1 /* MSP430-specific support for 32-bit ELF
2 Copyright (C) 2002, 2003, 2004, 2005, 2006, 2007, 2010, 2012
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 3 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,
21 MA 02110-1301, USA. */
25 #include "libiberty.h"
28 #include "elf/msp430.h"
30 /* Use RELA instead of REL. */
33 static reloc_howto_type elf_msp430_howto_table[] =
35 HOWTO (R_MSP430_NONE, /* type */
37 2, /* size (0 = byte, 1 = short, 2 = long) */
39 FALSE, /* pc_relative */
41 complain_overflow_bitfield,/* complain_on_overflow */
42 bfd_elf_generic_reloc, /* special_function */
43 "R_MSP430_NONE", /* name */
44 FALSE, /* partial_inplace */
47 FALSE), /* pcrel_offset */
49 HOWTO (R_MSP430_32, /* type */
51 2, /* size (0 = byte, 1 = short, 2 = long) */
53 FALSE, /* pc_relative */
55 complain_overflow_bitfield,/* complain_on_overflow */
56 bfd_elf_generic_reloc, /* special_function */
57 "R_MSP430_32", /* name */
58 FALSE, /* partial_inplace */
59 0xffffffff, /* src_mask */
60 0xffffffff, /* dst_mask */
61 FALSE), /* pcrel_offset */
63 /* A 13 bit PC relative relocation. */
64 HOWTO (R_MSP430_10_PCREL, /* type */
66 1, /* size (0 = byte, 1 = short, 2 = long) */
68 TRUE, /* pc_relative */
70 complain_overflow_bitfield,/* complain_on_overflow */
71 bfd_elf_generic_reloc, /* special_function */
72 "R_MSP430_13_PCREL", /* name */
73 FALSE, /* partial_inplace */
76 TRUE), /* pcrel_offset */
78 /* A 16 bit absolute relocation. */
79 HOWTO (R_MSP430_16, /* type */
81 1, /* size (0 = byte, 1 = short, 2 = long) */
83 FALSE, /* pc_relative */
85 complain_overflow_dont,/* complain_on_overflow */
86 bfd_elf_generic_reloc, /* special_function */
87 "R_MSP430_16", /* name */
88 FALSE, /* partial_inplace */
90 0xffff, /* dst_mask */
91 FALSE), /* pcrel_offset */
93 /* A 16 bit absolute relocation for command address. */
94 HOWTO (R_MSP430_16_PCREL, /* type */
96 1, /* size (0 = byte, 1 = short, 2 = long) */
98 TRUE, /* pc_relative */
100 complain_overflow_dont,/* complain_on_overflow */
101 bfd_elf_generic_reloc, /* special_function */
102 "R_MSP430_16_PCREL", /* name */
103 FALSE, /* partial_inplace */
105 0xffff, /* dst_mask */
106 TRUE), /* pcrel_offset */
108 /* A 16 bit absolute relocation, byte operations. */
109 HOWTO (R_MSP430_16_BYTE, /* type */
111 1, /* size (0 = byte, 1 = short, 2 = long) */
113 FALSE, /* pc_relative */
115 complain_overflow_dont,/* complain_on_overflow */
116 bfd_elf_generic_reloc, /* special_function */
117 "R_MSP430_16_BYTE", /* name */
118 FALSE, /* partial_inplace */
119 0xffff, /* src_mask */
120 0xffff, /* dst_mask */
121 FALSE), /* pcrel_offset */
123 /* A 16 bit absolute relocation for command address. */
124 HOWTO (R_MSP430_16_PCREL_BYTE,/* type */
126 1, /* size (0 = byte, 1 = short, 2 = long) */
128 TRUE, /* pc_relative */
130 complain_overflow_dont,/* complain_on_overflow */
131 bfd_elf_generic_reloc, /* special_function */
132 "R_MSP430_16_PCREL_BYTE",/* name */
133 FALSE, /* partial_inplace */
134 0xffff, /* src_mask */
135 0xffff, /* dst_mask */
136 TRUE), /* pcrel_offset */
138 /* A 13 bit PC relative relocation for complicated polymorphs. */
139 HOWTO (R_MSP430_2X_PCREL, /* type */
141 2, /* size (0 = byte, 1 = short, 2 = long) */
143 TRUE, /* pc_relative */
145 complain_overflow_bitfield,/* complain_on_overflow */
146 bfd_elf_generic_reloc, /* special_function */
147 "R_MSP430_2X_PCREL", /* name */
148 FALSE, /* partial_inplace */
149 0xfff, /* src_mask */
150 0xfff, /* dst_mask */
151 TRUE), /* pcrel_offset */
153 /* A 16 bit relaxable relocation for command address. */
