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 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 + ELF32_R_TYPE (rel->r_info);
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 && elf_discarded_section (sec))
459 /* For relocs against symbols from removed linkonce sections,
460 or sections discarded by a linker script, we just want the
461 section contents zeroed. Avoid any special processing. */
462 _bfd_clear_contents (howto, input_bfd, contents + rel->r_offset);
468 if (info->relocatable)
471 r = msp430_final_link_relocate (howto, input_bfd, input_section,
472 contents, rel, relocation);
474 if (r != bfd_reloc_ok)
476 const char *msg = (const char *) NULL;
480 case bfd_reloc_overflow:
481 r = info->callbacks->reloc_overflow
482 (info, (h ? &h->root : NULL), name, howto->name,
483 (bfd_vma) 0, input_bfd, input_section,
487 case bfd_reloc_undefined:
488 r = info->callbacks->undefined_symbol
489 (info, name, input_bfd, input_section, rel->r_offset, TRUE);
492 case bfd_reloc_outofrange:
493 msg = _("internal error: out of range error");
496 case bfd_reloc_notsupported:
497 msg = _("internal error: unsupported relocation error");
500 case bfd_reloc_dangerous:
501 msg = _("internal error: dangerous relocation");
505 msg = _("internal error: unknown error");
510 r = info->callbacks->warning
511 (info, msg, name, input_bfd, input_section, rel->r_offset);
522 /* The final processing done just before writing out a MSP430 ELF object
523 file. This gets the MSP430 architecture right based on the machine
527 bfd_elf_msp430_final_write_processing (bfd * abfd,
528 bfd_boolean linker ATTRIBUTE_UNUSED)
532 switch (bfd_get_mach (abfd))
535 case bfd_mach_msp110:
536 val = E_MSP430_MACH_MSP430x11x1;
540 val = E_MSP430_MACH_MSP430x11;
544 val = E_MSP430_MACH_MSP430x12;
548 val = E_MSP430_MACH_MSP430x13;
552 val = E_MSP430_MACH_MSP430x14;
556 val = E_MSP430_MACH_MSP430x15;
560 val = E_MSP430_MACH_MSP430x16;
564 val = E_MSP430_MACH_MSP430x31;
568 val = E_MSP430_MACH_MSP430x32;
572 val = E_MSP430_MACH_MSP430x33;
576 val = E_MSP430_MACH_MSP430x41;
580 val = E_MSP430_MACH_MSP430x42;
584 val = E_MSP430_MACH_MSP430x43;
588 val = E_MSP430_MACH_MSP430x44;
592 elf_elfheader (abfd)->e_machine = EM_MSP430;
593 elf_elfheader (abfd)->e_flags &= ~EF_MSP430_MACH;
594 elf_elfheader (abfd)->e_flags |= val;
597 /* Set the right machine number. */
600 elf32_msp430_object_p (bfd * abfd)
602 int e_set = bfd_mach_msp14;
604 if (elf_elfheader (abfd)->e_machine == EM_MSP430
605 || elf_elfheader (abfd)->e_machine == EM_MSP430_OLD)
607 int e_mach = elf_elfheader (abfd)->e_flags & EF_MSP430_MACH;
612 case E_MSP430_MACH_MSP430x11:
613 e_set = bfd_mach_msp11;
616 case E_MSP430_MACH_MSP430x11x1:
617 e_set = bfd_mach_msp110;
620 case E_MSP430_MACH_MSP430x12:
621 e_set = bfd_mach_msp12;
624 case E_MSP430_MACH_MSP430x13:
625 e_set = bfd_mach_msp13;
628 case E_MSP430_MACH_MSP430x14:
629 e_set = bfd_mach_msp14;
632 case E_MSP430_MACH_MSP430x15:
633 e_set = bfd_mach_msp15;
636 case E_MSP430_MACH_MSP430x16:
637 e_set = bfd_mach_msp16;
640 case E_MSP430_MACH_MSP430x31:
641 e_set = bfd_mach_msp31;
644 case E_MSP430_MACH_MSP430x32:
645 e_set = bfd_mach_msp32;
648 case E_MSP430_MACH_MSP430x33:
649 e_set = bfd_mach_msp33;
652 case E_MSP430_MACH_MSP430x41:
653 e_set = bfd_mach_msp41;
656 case E_MSP430_MACH_MSP430x42:
657 e_set = bfd_mach_msp42;
660 case E_MSP430_MACH_MSP430x43:
661 e_set = bfd_mach_msp43;
664 case E_MSP430_MACH_MSP430x44:
665 e_set = bfd_mach_msp44;
670 return bfd_default_set_arch_mach (abfd, bfd_arch_msp430, e_set);
673 /* These functions handle relaxing for the msp430.
