However, we
6094 still need to record the opcode for literal
6096 opcode
= get_relocation_opcode (abfd
, sec
, contents
, irel
);
6097 if (opcode
== get_l32r_opcode ())
6099 is_abs_literal
= TRUE
;
6103 opcode
= XTENSA_UNDEFINED
;
6105 else if (is_operand_relocation (ELF32_R_TYPE (irel
->r_info
)))
6107 opcode
= get_relocation_opcode (abfd
, sec
, contents
, irel
);
6108 opnd
= get_relocation_opnd (opcode
, ELF32_R_TYPE (irel
->r_info
));
6111 if (opcode
!= XTENSA_UNDEFINED
)
6113 int src_next
= target_relax_info
->src_next
++;
6114 source_reloc
*s_reloc
= &target_relax_info
->src_relocs
[src_next
];
6116 init_source_reloc (s_reloc
, sec
, &r_rel
, opcode
, opnd
,
6122 /* Now get rid of ASM_EXPAND relocations. At this point, the
6123 src_relocs array for the target literal section may still be
6124 incomplete, but it must at least contain the entries for the L32R
6125 relocations associated with ASM_EXPANDs because they were just
6126 added in the preceding loop over the relocations. */
6128 for (i
= 0; i
< sec
->reloc_count
; i
++)
6130 Elf_Internal_Rela
*irel
= &internal_relocs
[i
];
6131 bfd_boolean is_reachable
;
6133 if (!is_resolvable_asm_expansion (abfd
, sec
, contents
, irel
, link_info
,
6139 Elf_Internal_Rela
*l32r_irel
;
6141 asection
*target_sec
;
6142 xtensa_relax_info
*target_relax_info
;
6144 /* Mark the source_reloc for the L32R so that it will be
6145 removed in compute_removed_literals(), along with the
6146 associated literal. */
6147 l32r_irel
= find_associated_l32r_irel (abfd
, sec
, contents
,
6148 irel
, internal_relocs
);
6149 if (l32r_irel
== NULL
)
6152 r_reloc_init (&r_rel
, abfd
, l32r_irel
, contents
, sec_size
);
6154 target_sec
= r_reloc_get_section (&r_rel
);
6155 target_relax_info
= get_xtensa_relax_info (target_sec
);
6157 if (target_relax_info
6158 && (target_relax_info
->is_relaxable_literal_section
6159 || target_relax_info
->is_relaxable_asm_section
))
6161 source_reloc
*s_reloc
;
6163 /* Search the source_relocs for the entry corresponding to
6164 the l32r_irel. Note: The src_relocs array is not yet
6165 sorted, but it wouldn't matter anyway because we're
6166 searching by source offset instead of target offset. */
6167 s_reloc
= find_source_reloc (target_relax_info
->src_relocs
,
6168 target_relax_info
->src_next
,
6170 BFD_ASSERT (s_reloc
);
6171 s_reloc
->is_null
= TRUE
;
6174 /* Convert this reloc to ASM_SIMPLIFY. */
6175 irel
->r_info
= ELF32_R_INFO (ELF32_R_SYM (irel
->r_info
),
6176 R_XTENSA_ASM_SIMPLIFY
);
6177 l32r_irel
->r_info
= ELF32_R_INFO (0, R_XTENSA_NONE
);
6179 pin_internal_relocs (sec
, internal_relocs
);
6183 /* It is resolvable but doesn't reach. We resolve now
6184 by eliminating the relocation -- the call will remain
6185 expanded into L32R/CALLX. */
6186 irel
->r_info
= ELF32_R_INFO (0, R_XTENSA_NONE
);
6187 pin_internal_relocs (sec
, internal_relocs
);
6192 release_contents (sec
, contents
);
6193 release_internal_relocs (sec
, internal_relocs
);
6198 /* Return TRUE if the asm expansion can be resolved. Generally it can
6199 be resolved on a final link or when a partial link locates it in the
6200 same section as the target. Set "is_reachable" flag if the target of
6201 the call is within the range of a direct call, given the current VMA
6202 for this section and the target section. */
6205 is_resolvable_asm_expansion (bfd
*abfd
,
6208 Elf_Internal_Rela
*irel
,
6209 struct bfd_link_info
*link_info
,
6210 bfd_boolean
*is_reachable_p
)
6212 asection
*target_sec
;
6213 bfd_vma target_offset
;
6215 xtensa_opcode opcode
, direct_call_opcode
;
6216 bfd_vma self_address
;
6217 bfd_vma dest_address
;
6218 bfd_boolean uses_l32r
;
6219 bfd_size_type sec_size
;
6221 *is_reachable_p
= FALSE
;
6223 if (contents
== NULL
)
6226 if (ELF32_R_TYPE (irel
->r_info
) != R_XTENSA_ASM_EXPAND
)
6229 sec_size
= bfd_get_section_limit (abfd
, sec
);
6230 opcode
= get_expanded_call_opcode (contents
+ irel
->r_offset
,
6231 sec_size
- irel
->r_offset
, &uses_l32r
);
6232 /* Optimization of longcalls that use CONST16 is not yet implemented. */
6236 direct_call_opcode
= swap_callx_for_call_opcode (opcode
);
6237 if (direct_call_opcode
== XTENSA_UNDEFINED
)
6240 /* Check and see that the target resolves. */
6241 r_reloc_init (&r_rel
, abfd
, irel
, contents
, sec_size
);
6242 if (!r_reloc_is_defined (&r_rel
))
6245 target_sec
= r_reloc_get_section (&r_rel
);
6246 target_offset
= r_rel
.target_offset
;
6248 /* If the target is in a shared library, then it doesn't reach. This
6249 isn't supposed to come up because the compiler should never generate
6250 non-PIC calls on systems that use shared libraries, but the linker
6251 shouldn't crash regardless. */
6252 if (!target_sec
->output_section
)
6255 /* For relocatable sections, we can only simplify when the output
6256 section of the target is the same as the output section of the
6258 if (link_info
->relocatable
6259 && (target_sec
->output_section
!= sec
->output_section
6260 || is_reloc_sym_weak (abfd
, irel
)))
6263 self_address
= (sec
->output_section
->vma
6264 + sec
->output_offset
+ irel
->r_offset
+ 3);
6265 dest_address
= (target_sec
->output_section
->vma
6266 + target_sec
->output_offset
+ target_offset
);
6268 *is_reachable_p
= pcrel_reloc_fits (direct_call_opcode
, 0,
6269 self_address
, dest_address
);
6271 if ((self_address
>> CALL_SEGMENT_BITS
) !=
6272 (dest_address
>> CALL_SEGMENT_BITS
))
6279 static Elf_Internal_Rela
*
6280 find_associated_l32r_irel (bfd
*abfd
,
6283 Elf_Internal_Rela
*other_irel
,
6284 Elf_Internal_Rela
*internal_relocs
)
6288 for (i
= 0; i
< sec
->reloc_count
; i
++)
6290 Elf_Internal_Rela
*irel
= &internal_relocs
[i
];
6292 if (irel
== other_irel
)
6294 if (irel
->r_offset
!= other_irel
->r_offset
)
6296 if (is_l32r_relocation (abfd
, sec
, contents
, irel
))
6304 static xtensa_opcode
*
6305 build_reloc_opcodes (bfd
*abfd
,
6308 Elf_Internal_Rela
*internal_relocs
)
6311 xtensa_opcode
*reloc_opcodes
=
6312 (xtensa_opcode
*) bfd_malloc (sizeof (xtensa_opcode
) * sec
->reloc_count
);
6313 for (i
= 0; i
< sec
->reloc_count
; i
++)
6315 Elf_Internal_Rela
*irel
= &internal_relocs
[i
];
6316 reloc_opcodes
[i
] = get_relocation_opcode (abfd
, sec
, contents
, irel
);
6318 return reloc_opcodes
;
6322 /* The compute_text_actions function will build a list of potential
6323 transformation actions for code in the extended basic block of each
6324 longcall that is optimized to a direct call. From this list we
6325 generate a set of actions to actually perform that optimizes for
6326 space and, if not using size_opt, maintains branch target
6329 These actions to be performed are placed on a per-section list.
6330 The actual changes are performed by relax_section() in the second
6334 compute_text_actions (bfd
*abfd
,
6336 struct bfd_link_info
*link_info
)
6338 xtensa_opcode
*reloc_opcodes
= NULL
;
6339 xtensa_relax_info
*relax_info
;
6341 Elf_Internal_Rela
*internal_relocs
;
6342 bfd_boolean ok
= TRUE
;
6344 property_table_entry
*prop_table
= 0;
6346 bfd_size_type sec_size
;
6347 static bfd_boolean no_insn_move
= FALSE
;
6352 /* Do nothing if the section contains no optimized longcalls. */
6353 relax_info
= get_xtensa_relax_info (sec
);
6354 BFD_ASSERT (relax_info
);
6355 if (!relax_info
->is_relaxable_asm_section
)
6358 internal_relocs
= retrieve_internal_relocs (abfd
, sec
,
6359 link_info
->keep_memory
);
6361 if (internal_relocs
)
6362 qsort (internal_relocs
, sec
->reloc_count
, sizeof (Elf_Internal_Rela
),
6363 internal_reloc_compare
);
6365 sec_size
= bfd_get_section_limit (abfd
, sec
);
6366 contents
= retrieve_contents (abfd
, sec
, link_info
->keep_memory
);
6367 if (contents
== NULL
&& sec_size
!= 0)
6373 ptblsize
= xtensa_read_table_entries (abfd
, sec
, &prop_table
,
6374 XTENSA_PROP_SEC_NAME
, FALSE
);
6381 for (i
= 0; i
< sec
->reloc_count
; i
++)
6383 Elf_Internal_Rela
*irel
= &internal_relocs
[i
];
6385 property_table_entry
*the_entry
;
6388 ebb_constraint ebb_table
;
6389 bfd_size_type simplify_size
;
6391 if (irel
&& ELF32_R_TYPE (irel
->r_info
) != R_XTENSA_ASM_SIMPLIFY
)
6393 r_offset
= irel
->r_offset
;
6395 simplify_size
= get_asm_simplify_size (contents
, sec_size
, r_offset
);
6396 if (simplify_size
== 0)
6398 (*_bfd_error_handler
)
6399 (_("%B(%A+0x%lx): could not decode instruction for XTENSA_ASM_SIMPLIFY relocation; possible configuration mismatch"),
6400 sec
->owner
, sec
, r_offset
);
6404 /* If the instruction table is not around, then don't do this
6406 the_entry
= elf_xtensa_find_property_entry (prop_table
, ptblsize
,
6407 sec
->vma
+ irel
->r_offset
);
6408 if (the_entry
== NULL
|| XTENSA_NO_NOP_REMOVAL
)
6410 text_action_add (&relax_info
->action_list
,
6411 ta_convert_longcall
, sec
, r_offset
,
6416 /* If the next longcall happens to be at the same address as an
6417 unreachable section of size 0, then skip forward. */
6418 ptbl_idx
= the_entry
- prop_table
;
6419 while ((the_entry
->flags
& XTENSA_PROP_UNREACHABLE
)
6420 && the_entry
->size
== 0
6421 && ptbl_idx
+ 1 < ptblsize
6422 && (prop_table
[ptbl_idx
+ 1].address
6423 == prop_table
[ptbl_idx
].address
))
6429 if (the_entry
->flags
& XTENSA_PROP_INSN_NO_TRANSFORM
)
6430 /* NO_REORDER is OK */
6433 init_ebb_constraint (&ebb_table
);
6434 ebb
= &ebb_table
.ebb
;
6435 init_ebb (ebb
, sec
, contents
, sec_size
, prop_table
, ptblsize
,
6436 internal_relocs
, sec
->reloc_count
);
6437 ebb
->start_offset
= r_offset
+ simplify_size
;
6438 ebb
->end_offset
= r_offset
+ simplify_size
;
6439 ebb
->start_ptbl_idx
= ptbl_idx
;
6440 ebb
->end_ptbl_idx
= ptbl_idx
;
6441 ebb
->start_reloc_idx
= i
;
6442 ebb
->end_reloc_idx
= i
;
6444 /* Precompute the opcode for each relocation. */
6445 if (reloc_opcodes
== NULL
)
6446 reloc_opcodes
= build_reloc_opcodes (abfd
, sec
, contents
,
6449 if (!extend_ebb_bounds (ebb
)
6450 || !compute_ebb_proposed_actions (&ebb_table
)
6451 || !compute_ebb_actions (&ebb_table
)
6452 || !check_section_ebb_pcrels_fit (abfd
, sec
, contents
,
6453 internal_relocs
, &ebb_table
,
6455 || !check_section_ebb_reduces (&ebb_table
))
6457 /* If anything goes wrong or we get unlucky and something does
6458 not fit, with our plan because of expansion between
6459 critical branches, just convert to a NOP. */
6461 text_action_add (&relax_info
->action_list
,
6462 ta_convert_longcall
, sec
, r_offset
, 0);
6463 i
= ebb_table
.ebb
.end_reloc_idx
;
6464 free_ebb_constraint (&ebb_table
);
6468 text_action_add_proposed (&relax_info
->action_list
, &ebb_table
, sec
);
6470 /* Update the index so we do not go looking at the relocations
6471 we have already processed. */
6472 i
= ebb_table
.ebb
.end_reloc_idx
;
6473 free_ebb_constraint (&ebb_table
);
6477 if (relax_info
->action_list
.head
)
6478 print_action_list (stderr
, &relax_info
->action_list
);
6482 release_contents (sec
, contents
);
6483 release_internal_relocs (sec
, internal_relocs
);
6487 free (reloc_opcodes
);
6493 /* Do not widen an instruction if it is preceeded by a
6494 loop opcode. It might cause misalignment. */
6497 prev_instr_is_a_loop (bfd_byte
*contents
,
6498 bfd_size_type content_length
,
6499 bfd_size_type offset
)
6501 xtensa_opcode prev_opcode
;
6505 prev_opcode
= insn_decode_opcode (contents
, content_length
, offset
-3, 0);
6506 return (xtensa_opcode_is_loop (xtensa_default_isa
, prev_opcode
) == 1);
6510 /* Find all of the possible actions for an extended basic block. */
6513 compute_ebb_proposed_actions (ebb_constraint
*ebb_table
)
6515 const ebb_t
*ebb
= &ebb_table
->ebb
;
6516 unsigned rel_idx
= ebb
->start_reloc_idx
;
6517 property_table_entry
*entry
, *start_entry
, *end_entry
;
6519 xtensa_isa isa
= xtensa_default_isa
;
6521 static xtensa_insnbuf insnbuf
= NULL
;
6522 static xtensa_insnbuf slotbuf
= NULL
;
6524 if (insnbuf
== NULL
)
6526 insnbuf
= xtensa_insnbuf_alloc (isa
);
6527 slotbuf
= xtensa_insnbuf_alloc (isa
);
6530 start_entry
= &ebb
->ptbl
[ebb
->start_ptbl_idx
];
6531 end_entry
= &ebb
->ptbl
[ebb
->end_ptbl_idx
];
6533 for (entry
= start_entry
; entry
<= end_entry
; entry
++)
6535 bfd_vma start_offset
, end_offset
;
6536 bfd_size_type insn_len
;
6538 start_offset
= entry
->address
- ebb
->sec
->vma
;
6539 end_offset
= entry
->address
+ entry
->size
- ebb
->sec
->vma
;
6541 if (entry
== start_entry
)
6542 start_offset
= ebb
->start_offset
;
6543 if (entry
== end_entry
)
6544 end_offset
= ebb
->end_offset
;
6545 offset
= start_offset
;
6547 if (offset
== entry
->address
- ebb
->sec
->vma
6548 && (entry
->flags
& XTENSA_PROP_INSN_BRANCH_TARGET
) != 0)
6550 enum ebb_target_enum align_type
= EBB_DESIRE_TGT_ALIGN
;
6551 BFD_ASSERT (offset
!= end_offset
);
6552 if (offset
== end_offset
)
