1 /* Renesas RL78 specific support for 32-bit ELF.
2 Copyright (C) 2011, 2012
3 Free Software Foundation, Inc.
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 3 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 "bfd_stdint.h"
27 #include "libiberty.h"
29 #define valid_16bit_address(v) ((v) <= 0x0ffff || (v) >= 0xf0000)
31 #define RL78REL(n,sz,bit,shift,complain,pcrel) \
32 HOWTO (R_RL78_##n, shift, sz, bit, pcrel, 0, complain_overflow_ ## complain, \
33 bfd_elf_generic_reloc, "R_RL78_" #n, FALSE, 0, ~0, FALSE)
35 /* Note that the relocations around 0x7f are internal to this file;
36 feel free to move them as needed to avoid conflicts with published
37 relocation numbers. */
39 static reloc_howto_type rl78_elf_howto_table [] =
41 RL78REL (NONE, 0, 0, 0, dont, FALSE),
42 RL78REL (DIR32, 2, 32, 0, signed, FALSE),
43 RL78REL (DIR24S, 2, 24, 0, signed, FALSE),
44 RL78REL (DIR16, 1, 16, 0, dont, FALSE),
45 RL78REL (DIR16U, 1, 16, 0, unsigned, FALSE),
46 RL78REL (DIR16S, 1, 16, 0, signed, FALSE),
47 RL78REL (DIR8, 0, 8, 0, dont, FALSE),
48 RL78REL (DIR8U, 0, 8, 0, unsigned, FALSE),
49 RL78REL (DIR8S, 0, 8, 0, signed, FALSE),
50 RL78REL (DIR24S_PCREL, 2, 24, 0, signed, TRUE),
51 RL78REL (DIR16S_PCREL, 1, 16, 0, signed, TRUE),
52 RL78REL (DIR8S_PCREL, 0, 8, 0, signed, TRUE),
53 RL78REL (DIR16UL, 1, 16, 2, unsigned, FALSE),
54 RL78REL (DIR16UW, 1, 16, 1, unsigned, FALSE),
55 RL78REL (DIR8UL, 0, 8, 2, unsigned, FALSE),
56 RL78REL (DIR8UW, 0, 8, 1, unsigned, FALSE),
57 RL78REL (DIR32_REV, 1, 16, 0, dont, FALSE),
58 RL78REL (DIR16_REV, 1, 16, 0, dont, FALSE),
59 RL78REL (DIR3U_PCREL, 0, 3, 0, dont, TRUE),
88 RL78REL (RH_RELAX, 0, 0, 0, dont, FALSE),
110 RL78REL (ABS32, 2, 32, 0, dont, FALSE),
111 RL78REL (ABS24S, 2, 24, 0, signed, FALSE),
112 RL78REL (ABS16, 1, 16, 0, dont, FALSE),
113 RL78REL (ABS16U, 1, 16, 0, unsigned, FALSE),
114 RL78REL (ABS16S, 1, 16, 0, signed, FALSE),
115 RL78REL (ABS8, 0, 8, 0, dont, FALSE),
116 RL78REL (ABS8U, 0, 8, 0, unsigned, FALSE),
117 RL78REL (ABS8S, 0, 8, 0, signed, FALSE),
118 RL78REL (ABS24S_PCREL, 2, 24, 0, signed, TRUE),
119 RL78REL (ABS16S_PCREL, 1, 16, 0, signed, TRUE),
120 RL78REL (ABS8S_PCREL, 0, 8, 0, signed, TRUE),
121 RL78REL (ABS16UL, 1, 16, 0, unsigned, FALSE),
122 RL78REL (ABS16UW, 1, 16, 0, unsigned, FALSE),
123 RL78REL (ABS8UL, 0, 8, 0, unsigned, FALSE),
124 RL78REL (ABS8UW, 0, 8, 0, unsigned, FALSE),
125 RL78REL (ABS32_REV, 2, 32, 0, dont, FALSE),
126 RL78REL (ABS16_REV, 1, 16, 0, dont, FALSE),
128 #define STACK_REL_P(x) ((x) <= R_RL78_ABS16_REV && (x) >= R_RL78_ABS32)
178 RL78REL (SYM, 2, 32, 0, dont, FALSE),
179 RL78REL (OPneg, 2, 32, 0, dont, FALSE),
180 RL78REL (OPadd, 2, 32, 0, dont, FALSE),
181 RL78REL (OPsub, 2, 32, 0, dont, FALSE),
182 RL78REL (OPmul, 2, 32, 0, dont, FALSE),
183 RL78REL (OPdiv, 2, 32, 0, dont, FALSE),
184 RL78REL (OPshla, 2, 32, 0, dont, FALSE),
185 RL78REL (OPshra, 2, 32, 0, dont, FALSE),
186 RL78REL (OPsctsize, 2, 32, 0, dont, FALSE),
191 RL78REL (OPscttop, 2, 32, 0, dont, FALSE),
194 RL78REL (OPand, 2, 32, 0, dont, FALSE),
195 RL78REL (OPor, 2, 32, 0, dont, FALSE),
196 RL78REL (OPxor, 2, 32, 0, dont, FALSE),
197 RL78REL (OPnot, 2, 32, 0, dont, FALSE),
198 RL78REL (OPmod, 2, 32, 0, dont, FALSE),
199 RL78REL (OPromtop, 2, 32, 0, dont, FALSE),
200 RL78REL (OPramtop, 2, 32, 0, dont, FALSE)
203 /* Map BFD reloc types to RL78 ELF reloc types. */
205 struct rl78_reloc_map
207 bfd_reloc_code_real_type bfd_reloc_val;
208 unsigned int rl78_reloc_val;
211 static const struct rl78_reloc_map rl78_reloc_map [] =
213 { BFD_RELOC_NONE, R_RL78_NONE },
214 { BFD_RELOC_8, R_RL78_DIR8S },
215 { BFD_RELOC_16, R_RL78_DIR16S },
216 { BFD_RELOC_24, R_RL78_DIR24S },
217 { BFD_RELOC_32, R_RL78_DIR32 },
218 { BFD_RELOC_RL78_16_OP, R_RL78_DIR16 },
219 { BFD_RELOC_RL78_DIR3U_PCREL, R_RL78_DIR3U_PCREL },
220 { BFD_RELOC_8_PCREL, R_RL78_DIR8S_PCREL },
221 { BFD_RELOC_16_PCREL, R_RL78_DIR16S_PCREL },
222 { BFD_RELOC_24_PCREL, R_RL78_DIR24S_PCREL },
223 { BFD_RELOC_RL78_8U, R_RL78_DIR8U },
224 { BFD_RELOC_RL78_16U, R_RL78_DIR16U },
225 { BFD_RELOC_RL78_SYM, R_RL78_SYM },
226 { BFD_RELOC_RL78_OP_SUBTRACT, R_RL78_OPsub },
227 { BFD_RELOC_RL78_OP_NEG, R_RL78_OPneg },
228 { BFD_RELOC_RL78_OP_AND, R_RL78_OPand },
229 { BFD_RELOC_RL78_OP_SHRA, R_RL78_OPshra },
230 { BFD_RELOC_RL78_ABS8, R_RL78_ABS8 },
231 { BFD_RELOC_RL78_ABS16, R_RL78_ABS16 },
232 { BFD_RELOC_RL78_ABS16_REV, R_RL78_ABS16_REV },
233 { BFD_RELOC_RL78_ABS32, R_RL78_ABS32 },
234 { BFD_RELOC_RL78_ABS32_REV, R_RL78_ABS32_REV },
235 { BFD_RELOC_RL78_ABS16UL, R_RL78_ABS16UL },
236 { BFD_RELOC_RL78_ABS16UW, R_RL78_ABS16UW },
237 { BFD_RELOC_RL78_ABS16U, R_RL78_ABS16U },
238 { BFD_RELOC_RL78_RELAX, R_RL78_RH_RELAX }
241 static reloc_howto_type *
242 rl78_reloc_type_lookup (bfd * abfd ATTRIBUTE_UNUSED,
243 bfd_reloc_code_real_type code)
247 if (code == BFD_RELOC_RL78_32_OP)
248 return rl78_elf_howto_table + R_RL78_DIR32;
250 for (i = ARRAY_SIZE (rl78_reloc_map); --i;)
251 if (rl78_reloc_map [i].bfd_reloc_val == code)
252 return rl78_elf_howto_table + rl78_reloc_map[i].rl78_reloc_val;
257 static reloc_howto_type *
258 rl78_reloc_name_lookup (bfd * abfd ATTRIBUTE_UNUSED, const char * r_name)
262 for (i = 0; i < ARRAY_SIZE (rl78_elf_howto_table); i++)
263 if (rl78_elf_howto_table[i].name != NULL
264 && strcasecmp (rl78_elf_howto_table[i].name, r_name) == 0)
265 return rl78_elf_howto_table + i;
270 /* Set the howto pointer for an RL78 ELF reloc. */
273 rl78_info_to_howto_rela (bfd * abfd ATTRIBUTE_UNUSED,
275 Elf_Internal_Rela * dst)
279 r_type = ELF32_R_TYPE (dst->r_info);
280 BFD_ASSERT (r_type < (unsigned int) R_RL78_max);
281 cache_ptr->howto = rl78_elf_howto_table + r_type;
285 get_symbol_value (const char * name,
286 bfd_reloc_status_type * status,
287 struct bfd_link_info * info,
289 asection * input_section,
293 struct bfd_link_hash_entry * h;
295 h = bfd_link_hash_lookup (info->hash, name, FALSE, FALSE, TRUE);
298 || (h->type != bfd_link_hash_defined
299 && h->type != bfd_link_hash_defweak))
300 * status = info->callbacks->undefined_symbol
301 (info, name, input_bfd, input_section, offset, TRUE);
303 value = (h->u.def.value
304 + h->u.def.section->output_section->vma
305 + h->u.def.section->output_offset);
311 get_romstart (bfd_reloc_status_type * status,
312 struct bfd_link_info * info,
317 static bfd_boolean cached = FALSE;
318 static bfd_vma cached_value = 0;
322 cached_value = get_symbol_value ("_start", status, info, abfd, sec, offset);
329 get_ramstart (bfd_reloc_status_type * status,
330 struct bfd_link_info * info,
335 static bfd_boolean cached = FALSE;
336 static bfd_vma cached_value = 0;
340 cached_value = get_symbol_value ("__datastart", status, info, abfd, sec, offset);
346 #define NUM_STACK_ENTRIES 16
347 static int32_t rl78_stack [ NUM_STACK_ENTRIES ];
348 static unsigned int rl78_stack_top;
350 #define RL78_STACK_PUSH(val) \
353 if (rl78_stack_top < NUM_STACK_ENTRIES) \
354 rl78_stack [rl78_stack_top ++] = (val); \
356 r = bfd_reloc_dangerous; \
360 #define RL78_STACK_POP(dest) \
363 if (rl78_stack_top > 0) \
364 (dest) = rl78_stack [-- rl78_stack_top]; \
366 (dest) = 0, r = bfd_reloc_dangerous; \
370 /* Relocate an RL78 ELF section.
