1 /* MSP430-specific support for 32-bit ELF
2 Copyright (C) 2002, 2003, 2004 Free Software Foundation, Inc.
3 Contributed by Dmitry Diky <diwil@mail.ru>
5 This file is part of BFD, the Binary File Descriptor library.
7 This program is free software; you can redistribute it and/or modify
8 it under the terms of the GNU General Public License as published by
9 the Free Software Foundation; either version 2 of the License, or
10 (at your option) any later version.
12 This program is distributed in the hope that it will be useful,
13 but WITHOUT ANY WARRANTY; without even the implied warranty of
14 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
15 GNU General Public License for more details.
17 You should have received a copy of the GNU General Public License
18 along with this program; if not, write to the Free Software
19 Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */
23 #include "libiberty.h"
26 #include "elf/msp430.h"
28 /* Use RELA instead of REL. */
31 static reloc_howto_type elf_msp430_howto_table[] =
33 HOWTO (R_MSP430_NONE, /* type */
35 2, /* size (0 = byte, 1 = short, 2 = long) */
37 FALSE, /* pc_relative */
39 complain_overflow_bitfield,/* complain_on_overflow */
40 bfd_elf_generic_reloc, /* special_function */
41 "R_MSP430_NONE", /* name */
42 FALSE, /* partial_inplace */
45 FALSE), /* pcrel_offset */
47 HOWTO (R_MSP430_32, /* type */
49 2, /* size (0 = byte, 1 = short, 2 = long) */
51 FALSE, /* pc_relative */
53 complain_overflow_bitfield,/* complain_on_overflow */
54 bfd_elf_generic_reloc, /* special_function */
55 "R_MSP430_32", /* name */
56 FALSE, /* partial_inplace */
57 0xffffffff, /* src_mask */
58 0xffffffff, /* dst_mask */
59 FALSE), /* pcrel_offset */
61 /* A 13 bit PC relative relocation. */
62 HOWTO (R_MSP430_10_PCREL, /* type */
64 1, /* size (0 = byte, 1 = short, 2 = long) */
66 TRUE, /* pc_relative */
68 complain_overflow_bitfield,/* complain_on_overflow */
69 bfd_elf_generic_reloc, /* special_function */
70 "R_MSP430_13_PCREL", /* name */
71 FALSE, /* partial_inplace */
74 TRUE), /* pcrel_offset */
76 /* A 16 bit absolute relocation. */
77 HOWTO (R_MSP430_16, /* type */
79 1, /* size (0 = byte, 1 = short, 2 = long) */
81 FALSE, /* pc_relative */
83 complain_overflow_dont,/* complain_on_overflow */
84 bfd_elf_generic_reloc, /* special_function */
85 "R_MSP430_16", /* name */
86 FALSE, /* partial_inplace */
88 0xffff, /* dst_mask */
89 FALSE), /* pcrel_offset */
91 /* A 16 bit absolute relocation for command address. */
92 HOWTO (R_MSP430_16_PCREL, /* type */
94 1, /* size (0 = byte, 1 = short, 2 = long) */
96 TRUE, /* pc_relative */
98 complain_overflow_dont,/* complain_on_overflow */
99 bfd_elf_generic_reloc, /* special_function */
100 "R_MSP430_16_PCREL", /* name */
101 FALSE, /* partial_inplace */
103 0xffff, /* dst_mask */
104 TRUE), /* pcrel_offset */
106 /* A 16 bit absolute relocation, byte operations. */
107 HOWTO (R_MSP430_16_BYTE, /* type */
109 1, /* size (0 = byte, 1 = short, 2 = long) */
111 FALSE, /* pc_relative */
113 complain_overflow_dont,/* complain_on_overflow */
114 bfd_elf_generic_reloc, /* special_function */
115 "R_MSP430_16_BYTE", /* name */
116 FALSE, /* partial_inplace */
117 0xffff, /* src_mask */
118 0xffff, /* dst_mask */
119 FALSE), /* pcrel_offset */
121 /* A 16 bit absolute relocation for command address. */