6555 insn_len
= insn_decode_len (ebb
->contents
, ebb
->content_length
,
6560 if (check_branch_target_aligned_address (offset
, insn_len
))
6561 align_type
= EBB_REQUIRE_TGT_ALIGN
;
6563 ebb_propose_action (ebb_table
, align_type
, 0,
6564 ta_none
, offset
, 0, TRUE
);
6567 while (offset
!= end_offset
)
6569 Elf_Internal_Rela
*irel
;
6570 xtensa_opcode opcode
;
6572 while (rel_idx
< ebb
->end_reloc_idx
6573 && (ebb
->relocs
[rel_idx
].r_offset
< offset
6574 || (ebb
->relocs
[rel_idx
].r_offset
== offset
6575 && (ELF32_R_TYPE (ebb
->relocs
[rel_idx
].r_info
)
6576 != R_XTENSA_ASM_SIMPLIFY
))))
6579 /* Check for longcall. */
6580 irel
= &ebb
->relocs
[rel_idx
];
6581 if (irel
->r_offset
== offset
6582 && ELF32_R_TYPE (irel
->r_info
) == R_XTENSA_ASM_SIMPLIFY
)
6584 bfd_size_type simplify_size
;
6586 simplify_size
= get_asm_simplify_size (ebb
->contents
,
6587 ebb
->content_length
,
6589 if (simplify_size
== 0)
6592 ebb_propose_action (ebb_table
, EBB_NO_ALIGN
, 0,
6593 ta_convert_longcall
, offset
, 0, TRUE
);
6595 offset
+= simplify_size
;
6599 if (offset
+ MIN_INSN_LENGTH
> ebb
->content_length
)
6601 xtensa_insnbuf_from_chars (isa
, insnbuf
, &ebb
->contents
[offset
],
6602 ebb
->content_length
- offset
);
6603 fmt
= xtensa_format_decode (isa
, insnbuf
);
6604 if (fmt
== XTENSA_UNDEFINED
)
6606 insn_len
= xtensa_format_length (isa
, fmt
);
6607 if (insn_len
== (bfd_size_type
) XTENSA_UNDEFINED
)
6610 if (xtensa_format_num_slots (isa
, fmt
) != 1)
6616 xtensa_format_get_slot (isa
, fmt
, 0, insnbuf
, slotbuf
);
6617 opcode
= xtensa_opcode_decode (isa
, fmt
, 0, slotbuf
);
6618 if (opcode
== XTENSA_UNDEFINED
)
6621 if ((entry
->flags
& XTENSA_PROP_INSN_NO_DENSITY
) == 0
6622 && (entry
->flags
& XTENSA_PROP_INSN_NO_TRANSFORM
) == 0
6623 && can_narrow_instruction (slotbuf
, fmt
, opcode
) != 0)
6625 /* Add an instruction narrow action. */
6626 ebb_propose_action (ebb_table
, EBB_NO_ALIGN
, 0,
6627 ta_narrow_insn
, offset
, 0, FALSE
);
6629 else if ((entry
->flags
& XTENSA_PROP_INSN_NO_TRANSFORM
) == 0
6630 && can_widen_instruction (slotbuf
, fmt
, opcode
) != 0
6631 && ! prev_instr_is_a_loop (ebb
->contents
,
6632 ebb
->content_length
, offset
))
6634 /* Add an instruction widen action. */
6635 ebb_propose_action (ebb_table
, EBB_NO_ALIGN
, 0,
6636 ta_widen_insn
, offset
, 0, FALSE
);
6638 else if (xtensa_opcode_is_loop (xtensa_default_isa
, opcode
) == 1)
6640 /* Check for branch targets. */
6641 ebb_propose_action (ebb_table
, EBB_REQUIRE_LOOP_ALIGN
, 0,
6642 ta_none
, offset
, 0, TRUE
);
6649 if (ebb
->ends_unreachable
)
6651 ebb_propose_action (ebb_table
, EBB_NO_ALIGN
, 0,
6652 ta_fill
, ebb
->end_offset
, 0, TRUE
);
6658 (*_bfd_error_handler
)
6659 (_("%B(%A+0x%lx): could not decode instruction; possible configuration mismatch"),
6660 ebb
->sec
->owner
, ebb
->sec
, offset
);
6665 /* After all of the information has collected about the
6666 transformations possible in an EBB, compute the appropriate actions
6667 here in compute_ebb_actions. We still must check later to make
6668 sure that the actions do not break any relocations. The algorithm
6669 used here is pretty greedy. Basically, it removes as many no-ops
6670 as possible so that the end of the EBB has the same alignment
6671 characteristics as the original. First, it uses narrowing, then
6672 fill space at the end of the EBB, and finally widenings. If that
6673 does not work, it tries again with one fewer no-op removed. The
6674 optimization will only be performed if all of the branch targets
6675 that were aligned before transformation are also aligned after the
6678 When the size_opt flag is set, ignore the branch target alignments,
6679 narrow all wide instructions, and remove all no-ops unless the end
6680 of the EBB prevents it. */
6683 compute_ebb_actions (ebb_constraint
*ebb_table
)
6687 int removed_bytes
= 0;
6688 ebb_t
*ebb
= &ebb_table
->ebb
;
6689 unsigned seg_idx_start
= 0;
6690 unsigned seg_idx_end
= 0;
6692 /* We perform this like the assembler relaxation algorithm: Start by
6693 assuming all instructions are narrow and all no-ops removed; then
6696 /* For each segment of this that has a solid constraint, check to
6697 see if there are any combinations that will keep the constraint.
6699 for (seg_idx_end
= 0; seg_idx_end
< ebb_table
->action_count
; seg_idx_end
++)
6701 bfd_boolean requires_text_end_align
= FALSE
;
6702 unsigned longcall_count
= 0;
6703 unsigned longcall_convert_count
= 0;
6704 unsigned narrowable_count
= 0;
6705 unsigned narrowable_convert_count
= 0;
6706 unsigned widenable_count
= 0;
6707 unsigned widenable_convert_count
= 0;
6709 proposed_action
*action
= NULL
;
6710 int align
= (1 << ebb_table
->ebb
.sec
->alignment_power
);
6712 seg_idx_start
= seg_idx_end
;
6714 for (i
= seg_idx_start
; i
< ebb_table
->action_count
; i
++)
6716 action
= &ebb_table
->actions
[i
];
6717 if (action
->action
== ta_convert_longcall
)
6719 if (action
->action
== ta_narrow_insn
)
6721 if (action
->action
== ta_widen_insn
)
6723 if (action
->action
== ta_fill
)
6725 if (action
->align_type
== EBB_REQUIRE_LOOP_ALIGN
)
6727 if (action
->align_type
== EBB_REQUIRE_TGT_ALIGN
6728 && !elf32xtensa_size_opt
)
6733 if (seg_idx_end
== ebb_table
->action_count
&& !ebb
->ends_unreachable
)
6734 requires_text_end_align
= TRUE
;
6736 if (elf32xtensa_size_opt
&& !requires_text_end_align
6737 && action
->align_type
!= EBB_REQUIRE_LOOP_ALIGN
6738 && action
->align_type
!= EBB_REQUIRE_TGT_ALIGN
)
6740 longcall_convert_count
= longcall_count
;
6741 narrowable_convert_count
= narrowable_count
;
6742 widenable_convert_count
= 0;
6746 /* There is a constraint. Convert the max number of longcalls. */
6747 narrowable_convert_count
= 0;
6748 longcall_convert_count
= 0;
6749 widenable_convert_count
= 0;
6751 for (j
= 0; j
< longcall_count
; j
++)
6753 int removed
= (longcall_count
- j
) * 3 & (align
- 1);
6754 unsigned desire_narrow
= (align
- removed
) & (align
- 1);
6755 unsigned desire_widen
= removed
;
6756 if (desire_narrow
<= narrowable_count
)
6758 narrowable_convert_count
= desire_narrow
;
6759 narrowable_convert_count
+=
6760 (align
* ((narrowable_count
- narrowable_convert_count
)
6762 longcall_convert_count
= (longcall_count
- j
);
6763 widenable_convert_count
= 0;
6766 if (desire_widen
<= widenable_count
&& !elf32xtensa_size_opt
)
6768 narrowable_convert_count
= 0;
6769 longcall_convert_count
= longcall_count
- j
;
6770 widenable_convert_count
= desire_widen
;
6776 /* Now the number of conversions are saved. Do them. */
6777 for (i
= seg_idx_start
; i
< seg_idx_end
; i
++)
6779 action
= &ebb_table
->actions
[i
];
6780 switch (action
->action
)
6782 case ta_convert_longcall
:
6783 if (longcall_convert_count
!= 0)
6785 action
->action
= ta_remove_longcall
;
6786 action
->do_action
= TRUE
;
6787 action
->removed_bytes
+= 3;
6788 longcall_convert_count
--;
6791 case ta_narrow_insn
:
6792 if (narrowable_convert_count
!= 0)
6794 action
->do_action
= TRUE
;
6795 action
->removed_bytes
+= 1;
6796 narrowable_convert_count
--;
6800 if (widenable_convert_count
!= 0)
6802 action
->do_action
= TRUE
;
6803 action
->removed_bytes
-= 1;
6804 widenable_convert_count
--;
6813 /* Now we move on to some local opts. Try to remove each of the
6814 remaining longcalls. */
6816 if (ebb_table
->ebb
.ends_section
|| ebb_table
->ebb
.ends_unreachable
)
6819 for (i
= 0; i
< ebb_table
->action_count
; i
++)
6821 int old_removed_bytes
= removed_bytes
;
6822 proposed_action
*action
= &ebb_table
->actions
[i
];
6824 if (action
->do_action
&& action
->action
== ta_convert_longcall
)
6826 bfd_boolean bad_alignment
= FALSE
;
6828 for (j
= i
+ 1; j
< ebb_table
->action_count
; j
++)
6830 proposed_action
*new_action
= &ebb_table
->actions
[j
];
6831 bfd_vma offset
= new_action
->offset
;
6832 if (new_action
->align_type
== EBB_REQUIRE_TGT_ALIGN
)
6834 if (!check_branch_target_aligned
6835 (ebb_table
->ebb
.contents
,
6836 ebb_table
->ebb
.content_length
,
6837 offset
, offset
- removed_bytes
))
6839 bad_alignment
= TRUE
;
6843 if (new_action
->align_type
== EBB_REQUIRE_LOOP_ALIGN
)
6845 if (!check_loop_aligned (ebb_table
->ebb
.contents
,
6846 ebb_table
->ebb
.content_length
,
6848 offset
- removed_bytes
))
6850 bad_alignment
= TRUE
;
6854 if (new_action
->action
== ta_narrow_insn
6855 && !new_action
->do_action
6856 && ebb_table
->ebb
.sec
->alignment_power
== 2)
6858 /* Narrow an instruction and we are done. */
6859 new_action
->do_action
= TRUE
;
6860 new_action
->removed_bytes
+= 1;
6861 bad_alignment
= FALSE
;
6864 if (new_action
->action
== ta_widen_insn
6865 && new_action
->do_action
6866 && ebb_table
->ebb
.sec
->alignment_power
== 2)
6868 /* Narrow an instruction and we are done. */
6869 new_action
->do_action
= FALSE
;
6870 new_action
->removed_bytes
+= 1;
6871 bad_alignment
= FALSE
;
6877 action
->removed_bytes
+= 3;
6878 action
->action
= ta_remove_longcall
;
6879 action
->do_action
= TRUE
;
6882 removed_bytes
= old_removed_bytes
;
6883 if (action
->do_action
)
6884 removed_bytes
+= action
->removed_bytes
;
6889 for (i
= 0; i
< ebb_table
->action_count
; ++i
)
6891 proposed_action
*action
= &ebb_table
->actions
[i
];
6892 if (action
->do_action
)
6893 removed_bytes
+= action
->removed_bytes
;
6896 if ((removed_bytes
% (1 << ebb_table
->ebb
.sec
->alignment_power
)) != 0
6897 && ebb
->ends_unreachable
)
6899 proposed_action
*action
;
6903 BFD_ASSERT (ebb_table
->action_count
!= 0);
6904 action
= &ebb_table
->actions
[ebb_table
->action_count
- 1];
6905 BFD_ASSERT (action
->action
== ta_fill
);
6906 BFD_ASSERT (ebb
->ends_unreachable
->flags
& XTENSA_PROP_UNREACHABLE
);
6908 extra_space
= compute_fill_extra_space (ebb
->ends_unreachable
);
6909 br
= action
->removed_bytes
+ removed_bytes
+ extra_space
;
6910 br
= br
& ((1 << ebb
->sec
->alignment_power
) - 1);
6912 action
->removed_bytes
= extra_space
- br
;
6918 /* The xlate_map is a sorted array of address mappings designed to
6919 answer the offset_with_removed_text() query with a binary search instead
6920 of a linear search through the section's action_list. */
6922 typedef struct xlate_map_entry xlate_map_entry_t
;
6923 typedef struct xlate_map xlate_map_t
;
6925 struct xlate_map_entry
6927 unsigned orig_address
;
6928 unsigned new_address
;
6934 unsigned entry_count
;
6935 xlate_map_entry_t
*entry
;
6940 xlate_compare (const void *a_v
, const void *b_v
)
6942 const xlate_map_entry_t
*a
= (const xlate_map_entry_t
*) a_v
;
6943 const xlate_map_entry_t
*b
= (const xlate_map_entry_t
*) b_v
;
6944 if (a
->orig_address
< b
->orig_address
)
6946 if (a
->orig_address
> (b
->orig_address
+ b
->size
- 1))
6953 xlate_offset_with_removed_text (const xlate_map_t
*map
,
6954 text_action_list
*action_list
,
6957 xlate_map_entry_t tmp
;
6959 xlate_map_entry_t
*e
;
6962 return offset_with_removed_text (action_list
, offset
);
6964 if (map
->entry_count
== 0)
6967 tmp
.orig_address
= offset
;
6968 tmp
.new_address
= offset
;
6971 r
= bsearch (&offset
, map
->entry
, map
->entry_count
,
6972 sizeof (xlate_map_entry_t
), &xlate_compare
);
6973 e
= (xlate_map_entry_t
*) r
;
6975 BFD_ASSERT (e
!= NULL
);
6978 return e
->new_address
- e
->orig_address
+ offset
;
6982 /* Build a binary searchable offset translation map from a section's
6985 static xlate_map_t
*
6986 build_xlate_map (asection
*sec
, xtensa_relax_info
*relax_info
)
6988 xlate_map_t
*map
= (xlate_map_t
*) bfd_malloc (sizeof (xlate_map_t
));
6989 text_action_list
*action_list
= &relax_info
->action_list
;
6990 unsigned num_actions
= 0;
6993 xlate_map_entry_t
*current_entry
;
6998 num_actions
= action_list_count (action_list
);
6999 map
->entry
= (xlate_map_entry_t
*)
7000 bfd_malloc (sizeof (xlate_map_entry_t
) * (num_actions
+ 1));
7001 if (map
->entry
== NULL
)
7006 map
->entry_count
= 0;
7009 current_entry
= &map
->entry
[0];
7011 current_entry
->orig_address
= 0;
7012 current_entry
->new_address
= 0;
7013 current_entry
->size
= 0;
7015 for (r
= action_list
->head
; r
!= NULL
; r
= r
->next
)
7017 unsigned orig_size
= 0;
7021 case ta_remove_insn
:
7022 case ta_convert_longcall
:
7023 case ta_remove_literal
:
7024 case ta_add_literal
:
7026 case ta_remove_longcall
:
7029 case ta_narrow_insn
:
7038 current_entry
->size
=
7039 r
->offset
+ orig_size
- current_entry
->orig_address
;
7040 if (current_entry
->size
!= 0)
7045 current_entry
->orig_address
= r
->offset
+ orig_size
;
7046 removed
+= r
->removed_bytes
;
7047 current_entry
->new_address
= r
->offset
+ orig_size
- removed
;
7048 current_entry
->size
= 0;
7051 current_entry
->size
= (bfd_get_section_limit (sec
->owner
, sec
)
7052 - current_entry
->orig_address
);
7053 if (current_entry
