1 /* MSP430-specific support for 32-bit ELF
2 Copyright (C) 2002, 2003, 2004, 2005, 2006, 2007
3 Free Software Foundation, Inc.
4 Contributed by Dmitry Diky <diwil@mail.ru>
6 This file is part of BFD, the Binary File Descriptor library.
8 This program is free software; you can redistribute it and/or modify
9 it under the terms of the GNU General Public License as published by
10 the Free Software Foundation; either version 2 of the License, or
11 (at your option) any later version.
13 This program is distributed in the hope that it will be useful,
14 but WITHOUT ANY WARRANTY; without even the implied warranty of
15 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
16 GNU General Public License for more details.
18 You should have received a copy of the GNU General Public License
19 along with this program; if not, write to the Free Software
20 Foundation, Inc., 51 Franklin Street - Fifth Floor, Boston, MA 02110-1301, USA. */
24 #include "libiberty.h"
27 #include "elf/msp430.h"
29 /* Use RELA instead of REL. */
32 static reloc_howto_type elf_msp430_howto_table
[] =
34 HOWTO (R_MSP430_NONE
, /* type */
36 2, /* size (0 = byte, 1 = short, 2 = long) */
38 FALSE
, /* pc_relative */
40 complain_overflow_bitfield
,/* complain_on_overflow */
41 bfd_elf_generic_reloc
, /* special_function */
42 "R_MSP430_NONE", /* name */
43 FALSE
, /* partial_inplace */
46 FALSE
), /* pcrel_offset */
48 HOWTO (R_MSP430_32
, /* type */
50 2, /* size (0 = byte, 1 = short, 2 = long) */
52 FALSE
, /* pc_relative */
54 complain_overflow_bitfield
,/* complain_on_overflow */
55 bfd_elf_generic_reloc
, /* special_function */
56 "R_MSP430_32", /* name */
57 FALSE
, /* partial_inplace */
58 0xffffffff, /* src_mask */
59 0xffffffff, /* dst_mask */
60 FALSE
), /* pcrel_offset */
62 /* A 13 bit PC relative relocation. */
63 HOWTO (R_MSP430_10_PCREL
, /* type */
65 1, /* size (0 = byte, 1 = short, 2 = long) */
67 TRUE
, /* pc_relative */
69 complain_overflow_bitfield
,/* complain_on_overflow */
70 bfd_elf_generic_reloc
, /* special_function */
71 "R_MSP430_13_PCREL", /* name */
72 FALSE
, /* partial_inplace */
75 TRUE
), /* pcrel_offset */
77 /* A 16 bit absolute relocation. */
78 HOWTO (R_MSP430_16
, /* type */
80 1, /* size (0 = byte, 1 = short, 2 = long) */
82 FALSE
, /* pc_relative */
84 complain_overflow_dont
,/* complain_on_overflow */
85 bfd_elf_generic_reloc
, /* special_function */
86 "R_MSP430_16", /* name */
87 FALSE
, /* partial_inplace */
89 0xffff, /* dst_mask */
90 FALSE
), /* pcrel_offset */
92 /* A 16 bit absolute relocation for command address. */
93 HOWTO (R_MSP430_16_PCREL
, /* type */
95 1, /* size (0 = byte, 1 = short, 2 = long) */
97 TRUE
, /* pc_relative */
99 complain_overflow_dont
,/* complain_on_overflow */
100 bfd_elf_generic_reloc
, /* special_function */
101 "R_MSP430_16_PCREL", /* name */
102 FALSE
, /* partial_inplace */
104 0xffff, /* dst_mask */
105 TRUE
), /* pcrel_offset */
107 /* A 16 bit absolute relocation, byte operations. */
108 HOWTO (R_MSP430_16_BYTE
, /* type */
110 1, /* size (0 = byte, 1 = short, 2 = long) */
112 FALSE
, /* pc_relative */
114 complain_overflow_dont
,/* complain_on_overflow */
115 bfd_elf_generic_reloc
, /* special_function */
116 "R_MSP430_16_BYTE", /* name */
117 FALSE
, /* partial_inplace */
118 0xffff, /* src_mask */
119 0xffff, /* dst_mask */
120 FALSE
), /* pcrel_offset */
122 /* A 16 bit absolute relocation for command address. */
123 HOWTO (R_MSP430_16_PCREL_BYTE
,/* type */
125 1, /* size (0 = byte, 1 = short, 2 = long) */
127 TRUE
, /* pc_relative */
129 complain_overflow_dont
,/* complain_on_overflow */
130 bfd_elf_generic_reloc
, /* special_function */
131 "R_MSP430_16_PCREL_BYTE",/* name */
132 FALSE
, /* partial_inplace */
133 0xffff, /* src_mask */
134 0xffff, /* dst_mask */
135 TRUE
), /* pcrel_offset */
137 /* A 13 bit PC relative relocation for complicated polymorphs. */
138 HOWTO (R_MSP430_2X_PCREL
, /* type */
