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 static reloc_howto_type *
204 bfd_elf32_bfd_reloc_name_lookup (bfd *abfd ATTRIBUTE_UNUSED,
210 i < (sizeof (elf_msp430_howto_table)
211 / sizeof (elf_msp430_howto_table[0]));
213 if (elf_msp430_howto_table[i].name != NULL
214 && strcasecmp (elf_msp430_howto_table[i].name, r_name) == 0)
215 return &elf_msp430_howto_table[i];
220 /* Set the howto pointer for an MSP430 ELF reloc. */
223 msp430_info_to_howto_rela (bfd * abfd ATTRIBUTE_UNUSED,
225 Elf_Internal_Rela * dst)
229 r_type = ELF32_R_TYPE (dst->r_info);
230 BFD_ASSERT (r_type < (unsigned int) R_MSP430_max);
231 cache_ptr->howto = &elf_msp430_howto_table[r_type];
234 /* Look through the relocs for a section during the first phase.
235 Since we don't do .gots or .plts, we just need to consider the
236 virtual table relocs for gc. */
239 elf32_msp430_check_relocs (bfd * abfd, struct bfd_link_info * info,
240 asection * sec, const Elf_Internal_Rela * relocs)
242 Elf_Internal_Shdr *symtab_hdr;
243 struct elf_link_hash_entry **sym_hashes, **sym_hashes_end;
244 const Elf_Internal_Rela *rel;
245 const Elf_Internal_Rela *rel_end;
247 if (info->relocatable)
250 symtab_hdr = &elf_tdata (abfd)->symtab_hdr;
251 sym_hashes = elf_sym_hashes (abfd);
253 sym_hashes + symtab_hdr->sh_size / sizeof (Elf32_External_Sym);
254 if (!elf_bad_symtab (abfd))
255 sym_hashes_end -= symtab_hdr->sh_info;
257 rel_end = relocs + sec->reloc_count;
258 for (rel = relocs; rel < rel_end; rel++)
260 struct elf_link_hash_entry *h;
261 unsigned long r_symndx;
263 r_symndx = ELF32_R_SYM (rel->r_info);
264 if (r_symndx < symtab_hdr->sh_info)
268 h = sym_hashes[r_symndx - symtab_hdr->sh_info];
269 while (h->root.type == bfd_link_hash_indirect
270 || h->root.type == bfd_link_hash_warning)
271 h = (struct elf_link_hash_entry *) h->root.u.i.link;
278 /* Perform a single relocation. By default we use the standard BFD
279 routines, but a few relocs, we have to do them ourselves. */
281 static bfd_reloc_status_type
282 msp430_final_link_relocate (reloc_howto_type * howto, bfd * input_bfd,
283 asection * input_section, bfd_byte * contents,
284 Elf_Internal_Rela * rel, bfd_vma relocation)
286 bfd_reloc_status_type r = bfd_reloc_ok;
292 case R_MSP430_10_PCREL:
293 contents += rel->r_offset;
294 srel = (bfd_signed_vma) relocation;
295 srel += rel->r_addend;
296 srel -= rel->r_offset;
297 srel -= 2; /* Branch instructions add 2 to the PC... */
298 srel -= (input_section->output_section->vma +
299 input_section->output_offset);
302 return bfd_reloc_outofrange;
304 /* MSP430 addresses commands as words. */
307 /* Check for an overflow. */
308 if (srel < -512 || srel > 511)
309 return bfd_reloc_overflow;
311 x = bfd_get_16 (input_bfd, contents);
312 x = (x & 0xfc00) | (srel & 0x3ff);
313 bfd_put_16 (input_bfd, x, contents);
316 case R_MSP430_2X_PCREL:
317 contents += rel->r_offset;
318 srel = (bfd_signed_vma) relocation;
319 srel += rel->r_addend;
320 srel -= rel->r_offset;
321 srel -= 2; /* Branch instructions add 2 to the PC... */
322 srel -= (input_section->output_section->vma +
323 input_section->output_offset);
326 return bfd_reloc_outofrange;
328 /* MSP430 addresses commands as words. */
331 /* Check for an overflow. */