674 Relaxation required only in two cases:
675 - Bad hand coding like jumps from one section to another or
677 - Sibling calls. This will affect onlu 'jump label' polymorph. Without
678 relaxing this enlarges code by 2 bytes. Sibcalls implemented but
679 do not work in gcc's port by the reason I do not know.
680 Anyway, if a relaxation required, user should pass -relax option to the
683 There are quite a few relaxing opportunities available on the msp430:
685 ================================================================
689 eq == jeq label jne +4; br lab
690 ne != jne label jeq +4; br lab
691 lt < jl label jge +4; br lab
692 ltu < jlo label lhs +4; br lab
693 ge >= jge label jl +4; br lab
694 geu >= jhs label jlo +4; br lab
698 ltn < jn jn +2; jmp +4; br lab
700 3. 4 words -> 2 words
702 gt > jeq +2; jge label jeq +6; jl +4; br label
703 gtu > jeq +2; jhs label jeq +6; jlo +4; br label
705 4. 4 words -> 2 words and 2 labels
707 leu <= jeq label; jlo label jeq +2; jhs +4; br label
708 le <= jeq label; jl label jeq +2; jge +4; br label
709 =================================================================
711 codemap for first cases is (labels masked ):
712 eq: 0x2002,0x4010,0x0000 -> 0x2400
713 ne: 0x2402,0x4010,0x0000 -> 0x2000
714 lt: 0x3402,0x4010,0x0000 -> 0x3800
715 ltu: 0x2c02,0x4010,0x0000 -> 0x2800
716 ge: 0x3802,0x4010,0x0000 -> 0x3400
717 geu: 0x2802,0x4010,0x0000 -> 0x2c00
720 ltn: 0x3001,0x3c02,0x4010,0x0000 -> 0x3000
723 gt: 0x2403,0x3802,0x4010,0x0000 -> 0x2401,0x3400
724 gtu: 0x2403,0x2802,0x4010,0x0000 -> 0x2401,0x2c00
727 leu: 0x2401,0x2c02,0x4010,0x0000 -> 0x2400,0x2800
728 le: 0x2401,0x3402,0x4010,0x0000 -> 0x2400,0x3800
731 jump: 0x4010,0x0000 -> 0x3c00. */
733 #define NUMB_RELAX_CODES 12
734 static struct rcodes_s
736 int f0, f1; /* From code. */
737 int t0, t1; /* To code. */
738 int labels; /* Position of labels: 1 - one label at first
739 word, 2 - one at second word, 3 - two
741 int cdx; /* Words to match. */
742 int bs; /* Shrink bytes. */
743 int off; /* Offset from old label for new code. */
744 int ncl; /* New code length. */
746 {/* lab,cdx,bs,off,ncl */
747 { 0x0000, 0x0000, 0x3c00, 0x0000, 1, 0, 2, 2, 2}, /* jump */
748 { 0x0000, 0x2002, 0x2400, 0x0000, 1, 1, 4, 4, 2}, /* eq */
749 { 0x0000, 0x2402, 0x2000, 0x0000, 1, 1, 4, 4, 2}, /* ne */
750 { 0x0000, 0x3402, 0x3800, 0x0000, 1, 1, 4, 4, 2}, /* lt */
751 { 0x0000, 0x2c02, 0x2800, 0x0000, 1, 1, 4, 4, 2}, /* ltu */
752 { 0x0000, 0x3802, 0x3400, 0x0000, 1, 1, 4, 4, 2}, /* ge */
753 { 0x0000, 0x2802, 0x2c00, 0x0000, 1, 1, 4, 4, 2}, /* geu */
754 { 0x3001, 0x3c02, 0x3000, 0x0000, 1, 2, 6, 6, 2}, /* ltn */
755 { 0x2403, 0x3802, 0x2401, 0x3400, 2, 2, 4, 6, 4}, /* gt */
756 { 0x2403, 0x2802, 0x2401, 0x2c00, 2, 2, 4, 6, 4}, /* gtu */
757 { 0x2401, 0x2c02, 0x2400, 0x2800, 3, 2, 4, 6, 4}, /* leu , 2 labels */
758 { 0x2401, 0x2c02, 0x2400, 0x2800, 3, 2, 4, 6, 4}, /* le , 2 labels */
759 { 0, 0, 0, 0, 0, 0, 0, 0, 0}
762 /* Return TRUE if a symbol exists at the given address. */