140 2, /* size (0 = byte, 1 = short, 2 = long) */
142 TRUE
, /* pc_relative */
144 complain_overflow_bitfield
,/* complain_on_overflow */
145 bfd_elf_generic_reloc
, /* special_function */
146 "R_MSP430_2X_PCREL", /* name */
147 FALSE
, /* partial_inplace */
148 0xfff, /* src_mask */
149 0xfff, /* dst_mask */
150 TRUE
), /* pcrel_offset */
152 /* A 16 bit relaxable relocation for command address. */
153 HOWTO (R_MSP430_RL_PCREL
, /* type */
155 1, /* size (0 = byte, 1 = short, 2 = long) */
157 TRUE
, /* pc_relative */
159 complain_overflow_dont
,/* complain_on_overflow */
160 bfd_elf_generic_reloc
, /* special_function */
161 "R_MSP430_RL_PCREL", /* name */
162 FALSE
, /* partial_inplace */
164 0xffff, /* dst_mask */
165 TRUE
) /* pcrel_offset */
168 /* Map BFD reloc types to MSP430 ELF reloc types. */
170 struct msp430_reloc_map
172 bfd_reloc_code_real_type bfd_reloc_val
;
173 unsigned int elf_reloc_val
;
176 static const struct msp430_reloc_map msp430_reloc_map
[] =
178 {BFD_RELOC_NONE
, R_MSP430_NONE
},
179 {BFD_RELOC_32
, R_MSP430_32
},
180 {BFD_RELOC_MSP430_10_PCREL
, R_MSP430_10_PCREL
},
181 {BFD_RELOC_16
, R_MSP430_16_BYTE
},
182 {BFD_RELOC_MSP430_16_PCREL
, R_MSP430_16_PCREL
},
183 {BFD_RELOC_MSP430_16
, R_MSP430_16
},
184 {BFD_RELOC_MSP430_16_PCREL_BYTE
, R_MSP430_16_PCREL_BYTE
},
185 {BFD_RELOC_MSP430_16_BYTE
, R_MSP430_16_BYTE
},
186 {BFD_RELOC_MSP430_2X_PCREL
, R_MSP430_2X_PCREL
},
187 {BFD_RELOC_MSP430_RL_PCREL
, R_MSP430_RL_PCREL
}
190 static reloc_howto_type
*
191 bfd_elf32_bfd_reloc_type_lookup (bfd
* abfd ATTRIBUTE_UNUSED
,
192 bfd_reloc_code_real_type code
)
196 for (i
= 0; i
< ARRAY_SIZE (msp430_reloc_map
); i
++)
197 if (msp430_reloc_map
[i
].bfd_reloc_val
== code
)
198 return &elf_msp430_howto_table
[msp430_reloc_map
[i
].elf_reloc_val
];
203 /* Set the howto pointer for an MSP430 ELF reloc. */
206 msp430_info_to_howto_rela (bfd
* abfd ATTRIBUTE_UNUSED
,
208 Elf_Internal_Rela
* dst
)
212 r_type
= ELF32_R_TYPE (dst
->r_info
);
213 BFD_ASSERT (r_type
< (unsigned int) R_MSP430_max
);
214 cache_ptr
->howto
= &elf_msp430_howto_table
[r_type
];
217 /* Look through the relocs for a section during the first phase.
218 Since we don't do .gots or .plts, we just need to consider the
219 virtual table relocs for gc. */
222 elf32_msp430_check_relocs (bfd
* abfd
, struct bfd_link_info
* info
,
223 asection
* sec
, const Elf_Internal_Rela
* relocs
)
225 Elf_Internal_Shdr
*symtab_hdr
;
226 struct elf_link_hash_entry
**sym_hashes
, **sym_hashes_end
;
227 const Elf_Internal_Rela
*rel
;
228 const Elf_Internal_Rela
*rel_end
;
230 if (info
->relocatable
)
233 symtab_hdr
= &elf_tdata (abfd
)->symtab_hdr
;
234 sym_hashes
= elf_sym_hashes (abfd
);
236 sym_hashes
+ symtab_hdr
->sh_size
/ sizeof (Elf32_External_Sym
);
237 if (!elf_bad_symtab (abfd
))
238 sym_hashes_end
-= symtab_hdr
->sh_info
;
240 rel_end
= relocs
+ sec
->reloc_count
;
241 for (rel
= relocs
; rel
< rel_end
; rel
++)
243 struct elf_link_hash_entry
*h
;
244 unsigned long r_symndx
;
246 r_symndx
= ELF32_R_SYM (rel
->r_info
);
247 if (r_symndx
< symtab_hdr
->sh_info
)
251 h
= sym_hashes
[r_symndx
- symtab_hdr
->sh_info
];
252 while (h
->root
.type
== bfd_link_hash_indirect
253 || h
->root
.type
== bfd_link_hash_warning
)
254 h
= (struct elf_link_hash_entry
*) h
->root
.u
.i
.link
;
261 /* Perform a single relocation. By default we use the standard BFD
262 routines, but a few relocs, we have to do them ourselves. */
264 static bfd_reloc_status_type
265 msp430_final_link_relocate (reloc_howto_type
* howto
, bfd
* input_bfd
,
266 asection
* input_section
, bfd_byte
* contents
,
267 Elf_Internal_Rela
* rel
, bfd_vma relocation
)
269 bfd_reloc_status_type r
= bfd_reloc_ok
;
275 case R_MSP430_10_PCREL
:
276 contents
+= rel
->r_offset
;
277 srel
= (bfd_signed_vma
) relocation
;
278 srel
+= rel
->r_addend
;
279 srel
-= rel
->r_offset
;
280 srel
-= 2; /* Branch instructions add 2 to the PC... */
281 srel
-= (input_section
