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, name, howto->name, (bfd_vma) 0,
493 input_bfd, input_section, rel->r_offset);
496 case bfd_reloc_undefined:
497 r = info->callbacks->undefined_symbol
498 (info, name, input_bfd, input_section, rel->r_offset, TRUE);
501 case bfd_reloc_outofrange:
502 msg = _("internal error: out of range error");
505 case bfd_reloc_notsupported:
506 msg = _("internal error: unsupported relocation error");
509 case bfd_reloc_dangerous:
510 msg = _("internal error: dangerous relocation");
514 msg = _("internal error: unknown error");
519 r = info->callbacks->warning
520 (info, msg, name, input_bfd, input_section, rel->r_offset);
531 /* The final processing done just before writing out a MSP430 ELF object
532 file. This gets the MSP430 architecture right based on the machine
536 bfd_elf_msp430_final_write_processing (bfd * abfd,
537 bfd_boolean linker ATTRIBUTE_UNUSED)
541 switch (bfd_get_mach (abfd))
544 case bfd_mach_msp110:
545 val = E_MSP430_MACH_MSP430x11x1;
549 val = E_MSP430_MACH_MSP430x11;
553 val = E_MSP430_MACH_MSP430x12;
557 val = E_MSP430_MACH_MSP430x13;
561 val = E_MSP430_MACH_MSP430x14;
565 val = E_MSP430_MACH_MSP430x15;
569 val = E_MSP430_MACH_MSP430x16;
573 val = E_MSP430_MACH_MSP430x31;
577 val = E_MSP430_MACH_MSP430x32;
581 val = E_MSP430_MACH_MSP430x33;
585 val = E_MSP430_MACH_MSP430x41;
589 val = E_MSP430_MACH_MSP430x42;
593 val = E_MSP430_MACH_MSP430x43;
597 val = E_MSP430_MACH_MSP430x44;
601 elf_elfheader (abfd)->e_machine = EM_MSP430;
602 elf_elfheader (abfd)->e_flags &= ~EF_MSP430_MACH;
603 elf_elfheader (abfd)->e_flags |= val;
606 /* Set the right machine number. */
609 elf32_msp430_object_p (bfd * abfd)
611 int e_set = bfd_mach_msp14;
613 if (elf_elfheader (abfd)->e_machine == EM_MSP430
614 || elf_elfheader (abfd)->e_machine == EM_MSP430_OLD)
616 int e_mach = elf_elfheader (abfd)->e_flags & EF_MSP430_MACH;
621 case E_MSP430_MACH_MSP430x11:
622 e_set = bfd_mach_msp11;
625 case E_MSP430_MACH_MSP430x11x1:
626 e_set = bfd_mach_msp110;
629 case E_MSP430_MACH_MSP430x12:
630 e_set = bfd_mach_msp12;
633 case E_MSP430_MACH_MSP430x13:
634 e_set = bfd_mach_msp13;
637 case E_MSP430_MACH_MSP430x14:
638 e_set = bfd_mach_msp14;
641 case E_MSP430_MACH_MSP430x15:
642 e_set = bfd_mach_msp15;
645 case E_MSP430_MACH_MSP430x16:
646 e_set = bfd_mach_msp16;
649 case E_MSP430_MACH_MSP430x31:
650 e_set = bfd_mach_msp31;
653 case E_MSP430_MACH_MSP430x32:
654 e_set = bfd_mach_msp32;
657 case E_MSP430_MACH_MSP430x33:
658 e_set = bfd_mach_msp33;
661 case E_MSP430_MACH_MSP430x41:
662 e_set = bfd_mach_msp41;
665 case E_MSP430_MACH_MSP430x42:
666 e_set = bfd_mach_msp42;
669 case E_MSP430_MACH_MSP430x43:
670 e_set = bfd_mach_msp43;
673 case E_MSP430_MACH_MSP430x44:
674 e_set = bfd_mach_msp44;
679 return bfd_default_set_arch_mach (abfd, bfd_arch_msp430, e_set);
683 elf32_msp430_post_process_headers (bfd * abfd,
684 struct bfd_link_info * link_info ATTRIBUTE_UNUSED)
686 Elf_Internal_Ehdr * i_ehdrp; /* ELF file header, internal form. */
688 i_ehdrp = elf_elfheader (abfd);
690 #ifndef ELFOSABI_STANDALONE
691 #define ELFOSABI_STANDALONE 255
694 i_ehdrp->e_ident[EI_OSABI] = ELFOSABI_STANDALONE;
697 /* These functions handle relaxing for the msp430.