765 msp430_elf_symbol_address_p (bfd * abfd,
767 Elf_Internal_Sym * isym,
770 Elf_Internal_Shdr *symtab_hdr;
771 unsigned int sec_shndx;
772 Elf_Internal_Sym *isymend;
773 struct elf_link_hash_entry **sym_hashes;
774 struct elf_link_hash_entry **end_hashes;
775 unsigned int symcount;
777 sec_shndx = _bfd_elf_section_from_bfd_section (abfd, sec);
779 /* Examine all the local symbols. */
780 symtab_hdr = &elf_tdata (abfd)->symtab_hdr;
781 for (isymend = isym + symtab_hdr->sh_info; isym < isymend; isym++)
782 if (isym->st_shndx == sec_shndx && isym->st_value == addr)
785 symcount = (symtab_hdr->sh_size / sizeof (Elf32_External_Sym)
786 - symtab_hdr->sh_info);
787 sym_hashes = elf_sym_hashes (abfd);
788 end_hashes = sym_hashes + symcount;
789 for (; sym_hashes < end_hashes; sym_hashes++)
791 struct elf_link_hash_entry *sym_hash = *sym_hashes;
793 if ((sym_hash->root.type == bfd_link_hash_defined
794 || sym_hash->root.type == bfd_link_hash_defweak)
795 && sym_hash->root.u.def.section == sec
796 && sym_hash->root.u.def.value == addr)
803 /* Adjust all local symbols defined as '.section + 0xXXXX' (.section has sec_shndx)
804 referenced from current and other sections */
806 msp430_elf_relax_adjust_locals(bfd * abfd, asection * sec, bfd_vma addr,
807 int count, unsigned int sec_shndx, bfd_vma toaddr)
809 Elf_Internal_Shdr *symtab_hdr;
810 Elf_Internal_Rela *irel;
811 Elf_Internal_Rela *irelend;
812 Elf_Internal_Sym *isym;
814 irel = elf_section_data (sec)->relocs;
815 irelend = irel + sec->reloc_count;
816 symtab_hdr = & elf_tdata (abfd)->symtab_hdr;
817 isym = (Elf_Internal_Sym *) symtab_hdr->contents;
819 for (irel = elf_section_data (sec)->relocs; irel < irelend; irel++)
821 int sidx = ELF32_R_SYM(irel->r_info);
822 Elf_Internal_Sym *lsym = isym + sidx;
824 /* Adjust symbols referenced by .sec+0xXX */
825 if (irel->r_addend > addr && irel->r_addend < toaddr
826 && lsym->st_shndx == sec_shndx)
827 irel->r_addend -= count;
833 /* Delete some bytes from a section while relaxing. */
836 msp430_elf_relax_delete_bytes (bfd * abfd, asection * sec, bfd_vma addr,
839 Elf_Internal_Shdr *symtab_hdr;
840 unsigned int sec_shndx;
842 Elf_Internal_Rela *irel;
843 Elf_Internal_Rela *irelend;
844 Elf_Internal_Rela *irelalign;
846 Elf_Internal_Sym *isym;
847 Elf_Internal_Sym *isymend;
848 struct elf_link_hash_entry **sym_hashes;
849 struct elf_link_hash_entry **end_hashes;
850 unsigned int symcount;
853 sec_shndx = _bfd_elf_section_from_bfd_section (abfd, sec);
855 contents = elf_section_data (sec)->this_hdr.contents;
857 /* The deletion must stop at the next ALIGN reloc for an aligment
858 power larger than the number of bytes we are deleting. */
863 irel = elf_section_data (sec)->relocs;
864 irelend = irel + sec->reloc_count;
866 /* Actually delete the bytes. */
867 memmove (contents + addr, contents + addr + count,
868 (size_t) (toaddr - addr - count));
871 /* Adjust all the relocs. */
872 symtab_hdr = & elf_tdata (abfd)->symtab_hdr;
873 isym = (Elf_Internal_Sym *) symtab_hdr->contents;