122 HOWTO (R_MSP430_16_PCREL_BYTE,/* type */
124 1, /* size (0 = byte, 1 = short, 2 = long) */
126 TRUE, /* pc_relative */
128 complain_overflow_dont,/* complain_on_overflow */
129 bfd_elf_generic_reloc, /* special_function */
130 "R_MSP430_16_PCREL_BYTE",/* name */
131 FALSE, /* partial_inplace */
132 0xffff, /* src_mask */
133 0xffff, /* dst_mask */
134 TRUE), /* pcrel_offset */
136 /* A 13 bit PC relative relocation for complicated polymorphs. */
137 HOWTO (R_MSP430_2X_PCREL, /* type */
139 2, /* size (0 = byte, 1 = short, 2 = long) */
141 TRUE, /* pc_relative */
143 complain_overflow_bitfield,/* complain_on_overflow */
144 bfd_elf_generic_reloc, /* special_function */
145 "R_MSP430_2X_PCREL", /* name */
146 FALSE, /* partial_inplace */
147 0xfff, /* src_mask */
148 0xfff, /* dst_mask */
149 TRUE), /* pcrel_offset */
151 /* A 16 bit relaxable relocation for command address. */
152 HOWTO (R_MSP430_RL_PCREL, /* type */
154 1, /* size (0 = byte, 1 = short, 2 = long) */
156 TRUE, /* pc_relative */
158 complain_overflow_dont,/* complain_on_overflow */
159 bfd_elf_generic_reloc, /* special_function */
160 "R_MSP430_RL_PCREL", /* name */
161 FALSE, /* partial_inplace */
163 0xffff, /* dst_mask */
164 TRUE) /* pcrel_offset */
167 /* Map BFD reloc types to MSP430 ELF reloc types. */
169 struct msp430_reloc_map
171 bfd_reloc_code_real_type bfd_reloc_val;
172 unsigned int elf_reloc_val;
175 static const struct msp430_reloc_map msp430_reloc_map[] =
177 {BFD_RELOC_NONE, R_MSP430_NONE},
178 {BFD_RELOC_32, R_MSP430_32},
179 {BFD_RELOC_MSP430_10_PCREL, R_MSP430_10_PCREL},
180 {BFD_RELOC_16, R_MSP430_16_BYTE},
181 {BFD_RELOC_MSP430_16_PCREL, R_MSP430_16_PCREL},
182 {BFD_RELOC_MSP430_16, R_MSP430_16},
183 {BFD_RELOC_MSP430_16_PCREL_BYTE, R_MSP430_16_PCREL_BYTE},
184 {BFD_RELOC_MSP430_16_BYTE, R_MSP430_16_BYTE},
185 {BFD_RELOC_MSP430_2X_PCREL, R_MSP430_2X_PCREL},
186 {BFD_RELOC_MSP430_RL_PCREL, R_MSP430_RL_PCREL}
189 static reloc_howto_type *
190 bfd_elf32_bfd_reloc_type_lookup (bfd * abfd ATTRIBUTE_UNUSED,
191 bfd_reloc_code_real_type code)
195 for (i = 0; i < ARRAY_SIZE (msp430_reloc_map); i++)
196 if (msp430_reloc_map[i].bfd_reloc_val == code)
197 return &elf_msp430_howto_table[msp430_reloc_map[i].elf_reloc_val];
202 /* Set the howto pointer for an MSP430 ELF reloc. */
205 msp430_info_to_howto_rela (bfd * abfd ATTRIBUTE_UNUSED,
207 Elf_Internal_Rela * dst)
211 r_type = ELF32_R_TYPE (dst->r_info);
212 BFD_ASSERT (r_type < (unsigned int) R_MSP430_max);
213 cache_ptr->howto = &elf_msp430_howto_table[r_type];
217 elf32_msp430_gc_mark_hook (asection * sec,
218 struct bfd_link_info * info ATTRIBUTE_UNUSED,
219 Elf_Internal_Rela * rel,
220 struct elf_link_hash_entry * h,
221 Elf_Internal_Sym * sym)
225 switch (ELF32_R_TYPE (rel->r_info))
228 switch (h->root.type)
230 case bfd_link_hash_defined:
231 case bfd_link_hash_defweak:
232 return h->root.u.def.section;
234 case bfd_link_hash_common:
235 return h->root.u.c.p->section;
243 return bfd_section_from_elf_index (sec->owner, sym->st_shndx);
249 elf32_msp430_gc_sweep_hook (bfd * abfd ATTRIBUTE_UNUSED,
250 struct bfd_link_info * info ATTRIBUTE_UNUSED,
251 asection * sec ATTRIBUTE_UNUSED,
252 const Elf_Internal_Rela * relocs ATTRIBUTE_UNUSED)
254 /* We don't use got and plt entries for msp430. */
258 /* Look through the relocs for a section during the first phase.