332 if (srel < -512 || srel > 511)
333 return bfd_reloc_overflow;
335 x = bfd_get_16 (input_bfd, contents);
336 x = (x & 0xfc00) | (srel & 0x3ff);
337 bfd_put_16 (input_bfd, x, contents);
338 /* Handle second jump instruction. */
339 x = bfd_get_16 (input_bfd, contents - 2);
341 x = (x & 0xfc00) | (srel & 0x3ff);
342 bfd_put_16 (input_bfd, x, contents - 2);
345 case R_MSP430_16_PCREL:
346 case R_MSP430_RL_PCREL:
347 contents += rel->r_offset;
348 srel = (bfd_signed_vma) relocation;
349 srel += rel->r_addend;
350 srel -= rel->r_offset;
351 /* Only branch instructions add 2 to the PC... */
352 srel -= (input_section->output_section->vma +
353 input_section->output_offset);
356 return bfd_reloc_outofrange;
358 bfd_put_16 (input_bfd, srel & 0xffff, contents);
361 case R_MSP430_16_PCREL_BYTE:
362 contents += rel->r_offset;
363 srel = (bfd_signed_vma) relocation;
364 srel += rel->r_addend;
365 srel -= rel->r_offset;
366 /* Only branch instructions add 2 to the PC... */
367 srel -= (input_section->output_section->vma +
368 input_section->output_offset);
370 bfd_put_16 (input_bfd, srel & 0xffff, contents);
373 case R_MSP430_16_BYTE:
374 contents += rel->r_offset;
375 srel = (bfd_signed_vma) relocation;
376 srel += rel->r_addend;
377 bfd_put_16 (input_bfd, srel & 0xffff, contents);
381 contents += rel->r_offset;
382 srel = (bfd_signed_vma) relocation;
383 srel += rel->r_addend;
386 return bfd_reloc_notsupported;
388 bfd_put_16 (input_bfd, srel & 0xffff, contents);
392 r = _bfd_final_link_relocate (howto, input_bfd, input_section,
393 contents, rel->r_offset,
394 relocation, rel->r_addend);
400 /* Relocate an MSP430 ELF section. */
403 elf32_msp430_relocate_section (bfd * output_bfd ATTRIBUTE_UNUSED,
404 struct bfd_link_info * info,
406 asection * input_section,
408 Elf_Internal_Rela * relocs,
409 Elf_Internal_Sym * local_syms,
410 asection ** local_sections)
412 Elf_Internal_Shdr *symtab_hdr;
413 struct elf_link_hash_entry **sym_hashes;
414 Elf_Internal_Rela *rel;
415 Elf_Internal_Rela *relend;
417 symtab_hdr = &elf_tdata (input_bfd)->symtab_hdr;
418 sym_hashes = elf_sym_hashes (input_bfd);
419 relend = relocs + input_section->reloc_count;
421 for (rel = relocs; rel < relend; rel++)
423 reloc_howto_type *howto;
424 unsigned long r_symndx;
425 Elf_Internal_Sym *sym;
427 struct elf_link_hash_entry *h;
429 bfd_reloc_status_type r;
430 const char *name = NULL;
433 r_type = ELF32_R_TYPE (rel->r_info);
434 r_symndx = ELF32_R_SYM (rel->r_info);
435 howto = elf_msp430_howto_table + ELF32_R_TYPE (rel->r_info);
440 if (r_symndx < symtab_hdr->sh_info)
442 sym = local_syms + r_symndx;
443 sec = local_sections[r_symndx];
444 relocation = _bfd_elf_rela_local_sym (output_bfd, sym, &sec, rel);
446 name = bfd_elf_string_from_elf_section
447 (input_bfd, symtab_hdr->sh_link, sym->st_name);
448 name = (name == NULL) ? bfd_section_name (input_bfd, sec) : name;
452 bfd_boolean unresolved_reloc, warned;
454 RELOC_FOR_GLOBAL_SYMBOL (info, input_bfd, input_section, rel,
455 r_symndx, symtab_hdr, sym_hashes,
457 unresolved_reloc, warned);
460 if (sec != NULL && elf_discarded_section (sec))
462 /* For relocs against symbols from removed linkonce sections,
463 or sections discarded by a linker script, we just want the
