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[/] [open8_urisc/] [trunk/] [gnu/] [binutils/] [bfd/] [elf32-rl78.c] - Rev 299
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/* Renesas RL78 specific support for 32-bit ELF. Copyright (C) 2011 Free Software Foundation, Inc. This file is part of BFD, the Binary File Descriptor library. This program is free software; you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation; either version 3 of the License, or (at your option) any later version. This program is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details. You should have received a copy of the GNU General Public License along with this program; if not, write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */ #include "sysdep.h" #include "bfd.h" #include "bfd_stdint.h" #include "libbfd.h" #include "elf-bfd.h" #include "elf/rl78.h" #include "libiberty.h" #define valid_16bit_address(v) ((v) <= 0x0ffff || (v) >= 0xf0000) #define RL78REL(n,sz,bit,shift,complain,pcrel) \ HOWTO (R_RL78_##n, shift, sz, bit, pcrel, 0, complain_overflow_ ## complain, \ bfd_elf_generic_reloc, "R_RL78_" #n, FALSE, 0, ~0, FALSE) /* Note that the relocations around 0x7f are internal to this file; feel free to move them as needed to avoid conflicts with published relocation numbers. */ static reloc_howto_type rl78_elf_howto_table [] = { RL78REL (NONE, 0, 0, 0, dont, FALSE), RL78REL (DIR32, 2, 32, 0, signed, FALSE), RL78REL (DIR24S, 2, 24, 0, signed, FALSE), RL78REL (DIR16, 1, 16, 0, dont, FALSE), RL78REL (DIR16U, 1, 16, 0, unsigned, FALSE), RL78REL (DIR16S, 1, 16, 0, signed, FALSE), RL78REL (DIR8, 0, 8, 0, dont, FALSE), RL78REL (DIR8U, 0, 8, 0, unsigned, FALSE), RL78REL (DIR8S, 0, 8, 0, signed, FALSE), RL78REL (DIR24S_PCREL, 2, 24, 0, signed, TRUE), RL78REL (DIR16S_PCREL, 1, 16, 0, signed, TRUE), RL78REL (DIR8S_PCREL, 0, 8, 0, signed, TRUE), RL78REL (DIR16UL, 1, 16, 2, unsigned, FALSE), RL78REL (DIR16UW, 1, 16, 1, unsigned, FALSE), RL78REL (DIR8UL, 0, 8, 2, unsigned, FALSE), RL78REL (DIR8UW, 0, 8, 1, unsigned, FALSE), RL78REL (DIR32_REV, 1, 16, 0, dont, FALSE), RL78REL (DIR16_REV, 1, 16, 0, dont, FALSE), RL78REL (DIR3U_PCREL, 0, 3, 0, dont, TRUE), EMPTY_HOWTO (0x13), EMPTY_HOWTO (0x14), EMPTY_HOWTO (0x15), EMPTY_HOWTO (0x16), EMPTY_HOWTO (0x17), EMPTY_HOWTO (0x18), EMPTY_HOWTO (0x19), EMPTY_HOWTO (0x1a), EMPTY_HOWTO (0x1b), EMPTY_HOWTO (0x1c), EMPTY_HOWTO (0x1d), EMPTY_HOWTO (0x1e), EMPTY_HOWTO (0x1f), EMPTY_HOWTO (0x20), EMPTY_HOWTO (0x21), EMPTY_HOWTO (0x22), EMPTY_HOWTO (0x23), EMPTY_HOWTO (0x24), EMPTY_HOWTO (0x25), EMPTY_HOWTO (0x26), EMPTY_HOWTO (0x27), EMPTY_HOWTO (0x28), EMPTY_HOWTO (0x29), EMPTY_HOWTO (0x2a), EMPTY_HOWTO (0x2b), EMPTY_HOWTO (0x2c), RL78REL (RH_RELAX, 0, 0, 0, dont, FALSE), EMPTY_HOWTO (0x2e), EMPTY_HOWTO (0x2f), EMPTY_HOWTO (0x30), EMPTY_HOWTO (0x31), EMPTY_HOWTO (0x32), EMPTY_HOWTO (0x33), EMPTY_HOWTO (0x34), EMPTY_HOWTO (0x35), EMPTY_HOWTO (0x36), EMPTY_HOWTO (0x37), EMPTY_HOWTO (0x38), EMPTY_HOWTO (0x39), EMPTY_HOWTO (0x3a), EMPTY_HOWTO (0x3b), EMPTY_HOWTO (0x3c), EMPTY_HOWTO (0x3d), EMPTY_HOWTO (0x3e), EMPTY_HOWTO (0x3f), EMPTY_HOWTO (0x40), RL78REL (ABS32, 2, 32, 0, dont, FALSE), RL78REL (ABS24S, 2, 24, 0, signed, FALSE), RL78REL (ABS16, 1, 16, 0, dont, FALSE), RL78REL (ABS16U, 1, 16, 0, unsigned, FALSE), RL78REL (ABS16S, 1, 16, 0, signed, FALSE), RL78REL (ABS8, 0, 8, 0, dont, FALSE), RL78REL (ABS8U, 0, 8, 0, unsigned, FALSE), RL78REL (ABS8S, 