154 HOWTO (R_MSP430_RL_PCREL, /* type */
156 1, /* size (0 = byte, 1 = short, 2 = long) */
158 TRUE, /* pc_relative */
160 complain_overflow_dont,/* complain_on_overflow */
161 bfd_elf_generic_reloc, /* special_function */
162 "R_MSP430_RL_PCREL", /* name */
163 FALSE, /* partial_inplace */
165 0xffff, /* dst_mask */
166 TRUE) /* pcrel_offset */
169 /* Map BFD reloc types to MSP430 ELF reloc types. */
171 struct msp430_reloc_map
173 bfd_reloc_code_real_type bfd_reloc_val;
174 unsigned int elf_reloc_val;
177 static const struct msp430_reloc_map msp430_reloc_map[] =
179 {BFD_RELOC_NONE, R_MSP430_NONE},
180 {BFD_RELOC_32, R_MSP430_32},
181 {BFD_RELOC_MSP430_10_PCREL, R_MSP430_10_PCREL},
182 {BFD_RELOC_16, R_MSP430_16_BYTE},
183 {BFD_RELOC_MSP430_16_PCREL, R_MSP430_16_PCREL},
184 {BFD_RELOC_MSP430_16, R_MSP430_16},
185 {BFD_RELOC_MSP430_16_PCREL_BYTE, R_MSP430_16_PCREL_BYTE},
186 {BFD_RELOC_MSP430_16_BYTE, R_MSP430_16_BYTE},
187 {BFD_RELOC_MSP430_2X_PCREL, R_MSP430_2X_PCREL},
188 {BFD_RELOC_MSP430_RL_PCREL, R_MSP430_RL_PCREL}
191 static reloc_howto_type *
192 bfd_elf32_bfd_reloc_type_lookup (bfd * abfd ATTRIBUTE_UNUSED,
193 bfd_reloc_code_real_type code)
197 for (i = 0; i < ARRAY_SIZE (msp430_reloc_map); i++)
198 if (msp430_reloc_map[i].bfd_reloc_val == code)
199 return &elf_msp430_howto_table[msp430_reloc_map[i].elf_reloc_val];
204 static reloc_howto_type *
205 bfd_elf32_bfd_reloc_name_lookup (bfd *abfd ATTRIBUTE_UNUSED,
211 i < (sizeof (elf_msp430_howto_table)
212 / sizeof (elf_msp430_howto_table[0]));
214 if (elf_msp430_howto_table[i].name != NULL
215 && strcasecmp (elf_msp430_howto_table[i].name, r_name) == 0)
216 return &elf_msp430_howto_table[i];
221 /* Set the howto pointer for an MSP430 ELF reloc. */
224 msp430_info_to_howto_rela (bfd * abfd ATTRIBUTE_UNUSED,
226 Elf_Internal_Rela * dst)
230 r_type = ELF32_R_TYPE (dst->r_info);
231 BFD_ASSERT (r_type < (unsigned int) R_MSP430_max);
232 cache_ptr->howto = &elf_msp430_howto_table[r_type];
235 /* Look through the relocs for a section during the first phase.
236 Since we don't do .gots or .plts, we just need to consider the
237 virtual table relocs for gc. */
240 elf32_msp430_check_relocs (bfd * abfd, struct bfd_link_info * info,
241 asection * sec, const Elf_Internal_Rela * relocs)
243 Elf_Internal_Shdr *symtab_hdr;
244 struct elf_link_hash_entry **sym_hashes;
245 const Elf_Internal_Rela *rel;
246 const Elf_Internal_Rela *rel_end;
248 if (info->relocatable)
251 symtab_hdr = &elf_tdata (abfd)->symtab_hdr;
252 sym_hashes = elf_sym_hashes (abfd);
254 rel_end = relocs + sec->reloc_count;
255 for (rel = relocs; rel < rel_end; rel++)
257 struct elf_link_hash_entry *h;
258 unsigned long r_symndx;
260 r_symndx = ELF32_R_SYM (rel->r_info);
261 if (r_symndx < symtab_hdr->sh_info)
265 h = sym_hashes[r_symndx - symtab_hdr->sh_info];
266 while (h->root.type == bfd_link_hash_indirect
267 || h->root.type == bfd_link_hash_warning)
268 h = (struct elf_link_hash_entry *) h->root.u.i.link;
275 /* Perform a single relocation. By default we use the standard BFD
276 routines, but a few relocs, we have to do them ourselves. */
278 static bfd_reloc_status_type
279 msp430_final_link_relocate (reloc_howto_type * howto, bfd * input_bfd,
280 asection * input_section, bfd_byte * contents,
281 Elf_Internal_Rela * rel, bfd_vma relocation)
283 bfd_reloc_status_type r = bfd_reloc_ok;
289 case R_MSP430_10_PCREL:
290 contents += rel->r_offset;
291 srel = (bfd_signed_vma) relocation;
292 srel += rel->r_addend;
293 srel -= rel->r_offset;
294 srel -= 2; /* Branch instructions add 2 to the PC... */