698 Relaxation required only in two cases:
699 - Bad hand coding like jumps from one section to another or
701 - Sibling calls. This will affect onlu 'jump label' polymorph. Without
702 relaxing this enlarges code by 2 bytes. Sibcalls implemented but
703 do not work in gcc's port by the reason I do not know.
704 Anyway, if a relaxation required, user should pass -relax option to the
707 There are quite a few relaxing opportunities available on the msp430:
709 ================================================================
713 eq == jeq label jne +4; br lab
714 ne != jne label jeq +4; br lab
715 lt < jl label jge +4; br lab
716 ltu < jlo label lhs +4; br lab
717 ge >= jge label jl +4; br lab
718 geu >= jhs label jlo +4; br lab
722 ltn < jn jn +2; jmp +4; br lab
724 3. 4 words -> 2 words
726 gt > jeq +2; jge label jeq +6; jl +4; br label
727 gtu > jeq +2; jhs label jeq +6; jlo +4; br label
729 4. 4 words -> 2 words and 2 labels
731 leu <= jeq label; jlo label jeq +2; jhs +4; br label
732 le <= jeq label; jl label jeq +2; jge +4; br label
733 =================================================================
735 codemap for first cases is (labels masked ):
736 eq: 0x2002,0x4010,0x0000 -> 0x2400
737 ne: 0x2402,0x4010,0x0000 -> 0x2000
738 lt: 0x3402,0x4010,0x0000 -> 0x3800
739 ltu: 0x2c02,0x4010,0x0000 -> 0x2800
740 ge: 0x3802,0x4010,0x0000 -> 0x3400
741 geu: 0x2802,0x4010,0x0000 -> 0x2c00
744 ltn: 0x3001,0x3c02,0x4010,0x0000 -> 0x3000
747 gt: 0x2403,0x3802,0x4010,0x0000 -> 0x2401,0x3400
748 gtu: 0x2403,0x2802,0x4010,0x0000 -> 0x2401,0x2c00
751 leu: 0x2401,0x2c02,0x4010,0x0000 -> 0x2400,0x2800
752 le: 0x2401,0x3402,0x4010,0x0000 -> 0x2400,0x3800
755 jump: 0x4010,0x0000 -> 0x3c00. */
757 #define NUMB_RELAX_CODES 12
758 static struct rcodes_s
760 int f0, f1; /* From code. */
761 int t0, t1; /* To code. */
762 int labels; /* Position of labels: 1 - one label at first
763 word, 2 - one at second word, 3 - two
765 int cdx; /* Words to match. */
766 int bs; /* Shrink bytes. */
767 int off; /* Offset from old label for new code. */
768 int ncl; /* New code length. */
770 {/* lab,cdx,bs,off,ncl */
771 { 0x0000, 0x0000, 0x3c00, 0x0000, 1, 0, 2, 2, 2}, /* jump */
772 { 0x0000, 0x2002, 0x2400, 0x0000, 1, 1, 4, 4, 2}, /* eq */
773 { 0x0000, 0x2402, 0x2000, 0x0000, 1, 1, 4, 4, 2}, /* ne */
774 { 0x0000, 0x3402, 0x3800, 0x0000, 1, 1, 4, 4, 2}, /* lt */
775 { 0x0000, 0x2c02, 0x2800, 0x0000, 1, 1, 4, 4, 2}, /* ltu */
776 { 0x0000, 0x3802, 0x3400, 0x0000, 1, 1, 4, 4, 2}, /* ge */
777 { 0x0000, 0x2802, 0x2c00, 0x0000, 1, 1, 4, 4, 2}, /* geu */
778 { 0x3001, 0x3c02, 0x3000, 0x0000, 1, 2, 6, 6, 2}, /* ltn */
779 { 0x2403, 0x3802, 0x2401, 0x3400, 2, 2, 4, 6, 4}, /* gt */
780 { 0x2403, 0x2802, 0x2401, 0x2c00, 2, 2, 4, 6, 4}, /* gtu */
781 { 0x2401, 0x2c02, 0x2400, 0x2800, 3, 2, 4, 6, 4}, /* leu , 2 labels */
782 { 0x2401, 0x2c02, 0x2400, 0x2800, 3, 2, 4, 6, 4}, /* le , 2 labels */
783 { 0, 0, 0, 0, 0, 0, 0, 0, 0}
786 /* Return TRUE if a symbol exists at the given address. */
789 msp430_elf_symbol_address_p (bfd * abfd,
791 Elf_Internal_Sym * isym,
794 Elf_Internal_Shdr *symtab_hdr;
795 unsigned int sec_shndx;
796 Elf_Internal_Sym *isymend;
797 struct elf_link_hash_entry **sym_hashes;
798 struct elf_link_hash_entry **end_hashes;
799 unsigned int symcount;
801 sec_shndx = _bfd_elf_section_from_bfd_section (abfd, sec);
803 /* Examine all the local symbols. */
804 symtab_hdr = &elf_tdata (abfd)->symtab_hdr;
805 for (isymend = isym + symtab_hdr->sh_info; isym < isymend; isym++)