->size
!= 0)
7060 /* Free an offset translation map. */
7063 free_xlate_map (xlate_map_t
*map
)
7065 if (map
&& map
->entry
)
7072 /* Use check_section_ebb_pcrels_fit to make sure that all of the
7073 relocations in a section will fit if a proposed set of actions
7077 check_section_ebb_pcrels_fit (bfd
*abfd
,
7080 Elf_Internal_Rela
*internal_relocs
,
7081 const ebb_constraint
*constraint
,
7082 const xtensa_opcode
*reloc_opcodes
)
7085 Elf_Internal_Rela
*irel
;
7086 xlate_map_t
*xmap
= NULL
;
7087 bfd_boolean ok
= TRUE
;
7088 xtensa_relax_info
*relax_info
;
7090 relax_info
= get_xtensa_relax_info (sec
);
7092 if (relax_info
&& sec
->reloc_count
> 100)
7094 xmap
= build_xlate_map (sec
, relax_info
);
7095 /* NULL indicates out of memory, but the slow version
7096 can still be used. */
7099 for (i
= 0; i
< sec
->reloc_count
; i
++)
7102 bfd_vma orig_self_offset
, orig_target_offset
;
7103 bfd_vma self_offset
, target_offset
;
7105 reloc_howto_type
*howto
;
7106 int self_removed_bytes
, target_removed_bytes
;
7108 irel
= &internal_relocs
[i
];
7109 r_type
= ELF32_R_TYPE (irel
->r_info
);
7111 howto
= &elf_howto_table
[r_type
];
7112 /* We maintain the required invariant: PC-relative relocations
7113 that fit before linking must fit after linking. Thus we only
7114 need to deal with relocations to the same section that are
7116 if (ELF32_R_TYPE (irel
->r_info
) == R_XTENSA_ASM_SIMPLIFY
7117 || !howto
->pc_relative
)
7120 r_reloc_init (&r_rel
, abfd
, irel
, contents
,
7121 bfd_get_section_limit (abfd
, sec
));
7123 if (r_reloc_get_section (&r_rel
) != sec
)
7126 orig_self_offset
= irel
->r_offset
;
7127 orig_target_offset
= r_rel
.target_offset
;
7129 self_offset
= orig_self_offset
;
7130 target_offset
= orig_target_offset
;
7135 xlate_offset_with_removed_text (xmap
, &relax_info
->action_list
,
7138 xlate_offset_with_removed_text (xmap
, &relax_info
->action_list
,
7139 orig_target_offset
);
7142 self_removed_bytes
= 0;
7143 target_removed_bytes
= 0;
7145 for (j
= 0; j
< constraint
->action_count
; ++j
)
7147 proposed_action
*action
= &constraint
->actions
[j
];
7148 bfd_vma offset
= action
->offset
;
7149 int removed_bytes
= action
->removed_bytes
;
7150 if (offset
< orig_self_offset
7151 || (offset
== orig_self_offset
&& action
->action
== ta_fill
7152 && action
->removed_bytes
< 0))
7153 self_removed_bytes
+= removed_bytes
;
7154 if (offset
< orig_target_offset
7155 || (offset
== orig_target_offset
&& action
->action
== ta_fill
7156 && action
->removed_bytes
< 0))
7157 target_removed_bytes
+= removed_bytes
;
7159 self_offset
-= self_removed_bytes
;
7160 target_offset
-= target_removed_bytes
;
7162 /* Try to encode it. Get the operand and check. */
7163 if (is_alt_relocation (ELF32_R_TYPE (irel
->r_info
)))
7165 /* None of the current alternate relocs are PC-relative,
7166 and only PC-relative relocs matter here. */
7170 xtensa_opcode opcode
;
7174 opcode
= reloc_opcodes
[i
];
7176 opcode
= get_relocation_opcode (abfd
, sec
, contents
, irel
);
7177 if (opcode
== XTENSA_UNDEFINED
)
7183 opnum
= get_relocation_opnd (opcode
, ELF32_R_TYPE (irel
->r_info
));
7184 if (opnum
== XTENSA_UNDEFINED
)
7190 if (!pcrel_reloc_fits (opcode
, opnum
, self_offset
, target_offset
))
7199 free_xlate_map (xmap
);
7206 check_section_ebb_reduces (const ebb_constraint
*constraint
)
7211 for (i
= 0; i
< constraint
->action_count
; i
++)
7213 const proposed_action
*action
= &constraint
->actions
[i
];
7214 if (action
->do_action
)
7215 removed
+= action
->removed_bytes
;
7225 text_action_add_proposed (text_action_list
*l
,
7226 const ebb_constraint
*ebb_table
,
7231 for (i
= 0; i
< ebb_table
->action_count
; i
++)
7233 proposed_action
*action
= &ebb_table
->actions
[i
];
7235 if (!action
->do_action
)
7237 switch (action
->action
)
7239 case ta_remove_insn
:
7240 case ta_remove_longcall
:
7241 case ta_convert_longcall
:
7242 case ta_narrow_insn
:
7245 case ta_remove_literal
:
7246 text_action_add (l
, action
->action
, sec
, action
->offset
,
7247 action
->removed_bytes
);
7260 compute_fill_extra_space (property_table_entry
*entry
)
7262 int fill_extra_space
;
7267 if ((entry
->flags
& XTENSA_PROP_UNREACHABLE
) == 0)
7270 fill_extra_space
= entry
->size
;
7271 if ((entry
->flags
& XTENSA_PROP_ALIGN
) != 0)
7273 /* Fill bytes for alignment:
7274 (2**n)-1 - (addr + (2**n)-1) & (2**n -1) */
7275 int pow
= GET_XTENSA_PROP_ALIGNMENT (entry
->flags
);
7276 int nsm
= (1 << pow
) - 1;
7277 bfd_vma addr
= entry
->address
+ entry
->size
;
7278 bfd_vma align_fill
= nsm
- ((addr
+ nsm
) & nsm
);
7279 fill_extra_space
+= align_fill
;
7281 return fill_extra_space
;
7285 /* First relaxation pass. */
7287 /* If the section contains relaxable literals, check each literal to
7288 see if it has the same value as another literal that has already
7289 been seen, either in the current section or a previous one. If so,
7290 add an entry to the per-section list of removed literals. The
7291 actual changes are deferred until the next pass. */
7294 compute_removed_literals (bfd
*abfd
,
7296 struct bfd_link_info
*link_info
,
7297 value_map_hash_table
*values
)
7299 xtensa_relax_info
*relax_info
;
7301 Elf_Internal_Rela
*internal_relocs
;
7302 source_reloc
*src_relocs
, *rel
;
7303 bfd_boolean ok
= TRUE
;
7304 property_table_entry
*prop_table
= NULL
;
7307 bfd_boolean last_loc_is_prev
= FALSE
;
7308 bfd_vma last_target_offset
= 0;
7309 section_cache_t target_sec_cache
;
7310 bfd_size_type sec_size
;
7312 init_section_cache (&target_sec_cache
);
7314 /* Do nothing if it is not a relaxable literal section. */
7315 relax_info
= get_xtensa_relax_info (sec
);
7316 BFD_ASSERT (relax_info
);
7317 if (!relax_info
->is_relaxable_literal_section
)
7320 internal_relocs
= retrieve_internal_relocs (abfd
, sec
,
7321 link_info
->keep_memory
);
7323 sec_size
= bfd_get_section_limit (abfd
, sec
);
7324 contents
= retrieve_contents (abfd
, sec
, link_info
->keep_memory
);
7325 if (contents
== NULL
&& sec_size
!= 0)
7331 /* Sort the source_relocs by target offset. */
7332 src_relocs
= relax_info
->src_relocs
;
7333 qsort (src_relocs
, relax_info
->src_count
,
7334 sizeof (source_reloc
), source_reloc_compare
);
7335 qsort (internal_relocs
, sec
->reloc_count
, sizeof (Elf_Internal_Rela
),
7336 internal_reloc_compare
);
7338 ptblsize
= xtensa_read_table_entries (abfd
, sec
, &prop_table
,
7339 XTENSA_PROP_SEC_NAME
, FALSE
);
7347 for (i
= 0; i
< relax_info
->src_count
; i
++)
7349 Elf_Internal_Rela
*irel
= NULL
;
7351 rel
= &src_relocs
[i
];
7352 if (get_l32r_opcode () != rel
->opcode
)
7354 irel
= get_irel_at_offset (sec
, internal_relocs
,
7355 rel
->r_rel
.target_offset
);
7357 /* If the relocation on this is not a simple R_XTENSA_32 or
7358 R_XTENSA_PLT then do not consider it. This may happen when
7359 the difference of two symbols is used in a literal. */
7360 if (irel
&& (ELF32_R_TYPE (irel
->r_info
) != R_XTENSA_32
7361 && ELF32_R_TYPE (irel
->r_info
) != R_XTENSA_PLT
))
7364 /* If the target_offset for this relocation is the same as the
7365 previous relocation, then we've already considered whether the
7366 literal can be coalesced. Skip to the next one.... */
7367 if (i
!= 0 && prev_i
!= -1
7368 && src_relocs
[i
-1].r_rel
.target_offset
== rel
->r_rel
.target_offset
)
7372 if (last_loc_is_prev
&&
7373 last_target_offset
+ 4 != rel
->r_rel
.target_offset
)
7374 last_loc_is_prev
= FALSE
;
7376 /* Check if the relocation was from an L32R that is being removed
7377 because a CALLX was converted to a direct CALL, and check if
7378 there are no other relocations to the literal. */
7379 if (is_removable_literal (rel
, i
, src_relocs
, relax_info
->src_count
))
7381 if (!remove_dead_literal (abfd
, sec
, link_info
, internal_relocs
,
7382 irel
, rel
, prop_table
, ptblsize
))
7387 last_target_offset
= rel
->r_rel
.target_offset
;
7391 if (!identify_literal_placement (abfd
, sec
, contents
, link_info
,
7393 &last_loc_is_prev
, irel
,
7394 relax_info
->src_count
- i
, rel
,
7395 prop_table
, ptblsize
,
7396 &target_sec_cache
, rel
->is_abs_literal
))
7401 last_target_offset
= rel
->r_rel
.target_offset
;
7405 print_removed_literals (stderr
, &relax_info
->removed_list
);
7406 print_action_list (stderr
, &relax_info
->action_list
);
7410 if (prop_table
) free (prop_table
);
7411 clear_section_cache (&target_sec_cache
);
7413 release_contents (sec
, contents
);
7414 release_internal_relocs (sec
, internal_relocs
);
7419 static Elf_Internal_Rela
*
7420 get_irel_at_offset (asection
*sec
,
7421 Elf_Internal_Rela
*internal_relocs
,
7425 Elf_Internal_Rela
*irel
;
7427 Elf_Internal_Rela key
;
7429 if (!internal_relocs
)
7432 key
.r_offset
= offset
;
7433 irel
= bsearch (&key
, internal_relocs
, sec
->reloc_count
,
7434 sizeof (Elf_Internal_Rela
), internal_reloc_matches
);
7438 /* bsearch does not guarantee which will be returned if there are
7439 multiple matches. We need the first that is not an alignment. */
7440 i
= irel
- internal_relocs
;
7443 if (internal_relocs
[i
-1].r_offset
!= offset
)
7447 for ( ; i
< sec
->reloc_count
; i
++)
7449 irel
= &internal_relocs
[i
];
7450 r_type
= ELF32_R_TYPE (irel
->r_info
);
7451 if (irel
->r_offset
== offset
&& r_type
!= R_XTENSA_NONE
)
7460 is_removable_literal (const source_reloc
*rel
,
7462 const source_reloc
*src_relocs
,
7465 const source_reloc
*curr_rel
;
7469 for (++i
; i
< src_count
; ++i
)
7471 curr_rel
= &src_relocs
[i
];
7472 /* If all others have the same target offset.... */
7473 if (curr_rel
->r_rel
.target_offset
!= rel
->r_rel
.target_offset
)
7476 if (!curr_rel
->is_null
7477 && !xtensa_is_property_section (curr_rel
->source_sec
)
7478 && !(curr_rel
->source_sec
->flags
& SEC_DEBUGGING
))
7486 remove_dead_literal (bfd
*abfd
,
7488 struct bfd_link_info
*link_info
,
7489 Elf_Internal_Rela
*internal_relocs
,
7490 Elf_Internal_Rela
*irel
,
7492 property_table_entry
*prop_table
,
7495 property_table_entry
*entry
;
7496 xtensa_relax_info
*relax_info
;
7498 relax_info
= get_xtensa_relax_info (sec
);
7502 entry
= elf_xtensa_find_property_entry (prop_table
, ptblsize
,
7503 sec
->vma
+ rel
->r_rel
.target_offset
);
7505 /* Mark the unused literal so that it will be removed. */
7506 add_removed_literal (&relax_info
->removed_list
, &rel
->r_rel
, NULL
);
7508 text_action_add (&relax_info
->action_list
,
7509 ta_remove_literal
, sec
, rel
->r_rel
.target_offset
, 4);
7511 /* If the section is 4-byte aligned, do not add fill. */
7512 if (sec
->alignment_power
> 2)
7514 int fill_extra_space
;
7515 bfd_vma entry_sec_offset
;
7517 property_table_entry
*the_add_entry
;
7521 entry_sec_offset
= entry
->address
- sec
->vma
+ entry
->size
;
7523 entry_sec_offset
= rel
->r_rel
.target_offset
+ 4;
7525 /* If the literal range is at the end of the section,
7527 the_add_entry
= elf_xtensa_find_property_entry (prop_table
, ptblsize
,
7529 fill_extra_space
= compute_fill_extra_space (the_add_entry
);
7531 fa
= find_fill_action (&relax_info
->action_list
, sec
, entry_sec_offset
);
7532 removed_diff
= compute_removed_action_diff (fa
, sec
, entry_sec_offset
,
7533 -4, fill_extra_space
);
7535 adjust_fill_action (fa
, removed_diff
);
7537 text_action_add (&relax_info
->action_list
,
7538 ta_fill
, sec
, entry_sec_offset
, removed_diff
);
7541 /* Zero out the relocation on this literal location. */
7544 if (elf_hash_table (link_info
)->dynamic_sections_created
)
7545 shrink_dynamic_reloc_sections (link_info
, abfd
, sec
, irel
);
7547 irel
->r_info
= ELF32_R_INFO (0, R_XTENSA_NONE
);
7548 pin_internal_relocs (sec
, internal_relocs
);
7551 /* Do not modify "last_loc_is_prev". */
7557 identify_literal_placement (bfd
*abfd
,
7560 struct bfd_link_info
*link_info
,
7561 value_map_hash_table
*values
,
7562 bfd_boolean
*last_loc_is_prev_p
,
7563 Elf_Internal_Rela
*irel
,
7564 int remaining_src_rels
,
7566 property_table_entry
*prop_table
,
7568 section_cache_t
*target_sec_cache
,
7569 bfd_boolean is_abs_literal
)
7573 xtensa_relax_info
*relax_info
;
7574 bfd_boolean literal_placed
= FALSE
;
7576 unsigned long value
;
7577 bfd_boolean final_static_link
;
7578 bfd_size_type sec_size
;
7580 relax_info
= get_xtensa_relax_info (sec
);
7584 sec_size
= bfd_get_section_limit (abfd
, sec
);
7587 (!link_info
->relocatable
7588 && !elf_hash_table (link_info
)->dynamic_sections_created
);
7590 /* The placement algorithm first checks to see if the literal is
7591 already in the value map. If so and the value map is reachable
7592 from all uses, then the literal is moved to that location. If
7593 not, then we identify the last location where a fresh literal was
7594 placed. If the literal can be safely moved there, then we do so.