874 for (irel = elf_section_data (sec)->relocs; irel < irelend; irel++)
876 /* Get the new reloc address. */
877 if ((irel->r_offset > addr && irel->r_offset < toaddr))
878 irel->r_offset -= count;
881 for (p = abfd->sections; p != NULL; p = p->next)
882 msp430_elf_relax_adjust_locals(abfd,p,addr,count,sec_shndx,toaddr);
884 /* Adjust the local symbols defined in this section. */
885 symtab_hdr = & elf_tdata (abfd)->symtab_hdr;
886 isym = (Elf_Internal_Sym *) symtab_hdr->contents;
887 for (isymend = isym + symtab_hdr->sh_info; isym < isymend; isym++)
888 if (isym->st_shndx == sec_shndx
889 && isym->st_value > addr && isym->st_value < toaddr)
890 isym->st_value -= count;
892 /* Now adjust the global symbols defined in this section. */
893 symcount = (symtab_hdr->sh_size / sizeof (Elf32_External_Sym)
894 - symtab_hdr->sh_info);
895 sym_hashes = elf_sym_hashes (abfd);
896 end_hashes = sym_hashes + symcount;
897 for (; sym_hashes < end_hashes; sym_hashes++)
899 struct elf_link_hash_entry *sym_hash = *sym_hashes;
901 if ((sym_hash->root.type == bfd_link_hash_defined
902 || sym_hash->root.type == bfd_link_hash_defweak)
903 && sym_hash->root.u.def.section == sec
904 && sym_hash->root.u.def.value > addr
905 && sym_hash->root.u.def.value < toaddr)
906 sym_hash->root.u.def.value -= count;
914 msp430_elf_relax_section (bfd * abfd, asection * sec,
915 struct bfd_link_info * link_info,
918 Elf_Internal_Shdr * symtab_hdr;
919 Elf_Internal_Rela * internal_relocs;
920 Elf_Internal_Rela * irel;
921 Elf_Internal_Rela * irelend;
922 bfd_byte * contents = NULL;
923 Elf_Internal_Sym * isymbuf = NULL;
925 /* Assume nothing changes. */
928 /* We don't have to do anything for a relocatable link, if
929 this section does not have relocs, or if this is not a
931 if (link_info->relocatable
932 || (sec->flags & SEC_RELOC) == 0
933 || sec->reloc_count == 0 || (sec->flags & SEC_CODE) == 0)
936 symtab_hdr = & elf_tdata (abfd)->symtab_hdr;
938 /* Get a copy of the native relocations. */
940 _bfd_elf_link_read_relocs (abfd, sec, NULL, NULL, link_info->keep_memory);
941 if (internal_relocs == NULL)
944 /* Walk through them looking for relaxing opportunities. */
945 irelend = internal_relocs + sec->reloc_count;
946 for (irel = internal_relocs; irel < irelend; irel++)
950 /* If this isn't something that can be relaxed, then ignore
952 if (ELF32_R_TYPE (irel->r_info) != (int) R_MSP430_RL_PCREL)
955 /* Get the section contents if we haven't done so already. */
956 if (contents == NULL)
958 /* Get cached copy if it exists. */
959 if (elf_section_data (sec)->this_hdr.contents != NULL)
960 contents = elf_section_data (sec)->this_hdr.contents;
961 else if (! bfd_malloc_and_get_section (abfd, sec, &contents))
965 /* Read this BFD's local symbols if we haven't done so already. */
966 if (isymbuf == NULL && symtab_hdr->sh_info != 0)
968 isymbuf = (Elf_Internal_Sym *) symtab_hdr->contents;
970 isymbuf = bfd_elf_get_elf_syms (abfd, symtab_hdr,
971 symtab_hdr->sh_info, 0,
977 /* Get the value of the symbol referred to by the reloc. */