->output_section
->vma
+
282 input_section
->output_offset
);
285 return bfd_reloc_outofrange
;
287 /* MSP430 addresses commands as words. */
290 /* Check for an overflow. */
291 if (srel
< -512 || srel
> 511)
292 return bfd_reloc_overflow
;
294 x
= bfd_get_16 (input_bfd
, contents
);
295 x
= (x
& 0xfc00) | (srel
& 0x3ff);
296 bfd_put_16 (input_bfd
, x
, contents
);
299 case R_MSP430_2X_PCREL
:
300 contents
+= rel
->r_offset
;
301 srel
= (bfd_signed_vma
) relocation
;
302 srel
+= rel
->r_addend
;
303 srel
-= rel
->r_offset
;
304 srel
-= 2; /* Branch instructions add 2 to the PC... */
305 srel
-= (input_section
->output_section
->vma
+
306 input_section
->output_offset
);
309 return bfd_reloc_outofrange
;
311 /* MSP430 addresses commands as words. */
314 /* Check for an overflow. */
315 if (srel
< -512 || srel
> 511)
316 return bfd_reloc_overflow
;
318 x
= bfd_get_16 (input_bfd
, contents
);
319 x
= (x
& 0xfc00) | (srel
& 0x3ff);
320 bfd_put_16 (input_bfd
, x
, contents
);
321 /* Handle second jump instruction. */
322 x
= bfd_get_16 (input_bfd
, contents
- 2);
324 x
= (x
& 0xfc00) | (srel
& 0x3ff);
325 bfd_put_16 (input_bfd
, x
, contents
- 2);
328 case R_MSP430_16_PCREL
:
329 case R_MSP430_RL_PCREL
:
330 contents
+= rel
->r_offset
;
331 srel
= (bfd_signed_vma
) relocation
;
332 srel
+= rel
->r_addend
;
333 srel
-= rel
->r_offset
;
334 /* Only branch instructions add 2 to the PC... */
335 srel
-= (input_section
->output_section
->vma
+
336 input_section
->output_offset
);
339 return bfd_reloc_outofrange
;
341 bfd_put_16 (input_bfd
, srel
& 0xffff, contents
);
344 case R_MSP430_16_PCREL_BYTE
:
345 contents
+= rel
->r_offset
;
346 srel
= (bfd_signed_vma
) relocation
;
347 srel
+= rel
->r_addend
;
348 srel
-= rel
->r_offset
;
349 /* Only branch instructions add 2 to the PC... */
350 srel
-= (input_section
->output_section
->vma
+
351 input_section
->output_offset
);
353 bfd_put_16 (input_bfd
, srel
& 0xffff, contents
);
356 case R_MSP430_16_BYTE
:
357 contents
+= rel
->r_offset
;
358 srel
= (bfd_signed_vma
) relocation
;
359 srel
+= rel
->r_addend
;
360 bfd_put_16 (input_bfd
, srel
& 0xffff, contents
);
364 contents
+= rel
->r_offset
;
365 srel
= (bfd_signed_vma
) relocation
;
366 srel
+= rel
->r_addend
;
369 return bfd_reloc_notsupported
;
371 bfd_put_16 (input_bfd
, srel
& 0xffff, contents
);
375 r
= _bfd_final_link_relocate (howto
, input_bfd
, input_section
,
376 contents
, rel
->r_offset
,
377 relocation
, rel
->r_addend
);
383 /* Relocate an MSP430 ELF section. */
386 elf32_msp430_relocate_section (bfd
* output_bfd ATTRIBUTE_UNUSED
,
387 struct bfd_link_info
* info
,
389 asection
* input_section
,
391 Elf_Internal_Rela
* relocs
,
392 Elf_Internal_Sym
* local_syms
,
393 asection
** local_sections
)
395 Elf_Internal_Shdr
*symtab_hdr
;
396 struct elf_link_hash_entry
**sym_hashes
;
397 Elf_Internal_Rela
*rel
;
398 Elf_Internal_Rela
*relend
;
400 symtab_hdr
= &elf_tdata (input_bfd
)->symtab_hdr
;
401 sym_hashes
= elf_sym_hashes (input_bfd
);
402 relend
= relocs
+ input_section
->reloc_count
;
404 for (rel
= relocs
; rel
< relend
; rel
++)
406 reloc_howto_type
*howto
;
407 unsigned long r_symndx
;
408 Elf_Internal_Sym
*sym
;
410 struct elf_link_hash_entry
*h
;
412 bfd_reloc_status_type r
;
413 const char *name
= NULL
;
416 r_type
= ELF32_R_TYPE (rel
->r_info
);
417 r_symndx
= ELF32_R_SYM (rel
->r_info
);
418 howto
= elf_msp430_howto_table
+ ELF32_R_TYPE (rel
->r_info
);
423 if (r_symndx
< symtab_hdr
->sh_info
)
425 sym
= local_syms
+ r_symndx
;
426 sec
= local_sections
[r_symndx
];
427 relocation
= _bfd_elf_rela_local_sym (output_bfd
, sym
, &sec
, rel
);
429 name
= bfd_elf_string_from_elf_section
430 (input_bfd
, symtab_hdr
->sh_link
, sym
->st_name
);
431 name
= (name
== NULL
) ? bfd_section_name (input_bfd
, sec
) : name
;
435 bfd_boolean unresolved_reloc
, warned
;
437 RELOC_FOR_GLOBAL_SYMBOL (info
, input_bfd
, input_section
, rel
,
438 r_symndx
, symtab_hdr