7595 If not, then we assume that the literal is not to move and leave
7596 the literal where it is, marking it as the last literal
7599 /* Find the literal value. */
7601 r_reloc_init (&r_rel
, abfd
, irel
, contents
, sec_size
);
7604 BFD_ASSERT (rel
->r_rel
.target_offset
< sec_size
);
7605 value
= bfd_get_32 (abfd
, contents
+ rel
->r_rel
.target_offset
);
7607 init_literal_value (&val
, &r_rel
, value
, is_abs_literal
);
7609 /* Check if we've seen another literal with the same value that
7610 is in the same output section. */
7611 val_map
= value_map_get_cached_value (values
, &val
, final_static_link
);
7614 && (r_reloc_get_section (&val_map
->loc
)->output_section
7615 == sec
->output_section
)
7616 && relocations_reach (rel
, remaining_src_rels
, &val_map
->loc
)
7617 && coalesce_shared_literal (sec
, rel
, prop_table
, ptblsize
, val_map
))
7619 /* No change to last_loc_is_prev. */
7620 literal_placed
= TRUE
;
7623 /* For relocatable links, do not try to move literals. To do it
7624 correctly might increase the number of relocations in an input
7625 section making the default relocatable linking fail. */
7626 if (!link_info
->relocatable
&& !literal_placed
7627 && values
->has_last_loc
&& !(*last_loc_is_prev_p
))
7629 asection
*target_sec
= r_reloc_get_section (&values
->last_loc
);
7630 if (target_sec
&& target_sec
->output_section
== sec
->output_section
)
7632 /* Increment the virtual offset. */
7633 r_reloc try_loc
= values
->last_loc
;
7634 try_loc
.virtual_offset
+= 4;
7636 /* There is a last loc that was in the same output section. */
7637 if (relocations_reach (rel
, remaining_src_rels
, &try_loc
)
7638 && move_shared_literal (sec
, link_info
, rel
,
7639 prop_table
, ptblsize
,
7640 &try_loc
, &val
, target_sec_cache
))
7642 values
->last_loc
.virtual_offset
+= 4;
7643 literal_placed
= TRUE
;
7645 val_map
= add_value_map (values
, &val
, &try_loc
,
7648 val_map
->loc
= try_loc
;
7653 if (!literal_placed
)
7655 /* Nothing worked, leave the literal alone but update the last loc. */
7656 values
->has_last_loc
= TRUE
;
7657 values
->last_loc
= rel
->r_rel
;
7659 val_map
= add_value_map (values
, &val
, &rel
->r_rel
, final_static_link
);
7661 val_map
->loc
= rel
->r_rel
;
7662 *last_loc_is_prev_p
= TRUE
;
7669 /* Check if the original relocations (presumably on L32R instructions)
7670 identified by reloc[0..N] can be changed to reference the literal
7671 identified by r_rel. If r_rel is out of range for any of the
7672 original relocations, then we don't want to coalesce the original
7673 literal with the one at r_rel. We only check reloc[0..N], where the
7674 offsets are all the same as for reloc[0] (i.e., they're all
7675 referencing the same literal) and where N is also bounded by the
7676 number of remaining entries in the "reloc" array. The "reloc" array
7677 is sorted by target offset so we know all the entries for the same
7678 literal will be contiguous. */
7681 relocations_reach (source_reloc
*reloc
,
7682 int remaining_relocs
,
7683 const r_reloc
*r_rel
)
7685 bfd_vma from_offset
, source_address
, dest_address
;
7689 if (!r_reloc_is_defined (r_rel
))
7692 sec
= r_reloc_get_section (r_rel
);
7693 from_offset
= reloc
[0].r_rel
.target_offset
;
7695 for (i
= 0; i
< remaining_relocs
; i
++)
7697 if (reloc
[i
].r_rel
.target_offset
!= from_offset
)
7700 /* Ignore relocations that have been removed. */
7701 if (reloc
[i
].is_null
)
7704 /* The original and new output section for these must be the same
7705 in order to coalesce. */
7706 if (r_reloc_get_section (&reloc
[i
].r_rel
)->output_section
7707 != sec
->output_section
)
7710 /* Absolute literals in the same output section can always be
7712 if (reloc
[i
].is_abs_literal
)
7715 /* A literal with no PC-relative relocations can be moved anywhere. */
7716 if (reloc
[i
].opnd
!= -1)
7718 /* Otherwise, check to see that it fits. */
7719 source_address
= (reloc
[i
].source_sec
->output_section
->vma
7720 + reloc
[i
].source_sec
->output_offset
7721 + reloc
[i
].r_rel
.rela
.r_offset
);
7722 dest_address
= (sec
->output_section
->vma
7723 + sec
->output_offset
7724 + r_rel
->target_offset
);
7726 if (!pcrel_reloc_fits (reloc
[i
].opcode
, reloc
[i
].opnd
,
7727 source_address
, dest_address
))
7736 /* Move a literal to another literal location because it is
7737 the same as the other literal value. */
7740 coalesce_shared_literal (asection
*sec
,
7742 property_table_entry
*prop_table
,
7746 property_table_entry
*entry
;
7748 property_table_entry
*the_add_entry
;
7750 xtensa_relax_info
*relax_info
;
7752 relax_info
= get_xtensa_relax_info (sec
);
7756 entry
= elf_xtensa_find_property_entry
7757 (prop_table
, ptblsize
, sec
->vma
+ rel
->r_rel
.target_offset
);
7758 if (entry
&& (entry
->flags
& XTENSA_PROP_INSN_NO_TRANSFORM
))
7761 /* Mark that the literal will be coalesced. */
7762 add_removed_literal (&relax_info
->removed_list
, &rel
->r_rel
, &val_map
->loc
);
7764 text_action_add (&relax_info
->action_list
,
7765 ta_remove_literal
, sec
, rel
->r_rel
.target_offset
, 4);
7767 /* If the section is 4-byte aligned, do not add fill. */
7768 if (sec
->alignment_power
> 2)
7770 int fill_extra_space
;
7771 bfd_vma entry_sec_offset
;
7774 entry_sec_offset
= entry
->address
- sec
->vma
+ entry
->size
;
7776 entry_sec_offset
= rel
->r_rel
.target_offset
+ 4;
7778 /* If the literal range is at the end of the section,
7780 fill_extra_space
= 0;
7781 the_add_entry
= elf_xtensa_find_property_entry (prop_table
, ptblsize
,
7783 if (the_add_entry
&& (the_add_entry
->flags
& XTENSA_PROP_UNREACHABLE
))
7784 fill_extra_space
= the_add_entry
->size
;
7786 fa
= find_fill_action (&relax_info
->action_list
, sec
, entry_sec_offset
);
7787 removed_diff
= compute_removed_action_diff (fa
, sec
, entry_sec_offset
,
7788 -4, fill_extra_space
);
7790 adjust_fill_action (fa
, removed_diff
);
7792 text_action_add (&relax_info
->action_list
,
7793 ta_fill
, sec
, entry_sec_offset
, removed_diff
);
7800 /* Move a literal to another location. This may actually increase the
7801 total amount of space used because of alignments so we need to do
7802 this carefully. Also, it may make a branch go out of range. */
7805 move_shared_literal (asection
*sec
,
7806 struct bfd_link_info
*link_info
,
7808 property_table_entry
*prop_table
,
7810 const r_reloc
*target_loc
,
7811 const literal_value
*lit_value
,
7812 section_cache_t
*target_sec_cache
)
7814 property_table_entry
*the_add_entry
, *src_entry
, *target_entry
= NULL
;
7815 text_action
*fa
, *target_fa
;
7817 xtensa_relax_info
*relax_info
, *target_relax_info
;
7818 asection
*target_sec
;
7820 ebb_constraint ebb_table
;
7821 bfd_boolean relocs_fit
;
7823 /* If this routine always returns FALSE, the literals that cannot be
7824 coalesced will not be moved. */
7825 if (elf32xtensa_no_literal_movement
)
7828 relax_info
= get_xtensa_relax_info (sec
);
7832 target_sec
= r_reloc_get_section (target_loc
);
7833 target_relax_info
= get_xtensa_relax_info (target_sec
);
7835 /* Literals to undefined sections may not be moved because they
7836 must report an error. */
7837 if (bfd_is_und_section (target_sec
))
7840 src_entry
= elf_xtensa_find_property_entry
7841 (prop_table
, ptblsize
, sec
->vma
+ rel
->r_rel
.target_offset
);
7843 if (!section_cache_section (target_sec_cache
, target_sec
, link_info
))
7846 target_entry
= elf_xtensa_find_property_entry
7847 (target_sec_cache
->ptbl
, target_sec_cache
->pte_count
,
7848 target_sec
->vma
+ target_loc
->target_offset
);
7853 /* Make sure that we have not broken any branches. */
7856 init_ebb_constraint (&ebb_table
);
7857 ebb
= &ebb_table
.ebb
;
7858 init_ebb (ebb
, target_sec_cache
->sec
, target_sec_cache
->contents
,
7859 target_sec_cache
->content_length
,
7860 target_sec_cache
->ptbl
, target_sec_cache
->pte_count
,
7861 target_sec_cache
->relocs
, target_sec_cache
->reloc_count
);
7863 /* Propose to add 4 bytes + worst-case alignment size increase to
7865 ebb_propose_action (&ebb_table
, EBB_NO_ALIGN
, 0,
7866 ta_fill
, target_loc
->target_offset
,
7867 -4 - (1 << target_sec
->alignment_power
), TRUE
);
7869 /* Check all of the PC-relative relocations to make sure they still fit. */
7870 relocs_fit
= check_section_ebb_pcrels_fit (target_sec
->owner
, target_sec
,
7871 target_sec_cache
->contents
,
7872 target_sec_cache
->relocs
,
7878 text_action_add_literal (&target_relax_info
->action_list
,
7879 ta_add_literal
, target_loc
, lit_value
, -4);
7881 if (target_sec
->alignment_power
> 2 && target_entry
!= src_entry
)
7883 /* May need to add or remove some fill to maintain alignment. */
7884 int fill_extra_space
;
7885 bfd_vma entry_sec_offset
;
7888 target_entry
->address
- target_sec
->vma
+ target_entry
->size
;
7890 /* If the literal range is at the end of the section,
7892 fill_extra_space
= 0;
7894 elf_xtensa_find_property_entry (target_sec_cache
->ptbl
,
7895 target_sec_cache
->pte_count
,
7897 if (the_add_entry
&& (the_add_entry
->flags
& XTENSA_PROP_UNREACHABLE
))
7898 fill_extra_space
= the_add_entry
->size
;
7900 target_fa
= find_fill_action (&target_relax_info
->action_list
,
7901 target_sec
, entry_sec_offset
);
7902 removed_diff
= compute_removed_action_diff (target_fa
, target_sec
,
7903 entry_sec_offset
, 4,
7906 adjust_fill_action (target_fa
, removed_diff
);
7908 text_action_add (&target_relax_info
->action_list
,
7909 ta_fill
, target_sec
, entry_sec_offset
, removed_diff
);
7912 /* Mark that the literal will be moved to the new location. */
7913 add_removed_literal (&relax_info
->removed_list
, &rel
->r_rel
, target_loc
);
7915 /* Remove the literal. */
7916 text_action_add (&relax_info
->action_list
,
7917 ta_remove_literal
, sec
, rel
->r_rel
.target_offset
, 4);
7919 /* If the section is 4-byte aligned, do not add fill. */
7920 if (sec
->alignment_power
> 2 && target_entry
!= src_entry
)
7922 int fill_extra_space
;
7923 bfd_vma entry_sec_offset
;
7926 entry_sec_offset
= src_entry
->address
- sec
->vma
+ src_entry
->size
;
7928 entry_sec_offset
= rel
->r_rel
.target_offset
+4;
7930 /* If the literal range is at the end of the section,
7932 fill_extra_space
= 0;
7933 the_add_entry
= elf_xtensa_find_property_entry (prop_table
, ptblsize
,
7935 if (the_add_entry
&& (the_add_entry
->flags
& XTENSA_PROP_UNREACHABLE
))
7936 fill_extra_space
= the_add_entry
->size
;
7938 fa
= find_fill_action (&relax_info
->action_list
, sec
, entry_sec_offset
);
7939 removed_diff
= compute_removed_action_diff (fa
, sec
, entry_sec_offset
,
7940 -4, fill_extra_space
);
7942 adjust_fill_action (fa
, removed_diff
);
7944 text_action_add (&relax_info
->action_list
,
7945 ta_fill
, sec
, entry_sec_offset
, removed_diff
);
7952 /* Second relaxation pass. */
7954 /* Modify all of the relocations to point to the right spot, and if this
7955 is a relaxable section, delete the unwanted literals and fix the
7959 relax_section (bfd
*abfd
, asection
*sec
, struct bfd_link_info
*link_info
)
7961 Elf_Internal_Rela
*internal_relocs
;
7962 xtensa_relax_info
*relax_info
;
7964 bfd_boolean ok
= TRUE
;
7966 bfd_boolean rv
= FALSE
;
7967 bfd_boolean virtual_action
;
7968 bfd_size_type sec_size
;
7970 sec_size
= bfd_get_section_limit (abfd
, sec
);
7971 relax_info
= get_xtensa_relax_info (sec
);
7972 BFD_ASSERT (relax_info
);
7974 /* First translate any of the fixes that have been added already. */
7975 translate_section_fixes (sec
);
7977 /* Handle property sections (e.g., literal tables) specially. */
7978 if (xtensa_is_property_section (sec
))
7980 BFD_ASSERT (!relax_info
->is_relaxable_literal_section
);
7981 return relax_property_section (abfd
, sec
, link_info
);
7984 internal_relocs
= retrieve_internal_relocs (abfd
, sec
,
7985 link_info
->keep_memory
);
7986 contents
= retrieve_contents (abfd
, sec
, link_info
->keep_memory
);
7987 if (contents
== NULL
&& sec_size
!= 0)
7993 if (internal_relocs
)
7995 for (i
= 0; i
< sec
->reloc_count
; i
++)
7997 Elf_Internal_Rela
*irel
;
7998 xtensa_relax_info
*target_relax_info
;
7999 bfd_vma source_offset
, old_source_offset
;
8002 asection
*target_sec
;
8004 /* Locally change the source address.