464 section contents zeroed. Avoid any special processing. */
465 _bfd_clear_contents (howto, input_bfd, contents + rel->r_offset);
471 if (info->relocatable)
474 r = msp430_final_link_relocate (howto, input_bfd, input_section,
475 contents, rel, relocation);
477 if (r != bfd_reloc_ok)
479 const char *msg = (const char *) NULL;
483 case bfd_reloc_overflow:
484 r = info->callbacks->reloc_overflow
485 (info, (h ? &h->root : NULL), name, howto->name,
486 (bfd_vma) 0, input_bfd, input_section,
490 case bfd_reloc_undefined:
491 r = info->callbacks->undefined_symbol
492 (info, name, input_bfd, input_section, rel->r_offset, TRUE);
495 case bfd_reloc_outofrange:
496 msg = _("internal error: out of range error");
499 case bfd_reloc_notsupported:
500 msg = _("internal error: unsupported relocation error");
503 case bfd_reloc_dangerous:
504 msg = _("internal error: dangerous relocation");
508 msg = _("internal error: unknown error");
513 r = info->callbacks->warning
514 (info, msg, name, input_bfd, input_section, rel->r_offset);
525 /* The final processing done just before writing out a MSP430 ELF object
526 file. This gets the MSP430 architecture right based on the machine
530 bfd_elf_msp430_final_write_processing (bfd * abfd,
531 bfd_boolean linker ATTRIBUTE_UNUSED)
535 switch (bfd_get_mach (abfd))
538 case bfd_mach_msp110:
539 val = E_MSP430_MACH_MSP430x11x1;
543 val = E_MSP430_MACH_MSP430x11;
547 val = E_MSP430_MACH_MSP430x12;
551 val = E_MSP430_MACH_MSP430x13;
555 val = E_MSP430_MACH_MSP430x14;
559 val = E_MSP430_MACH_MSP430x15;
563 val = E_MSP430_MACH_MSP430x16;
567 val = E_MSP430_MACH_MSP430x31;
571 val = E_MSP430_MACH_MSP430x32;
575 val = E_MSP430_MACH_MSP430x33;
579 val = E_MSP430_MACH_MSP430x41;
583 val = E_MSP430_MACH_MSP430x42;
587 val = E_MSP430_MACH_MSP430x43;
591 val = E_MSP430_MACH_MSP430x44;
595 elf_elfheader (abfd)->e_machine = EM_MSP430;
596 elf_elfheader (abfd)->e_flags &= ~EF_MSP430_MACH;
597 elf_elfheader (abfd)->e_flags |= val;
600 /* Set the right machine number. */
603 elf32_msp430_object_p (bfd * abfd)
605 int e_set = bfd_mach_msp14;
607 if (elf_elfheader (abfd)->e_machine == EM_MSP430
608 || elf_elfheader (abfd)->e_machine == EM_MSP430_OLD)
610 int e_mach = elf_elfheader (abfd)->e_flags & EF_MSP430_MACH;
615 case E_MSP430_MACH_MSP430x11:
616 e_set = bfd_mach_msp11;
619 case E_MSP430_MACH_MSP430x11x1:
620 e_set = bfd_mach_msp110;
623 case E_MSP430_MACH_MSP430x12:
624 e_set = bfd_mach_msp12;
627 case E_MSP430_MACH_MSP430x13:
628 e_set = bfd_mach_msp13;
631 case E_MSP430_MACH_MSP430x14:
632 e_set = bfd_mach_msp14;
635 case E_MSP430_MACH_MSP430x15:
636 e_set = bfd_mach_msp15;
639 case E_MSP430_MACH_MSP430x16:
640 e_set = bfd_mach_msp16;
643 case E_MSP430_MACH_MSP430x31:
644 e_set = bfd_mach_msp31;
647 case E_MSP430_MACH_MSP430x32:
648 e_set = bfd_mach_msp32;
651 case E_MSP430_MACH_MSP430x33:
652 e_set = bfd_mach_msp33;
655 case E_MSP430_MACH_MSP430x41:
656 e_set = bfd_mach_msp41;
659 case E_MSP430_MACH_MSP430x42:
660 e_set = bfd_mach_msp42;
663 case E_MSP430_MACH_MSP430x43:
664 e_set = bfd_mach_msp43;
667 case E_MSP430_MACH_MSP430x44:
668 e_set = bfd_mach_msp44;
673 return bfd_default_set_arch_mach (abfd, bfd_arch_msp430, e_set);
676 /* These functions handle relaxing for the msp430.