, sym_hashes
,
440 unresolved_reloc
, warned
);
443 if (sec
!= NULL
&& elf_discarded_section (sec
))
445 /* For relocs against symbols from removed linkonce sections,
446 or sections discarded by a linker script, we just want the
447 section contents zeroed. Avoid any special processing. */
448 _bfd_clear_contents (howto
, input_bfd
, contents
+ rel
->r_offset
);
454 if (info
->relocatable
)
457 r
= msp430_final_link_relocate (howto
, input_bfd
, input_section
,
458 contents
, rel
, relocation
);
460 if (r
!= bfd_reloc_ok
)
462 const char *msg
= (const char *) NULL
;
466 case bfd_reloc_overflow
:
467 r
= info
->callbacks
->reloc_overflow
468 (info
, (h
? &h
->root
: NULL
), name
, howto
->name
,
469 (bfd_vma
) 0, input_bfd
, input_section
,
473 case bfd_reloc_undefined
:
474 r
= info
->callbacks
->undefined_symbol
475 (info
, name
, input_bfd
, input_section
, rel
->r_offset
, TRUE
);
478 case bfd_reloc_outofrange
:
479 msg
= _("internal error: out of range error");
482 case bfd_reloc_notsupported
:
483 msg
= _("internal error: unsupported relocation error");
486 case bfd_reloc_dangerous
:
487 msg
= _("internal error: dangerous relocation");
491 msg
= _("internal error: unknown error");
496 r
= info
->callbacks
->warning
497 (info
, msg
, name
, input_bfd
, input_section
, rel
->r_offset
);
508 /* The final processing done just before writing out a MSP430 ELF object
509 file. This gets the MSP430 architecture right based on the machine
513 bfd_elf_msp430_final_write_processing (bfd
* abfd
,
514 bfd_boolean linker ATTRIBUTE_UNUSED
)
518 switch (bfd_get_mach (abfd
))
521 case bfd_mach_msp110
:
522 val
= E_MSP430_MACH_MSP430x11x1
;
526 val
= E_MSP430_MACH_MSP430x11
;
530 val
= E_MSP430_MACH_MSP430x12
;
534 val
= E_MSP430_MACH_MSP430x13
;
538 val
= E_MSP430_MACH_MSP430x14
;
542 val
= E_MSP430_MACH_MSP430x15
;
546 val
= E_MSP430_MACH_MSP430x16
;
550 val
= E_MSP430_MACH_MSP430x31
;
554 val
= E_MSP430_MACH_MSP430x32
;
558 val
= E_MSP430_MACH_MSP430x33
;
562 val
= E_MSP430_MACH_MSP430x41
;
566 val
= E_MSP430_MACH_MSP430x42
;
570 val
= E_MSP430_MACH_MSP430x43
;
574 val
= E_MSP430_MACH_MSP430x44
;
578 elf_elfheader (abfd
)->e_machine
= EM_MSP430
;
579 elf_elfheader (abfd
)->e_flags
&= ~EF_MSP430_MACH
;
580 elf_elfheader (abfd
)->e_flags
|= val
;
583 /* Set the right machine number. */
586 elf32_msp430_object_p (bfd
* abfd
)
588 int e_set
= bfd_mach_msp14
;
590 if (elf_elfheader (abfd
)->e_machine
== EM_MSP430
591 || elf_elfheader (abfd
)->e_machine
== EM_MSP430_OLD
)
593 int e_mach
= elf_elfheader (abfd
)->e_flags
& EF_MSP430_MACH
;
598 case E_MSP430_MACH_MSP430x11
:
599 e_set
= bfd_mach_msp11
;
602 case E_MSP430_MACH_MSP430x11x1
:
603 e_set
= bfd_mach_msp110
;
606 case E_MSP430_MACH_MSP430x12
:
607 e_set
= bfd_mach_msp12
;
610 case E_MSP430_MACH_MSP430x13
:
611 e_set
= bfd_mach_msp13
;
614 case E_MSP430_MACH_MSP430x14
:
615 e_set
= bfd_mach_msp14
;
618 case E_MSP430_MACH_MSP430x15
:
619 e_set
= bfd_mach_msp15
;
622 case E_MSP430_MACH_MSP430x16
:
623 e_set
= bfd_mach_msp16
;
626 case E_MSP430_MACH_MSP430x31
:
627 e_set
= bfd_mach_msp31
;
630 case E_MSP430_MACH_MSP430x32
:
631 e_set
= bfd_mach_msp32
;
634 case E_MSP430_MACH_MSP430x33
:
635 e_set
= bfd_mach_msp33
;
638 case E_MSP430_MACH_MSP430x41
:
639 e_set
= bfd_mach_msp41
;
642 case E_MSP430_MACH_MSP430x42
:
643 e_set
= bfd_mach_msp42
;
646 case E_MSP430_MACH_MSP430x43
:
647 e_set
= bfd_mach_msp43
;
650 case E_MSP430_MACH_MSP430x44
:
651 e_set
= bfd_mach_msp44
;
656 return bfd_default_set_arch_mach (abfd
, bfd_arch_msp430
, e_set
);
660 elf32_msp430_post_process_headers (bfd
* abfd
,
661 struct bfd_link_info
* link_info ATTRIBUTE_UNUSED
)
663 Elf_Internal_Ehdr
* i_ehdrp
; /* ELF file header, internal form. */
665 i_ehdrp
= elf_elfheader (abfd
);
667 #ifndef ELFOSABI_STANDALONE
668 #define ELFOSABI_STANDALONE 255
671 i_ehdrp
->e_ident
[EI_OSABI
] = ELFOSABI_STANDALONE
;
674 /* These functions handle relaxing for the msp430.