8005 Translate the target to the new target address.
8006 If it points to this section and has been removed,
8010 irel
= &internal_relocs
[i
];
8011 source_offset
= irel
->r_offset
;
8012 old_source_offset
= source_offset
;
8014 r_type
= ELF32_R_TYPE (irel
->r_info
);
8015 r_reloc_init (&r_rel
, abfd
, irel
, contents
,
8016 bfd_get_section_limit (abfd
, sec
));
8018 /* If this section could have changed then we may need to
8019 change the relocation's offset. */
8021 if (relax_info
->is_relaxable_literal_section
8022 || relax_info
->is_relaxable_asm_section
)
8024 if (r_type
!= R_XTENSA_NONE
8025 && find_removed_literal (&relax_info
->removed_list
,
8028 /* Remove this relocation. */
8029 if (elf_hash_table (link_info
)->dynamic_sections_created
)
8030 shrink_dynamic_reloc_sections (link_info
, abfd
, sec
, irel
);
8031 irel
->r_info
= ELF32_R_INFO (0, R_XTENSA_NONE
);
8032 irel
->r_offset
= offset_with_removed_text
8033 (&relax_info
->action_list
, irel
->r_offset
);
8034 pin_internal_relocs (sec
, internal_relocs
);
8038 if (r_type
== R_XTENSA_ASM_SIMPLIFY
)
8040 text_action
*action
=
8041 find_insn_action (&relax_info
->action_list
,
8043 if (action
&& (action
->action
== ta_convert_longcall
8044 || action
->action
== ta_remove_longcall
))
8046 bfd_reloc_status_type retval
;
8047 char *error_message
= NULL
;
8049 retval
= contract_asm_expansion (contents
, sec_size
,
8050 irel
, &error_message
);
8051 if (retval
!= bfd_reloc_ok
)
8053 (*link_info
->callbacks
->reloc_dangerous
)
8054 (link_info
, error_message
, abfd
, sec
,
8058 /* Update the action so that the code that moves
8059 the contents will do the right thing. */
8060 if (action
->action
== ta_remove_longcall
)
8061 action
->action
= ta_remove_insn
;
8063 action
->action
= ta_none
;
8064 /* Refresh the info in the r_rel. */
8065 r_reloc_init (&r_rel
, abfd
, irel
, contents
, sec_size
);
8066 r_type
= ELF32_R_TYPE (irel
->r_info
);
8070 source_offset
= offset_with_removed_text
8071 (&relax_info
->action_list
, irel
->r_offset
);
8072 irel
->r_offset
= source_offset
;
8075 /* If the target section could have changed then
8076 we may need to change the relocation's target offset. */
8078 target_sec
= r_reloc_get_section (&r_rel
);
8079 target_relax_info
= get_xtensa_relax_info (target_sec
);
8081 if (target_relax_info
8082 && (target_relax_info
->is_relaxable_literal_section
8083 || target_relax_info
->is_relaxable_asm_section
))
8087 bfd_vma addend_displacement
;
8089 translate_reloc (&r_rel
, &new_reloc
);
8091 if (r_type
== R_XTENSA_DIFF8
8092 || r_type
== R_XTENSA_DIFF16
8093 || r_type
== R_XTENSA_DIFF32
)
8095 bfd_vma diff_value
= 0, new_end_offset
, diff_mask
= 0;
8097 if (bfd_get_section_limit (abfd
, sec
) < old_source_offset
)
8099 (*link_info
->callbacks
->reloc_dangerous
)
8100 (link_info
, _("invalid relocation address"),
8101 abfd
, sec
, old_source_offset
);
8107 case R_XTENSA_DIFF8
:
8109 bfd_get_8 (abfd
, &contents
[old_source_offset
]);
8111 case R_XTENSA_DIFF16
:
8113 bfd_get_16 (abfd
, &contents
[old_source_offset
]);
8115 case R_XTENSA_DIFF32
:
8117 bfd_get_32 (abfd
, &contents
[old_source_offset
]);
8121 new_end_offset
= offset_with_removed_text
8122 (&target_relax_info
->action_list
,
8123 r_rel
.target_offset
+ diff_value
);
8124 diff_value
= new_end_offset
- new_reloc
.target_offset
;
8128 case R_XTENSA_DIFF8
:
8130 bfd_put_8 (abfd
, diff_value
,
8131 &contents
[old_source_offset
]);
8133 case R_XTENSA_DIFF16
:
8135 bfd_put_16 (abfd
, diff_value
,
8136 &contents
[old_source_offset
]);
8138 case R_XTENSA_DIFF32
:
8139 diff_mask
= 0xffffffff;
8140 bfd_put_32 (abfd
, diff_value
,
8141 &contents
[old_source_offset
]);
8145 /* Check for overflow. */
8146 if ((diff_value
& ~diff_mask
) != 0)
8148 (*link_info
->callbacks
->reloc_dangerous
)
8149 (link_info
, _("overflow after relaxation"),
8150 abfd
, sec
, old_source_offset
);
8154 pin_contents (sec
, contents
);
8157 /* FIXME: If the relocation still references a section in
8158 the same input file, the relocation should be modified
8159 directly instead of adding a "fix" record. */
8161 addend_displacement
=
8162 new_reloc
.target_offset
+ new_reloc
.virtual_offset
;
8164 fix
= reloc_bfd_fix_init (sec
, source_offset
, r_type
, 0,
8165 r_reloc_get_section (&new_reloc
),
8166 addend_displacement
, TRUE
);
8170 pin_internal_relocs (sec
, internal_relocs
);
8174 if ((relax_info
->is_relaxable_literal_section
8175 || relax_info
->is_relaxable_asm_section
)
8176 && relax_info
->action_list
.head
)
8178 /* Walk through the planned actions and build up a table
8179 of move, copy and fill records. Use the move, copy and
8180 fill records to perform the actions once. */
8182 bfd_size_type size
= sec
->size
;
8184 bfd_size_type final_size
, copy_size
, orig_insn_size
;
8185 bfd_byte
*scratch
= NULL
;
8186 bfd_byte
*dup_contents
= NULL
;
8187 bfd_size_type orig_size
= size
;
8188 bfd_vma orig_dot
= 0;
8189 bfd_vma orig_dot_copied
= 0; /* Byte copied already from
8190 orig dot in physical memory. */
8191 bfd_vma orig_dot_vo
= 0; /* Virtual offset from orig_dot. */
8192 bfd_vma dup_dot
= 0;
8194 text_action
*action
= relax_info
->action_list
.head
;
8196 final_size
= sec
->size
;
8197 for (action
= relax_info
->action_list
.head
; action
;
8198 action
= action
->next
)
8200 final_size
-= action
->removed_bytes
;
8203 scratch
= (bfd_byte
*) bfd_zmalloc (final_size
);
8204 dup_contents
= (bfd_byte
*) bfd_zmalloc (final_size
);
8206 /* The dot is the current fill location. */
8208 print_action_list (stderr
, &relax_info
->action_list
);
8211 for (action
= relax_info
->action_list
.head
; action
;
8212 action
= action
->next
)
8214 virtual_action
= FALSE
;
8215 if (action
->offset
> orig_dot
)
8217 orig_dot
+= orig_dot_copied
;
8218 orig_dot_copied
= 0;
8220 /* Out of the virtual world. */
8223 if (action
->offset
> orig_dot
)
8225 copy_size
= action
->offset
- orig_dot
;
8226 memmove (&dup_contents
[dup_dot
], &contents
[orig_dot
], copy_size
);
8227 orig_dot
+= copy_size
;
8228 dup_dot
+= copy_size
;
8229 BFD_ASSERT (action
->offset
== orig_dot
);
8231 else if (action
->offset
< orig_dot
)
8233 if (action
->action
== ta_fill
8234 && action
->offset
- action
->removed_bytes
== orig_dot
)
8236 /* This is OK because the fill only effects the dup_dot. */
8238 else if (action
->action
== ta_add_literal
)
8240 /* TBD. Might need to handle this. */
8243 if (action
->offset
== orig_dot
)
8245 if (action
->virtual_offset
> orig_dot_vo
)
8247 if (orig_dot_vo
== 0)
8249 /* Need to copy virtual_offset bytes. Probably four. */
8250 copy_size
= action
->virtual_offset
- orig_dot_vo
;
8251 memmove (&dup_contents
[dup_dot
],
8252 &contents
[orig_dot
], copy_size
);
8253 orig_dot_copied
= copy_size
;
8254 dup_dot
+= copy_size
;
8256 virtual_action
= TRUE
;
8259 BFD_ASSERT (action
->virtual_offset
<= orig_dot_vo
);
8261 switch (action
->action
)
8263 case ta_remove_literal
:
8264 case ta_remove_insn
:
8265 BFD_ASSERT (action
->removed_bytes
>= 0);
8266 orig_dot
+= action
->removed_bytes
;
8269 case ta_narrow_insn
:
8272 memmove (scratch
, &contents
[orig_dot
], orig_insn_size
);
8273 BFD_ASSERT (action
->removed_bytes
== 1);
8274 rv
= narrow_instruction (scratch
, final_size
, 0);
8276 memmove (&dup_contents
[dup_dot
], scratch
, copy_size
);
8277 orig_dot
+= orig_insn_size
;
8278 dup_dot
+= copy_size
;
8282 if (action
->removed_bytes
>= 0)
8283 orig_dot
+= action
->removed_bytes
;
8286 /* Already zeroed in dup_contents. Just bump the
8288 dup_dot
+= (-action
->removed_bytes
);
8293 BFD_ASSERT (action
->removed_bytes
== 0);
8296 case ta_convert_longcall
:
8297 case ta_remove_longcall
:
8298 /* These will be removed or converted before we get here. */
8305 memmove (scratch
, &contents
[orig_dot
], orig_insn_size
);
8306 BFD_ASSERT (action
->removed_bytes
== -1);
8307 rv
= widen_instruction (scratch
, final_size
, 0);
8309 memmove (&dup_contents
[dup_dot
], scratch
, copy_size
);
8310 orig_dot
+= orig_insn_size
;
8311 dup_dot
+= copy_size
;
8314 case ta_add_literal
:
8317 BFD_ASSERT (action
->removed_bytes
== -4);
8318 /* TBD -- place the literal value here and insert
8320 memset (&dup_contents
[dup_dot
], 0, 4);
8321 pin_internal_relocs (sec
, internal_relocs
);
8322 pin_contents (sec
, contents
);
8324 if (!move_literal (abfd
, link_info
, sec
, dup_dot
, dup_contents
,
8325 relax_info
, &internal_relocs
, &action
->value
))
8329 orig_dot_vo
+= copy_size
;
8331 orig_dot
+= orig_insn_size
;
8332 dup_dot
+= copy_size
;
8336 /* Not implemented yet. */
8341 size
-= action
->removed_bytes
;
8342 removed
+= action
->removed_bytes
;
8343 BFD_ASSERT (dup_dot
<= final_size
);
8344 BFD_ASSERT (orig_dot
<= orig_size
);
8347 orig_dot
+= orig_dot_copied
;
8348 orig_dot_copied
= 0;
8350 if (orig_dot
!= orig_size
)
8352 copy_size
= orig_size
- orig_dot
;
8353 BFD_ASSERT (orig_size
> orig_dot
);
8354 BFD_ASSERT (dup_dot
+ copy_size
== final_size
);
8355 memmove (&dup_contents
[dup_dot
], &contents
[orig_dot
], copy_size
);
8356 orig_dot
+= copy_size
;
8357 dup_dot
+= copy_size
;
8359 BFD_ASSERT (orig_size
== orig_dot
);
8360 BFD_ASSERT (final_size
== dup_dot
);
8362 /* Move the dup_contents back. */
8363 if (final_size
> orig_size
)
8365 /* Contents need to be reallocated. Swap the dup_contents into
8367 sec
->contents
= dup_contents
;
8369 contents
= dup_contents
;
8370 pin_contents (sec
, contents
);
8374 BFD_ASSERT (final_size
<= orig_size
);
8375 memset (contents
, 0, orig_size
);
8376 memcpy (contents
, dup_contents
, final_size
);
8377 free (dup_contents
);
8380 pin_contents (sec
, contents
);
8382 sec
->size
= final_size
;
8386 release_internal_relocs (sec
, internal_relocs
);
8387 release_contents (sec
, contents
);
8393 translate_section_fixes (asection
*sec
)
8395 xtensa_relax_info
*relax_info
;
8398 relax_info
= get_xtensa_relax_info (sec
);
8402 for (r
= relax_info
->fix_list
; r
!= NULL
; r
= r
->next
)
8403 if (!translate_reloc_bfd_fix (r
))
8410 /* Translate a fix given the mapping in the relax info for the target
8411 section. If it has already been translated, no work is required. */
8414 translate_reloc_bfd_fix (reloc_bfd_fix
*fix
)
8416 reloc_bfd_fix new_fix
;
8418 xtensa_relax_info
*relax_info
;
8419 removed_literal
*removed
;
8420 bfd_vma new_offset
, target_offset
;
8422 if (fix
->translated
)
8425 sec
= fix
->target_sec
;
8426 target_offset
= fix
->target_offset
;
8428 relax_info
= get_xtensa_relax_info (sec
);
8431 fix
->translated
= TRUE
;
8437 /* The fix does not need to be translated if the section cannot change. */
8438 if (!relax_info
->is_relaxable_literal_section
8439 && !relax_info
->is_relaxable_asm_section
)
8441 fix
->translated
= TRUE
;
8445 /* If the literal has been moved and this relocation was on an
8446 opcode, then the relocation should move to the new literal
8447 location. Otherwise, the relocation should move within the
8451 if (is_operand_relocation (fix
->src_type
))
8453 /* Check if the original relocation is against a literal being
8455 removed
= find_removed_literal (&relax_info
->removed_list
,
8463 /* The fact that there is still a relocation to this literal indicates
8464 that the literal is being coalesced, not simply removed. */
8465 BFD_ASSERT (removed
->to
.abfd
!= NULL
);
8467 /* This was moved to some other address (possibly another section). */
8468 new_sec
= r_reloc_get_section (&removed
->to
);
8472 relax_info
= get_xtensa_relax_info (sec
);
8474 (!relax_info
->is_relaxable_literal_section
8475 && !relax_info
->is_relaxable_asm_section
))
8477 target_offset
= removed
->to
.target_offset
;
8478 new_fix
.target_sec
= new_sec
;
8479 new_fix
.target_offset
= target_offset
;
8480 new_fix
.translated
= TRUE
;
8485 target_offset
= removed
->to
.target_offset
;
8486 new_fix
.target_sec
= new_sec
;
8489 /* The target address may have been moved within its section. */
8490 new_offset
= offset_with_removed_text (&relax_info
->action_list
,
8493 new_fix
.target_offset
= new_offset
;
8494 new_fix
.target_offset
= new_offset
;
8495 new_fix
.translated
= TRUE
;
8501 /* Fix up a relocation to take account of removed literals. */
8504 translate_reloc (const r_reloc
*orig_rel
, r_reloc
*new_rel
)
8507 xtensa_relax_info
*relax_info
;
8508 removed_literal
*removed
;
8509 bfd_vma new_offset
, target_offset
, removed_bytes
;
8511 *new_rel
= *orig_rel
;
8513 if (!r_reloc_is_defined (orig_rel
))
8515 sec
= r_reloc_get_section (orig_rel
);
8517 relax_info
= get_xtensa_relax_info (sec
);
8518 BFD_ASSERT (relax_info
);
8520 if (!relax_info
->is_relaxable_literal_section
8521 && !relax_info
->is_relaxable_asm_section
)
8524 target_offset
= orig_rel
->target_offset
;
8527 if (is_operand_relocation (ELF32_R_TYPE (orig_rel
->rela
.r_info
)))
8529 /* Check if the original relocation is against a literal being