677 Relaxation required only in two cases:
678 - Bad hand coding like jumps from one section to another or
680 - Sibling calls. This will affect onlu 'jump label' polymorph. Without
681 relaxing this enlarges code by 2 bytes. Sibcalls implemented but
682 do not work in gcc's port by the reason I do not know.
683 Anyway, if a relaxation required, user should pass -relax option to the
686 There are quite a few relaxing opportunities available on the msp430:
688 ================================================================
692 eq == jeq label jne +4; br lab
693 ne != jne label jeq +4; br lab
694 lt < jl label jge +4; br lab
695 ltu < jlo label lhs +4; br lab
696 ge >= jge label jl +4; br lab
697 geu >= jhs label jlo +4; br lab
701 ltn < jn jn +2; jmp +4; br lab
703 3. 4 words -> 2 words
705 gt > jeq +2; jge label jeq +6; jl +4; br label
706 gtu > jeq +2; jhs label jeq +6; jlo +4; br label
708 4. 4 words -> 2 words and 2 labels
710 leu <= jeq label; jlo label jeq +2; jhs +4; br label
711 le <= jeq label; jl label jeq +2; jge +4; br label
712 =================================================================
714 codemap for first cases is (labels masked ):
715 eq: 0x2002,0x4010,0x0000 -> 0x2400
716 ne: 0x2402,0x4010,0x0000 -> 0x2000
717 lt: 0x3402,0x4010,0x0000 -> 0x3800
718 ltu: 0x2c02,0x4010,0x0000 -> 0x2800
719 ge: 0x3802,0x4010,0x0000 -> 0x3400
720 geu: 0x2802,0x4010,0x0000 -> 0x2c00
723 ltn: 0x3001,0x3c02,0x4010,0x0000 -> 0x3000
726 gt: 0x2403,0x3802,0x4010,0x0000 -> 0x2401,0x3400
727 gtu: 0x2403,0x2802,0x4010,0x0000 -> 0x2401,0x2c00
730 leu: 0x2401,0x2c02,0x4010,0x0000 -> 0x2400,0x2800
731 le: 0x2401,0x3402,0x4010,0x0000 -> 0x2400,0x3800
734 jump: 0x4010,0x0000 -> 0x3c00. */
736 #define NUMB_RELAX_CODES 12
737 static struct rcodes_s
739 int f0, f1; /* From code. */
740 int t0, t1; /* To code. */
741 int labels; /* Position of labels: 1 - one label at first
742 word, 2 - one at second word, 3 - two
744 int cdx; /* Words to match. */
745 int bs; /* Shrink bytes. */
746 int off; /* Offset from old label for new code. */
747 int ncl; /* New code length. */
749 {/* lab,cdx,bs,off,ncl */
750 { 0x0000, 0x0000, 0x3c00, 0x0000, 1, 0, 2, 2, 2}, /* jump */
751 { 0x0000, 0x2002, 0x2400, 0x0000, 1, 1, 4, 4, 2}, /* eq */
752 { 0x0000, 0x2402, 0x2000, 0x0000, 1, 1, 4, 4, 2}, /* ne */
753 { 0x0000, 0x3402, 0x3800, 0x0000, 1, 1, 4, 4, 2}, /* lt */
754 { 0x0000, 0x2c02, 0x2800, 0x0000, 1, 1, 4, 4, 2}, /* ltu */
755 { 0x0000, 0x3802, 0x3400, 0x0000, 1, 1, 4, 4, 2}, /* ge */
756 { 0x0000, 0x2802, 0x2c00, 0x0000, 1, 1, 4, 4, 2}, /* geu */
757 { 0x3001, 0x3c02, 0x3000, 0x0000, 1, 2, 6, 6, 2}, /* ltn */
758 { 0x2403, 0x3802, 0x2401, 0x3400, 2, 2, 4, 6, 4}, /* gt */
759 { 0x2403, 0x2802, 0x2401, 0x2c00, 2, 2, 4, 6, 4}, /* gtu */
760 { 0x2401, 0x2c02, 0x2400, 0x2800, 3, 2, 4, 6, 4}, /* leu , 2 labels */
761 { 0x2401, 0x2c02, 0x2400, 0x2800, 3, 2, 4, 6, 4}, /* le , 2 labels */
762 { 0, 0, 0, 0, 0, 0, 0, 0, 0}
765 /* Return TRUE if a symbol exists at the given address. */