0, 8, 0, signed, FALSE), RL78REL (ABS24S_PCREL, 2, 24, 0, signed, TRUE), RL78REL (ABS16S_PCREL, 1, 16, 0, signed, TRUE), RL78REL (ABS8S_PCREL, 0, 8, 0, signed, TRUE), RL78REL (ABS16UL, 1, 16, 0, unsigned, FALSE), RL78REL (ABS16UW, 1, 16, 0, unsigned, FALSE), RL78REL (ABS8UL, 0, 8, 0, unsigned, FALSE), RL78REL (ABS8UW, 0, 8, 0, unsigned, FALSE), RL78REL (ABS32_REV, 2, 32, 0, dont, FALSE), RL78REL (ABS16_REV, 1, 16, 0, dont, FALSE), #define STACK_REL_P(x) ((x) <= R_RL78_ABS16_REV && (x) >= R_RL78_ABS32) EMPTY_HOWTO (0x52), EMPTY_HOWTO (0x53), EMPTY_HOWTO (0x54), EMPTY_HOWTO (0x55), EMPTY_HOWTO (0x56), EMPTY_HOWTO (0x57), EMPTY_HOWTO (0x58), EMPTY_HOWTO (0x59), EMPTY_HOWTO (0x5a), EMPTY_HOWTO (0x5b), EMPTY_HOWTO (0x5c), EMPTY_HOWTO (0x5d), EMPTY_HOWTO (0x5e), EMPTY_HOWTO (0x5f), EMPTY_HOWTO (0x60), EMPTY_HOWTO (0x61), EMPTY_HOWTO (0x62), EMPTY_HOWTO (0x63), EMPTY_HOWTO (0x64), EMPTY_HOWTO (0x65), EMPTY_HOWTO (0x66), EMPTY_HOWTO (0x67), EMPTY_HOWTO (0x68), EMPTY_HOWTO (0x69), EMPTY_HOWTO (0x6a), EMPTY_HOWTO (0x6b), EMPTY_HOWTO (0x6c), EMPTY_HOWTO (0x6d), EMPTY_HOWTO (0x6e), EMPTY_HOWTO (0x6f), EMPTY_HOWTO (0x70), EMPTY_HOWTO (0x71), EMPTY_HOWTO (0x72), EMPTY_HOWTO (0x73), EMPTY_HOWTO (0x74), EMPTY_HOWTO (0x75), EMPTY_HOWTO (0x76), EMPTY_HOWTO (0x77), EMPTY_HOWTO (0x78), EMPTY_HOWTO (0x79), EMPTY_HOWTO (0x7a), EMPTY_HOWTO (0x7b), EMPTY_HOWTO (0x7c), EMPTY_HOWTO (0x7d), EMPTY_HOWTO (0x7e), EMPTY_HOWTO (0x7f), RL78REL (SYM, 2, 32, 0, dont, FALSE), RL78REL (OPneg, 2, 32, 0, dont, FALSE), RL78REL (OPadd, 2, 32, 0, dont, FALSE), RL78REL (OPsub, 2, 32, 0, dont, FALSE), RL78REL (OPmul, 2, 32, 0, dont, FALSE), RL78REL (OPdiv, 2, 32, 0, dont, FALSE), RL78REL (OPshla, 2, 32, 0, dont, FALSE), RL78REL (OPshra, 2, 32, 0, dont, FALSE), RL78REL (OPsctsize, 2, 32, 0, dont, FALSE), EMPTY_HOWTO (0x89), EMPTY_HOWTO (0x8a), EMPTY_HOWTO (0x8b), EMPTY_HOWTO (0x8c), RL78REL (OPscttop, 2, 32, 0, dont, FALSE), EMPTY_HOWTO (0x8e), EMPTY_HOWTO (0x8f), RL78REL (OPand, 2, 32, 0, dont, FALSE), RL78REL (OPor, 2, 32, 0, dont, FALSE), RL78REL (OPxor, 2, 32, 0, dont, FALSE), RL78REL (OPnot, 2, 32, 0, dont, FALSE), RL78REL (OPmod, 2, 32, 0, dont, FALSE), RL78REL (OPromtop, 2, 32, 0, dont, FALSE), RL78REL (OPramtop, 2, 32, 0, dont, FALSE) }; /* Map BFD reloc types to RL78 ELF reloc types. */ struct rl78_reloc_map { bfd_reloc_code_real_type bfd_reloc_val; unsigned int rl78_reloc_val; }; static const struct rl78_reloc_map rl78_reloc_map [] = { { BFD_RELOC_NONE, R_RL78_NONE }, { BFD_RELOC_8, R_RL78_DIR8S }, { BFD_RELOC_16, R_RL78_DIR16S }, { BFD_RELOC_24, R_RL78_DIR24S }, { BFD_RELOC_32, R_RL78_DIR32 }, { BFD_RELOC_RL78_16_OP, R_RL78_DIR16 }, { BFD_RELOC_RL78_DIR3U_PCREL, R_RL78_DIR3U_PCREL }, { BFD_RELOC_8_PCREL, R_RL78_DIR8S_PCREL }, { BFD_RELOC_16_PCREL, R_RL78_DIR16S_PCREL }, { BFD_RELOC_24_PCREL, R_RL78_DIR24S_PCREL }, { BFD_RELOC_RL78_8U, R_RL78_DIR8U }, { BFD_RELOC_RL78_16U, R_RL78_DIR16U }, { BFD_RELOC_RL78_SYM, R_RL78_SYM }, { BFD_RELOC_RL78_OP_SUBTRACT, R_RL78_OPsub }, { BFD_RELOC_RL78_OP_NEG, R_RL78_OPneg }, { BFD_RELOC_RL78_OP_AND, R_RL78_OPand }, { BFD_RELOC_RL78_OP_SHRA, R_RL78_OPshra }, { BFD_RELOC_RL78_ABS8, R_RL78_ABS8 }, { BFD_RELOC_RL78_ABS16, R_RL78_ABS16 }, { BFD_RELOC_RL78_ABS16_REV, R_RL78_ABS16_REV }, { BFD_RELOC_RL78_ABS32, R_RL78_ABS32 }, { BFD_RELOC_RL78_ABS32_REV, R_RL78_ABS32_REV }, { BFD_RELOC_RL78_ABS16UL, R_RL78_ABS16UL }, { BFD_RELOC_RL78_ABS16UW, R_RL78_ABS16UW }, { BFD_RELOC_RL78_ABS16U, R_RL78_ABS16U }, { BFD_RELOC_RL78_RELAX, R_RL78_RH_RELAX } }; static reloc_howto_type * rl78_reloc_type_lookup (bfd * abfd ATTRIBUTE_UNUSED, bfd_reloc_code_real_type code) { unsigned int i; if (code == BFD_RELOC_RL78_32_OP) return rl78_elf_howto_table + R_RL78_DIR32; for (i = ARRAY_SIZE (rl78_reloc_map); --i;) if (rl78_reloc_map [i].bfd_reloc_val == code) return rl78_elf_howto_table + rl78_reloc_map[i].rl78_reloc_val; return NULL; } static reloc_howto_type * rl78_reloc_name_lookup (bfd * abfd ATTRIBUTE_UNUSED, const char * r_name) { unsigned int i; for (i = 0; i < ARRAY_SIZE (rl78_elf_howto_table); i++) if (rl78_elf_howto_table[i].name != NULL && strcasecmp (rl78_elf_howto_table[i].name, r_name) == 0) return rl78_elf_howto_table + i; return NULL; } /* Set the howto pointer for an RL78 ELF reloc. */ static void rl78_info_to_howto_rela (bfd * abfd ATTRIBUTE_UNUSED, arelent * cache_ptr, Elf_Internal_Rela * dst) { unsigned int r_type; r_type = ELF32_R_TYPE (dst->r_info); BFD_ASSERT (r_type < (unsigned int) R_RL78_max); cache_ptr->howto = rl78_elf_howto_table + r_type; } static bfd_vma get_symbol_value (const char * name, bfd_reloc_status_type * status, struct bfd_link_info * info, bfd * input_bfd, asection * input_section, int offset) { bfd_vma value = 0; struct bfd_link_hash_entry * h; h = bfd_link_hash_lookup (info->hash, name, FALSE, FALSE, TRUE); if (h == NULL || (h->type != bfd_link_hash_defined && h->type != bfd_link_hash_defweak)) * status = info->callbacks->undefined_symbol (info, name, input_bfd, input_section, offset, TRUE); else value = (h->u.def.value + h->u.def.section->output_section->vma + h->u.def.section->output_offset); return value; } static bfd_vma get_romstart (bfd_reloc_status_type * status, struct bfd_link_info * info, bfd * abfd, asection * sec, int offset) { static bfd_boolean cached = FALSE; static bfd_vma cached_value = 0; if (!cached) { cached_value = get_symbol_value ("_start", status, info, abfd, sec, offset); cached = TRUE; } return cached_value; } static bfd_vma get_ramstart (bfd_reloc_status_type * status, struct bfd_link_info * info, bfd * abfd, asection * sec, int offset) { static bfd_boolean cached = FALSE; static bfd_vma cached_value = 0; if (!cached) { cached_value = get_symbol_value ("__datastart", status, info, abfd, sec, offset); cached = TRUE; } return cached_value; } #define NUM_STACK_ENTRIES 16 static int32_t rl78_stack [ NUM_STACK_ENTRIES ]; static unsigned int rl78_stack_top; #define RL78_STACK_PUSH(val) \ do \ { \ if (rl78_stack_top < NUM_STACK_ENTRIES) \ rl78_stack [rl78_stack_top ++] = (val); \ else \ r = bfd_reloc_dangerous; \ } \ while (0) #define RL78_STACK_POP(dest) \ do \ { \ if (rl78_stack_top > 0) \ (dest) = rl78_stack [-- rl78_stack_top]; \ else \ (dest) = 0, r = bfd_reloc_dangerous; \ } \ while (0) /* Relocate an RL78 ELF section. There is some attempt to make this function usable for many architectures, both USE_REL and USE_RELA ['twould be nice if such a critter existed], if only to serve as a learning tool. The RELOCATE_SECTION function is called by the new ELF backend linker to handle the relocations for a section. The relocs are always passed as Rela structures; if the section actually uses Rel structures, the r_addend field will always be zero. This function is responsible for adjusting the section contents as necessary, and (if using Rela relocs and generating a relocatable output file) adjusting the reloc