259 Since we don't do .gots or .plts, we just need to consider the
260 virtual table relocs for gc. */
263 elf32_msp430_check_relocs (bfd * abfd, struct bfd_link_info * info,
264 asection * sec, const Elf_Internal_Rela * relocs)
266 Elf_Internal_Shdr *symtab_hdr;
267 struct elf_link_hash_entry **sym_hashes, **sym_hashes_end;
268 const Elf_Internal_Rela *rel;
269 const Elf_Internal_Rela *rel_end;
271 if (info->relocatable)
274 symtab_hdr = &elf_tdata (abfd)->symtab_hdr;
275 sym_hashes = elf_sym_hashes (abfd);
277 sym_hashes + symtab_hdr->sh_size / sizeof (Elf32_External_Sym);
278 if (!elf_bad_symtab (abfd))
279 sym_hashes_end -= symtab_hdr->sh_info;
281 rel_end = relocs + sec->reloc_count;
282 for (rel = relocs; rel < rel_end; rel++)
284 struct elf_link_hash_entry *h;
285 unsigned long r_symndx;
287 r_symndx = ELF32_R_SYM (rel->r_info);
288 if (r_symndx < symtab_hdr->sh_info)
291 h = sym_hashes[r_symndx - symtab_hdr->sh_info];
297 /* Perform a single relocation. By default we use the standard BFD
298 routines, but a few relocs, we have to do them ourselves. */
300 static bfd_reloc_status_type
301 msp430_final_link_relocate (reloc_howto_type * howto, bfd * input_bfd,
302 asection * input_section, bfd_byte * contents,
303 Elf_Internal_Rela * rel, bfd_vma relocation)
305 bfd_reloc_status_type r = bfd_reloc_ok;
311 case R_MSP430_10_PCREL:
312 contents += rel->r_offset;
313 srel = (bfd_signed_vma) relocation;
314 srel += rel->r_addend;
315 srel -= rel->r_offset;
316 srel -= 2; /* Branch instructions add 2 to the PC... */
317 srel -= (input_section->output_section->vma +
318 input_section->output_offset);
321 return bfd_reloc_outofrange;
323 /* MSP430 addresses commands as words. */
326 /* Check for an overflow. */
327 if (srel < -512 || srel > 511)
328 return bfd_reloc_overflow;
330 x = bfd_get_16 (input_bfd, contents);
331 x = (x & 0xfc00) | (srel & 0x3ff);
332 bfd_put_16 (input_bfd, x, contents);
335 case R_MSP430_2X_PCREL:
336 contents += rel->r_offset;
337 srel = (bfd_signed_vma) relocation;
338 srel += rel->r_addend;
339 srel -= rel->r_offset;
340 srel -= 2; /* Branch instructions add 2 to the PC... */
341 srel -= (input_section->output_section->vma +
342 input_section->output_offset);
345 return bfd_reloc_outofrange;
347 /* MSP430 addresses commands as words. */
350 /* Check for an overflow. */
351 if (srel < -512 || srel > 511)
352 return bfd_reloc_overflow;
354 x = bfd_get_16 (input_bfd, contents);
355 x = (x & 0xfc00) | (srel & 0x3ff);
356 bfd_put_16 (input_bfd, x, contents);
357 /* Handle second jump instruction. */
358 x = bfd_get_16 (input_bfd, contents - 2);
360 x = (x & 0xfc00) | (srel & 0x3ff);
361 bfd_put_16 (input_bfd, x, contents - 2);
364 case R_MSP430_16_PCREL:
365 case R_MSP430_RL_PCREL:
366 contents += rel->r_offset;
367 srel = (bfd_signed_vma) relocation;
368 srel += rel->r_addend;
369 srel -= rel->r_offset;
370 /* Only branch instructions add 2 to the PC... */
371 srel -= (input_section->output_section->vma +
372 input_section->output_offset);
375 return bfd_reloc_outofrange;
377 bfd_put_16 (input_bfd, srel & 0xffff, contents);
380 case R_MSP430_16_PCREL_BYTE:
381 contents += rel->r_offset;
382 srel = (bfd_signed_vma) relocation;
383 srel += rel->r_addend;
384 srel -= rel->r_offset;
385 /* Only branch instructions add 2 to the PC... */
386 srel -= (input_section->output_section->vma +
387 input_section->output_offset);
389 bfd_put_16 (input_bfd, srel & 0xffff, contents);
392 case R_MSP430_16_BYTE:
393 contents += rel->r_offset;
394 srel = (bfd_signed_vma) relocation;
395 srel += rel->r_addend;
396 bfd_put_16 (input_bfd, srel & 0xffff, contents);
400 contents += rel->r_offset;
401 srel = (bfd_signed_vma) relocation;
402 srel += rel->r_addend;
405 return bfd_reloc_notsupported;
407 bfd_put_16 (input_bfd, srel & 0xffff, contents);
411 r = _bfd_final_link_relocate (howto, input_bfd, input_section,
412 contents, rel->r_offset,
413 relocation, rel->r_addend);
419 /* Relocate an MSP430 ELF section. */
422 elf32_msp430_relocate_section (bfd * output_bfd ATTRIBUTE_UNUSED,
423 struct bfd_link_info * info,
425 asection * input_section,
427 Elf_Internal_Rela * relocs,
428 Elf_Internal_Sym * local_syms,
429 asection ** local_sections)
431 Elf_Internal_Shdr *symtab_hdr;
432 struct elf_link_hash_entry **sym_hashes;
433 Elf_Internal_Rela *rel;
434 Elf_Internal_Rela *relend;
436 symtab_hdr = &elf_tdata (input_bfd)->symtab_hdr;