295 srel -= (input_section->output_section->vma +
296 input_section->output_offset);
299 return bfd_reloc_outofrange;
301 /* MSP430 addresses commands as words. */
304 /* Check for an overflow. */
305 if (srel < -512 || srel > 511)
306 return bfd_reloc_overflow;
308 x = bfd_get_16 (input_bfd, contents);
309 x = (x & 0xfc00) | (srel & 0x3ff);
310 bfd_put_16 (input_bfd, x, contents);
313 case R_MSP430_2X_PCREL:
314 contents += rel->r_offset;
315 srel = (bfd_signed_vma) relocation;
316 srel += rel->r_addend;
317 srel -= rel->r_offset;
318 srel -= 2; /* Branch instructions add 2 to the PC... */
319 srel -= (input_section->output_section->vma +
320 input_section->output_offset);
323 return bfd_reloc_outofrange;
325 /* MSP430 addresses commands as words. */
328 /* Check for an overflow. */
329 if (srel < -512 || srel > 511)
330 return bfd_reloc_overflow;
332 x = bfd_get_16 (input_bfd, contents);
333 x = (x & 0xfc00) | (srel & 0x3ff);
334 bfd_put_16 (input_bfd, x, contents);
335 /* Handle second jump instruction. */
336 x = bfd_get_16 (input_bfd, contents - 2);
338 x = (x & 0xfc00) | (srel & 0x3ff);
339 bfd_put_16 (input_bfd, x, contents - 2);
342 case R_MSP430_16_PCREL:
343 case R_MSP430_RL_PCREL:
344 contents += rel->r_offset;
345 srel = (bfd_signed_vma) relocation;
346 srel += rel->r_addend;
347 srel -= rel->r_offset;
348 /* Only branch instructions add 2 to the PC... */
349 srel -= (input_section->output_section->vma +
350 input_section->output_offset);
353 return bfd_reloc_outofrange;
355 bfd_put_16 (input_bfd, srel & 0xffff, contents);
358 case R_MSP430_16_PCREL_BYTE:
359 contents += rel->r_offset;
360 srel = (bfd_signed_vma) relocation;
361 srel += rel->r_addend;
362 srel -= rel->r_offset;
363 /* Only branch instructions add 2 to the PC... */
364 srel -= (input_section->output_section->vma +
365 input_section->output_offset);
367 bfd_put_16 (input_bfd, srel & 0xffff, contents);
370 case R_MSP430_16_BYTE:
371 contents += rel->r_offset;
372 srel = (bfd_signed_vma) relocation;
373 srel += rel->r_addend;
374 bfd_put_16 (input_bfd, srel & 0xffff, contents);
378 contents += rel->r_offset;
379 srel = (bfd_signed_vma) relocation;
380 srel += rel->r_addend;
383 return bfd_reloc_notsupported;
385 bfd_put_16 (input_bfd, srel & 0xffff, contents);
389 r = _bfd_final_link_relocate (howto, input_bfd, input_section,
390 contents, rel->r_offset,
391 relocation, rel->r_addend);
397 /* Relocate an MSP430 ELF section. */
400 elf32_msp430_relocate_section (bfd * output_bfd ATTRIBUTE_UNUSED,
401 struct bfd_link_info * info,
403 asection * input_section,
405 Elf_Internal_Rela * relocs,
406 Elf_Internal_Sym * local_syms,
407 asection ** local_sections)
409 Elf_Internal_Shdr *symtab_hdr;
410 struct elf_link_hash_entry **sym_hashes;
411 Elf_Internal_Rela *rel;
412 Elf_Internal_Rela *relend;
414 symtab_hdr = &elf_tdata (input_bfd)->symtab_hdr;
415 sym_hashes = elf_sym_hashes (input_bfd);
416 relend = relocs + input_section->reloc_count;
418 for (rel = relocs; rel < relend; rel++)
420 reloc_howto_type *howto;
421 unsigned long r_symndx;
422 Elf_Internal_Sym *sym;
424 struct elf_link_hash_entry *h;
426 bfd_reloc_status_type r;
427 const char *name = NULL;
430 r_type = ELF32_R_TYPE (rel->r_info);
431 r_symndx = ELF32_R_SYM (rel->r_info);
432 howto = elf_msp430_howto_table + r_type;
437 if (r_symndx < symtab_hdr->sh_info)
439 sym = local_syms + r_symndx;
440 sec = local_sections[r_symndx];
441 relocation = _bfd_elf_rela_local_sym (output_bfd, sym, &sec, rel);
443 name = bfd_elf_string_from_elf_section