768 msp430_elf_symbol_address_p (bfd * abfd,
770 Elf_Internal_Sym * isym,
773 Elf_Internal_Shdr *symtab_hdr;
774 unsigned int sec_shndx;
775 Elf_Internal_Sym *isymend;
776 struct elf_link_hash_entry **sym_hashes;
777 struct elf_link_hash_entry **end_hashes;
778 unsigned int symcount;
780 sec_shndx = _bfd_elf_section_from_bfd_section (abfd, sec);
782 /* Examine all the local symbols. */
783 symtab_hdr = &elf_tdata (abfd)->symtab_hdr;
784 for (isymend = isym + symtab_hdr->sh_info; isym < isymend; isym++)
785 if (isym->st_shndx == sec_shndx && isym->st_value == addr)
788 symcount = (symtab_hdr->sh_size / sizeof (Elf32_External_Sym)
789 - symtab_hdr->sh_info);
790 sym_hashes = elf_sym_hashes (abfd);
791 end_hashes = sym_hashes + symcount;
792 for (; sym_hashes < end_hashes; sym_hashes++)
794 struct elf_link_hash_entry *sym_hash = *sym_hashes;
796 if ((sym_hash->root.type == bfd_link_hash_defined
797 || sym_hash->root.type == bfd_link_hash_defweak)
798 && sym_hash->root.u.def.section == sec
799 && sym_hash->root.u.def.value == addr)
806 /* Adjust all local symbols defined as '.section + 0xXXXX' (.section has sec_shndx)
807 referenced from current and other sections */
809 msp430_elf_relax_adjust_locals(bfd * abfd, asection * sec, bfd_vma addr,
810 int count, unsigned int sec_shndx, bfd_vma toaddr)
812 Elf_Internal_Shdr *symtab_hdr;
813 Elf_Internal_Rela *irel;
814 Elf_Internal_Rela *irelend;
815 Elf_Internal_Sym *isym;
817 irel = elf_section_data (sec)->relocs;
818 irelend = irel + sec->reloc_count;
819 symtab_hdr = & elf_tdata (abfd)->symtab_hdr;
820 isym = (Elf_Internal_Sym *) symtab_hdr->contents;
822 for (irel = elf_section_data (sec)->relocs; irel < irelend; irel++)
824 int sidx = ELF32_R_SYM(irel->r_info);
825 Elf_Internal_Sym *lsym = isym + sidx;
827 /* Adjust symbols referenced by .sec+0xXX */
828 if (irel->r_addend > addr && irel->r_addend < toaddr
829 && lsym->st_shndx == sec_shndx)
830 irel->r_addend -= count;
836 /* Delete some bytes from a section while relaxing. */
839 msp430_elf_relax_delete_bytes (bfd * abfd, asection * sec, bfd_vma addr,
842 Elf_Internal_Shdr *symtab_hdr;
843 unsigned int sec_shndx;
845 Elf_Internal_Rela *irel;
846 Elf_Internal_Rela *irelend;
847 Elf_Internal_Rela *irelalign;
849 Elf_Internal_Sym *isym;
850 Elf_Internal_Sym *isymend;
851 struct elf_link_hash_entry **sym_hashes;
852 struct elf_link_hash_entry **end_hashes;
853 unsigned int symcount;
856 sec_shndx = _bfd_elf_section_from_bfd_section (abfd, sec);
858 contents = elf_section_data (sec)->this_hdr.contents;
860 /* The deletion must stop at the next ALIGN reloc for an aligment
861 power larger than the number of bytes we are deleting. */
866 irel = elf_section_data (sec)->relocs;
867 irelend = irel + sec->reloc_count;
869 /* Actually delete the bytes. */
870 memmove (contents + addr, contents + addr + count,
871 (size_t) (toaddr - addr - count));
874 /* Adjust all the relocs. */
875 symtab_hdr = & elf_tdata (abfd)->symtab_hdr;
876 isym = (Elf_Internal_Sym *) symtab_hdr->contents;