806 if (isym->st_shndx == sec_shndx && isym->st_value == addr)
809 symcount = (symtab_hdr->sh_size / sizeof (Elf32_External_Sym)
810 - symtab_hdr->sh_info);
811 sym_hashes = elf_sym_hashes (abfd);
812 end_hashes = sym_hashes + symcount;
813 for (; sym_hashes < end_hashes; sym_hashes++)
815 struct elf_link_hash_entry *sym_hash = *sym_hashes;
817 if ((sym_hash->root.type == bfd_link_hash_defined
818 || sym_hash->root.type == bfd_link_hash_defweak)
819 && sym_hash->root.u.def.section == sec
820 && sym_hash->root.u.def.value == addr)
827 /* Delete some bytes from a section while relaxing. */
830 msp430_elf_relax_delete_bytes (bfd * abfd, asection * sec, bfd_vma addr,
833 Elf_Internal_Shdr *symtab_hdr;
834 unsigned int sec_shndx;
836 Elf_Internal_Rela *irel;
837 Elf_Internal_Rela *irelend;
838 Elf_Internal_Rela *irelalign;
840 Elf_Internal_Sym *isym;
841 Elf_Internal_Sym *isymend;
842 struct elf_link_hash_entry **sym_hashes;
843 struct elf_link_hash_entry **end_hashes;
844 unsigned int symcount;
846 sec_shndx = _bfd_elf_section_from_bfd_section (abfd, sec);
848 contents = elf_section_data (sec)->this_hdr.contents;
850 /* The deletion must stop at the next ALIGN reloc for an aligment
851 power larger than the number of bytes we are deleting. */
856 irel = elf_section_data (sec)->relocs;
857 irelend = irel + sec->reloc_count;
859 /* Actually delete the bytes. */
860 memmove (contents + addr, contents + addr + count,
861 (size_t) (toaddr - addr - count));
864 /* Adjust all the relocs. */
865 for (irel = elf_section_data (sec)->relocs; irel < irelend; irel++)
866 /* Get the new reloc address. */
867 if ((irel->r_offset > addr && irel->r_offset < toaddr))
868 irel->r_offset -= count;
870 /* Adjust the local symbols defined in this section. */
871 symtab_hdr = & elf_tdata (abfd)->symtab_hdr;
872 isym = (Elf_Internal_Sym *) symtab_hdr->contents;
873 for (isymend = isym + symtab_hdr->sh_info; isym < isymend; isym++)
874 if (isym->st_shndx == sec_shndx
875 && isym->st_value > addr && isym->st_value < toaddr)
876 isym->st_value -= count;
878 /* Now adjust the global symbols defined in this section. */
879 symcount = (symtab_hdr->sh_size / sizeof (Elf32_External_Sym)
880 - symtab_hdr->sh_info);
881 sym_hashes = elf_sym_hashes (abfd);
882 end_hashes = sym_hashes + symcount;
883 for (; sym_hashes < end_hashes; sym_hashes++)
885 struct elf_link_hash_entry *sym_hash = *sym_hashes;
887 if ((sym_hash->root.type == bfd_link_hash_defined
888 || sym_hash->root.type == bfd_link_hash_defweak)
889 && sym_hash->root.u.def.section == sec
890 && sym_hash->root.u.def.value > addr
891 && sym_hash->root.u.def.value < toaddr)
892 sym_hash->root.u.def.value -= count;
900 msp430_elf_relax_section (bfd * abfd, asection * sec,
901 struct bfd_link_info * link_info,
904 Elf_Internal_Shdr * symtab_hdr;
905 Elf_Internal_Rela * internal_relocs;
906 Elf_Internal_Rela * irel;
907 Elf_Internal_Rela * irelend;
908 bfd_byte * contents = NULL;
909 Elf_Internal_Sym * isymbuf = NULL;
911 /* Assume nothing changes. */
914 /* We don't have to do anything for a relocatable link, if
915 this section does not have relocs, or if this is not a
917 if (link_info->relocatable
918 || (sec->flags & SEC_RELOC) == 0
919 || sec->reloc_count == 0 || (sec->flags & SEC_CODE) == 0)
922 symtab_hdr = & elf_tdata (abfd)->symtab_hdr;
924 /* Get a copy of the native relocations. */
926 _bfd_elf_link_read_relocs (abfd, sec, NULL, NULL, link_info->keep_memory);
927 if (internal_relocs == NULL)
930 /* Walk through them looking for relaxing opportunities. */