371 There is some attempt to make this function usable for many architectures,
372 both USE_REL and USE_RELA ['twould be nice if such a critter existed],
373 if only to serve as a learning tool.
375 The RELOCATE_SECTION function is called by the new ELF backend linker
376 to handle the relocations for a section.
378 The relocs are always passed as Rela structures; if the section
379 actually uses Rel structures, the r_addend field will always be
382 This function is responsible for adjusting the section contents as
383 necessary, and (if using Rela relocs and generating a relocatable
384 output file) adjusting the reloc addend as necessary.
386 This function does not have to worry about setting the reloc
387 address or the reloc symbol index.
389 LOCAL_SYMS is a pointer to the swapped in local symbols.
391 LOCAL_SECTIONS is an array giving the section in the input file
392 corresponding to the st_shndx field of each local symbol.
394 The global hash table entry for the global symbols can be found
395 via elf_sym_hashes (input_bfd).
397 When generating relocatable output, this function must handle
398 STB_LOCAL/STT_SECTION symbols specially. The output symbol is
399 going to be the section symbol corresponding to the output
400 section, which means that the addend must be adjusted
404 rl78_elf_relocate_section
406 struct bfd_link_info * info,
408 asection * input_section,
410 Elf_Internal_Rela * relocs,
411 Elf_Internal_Sym * local_syms,
412 asection ** local_sections)
414 Elf_Internal_Shdr * symtab_hdr;
415 struct elf_link_hash_entry ** sym_hashes;
416 Elf_Internal_Rela * rel;
417 Elf_Internal_Rela * relend;
421 symtab_hdr = & elf_tdata (input_bfd)->symtab_hdr;
422 sym_hashes = elf_sym_hashes (input_bfd);
423 relend = relocs + input_section->reloc_count;
425 dynobj = elf_hash_table (info)->dynobj;
428 splt = bfd_get_linker_section (dynobj, ".plt");
430 for (rel = relocs; rel < relend; rel ++)
432 reloc_howto_type * howto;
433 unsigned long r_symndx;
434 Elf_Internal_Sym * sym;
436 struct elf_link_hash_entry * h;
438 bfd_reloc_status_type r;
439 const char * name = NULL;
440 bfd_boolean unresolved_reloc = TRUE;
443 r_type = ELF32_R_TYPE (rel->r_info);
444 r_symndx = ELF32_R_SYM (rel->r_info);
446 howto = rl78_elf_howto_table + ELF32_R_TYPE (rel->r_info);
452 if (r_symndx < symtab_hdr->sh_info)
454 sym = local_syms + r_symndx;
455 sec = local_sections [r_symndx];
456 relocation = _bfd_elf_rela_local_sym (output_bfd, sym, & sec, rel);
458 name = bfd_elf_string_from_elf_section
459 (input_bfd, symtab_hdr->sh_link, sym->st_name);
460 name = (sym->st_name == 0) ? bfd_section_name (input_bfd, sec) : name;
466 RELOC_FOR_GLOBAL_SYMBOL (info, input_bfd, input_section, rel,
467 r_symndx, symtab_hdr, sym_hashes, h,
468 sec, relocation, unresolved_reloc,
471 name = h->root.root.string;
474 if (sec != NULL && discarded_section (sec))
475 RELOC_AGAINST_DISCARDED_SECTION (info, input_bfd, input_section,
476 rel, 1, relend, howto, 0, contents);
478 if (info->relocatable)
480 /* This is a relocatable link. We don't have to change
481 anything, unless the reloc is against a section symbol,
482 in which case we have to adjust according to where the
483 section symbol winds up in the output section. */
484 if (sym != NULL && ELF_ST_TYPE (sym->st_info) == STT_SECTION)
485 rel->r_addend += sec->output_offset;
489 switch (ELF32_R_TYPE (rel->r_info))
496 plt_offset = &h->plt.offset;
498 plt_offset = elf_local_got_offsets (input_bfd) + r_symndx;
500 if (! valid_16bit_address (relocation))
502 /* If this is the first time we've processed this symbol,
503 fill in the plt entry with the correct symbol address. */
504 if ((*plt_offset & 1) == 0)
508 x = 0x000000ec; /* br !!abs24 */
509 x |= (relocation << 8) & 0xffffff00;
510 bfd_put_32 (input_bfd, x, splt->contents + *plt_offset);
514 relocation = (splt->output_section->vma
515 + splt->output_offset
516 + (*plt_offset & -2));
519 char *newname = bfd_malloc (strlen(name)+5);
520 strcpy (newname, name);
521 strcat(newname, ".plt");
522 _bfd_generic_link_add_one_symbol (info,
525 BSF_FUNCTION | BSF_WEAK,
538 if (h != NULL && h->root.type == bfd_link_hash_undefweak)
539 /* If the symbol is undefined and weak
540 then the relocation resolves to zero. */
544 if (howto->pc_relative)
546 relocation -= (input_section->output_section->vma
547 + input_section->output_offset
549 relocation -= bfd_get_reloc_size (howto);
552 relocation += rel->r_addend;
557 #define RANGE(a,b) if (a > (long) relocation || (long) relocation > b) r = bfd_reloc_overflow
558 #define ALIGN(m) if (relocation & m) r = bfd_reloc_other;
559 #define OP(i) (contents[rel->r_offset + (i)])
561 /* Opcode relocs are always big endian. Data relocs are bi-endian. */
567 case R_RL78_RH_RELAX:
570 case R_RL78_DIR8S_PCREL:
585 case R_RL78_DIR16S_PCREL:
586 RANGE (-32768, 32767);
588 OP (1) = relocation >> 8;
592 if ((relocation & 0xf0000) == 0xf0000)
593 relocation &= 0xffff;
594 RANGE (-32768, 65535);
596 OP (1) = relocation >> 8;
602 OP (1) = relocation >> 8;
606 RANGE (-32768, 65536);
608 OP (1) = relocation >> 8;
611 case R_RL78_DIR16_REV:
612 RANGE (-32768, 65536);
614 OP (0) = relocation >> 8;
617 case R_RL78_DIR3U_PCREL:
620 OP (0) |= relocation & 0x07;
623 case R_RL78_DIR24S_PCREL:
624 RANGE (-0x800000, 0x7fffff);
626 OP (1) = relocation >> 8;
627 OP (2) = relocation >> 16;
631 RANGE (-0x800000, 0x7fffff);
633 OP (1) = relocation >> 8;
634 OP (2) = relocation >> 16;
639 OP (1) = relocation >> 8;
640 OP (2) = relocation >> 16;
641 OP (3) = relocation >> 24;
644 case R_RL78_DIR32_REV:
646 OP (2) = relocation >> 8;
647 OP (1) = relocation >> 16;
648 OP (0) = relocation >> 24;
652 RANGE (0xfff00, 0xfffff);
653 OP (0) = relocation & 0xff;
656 case R_RL78_RH_SADDR:
657 RANGE (0xffe20, 0xfff1f);
658 OP (0) = relocation & 0xff;
661 /* Complex reloc handling: */
664 RL78_STACK_POP (relocation);
666 OP (1) = relocation >> 8;
667 OP (2) = relocation >> 16;
668 OP (3) = relocation >> 24;
671 case R_RL78_ABS32_REV:
672 RL78_STACK_POP (relocation);