675 Relaxation required only in two cases:
676 - Bad hand coding like jumps from one section to another or
678 - Sibling calls. This will affect onlu 'jump label' polymorph. Without
679 relaxing this enlarges code by 2 bytes. Sibcalls implemented but
680 do not work in gcc's port by the reason I do not know.
681 Anyway, if a relaxation required, user should pass -relax option to the
684 There are quite a few relaxing opportunities available on the msp430:
686 ================================================================
690 eq == jeq label jne +4; br lab
691 ne != jne label jeq +4; br lab
692 lt < jl label jge +4; br lab
693 ltu < jlo label lhs +4; br lab
694 ge >= jge label jl +4; br lab
695 geu >= jhs label jlo +4; br lab
699 ltn < jn jn +2; jmp +4; br lab
701 3. 4 words -> 2 words
703 gt > jeq +2; jge label jeq +6; jl +4; br label
704 gtu > jeq +2; jhs label jeq +6; jlo +4; br label
706 4. 4 words -> 2 words and 2 labels
708 leu <= jeq label; jlo label jeq +2; jhs +4; br label
709 le <= jeq label; jl label jeq +2; jge +4; br label
710 =================================================================
712 codemap for first cases is (labels masked ):
713 eq: 0x2002,0x4010,0x0000 -> 0x2400
714 ne: 0x2402,0x4010,0x0000 -> 0x2000
715 lt: 0x3402,0x4010,0x0000 -> 0x3800
716 ltu: 0x2c02,0x4010,0x0000 -> 0x2800
717 ge: 0x3802,0x4010,0x0000 -> 0x3400
718 geu: 0x2802,0x4010,0x0000 -> 0x2c00
721 ltn: 0x3001,0x3c02,0x4010,0x0000 -> 0x3000
724 gt: 0x2403,0x3802,0x4010,0x0000 -> 0x2401,0x3400
725 gtu: 0x2403,0x2802,0x4010,0x0000 -> 0x2401,0x2c00
728 leu: 0x2401,0x2c02,0x4010,0x0000 -> 0x2400,0x2800
729 le: 0x2401,0x3402,0x4010,0x0000 -> 0x2400,0x3800
732 jump: 0x4010,0x0000 -> 0x3c00. */
734 #define NUMB_RELAX_CODES 12
735 static struct rcodes_s
737 int f0
, f1
; /* From code. */
738 int t0
, t1
; /* To code. */
739 int labels
; /* Position of labels: 1 - one label at first
740 word, 2 - one at second word, 3 - two
742 int cdx
; /* Words to match. */
743 int bs
; /* Shrink bytes. */
744 int off
; /* Offset from old label for new code. */
745 int ncl
; /* New code length. */
747 {/* lab,cdx,bs,off,ncl */
748 { 0x0000, 0x0000, 0x3c00, 0x0000, 1, 0, 2, 2, 2}, /* jump */
749 { 0x0000, 0x2002, 0x2400, 0x0000, 1, 1, 4, 4, 2}, /* eq */
750 { 0x0000, 0x2402, 0x2000, 0x0000, 1, 1, 4, 4, 2}, /* ne */
751 { 0x0000, 0x3402, 0x3800, 0x0000, 1, 1, 4, 4, 2}, /* lt */
752 { 0x0000, 0x2c02, 0x2800, 0x0000, 1, 1, 4, 4, 2}, /* ltu */
753 { 0x0000, 0x3802, 0x3400, 0x0000, 1, 1, 4, 4, 2}, /* ge */
754 { 0x0000, 0x2802, 0x2c00, 0x0000, 1, 1, 4, 4, 2}, /* geu */
755 { 0x3001, 0x3c02, 0x3000, 0x0000, 1, 2, 6, 6, 2}, /* ltn */
756 { 0x2403, 0x3802, 0x2401, 0x3400, 2, 2, 4, 6, 4}, /* gt */
757 { 0x2403, 0x2802, 0x2401, 0x2c00, 2, 2, 4, 6, 4}, /* gtu */
758 { 0x2401, 0x2c02, 0x2400, 0x2800, 3, 2, 4, 6, 4}, /* leu , 2 labels */
759 { 0x2401, 0x2c02, 0x2400, 0x2800, 3, 2, 4, 6, 4}, /* le , 2 labels */
760 { 0, 0, 0, 0, 0, 0, 0, 0, 0}
763 /* Return TRUE if a symbol exists at the given address. */
766 msp430_elf_symbol_address_p (bfd
* abfd
,
768 Elf_Internal_Sym
* isym
,
771 Elf_Internal_Shdr
*symtab_hdr
;
772 unsigned int sec_shndx
;
773 Elf_Internal_Sym
*isymend
;
774 struct elf_link_hash_entry
**sym_hashes
;
775 struct elf_link_hash_entry
**end_hashes
;
776 unsigned int symcount
;
778 sec_shndx
= _bfd_elf_section_from_bfd_section (abfd
, sec
);
780 /* Examine all the local symbols. */
781 symtab_hdr
= &elf_tdata (abfd
)->symtab_hdr
;
782 for (isymend
= isym
+ symtab_hdr
->sh_info
; isym
< isymend
; isym
++)
783 if (isym
->st_shndx
== sec_shndx
&& isym
->st_value
== addr
)
786 symcount
= (symtab_hdr
->sh_size
/ sizeof (Elf32_External_Sym
)
787 - symtab_hdr
->sh_info
);
788 sym_hashes
= elf_sym_hashes (abfd
);
789 end_hashes
= sym_hashes
+ symcount
;
790 for (; sym_hashes
< end_hashes
; sym_hashes
++)
792 struct elf_link_hash_entry
*sym_hash
= *sym_hashes
;
794 if ((sym_hash
->root
.type
== bfd_link_hash_defined
795 || sym_hash
->root
.type
== bfd_link_hash_defweak