437 sym_hashes = elf_sym_hashes (input_bfd);
438 relend = relocs + input_section->reloc_count;
440 for (rel = relocs; rel < relend; rel++)
442 reloc_howto_type *howto;
443 unsigned long r_symndx;
444 Elf_Internal_Sym *sym;
446 struct elf_link_hash_entry *h;
448 bfd_reloc_status_type r;
449 const char *name = NULL;
452 /* This is a final link. */
454 r_type = ELF32_R_TYPE (rel->r_info);
455 r_symndx = ELF32_R_SYM (rel->r_info);
456 howto = elf_msp430_howto_table + ELF32_R_TYPE (rel->r_info);
461 if (r_symndx < symtab_hdr->sh_info)
463 sym = local_syms + r_symndx;
464 sec = local_sections[r_symndx];
465 relocation = _bfd_elf_rela_local_sym (output_bfd, sym, &sec, rel);
467 name = bfd_elf_string_from_elf_section
468 (input_bfd, symtab_hdr->sh_link, sym->st_name);
469 name = (name == NULL) ? bfd_section_name (input_bfd, sec) : name;
473 bfd_boolean unresolved_reloc, warned;
475 RELOC_FOR_GLOBAL_SYMBOL (info, input_bfd, input_section, rel,
476 r_symndx, symtab_hdr, sym_hashes,
478 unresolved_reloc, warned);
481 r = msp430_final_link_relocate (howto, input_bfd, input_section,
482 contents, rel, relocation);
484 if (r != bfd_reloc_ok)
486 const char *msg = (const char *) NULL;
490 case bfd_reloc_overflow:
491 r = info->callbacks->reloc_overflow
492 (info, (h ? &h->root : NULL), name, howto->name,
493 (bfd_vma) 0, input_bfd, input_section,
497 case bfd_reloc_undefined:
498 r = info->callbacks->undefined_symbol
499 (info, name, input_bfd, input_section, rel->r_offset, TRUE);
502 case bfd_reloc_outofrange:
503 msg = _("internal error: out of range error");
506 case bfd_reloc_notsupported:
507 msg = _("internal error: unsupported relocation error");
510 case bfd_reloc_dangerous:
511 msg = _("internal error: dangerous relocation");
515 msg = _("internal error: unknown error");
520 r = info->callbacks->warning
521 (info, msg, name, input_bfd, input_section, rel->r_offset);
532 /* The final processing done just before writing out a MSP430 ELF object
533 file. This gets the MSP430 architecture right based on the machine
537 bfd_elf_msp430_final_write_processing (bfd * abfd,
538 bfd_boolean linker ATTRIBUTE_UNUSED)
542 switch (bfd_get_mach (abfd))
545 case bfd_mach_msp110:
546 val = E_MSP430_MACH_MSP430x11x1;
550 val = E_MSP430_MACH_MSP430x11;
554 val = E_MSP430_MACH_MSP430x12;
558 val = E_MSP430_MACH_MSP430x13;
562 val = E_MSP430_MACH_MSP430x14;
566 val = E_MSP430_MACH_MSP430x15;
570 val = E_MSP430_MACH_MSP430x16;
574 val = E_MSP430_MACH_MSP430x31;
578 val = E_MSP430_MACH_MSP430x32;
582 val = E_MSP430_MACH_MSP430x33;
586 val = E_MSP430_MACH_MSP430x41;
590 val = E_MSP430_MACH_MSP430x42;
594 val = E_MSP430_MACH_MSP430x43;
598 val = E_MSP430_MACH_MSP430x44;
602 elf_elfheader (abfd)->e_machine = EM_MSP430;
603 elf_elfheader (abfd)->e_flags &= ~EF_MSP430_MACH;
604 elf_elfheader (abfd)->e_flags |= val;
607 /* Set the right machine number. */
610 elf32_msp430_object_p (bfd * abfd)
612 int e_set = bfd_mach_msp14;
614 if (elf_elfheader (abfd)->e_machine == EM_MSP430
615 || elf_elfheader (abfd)->e_machine == EM_MSP430_OLD)
617 int e_mach = elf_elfheader (abfd)->e_flags & EF_MSP430_MACH;
622 case E_MSP430_MACH_MSP430x11:
623 e_set = bfd_mach_msp11;
626 case E_MSP430_MACH_MSP430x11x1:
627 e_set = bfd_mach_msp110;
630 case E_MSP430_MACH_MSP430x12:
631 e_set = bfd_mach_msp12;
634 case E_MSP430_MACH_MSP430x13:
635 e_set = bfd_mach_msp13;
638 case E_MSP430_MACH_MSP430x14:
639 e_set = bfd_mach_msp14;
642 case E_MSP430_MACH_MSP430x15:
643 e_set = bfd_mach_msp15;
646 case E_MSP430_MACH_MSP430x16:
647 e_set = bfd_mach_msp16;
650 case E_MSP430_MACH_MSP430x31:
651 e_set = bfd_mach_msp31;
654 case E_MSP430_MACH_MSP430x32:
655 e_set = bfd_mach_msp32;
658 case E_MSP430_MACH_MSP430x33:
659 e_set = bfd_mach_msp33;
662 case E_MSP430_MACH_MSP430x41:
663 e_set = bfd_mach_msp41;
666 case E_MSP430_MACH_MSP430x42:
667 e_set = bfd_mach_msp42;
670 case E_MSP430_MACH_MSP430x43:
671 e_set = bfd_mach_msp43;
674 case E_MSP430_MACH_MSP430x44:
675 e_set = bfd_mach_msp44;
680 return bfd_default_set_arch_mach (abfd, bfd_arch_msp430, e_set);
684 elf32_msp430_post_process_headers (bfd * abfd,
685 struct bfd_link_info * link_info ATTRIBUTE_UNUSED)
687 Elf_Internal_Ehdr * i_ehdrp; /* ELF file header, internal form. */
689 i_ehdrp = elf_elfheader (abfd);
691 #ifndef ELFOSABI_STANDALONE
692 #define ELFOSABI_STANDALONE 255
695 i_ehdrp->e_ident[EI_OSABI] = ELFOSABI_STANDALONE;
698 /* These functions handle relaxing for the msp430.