674 OP (2) = relocation >> 8;
675 OP (1) = relocation >> 16;
676 OP (0) = relocation >> 24;
679 case R_RL78_ABS24S_PCREL:
681 RL78_STACK_POP (relocation);
682 RANGE (-0x800000, 0x7fffff);
684 OP (1) = relocation >> 8;
685 OP (2) = relocation >> 16;
689 RL78_STACK_POP (relocation);
690 RANGE (-32768, 65535);
692 OP (1) = relocation >> 8;
695 case R_RL78_ABS16_REV:
696 RL78_STACK_POP (relocation);
697 RANGE (-32768, 65535);
699 OP (0) = relocation >> 8;
702 case R_RL78_ABS16S_PCREL:
704 RL78_STACK_POP (relocation);
705 RANGE (-32768, 32767);
707 OP (1) = relocation >> 8;
711 RL78_STACK_POP (relocation);
714 OP (1) = relocation >> 8;
718 RL78_STACK_POP (relocation);
722 OP (1) = relocation >> 8;
726 RL78_STACK_POP (relocation);
730 OP (1) = relocation >> 8;
734 RL78_STACK_POP (relocation);
740 RL78_STACK_POP (relocation);
746 RL78_STACK_POP (relocation);
753 RL78_STACK_POP (relocation);
759 case R_RL78_ABS8S_PCREL:
761 RL78_STACK_POP (relocation);
767 if (r_symndx < symtab_hdr->sh_info)
768 RL78_STACK_PUSH (sec->output_section->vma
775 && (h->root.type == bfd_link_hash_defined
776 || h->root.type == bfd_link_hash_defweak))
777 RL78_STACK_PUSH (h->root.u.def.value
778 + sec->output_section->vma
782 _bfd_error_handler (_("Warning: RL78_SYM reloc with an unknown symbol"));
790 RL78_STACK_POP (tmp);
792 RL78_STACK_PUSH (tmp);
800 RL78_STACK_POP (tmp2);
801 RL78_STACK_POP (tmp1);
803 RL78_STACK_PUSH (tmp1);
811 RL78_STACK_POP (tmp2);
812 RL78_STACK_POP (tmp1);
814 RL78_STACK_PUSH (tmp2);
822 RL78_STACK_POP (tmp2);
823 RL78_STACK_POP (tmp1);
825 RL78_STACK_PUSH (tmp1);
833 RL78_STACK_POP (tmp2);
834 RL78_STACK_POP (tmp1);
836 RL78_STACK_PUSH (tmp1);
844 RL78_STACK_POP (tmp2);
845 RL78_STACK_POP (tmp1);
847 RL78_STACK_PUSH (tmp1);
855 RL78_STACK_POP (tmp2);
856 RL78_STACK_POP (tmp1);
858 RL78_STACK_PUSH (tmp1);
862 case R_RL78_OPsctsize:
863 RL78_STACK_PUSH (input_section->size);
866 case R_RL78_OPscttop:
867 RL78_STACK_PUSH (input_section->output_section->vma);
874 RL78_STACK_POP (tmp2);
875 RL78_STACK_POP (tmp1);
877 RL78_STACK_PUSH (tmp1);
885 RL78_STACK_POP (tmp2);
886 RL78_STACK_POP (tmp1);
888 RL78_STACK_PUSH (tmp1);
896 RL78_STACK_POP (tmp2);
897 RL78_STACK_POP (tmp1);
899 RL78_STACK_PUSH (tmp1);
907 RL78_STACK_POP (tmp);
909 RL78_STACK_PUSH (tmp);
917 RL78_STACK_POP (tmp2);
918 RL78_STACK_POP (tmp1);
920 RL78_STACK_PUSH (tmp1);
924 case R_RL78_OPromtop:
925 RL78_STACK_PUSH (get_romstart (&r, info, input_bfd, input_section, rel->r_offset));
928 case R_RL78_OPramtop:
929 RL78_STACK_PUSH (get_ramstart (&r, info, input_bfd, input_section, rel->r_offset));
933 r = bfd_reloc_notsupported;
937 if (r != bfd_reloc_ok)
939 const char * msg = NULL;
943 case bfd_reloc_overflow:
944 /* Catch the case of a missing function declaration
945 and emit a more helpful error message. */
946 if (r_type == R_RL78_DIR24S_PCREL)
947 msg = _("%B(%A): error: call to undefined function '%s'");
949 r = info->callbacks->reloc_overflow
950 (info, (h ? &h->root : NULL), name, howto->name, (bfd_vma) 0,
951 input_bfd, input_section, rel->r_offset);
954 case bfd_reloc_undefined:
955 r = info->callbacks->undefined_symbol
956 (info, name, input_bfd, input_section, rel->r_offset,
960 case bfd_reloc_other:
961 msg = _("%B(%A): warning: unaligned access to symbol '%s' in the small data area");
964 case bfd_reloc_outofrange:
965 msg = _("%B(%A): internal error: out of range error");
968 case bfd_reloc_notsupported:
969 msg = _("%B(%A): internal error: unsupported relocation error");
972 case bfd_reloc_dangerous:
973 msg = _("%B(%A): internal error: dangerous relocation");
977 msg = _("%B(%A): internal error: unknown error");
982 _bfd_error_handler (msg, input_bfd, input_section, name);
992 /* Function to set the ELF flag bits. */
995 rl78_elf_set_private_flags (bfd * abfd, flagword flags)
997 elf_elfheader (abfd)->e_flags = flags;
998 elf_flags_init (abfd) = TRUE;
1002 static bfd_boolean no_warn_mismatch = FALSE;
1004 void bfd_elf32_rl78_set_target_flags (bfd_boolean);
1007 bfd_elf32_rl78_set_target_flags (bfd_boolean user_no_warn_mismatch)
1009 no_warn_mismatch = user_no_warn_mismatch;
1012 /* Merge backend specific data from an object file to the output
1013 object file when linking. */
1016 rl78_elf_merge_private_bfd_data (bfd * ibfd, bfd * obfd)
1019 bfd_boolean error = FALSE;
1021 new_flags = elf_elfheader (ibfd)->e_flags;
1023 if (!elf_flags_init (obfd))
1025 /* First call, no flags set. */
1026 elf_flags_init (obfd) = TRUE;
1027 elf_elfheader (obfd)->e_flags = new_flags;
1034 rl78_elf_print_private_bfd_data (bfd * abfd, void * ptr)
1036 FILE * file = (FILE *) ptr;
1039 BFD_ASSERT (abfd != NULL && ptr != NULL);
1041 /* Print normal ELF private data. */
1042 _bfd_elf_print_private_bfd_data (abfd, ptr);
1044 flags = elf_elfheader (abfd)->e_flags;
1045 fprintf (file, _("private flags = 0x%lx:"), (long) flags);
1051 /* Return the MACH for an e_flags value. */
1054 elf32_rl78_machine (bfd * abfd)
1056 if ((elf_elfheader (abfd)->e_flags & EF_RL78_CPU_MASK) == EF_RL78_CPU_RL78)
1057 return bfd_mach_rl78;
1063 rl78_elf_object_p (bfd * abfd)
1065 bfd_default_set_arch_mach (abfd, bfd_arch_rl78,
1066 elf32_rl78_machine (abfd));
1072 rl78_dump_symtab (bfd * abfd, void * internal_syms, void * external_syms)
1075 Elf_Internal_Sym * isymbuf;
1076 Elf_Internal_Sym * isymend;
1077 Elf_Internal_Sym * isym;
1078 Elf_Internal_Shdr * symtab_hdr;
1079 bfd_boolean free_internal = FALSE, free_external = FALSE;
1081 char * st_info_stb_str;
1082 char * st_other_str;
1083 char * st_shndx_str;
1085 if (! internal_syms)
1087 internal_syms = bfd_malloc (1000);
1090 if (! external_syms)
1092 external_syms = bfd_malloc (1000);
1096 symtab_hdr = &elf_tdata (abfd)->symtab_hdr;
1097 locsymcount = symtab_hdr->sh_size / get_elf_backend_data (abfd)->s->sizeof_sym;
1099 isymbuf = bfd_elf_get_elf_syms (abfd, symtab_hdr,
1100 symtab_hdr->sh_info, 0,
1101 internal_syms, external_syms, NULL);
1103 isymbuf = internal_syms;
1104 isymend = isymbuf + locsymcount;