444 (input_bfd, symtab_hdr->sh_link, sym->st_name);
445 name = (name == NULL) ? bfd_section_name (input_bfd, sec) : name;
449 bfd_boolean unresolved_reloc, warned;
451 RELOC_FOR_GLOBAL_SYMBOL (info, input_bfd, input_section, rel,
452 r_symndx, symtab_hdr, sym_hashes,
454 unresolved_reloc, warned);
457 if (sec != NULL && discarded_section (sec))
458 RELOC_AGAINST_DISCARDED_SECTION (info, input_bfd, input_section,
459 rel, 1, relend, howto, 0, contents);
461 if (info->relocatable)
464 r = msp430_final_link_relocate (howto, input_bfd, input_section,
465 contents, rel, relocation);
467 if (r != bfd_reloc_ok)
469 const char *msg = (const char *) NULL;
473 case bfd_reloc_overflow:
474 r = info->callbacks->reloc_overflow
475 (info, (h ? &h->root : NULL), name, howto->name,
476 (bfd_vma) 0, input_bfd, input_section,
480 case bfd_reloc_undefined:
481 r = info->callbacks->undefined_symbol
482 (info, name, input_bfd, input_section, rel->r_offset, TRUE);
485 case bfd_reloc_outofrange:
486 msg = _("internal error: out of range error");
489 case bfd_reloc_notsupported:
490 msg = _("internal error: unsupported relocation error");
493 case bfd_reloc_dangerous:
494 msg = _("internal error: dangerous relocation");
498 msg = _("internal error: unknown error");
503 r = info->callbacks->warning
504 (info, msg, name, input_bfd, input_section, rel->r_offset);
515 /* The final processing done just before writing out a MSP430 ELF object
516 file. This gets the MSP430 architecture right based on the machine
520 bfd_elf_msp430_final_write_processing (bfd * abfd,
521 bfd_boolean linker ATTRIBUTE_UNUSED)
525 switch (bfd_get_mach (abfd))
528 case bfd_mach_msp110:
529 val = E_MSP430_MACH_MSP430x11x1;
533 val = E_MSP430_MACH_MSP430x11;
537 val = E_MSP430_MACH_MSP430x12;
541 val = E_MSP430_MACH_MSP430x13;
545 val = E_MSP430_MACH_MSP430x14;
549 val = E_MSP430_MACH_MSP430x15;
553 val = E_MSP430_MACH_MSP430x16;
557 val = E_MSP430_MACH_MSP430x31;
561 val = E_MSP430_MACH_MSP430x32;
565 val = E_MSP430_MACH_MSP430x33;
569 val = E_MSP430_MACH_MSP430x41;
573 val = E_MSP430_MACH_MSP430x42;
577 val = E_MSP430_MACH_MSP430x43;
581 val = E_MSP430_MACH_MSP430x44;
585 elf_elfheader (abfd)->e_machine = EM_MSP430;
586 elf_elfheader (abfd)->e_flags &= ~EF_MSP430_MACH;
587 elf_elfheader (abfd)->e_flags |= val;
590 /* Set the right machine number. */
593 elf32_msp430_object_p (bfd * abfd)
595 int e_set = bfd_mach_msp14;
597 if (elf_elfheader (abfd)->e_machine == EM_MSP430
598 || elf_elfheader (abfd)->e_machine == EM_MSP430_OLD)
600 int e_mach = elf_elfheader (abfd)->e_flags & EF_MSP430_MACH;
605 case E_MSP430_MACH_MSP430x11:
606 e_set = bfd_mach_msp11;
609 case E_MSP430_MACH_MSP430x11x1:
610 e_set = bfd_mach_msp110;
613 case E_MSP430_MACH_MSP430x12:
614 e_set = bfd_mach_msp12;
617 case E_MSP430_MACH_MSP430x13:
618 e_set = bfd_mach_msp13;
621 case E_MSP430_MACH_MSP430x14:
622 e_set = bfd_mach_msp14;
625 case E_MSP430_MACH_MSP430x15:
626 e_set = bfd_mach_msp15;
629 case E_MSP430_MACH_MSP430x16:
630 e_set = bfd_mach_msp16;
633 case E_MSP430_MACH_MSP430x31:
634 e_set = bfd_mach_msp31;
637 case E_MSP430_MACH_MSP430x32:
638 e_set = bfd_mach_msp32;
641 case E_MSP430_MACH_MSP430x33:
642 e_set = bfd_mach_msp33;
645 case E_MSP430_MACH_MSP430x41:
646 e_set = bfd_mach_msp41;
649 case E_MSP430_MACH_MSP430x42:
650 e_set = bfd_mach_msp42;
653 case E_MSP430_MACH_MSP430x43:
654 e_set = bfd_mach_msp43;
657 case E_MSP430_MACH_MSP430x44:
658 e_set = bfd_mach_msp44;
663 return bfd_default_set_arch_mach (abfd, bfd_arch_msp430, e_set);
666 /* These functions handle relaxing for the msp430.