877 for (irel = elf_section_data (sec)->relocs; irel < irelend; irel++)
879 /* Get the new reloc address. */
880 if ((irel->r_offset > addr && irel->r_offset < toaddr))
881 irel->r_offset -= count;
884 for (p = abfd->sections; p != NULL; p = p->next)
885 msp430_elf_relax_adjust_locals(abfd,p,addr,count,sec_shndx,toaddr);
887 /* Adjust the local symbols defined in this section. */
888 symtab_hdr = & elf_tdata (abfd)->symtab_hdr;
889 isym = (Elf_Internal_Sym *) symtab_hdr->contents;
890 for (isymend = isym + symtab_hdr->sh_info; isym < isymend; isym++)
891 if (isym->st_shndx == sec_shndx
892 && isym->st_value > addr && isym->st_value < toaddr)
893 isym->st_value -= count;
895 /* Now adjust the global symbols defined in this section. */
896 symcount = (symtab_hdr->sh_size / sizeof (Elf32_External_Sym)
897 - symtab_hdr->sh_info);
898 sym_hashes = elf_sym_hashes (abfd);
899 end_hashes = sym_hashes + symcount;
900 for (; sym_hashes < end_hashes; sym_hashes++)
902 struct elf_link_hash_entry *sym_hash = *sym_hashes;
904 if ((sym_hash->root.type == bfd_link_hash_defined
905 || sym_hash->root.type == bfd_link_hash_defweak)
906 && sym_hash->root.u.def.section == sec
907 && sym_hash->root.u.def.value > addr
908 && sym_hash->root.u.def.value < toaddr)
909 sym_hash->root.u.def.value -= count;
917 msp430_elf_relax_section (bfd * abfd, asection * sec,
918 struct bfd_link_info * link_info,
921 Elf_Internal_Shdr * symtab_hdr;
922 Elf_Internal_Rela * internal_relocs;
923 Elf_Internal_Rela * irel;
924 Elf_Internal_Rela * irelend;
925 bfd_byte * contents = NULL;
926 Elf_Internal_Sym * isymbuf = NULL;
928 /* Assume nothing changes. */
931 /* We don't have to do anything for a relocatable link, if
932 this section does not have relocs, or if this is not a
934 if (link_info->relocatable
935 || (sec->flags & SEC_RELOC) == 0
936 || sec->reloc_count == 0 || (sec->flags & SEC_CODE) == 0)
939 symtab_hdr = & elf_tdata (abfd)->symtab_hdr;
941 /* Get a copy of the native relocations. */
943 _bfd_elf_link_read_relocs (abfd, sec, NULL, NULL, link_info->keep_memory);
944 if (internal_relocs == NULL)
947 /* Walk through them looking for relaxing opportunities. */
948 irelend = internal_relocs + sec->reloc_count;
949 for (irel = internal_relocs; irel < irelend; irel++)
953 /* If this isn't something that can be relaxed, then ignore
955 if (ELF32_R_TYPE (irel->r_info) != (int) R_MSP430_RL_PCREL)
958 /* Get the section contents if we haven't done so already. */
959 if (contents == NULL)
961 /* Get cached copy if it exists. */
962 if (elf_section_data (sec)->this_hdr.contents != NULL)
963 contents = elf_section_data (sec)->this_hdr.contents;
964 else if (! bfd_malloc_and_get_section (abfd, sec, &contents))
968 /* Read this BFD's local symbols if we haven't done so already. */
969 if (isymbuf == NULL && symtab_hdr->sh_info != 0)
971 isymbuf = (Elf_Internal_Sym *) symtab_hdr->contents;
973 isymbuf = bfd_elf_get_elf_syms (abfd, symtab_hdr,
974 symtab_hdr->sh_info, 0,
980 /* Get the value of the symbol referred to by the reloc. */