)
796 && sym_hash
->root
.u
.def
.section
== sec
797 && sym_hash
->root
.u
.def
.value
== addr
)
804 /* Adjust all local symbols defined as '.section + 0xXXXX' (.section has sec_shndx)
805 referenced from current and other sections */
807 msp430_elf_relax_adjust_locals(bfd
* abfd
, asection
* sec
, bfd_vma addr
,
808 int count
, unsigned int sec_shndx
, bfd_vma toaddr
)
810 Elf_Internal_Shdr
*symtab_hdr
;
811 Elf_Internal_Rela
*irel
;
812 Elf_Internal_Rela
*irelend
;
813 Elf_Internal_Sym
*isym
;
815 irel
= elf_section_data (sec
)->relocs
;
816 irelend
= irel
+ sec
->reloc_count
;
817 symtab_hdr
= & elf_tdata (abfd
)->symtab_hdr
;
818 isym
= (Elf_Internal_Sym
*) symtab_hdr
->contents
;
820 for (irel
= elf_section_data (sec
)->relocs
; irel
< irelend
; irel
++)
822 int sidx
= ELF32_R_SYM(irel
->r_info
);
823 Elf_Internal_Sym
*lsym
= isym
+ sidx
;
825 /* Adjust symbols referenced by .sec+0xXX */
826 if (irel
->r_addend
> addr
&& irel
->r_addend
< toaddr
827 && lsym
->st_shndx
== sec_shndx
)
828 irel
->r_addend
-= count
;
834 /* Delete some bytes from a section while relaxing. */
837 msp430_elf_relax_delete_bytes (bfd
* abfd
, asection
* sec
, bfd_vma addr
,
840 Elf_Internal_Shdr
*symtab_hdr
;
841 unsigned int sec_shndx
;
843 Elf_Internal_Rela
*irel
;
844 Elf_Internal_Rela
*irelend
;
845 Elf_Internal_Rela
*irelalign
;
847 Elf_Internal_Sym
*isym
;
848 Elf_Internal_Sym
*isymend
;
849 struct elf_link_hash_entry
**sym_hashes
;
850 struct elf_link_hash_entry
**end_hashes
;
851 unsigned int symcount
;
854 sec_shndx
= _bfd_elf_section_from_bfd_section (abfd
, sec
);
856 contents
= elf_section_data (sec
)->this_hdr
.contents
;
858 /* The deletion must stop at the next ALIGN reloc for an aligment
859 power larger than the number of bytes we are deleting. */
864 irel
= elf_section_data (sec
)->relocs
;
865 irelend
= irel
+ sec
->reloc_count
;
867 /* Actually delete the bytes. */
868 memmove (contents
+ addr
, contents
+ addr
+ count
,
869 (size_t) (toaddr
- addr
- count
));
872 /* Adjust all the relocs. */
873 symtab_hdr
= & elf_tdata (abfd
)->symtab_hdr
;
874 isym
= (Elf_Internal_Sym
*) symtab_hdr
->contents
;
875 for (irel
= elf_section_data (sec
)->relocs
; irel
< irelend
; irel
++)
877 /* Get the new reloc address. */
878 if ((irel
->r_offset
> addr
&& irel
->r_offset
< toaddr
))
879 irel
->r_offset
-= count
;
882 for (p
= abfd
->sections
; p
!= NULL
; p
= p
->next
)
883 msp430_elf_relax_adjust_locals(abfd
,p
,addr
,count
,sec_shndx
,toaddr
);
885 /* Adjust the local symbols defined in this section. */
886 symtab_hdr
= & elf_tdata (abfd
)->symtab_hdr
;
887 isym
= (Elf_Internal_Sym
*) symtab_hdr
->contents
;
888 for (isymend
= isym
+ symtab_hdr
->sh_info
; isym
< isymend
; isym
++)
889 if (isym
->st_shndx
== sec_shndx
890 && isym
->st_value
> addr
&& isym
->st_value
< toaddr
)
891 isym
->st_value
-= count
;
893 /* Now adjust the global symbols defined in this section. */
894 symcount
= (symtab_hdr
->sh_size
/ sizeof (Elf32_External_Sym
)
895 - symtab_hdr
->sh_info
);
896 sym_hashes
= elf_sym_hashes (abfd
);
897 end_hashes
= sym_hashes
+ symcount
;
898 for (; sym_hashes
< end_hashes
; sym_hashes
++)
900 struct elf_link_hash_entry
*sym_hash
= *sym_hashes
;
902 if ((sym_hash
->root
.type
== bfd_link_hash_defined
903 || sym_hash
->root
.type
== bfd_link_hash_defweak
)
904 && sym_hash
->root
.u
.def
.section
== sec
905 && sym_hash
->root
.u
.def
.value
> addr
906 && sym_hash
->root
.u
.def
.value
< toaddr
)
907 sym_hash
->root
.u
.def
.value
-= count
;
915 msp430_elf_relax_section (bfd
* abfd
, asection
* sec
,
916 struct bfd_link_info
* link_info
,
919 Elf_Internal_Shdr
* symtab_hdr
;
920 Elf_Internal_Rela
* internal_relocs
;
921 Elf_Internal_Rela
* irel
;
922 Elf_Internal_Rela
* irelend
;
923 bfd_byte
* contents
= NULL
;
924 Elf_Internal_Sym
* isymbuf
= NULL
;
926 /* Assume nothing changes. */
929 /* We don't have to do anything for a relocatable link, if
930 this section does not have relocs, or if this is not a
932 if (link_info