667 Relaxation required only in two cases:
668 - Bad hand coding like jumps from one section to another or
670 - Sibling calls. This will affect onlu 'jump label' polymorph. Without
671 relaxing this enlarges code by 2 bytes. Sibcalls implemented but
672 do not work in gcc's port by the reason I do not know.
673 Anyway, if a relaxation required, user should pass -relax option to the
676 There are quite a few relaxing opportunities available on the msp430:
678 ================================================================
682 eq == jeq label jne +4; br lab
683 ne != jne label jeq +4; br lab
684 lt < jl label jge +4; br lab
685 ltu < jlo label lhs +4; br lab
686 ge >= jge label jl +4; br lab
687 geu >= jhs label jlo +4; br lab
691 ltn < jn jn +2; jmp +4; br lab
693 3. 4 words -> 2 words
695 gt > jeq +2; jge label jeq +6; jl +4; br label
696 gtu > jeq +2; jhs label jeq +6; jlo +4; br label
698 4. 4 words -> 2 words and 2 labels
700 leu <= jeq label; jlo label jeq +2; jhs +4; br label
701 le <= jeq label; jl label jeq +2; jge +4; br label
702 =================================================================
704 codemap for first cases is (labels masked ):
705 eq: 0x2002,0x4010,0x0000 -> 0x2400
706 ne: 0x2402,0x4010,0x0000 -> 0x2000
707 lt: 0x3402,0x4010,0x0000 -> 0x3800
708 ltu: 0x2c02,0x4010,0x0000 -> 0x2800
709 ge: 0x3802,0x4010,0x0000 -> 0x3400
710 geu: 0x2802,0x4010,0x0000 -> 0x2c00
713 ltn: 0x3001,0x3c02,0x4010,0x0000 -> 0x3000
716 gt: 0x2403,0x3802,0x4010,0x0000 -> 0x2401,0x3400
717 gtu: 0x2403,0x2802,0x4010,0x0000 -> 0x2401,0x2c00
720 leu: 0x2401,0x2c02,0x4010,0x0000 -> 0x2400,0x2800
721 le: 0x2401,0x3402,0x4010,0x0000 -> 0x2400,0x3800
724 jump: 0x4010,0x0000 -> 0x3c00. */
726 #define NUMB_RELAX_CODES 12
727 static struct rcodes_s
729 int f0, f1; /* From code. */
730 int t0, t1; /* To code. */
731 int labels; /* Position of labels: 1 - one label at first
732 word, 2 - one at second word, 3 - two
734 int cdx; /* Words to match. */
735 int bs; /* Shrink bytes. */
736 int off; /* Offset from old label for new code. */
737 int ncl; /* New code length. */
739 {/* lab,cdx,bs,off,ncl */
740 { 0x0000, 0x0000, 0x3c00, 0x0000, 1, 0, 2, 2, 2}, /* jump */
741 { 0x0000, 0x2002, 0x2400, 0x0000, 1, 1, 4, 4, 2}, /* eq */
742 { 0x0000, 0x2402, 0x2000, 0x0000, 1, 1, 4, 4, 2}, /* ne */
743 { 0x0000, 0x3402, 0x3800, 0x0000, 1, 1, 4, 4, 2}, /* lt */
744 { 0x0000, 0x2c02, 0x2800, 0x0000, 1, 1, 4, 4, 2}, /* ltu */
745 { 0x0000, 0x3802, 0x3400, 0x0000, 1, 1, 4, 4, 2}, /* ge */
746 { 0x0000, 0x2802, 0x2c00, 0x0000, 1, 1, 4, 4, 2}, /* geu */
747 { 0x3001, 0x3c02, 0x3000, 0x0000, 1, 2, 6, 6, 2}, /* ltn */
748 { 0x2403, 0x3802, 0x2401, 0x3400, 2, 2, 4, 6, 4}, /* gt */
749 { 0x2403, 0x2802, 0x2401, 0x2c00, 2, 2, 4, 6, 4}, /* gtu */
750 { 0x2401, 0x2c02, 0x2400, 0x2800, 3, 2, 4, 6, 4}, /* leu , 2 labels */
751 { 0x2401, 0x2c02, 0x2400, 0x2800, 3, 2, 4, 6, 4}, /* le , 2 labels */
752 { 0, 0, 0, 0, 0, 0, 0, 0, 0}
755 /* Return TRUE if a symbol exists at the given address. */
758 msp430_elf_symbol_address_p (bfd * abfd,
760 Elf_Internal_Sym * isym,
763 Elf_Internal_Shdr *symtab_hdr;
764 unsigned int sec_shndx;
765 Elf_Internal_Sym *isymend;
766 struct elf_link_hash_entry **sym_hashes;
767 struct elf_link_hash_entry **end_hashes;
768 unsigned int symcount;
770 sec_shndx = _bfd_elf_section_from_bfd_section (abfd, sec);
772 /* Examine all the local symbols. */
773 symtab_hdr = &elf_tdata (abfd)->symtab_hdr;
774 for (isymend = isym + symtab_hdr->sh_info; isym < isymend; isym++)
775 if (isym->st_shndx == sec_shndx && isym->st_value == addr)
778 symcount = (symtab_hdr->sh_size / sizeof (Elf32_External_Sym)
779 - symtab_hdr->sh_info);
780 sym_hashes = elf_sym_hashes (abfd);
781 end_hashes = sym_hashes + symcount;
782 for (; sym_hashes < end_hashes; sym_hashes++)
784 struct elf_link_hash_entry *sym_hash = *sym_hashes;