699 Relaxation required only in two cases:
700 - Bad hand coding like jumps from one section to another or
702 - Sibling calls. This will affect onlu 'jump label' polymorph. Without
703 relaxing this enlarges code by 2 bytes. Sibcalls implemented but
704 do not work in gcc's port by the reason I do not know.
705 Anyway, if a relaxation required, user should pass -relax option to the
708 There are quite a few relaxing opportunities available on the msp430:
710 ================================================================
714 eq == jeq label jne +4; br lab
715 ne != jne label jeq +4; br lab
716 lt < jl label jge +4; br lab
717 ltu < jlo label lhs +4; br lab
718 ge >= jge label jl +4; br lab
719 geu >= jhs label jlo +4; br lab
723 ltn < jn jn +2; jmp +4; br lab
725 3. 4 words -> 2 words
727 gt > jeq +2; jge label jeq +6; jl +4; br label
728 gtu > jeq +2; jhs label jeq +6; jlo +4; br label
730 4. 4 words -> 2 words and 2 labels
732 leu <= jeq label; jlo label jeq +2; jhs +4; br label
733 le <= jeq label; jl label jeq +2; jge +4; br label
734 =================================================================
736 codemap for first cases is (labels masked ):
737 eq: 0x2002,0x4010,0x0000 -> 0x2400
738 ne: 0x2402,0x4010,0x0000 -> 0x2000
739 lt: 0x3402,0x4010,0x0000 -> 0x3800
740 ltu: 0x2c02,0x4010,0x0000 -> 0x2800
741 ge: 0x3802,0x4010,0x0000 -> 0x3400
742 geu: 0x2802,0x4010,0x0000 -> 0x2c00
745 ltn: 0x3001,0x3c02,0x4010,0x0000 -> 0x3000
748 gt: 0x2403,0x3802,0x4010,0x0000 -> 0x2401,0x3400
749 gtu: 0x2403,0x2802,0x4010,0x0000 -> 0x2401,0x2c00
752 leu: 0x2401,0x2c02,0x4010,0x0000 -> 0x2400,0x2800
753 le: 0x2401,0x3402,0x4010,0x0000 -> 0x2400,0x3800
756 jump: 0x4010,0x0000 -> 0x3c00. */
758 #define NUMB_RELAX_CODES 12
759 static struct rcodes_s
761 int f0, f1; /* From code. */
762 int t0, t1; /* To code. */
763 int labels; /* Position of labels: 1 - one label at first
764 word, 2 - one at second word, 3 - two
766 int cdx; /* Words to match. */
767 int bs; /* Shrink bytes. */
768 int off; /* Offset from old label for new code. */
769 int ncl; /* New code length. */
771 {/* lab,cdx,bs,off,ncl */
772 { 0x0000, 0x0000, 0x3c00, 0x0000, 1, 0, 2, 2, 2}, /* jump */
773 { 0x0000, 0x2002, 0x2400, 0x0000, 1, 1, 4, 4, 2}, /* eq */
774 { 0x0000, 0x2402, 0x2000, 0x0000, 1, 1, 4, 4, 2}, /* ne */
775 { 0x0000, 0x3402, 0x3800, 0x0000, 1, 1, 4, 4, 2}, /* lt */
776 { 0x0000, 0x2c02, 0x2800, 0x0000, 1, 1, 4, 4, 2}, /* ltu */
777 { 0x0000, 0x3802, 0x3400, 0x0000, 1, 1, 4, 4, 2}, /* ge */
778 { 0x0000, 0x2802, 0x2c00, 0x0000, 1, 1, 4, 4, 2}, /* geu */
779 { 0x3001, 0x3c02, 0x3000, 0x0000, 1, 2, 6, 6, 2}, /* ltn */
780 { 0x2403, 0x3802, 0x2401, 0x3400, 2, 2, 4, 6, 4}, /* gt */
781 { 0x2403, 0x2802, 0x2401, 0x2c00, 2, 2, 4, 6, 4}, /* gtu */
782 { 0x2401, 0x2c02, 0x2400, 0x2800, 3, 2, 4, 6, 4}, /* leu , 2 labels */
783 { 0x2401, 0x2c02, 0x2400, 0x2800, 3, 2, 4, 6, 4}, /* le , 2 labels */
784 { 0, 0, 0, 0, 0, 0, 0, 0, 0}
787 /* Return TRUE if a symbol exists at the given address. */
790 msp430_elf_symbol_address_p (bfd * abfd,
792 Elf_Internal_Sym * isym,
795 Elf_Internal_Shdr *symtab_hdr;
796 unsigned int sec_shndx;
797 Elf_Internal_Sym *isymend;
798 struct elf_link_hash_entry **sym_hashes;
799 struct elf_link_hash_entry **end_hashes;
800 unsigned int symcount;
802 sec_shndx = _bfd_elf_section_from_bfd_section (abfd, sec);
804 /* Examine all the local symbols. */
805 symtab_hdr = &elf_tdata (abfd)->symtab_hdr;
806 for (isymend = isym + symtab_hdr->sh_info; isym < isymend; isym++)