978 if (ELF32_R_SYM (irel->r_info) < symtab_hdr->sh_info)
980 /* A local symbol. */
981 Elf_Internal_Sym *isym;
984 isym = isymbuf + ELF32_R_SYM (irel->r_info);
985 if (isym->st_shndx == SHN_UNDEF)
986 sym_sec = bfd_und_section_ptr;
987 else if (isym->st_shndx == SHN_ABS)
988 sym_sec = bfd_abs_section_ptr;
989 else if (isym->st_shndx == SHN_COMMON)
990 sym_sec = bfd_com_section_ptr;
992 sym_sec = bfd_section_from_elf_index (abfd, isym->st_shndx);
993 symval = (isym->st_value
994 + sym_sec->output_section->vma + sym_sec->output_offset);
999 struct elf_link_hash_entry *h;
1001 /* An external symbol. */
1002 indx = ELF32_R_SYM (irel->r_info) - symtab_hdr->sh_info;
1003 h = elf_sym_hashes (abfd)[indx];
1004 BFD_ASSERT (h != NULL);
1006 if (h->root.type != bfd_link_hash_defined
1007 && h->root.type != bfd_link_hash_defweak)
1008 /* This appears to be a reference to an undefined
1009 symbol. Just ignore it--it will be caught by the
1010 regular reloc processing. */
1013 symval = (h->root.u.def.value
1014 + h->root.u.def.section->output_section->vma
1015 + h->root.u.def.section->output_offset);
1018 /* For simplicity of coding, we are going to modify the section
1019 contents, the section relocs, and the BFD symbol table. We
1020 must tell the rest of the code not to free up this
1021 information. It would be possible to instead create a table
1022 of changes which have to be made, as is done in coff-mips.c;
1023 that would be more work, but would require less memory when
1024 the linker is run. */
1026 /* Try to turn a 16bit pc-relative branch into a 10bit pc-relative
1028 /* Paranoia? paranoia... */
1029 if (ELF32_R_TYPE (irel->r_info) == (int) R_MSP430_RL_PCREL)
1031 bfd_vma value = symval;
1033 /* Deal with pc-relative gunk. */
1034 value -= (sec->output_section->vma + sec->output_offset);
1035 value -= irel->r_offset;
1036 value += irel->r_addend;
1038 /* See if the value will fit in 10 bits, note the high value is
1039 1016 as the target will be two bytes closer if we are
1041 if ((long) value < 1016 && (long) value > -1016)
1043 int code0 = 0, code1 = 0, code2 = 0;
1045 struct rcodes_s *rx;
1047 /* Get the opcode. */
1048 if (irel->r_offset >= 6)
1049 code0 = bfd_get_16 (abfd, contents + irel->r_offset - 6);
1051 if (irel->r_offset >= 4)
1052 code1 = bfd_get_16 (abfd, contents + irel->r_offset - 4);
1054 code2 = bfd_get_16 (abfd, contents + irel->r_offset - 2);
1056 if (code2 != 0x4010)
1059 /* Check r4 and r3. */
1060 for (i = NUMB_RELAX_CODES - 1; i >= 0; i--)
1063 if (rx->cdx == 2 && rx->f0 == code0 && rx->f1 == code1)
1065 else if (rx->cdx == 1 && rx->f1 == code1)
1067 else if (rx->cdx == 0) /* This is an unconditional jump. */
1072 .Label0: ; we do not care about this label
1074 .Label1: ; make sure there is no label here
1076 .Label2: ; make sure there is no label here
1079 So, if there is .Label1 or .Label2 we cannot relax this code.
1080 This actually should not happen, cause for relaxable
1081 instructions we use RL_PCREL reloc instead of 16_PCREL.