8531 removed
= find_removed_literal (&relax_info
->removed_list
,
8534 if (removed
&& removed
->to
.abfd
)
8538 /* The fact that there is still a relocation to this literal indicates
8539 that the literal is being coalesced, not simply removed. */
8540 BFD_ASSERT (removed
->to
.abfd
!= NULL
);
8542 /* This was moved to some other address
8543 (possibly in another section). */
8544 *new_rel
= removed
->to
;
8545 new_sec
= r_reloc_get_section (new_rel
);
8549 relax_info
= get_xtensa_relax_info (sec
);
8551 || (!relax_info
->is_relaxable_literal_section
8552 && !relax_info
->is_relaxable_asm_section
))
8555 target_offset
= new_rel
->target_offset
;
8558 /* ...and the target address may have been moved within its section. */
8559 new_offset
= offset_with_removed_text (&relax_info
->action_list
,
8562 /* Modify the offset and addend. */
8563 removed_bytes
= target_offset
- new_offset
;
8564 new_rel
->target_offset
= new_offset
;
8565 new_rel
->rela
.r_addend
-= removed_bytes
;
8569 /* For dynamic links, there may be a dynamic relocation for each
8570 literal. The number of dynamic relocations must be computed in
8571 size_dynamic_sections, which occurs before relaxation. When a
8572 literal is removed, this function checks if there is a corresponding
8573 dynamic relocation and shrinks the size of the appropriate dynamic
8574 relocation section accordingly. At this point, the contents of the
8575 dynamic relocation sections have not yet been filled in, so there's
8576 nothing else that needs to be done. */
8579 shrink_dynamic_reloc_sections (struct bfd_link_info
*info
,
8581 asection
*input_section
,
8582 Elf_Internal_Rela
*rel
)
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 symtab_hdr
= &elf_tdata (abfd
)->symtab_hdr
;
8592 sym_hashes
= elf_sym_hashes (abfd
);
8594 r_type
= ELF32_R_TYPE (rel
->r_info
);
8595 r_symndx
= ELF32_R_SYM (rel
->r_info
);
8597 if (r_symndx
< symtab_hdr
->sh_info
)
8600 h
= sym_hashes
[r_symndx
- symtab_hdr
->sh_info
];
8602 dynamic_symbol
= xtensa_elf_dynamic_symbol_p (h
, info
);
8604 if ((r_type
== R_XTENSA_32
|| r_type
== R_XTENSA_PLT
)
8605 && (input_section
->flags
& SEC_ALLOC
) != 0
8606 && (dynamic_symbol
|| info
->shared
))
8609 const char *srel_name
;
8611 bfd_boolean is_plt
= FALSE
;
8613 dynobj
= elf_hash_table (info
)->dynobj
;
8614 BFD_ASSERT (dynobj
!= NULL
);
8616 if (dynamic_symbol
&& r_type
== R_XTENSA_PLT
)
8618 srel_name
= ".rela.plt";
8622 srel_name
= ".rela.got";
8624 /* Reduce size of the .rela.* section by one reloc. */
8625 srel
= bfd_get_section_by_name (dynobj
, srel_name
);
8626 BFD_ASSERT (srel
!= NULL
);
8627 BFD_ASSERT (srel
->size
>= sizeof (Elf32_External_Rela
));
8628 srel
->size
-= sizeof (Elf32_External_Rela
);
8632 asection
*splt
, *sgotplt
, *srelgot
;
8633 int reloc_index
, chunk
;
8635 /* Find the PLT reloc index of the entry being removed. This
8636 is computed from the size of ".rela.plt". It is needed to
8637 figure out which PLT chunk to resize. Usually "last index
8638 = size - 1" since the index starts at zero, but in this
8639 context, the size has just been decremented so there's no
8640 need to subtract one. */
8641 reloc_index
= srel
->size
/ sizeof (Elf32_External_Rela
);
8643 chunk
= reloc_index
/ PLT_ENTRIES_PER_CHUNK
;
8644 splt
= elf_xtensa_get_plt_section (dynobj
, chunk
);
8645 sgotplt
= elf_xtensa_get_gotplt_section (dynobj
, chunk
);
8646 BFD_ASSERT (splt
!= NULL
&& sgotplt
!= NULL
);
8648 /* Check if an entire PLT chunk has just been eliminated. */
8649 if (reloc_index
% PLT_ENTRIES_PER_CHUNK
== 0)
8651 /* The two magic GOT entries for that chunk can go away. */
8652 srelgot
= bfd_get_section_by_name (dynobj
, ".rela.got");
8653 BFD_ASSERT (srelgot
!= NULL
);
8654 srelgot
->reloc_count
-= 2;
8655 srelgot
->size
-= 2 * sizeof (Elf32_External_Rela
);
8658 /* There should be only one entry left (and it will be
8660 BFD_ASSERT (sgotplt
->size
== 4);
8661 BFD_ASSERT (splt
->size
== PLT_ENTRY_SIZE
);
8664 BFD_ASSERT (sgotplt
->size
>= 4);
8665 BFD_ASSERT (splt
->size
>= PLT_ENTRY_SIZE
);
8668 splt
->size
-= PLT_ENTRY_SIZE
;
8674 /* Take an r_rel and move it to another section. This usually
8675 requires extending the interal_relocation array and pinning it. If
8676 the original r_rel is from the same BFD, we can complete this here.
8677 Otherwise, we add a fix record to let the final link fix the
8678 appropriate address. Contents and internal relocations for the
8679 section must be pinned after calling this routine. */
8682 move_literal (bfd
*abfd
,
8683 struct bfd_link_info
*link_info
,
8687 xtensa_relax_info
*relax_info
,
8688 Elf_Internal_Rela
**internal_relocs_p
,
8689 const literal_value
*lit
)
8691 Elf_Internal_Rela
*new_relocs
= NULL
;
8692 size_t new_relocs_count
= 0;
8693 Elf_Internal_Rela this_rela
;
8694 const r_reloc
*r_rel
;
8696 r_rel
= &lit
->r_rel
;
8697 BFD_ASSERT (elf_section_data (sec
)->relocs
== *internal_relocs_p
);
8699 if (r_reloc_is_const (r_rel
))
8700 bfd_put_32 (abfd
, lit
->value
, contents
+ offset
);
8705 asection
*target_sec
;
8709 r_type
= ELF32_R_TYPE (r_rel
->rela
.r_info
);
8710 target_sec
= r_reloc_get_section (r_rel
);
8712 /* This is the difficult case. We have to create a fix up. */
8713 this_rela
.r_offset
= offset
;
8714 this_rela
.r_info
= ELF32_R_INFO (0, r_type
);
8715 this_rela
.r_addend
=
8716 r_rel
->target_offset
- r_reloc_get_target_offset (r_rel
);
8717 bfd_put_32 (abfd
, lit
->value
, contents
+ offset
);
8719 /* Currently, we cannot move relocations during a relocatable link. */
8720 BFD_ASSERT (!link_info
->relocatable
);
8721 fix
= reloc_bfd_fix_init (sec
, offset
, r_type
, r_rel
->abfd
,
8722 r_reloc_get_section (r_rel
),
8723 r_rel
->target_offset
+ r_rel
->virtual_offset
,
8725 /* We also need to mark that relocations are needed here. */
8726 sec
->flags
|= SEC_RELOC
;
8728 translate_reloc_bfd_fix (fix
);
8729 /* This fix has not yet been translated. */
8732 /* Add the relocation. If we have already allocated our own
8733 space for the relocations and we have room for more, then use
8734 it. Otherwise, allocate new space and move the literals. */
8735 insert_at
= sec
->reloc_count
;
8736 for (i
= 0; i
< sec
->reloc_count
; ++i
)
8738 if (this_rela
.r_offset
< (*internal_relocs_p
)[i
].r_offset
)
8745 if (*internal_relocs_p
!= relax_info
->allocated_relocs
8746 || sec
->reloc_count
+ 1 > relax_info
->allocated_relocs_count
)
8748 BFD_ASSERT (relax_info
->allocated_relocs
== NULL
8749 || sec
->reloc_count
== relax_info
->relocs_count
);
8751 if (relax_info
->allocated_relocs_count
== 0)
8752 new_relocs_count
= (sec
->reloc_count
+ 2) * 2;
8754 new_relocs_count
= (relax_info
->allocated_relocs_count
+ 2) * 2;
8756 new_relocs
= (Elf_Internal_Rela
*)
8757 bfd_zmalloc (sizeof (Elf_Internal_Rela
) * (new_relocs_count
));
8761 /* We could handle this more quickly by finding the split point. */
8763 memcpy (new_relocs
, *internal_relocs_p
,
8764 insert_at
* sizeof (Elf_Internal_Rela
));
8766 new_relocs
[insert_at
] = this_rela
;
8768 if (insert_at
!= sec
->reloc_count
)
8769 memcpy (new_relocs
+ insert_at
+ 1,
8770 (*internal_relocs_p
) + insert_at
,
8771 (sec
->reloc_count
- insert_at
)
8772 * sizeof (Elf_Internal_Rela
));
8774 if (*internal_relocs_p
!= relax_info
->allocated_relocs
)
8776 /* The first time we re-allocate, we can only free the
8777 old relocs if they were allocated with bfd_malloc.
8778 This is not true when keep_memory is in effect. */
8779 if (!link_info
->keep_memory
)
8780 free (*internal_relocs_p
);
8783 free (*internal_relocs_p
);
8784 relax_info
->allocated_relocs
= new_relocs
;
8785 relax_info
->allocated_relocs_count
= new_relocs_count
;
8786 elf_section_data (sec
)->relocs
= new_relocs
;
8788 relax_info
->relocs_count
= sec
->reloc_count
;
8789 *internal_relocs_p
= new_relocs
;
8793 if (insert_at
!= sec
->reloc_count
)
8796 for (idx
= sec
->reloc_count
; idx
> insert_at
; idx
--)
8797 (*internal_relocs_p
)[idx
] = (*internal_relocs_p
)[idx
-1];
8799 (*internal_relocs_p
)[insert_at
] = this_rela
;
8801 if (relax_info
->allocated_relocs
)
8802 relax_info
->relocs_count
= sec
->reloc_count
;
8809 /* This is similar to relax_section except that when a target is moved,
8810 we shift addresses up. We also need to modify the size. This
8811 algorithm does NOT allow for relocations into the middle of the
8812 property sections. */
8815 relax_property_section (bfd
*abfd
,
8817 struct bfd_link_info
*link_info
)
8819 Elf_Internal_Rela
*internal_relocs
;
8822 bfd_boolean ok
= TRUE
;
8823 bfd_boolean is_full_prop_section
;
8824 size_t last_zfill_target_offset
= 0;
8825 asection
*last_zfill_target_sec
= NULL
;
8826 bfd_size_type sec_size
;
8828 sec_size
= bfd_get_section_limit (abfd
, sec
);
8829 internal_relocs
= retrieve_internal_relocs (abfd
, sec
,
8830 link_info
->keep_memory
);
8831 contents
= retrieve_contents (abfd
, sec
, link_info
->keep_memory
);
8832 if (contents
== NULL
&& sec_size
!= 0)
8838 is_full_prop_section
=
8839 ( CONST_STRNEQ (sec
->name
, XTENSA_PROP_SEC_NAME
)
8840 || CONST_STRNEQ (sec
->name
, ".gnu.linkonce.prop."));
8842 if (internal_relocs
)
8844 for (i
= 0; i
< sec
->reloc_count
; i
++)
8846 Elf_Internal_Rela
*irel
;
8847 xtensa_relax_info
*target_relax_info
;
8849 asection
*target_sec
;
8851 bfd_byte
*size_p
, *flags_p
;
8853 /* Locally change the source address.
8854 Translate the target to the new target address.
8855 If it points to this section and has been removed, MOVE IT.
8856 Also, don't forget to modify the associated SIZE at
8859 irel
= &internal_relocs
[i
];
8860 r_type
= ELF32_R_TYPE (irel
->r_info
);
8861 if (r_type
== R_XTENSA_NONE
)
8864 /* Find the literal value. */
8865 r_reloc_init (&val
.r_rel
, abfd
, irel
, contents
, sec_size
);
8866 size_p
= &contents
[irel
->r_offset
+ 4];
8868 if (is_full_prop_section
)
8870 flags_p
= &contents
[irel
->r_offset
+ 8];
8871 BFD_ASSERT (irel
->r_offset
+ 12 <= sec_size
);
8874 BFD_ASSERT (irel
->r_offset
+ 8 <= sec_size
);
8876 target_sec
= r_reloc_get_section (&val
.r_rel
);
8877 target_relax_info
= get_xtensa_relax_info (target_sec
);
8879 if (target_relax_info
8880 && (target_relax_info
->is_relaxable_literal_section
8881 || target_relax_info
->is_relaxable_asm_section
))
8883 /* Translate the relocation's destination. */
8884 bfd_vma new_offset
, new_end_offset
;
8885 long old_size
, new_size
;
8887 new_offset
= offset_with_removed_text
8888 (&target_relax_info
->action_list
, val
.r_rel
.target_offset
);
8890 /* Assert that we are not out of bounds. */
8891 old_size
= bfd_get_32 (abfd
, size_p
);
8895 /* Only the first zero-sized unreachable entry is
8896 allowed to expand. In this case the new offset
8897 should be the offset before the fill and the new
8898 size is the expansion size. For other zero-sized
8899 entries the resulting size should be zero with an
8900 offset before or after the fill address depending
8901 on whether the expanding unreachable entry
8903 if (last_zfill_target_sec
8904 && last_zfill_target_sec
== target_sec
8905 && last_zfill_target_offset
== val
.r_rel
.target_offset
)
8906 new_end_offset
= new_offset
;
8909 new_end_offset
= new_offset
;
8910 new_offset
= offset_with_removed_text_before_fill
8911 (&target_relax_info
->action_list
,
8912 val
.r_rel
.target_offset
);
8914 /* If it is not unreachable and we have not yet
8915 seen an unreachable at this address, place it
8916 before the fill address. */
8918 || (bfd_get_32 (abfd
, flags_p
)
8919 & XTENSA_PROP_UNREACHABLE
) == 0)
8920 new_end_offset
= new_offset
;
8923 last_zfill_target_sec
= target_sec
;
8924 last_zfill_target_offset
= val
.r_rel
.target_offset
;
8930 new_end_offset
= offset_with_removed_text_before_fill
8931 (&target_relax_info
->action_list
,
8932 val
.r_rel
.target_offset
+ old_size
);
8935 new_size
= new_end_offset
- new_offset
;
8937 if (new_size
!= old_size
)
8939 bfd_put_32 (abfd
, new_size
, size_p
);
8940 pin_contents (sec
, contents
);
8943 if (new_offset
!= val
.r_rel
.target_offset
)
8945 bfd_vma diff
= new_offset
- val
.r_rel
.target_offset
;
8946 irel
->r_addend
+= diff
;
8947 pin_internal_relocs (sec
, internal_relocs
);
8953 /* Combine adjacent property table entries. This is also done in
8954 finish_dynamic_sections() but at that point it's too late to
8955 reclaim the space in the output section, so we do this twice. */
8957 if (internal_relocs
&& (!link_info
->relocatable
8958 || strcmp (sec
->name
, XTENSA_LIT_SEC_NAME
) == 0))
8960 Elf_Internal_Rela
*last_irel
= NULL
;
8961 int removed_bytes
= 0;
8962 bfd_vma offset
, last_irel_offset
;
8963 bfd_vma section_size
;
8964 bfd_size_type entry_size
;
8965 flagword predef_flags
;
8967 if (is_full_prop_section
)
8972 predef_flags
= xtensa_get_property_predef_flags (sec
);
8974 /* Walk over memory and irels at the same time.