807 if (isym->st_shndx == sec_shndx && isym->st_value == addr)
810 symcount = (symtab_hdr->sh_size / sizeof (Elf32_External_Sym)
811 - symtab_hdr->sh_info);
812 sym_hashes = elf_sym_hashes (abfd);
813 end_hashes = sym_hashes + symcount;
814 for (; sym_hashes < end_hashes; sym_hashes++)
816 struct elf_link_hash_entry *sym_hash = *sym_hashes;
818 if ((sym_hash->root.type == bfd_link_hash_defined
819 || sym_hash->root.type == bfd_link_hash_defweak)
820 && sym_hash->root.u.def.section == sec
821 && sym_hash->root.u.def.value == addr)
828 /* Delete some bytes from a section while relaxing. */
831 msp430_elf_relax_delete_bytes (bfd * abfd, asection * sec, bfd_vma addr,
834 Elf_Internal_Shdr *symtab_hdr;
835 unsigned int sec_shndx;
837 Elf_Internal_Rela *irel;
838 Elf_Internal_Rela *irelend;
839 Elf_Internal_Rela *irelalign;
841 Elf_Internal_Sym *isym;
842 Elf_Internal_Sym *isymend;
843 struct elf_link_hash_entry **sym_hashes;
844 struct elf_link_hash_entry **end_hashes;
845 unsigned int symcount;
847 sec_shndx = _bfd_elf_section_from_bfd_section (abfd, sec);
849 contents = elf_section_data (sec)->this_hdr.contents;
851 /* The deletion must stop at the next ALIGN reloc for an aligment
852 power larger than the number of bytes we are deleting. */
857 irel = elf_section_data (sec)->relocs;
858 irelend = irel + sec->reloc_count;
860 /* Actually delete the bytes. */
861 memmove (contents + addr, contents + addr + count,
862 (size_t) (toaddr - addr - count));
865 /* Adjust all the relocs. */
866 for (irel = elf_section_data (sec)->relocs; irel < irelend; irel++)
867 /* Get the new reloc address. */
868 if ((irel->r_offset > addr && irel->r_offset < toaddr))
869 irel->r_offset -= count;
871 /* Adjust the local symbols defined in this section. */
872 symtab_hdr = & elf_tdata (abfd)->symtab_hdr;
873 isym = (Elf_Internal_Sym *) symtab_hdr->contents;
874 for (isymend = isym + symtab_hdr->sh_info; isym < isymend; isym++)
875 if (isym->st_shndx == sec_shndx
876 && isym->st_value > addr && isym->st_value < toaddr)
877 isym->st_value -= count;
879 /* Now adjust the global symbols defined in this section. */
880 symcount = (symtab_hdr->sh_size / sizeof (Elf32_External_Sym)
881 - symtab_hdr->sh_info);
882 sym_hashes = elf_sym_hashes (abfd);
883 end_hashes = sym_hashes + symcount;
884 for (; sym_hashes < end_hashes; sym_hashes++)
886 struct elf_link_hash_entry *sym_hash = *sym_hashes;
888 if ((sym_hash->root.type == bfd_link_hash_defined
889 || sym_hash->root.type == bfd_link_hash_defweak)
890 && sym_hash->root.u.def.section == sec
891 && sym_hash->root.u.def.value > addr
892 && sym_hash->root.u.def.value < toaddr)
893 sym_hash->root.u.def.value -= count;
901 msp430_elf_relax_section (bfd * abfd, asection * sec,
902 struct bfd_link_info * link_info,
905 Elf_Internal_Shdr * symtab_hdr;
906 Elf_Internal_Rela * internal_relocs;
907 Elf_Internal_Rela * irel;
908 Elf_Internal_Rela * irelend;
909 bfd_byte * contents = NULL;
910 Elf_Internal_Sym * isymbuf = NULL;
912 /* Assume nothing changes. */
915 /* We don't have to do anything for a relocatable link, if
916 this section does not have relocs, or if this is not a
918 if (link_info->relocatable
919 || (sec->flags & SEC_RELOC) == 0
920 || sec->reloc_count == 0 || (sec->flags & SEC_CODE) == 0)
923 symtab_hdr = & elf_tdata (abfd)->symtab_hdr;
925 /* Get a copy of the native relocations. */
927 _bfd_elf_link_read_relocs (abfd, sec, NULL, NULL, link_info->keep_memory);
928 if (internal_relocs == NULL)
931 /* Walk through them looking for relaxing opportunities. */