931 irelend = internal_relocs + sec->reloc_count;
932 for (irel = internal_relocs; irel < irelend; irel++)
936 /* If this isn't something that can be relaxed, then ignore
938 if (ELF32_R_TYPE (irel->r_info) != (int) R_MSP430_RL_PCREL)
941 /* Get the section contents if we haven't done so already. */
942 if (contents == NULL)
944 /* Get cached copy if it exists. */
945 if (elf_section_data (sec)->this_hdr.contents != NULL)
946 contents = elf_section_data (sec)->this_hdr.contents;
947 else if (! bfd_malloc_and_get_section (abfd, sec, &contents))
951 /* Read this BFD's local symbols if we haven't done so already. */
952 if (isymbuf == NULL && symtab_hdr->sh_info != 0)
954 isymbuf = (Elf_Internal_Sym *) symtab_hdr->contents;
956 isymbuf = bfd_elf_get_elf_syms (abfd, symtab_hdr,
957 symtab_hdr->sh_info, 0,
963 /* Get the value of the symbol referred to by the reloc. */
964 if (ELF32_R_SYM (irel->r_info) < symtab_hdr->sh_info)
966 /* A local symbol. */
967 Elf_Internal_Sym *isym;
970 isym = isymbuf + ELF32_R_SYM (irel->r_info);
971 if (isym->st_shndx == SHN_UNDEF)
972 sym_sec = bfd_und_section_ptr;
973 else if (isym->st_shndx == SHN_ABS)
974 sym_sec = bfd_abs_section_ptr;
975 else if (isym->st_shndx == SHN_COMMON)
976 sym_sec = bfd_com_section_ptr;
978 sym_sec = bfd_section_from_elf_index (abfd, isym->st_shndx);
979 symval = (isym->st_value
980 + sym_sec->output_section->vma + sym_sec->output_offset);
985 struct elf_link_hash_entry *h;
987 /* An external symbol. */
988 indx = ELF32_R_SYM (irel->r_info) - symtab_hdr->sh_info;
989 h = elf_sym_hashes (abfd)[indx];
990 BFD_ASSERT (h != NULL);
992 if (h->root.type != bfd_link_hash_defined
993 && h->root.type != bfd_link_hash_defweak)
994 /* This appears to be a reference to an undefined
995 symbol. Just ignore it--it will be caught by the
996 regular reloc processing. */
999 symval = (h->root.u.def.value
1000 + h->root.u.def.section->output_section->vma
1001 + h->root.u.def.section->output_offset);
1004 /* For simplicity of coding, we are going to modify the section
1005 contents, the section relocs, and the BFD symbol table. We
1006 must tell the rest of the code not to free up this
1007 information. It would be possible to instead create a table
1008 of changes which have to be made, as is done in coff-mips.c;
1009 that would be more work, but would require less memory when
1010 the linker is run. */
1012 /* Try to turn a 16bit pc-relative branch into a 10bit pc-relative
1014 /* Paranoia? paranoia... */
1015 if (ELF32_R_TYPE (irel->r_info) == (int) R_MSP430_RL_PCREL)
1017 bfd_vma value = symval;
1019 /* Deal with pc-relative gunk. */
1020 value -= (sec->output_section->vma + sec->output_offset);
1021 value -= irel->r_offset;
1022 value += irel->r_addend;
1024 /* See if the value will fit in 10 bits, note the high value is
1025 1016 as the target will be two bytes closer if we are
1027 if ((long) value < 1016 && (long) value > -1016)
1029 int code0 = 0, code1 = 0, code2 = 0;
1031 struct rcodes_s *rx;
1033 /* Get the opcode. */
1034 if (irel->r_offset >= 6)
1035 code0 = bfd_get_16 (abfd, contents + irel->r_offset - 6);
1037 if (irel->r_offset >= 4)
1038 code1 = bfd_get_16 (abfd, contents + irel->r_offset - 4);
1040 code2 = bfd_get_16 (abfd, contents + irel->r_offset - 2);
1042 if (code2 != 0x4010)
1045 /* Check r4 and r3. */
1046 for (i = NUMB_RELAX_CODES - 1; i >= 0; i--)
1049 if (rx->cdx == 2 && rx->f0 == code0 && rx->f1 == code1)
1051 else if (rx->cdx == 1 && rx->f1 == code1)