786 if ((sym_hash->root.type == bfd_link_hash_defined
787 || sym_hash->root.type == bfd_link_hash_defweak)
788 && sym_hash->root.u.def.section == sec
789 && sym_hash->root.u.def.value == addr)
796 /* Adjust all local symbols defined as '.section + 0xXXXX' (.section has sec_shndx)
797 referenced from current and other sections */
799 msp430_elf_relax_adjust_locals(bfd * abfd, asection * sec, bfd_vma addr,
800 int count, unsigned int sec_shndx, bfd_vma toaddr)
802 Elf_Internal_Shdr *symtab_hdr;
803 Elf_Internal_Rela *irel;
804 Elf_Internal_Rela *irelend;
805 Elf_Internal_Sym *isym;
807 irel = elf_section_data (sec)->relocs;
808 irelend = irel + sec->reloc_count;
809 symtab_hdr = & elf_tdata (abfd)->symtab_hdr;
810 isym = (Elf_Internal_Sym *) symtab_hdr->contents;
812 for (irel = elf_section_data (sec)->relocs; irel < irelend; irel++)
814 int sidx = ELF32_R_SYM(irel->r_info);
815 Elf_Internal_Sym *lsym = isym + sidx;
817 /* Adjust symbols referenced by .sec+0xXX */
818 if (irel->r_addend > addr && irel->r_addend < toaddr
819 && lsym->st_shndx == sec_shndx)
820 irel->r_addend -= count;
826 /* Delete some bytes from a section while relaxing. */
829 msp430_elf_relax_delete_bytes (bfd * abfd, asection * sec, bfd_vma addr,
832 Elf_Internal_Shdr *symtab_hdr;
833 unsigned int sec_shndx;
835 Elf_Internal_Rela *irel;
836 Elf_Internal_Rela *irelend;
838 Elf_Internal_Sym *isym;
839 Elf_Internal_Sym *isymend;
840 struct elf_link_hash_entry **sym_hashes;
841 struct elf_link_hash_entry **end_hashes;
842 unsigned int symcount;
845 sec_shndx = _bfd_elf_section_from_bfd_section (abfd, sec);
847 contents = elf_section_data (sec)->this_hdr.contents;
851 irel = elf_section_data (sec)->relocs;
852 irelend = irel + sec->reloc_count;
854 /* Actually delete the bytes. */
855 memmove (contents + addr, contents + addr + count,
856 (size_t) (toaddr - addr - count));
859 /* Adjust all the relocs. */
860 symtab_hdr = & elf_tdata (abfd)->symtab_hdr;
861 isym = (Elf_Internal_Sym *) symtab_hdr->contents;
862 for (irel = elf_section_data (sec)->relocs; irel < irelend; irel++)
864 /* Get the new reloc address. */
865 if ((irel->r_offset > addr && irel->r_offset < toaddr))
866 irel->r_offset -= count;
869 for (p = abfd->sections; p != NULL; p = p->next)
870 msp430_elf_relax_adjust_locals(abfd,p,addr,count,sec_shndx,toaddr);
872 /* Adjust the local symbols defined in this section. */
873 symtab_hdr = & elf_tdata (abfd)->symtab_hdr;
874 isym = (Elf_Internal_Sym *) symtab_hdr->contents;
875 for (isymend = isym + symtab_hdr->sh_info; isym < isymend; isym++)
876 if (isym->st_shndx == sec_shndx
877 && isym->st_value > addr && isym->st_value < toaddr)
878 isym->st_value -= count;
880 /* Now adjust the global symbols defined in this section. */
881 symcount = (symtab_hdr->sh_size / sizeof (Elf32_External_Sym)
882 - symtab_hdr->sh_info);
883 sym_hashes = elf_sym_hashes (abfd);
884 end_hashes = sym_hashes + symcount;
885 for (; sym_hashes < end_hashes; sym_hashes++)
887 struct elf_link_hash_entry *sym_hash = *sym_hashes;
889 if ((sym_hash->root.type == bfd_link_hash_defined
890 || sym_hash->root.type == bfd_link_hash_defweak)
891 && sym_hash->root.u.def.section == sec
892 && sym_hash->root.u.def.value > addr
893 && sym_hash->root.u.def.value < toaddr)
894 sym_hash->root.u.def.value -= count;
902 msp430_elf_relax_section (bfd * abfd, asection * sec,
903 struct bfd_link_info * link_info,
906 Elf_Internal_Shdr * symtab_hdr;
907 Elf_Internal_Rela * internal_relocs;
908 Elf_Internal_Rela * irel;
909 Elf_Internal_Rela * irelend;
910 bfd_byte * contents = NULL;
911 Elf_Internal_Sym * isymbuf = NULL;
913 /* Assume nothing changes. */
916 /* We don't have to do anything for a relocatable link, if
917 this section does not have relocs, or if this is not a
919 if (link_info->relocatable
920 || (sec->flags & SEC_RELOC) == 0