1082 Will change this in the future. */
1085 && msp430_elf_symbol_address_p (abfd, sec, isymbuf,
1086 irel->r_offset - 2))
1089 && msp430_elf_symbol_address_p (abfd, sec, isymbuf,
1090 irel->r_offset - 4))
1093 /* Note that we've changed the relocs, section contents, etc. */
1094 elf_section_data (sec)->relocs = internal_relocs;
1095 elf_section_data (sec)->this_hdr.contents = contents;
1096 symtab_hdr->contents = (unsigned char *) isymbuf;
1098 /* Fix the relocation's type. */
1099 if (rx->labels == 3) /* Handle special cases. */
1100 irel->r_info = ELF32_R_INFO (ELF32_R_SYM (irel->r_info),
1103 irel->r_info = ELF32_R_INFO (ELF32_R_SYM (irel->r_info),
1106 /* Fix the opcode right way. */
1107 bfd_put_16 (abfd, rx->t0, contents + irel->r_offset - rx->off);
1109 bfd_put_16 (abfd, rx->t1,
1110 contents + irel->r_offset - rx->off + 2);
1113 if (!msp430_elf_relax_delete_bytes (abfd, sec,
1114 irel->r_offset - rx->off +
1118 /* Handle unconditional jumps. */
1120 irel->r_offset -= 2;
1122 /* That will change things, so, we should relax again.
1123 Note that this is not required, and it may be slow. */
1129 if (isymbuf != NULL && symtab_hdr->contents != (unsigned char *) isymbuf)
1131 if (!link_info->keep_memory)
1135 /* Cache the symbols for elf_link_input_bfd. */
1136 symtab_hdr->contents = (unsigned char *) isymbuf;
1140 if (contents != NULL
1141 && elf_section_data (sec)->this_hdr.contents != contents)
1143 if (!link_info->keep_memory)
1147 /* Cache the section contents for elf_link_input_bfd. */
1148 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);
1159 if (isymbuf != NULL && symtab_hdr->contents != (unsigned char *) isymbuf)
1161 if (contents != NULL
1162 && elf_section_data (sec)->this_hdr.contents != contents)
1164 if (internal_relocs != NULL
1165 && elf_section_data (sec)->relocs != internal_relocs)
1166 free (internal_relocs);
1172 #define ELF_ARCH bfd_arch_msp430
1173 #define ELF_MACHINE_CODE EM_MSP430
1174 #define ELF_MACHINE_ALT1 EM_MSP430_OLD
1175 #define ELF_MAXPAGESIZE 1
1176 #define ELF_OSABI ELFOSABI_STANDALONE
1178 #define TARGET_LITTLE_SYM bfd_elf32_msp430_vec
1179 #define TARGET_LITTLE_NAME "elf32-msp430"
1181 #define elf_info_to_howto msp430_info_to_howto_rela
1182 #define elf_info_to_howto_rel NULL
1183 #define elf_backend_relocate_section elf32_msp430_relocate_section
1184 #define elf_backend_check_relocs elf32_msp430_check_relocs
1185 #define elf_backend_can_gc_sections 1
1186 #define elf_backend_final_write_processing bfd_elf_msp430_final_write_processing
1187 #define elf_backend_object_p elf32_msp430_object_p
1188 #define elf_backend_post_process_headers _bfd_elf_set_osabi
1189 #define bfd_elf32_bfd_relax_section msp430_elf_relax_section
1191 #include "elf32-target.h"