addend as necessary. This function does not have to worry about setting the reloc address or the reloc symbol index. LOCAL_SYMS is a pointer to the swapped in local symbols. LOCAL_SECTIONS is an array giving the section in the input file corresponding to the st_shndx field of each local symbol. The global hash table entry for the global symbols can be found via elf_sym_hashes (input_bfd). When generating relocatable output, this function must handle STB_LOCAL/STT_SECTION symbols specially. The output symbol is going to be the section symbol corresponding to the output section, which means that the addend must be adjusted accordingly. */ static bfd_boolean rl78_elf_relocate_section (bfd * output_bfd, struct bfd_link_info * info, bfd * input_bfd, asection * input_section, bfd_byte * contents, Elf_Internal_Rela * relocs, Elf_Internal_Sym * local_syms, asection ** local_sections) { Elf_Internal_Shdr * symtab_hdr; struct elf_link_hash_entry ** sym_hashes; Elf_Internal_Rela * rel; Elf_Internal_Rela * relend; bfd *dynobj; asection *splt; symtab_hdr = & elf_tdata (input_bfd)->symtab_hdr; sym_hashes = elf_sym_hashes (input_bfd); relend = relocs + input_section->reloc_count; dynobj = elf_hash_table (info)->dynobj; splt = NULL; if (dynobj != NULL) splt = bfd_get_section_by_name (dynobj, ".plt"); for (rel = relocs; rel < relend; rel ++) { reloc_howto_type * howto; unsigned long r_symndx; Elf_Internal_Sym * sym; asection * sec; struct elf_link_hash_entry * h; bfd_vma relocation; bfd_reloc_status_type r; const char * name = NULL; bfd_boolean unresolved_reloc = TRUE; int r_type; r_type = ELF32_R_TYPE (rel->r_info); r_symndx = ELF32_R_SYM (rel->r_info); howto = rl78_elf_howto_table + ELF32_R_TYPE (rel->r_info); h = NULL; sym = NULL; sec = NULL; relocation = 0; if (r_symndx < symtab_hdr->sh_info) { sym = local_syms + r_symndx; sec = local_sections [r_symndx]; relocation = _bfd_elf_rela_local_sym (output_bfd, sym, & sec, rel); name = bfd_elf_string_from_elf_section (input_bfd, symtab_hdr->sh_link, sym->st_name); name = (sym->st_name == 0) ? bfd_section_name (input_bfd, sec) : name; } else { bfd_boolean warned; RELOC_FOR_GLOBAL_SYMBOL (info, input_bfd, input_section, rel, r_symndx, symtab_hdr, sym_hashes, h, sec, relocation, unresolved_reloc, warned); name = h->root.root.string; } if (sec != NULL && elf_discarded_section (sec)) RELOC_AGAINST_DISCARDED_SECTION (info, input_bfd, input_section, rel, relend, howto, contents); if (info->relocatable) { /* This is a relocatable link. We don't have to change anything, unless the reloc is against a section symbol, in which case we have to adjust according to where the section symbol winds up in the output section. */ if (sym != NULL && ELF_ST_TYPE (sym->st_info) == STT_SECTION) rel->r_addend += sec->output_offset; continue; } switch (ELF32_R_TYPE (rel->r_info)) { case R_RL78_DIR16S: { bfd_vma *plt_offset; if (h != NULL) plt_offset = &h->plt.offset; else plt_offset = elf_local_got_offsets (input_bfd) + r_symndx; if (! valid_16bit_address (relocation)) { /* If this is the first time we've processed this symbol, fill in the plt entry with the correct symbol address. */ if ((*plt_offset & 1) == 0) { unsigned int x; x = 0x000000ec; /* br !!abs24 */ x |= (relocation << 8) & 0xffffff00; bfd_put_32 (input_bfd, x, splt->contents + *plt_offset); *plt_offset |= 1; } relocation = (splt->output_section->vma + splt->output_offset + (*plt_offset & -2)); if (name) { char *newname = bfd_malloc (strlen(name)+5); strcpy (newname, name); strcat(newname, ".plt"); _bfd_generic_link_add_one_symbol (info, input_bfd, newname, BSF_FUNCTION | BSF_WEAK, splt, (*plt_offset & -2), 0, 1, 0, 0); } } } break; } if (h != NULL && h->root.type == bfd_link_hash_undefweak) /* If the symbol is undefined and weak then the relocation resolves to zero. */ relocation = 0; else { if (howto->pc_relative) { relocation -= (input_section->output_section->vma + input_section->output_offset + rel->r_offset); relocation -= bfd_get_reloc_size (howto); } relocation += rel->r_addend; } r = bfd_reloc_ok; #define RANGE(a,b) if (a > (long) relocation || (long) relocation > b) r = bfd_reloc_overflow #define ALIGN(m) if (relocation & m) r = bfd_reloc_other; #define OP(i) (contents[rel->r_offset + (i)]) /* Opcode relocs are always big endian. Data relocs are bi-endian. */ switch (r_type) { case R_RL78_NONE: break; case R_RL78_RH_RELAX: break; case R_RL78_DIR8S_PCREL: RANGE (-128, 127); OP (0) = relocation; break; case R_RL78_DIR8S: RANGE (-128, 255); OP (0) = relocation; break; case R_RL78_DIR8U: RANGE (0, 255); OP (0) = relocation; break; case R_RL78_DIR16S_PCREL: RANGE (-32768, 32767); OP (0) = relocation; OP (1) = relocation >> 8; break; case R_RL78_DIR16S: if ((relocation & 0xf0000) == 0xf0000) relocation &= 0xffff; RANGE (-32768, 65535); OP (0) = relocation; OP (1) = relocation >> 8; break; case R_RL78_DIR16U: RANGE (0, 65536); OP (0) = relocation; OP (1) = relocation >> 8; break; case R_RL78_DIR16: RANGE (-32768, 65536); OP (0) = relocation; OP (1) = relocation >> 8; break; case R_RL78_DIR16_REV: RANGE (-32768, 65536); OP (1) = relocation; OP (0) = relocation >> 8; break; case R_RL78_DIR3U_PCREL: RANGE (3, 10); OP (0) &= 0xf8; OP (0) |= relocation & 0x07; break; case R_RL78_DIR24S_PCREL: RANGE (-0x800000, 0x7fffff); OP (0) = relocation; OP (1) = relocation >> 8; OP (2) = relocation >> 16; break; case R_RL78_DIR24S: RANGE (-0x800000, 0x7fffff); OP (0) = relocation; OP (1) = relocation >> 8; OP (2) = relocation >> 16; break; case R_RL78_DIR32: OP (0) = relocation; OP (1) = relocation >> 8; OP (2) = relocation >> 16; OP (3) = relocation >> 24; break; case R_RL78_DIR32_REV: OP (3) = relocation; OP (2) = relocation >> 8; OP (1) = relocation >> 16; OP (0) = relocation >> 24; break; case R_RL78_RH_SFR: RANGE (0xfff00, 0xfffff); OP (0) = relocation & 0xff; break; case R_RL78_RH_SADDR: RANGE (0xffe20, 0xfff1f); OP (0) = relocation & 0xff; break; /* Complex reloc handling: */ case R_RL78_ABS32: RL78_STACK_POP (relocation); OP (0) = relocation; OP (1) = relocation >> 8; OP (2) = relocation >> 16; OP (3) = relocation >> 24; break; case R_RL78_ABS32_REV: RL78_STACK_POP (relocation); OP (3) = relocation; OP (2) = relocation >> 8; OP (1) = relocation >> 16; OP (0) = relocation >> 24; break; case R_RL78_ABS24S_PCREL: case R_RL78_ABS24S: RL78_STACK_POP (relocation); RANGE (-0x800000, 0x7fffff); OP (0) = relocation; OP (1) = relocation >> 8; OP (2) = relocation >> 16; break; case R_RL78_ABS16: RL78_STACK_POP (relocation); RANGE (-32768, 65535); OP (0) = relocation; OP (1) = relocation >> 8; break; case R_RL78_ABS16_REV: RL78_STACK_POP (relocation); RANGE (-32768, 65535); OP (1) = relocation; OP (0) = relocation >> 8; break; case R_RL78_ABS16S_PCREL: case R_RL78_ABS16S: RL78_STACK_POP (relocation); RANGE (-32768, 32767); OP (0) = relocation; OP (1) = relocation >> 8; break; case