1106 for (isym = isymbuf ; isym < isymend ; isym++)
1108 switch (ELF_ST_TYPE (isym->st_info))
1110 case STT_FUNC: st_info_str = "STT_FUNC";
1111 case STT_SECTION: st_info_str = "STT_SECTION";
1112 case STT_FILE: st_info_str = "STT_FILE";
1113 case STT_OBJECT: st_info_str = "STT_OBJECT";
1114 case STT_TLS: st_info_str = "STT_TLS";
1115 default: st_info_str = "";
1117 switch (ELF_ST_BIND (isym->st_info))
1119 case STB_LOCAL: st_info_stb_str = "STB_LOCAL";
1120 case STB_GLOBAL: st_info_stb_str = "STB_GLOBAL";
1121 default: st_info_stb_str = "";
1123 switch (ELF_ST_VISIBILITY (isym->st_other))
1125 case STV_DEFAULT: st_other_str = "STV_DEFAULT";
1126 case STV_INTERNAL: st_other_str = "STV_INTERNAL";
1127 case STV_PROTECTED: st_other_str = "STV_PROTECTED";
1128 default: st_other_str = "";
1130 switch (isym->st_shndx)
1132 case SHN_ABS: st_shndx_str = "SHN_ABS";
1133 case SHN_COMMON: st_shndx_str = "SHN_COMMON";
1134 case SHN_UNDEF: st_shndx_str = "SHN_UNDEF";
1135 default: st_shndx_str = "";
1139 free (internal_syms);
1141 free (external_syms);
1145 rl78_get_reloc (long reloc)
1147 if (0 <= reloc && reloc < R_RL78_max)
1148 return rl78_elf_howto_table[reloc].name;
1154 /* support PLT for 16-bit references to 24-bit functions. */
1156 /* We support 16-bit pointers to code above 64k by generating a thunk
1157 below 64k containing a JMP instruction to the final address. */
1160 rl78_elf_check_relocs
1162 struct bfd_link_info * info,
1164 const Elf_Internal_Rela * relocs)
1166 Elf_Internal_Shdr * symtab_hdr;
1167 struct elf_link_hash_entry ** sym_hashes;
1168 const Elf_Internal_Rela * rel;
1169 const Elf_Internal_Rela * rel_end;
1170 bfd_vma *local_plt_offsets;
1174 if (info->relocatable)
1177 symtab_hdr = &elf_tdata (abfd)->symtab_hdr;
1178 sym_hashes = elf_sym_hashes (abfd);
1179 local_plt_offsets = elf_local_got_offsets (abfd);
1181 dynobj = elf_hash_table(info)->dynobj;
1183 rel_end = relocs + sec->reloc_count;
1184 for (rel = relocs; rel < rel_end; rel++)
1186 struct elf_link_hash_entry *h;
1187 unsigned long r_symndx;
1190 r_symndx = ELF32_R_SYM (rel->r_info);
1191 if (r_symndx < symtab_hdr->sh_info)
1195 h = sym_hashes[r_symndx - symtab_hdr->sh_info];
1196 while (h->root.type == bfd_link_hash_indirect
1197 || h->root.type == bfd_link_hash_warning)
1198 h = (struct elf_link_hash_entry *) h->root.u.i.link;
1201 switch (ELF32_R_TYPE (rel->r_info))
1203 /* This relocation describes a 16-bit pointer to a function.
1204 We may need to allocate a thunk in low memory; reserve memory
1208 elf_hash_table (info)->dynobj = dynobj = abfd;
1211 splt = bfd_get_linker_section (dynobj, ".plt");
1214 flagword flags = (SEC_ALLOC | SEC_LOAD | SEC_HAS_CONTENTS
1215 | SEC_IN_MEMORY | SEC_LINKER_CREATED
1216 | SEC_READONLY | SEC_CODE);
1217 splt = bfd_make_section_anyway_with_flags (dynobj, ".plt",
1220 || ! bfd_set_section_alignment (dynobj, splt, 1))
1226 offset = &h->plt.offset;
1229 if (local_plt_offsets == NULL)
1234 size = symtab_hdr->sh_info * sizeof (bfd_vma);
1235 local_plt_offsets = (bfd_vma *) bfd_alloc (abfd, size);
1236 if (local_plt_offsets == NULL)
1238 elf_local_got_offsets (abfd) = local_plt_offsets;
1240 for (i = 0; i < symtab_hdr->sh_info; i++)
1241 local_plt_offsets[i] = (bfd_vma) -1;
1243 offset = &local_plt_offsets[r_symndx];
1246 if (*offset == (bfd_vma) -1)
1248 *offset = splt->size;
1258 /* This must exist if dynobj is ever set. */
1261 rl78_elf_finish_dynamic_sections (bfd *abfd ATTRIBUTE_UNUSED,
1262 struct bfd_link_info *info)
1267 /* As an extra sanity check, verify that all plt entries have been
1268 filled in. However, relaxing might have changed the relocs so
1269 that some plt entries don't get filled in, so we have to skip
1270 this check if we're relaxing. Unfortunately, check_relocs is
1271 called before relaxation. */
1273 if (info->relax_trip > 0)
1275 if ((dynobj = elf_hash_table (info)->dynobj) != NULL
1276 && (splt = bfd_get_linker_section (dynobj, ".plt")) != NULL)
1278 bfd_byte *contents = splt->contents;
1279 unsigned int i, size = splt->size;
1280 for (i = 0; i < size; i += 4)
1282 unsigned int x = bfd_get_32 (dynobj, contents + i);
1283 BFD_ASSERT (x != 0);
1292 rl78_elf_always_size_sections (bfd *output_bfd ATTRIBUTE_UNUSED,
1293 struct bfd_link_info *info)
1298 if (info->relocatable)
1301 dynobj = elf_hash_table (info)->dynobj;
1305 splt = bfd_get_linker_section (dynobj, ".plt");
1306 BFD_ASSERT (splt != NULL);
1308 splt->contents = (bfd_byte *) bfd_zalloc (dynobj, splt->size);
1309 if (splt->contents == NULL)
1317 /* Handle relaxing. */
1319 /* A subroutine of rl78_elf_relax_section. If the global symbol H
1320 is within the low 64k, remove any entry for it in the plt. */
1322 struct relax_plt_data
1329 rl78_relax_plt_check (struct elf_link_hash_entry *h, void * xdata)
1331 struct relax_plt_data *data = (struct relax_plt_data *) xdata;
1333 if (h->plt.offset != (bfd_vma) -1)
1337 if (h->root.type == bfd_link_hash_undefined
1338 || h->root.type == bfd_link_hash_undefweak)
1341 address = (h->root.u.def.section->output_section->vma
1342 + h->root.u.def.section->output_offset
1343 + h->root.u.def.value);
1345 if (valid_16bit_address (address))
1348 data->splt->size -= 4;
1349 *data->again = TRUE;
1356 /* A subroutine of rl78_elf_relax_section. If the global symbol H
1357 previously had a plt entry, give it a new entry offset. */
1360 rl78_relax_plt_realloc (struct elf_link_hash_entry *h, void * xdata)
1362 bfd_vma *entry = (bfd_vma *) xdata;
1364 if (h->plt.offset != (bfd_vma) -1)
1366 h->plt.offset = *entry;
1374 rl78_elf_relax_plt_section (bfd *dynobj,
1376 struct bfd_link_info *info,
1379 struct relax_plt_data relax_plt_data;
1382 /* Assume nothing changes. */
1385 if (info->relocatable)
1388 /* We only relax the .plt section at the moment. */
1389 if (dynobj != elf_hash_table (info)->dynobj
1390 || strcmp (splt->name, ".plt") != 0)
1393 /* Quick check for an empty plt. */
1394 if (splt->size == 0)
1397 /* Map across all global symbols; see which ones happen to
1398 fall in the low 64k. */