932 irelend = internal_relocs + sec->reloc_count;
933 for (irel = internal_relocs; irel < irelend; irel++)
937 /* If this isn't something that can be relaxed, then ignore
939 if (ELF32_R_TYPE (irel->r_info) != (int) R_MSP430_RL_PCREL)
942 /* Get the section contents if we haven't done so already. */
943 if (contents == NULL)
945 /* Get cached copy if it exists. */
946 if (elf_section_data (sec)->this_hdr.contents != NULL)
947 contents = elf_section_data (sec)->this_hdr.contents;
948 else if (! bfd_malloc_and_get_section (abfd, sec, &contents))
952 /* Read this BFD's local symbols if we haven't done so already. */
953 if (isymbuf == NULL && symtab_hdr->sh_info != 0)
955 isymbuf = (Elf_Internal_Sym *) symtab_hdr->contents;
957 isymbuf = bfd_elf_get_elf_syms (abfd, symtab_hdr,
958 symtab_hdr->sh_info, 0,
964 /* Get the value of the symbol referred to by the reloc. */
965 if (ELF32_R_SYM (irel->r_info) < symtab_hdr->sh_info)
967 /* A local symbol. */
968 Elf_Internal_Sym *isym;
971 isym = isymbuf + ELF32_R_SYM (irel->r_info);
972 if (isym->st_shndx == SHN_UNDEF)
973 sym_sec = bfd_und_section_ptr;
974 else if (isym->st_shndx == SHN_ABS)
975 sym_sec = bfd_abs_section_ptr;
976 else if (isym->st_shndx == SHN_COMMON)
977 sym_sec = bfd_com_section_ptr;
979 sym_sec = bfd_section_from_elf_index (abfd, isym->st_shndx);
980 symval = (isym->st_value
981 + sym_sec->output_section->vma + sym_sec->output_offset);
986 struct elf_link_hash_entry *h;
988 /* An external symbol. */
989 indx = ELF32_R_SYM (irel->r_info) - symtab_hdr->sh_info;
990 h = elf_sym_hashes (abfd)[indx];
991 BFD_ASSERT (h != NULL);
993 if (h->root.type != bfd_link_hash_defined
994 && h->root.type != bfd_link_hash_defweak)
995 /* This appears to be a reference to an undefined
996 symbol. Just ignore it--it will be caught by the
997 regular reloc processing. */
1000 symval = (h->root.u.def.value
1001 + h->root.u.def.section->output_section->vma
1002 + h->root.u.def.section->output_offset);
1005 /* For simplicity of coding, we are going to modify the section
1006 contents, the section relocs, and the BFD symbol table. We
1007 must tell the rest of the code not to free up this
1008 information. It would be possible to instead create a table
1009 of changes which have to be made, as is done in coff-mips.c;
1010 that would be more work, but would require less memory when
1011 the linker is run. */
1013 /* Try to turn a 16bit pc-relative branch into a 10bit pc-relative
1015 /* Paranoia? paranoia... */
1016 if (ELF32_R_TYPE (irel->r_info) == (int) R_MSP430_RL_PCREL)
1018 bfd_vma value = symval;
1020 /* Deal with pc-relative gunk. */
1021 value -= (sec->output_section->vma + sec->output_offset);
1022 value -= irel->r_offset;
1023 value += irel->r_addend;
1025 /* See if the value will fit in 10 bits, note the high value is
1026 1016 as the target will be two bytes closer if we are
1028 if ((long) value < 1016 && (long) value > -1016)
1030 int code0 = 0, code1 = 0, code2 = 0;
1032 struct rcodes_s *rx;
1034 /* Get the opcode. */
1035 if (irel->r_offset >= 6)
1036 code0 = bfd_get_16 (abfd, contents + irel->r_offset - 6);
1038 if (irel->r_offset >= 4)
1039 code1 = bfd_get_16 (abfd, contents + irel->r_offset - 4);
1041 code2 = bfd_get_16 (abfd, contents + irel->r_offset - 2);
1043 if (code2 != 0x4010)
1046 /* Check r4 and r3. */
1047 for (i = NUMB_RELAX_CODES - 1; i >= 0; i--)
1050 if (rx->cdx == 2 && rx->f0 == code0 && rx->f1 == code1)
1052 else if (rx->cdx == 1 && rx->f1 == code1)