981 if (ELF32_R_SYM (irel->r_info) < symtab_hdr->sh_info)
983 /* A local symbol. */
984 Elf_Internal_Sym *isym;
987 isym = isymbuf + ELF32_R_SYM (irel->r_info);
988 if (isym->st_shndx == SHN_UNDEF)
989 sym_sec = bfd_und_section_ptr;
990 else if (isym->st_shndx == SHN_ABS)
991 sym_sec = bfd_abs_section_ptr;
992 else if (isym->st_shndx == SHN_COMMON)
993 sym_sec = bfd_com_section_ptr;
995 sym_sec = bfd_section_from_elf_index (abfd, isym->st_shndx);
996 symval = (isym->st_value
997 + sym_sec->output_section->vma + sym_sec->output_offset);
1002 struct elf_link_hash_entry *h;
1004 /* An external symbol. */
1005 indx = ELF32_R_SYM (irel->r_info) - symtab_hdr->sh_info;
1006 h = elf_sym_hashes (abfd)[indx];
1007 BFD_ASSERT (h != NULL);
1009 if (h->root.type != bfd_link_hash_defined
1010 && h->root.type != bfd_link_hash_defweak)
1011 /* This appears to be a reference to an undefined
1012 symbol. Just ignore it--it will be caught by the
1013 regular reloc processing. */
1016 symval = (h->root.u.def.value
1017 + h->root.u.def.section->output_section->vma
1018 + h->root.u.def.section->output_offset);
1021 /* For simplicity of coding, we are going to modify the section
1022 contents, the section relocs, and the BFD symbol table. We
1023 must tell the rest of the code not to free up this
1024 information. It would be possible to instead create a table
1025 of changes which have to be made, as is done in coff-mips.c;
1026 that would be more work, but would require less memory when
1027 the linker is run. */
1029 /* Try to turn a 16bit pc-relative branch into a 10bit pc-relative
1031 /* Paranoia? paranoia... */
1032 if (ELF32_R_TYPE (irel->r_info) == (int) R_MSP430_RL_PCREL)
1034 bfd_vma value = symval;
1036 /* Deal with pc-relative gunk. */
1037 value -= (sec->output_section->vma + sec->output_offset);
1038 value -= irel->r_offset;
1039 value += irel->r_addend;
1041 /* See if the value will fit in 10 bits, note the high value is
1042 1016 as the target will be two bytes closer if we are
1044 if ((long) value < 1016 && (long) value > -1016)
1046 int code0 = 0, code1 = 0, code2 = 0;
1048 struct rcodes_s *rx;
1050 /* Get the opcode. */
1051 if (irel->r_offset >= 6)
1052 code0 = bfd_get_16 (abfd, contents + irel->r_offset - 6);
1054 if (irel->r_offset >= 4)
1055 code1 = bfd_get_16 (abfd, contents + irel->r_offset - 4);
1057 code2 = bfd_get_16 (abfd, contents + irel->r_offset - 2);
1059 if (code2 != 0x4010)
1062 /* Check r4 and r3. */
1063 for (i = NUMB_RELAX_CODES - 1; i >= 0; i--)
1066 if (rx->cdx == 2 && rx->f0 == code0 && rx->f1 == code1)
1068 else if (rx->cdx == 1 && rx->f1 == code1)
1070 else if (rx->cdx == 0) /* This is an unconditional jump. */
1075 .Label0: ; we do not care about this label
1077 .Label1: ; make sure there is no label here
1079 .Label2: ; make sure there is no label here
1082 So, if there is .Label1 or .Label2 we cannot relax this code.
1083 This actually should not happen, cause for relaxable
1084 instructions we use RL_PCREL reloc instead of 16_PCREL.