R_RL78_ABS16U: RL78_STACK_POP (relocation); RANGE (0, 65536); OP (0) = relocation; OP (1) = relocation >> 8; break; case R_RL78_ABS16UL: RL78_STACK_POP (relocation); relocation >>= 2; RANGE (0, 65536); OP (0) = relocation; OP (1) = relocation >> 8; break; case R_RL78_ABS16UW: RL78_STACK_POP (relocation); relocation >>= 1; RANGE (0, 65536); OP (0) = relocation; OP (1) = relocation >> 8; break; case R_RL78_ABS8: RL78_STACK_POP (relocation); RANGE (-128, 255); OP (0) = relocation; break; case R_RL78_ABS8U: RL78_STACK_POP (relocation); RANGE (0, 255); OP (0) = relocation; break; case R_RL78_ABS8UL: RL78_STACK_POP (relocation); relocation >>= 2; RANGE (0, 255); OP (0) = relocation; break; case R_RL78_ABS8UW: RL78_STACK_POP (relocation); relocation >>= 1; RANGE (0, 255); OP (0) = relocation; break; case R_RL78_ABS8S_PCREL: case R_RL78_ABS8S: RL78_STACK_POP (relocation); RANGE (-128, 127); OP (0) = relocation; break; case R_RL78_SYM: if (r_symndx < symtab_hdr->sh_info) RL78_STACK_PUSH (sec->output_section->vma + sec->output_offset + sym->st_value + rel->r_addend); else { if (h != NULL && (h->root.type == bfd_link_hash_defined || h->root.type == bfd_link_hash_defweak)) RL78_STACK_PUSH (h->root.u.def.value + sec->output_section->vma + sec->output_offset + rel->r_addend); else _bfd_error_handler (_("Warning: RL78_SYM reloc with an unknown symbol")); } break; case R_RL78_OPneg: { int32_t tmp; RL78_STACK_POP (tmp); tmp = - tmp; RL78_STACK_PUSH (tmp); } break; case R_RL78_OPadd: { int32_t tmp1, tmp2; RL78_STACK_POP (tmp2); RL78_STACK_POP (tmp1); tmp1 += tmp2; RL78_STACK_PUSH (tmp1); } break; case R_RL78_OPsub: { int32_t tmp1, tmp2; RL78_STACK_POP (tmp2); RL78_STACK_POP (tmp1); tmp2 -= tmp1; RL78_STACK_PUSH (tmp2); } break; case R_RL78_OPmul: { int32_t tmp1, tmp2; RL78_STACK_POP (tmp2); RL78_STACK_POP (tmp1); tmp1 *= tmp2; RL78_STACK_PUSH (tmp1); } break; case R_RL78_OPdiv: { int32_t tmp1, tmp2; RL78_STACK_POP (tmp2); RL78_STACK_POP (tmp1); tmp1 /= tmp2; RL78_STACK_PUSH (tmp1); } break; case R_RL78_OPshla: { int32_t tmp1, tmp2; RL78_STACK_POP (tmp2); RL78_STACK_POP (tmp1); tmp1 <<= tmp2; RL78_STACK_PUSH (tmp1); } break; case R_RL78_OPshra: { int32_t tmp1, tmp2; RL78_STACK_POP (tmp2); RL78_STACK_POP (tmp1); tmp1 >>= tmp2; RL78_STACK_PUSH (tmp1); } break; case R_RL78_OPsctsize: RL78_STACK_PUSH (input_section->size); break; case R_RL78_OPscttop: RL78_STACK_PUSH (input_section->output_section->vma); break; case R_RL78_OPand: { int32_t tmp1, tmp2; RL78_STACK_POP (tmp2); RL78_STACK_POP (tmp1); tmp1 &= tmp2; RL78_STACK_PUSH (tmp1); } break; case R_RL78_OPor: { int32_t tmp1, tmp2; RL78_STACK_POP (tmp2); RL78_STACK_POP (tmp1); tmp1 |= tmp2; RL78_STACK_PUSH (tmp1); } break; case R_RL78_OPxor: { int32_t tmp1, tmp2; RL78_STACK_POP (tmp2); RL78_STACK_POP (tmp1); tmp1 ^= tmp2; RL78_STACK_PUSH (tmp1); } break; case R_RL78_OPnot: { int32_t tmp; RL78_STACK_POP (tmp); tmp = ~ tmp; RL78_STACK_PUSH (tmp); } break; case R_RL78_OPmod: { int32_t tmp1, tmp2; RL78_STACK_POP (tmp2); RL78_STACK_POP (tmp1); tmp1 %= tmp2; RL78_STACK_PUSH (tmp1); } break; case R_RL78_OPromtop: RL78_STACK_PUSH (get_romstart (&r, info, input_bfd, input_section, rel->r_offset)); break; case R_RL78_OPramtop: RL78_STACK_PUSH (get_ramstart (&r, info, input_bfd, input_section, rel->r_offset)); break; default: r = bfd_reloc_notsupported; break; } if (r != bfd_reloc_ok) { const char * msg = NULL; switch (r) { case bfd_reloc_overflow: /* Catch the