->relocatable
933 || (sec
->flags
& SEC_RELOC
) == 0
934 || sec
->reloc_count
== 0 || (sec
->flags
& SEC_CODE
) == 0)
937 symtab_hdr
= & elf_tdata (abfd
)->symtab_hdr
;
939 /* Get a copy of the native relocations. */
941 _bfd_elf_link_read_relocs (abfd
, sec
, NULL
, NULL
, link_info
->keep_memory
);
942 if (internal_relocs
== NULL
)
945 /* Walk through them looking for relaxing opportunities. */
946 irelend
= internal_relocs
+ sec
->reloc_count
;
947 for (irel
= internal_relocs
; irel
< irelend
; irel
++)
951 /* If this isn't something that can be relaxed, then ignore
953 if (ELF32_R_TYPE (irel
->r_info
) != (int) R_MSP430_RL_PCREL
)
956 /* Get the section contents if we haven't done so already. */
957 if (contents
== NULL
)
959 /* Get cached copy if it exists. */
960 if (elf_section_data (sec
)->this_hdr
.contents
!= NULL
)
961 contents
= elf_section_data (sec
)->this_hdr
.contents
;
962 else if (! bfd_malloc_and_get_section (abfd
, sec
, &contents
))
966 /* Read this BFD's local symbols if we haven't done so already. */
967 if (isymbuf
== NULL
&& symtab_hdr
->sh_info
!= 0)
969 isymbuf
= (Elf_Internal_Sym
*) symtab_hdr
->contents
;
971 isymbuf
= bfd_elf_get_elf_syms (abfd
, symtab_hdr
,
972 symtab_hdr
->sh_info
, 0,
978 /* Get the value of the symbol referred to by the reloc. */
979 if (ELF32_R_SYM (irel
->r_info
) < symtab_hdr
->sh_info
)
981 /* A local symbol. */
982 Elf_Internal_Sym
*isym
;
985 isym
= isymbuf
+ ELF32_R_SYM (irel
->r_info
);
986 if (isym
->st_shndx
== SHN_UNDEF
)
987 sym_sec
= bfd_und_section_ptr
;
988 else if (isym
->st_shndx
== SHN_ABS
)
989 sym_sec
= bfd_abs_section_ptr
;
990 else if (isym
->st_shndx
== SHN_COMMON
)
991 sym_sec
= bfd_com_section_ptr
;
993 sym_sec
= bfd_section_from_elf_index (abfd
, isym
->st_shndx
);
994 symval
= (isym
->st_value
995 + sym_sec
->output_section
->vma
+ sym_sec
->output_offset
);
1000 struct elf_link_hash_entry
*h
;
1002 /* An external symbol. */
1003 indx
= ELF32_R_SYM (irel
->r_info
) - symtab_hdr
->sh_info
;
1004 h
= elf_sym_hashes (abfd
)[indx
];
1005 BFD_ASSERT (h
!= NULL
);
1007 if (h
->root
.type
!= bfd_link_hash_defined
1008 && h
->root
.type
!= bfd_link_hash_defweak
)
1009 /* This appears to be a reference to an undefined
1010 symbol. Just ignore it--it will be caught by the
1011 regular reloc processing. */
1014 symval
= (h
->root
.u
.def
.value
1015 + h
->root
.u
.def
.section
->output_section
->vma
1016 + h
->root
.u
.def
.section
->output_offset
);
1019 /* For simplicity of coding, we are going to modify the section
1020 contents, the section relocs, and the BFD symbol table. We
1021 must tell the rest of the code not to free up this
1022 information. It would be possible to instead create a table
1023 of changes which have to be made, as is done in coff-mips.c;
1024 that would be more work, but would require less memory when
1025 the linker is run. */
1027 /* Try to turn a 16bit pc-relative branch into a 10bit pc-relative
1029 /* Paranoia? paranoia... */
1030 if (ELF32_R_TYPE (irel
->r_info
) == (int) R_MSP430_RL_PCREL
)
1032 bfd_vma value
= symval
;
1034 /* Deal with pc-relative gunk. */
1035 value
-= (sec
->output_section
->vma
+ sec
->output_offset
);
1036 value
-= irel
->r_offset
;
1037 value
+= irel
->r_addend
;
1039 /* See if the value will fit in 10 bits, note the high value is
1040 1016 as the target will be two bytes closer if we are
1042 if ((long) value
< 1016 && (long) value
> -1016)
1044 int code0
= 0, code1
= 0, code2
= 0;
1046 struct rcodes_s
*rx
;
1048 /* Get the opcode. */
1049 if (irel
->r_offset
>= 6)
1050 code0
= bfd_get_16 (abfd
, contents
+ irel
->r_offset
- 6);
1052 if (irel
->r_offset
>= 4)
1053 code1
= bfd_get_16 (abfd
, contents
+ irel
->r_offset
- 4);
1055 code2
= bfd_get_16 (abfd
, contents
+ irel
->r_offset
- 2);
1057 if (code2
!= 0x4010)
1060 /* Check r4 and r3. */
1061 for (i
= NUMB_RELAX_CODES
- 1; i
>= 0; i
--)
1064 if (rx
->cdx
== 2 && rx
->f0
== code0
&& rx
->f1
== code1
)
1066 else if (rx
->cdx
== 1 && rx
->f1
== code1
)