921 || sec->reloc_count == 0 || (sec->flags & SEC_CODE) == 0)
924 symtab_hdr = & elf_tdata (abfd)->symtab_hdr;
926 /* Get a copy of the native relocations. */
928 _bfd_elf_link_read_relocs (abfd, sec, NULL, NULL, link_info->keep_memory);
929 if (internal_relocs == NULL)
932 /* Walk through them looking for relaxing opportunities. */
933 irelend = internal_relocs + sec->reloc_count;
934 for (irel = internal_relocs; irel < irelend; irel++)
938 /* If this isn't something that can be relaxed, then ignore
940 if (ELF32_R_TYPE (irel->r_info) != (int) R_MSP430_RL_PCREL)
943 /* Get the section contents if we haven't done so already. */
944 if (contents == NULL)
946 /* Get cached copy if it exists. */
947 if (elf_section_data (sec)->this_hdr.contents != NULL)
948 contents = elf_section_data (sec)->this_hdr.contents;
949 else if (! bfd_malloc_and_get_section (abfd, sec, &contents))
953 /* Read this BFD's local symbols if we haven't done so already. */
954 if (isymbuf == NULL && symtab_hdr->sh_info != 0)
956 isymbuf = (Elf_Internal_Sym *) symtab_hdr->contents;
958 isymbuf = bfd_elf_get_elf_syms (abfd, symtab_hdr,
959 symtab_hdr->sh_info, 0,
965 /* Get the value of the symbol referred to by the reloc. */
966 if (ELF32_R_SYM (irel->r_info) < symtab_hdr->sh_info)
968 /* A local symbol. */
969 Elf_Internal_Sym *isym;
972 isym = isymbuf + ELF32_R_SYM (irel->r_info);
973 if (isym->st_shndx == SHN_UNDEF)
974 sym_sec = bfd_und_section_ptr;
975 else if (isym->st_shndx == SHN_ABS)
976 sym_sec = bfd_abs_section_ptr;
977 else if (isym->st_shndx == SHN_COMMON)
978 sym_sec = bfd_com_section_ptr;
980 sym_sec = bfd_section_from_elf_index (abfd, isym->st_shndx);
981 symval = (isym->st_value
982 + sym_sec->output_section->vma + sym_sec->output_offset);
987 struct elf_link_hash_entry *h;
989 /* An external symbol. */
990 indx = ELF32_R_SYM (irel->r_info) - symtab_hdr->sh_info;
991 h = elf_sym_hashes (abfd)[indx];
992 BFD_ASSERT (h != NULL);
994 if (h->root.type != bfd_link_hash_defined
995 && h->root.type != bfd_link_hash_defweak)
996 /* This appears to be a reference to an undefined
997 symbol. Just ignore it--it will be caught by the
998 regular reloc processing. */
1001 symval = (h->root.u.def.value
1002 + h->root.u.def.section->output_section->vma
1003 + h->root.u.def.section->output_offset);
1006 /* For simplicity of coding, we are going to modify the section
1007 contents, the section relocs, and the BFD symbol table. We
1008 must tell the rest of the code not to free up this
1009 information. It would be possible to instead create a table
1010 of changes which have to be made, as is done in coff-mips.c;
1011 that would be more work, but would require less memory when
1012 the linker is run. */
1014 /* Try to turn a 16bit pc-relative branch into a 10bit pc-relative
1016 /* Paranoia? paranoia... */
1017 if (ELF32_R_TYPE (irel->r_info) == (int) R_MSP430_RL_PCREL)
1019 bfd_vma value = symval;
1021 /* Deal with pc-relative gunk. */
1022 value -= (sec->output_section->vma + sec->output_offset);
1023 value -= irel->r_offset;
1024 value += irel->r_addend;
1026 /* See if the value will fit in 10 bits, note the high value is
1027 1016 as the target will be two bytes closer if we are
1029 if ((long) value < 1016 && (long) value > -1016)
1031 int code0 = 0, code1 = 0, code2 = 0;
1033 struct rcodes_s *rx;
1035 /* Get the opcode. */
1036 if (irel->r_offset >= 6)
1037 code0 = bfd_get_16 (abfd, contents + irel->r_offset - 6);
1039 if (irel->r_offset >= 4)
1040 code1 = bfd_get_16 (abfd, contents + irel->r_offset - 4);
1042 code2 = bfd_get_16 (abfd, contents + irel->r_offset - 2);
1044 if (code2 != 0x4010)
1047 /* Check r4 and r3. */
1048 for (i = NUMB_RELAX_CODES - 1; i >= 0; i--)
1051 if (rx->cdx == 2 && rx->f0 == code0 && rx->f1 == code1)
1053 else if (rx->cdx == 1 && rx->f1 == code1)