1085 Will change this in the future. */
1088 && msp430_elf_symbol_address_p (abfd, sec, isymbuf,
1089 irel->r_offset - 2))
1092 && msp430_elf_symbol_address_p (abfd, sec, isymbuf,
1093 irel->r_offset - 4))
1096 /* Note that we've changed the relocs, section contents, etc. */
1097 elf_section_data (sec)->relocs = internal_relocs;
1098 elf_section_data (sec)->this_hdr.contents = contents;
1099 symtab_hdr->contents = (unsigned char *) isymbuf;
1101 /* Fix the relocation's type. */
1102 if (rx->labels == 3) /* Handle special cases. */
1103 irel->r_info = ELF32_R_INFO (ELF32_R_SYM (irel->r_info),
1106 irel->r_info = ELF32_R_INFO (ELF32_R_SYM (irel->r_info),
1109 /* Fix the opcode right way. */
1110 bfd_put_16 (abfd, rx->t0, contents + irel->r_offset - rx->off);
1112 bfd_put_16 (abfd, rx->t1,
1113 contents + irel->r_offset - rx->off + 2);
1116 if (!msp430_elf_relax_delete_bytes (abfd, sec,
1117 irel->r_offset - rx->off +
1121 /* Handle unconditional jumps. */
1123 irel->r_offset -= 2;
1125 /* That will change things, so, we should relax again.
1126 Note that this is not required, and it may be slow. */
1132 if (isymbuf != NULL && symtab_hdr->contents != (unsigned char *) isymbuf)
1134 if (!link_info->keep_memory)
1138 /* Cache the symbols for elf_link_input_bfd. */
1139 symtab_hdr->contents = (unsigned char *) isymbuf;
1143 if (contents != NULL
1144 && elf_section_data (sec)->this_hdr.contents != contents)
1146 if (!link_info->keep_memory)
1150 /* Cache the section contents for elf_link_input_bfd. */
1151 elf_section_data (sec)->this_hdr.contents = contents;
1155 if (internal_relocs != NULL
1156 && elf_section_data (sec)->relocs != internal_relocs)
1157 free (internal_relocs);
1162 if (isymbuf != NULL && symtab_hdr->contents != (unsigned char *) isymbuf)
1164 if (contents != NULL
1165 && elf_section_data (sec)->this_hdr.contents != contents)
1167 if (internal_relocs != NULL
1168 && elf_section_data (sec)->relocs != internal_relocs)
1169 free (internal_relocs);
1175 #define ELF_ARCH bfd_arch_msp430
1176 #define ELF_MACHINE_CODE EM_MSP430
1177 #define ELF_MACHINE_ALT1 EM_MSP430_OLD
1178 #define ELF_MAXPAGESIZE 1
1179 #define ELF_OSABI ELFOSABI_STANDALONE
1181 #define TARGET_LITTLE_SYM bfd_elf32_msp430_vec
1182 #define TARGET_LITTLE_NAME "elf32-msp430"
1184 #define elf_info_to_howto msp430_info_to_howto_rela
1185 #define elf_info_to_howto_rel NULL
1186 #define elf_backend_relocate_section elf32_msp430_relocate_section
1187 #define elf_backend_check_relocs elf32_msp430_check_relocs
1188 #define elf_backend_can_gc_sections 1
1189 #define elf_backend_final_write_processing bfd_elf_msp430_final_write_processing
1190 #define elf_backend_object_p elf32_msp430_object_p
1191 #define elf_backend_post_process_headers _bfd_elf_set_osabi
1192 #define bfd_elf32_bfd_relax_section msp430_elf_relax_section
1194 #include "elf32-target.h"