1054 else if (rx->cdx == 0) /* This is an unconditional jump. */
1059 .Label0: ; we do not care about this label
1061 .Label1: ; make sure there is no label here
1063 .Label2: ; make sure there is no label here
1066 So, if there is .Label1 or .Label2 we cannot relax this code.
1067 This actually should not happen, cause for relaxable
1068 instructions we use RL_PCREL reloc instead of 16_PCREL.
1069 Will change this in the future. */
1072 && msp430_elf_symbol_address_p (abfd, sec, isymbuf,
1073 irel->r_offset - 2))
1076 && msp430_elf_symbol_address_p (abfd, sec, isymbuf,
1077 irel->r_offset - 4))
1080 /* Note that we've changed the relocs, section contents, etc. */
1081 elf_section_data (sec)->relocs = internal_relocs;
1082 elf_section_data (sec)->this_hdr.contents = contents;
1083 symtab_hdr->contents = (unsigned char *) isymbuf;
1085 /* Fix the relocation's type. */
1086 if (rx->labels == 3) /* Handle special cases. */
1087 irel->r_info = ELF32_R_INFO (ELF32_R_SYM (irel->r_info),
1090 irel->r_info = ELF32_R_INFO (ELF32_R_SYM (irel->r_info),
1093 /* Fix the opcode right way. */
1094 bfd_put_16 (abfd, rx->t0, contents + irel->r_offset - rx->off);
1096 bfd_put_16 (abfd, rx->t1,
1097 contents + irel->r_offset - rx->off + 2);
1100 if (!msp430_elf_relax_delete_bytes (abfd, sec,
1101 irel->r_offset - rx->off +
1105 /* Handle unconditional jumps. */
1107 irel->r_offset -= 2;
1109 /* That will change things, so, we should relax again.
1110 Note that this is not required, and it may be slow. */
1116 if (isymbuf != NULL && symtab_hdr->contents != (unsigned char *) isymbuf)
1118 if (!link_info->keep_memory)
1122 /* Cache the symbols for elf_link_input_bfd. */
1123 symtab_hdr->contents = (unsigned char *) isymbuf;
1127 if (contents != NULL
1128 && elf_section_data (sec)->this_hdr.contents != contents)
1130 if (!link_info->keep_memory)
1134 /* Cache the section contents for elf_link_input_bfd. */
1135 elf_section_data (sec)->this_hdr.contents = contents;
1139 if (internal_relocs != NULL
1140 && elf_section_data (sec)->relocs != internal_relocs)
1141 free (internal_relocs);
1146 if (isymbuf != NULL && symtab_hdr->contents != (unsigned char *) isymbuf)
1148 if (contents != NULL
1149 && elf_section_data (sec)->this_hdr.contents != contents)
1151 if (internal_relocs != NULL
1152 && elf_section_data (sec)->relocs != internal_relocs)
1153 free (internal_relocs);
1159 #define ELF_ARCH bfd_arch_msp430
1160 #define ELF_MACHINE_CODE EM_MSP430
1161 #define ELF_MACHINE_ALT1 EM_MSP430_OLD
1162 #define ELF_MAXPAGESIZE 1
1164 #define TARGET_LITTLE_SYM bfd_elf32_msp430_vec
1165 #define TARGET_LITTLE_NAME "elf32-msp430"
1167 #define elf_info_to_howto msp430_info_to_howto_rela
1168 #define elf_info_to_howto_rel NULL
1169 #define elf_backend_relocate_section elf32_msp430_relocate_section
1170 #define elf_backend_gc_mark_hook elf32_msp430_gc_mark_hook
1171 #define elf_backend_gc_sweep_hook elf32_msp430_gc_sweep_hook
1172 #define elf_backend_check_relocs elf32_msp430_check_relocs
1173 #define elf_backend_can_gc_sections 1
1174 #define elf_backend_final_write_processing bfd_elf_msp430_final_write_processing
1175 #define elf_backend_object_p elf32_msp430_object_p
1176 #define elf_backend_post_process_headers elf32_msp430_post_process_headers
1177 #define bfd_elf32_bfd_relax_section msp430_elf_relax_section
1179 #include "elf32-target.h"