1053 else if (rx->cdx == 0) /* This is an unconditional jump. */
1058 .Label0: ; we do not care about this label
1060 .Label1: ; make sure there is no label here
1062 .Label2: ; make sure there is no label here
1065 So, if there is .Label1 or .Label2 we cannot relax this code.
1066 This actually should not happen, cause for relaxable
1067 instructions we use RL_PCREL reloc instead of 16_PCREL.
1068 Will change this in the future. */
1071 && msp430_elf_symbol_address_p (abfd, sec, isymbuf,
1072 irel->r_offset - 2))
1075 && msp430_elf_symbol_address_p (abfd, sec, isymbuf,
1076 irel->r_offset - 4))
1079 /* Note that we've changed the relocs, section contents, etc. */
1080 elf_section_data (sec)->relocs = internal_relocs;
1081 elf_section_data (sec)->this_hdr.contents = contents;
1082 symtab_hdr->contents = (unsigned char *) isymbuf;
1084 /* Fix the relocation's type. */
1085 if (rx->labels == 3) /* Handle special cases. */
1086 irel->r_info = ELF32_R_INFO (ELF32_R_SYM (irel->r_info),
1089 irel->r_info = ELF32_R_INFO (ELF32_R_SYM (irel->r_info),
1092 /* Fix the opcode right way. */
1093 bfd_put_16 (abfd, rx->t0, contents + irel->r_offset - rx->off);
1095 bfd_put_16 (abfd, rx->t1,
1096 contents + irel->r_offset - rx->off + 2);
1099 if (!msp430_elf_relax_delete_bytes (abfd, sec,
1100 irel->r_offset - rx->off +
1104 /* Handle unconditional jumps. */
1106 irel->r_offset -= 2;
1108 /* That will change things, so, we should relax again.
1109 Note that this is not required, and it may be slow. */
1115 if (isymbuf != NULL && symtab_hdr->contents != (unsigned char *) isymbuf)
1117 if (!link_info->keep_memory)
1121 /* Cache the symbols for elf_link_input_bfd. */
1122 symtab_hdr->contents = (unsigned char *) isymbuf;
1126 if (contents != NULL
1127 && elf_section_data (sec)->this_hdr.contents != contents)
1129 if (!link_info->keep_memory)
1133 /* Cache the section contents for elf_link_input_bfd. */
1134 elf_section_data (sec)->this_hdr.contents = contents;
1138 if (internal_relocs != NULL
1139 && elf_section_data (sec)->relocs != internal_relocs)
1140 free (internal_relocs);
1145 if (isymbuf != NULL && symtab_hdr->contents != (unsigned char *) isymbuf)
1147 if (contents != NULL
1148 && elf_section_data (sec)->this_hdr.contents != contents)
1150 if (internal_relocs != NULL
1151 && elf_section_data (sec)->relocs != internal_relocs)
1152 free (internal_relocs);
1158 #define ELF_ARCH bfd_arch_msp430
1159 #define ELF_MACHINE_CODE EM_MSP430
1160 #define ELF_MACHINE_ALT1 EM_MSP430_OLD
1161 #define ELF_MAXPAGESIZE 1
1163 #define TARGET_LITTLE_SYM bfd_elf32_msp430_vec
1164 #define TARGET_LITTLE_NAME "elf32-msp430"
1166 #define elf_info_to_howto msp430_info_to_howto_rela
1167 #define elf_info_to_howto_rel NULL
1168 #define elf_backend_relocate_section elf32_msp430_relocate_section
1169 #define elf_backend_gc_mark_hook elf32_msp430_gc_mark_hook
1170 #define elf_backend_gc_sweep_hook elf32_msp430_gc_sweep_hook
1171 #define elf_backend_check_relocs elf32_msp430_check_relocs
1172 #define elf_backend_can_gc_sections 1
1173 #define elf_backend_final_write_processing bfd_elf_msp430_final_write_processing
1174 #define elf_backend_object_p elf32_msp430_object_p
1175 #define elf_backend_post_process_headers elf32_msp430_post_process_headers
1176 #define bfd_elf32_bfd_relax_section msp430_elf_relax_section
1178 #include "elf32-target.h"