1399 relax_plt_data.splt = splt;
1400 relax_plt_data.again = again;
1401 elf_link_hash_traverse (elf_hash_table (info), rl78_relax_plt_check,
1404 /* Likewise for local symbols, though that's somewhat less convenient
1405 as we have to walk the list of input bfds and swap in symbol data. */
1406 for (ibfd = info->input_bfds; ibfd ; ibfd = ibfd->link_next)
1408 bfd_vma *local_plt_offsets = elf_local_got_offsets (ibfd);
1409 Elf_Internal_Shdr *symtab_hdr;
1410 Elf_Internal_Sym *isymbuf = NULL;
1413 if (! local_plt_offsets)
1416 symtab_hdr = &elf_tdata (ibfd)->symtab_hdr;
1417 if (symtab_hdr->sh_info != 0)
1419 isymbuf = (Elf_Internal_Sym *) symtab_hdr->contents;
1420 if (isymbuf == NULL)
1421 isymbuf = bfd_elf_get_elf_syms (ibfd, symtab_hdr,
1422 symtab_hdr->sh_info, 0,
1424 if (isymbuf == NULL)
1428 for (idx = 0; idx < symtab_hdr->sh_info; ++idx)
1430 Elf_Internal_Sym *isym;
1434 if (local_plt_offsets[idx] == (bfd_vma) -1)
1437 isym = &isymbuf[idx];
1438 if (isym->st_shndx == SHN_UNDEF)
1440 else if (isym->st_shndx == SHN_ABS)
1441 tsec = bfd_abs_section_ptr;
1442 else if (isym->st_shndx == SHN_COMMON)
1443 tsec = bfd_com_section_ptr;
1445 tsec = bfd_section_from_elf_index (ibfd, isym->st_shndx);
1447 address = (tsec->output_section->vma
1448 + tsec->output_offset
1450 if (valid_16bit_address (address))
1452 local_plt_offsets[idx] = -1;
1459 && symtab_hdr->contents != (unsigned char *) isymbuf)
1461 if (! info->keep_memory)
1465 /* Cache the symbols for elf_link_input_bfd. */
1466 symtab_hdr->contents = (unsigned char *) isymbuf;
1471 /* If we changed anything, walk the symbols again to reallocate
1472 .plt entry addresses. */
1473 if (*again && splt->size > 0)
1477 elf_link_hash_traverse (elf_hash_table (info),
1478 rl78_relax_plt_realloc, &entry);
1480 for (ibfd = info->input_bfds; ibfd ; ibfd = ibfd->link_next)
1482 bfd_vma *local_plt_offsets = elf_local_got_offsets (ibfd);
1483 unsigned int nlocals = elf_tdata (ibfd)->symtab_hdr.sh_info;
1486 if (! local_plt_offsets)
1489 for (idx = 0; idx < nlocals; ++idx)
1490 if (local_plt_offsets[idx] != (bfd_vma) -1)
1492 local_plt_offsets[idx] = entry;
1501 /* Delete some bytes from a section while relaxing. */
1504 elf32_rl78_relax_delete_bytes (bfd *abfd, asection *sec, bfd_vma addr, int count,
1505 Elf_Internal_Rela *alignment_rel, int force_snip)
1507 Elf_Internal_Shdr * symtab_hdr;
1508 unsigned int sec_shndx;
1509 bfd_byte * contents;
1510 Elf_Internal_Rela * irel;
1511 Elf_Internal_Rela * irelend;
1512 Elf_Internal_Sym * isym;
1513 Elf_Internal_Sym * isymend;
1515 unsigned int symcount;
1516 struct elf_link_hash_entry ** sym_hashes;
1517 struct elf_link_hash_entry ** end_hashes;
1522 sec_shndx = _bfd_elf_section_from_bfd_section (abfd, sec);
1524 contents = elf_section_data (sec)->this_hdr.contents;
1526 /* The deletion must stop at the next alignment boundary, if
1527 ALIGNMENT_REL is non-NULL. */
1530 toaddr = alignment_rel->r_offset;
1532 irel = elf_section_data (sec)->relocs;
1533 irelend = irel + sec->reloc_count;
1535 /* Actually delete the bytes. */
1536 memmove (contents + addr, contents + addr + count,
1537 (size_t) (toaddr - addr - count));
1539 /* If we don't have an alignment marker to worry about, we can just
1540 shrink the section. Otherwise, we have to fill in the newly
1541 created gap with NOP insns (0x03). */
1545 memset (contents + toaddr - count, 0x03, count);
1547 /* Adjust all the relocs. */
1548 for (irel = elf_section_data (sec)->relocs; irel < irelend; irel++)
1550 /* Get the new reloc address. */
1551 if (irel->r_offset > addr
1552 && (irel->r_offset < toaddr
1553 || (force_snip && irel->r_offset == toaddr)))
1554 irel->r_offset -= count;
1556 /* If we see an ALIGN marker at the end of the gap, we move it
1557 to the beginning of the gap, since marking these gaps is what
1559 if (irel->r_offset == toaddr
1560 && ELF32_R_TYPE (irel->r_info) == R_RL78_RH_RELAX
1561 && irel->r_addend & RL78_RELAXA_ALIGN)
1562 irel->r_offset -= count;
1565 /* Adjust the local symbols defined in this section. */
1566 symtab_hdr = &elf_tdata (abfd)->symtab_hdr;
1567 isym = (Elf_Internal_Sym *) symtab_hdr->contents;
1568 isymend = isym + symtab_hdr->sh_info;
1570 for (; isym < isymend; isym++)
1572 /* If the symbol is in the range of memory we just moved, we
1573 have to adjust its value. */
1574 if (isym->st_shndx == sec_shndx
1575 && isym->st_value > addr
1576 && isym->st_value < toaddr)
1577 isym->st_value -= count;
1579 /* If the symbol *spans* the bytes we just deleted (i.e. it's
1580 *end* is in the moved bytes but it's *start* isn't), then we
1581 must adjust its size. */
1582 if (isym->st_shndx == sec_shndx
1583 && isym->st_value < addr
1584 && isym->st_value + isym->st_size > addr
1585 && isym->st_value + isym->st_size < toaddr)
1586 isym->st_size -= count;
1589 /* Now adjust the global symbols defined in this section. */
1590 symcount = (symtab_hdr->sh_size / sizeof (Elf32_External_Sym)
1591 - symtab_hdr->sh_info);
1592 sym_hashes = elf_sym_hashes (abfd);
1593 end_hashes = sym_hashes + symcount;
1595 for (; sym_hashes < end_hashes; sym_hashes++)
1597 struct elf_link_hash_entry *sym_hash = *sym_hashes;
1599 if ((sym_hash->root.type == bfd_link_hash_defined
1600 || sym_hash->root.type == bfd_link_hash_defweak)
1601 && sym_hash->root.u.def.section == sec)
1603 /* As above, adjust the value if needed. */
1604 if (sym_hash->root.u.def.value > addr
1605 && sym_hash->root.u.def.value < toaddr)
1606 sym_hash->root.u.def.value -= count;
1608 /* As above, adjust the size if needed. */
1609 if (sym_hash->root.u.def.value < addr
1610 && sym_hash->root.u.def.value + sym_hash->size > addr
1611 && sym_hash->root.u.def.value + sym_hash->size < toaddr)
1612 sym_hash->size -= count;
1619 /* Used to sort relocs by address. If relocs have the same address,
1620 we maintain their relative order, except that R_RL78_RH_RELAX
1621 alignment relocs must be the first reloc for any given address. */
1624 reloc_bubblesort (Elf_Internal_Rela * r, int count)