1068 else if (rx
->cdx
== 0) /* This is an unconditional jump. */
1073 .Label0: ; we do not care about this label
1075 .Label1: ; make sure there is no label here
1077 .Label2: ; make sure there is no label here
1080 So, if there is .Label1 or .Label2 we cannot relax this code.
1081 This actually should not happen, cause for relaxable
1082 instructions we use RL_PCREL reloc instead of 16_PCREL.
1083 Will change this in the future. */
1086 && msp430_elf_symbol_address_p (abfd
, sec
, isymbuf
,
1087 irel
->r_offset
- 2))
1090 && msp430_elf_symbol_address_p (abfd
, sec
, isymbuf
,
1091 irel
->r_offset
- 4))
1094 /* Note that we've changed the relocs, section contents, etc. */
1095 elf_section_data (sec
)->relocs
= internal_relocs
;
1096 elf_section_data (sec
)->this_hdr
.contents
= contents
;
1097 symtab_hdr
->contents
= (unsigned char *) isymbuf
;
1099 /* Fix the relocation's type. */
1100 if (rx
->labels
== 3) /* Handle special cases. */
1101 irel
->r_info
= ELF32_R_INFO (ELF32_R_SYM (irel
->r_info
),
1104 irel
->r_info
= ELF32_R_INFO (ELF32_R_SYM (irel
->r_info
),
1107 /* Fix the opcode right way. */
1108 bfd_put_16 (abfd
, rx
->t0
, contents
+ irel
->r_offset
- rx
->off
);
1110 bfd_put_16 (abfd
, rx
->t1
,
1111 contents
+ irel
->r_offset
- rx
->off
+ 2);
1114 if (!msp430_elf_relax_delete_bytes (abfd
, sec
,
1115 irel
->r_offset
- rx
->off
+
1119 /* Handle unconditional jumps. */
1121 irel
->r_offset
-= 2;
1123 /* That will change things, so, we should relax again.
1124 Note that this is not required, and it may be slow. */
1130 if (isymbuf
!= NULL
&& symtab_hdr
->contents
!= (unsigned char *) isymbuf
)
1132 if (!link_info
->keep_memory
)
1136 /* Cache the symbols for elf_link_input_bfd. */
1137 symtab_hdr
->contents
= (unsigned char *) isymbuf
;
1141 if (contents
!= NULL
1142 && elf_section_data (sec
)->this_hdr
.contents
!= contents
)
1144 if (!link_info
->keep_memory
)
1148 /* Cache the section contents for elf_link_input_bfd. */
1149 elf_section_data (sec
)->this_hdr
.contents
= contents
;
1153 if (internal_relocs
!= NULL
1154 && elf_section_data (sec
)->relocs
!= internal_relocs
)
1155 free (internal_relocs
);
1160 if (isymbuf
!= NULL
&& symtab_hdr
->contents
!= (unsigned char *) isymbuf
)
1162 if (contents
!= NULL
1163 && elf_section_data (sec
)->this_hdr
.contents
!= contents
)
1165 if (internal_relocs
!= NULL
1166 && elf_section_data (sec
)->relocs
!= internal_relocs
)
1167 free (internal_relocs
);
1173 #define ELF_ARCH bfd_arch_msp430
1174 #define ELF_MACHINE_CODE EM_MSP430
1175 #define ELF_MACHINE_ALT1 EM_MSP430_OLD
1176 #define ELF_MAXPAGESIZE 1
1178 #define TARGET_LITTLE_SYM bfd_elf32_msp430_vec
1179 #define TARGET_LITTLE_NAME "elf32-msp430"
1181 #define elf_info_to_howto msp430_info_to_howto_rela
1182 #define elf_info_to_howto_rel NULL
1183 #define elf_backend_relocate_section elf32_msp430_relocate_section
1184 #define elf_backend_check_relocs elf32_msp430_check_relocs
1185 #define elf_backend_can_gc_sections 1
1186 #define elf_backend_final_write_processing bfd_elf_msp430_final_write_processing
1187 #define elf_backend_object_p elf32_msp430_object_p
1188 #define elf_backend_post_process_headers elf32_msp430_post_process_headers
1189 #define bfd_elf32_bfd_relax_section msp430_elf_relax_section
1191 #include "elf32-target.h"