1055 else if (rx->cdx == 0) /* This is an unconditional jump. */
1060 .Label0: ; we do not care about this label
1062 .Label1: ; make sure there is no label here
1064 .Label2: ; make sure there is no label here
1067 So, if there is .Label1 or .Label2 we cannot relax this code.
1068 This actually should not happen, cause for relaxable
1069 instructions we use RL_PCREL reloc instead of 16_PCREL.
1070 Will change this in the future. */
1073 && msp430_elf_symbol_address_p (abfd, sec, isymbuf,
1074 irel->r_offset - 2))
1077 && msp430_elf_symbol_address_p (abfd, sec, isymbuf,
1078 irel->r_offset - 4))
1081 /* Note that we've changed the relocs, section contents, etc. */
1082 elf_section_data (sec)->relocs = internal_relocs;
1083 elf_section_data (sec)->this_hdr.contents = contents;
1084 symtab_hdr->contents = (unsigned char *) isymbuf;
1086 /* Fix the relocation's type. */
1087 if (rx->labels == 3) /* Handle special cases. */
1088 irel->r_info = ELF32_R_INFO (ELF32_R_SYM (irel->r_info),
1091 irel->r_info = ELF32_R_INFO (ELF32_R_SYM (irel->r_info),
1094 /* Fix the opcode right way. */
1095 bfd_put_16 (abfd, rx->t0, contents + irel->r_offset - rx->off);
1097 bfd_put_16 (abfd, rx->t1,
1098 contents + irel->r_offset - rx->off + 2);
1101 if (!msp430_elf_relax_delete_bytes (abfd, sec,
1102 irel->r_offset - rx->off +
1106 /* Handle unconditional jumps. */
1108 irel->r_offset -= 2;
1110 /* That will change things, so, we should relax again.
1111 Note that this is not required, and it may be slow. */
1117 if (isymbuf != NULL && symtab_hdr->contents != (unsigned char *) isymbuf)
1119 if (!link_info->keep_memory)
1123 /* Cache the symbols for elf_link_input_bfd. */
1124 symtab_hdr->contents = (unsigned char *) isymbuf;
1128 if (contents != NULL
1129 && elf_section_data (sec)->this_hdr.contents != contents)
1131 if (!link_info->keep_memory)
1135 /* Cache the section contents for elf_link_input_bfd. */
1136 elf_section_data (sec)->this_hdr.contents = contents;
1140 if (internal_relocs != NULL
1141 && elf_section_data (sec)->relocs != internal_relocs)
1142 free (internal_relocs);
1147 if (isymbuf != NULL && symtab_hdr->contents != (unsigned char *) isymbuf)
1149 if (contents != NULL
1150 && elf_section_data (sec)->this_hdr.contents != contents)
1152 if (internal_relocs != NULL
1153 && elf_section_data (sec)->relocs != internal_relocs)
1154 free (internal_relocs);
1160 #define ELF_ARCH bfd_arch_msp430
1161 #define ELF_MACHINE_CODE EM_MSP430
1162 #define ELF_MACHINE_ALT1 EM_MSP430_OLD
1163 #define ELF_MAXPAGESIZE 1
1164 #define ELF_OSABI ELFOSABI_STANDALONE
1166 #define TARGET_LITTLE_SYM bfd_elf32_msp430_vec
1167 #define TARGET_LITTLE_NAME "elf32-msp430"
1169 #define elf_info_to_howto msp430_info_to_howto_rela
1170 #define elf_info_to_howto_rel NULL
1171 #define elf_backend_relocate_section elf32_msp430_relocate_section
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 _bfd_elf_set_osabi
1177 #define bfd_elf32_bfd_relax_section msp430_elf_relax_section
1179 #include "elf32-target.h"