1628 bfd_boolean swappit;
1630 /* This is almost a classic bubblesort. It's the slowest sort, but
1631 we're taking advantage of the fact that the relocations are
1632 mostly in order already (the assembler emits them that way) and
1633 we need relocs with the same address to remain in the same
1639 for (i = 0; i < count - 1; i ++)
1641 if (r[i].r_offset > r[i + 1].r_offset)
1643 else if (r[i].r_offset < r[i + 1].r_offset)
1645 else if (ELF32_R_TYPE (r[i + 1].r_info) == R_RL78_RH_RELAX
1646 && (r[i + 1].r_addend & RL78_RELAXA_ALIGN))
1648 else if (ELF32_R_TYPE (r[i + 1].r_info) == R_RL78_RH_RELAX
1649 && (r[i + 1].r_addend & RL78_RELAXA_ELIGN)
1650 && !(ELF32_R_TYPE (r[i].r_info) == R_RL78_RH_RELAX
1651 && (r[i].r_addend & RL78_RELAXA_ALIGN)))
1658 Elf_Internal_Rela tmp;
1663 /* If we do move a reloc back, re-scan to see if it
1664 needs to be moved even further back. This avoids
1665 most of the O(n^2) behavior for our cases. */
1675 #define OFFSET_FOR_RELOC(rel, lrel, scale) \
1676 rl78_offset_for_reloc (abfd, rel + 1, symtab_hdr, shndx_buf, intsyms, \
1677 lrel, abfd, sec, link_info, scale)
1680 rl78_offset_for_reloc (bfd * abfd,
1681 Elf_Internal_Rela * rel,
1682 Elf_Internal_Shdr * symtab_hdr,
1683 Elf_External_Sym_Shndx * shndx_buf ATTRIBUTE_UNUSED,
1684 Elf_Internal_Sym * intsyms,
1685 Elf_Internal_Rela ** lrel,
1687 asection * input_section,
1688 struct bfd_link_info * info,
1692 bfd_reloc_status_type r;
1696 /* REL is the first of 1..N relocations. We compute the symbol
1697 value for each relocation, then combine them if needed. LREL
1698 gets a pointer to the last relocation used. */
1703 /* Get the value of the symbol referred to by the reloc. */
1704 if (ELF32_R_SYM (rel->r_info) < symtab_hdr->sh_info)
1706 /* A local symbol. */
1707 Elf_Internal_Sym *isym;
1710 isym = intsyms + ELF32_R_SYM (rel->r_info);
1712 if (isym->st_shndx == SHN_UNDEF)
1713 ssec = bfd_und_section_ptr;
1714 else if (isym->st_shndx == SHN_ABS)
1715 ssec = bfd_abs_section_ptr;
1716 else if (isym->st_shndx == SHN_COMMON)
1717 ssec = bfd_com_section_ptr;
1719 ssec = bfd_section_from_elf_index (abfd,
1722 /* Initial symbol value. */
1723 symval = isym->st_value;
1725 /* GAS may have made this symbol relative to a section, in
1726 which case, we have to add the addend to find the
1728 if (ELF_ST_TYPE (isym->st_info) == STT_SECTION)
1729 symval += rel->r_addend;
1733 if ((ssec->flags & SEC_MERGE)
1734 && ssec->sec_info_type == SEC_INFO_TYPE_MERGE)
1735 symval = _bfd_merged_section_offset (abfd, & ssec,
1736 elf_section_data (ssec)->sec_info,
1740 /* Now make the offset relative to where the linker is putting it. */
1743 ssec->output_section->vma + ssec->output_offset;
1745 symval += rel->r_addend;
1750 struct elf_link_hash_entry * h;
1752 /* An external symbol. */
1753 indx = ELF32_R_SYM (rel->r_info) - symtab_hdr->sh_info;
1754 h = elf_sym_hashes (abfd)[indx];
1755 BFD_ASSERT (h != NULL);
1757 if (h->root.type != bfd_link_hash_defined
1758 && h->root.type != bfd_link_hash_defweak)
1760 /* This appears to be a reference to an undefined
1761 symbol. Just ignore it--it will be caught by the
1762 regular reloc processing. */
1768 symval = (h->root.u.def.value
1769 + h->root.u.def.section->output_section->vma
1770 + h->root.u.def.section->output_offset);
1772 symval += rel->r_addend;
1775 switch (ELF32_R_TYPE (rel->r_info))
1778 RL78_STACK_PUSH (symval);
1782 RL78_STACK_POP (tmp1);
1784 RL78_STACK_PUSH (tmp1);
1788 RL78_STACK_POP (tmp1);
1789 RL78_STACK_POP (tmp2);
1791 RL78_STACK_PUSH (tmp1);
1795 RL78_STACK_POP (tmp1);
1796 RL78_STACK_POP (tmp2);
1798 RL78_STACK_PUSH (tmp2);
1802 RL78_STACK_POP (tmp1);
1803 RL78_STACK_POP (tmp2);
1805 RL78_STACK_PUSH (tmp1);
1809 RL78_STACK_POP (tmp1);
1810 RL78_STACK_POP (tmp2);
1812 RL78_STACK_PUSH (tmp1);
1816 RL78_STACK_POP (tmp1);
1817 RL78_STACK_POP (tmp2);
1819 RL78_STACK_PUSH (tmp1);
1823 RL78_STACK_POP (tmp1);
1824 RL78_STACK_POP (tmp2);
1826 RL78_STACK_PUSH (tmp1);
1829 case R_RL78_OPsctsize:
1830 RL78_STACK_PUSH (input_section->size);
1833 case R_RL78_OPscttop:
1834 RL78_STACK_PUSH (input_section->output_section->vma);
1838 RL78_STACK_POP (tmp1);
1839 RL78_STACK_POP (tmp2);
1841 RL78_STACK_PUSH (tmp1);
1845 RL78_STACK_POP (tmp1);
1846 RL78_STACK_POP (tmp2);
1848 RL78_STACK_PUSH (tmp1);
1852 RL78_STACK_POP (tmp1);
1853 RL78_STACK_POP (tmp2);
1855 RL78_STACK_PUSH (tmp1);
1859 RL78_STACK_POP (tmp1);
1861 RL78_STACK_PUSH (tmp1);
1865 RL78_STACK_POP (tmp1);
1866 RL78_STACK_POP (tmp2);
1868 RL78_STACK_PUSH (tmp1);
1871 case R_RL78_OPromtop:
1872 RL78_STACK_PUSH (get_romstart (&r, info, input_bfd, input_section, rel->r_offset));
1875 case R_RL78_OPramtop:
1876 RL78_STACK_PUSH (get_ramstart (&r, info, input_bfd, input_section, rel->r_offset));
1879 case R_RL78_DIR16UL:
1881 case R_RL78_ABS16UL:
1884 RL78_STACK_POP (symval);
1890 case R_RL78_DIR16UW:
1892 case R_RL78_ABS16UW:
1895 RL78_STACK_POP (symval);
1903 RL78_STACK_POP (symval);
1914 int prefix; /* or -1 for "no prefix" */
1915 int insn; /* or -1 for "end of list" */
1916 int insn_for_saddr; /* or -1 for "no alternative" */
1917 int insn_for_sfr; /* or -1 for "no alternative" */
1918 } relax_addr16[] = {
1919 { -1, 0x02, 0x06, -1 }, /* ADDW AX, !addr16 */
1920 { -1, 0x22, 0x26, -1 }, /* SUBW AX, !addr16 */
1921 { -1, 0x42, 0x46, -1 }, /* CMPW AX, !addr16 */
1922 { -1, 0x40, 0x4a, -1 }, /* CMP !addr16, #byte */
1924 { -1, 0x0f, 0x0b, -1 }, /* ADD A, !addr16 */
1925 { -1, 0x1f, 0x1b, -1 }, /* ADDC A, !addr16 */
1926 { -1, 0x2f, 0x2b, -1 }, /* SUB A, !addr16 */
1927 { -1, 0x3f, 0x3b, -1 }, /* SUBC A, !addr16 */
1928 { -1, 0x4f, 0x4b, -1 }, /* CMP A, !addr16 */
1929 { -1, 0x5f, 0x5b, -1 }, /* AND A, !addr16 */
1930 { -1, 0x6f, 0x6b, -1 }, /* OR A, !addr16 */
1931 { -1, 0x7f, 0x7b, -1 }, /* XOR A, !addr16 */
1933 { -1, 0x8f, 0x8d, 0x8e }, /* MOV A, !addr16 */
1934 { -1, 0x9f, 0x9d, 0x9e }, /* MOV !addr16, A */
1935 { -1, 0xaf, 0xad, 0xae }, /* MOVW AX, !addr16 */
1936 { -1, 0xbf, 0xbd, 0xbe }, /* MOVW !addr16, AX */