8975 This REQUIRES that the internal_relocs be sorted by offset. */
8976 qsort (internal_relocs
, sec
->reloc_count
, sizeof (Elf_Internal_Rela
),
8977 internal_reloc_compare
);
8978 nexti
= 0; /* Index into internal_relocs. */
8980 pin_internal_relocs (sec
, internal_relocs
);
8981 pin_contents (sec
, contents
);
8983 last_irel_offset
= (bfd_vma
) -1;
8984 section_size
= sec
->size
;
8985 BFD_ASSERT (section_size
% entry_size
== 0);
8987 for (offset
= 0; offset
< section_size
; offset
+= entry_size
)
8989 Elf_Internal_Rela
*irel
, *next_irel
;
8990 bfd_vma bytes_to_remove
, size
, actual_offset
;
8991 bfd_boolean remove_this_irel
;
8997 /* Find the next two relocations (if there are that many left),
8998 skipping over any R_XTENSA_NONE relocs. On entry, "nexti" is
8999 the starting reloc index. After these two loops, "i"
9000 is the index of the first non-NONE reloc past that starting
9001 index, and "nexti" is the index for the next non-NONE reloc
9004 for (i
= nexti
; i
< sec
->reloc_count
; i
++)
9006 if (ELF32_R_TYPE (internal_relocs
[i
].r_info
) != R_XTENSA_NONE
)
9008 irel
= &internal_relocs
[i
];
9011 internal_relocs
[i
].r_offset
-= removed_bytes
;
9014 for (nexti
= i
+ 1; nexti
< sec
->reloc_count
; nexti
++)
9016 if (ELF32_R_TYPE (internal_relocs
[nexti
].r_info
)
9019 next_irel
= &internal_relocs
[nexti
];
9022 internal_relocs
[nexti
].r_offset
-= removed_bytes
;
9025 remove_this_irel
= FALSE
;
9026 bytes_to_remove
= 0;
9027 actual_offset
= offset
- removed_bytes
;
9028 size
= bfd_get_32 (abfd
, &contents
[actual_offset
+ 4]);
9030 if (is_full_prop_section
)
9031 flags
= bfd_get_32 (abfd
, &contents
[actual_offset
+ 8]);
9033 flags
= predef_flags
;
9035 /* Check that the irels are sorted by offset,
9036 with only one per address. */
9037 BFD_ASSERT (!irel
|| (int) irel
->r_offset
> (int) last_irel_offset
);
9038 BFD_ASSERT (!next_irel
|| next_irel
->r_offset
> irel
->r_offset
);
9040 /* Make sure there aren't relocs on the size or flag fields. */
9041 if ((irel
&& irel
->r_offset
== offset
+ 4)
9042 || (is_full_prop_section
9043 && irel
&& irel
->r_offset
== offset
+ 8))
9045 irel
->r_offset
-= removed_bytes
;
9046 last_irel_offset
= irel
->r_offset
;
9048 else if (next_irel
&& (next_irel
->r_offset
== offset
+ 4
9049 || (is_full_prop_section
9050 && next_irel
->r_offset
== offset
+ 8)))
9053 irel
->r_offset
-= removed_bytes
;
9054 next_irel
->r_offset
-= removed_bytes
;
9055 last_irel_offset
= next_irel
->r_offset
;
9057 else if (size
== 0 && (flags
& XTENSA_PROP_ALIGN
) == 0
9058 && (flags
& XTENSA_PROP_UNREACHABLE
) == 0)
9060 /* Always remove entries with zero size and no alignment. */
9061 bytes_to_remove
= entry_size
;
9062 if (irel
&& irel
->r_offset
== offset
)
9064 remove_this_irel
= TRUE
;
9066 irel
->r_offset
-= removed_bytes
;
9067 last_irel_offset
= irel
->r_offset
;
9070 else if (irel
&& irel
->r_offset
== offset
)
9072 if (ELF32_R_TYPE (irel
->r_info
) == R_XTENSA_32
)
9078 bfd_get_32 (abfd
, &contents
[last_irel
->r_offset
+ 4]);
9079 bfd_vma old_address
=
9080 (last_irel
->r_addend
9081 + bfd_get_32 (abfd
, &contents
[last_irel
->r_offset
]));
9082 bfd_vma new_address
=
9084 + bfd_get_32 (abfd
, &contents
[actual_offset
]));
9085 if (is_full_prop_section
)
9086 old_flags
= bfd_get_32
9087 (abfd
, &contents
[last_irel
->r_offset
+ 8]);
9089 old_flags
= predef_flags
;
9091 if ((ELF32_R_SYM (irel
->r_info
)
9092 == ELF32_R_SYM (last_irel
->r_info
))
9093 && old_address
+ old_size
== new_address
9094 && old_flags
== flags
9095 && (old_flags
& XTENSA_PROP_INSN_BRANCH_TARGET
) == 0
9096 && (old_flags
& XTENSA_PROP_INSN_LOOP_TARGET
) == 0)
9098 /* Fix the old size. */
9099 bfd_put_32 (abfd
, old_size
+ size
,
9100 &contents
[last_irel
->r_offset
+ 4]);
9101 bytes_to_remove
= entry_size
;
9102 remove_this_irel
= TRUE
;
9111 irel
->r_offset
-= removed_bytes
;
9112 last_irel_offset
= irel
->r_offset
;
9115 if (remove_this_irel
)
9117 irel
->r_info
= ELF32_R_INFO (0, R_XTENSA_NONE
);
9118 irel
->r_offset
-= bytes_to_remove
;
9121 if (bytes_to_remove
!= 0)
9123 removed_bytes
+= bytes_to_remove
;
9124 if (offset
+ bytes_to_remove
< section_size
)
9125 memmove (&contents
[actual_offset
],
9126 &contents
[actual_offset
+ bytes_to_remove
],
9127 section_size
- offset
- bytes_to_remove
);
9133 /* Clear the removed bytes. */
9134 memset (&contents
[section_size
- removed_bytes
], 0, removed_bytes
);
9136 sec
->size
= section_size
- removed_bytes
;
9138 if (xtensa_is_littable_section (sec
))
9140 bfd
*dynobj
= elf_hash_table (link_info
)->dynobj
;
9144 bfd_get_section_by_name (dynobj
, ".got.loc");
9146 sgotloc
->size
-= removed_bytes
;
9153 release_internal_relocs (sec
, internal_relocs
);
9154 release_contents (sec
, contents
);
9159 /* Third relaxation pass. */
9161 /* Change symbol values to account for removed literals. */
9164 relax_section_symbols (bfd
*abfd
, asection
*sec
)
9166 xtensa_relax_info
*relax_info
;
9167 unsigned int sec_shndx
;
9168 Elf_Internal_Shdr
*symtab_hdr
;
9169 Elf_Internal_Sym
*isymbuf
;
9170 unsigned i
, num_syms
, num_locals
;
9172 relax_info
= get_xtensa_relax_info (sec
);
9173 BFD_ASSERT (relax_info
);
9175 if (!relax_info
->is_relaxable_literal_section
9176 && !relax_info
->is_relaxable_asm_section
)
9179 sec_shndx
= _bfd_elf_section_from_bfd_section (abfd
, sec
);
9181 symtab_hdr
= &elf_tdata (abfd
)->symtab_hdr
;
9182 isymbuf
= retrieve_local_syms (abfd
);
9184 num_syms
= symtab_hdr
->sh_size
/ sizeof (Elf32_External_Sym
);
9185 num_locals
= symtab_hdr
->sh_info
;
9187 /* Adjust the local symbols defined in this section. */
9188 for (i
= 0; i
< num_locals
; i
++)
9190 Elf_Internal_Sym
*isym
= &isymbuf
[i
];
9192 if (isym
->st_shndx
== sec_shndx
)
9194 bfd_vma new_address
= offset_with_removed_text
9195 (&relax_info
->action_list
, isym
->st_value
);
9196 bfd_vma new_size
= isym
->st_size
;
9198 if (ELF32_ST_TYPE (isym
->st_info
) == STT_FUNC
)
9200 bfd_vma new_end
= offset_with_removed_text
9201 (&relax_info
->action_list
, isym
->st_value
+ isym
->st_size
);
9202 new_size
= new_end
- new_address
;
9205 isym
->st_value
= new_address
;
9206 isym
->st_size
= new_size
;
9210 /* Now adjust the global symbols defined in this section. */
9211 for (i
= 0; i
< (num_syms
- num_locals
); i
++)
9213 struct elf_link_hash_entry
*sym_hash
;
9215 sym_hash
= elf_sym_hashes (abfd
)[i
];
9217 if (sym_hash
->root
.type
== bfd_link_hash_warning
)
9218 sym_hash
= (struct elf_link_hash_entry
*) sym_hash
->root
.u
.i
.link
;
9220 if ((sym_hash
->root
.type
== bfd_link_hash_defined
9221 || sym_hash
->root
.type
== bfd_link_hash_defweak
)
9222 && sym_hash
->root
.u
.def
.section
== sec
)
9224 bfd_vma new_address
= offset_with_removed_text
9225 (&relax_info
->action_list
, sym_hash
->root
.u
.def
.value
);
9226 bfd_vma new_size
= sym_hash
->size
;
9228 if (sym_hash
->type
== STT_FUNC
)
9230 bfd_vma new_end
= offset_with_removed_text
9231 (&relax_info
->action_list
,
9232 sym_hash
->root
.u
.def
.value
+ sym_hash
->size
);
9233 new_size
= new_end
- new_address
;
9236 sym_hash
->root
.u
.def
.value
= new_address
;
9237 sym_hash
->size
= new_size
;
9245 /* "Fix" handling functions, called while performing relocations. */
9248 do_fix_for_relocatable_link (Elf_Internal_Rela
*rel
,
9250 asection
*input_section
,
9254 asection
*sec
, *old_sec
;
9256 int r_type
= ELF32_R_TYPE (rel
->r_info
);
9259 if (r_type
== R_XTENSA_NONE
)
9262 fix
= get_bfd_fix (input_section
, rel
->r_offset
, r_type
);
9266 r_reloc_init (&r_rel
, input_bfd
, rel
, contents
,
9267 bfd_get_section_limit (input_bfd
, input_section
));
9268 old_sec
= r_reloc_get_section (&r_rel
);
9269 old_offset
= r_rel
.target_offset
;
9271 if (!old_sec
|| !r_reloc_is_defined (&r_rel
))
9273 if (r_type
!= R_XTENSA_ASM_EXPAND
)
9275 (*_bfd_error_handler
)
9276 (_("%B(%A+0x%lx): unexpected fix for %s relocation"),
9277 input_bfd
, input_section
, rel
->r_offset
,
9278 elf_howto_table
[r_type
].name
);
9281 /* Leave it be. Resolution will happen in a later stage. */
9285 sec
= fix
->target_sec
;
9286 rel
->r_addend
+= ((sec
->output_offset
+ fix
->target_offset
)
9287 - (old_sec
->output_offset
+ old_offset
));
9294 do_fix_for_final_link (Elf_Internal_Rela
*rel
,
9296 asection
*input_section
,
9298 bfd_vma
*relocationp
)
9301 int r_type
= ELF32_R_TYPE (rel
->r_info
);
9305 if (r_type
== R_XTENSA_NONE
)
9308 fix
= get_bfd_fix (input_section
, rel
->r_offset
, r_type
);
9312 sec
= fix
->target_sec
;
9314 fixup_diff
= rel
->r_addend
;
9315 if (elf_howto_table
[fix
->src_type
].partial_inplace
)
9317 bfd_vma inplace_val
;
9318 BFD_ASSERT (fix
->src_offset
9319 < bfd_get_section_limit (input_bfd
, input_section
));
9320 inplace_val
= bfd_get_32 (input_bfd
, &contents
[fix
->src_offset
]);
9321 fixup_diff
+= inplace_val
;
9324 *relocationp
= (sec
->output_section
->vma
9325 + sec
->output_offset
9326 + fix
->target_offset
- fixup_diff
);
9330 /* Miscellaneous utility functions.... */
9333 elf_xtensa_get_plt_section (bfd
*dynobj
, int chunk
)
9338 return bfd_get_section_by_name (dynobj
, ".plt");
9340 sprintf (plt_name
, ".plt.%u", chunk
);
9341 return bfd_get_section_by_name (dynobj
, plt_name
);
9346 elf_xtensa_get_gotplt_section (bfd
*dynobj
, int chunk
)
9351 return bfd_get_section_by_name (dynobj
, ".got.plt");
9353 sprintf (got_name
, ".got.plt.%u", chunk
);
9354 return bfd_get_section_by_name (dynobj
, got_name
);
9358 /* Get the input section for a given symbol index.