1937 { -1, 0xcf, 0xcd, 0xce }, /* MOVW !addr16, #word */
1939 { -1, 0xa0, 0xa4, -1 }, /* INC !addr16 */
1940 { -1, 0xa2, 0xa6, -1 }, /* INCW !addr16 */
1941 { -1, 0xb0, 0xb4, -1 }, /* DEC !addr16 */
1942 { -1, 0xb2, 0xb6, -1 }, /* DECW !addr16 */
1944 { -1, 0xd5, 0xd4, -1 }, /* CMP0 !addr16 */
1945 { -1, 0xe5, 0xe4, -1 }, /* ONEB !addr16 */
1946 { -1, 0xf5, 0xf4, -1 }, /* CLRB !addr16 */
1948 { -1, 0xd9, 0xd8, -1 }, /* MOV X, !addr16 */
1949 { -1, 0xe9, 0xe8, -1 }, /* MOV B, !addr16 */
1950 { -1, 0xf9, 0xf8, -1 }, /* MOV C, !addr16 */
1951 { -1, 0xdb, 0xda, -1 }, /* MOVW BC, !addr16 */
1952 { -1, 0xeb, 0xea, -1 }, /* MOVW DE, !addr16 */
1953 { -1, 0xfb, 0xfa, -1 }, /* MOVW HL, !addr16 */
1955 { 0x61, 0xaa, 0xa8, -1 }, /* XCH A, !addr16 */
1957 { 0x71, 0x00, 0x02, 0x0a }, /* SET1 !addr16.0 */
1958 { 0x71, 0x10, 0x12, 0x1a }, /* SET1 !addr16.0 */
1959 { 0x71, 0x20, 0x22, 0x2a }, /* SET1 !addr16.0 */
1960 { 0x71, 0x30, 0x32, 0x3a }, /* SET1 !addr16.0 */
1961 { 0x71, 0x40, 0x42, 0x4a }, /* SET1 !addr16.0 */
1962 { 0x71, 0x50, 0x52, 0x5a }, /* SET1 !addr16.0 */
1963 { 0x71, 0x60, 0x62, 0x6a }, /* SET1 !addr16.0 */
1964 { 0x71, 0x70, 0x72, 0x7a }, /* SET1 !addr16.0 */
1966 { 0x71, 0x08, 0x03, 0x0b }, /* CLR1 !addr16.0 */
1967 { 0x71, 0x18, 0x13, 0x1b }, /* CLR1 !addr16.0 */
1968 { 0x71, 0x28, 0x23, 0x2b }, /* CLR1 !addr16.0 */
1969 { 0x71, 0x38, 0x33, 0x3b }, /* CLR1 !addr16.0 */
1970 { 0x71, 0x48, 0x43, 0x4b }, /* CLR1 !addr16.0 */
1971 { 0x71, 0x58, 0x53, 0x5b }, /* CLR1 !addr16.0 */
1972 { 0x71, 0x68, 0x63, 0x6b }, /* CLR1 !addr16.0 */
1973 { 0x71, 0x78, 0x73, 0x7b }, /* CLR1 !addr16.0 */
1978 /* Relax one section. */
1981 rl78_elf_relax_section
1984 struct bfd_link_info * link_info,
1985 bfd_boolean * again)
1987 Elf_Internal_Shdr * symtab_hdr;
1988 Elf_Internal_Shdr * shndx_hdr;
1989 Elf_Internal_Rela * internal_relocs;
1990 Elf_Internal_Rela * free_relocs = NULL;
1991 Elf_Internal_Rela * irel;
1992 Elf_Internal_Rela * srel;
1993 Elf_Internal_Rela * irelend;
1994 Elf_Internal_Rela * next_alignment;
1995 bfd_byte * contents = NULL;
1996 bfd_byte * free_contents = NULL;
1997 Elf_Internal_Sym * intsyms = NULL;
1998 Elf_Internal_Sym * free_intsyms = NULL;
1999 Elf_External_Sym_Shndx * shndx_buf = NULL;
2001 bfd_vma symval ATTRIBUTE_UNUSED = 0;
2002 int pcrel ATTRIBUTE_UNUSED = 0;
2003 int code ATTRIBUTE_UNUSED = 0;
2004 int section_alignment_glue;
2007 if (abfd == elf_hash_table (link_info)->dynobj
2008 && strcmp (sec->name, ".plt") == 0)
2009 return rl78_elf_relax_plt_section (abfd, sec, link_info, again);
2011 /* Assume nothing changes. */
2014 /* We don't have to do anything for a relocatable link, if
2015 this section does not have relocs, or if this is not a
2017 if (link_info->relocatable
2018 || (sec->flags & SEC_RELOC) == 0
2019 || sec->reloc_count == 0
2020 || (sec->flags & SEC_CODE) == 0)
2023 symtab_hdr = &elf_tdata (abfd)->symtab_hdr;
2024 shndx_hdr = &elf_tdata (abfd)->symtab_shndx_hdr;
2026 /* Get the section contents. */
2027 if (elf_section_data (sec)->this_hdr.contents != NULL)
2028 contents = elf_section_data (sec)->this_hdr.contents;
2029 /* Go get them off disk. */
2032 if (! bfd_malloc_and_get_section (abfd, sec, &contents))
2034 elf_section_data (sec)->this_hdr.contents = contents;
2037 /* Read this BFD's symbols. */
2038 /* Get cached copy if it exists. */
2039 if (symtab_hdr->contents != NULL)
2040 intsyms = (Elf_Internal_Sym *) symtab_hdr->contents;
2043 intsyms = bfd_elf_get_elf_syms (abfd, symtab_hdr, symtab_hdr->sh_info, 0, NULL, NULL, NULL);
2044 symtab_hdr->contents = (bfd_byte *) intsyms;
2047 if (shndx_hdr->sh_size != 0)
2051 amt = symtab_hdr->sh_info;
2052 amt *= sizeof (Elf_External_Sym_Shndx);
2053 shndx_buf = (Elf_External_Sym_Shndx *) bfd_malloc (amt);
2054 if (shndx_buf == NULL)
2056 if (bfd_seek (abfd, shndx_hdr->sh_offset, SEEK_SET) != 0
2057 || bfd_bread (shndx_buf, amt, abfd) != amt)
2059 shndx_hdr->contents = (bfd_byte *) shndx_buf;
2062 /* Get a copy of the native relocations. */
2063 internal_relocs = (_bfd_elf_link_read_relocs
2064 (abfd, sec, NULL, (Elf_Internal_Rela *) NULL,
2065 link_info->keep_memory));
2066 if (internal_relocs == NULL)
2068 if (! link_info->keep_memory)
2069 free_relocs = internal_relocs;
2071 /* The RL_ relocs must be just before the operand relocs they go
2072 with, so we must sort them to guarantee this. We use bubblesort
2073 instead of qsort so we can guarantee that relocs with the same
2074 address remain in the same relative order. */
2075 reloc_bubblesort (internal_relocs, sec->reloc_count);
2077 /* Walk through them looking for relaxing opportunities. */
2078 irelend = internal_relocs + sec->reloc_count;
2081 /* This will either be NULL or a pointer to the next alignment
2083 next_alignment = internal_relocs;
2085 /* We calculate worst case shrinkage caused by alignment directives.
2086 No fool-proof, but better than either ignoring the problem or
2087 doing heavy duty analysis of all the alignment markers in all
2089 section_alignment_glue = 0;
2090 for (irel = internal_relocs; irel < irelend; irel++)
2091 if (ELF32_R_TYPE (irel->r_info) == R_RL78_RH_RELAX
2092 && irel->r_addend & RL78_RELAXA_ALIGN)
2094 int this_glue = 1 << (irel->r_addend & RL78_RELAXA_ANUM);
2096 if (section_alignment_glue < this_glue)
2097 section_alignment_glue = this_glue;
2099 /* Worst case is all 0..N alignments, in order, causing 2*N-1 byte
2101 section_alignment_glue *= 2;
2103 for (irel = internal_relocs; irel < irelend; irel++)
2105 unsigned char *insn;
2108 /* The insns we care about are all marked with one of these. */
2109 if (ELF32_R_TYPE (irel->r_info) != R_RL78_RH_RELAX)
2112 if (irel->r_addend & RL78_RELAXA_ALIGN
2113 || next_alignment == internal_relocs)
2115 /* When we delete bytes, we need to maintain all the alignments
2116 indicated. In addition, we need to be careful about relaxing
2117 jumps across alignment boundaries - these displacements
2118 *grow* when we delete bytes. For now, don't shrink
2119 displacements across an alignment boundary, just in case.
2120 Note that this only affects relocations to the same
2122 next_alignment += 2;
2123 while (next_alignment < irelend
2124 && (ELF32_R_TYPE (next_alignment->r_info) != R_RL78_RH_RELAX
2125 || !(next_alignment->r_addend & RL78_RELAXA_ELIGN)))
2127 if (next_alignment >= irelend || next_alignment->r_offset == 0)
2128 next_alignment = NULL;
2131 /* When we hit alignment markers, see if we've shrunk enough
2132 before them to reduce the gap without violating the alignment
2134 if (irel->r_addend & RL78_RELAXA_ALIGN)
2136 /* At this point, the next relocation *should* be the ELIGN
2138 Elf_Internal_Rela *erel = irel + 1;
2139 unsigned int alignment, nbytes;
2141 if (ELF32_R_TYPE (erel->r_info) != R_RL78_RH_RELAX)
2143 if (!(erel->r_addend & RL78_RELAXA_ELIGN))
2146 alignment = 1 << (irel->r_addend & RL78_RELAXA_ANUM);
2148 if (erel->r_offset - irel->r_offset < alignment)
2151 nbytes = erel->r_offset - irel->r_offset;
2152 nbytes /= alignment;
2153 nbytes *= alignment;
2155 elf32_rl78_relax_delete_bytes (abfd, sec, erel->r_offset-nbytes, nbytes, next_alignment,
2156 erel->r_offset == sec->size);
2162 if (irel->r_addend & RL78_RELAXA_ELIGN)
2165 insn = contents + irel->r_offset;
2167 nrelocs = irel->r_addend & RL78_RELAXA_RNUM;
2169 /* At this point, we have an insn that is a candidate for linker
2170 relaxation. There are NRELOCS relocs following that may be
2171 relaxed, although each reloc may be made of more than one
2172 reloc entry (such as gp-rel symbols). */
2174 /* Get the value of the symbol referred to by the reloc. Just
2175 in case this is the last reloc in the list, use the RL's
2176 addend to choose between this reloc (no addend) or the next
2177 (yes addend, which means at least one following reloc). */
2179 /* srel points to the "current" reloction for this insn -
2180 actually the last reloc for a given operand, which is the one
2181 we need to update. We check the relaxations in the same
2182 order that the relocations happen, so we'll just push it
2186 pc = sec->output_section->vma + sec->output_offset
2190 symval = OFFSET_FOR_RELOC (srel, &srel, &scale); \
2191 pcrel = symval - pc + srel->r_addend; \
2194 #define SNIPNR(offset, nbytes) \
2195 elf32_rl78_relax_delete_bytes (abfd, sec, (insn - contents) + offset, nbytes, next_alignment, 0);
2196 #define SNIP(offset, nbytes, newtype) \
2197 SNIPNR (offset, nbytes); \
2198 srel->r_info = ELF32_R_INFO (ELF32_R_SYM (srel->r_info), newtype)
2200 /* The order of these bit tests must match the order that the
2201 relocs appear in. Since we sorted those by offset, we can
2204 /*----------------------------------------------------------------------*/
2205 /* EF ad BR $rel8 pcrel
2206 ED al ah BR !abs16 abs
2207 EE al ah BR $!rel16 pcrel
2208 EC al ah as BR !!abs20 abs
2210 FD al ah CALL !abs16 abs
2211 FE al ah CALL $!rel16 pcrel
2212 FC al ah as CALL !!abs20 abs
2220 61 C8 EF ad SKC ; BR $rel8
2221 61 D8 EF ad SKNC ; BR $rel8
2222 61 E8 EF ad SKZ ; BR $rel8
2223 61 F8 EF ad SKNZ ; BR $rel8
2224 61 E3 EF ad SKH ; BR $rel8
2225 61 F3 EF ad SKNH ; BR $rel8
2228 if (irel->r_addend & RL78_RELAXA_BRA)
2234 case 0xec: /* BR !!abs20 */
2241 SNIP (2, 2, R_RL78_DIR8S_PCREL);
2244 else if (symval < 65536)
2247 insn[1] = symval & 0xff;
2248 insn[2] = symval >> 8;
2249 SNIP (2, 1, R_RL78_DIR16S);
2252 else if (pcrel < 32767
2256 insn[1] = pcrel & 0xff;
2257 insn[2] = pcrel >> 8;
2258 SNIP (2, 1, R_RL78_DIR16S_PCREL);
2263 case 0xee: /* BR $!pcrel16 */
2264 case 0xed: /* BR $!abs16 */
2270 SNIP (2, 1, R_RL78_DIR8S_PCREL);
2275 case 0xfc: /* CALL !!abs20 */
2279 insn[1] = symval & 0xff;
2280 insn[2] = symval >> 8;
2281 SNIP (2, 1, R_RL78_DIR16S);
2284 else if (pcrel < 32767
2288 insn[1] = pcrel & 0xff;
2289 insn[2] = pcrel >> 8;
2290 SNIP (2, 1, R_RL78_DIR16S_PCREL);
2295 case 0x61: /* PREFIX */
2296 /* For SKIP/BR, we change the BR opcode and delete the
2297 SKIP. That way, we don't have to find and change the
2298 relocation for the BR. */
2301 case 0xc8: /* SKC */
2302 if (insn[2] == 0xef)
2304 insn[2] = 0xde; /* BNC */
2309 case 0xd8: /* SKNC */
2310 if (insn[2] == 0xef)
2312 insn[2] = 0xdc; /* BC */
2317 case 0xe8: /* SKZ */
2318 if (insn[2] == 0xef)
2320 insn[2] = 0xdf; /* BNZ */
2325 case 0xf8: /* SKNZ */
2326 if (insn[2] == 0xef)
2328 insn[2] = 0xdd; /* BZ */
2333 case 0xe3: /* SKH */
2334 if (insn[2] == 0xef)
2336 insn[2] = 0xd3; /* BNH */
2337 SNIPNR (1, 1); /* we reuse the 0x61 prefix from the SKH */
2341 case 0xf3: /* SKNH */
2342 if (insn[2] == 0xef)
2344 insn[2] = 0xc3; /* BH */
2345 SNIPNR (1, 1); /* we reuse the 0x61 prefix from the SKH */
2354 if (irel->r_addend & RL78_RELAXA_ADDR16)
2356 /*----------------------------------------------------------------------*/
2357 /* Some insns have both a 16-bit address operand and an 8-bit
2358 variant if the address is within a special range:
2360 Address 16-bit operand SADDR range SFR range
2361 FFF00-FFFFF 0xff00-0xffff 0x00-0xff
2362 FFE20-FFF1F 0xfe20-0xff1f 0x00-0xff
2364 The RELAX_ADDR16[] array has the insn encodings for the
2365 16-bit operand version, as well as the SFR and SADDR
2366 variants. We only need to replace the encodings and
2369 Note: we intentionally do not attempt to decode and skip
2370 any ES: prefix, as adding ES: means the addr16 (likely)
2371 no longer points to saddr/sfr space.
2381 if (0xffe20 <= symval && symval <= 0xfffff)
2384 is_saddr = (0xffe20 <= symval && symval <= 0xfff1f);
2385 is_sfr = (0xfff00 <= symval && symval <= 0xfffff);
2387 for (idx = 0; relax_addr16[idx].insn != -1; idx ++)
2389 if (relax_addr16[idx].prefix != -1
2390 && insn[0] == relax_addr16[idx].prefix
2391 && insn[1] == relax_addr16[idx].insn)
2395 else if (relax_addr16[idx].prefix == -1
2396 && insn[0] == relax_addr16[idx].insn)
2403 /* We have a matched insn, and poff is 0 or 1 depending
2404 on the base pattern size. */
2406 if (is_sfr && relax_addr16[idx].insn_for_sfr != -1)
2408 insn[poff] = relax_addr16[idx].insn_for_sfr;
2409 SNIP (poff+2, 1, R_RL78_RH_SFR);
2412 else if (is_saddr && relax_addr16[idx].insn_for_saddr != -1)
2414 insn[poff] = relax_addr16[idx].insn_for_saddr;
2415 SNIP (poff+2, 1, R_RL78_RH_SADDR);
2422 /*----------------------------------------------------------------------*/
2429 if (free_relocs != NULL)
2432 if (free_contents != NULL)
2433 free (free_contents);
2435 if (shndx_buf != NULL)
2437 shndx_hdr->contents = NULL;
2441 if (free_intsyms != NULL)
2442 free (free_intsyms);
2449 #define ELF_ARCH bfd_arch_rl78
2450 #define ELF_MACHINE_CODE EM_RL78
2451 #define ELF_MAXPAGESIZE 0x1000
2453 #define TARGET_LITTLE_SYM bfd_elf32_rl78_vec
2454 #define TARGET_LITTLE_NAME "elf32-rl78"
2456 #define elf_info_to_howto_rel NULL
2457 #define elf_info_to_howto rl78_info_to_howto_rela
2458 #define elf_backend_object_p rl78_elf_object_p
2459 #define elf_backend_relocate_section rl78_elf_relocate_section
2460 #define elf_symbol_leading_char ('_')
2461 #define elf_backend_can_gc_sections 1
2463 #define bfd_elf32_bfd_reloc_type_lookup rl78_reloc_type_lookup
2464 #define bfd_elf32_bfd_reloc_name_lookup rl78_reloc_name_lookup
2465 #define bfd_elf32_bfd_set_private_flags rl78_elf_set_private_flags
2466 #define bfd_elf32_bfd_merge_private_bfd_data rl78_elf_merge_private_bfd_data
2467 #define bfd_elf32_bfd_print_private_bfd_data rl78_elf_print_private_bfd_data
2469 #define bfd_elf32_bfd_relax_section rl78_elf_relax_section
2470 #define elf_backend_check_relocs rl78_elf_check_relocs
2471 #define elf_backend_always_size_sections \
2472 rl78_elf_always_size_sections
2473 #define elf_backend_finish_dynamic_sections \
2474 rl78_elf_finish_dynamic_sections
2476 #include "elf32-target.h"