9360 . a section symbol, return the section;
9361 . a common symbol, return the common section;
9362 . an undefined symbol, return the undefined section;
9363 . an indirect symbol, follow the links;
9364 . an absolute value, return the absolute section. */
9367 get_elf_r_symndx_section (bfd
*abfd
, unsigned long r_symndx
)
9369 Elf_Internal_Shdr
*symtab_hdr
= &elf_tdata (abfd
)->symtab_hdr
;
9370 asection
*target_sec
= NULL
;
9371 if (r_symndx
< symtab_hdr
->sh_info
)
9373 Elf_Internal_Sym
*isymbuf
;
9374 unsigned int section_index
;
9376 isymbuf
= retrieve_local_syms (abfd
);
9377 section_index
= isymbuf
[r_symndx
].st_shndx
;
9379 if (section_index
== SHN_UNDEF
)
9380 target_sec
= bfd_und_section_ptr
;
9381 else if (section_index
> 0 && section_index
< SHN_LORESERVE
)
9382 target_sec
= bfd_section_from_elf_index (abfd
, section_index
);
9383 else if (section_index
== SHN_ABS
)
9384 target_sec
= bfd_abs_section_ptr
;
9385 else if (section_index
== SHN_COMMON
)
9386 target_sec
= bfd_com_section_ptr
;
9393 unsigned long indx
= r_symndx
- symtab_hdr
->sh_info
;
9394 struct elf_link_hash_entry
*h
= elf_sym_hashes (abfd
)[indx
];
9396 while (h
->root
.type
== bfd_link_hash_indirect
9397 || h
->root
.type
== bfd_link_hash_warning
)
9398 h
= (struct elf_link_hash_entry
*) h
->root
.u
.i
.link
;
9400 switch (h
->root
.type
)
9402 case bfd_link_hash_defined
:
9403 case bfd_link_hash_defweak
:
9404 target_sec
= h
->root
.u
.def
.section
;
9406 case bfd_link_hash_common
:
9407 target_sec
= bfd_com_section_ptr
;
9409 case bfd_link_hash_undefined
:
9410 case bfd_link_hash_undefweak
:
9411 target_sec
= bfd_und_section_ptr
;
9413 default: /* New indirect warning. */
9414 target_sec
= bfd_und_section_ptr
;
9422 static struct elf_link_hash_entry
*
9423 get_elf_r_symndx_hash_entry (bfd
*abfd
, unsigned long r_symndx
)
9426 struct elf_link_hash_entry
*h
;
9427 Elf_Internal_Shdr
*symtab_hdr
= &elf_tdata (abfd
)->symtab_hdr
;
9429 if (r_symndx
< symtab_hdr
->sh_info
)
9432 indx
= r_symndx
- symtab_hdr
->sh_info
;
9433 h
= elf_sym_hashes (abfd
)[indx
];
9434 while (h
->root
.type
== bfd_link_hash_indirect
9435 || h
->root
.type
== bfd_link_hash_warning
)
9436 h
= (struct elf_link_hash_entry
*) h
->root
.u
.i
.link
;
9441 /* Get the section-relative offset for a symbol number. */
9444 get_elf_r_symndx_offset (bfd
*abfd
, unsigned long r_symndx
)
9446 Elf_Internal_Shdr
*symtab_hdr
= &elf_tdata (abfd
)->symtab_hdr
;
9449 if (r_symndx
< symtab_hdr
->sh_info
)
9451 Elf_Internal_Sym
*isymbuf
;
9452 isymbuf
= retrieve_local_syms (abfd
);
9453 offset
= isymbuf
[r_symndx
].st_value
;
9457 unsigned long indx
= r_symndx
- symtab_hdr
->sh_info
;
9458 struct elf_link_hash_entry
*h
=
9459 elf_sym_hashes (abfd
)[indx
];
9461 while (h
->root
.type
== bfd_link_hash_indirect
9462 || h
->root
.type
== bfd_link_hash_warning
)
9463 h
= (struct elf_link_hash_entry
*) h
->root
.u
.i
.link
;
9464 if (h
->root
.type
== bfd_link_hash_defined
9465 || h
->root
.type
== bfd_link_hash_defweak
)
9466 offset
= h
->root
.u
.def
.value
;
9473 is_reloc_sym_weak (bfd
*abfd
, Elf_Internal_Rela
*rel
)
9475 unsigned long r_symndx
= ELF32_R_SYM (rel
->r_info
);
9476 struct elf_link_hash_entry
*h
;
9478 h
= get_elf_r_symndx_hash_entry (abfd
, r_symndx
);
9479 if (h
&& h
->root
.type
== bfd_link_hash_defweak
)
9486 pcrel_reloc_fits (xtensa_opcode opc
,
9488 bfd_vma self_address
,
9489 bfd_vma dest_address
)
9491 xtensa_isa isa
= xtensa_default_isa
;
9492 uint32 valp
= dest_address
;
9493 if (xtensa_operand_do_reloc (isa
, opc
, opnd
, &valp
, self_address
)
9494 || xtensa_operand_encode (isa
, opc
, opnd
, &valp
))
9500 static int linkonce_len
= sizeof (".gnu.linkonce.") - 1;
9503 xtensa_is_property_section (asection
*sec
)
9505 if (CONST_STRNEQ (sec
->name
, XTENSA_INSN_SEC_NAME
)
9506 || CONST_STRNEQ (sec
->name
, XTENSA_LIT_SEC_NAME
)
9507 || CONST_STRNEQ (sec
->name
, XTENSA_PROP_SEC_NAME
))
9510 if (strncmp (".gnu.linkonce.", sec
->name
, linkonce_len
) == 0
9511 && (CONST_STRNEQ (&sec
->name
[linkonce_len
], "x.")
9512 || CONST_STRNEQ (&sec
->name
[linkonce_len
], "p.")
9513 || CONST_STRNEQ (&sec
->name
[linkonce_len
], "prop.")))
9521 xtensa_is_littable_section (asection
*sec
)
9523 if (CONST_STRNEQ (sec
->name
, XTENSA_LIT_SEC_NAME
))
9526 if (strncmp (".gnu.linkonce.", sec
->name
, linkonce_len
) == 0
9527 && sec
->name
[linkonce_len
] == 'p'
9528 && sec
->name
[linkonce_len
+ 1] == '.')
9536 internal_reloc_compare (const void *ap
, const void *bp
)
9538 const Elf_Internal_Rela
*a
= (const Elf_Internal_Rela
*) ap
;
9539 const Elf_Internal_Rela
*b
= (const Elf_Internal_Rela
*) bp
;
9541 if (a
->r_offset
!= b
->r_offset
)
9542 return (a
->r_offset
- b
->r_offset
);
9544 /* We don't need to sort on these criteria for correctness,
9545 but enforcing a more strict ordering prevents unstable qsort
9546 from behaving differently with different implementations.
9547 Without the code below we get correct but different results
9548 on Solaris 2.7 and 2.8. We would like to always produce the
9549 same results no matter the host. */
9551 if (a
->r_info
!= b
->r_info
)
9552 return (a
->r_info
- b
->r_info
);
9554 return (a
->r_addend
- b
->r_addend
);
9559 internal_reloc_matches (const void *ap
, const void *bp
)
9561 const Elf_Internal_Rela
*a
= (const Elf_Internal_Rela
*) ap
;
9562 const Elf_Internal_Rela
*b
= (const Elf_Internal_Rela
*) bp
;
9564 /* Check if one entry overlaps with the other; this shouldn't happen
9565 except when searching for a match. */
9566 return (a
->r_offset
- b
->r_offset
);
9570 /* Predicate function used to look up a section in a particular group. */
9573 match_section_group (bfd
*abfd ATTRIBUTE_UNUSED
, asection
*sec
, void *inf
)
9575 const char *gname
= inf
;
9576 const char *group_name
= elf_group_name (sec
);
9578 return (group_name
== gname
9579 || (group_name
!= NULL
9581 && strcmp (group_name
, gname
) == 0));
9586 xtensa_get_property_section (asection
*sec
, const char *base_name
)
9588 const char *suffix
, *group_name
;
9589 char *prop_sec_name
;
9592 group_name
= elf_group_name (sec
);
9595 suffix
= strrchr (sec
->name
, '.');
9596 if (suffix
== sec
->name
)
9598 prop_sec_name
= (char *) bfd_malloc (strlen (base_name
) + 1
9599 + (suffix
? strlen (suffix
) : 0));
9600 strcpy (prop_sec_name
, base_name
);
9602 strcat (prop_sec_name
, suffix
);
9604 else if (strncmp (sec
->name
, ".gnu.linkonce.", linkonce_len
) == 0)
9606 char *linkonce_kind
= 0;
9608 if (strcmp (base_name
, XTENSA_INSN_SEC_NAME
) == 0)
9609 linkonce_kind
= "x.";
9610 else if (strcmp (base_name
, XTENSA_LIT_SEC_NAME
) == 0)
9611 linkonce_kind
= "p.";
9612 else if (strcmp (base_name
, XTENSA_PROP_SEC_NAME
) == 0)
9613 linkonce_kind
= "prop.";
9617 prop_sec_name
= (char *) bfd_malloc (strlen (sec
->name
)
9618 + strlen (linkonce_kind
) + 1);
9619 memcpy (prop_sec_name
, ".gnu.linkonce.", linkonce_len
);
9620 strcpy (prop_sec_name
+ linkonce_len
, linkonce_kind
);
9622 suffix
= sec
->name
+ linkonce_len
;
9623 /* For backward compatibility, replace "t." instead of inserting
9624 the new linkonce_kind (but not for "prop" sections). */
9625 if (CONST_STRNEQ (suffix
, "t.") && linkonce_kind
[1] == '.')
9627 strcat (prop_sec_name
+ linkonce_len
, suffix
);
9630 prop_sec_name
= strdup (base_name
);
9632 /* Check if the section already exists. */
9633 prop_sec
= bfd_get_section_by_name_if (sec
->owner
, prop_sec_name
,
9634 match_section_group
,
9635 (void *) group_name
);
9636 /* If not, create it. */
9639 flagword flags
= (SEC_RELOC
| SEC_HAS_CONTENTS
| SEC_READONLY
);
9640 flags
|= (bfd_get_section_flags (sec
->owner
, sec
)
9641 & (SEC_LINK_ONCE
| SEC_LINK_DUPLICATES
));
9643 prop_sec
= bfd_make_section_anyway_with_flags
9644 (sec
->owner
, strdup (prop_sec_name
), flags
);
9648 elf_group_name (prop_sec
) = group_name
;
9651 free (prop_sec_name
);
9657 xtensa_get_property_predef_flags (asection
*sec
)
9659 if (CONST_STRNEQ (sec
->name
, XTENSA_INSN_SEC_NAME
)
9660 || CONST_STRNEQ (sec
->name
, ".gnu.linkonce.x."))
9661 return (XTENSA_PROP_INSN
9662 | XTENSA_PROP_INSN_NO_TRANSFORM
9663 | XTENSA_PROP_INSN_NO_REORDER
);
9665 if (xtensa_is_littable_section (sec
))
9666 return (XTENSA_PROP_LITERAL
9667 | XTENSA_PROP_INSN_NO_TRANSFORM
9668 | XTENSA_PROP_INSN_NO_REORDER
);
9674 /* Other functions called directly by the linker. */
9677 xtensa_callback_required_dependence (bfd
*abfd
,
9679 struct bfd_link_info
*link_info
,
9680 deps_callback_t callback
,
9683 Elf_Internal_Rela
*internal_relocs
;
9686 bfd_boolean ok
= TRUE
;
9687 bfd_size_type sec_size
;
9689 sec_size
= bfd_get_section_limit (abfd
, sec
);
9691 /* ".plt*" sections have no explicit relocations but they contain L32R
9692 instructions that reference the corresponding ".got.plt*" sections. */
9693 if ((sec
->flags
& SEC_LINKER_CREATED
) != 0
9694 && CONST_STRNEQ (sec
->name
, ".plt"))
9698 /* Find the corresponding ".got.plt*" section. */
9699 if (sec
->name
[4] == '\0')
9700 sgotplt
= bfd_get_section_by_name (sec
->owner
, ".got.plt");
9706 BFD_ASSERT (sec
->name
[4] == '.');
9707 chunk
= strtol (&sec
->name
[5], NULL
, 10);
9709 sprintf (got_name
, ".got.plt.%u", chunk
);
9710 sgotplt
= bfd_get_section_by_name (sec
->owner
, got_name
);
9712 BFD_ASSERT (sgotplt
);
9714 /* Assume worst-case offsets: L32R at the very end of the ".plt"
9715 section referencing a literal at the very beginning of
9716 ".got.plt". This is very close to the real dependence, anyway. */
9717 (*callback
) (sec
, sec_size
, sgotplt
, 0, closure
);
9720 internal_relocs
= retrieve_internal_relocs (abfd
, sec
,
9721 link_info
->keep_memory
);
9722 if (internal_relocs
== NULL
9723 || sec
->reloc_count
== 0)
9726 /* Cache the contents for the duration of this scan. */
9727 contents
= retrieve_contents (abfd
, sec
, link_info
->keep_memory
);
9728 if (contents
== NULL
&& sec_size
!= 0)
9734 if (!xtensa_default_isa
)
9735 xtensa_default_isa
= xtensa_isa_init (0, 0);
9737 for (i
= 0; i
< sec
->reloc_count
; i
++)
9739 Elf_Internal_Rela
*irel
= &internal_relocs
[i
];
9740 if (is_l32r_relocation (abfd
, sec
, contents
, irel
))
9743 asection
*target_sec
;
9744 bfd_vma target_offset
;
9746 r_reloc_init (&l32r_rel
, abfd
, irel
, contents
, sec_size
);
9749 /* L32Rs must be local to the input file. */
9750 if (r_reloc_is_defined (&l32r_rel
))
9752 target_sec
= r_reloc_get_section (&l32r_rel
);
9753 target_offset
= l32r_rel
.target_offset
;
9755 (*callback
) (sec
, irel
->r_offset
, target_sec
, target_offset
,
9761 release_internal_relocs (sec
, internal_relocs
);
9762 release_contents (sec
, contents
);
9766 /* The default literal sections should always be marked as "code" (i.e.,
9767 SHF_EXECINSTR). This is particularly important for the Linux kernel
9768 module loader so that the literals are not placed after the text. */
9769 static const struct bfd_elf_special_section elf_xtensa_special_sections
[] =
9771 { STRING_COMMA_LEN (".fini.literal"), 0, SHT_PROGBITS
, SHF_ALLOC
+ SHF_EXECINSTR
},
9772 { STRING_COMMA_LEN (".init.literal"), 0, SHT_PROGBITS
, SHF_ALLOC
+ SHF_EXECINSTR
},
9773 { STRING_COMMA_LEN (".literal"), 0, SHT_PROGBITS
, SHF_ALLOC
+ SHF_EXECINSTR
},
9774 { NULL
, 0, 0, 0, 0 }
9778 #define TARGET_LITTLE_SYM bfd_elf32_xtensa_le_vec
9779 #define TARGET_LITTLE_NAME "elf32-xtensa-le"
9780 #define TARGET_BIG_SYM bfd_elf32_xtensa_be_vec
9781 #define TARGET_BIG_NAME "elf32-xtensa-be"
9782 #define ELF_ARCH bfd_arch_xtensa
9784 #define ELF_MACHINE_CODE EM_XTENSA
9785 #define ELF_MACHINE_ALT1 EM_XTENSA_OLD
9788 #define ELF_MAXPAGESIZE (1 << XCHAL_MMU_MIN_PTE_PAGE_SIZE)
9789 #else /* !XCHAL_HAVE_MMU */
9790 #define ELF_MAXPAGESIZE 1
9791 #endif /* !XCHAL_HAVE_MMU */
9792 #endif /* ELF_ARCH */
9794 #define elf_backend_can_gc_sections 1
9795 #define elf_backend_can_refcount 1
9796 #define elf_backend_plt_readonly 1
9797 #define elf_backend_got_header_size 4
9798 #define elf_backend_want_dynbss 0
9799 #define elf_backend_want_got_plt 1
9801 #define elf_info_to_howto elf_xtensa_info_to_howto_rela
9803 #define bfd_elf32_bfd_merge_private_bfd_data elf_xtensa_merge_private_bfd_data
9804 #define bfd_elf32_new_section_hook elf_xtensa_new_section_hook
9805 #define bfd_elf32_bfd_print_private_bfd_data elf_xtensa_print_private_bfd_data
9806 #define bfd_elf32_bfd_relax_section elf_xtensa_relax_section
9807 #define bfd_elf32_bfd_reloc_type_lookup elf_xtensa_reloc_type_lookup
9808 #define bfd_elf32_bfd_set_private_flags elf_xtensa_set_private_flags
9810 #define elf_backend_adjust_dynamic_symbol elf_xtensa_adjust_dynamic_symbol
9811 #define elf_backend_check_relocs elf_xtensa_check_relocs
9812 #define elf_backend_create_dynamic_sections elf_xtensa_create_dynamic_sections
9813 #define elf_backend_discard_info elf_xtensa_discard_info
9814 #define elf_backend_ignore_discarded_relocs elf_xtensa_ignore_discarded_relocs
9815 #define elf_backend_final_write_processing elf_xtensa_final_write_processing
9816 #define elf_backend_finish_dynamic_sections elf_xtensa_finish_dynamic_sections
9817 #define elf_backend_finish_dynamic_symbol elf_xtensa_finish_dynamic_symbol
9818 #define elf_backend_gc_mark_hook elf_xtensa_gc_mark_hook
9819 #define elf_backend_gc_sweep_hook elf_xtensa_gc_sweep_hook
9820 #define elf_backend_grok_prstatus elf_xtensa_grok_prstatus
9821 #define elf_backend_grok_psinfo elf_xtensa_grok_psinfo
9822 #define elf_backend_hide_symbol elf_xtensa_hide_symbol
9823 #define elf_backend_object_p elf_xtensa_object_p
9824 #define elf_backend_reloc_type_class elf_xtensa_reloc_type_class
9825 #define elf_backend_relocate_section elf_xtensa_relocate_section
9826 #define elf_backend_size_dynamic_sections elf_xtensa_size_dynamic_sections
9827 #define elf_backend_special_sections elf_xtensa_special_sections
9829 #include "elf32-target.h"