case of a missing function declaration and emit a more helpful error message. */ if (r_type == R_RL78_DIR24S_PCREL) msg = _("%B(%A): error: call to undefined function '%s'"); else r = info->callbacks->reloc_overflow (info, (h ? &h->root : NULL), name, howto->name, (bfd_vma) 0, input_bfd, input_section, rel->r_offset); break; case bfd_reloc_undefined: r = info->callbacks->undefined_symbol (info, name, input_bfd, input_section, rel->r_offset, TRUE); break; case bfd_reloc_other: msg = _("%B(%A): warning: unaligned access to symbol '%s' in the small data area"); break; case bfd_reloc_outofrange: msg = _("%B(%A): internal error: out of range error"); break; case bfd_reloc_notsupported: msg = _("%B(%A): internal error: unsupported relocation error"); break; case bfd_reloc_dangerous: msg = _("%B(%A): internal error: dangerous relocation"); break; default: msg = _("%B(%A): internal error: unknown error"); break; } if (msg) _bfd_error_handler (msg, input_bfd, input_section, name); if (! r) return FALSE; } } return TRUE; } /* Function to set the ELF flag bits. */ static bfd_boolean rl78_elf_set_private_flags (bfd * abfd, flagword flags) { elf_elfheader (abfd)->e_flags = flags; elf_flags_init (abfd) = TRUE; return TRUE; } static bfd_boolean no_warn_mismatch = FALSE; void bfd_elf32_rl78_set_target_flags (bfd_boolean); void bfd_elf32_rl78_set_target_flags (bfd_boolean user_no_warn_mismatch) { no_warn_mismatch = user_no_warn_mismatch; } /* Merge backend specific data from an object file to the output object file when linking. */ static bfd_boolean rl78_elf_merge_private_bfd_data (bfd * ibfd, bfd * obfd) { flagword new_flags; bfd_boolean error = FALSE; new_flags = elf_elfheader (ibfd)->e_flags; if (!elf_flags_init (obfd)) { /* First call, no flags set. */ elf_flags_init (obfd) = TRUE; elf_elfheader (obfd)->e_flags = new_flags; } return !error; } static bfd_boolean rl78_elf_print_private_bfd_data (bfd * abfd, void * ptr) { FILE * file = (FILE *) ptr; flagword flags; BFD_ASSERT (abfd != NULL && ptr != NULL); /* Print normal ELF private data. */ _bfd_elf_print_private_bfd_data (abfd, ptr); flags = elf_elfheader (abfd)->e_flags; fprintf (file, _("private flags = 0x%lx:"), (long) flags); fputc ('\n', file); return TRUE; } /* Return the MACH for an e_flags value. */ static int elf32_rl78_machine (bfd * abfd) { if ((elf_elfheader (abfd)->e_flags & EF_RL78_CPU_MASK) == EF_RL78_CPU_RL78) return bfd_mach_rl78; return 0; } static bfd_boolean rl78_elf_object_p (bfd * abfd) { bfd_default_set_arch_mach (abfd, bfd_arch_rl78, elf32_rl78_machine (abfd)); return TRUE; } #ifdef DEBUG void rl78_dump_symtab (bfd * abfd, void * internal_syms, void * external_syms) { size_t locsymcount; Elf_Internal_Sym * isymbuf; Elf_Internal_Sym * isymend; Elf_Internal_Sym * isym; Elf_Internal_Shdr * symtab_hdr; bfd_boolean free_internal = FALSE, free_external = FALSE; char * st_info_str; char * st_info_stb_str; char * st_other_str; char * st_shndx_str; if (! internal_syms) { internal_syms = bfd_malloc (1000); free_internal = 1; } if (! external_syms) { external_syms = bfd_malloc (1000); free_external = 1; } symtab_hdr = &elf_tdata (abfd)->symtab_hdr; locsymcount = symtab_hdr->sh_size / get_elf_backend_data (abfd)->s->sizeof_sym; if (free_internal) isymbuf = bfd_elf_get_elf_syms (abfd, symtab_hdr, symtab_hdr->sh_info, 0, internal_syms, external_syms, NULL); else isymbuf = internal_syms; isymend = isymbuf + locsymcount; for (isym = isymbuf ; isym < isymend ; isym++) { switch (ELF_ST_TYPE (isym->st_info)) { case STT_FUNC: st_info_str = "STT_FUNC"; case STT_SECTION: st_info_str = "STT_SECTION"; case STT_FILE: st_info_str = "STT_FILE"; case STT_OBJECT: st_info_str = "STT_OBJECT"; case STT_TLS: st_info_str = "STT_TLS"; default: st_info_str = ""; } switch (ELF_ST_BIND (isym->st_info)) { case STB_LOCAL: st_info_stb_str = "STB_LOCAL"; case STB_GLOBAL: st_info_stb_str = "STB_GLOBAL"; default: st_info_stb_str = ""; } switch (ELF_ST_VISIBILITY (isym->st_other)) { case STV_DEFAULT: st_other_str = "STV_DEFAULT"; case STV_INTERNAL: st_other_str = "STV_INTERNAL"; case STV_PROTECTED: st_other_str = "STV_PROTECTED"; default: st_other_str = ""; } switch (isym->st_shndx) { case SHN_ABS: st_shndx_str = "SHN_ABS"; case SHN_COMMON: st_shndx_str = "SHN_COMMON"; case SHN_UNDEF: st_shndx_str = "SHN_UNDEF"; default: st_shndx_str = ""; } } if (free_internal) free (internal_syms); if (free_external) free (external_syms); } char * rl78_get_reloc (long reloc) { if (0 <= reloc && reloc < R_RL78_max) return rl78_elf_howto_table[reloc].name; return ""; } #endif /* DEBUG */ /* support PLT for 16-bit references to 24-bit functions. */ /* We support 16-bit pointers to code above 64k by generating a thunk below 64k containing a JMP instruction to the final address. */ static bfd_boolean rl78_elf_check_relocs (bfd * abfd, struct bfd_link_info * info, asection * sec, const Elf_Internal_Rela * relocs) { Elf_Internal_Shdr * symtab_hdr; struct elf_link_hash_entry ** sym_hashes; const Elf_Internal_Rela * rel; const Elf_Internal_Rela * rel_end; bfd_vma *local_plt_offsets; asection *splt; bfd *dynobj; if (info->relocatable) return TRUE; symtab_hdr = &elf_tdata (abfd)->symtab_hdr; sym_hashes = elf_sym_hashes (abfd); local_plt_offsets = elf_local_got_offsets (abfd); splt = NULL; dynobj = elf_hash_table(info)->dynobj; rel_end = relocs + sec->reloc_count; for (rel = relocs; rel < rel_end; rel++) { struct elf_link_hash_entry *h; unsigned long r_symndx; bfd_vma *offset; r_symndx = ELF32_R_SYM (rel->r_info); if (r_symndx < symtab_hdr->sh_info) h = NULL; else { h = sym_hashes[r_symndx - symtab_hdr->sh_info]; while (h->root.type == bfd_link_hash_indirect || h->root.type == bfd_link_hash_warning) h = (struct elf_link_hash_entry *) h->root.u.i.link; } switch (ELF32_R_TYPE (rel->r_info)) { /* This relocation describes a 16-bit pointer to a function. We may need to allocate a thunk in low memory; reserve memory for it now. */ case R_RL78_DIR16S: if (dynobj == NULL) elf_hash_table (info)->dynobj = dynobj = abfd; if (splt == NULL) { splt = bfd_get_section_by_name (dynobj, ".plt"); if (splt == NULL) { flagword flags = (SEC_ALLOC | SEC_LOAD | SEC_HAS_CONTENTS | SEC_IN_MEMORY | SEC_LINKER_CREATED | SEC_READONLY | SEC_CODE); splt = bfd_make_section_with_flags (dynobj, ".plt", flags); if (splt == NULL || ! bfd_set_section_alignment (dynobj, splt, 1)) return FALSE; } } if (h != NULL) offset = &h->plt.offset; else { if (local_plt_offsets == NULL) { size_t size; unsigned int i; size = symtab_hdr->sh_info * sizeof (bfd_vma); local_plt_offsets = (bfd_vma *) bfd_alloc (abfd, size); if (local_plt_offsets == NULL) return FALSE; elf_local_got_offsets (abfd) = local_plt_offsets; for (i = 0; i < symtab_hdr->sh_info; i++) local_plt_offsets[i] = (bfd_vma) -1; } offset = &local_plt_offsets[r_symndx]; } if (*offset == (bfd_vma) -1) { *offset = splt->size; splt->size += 4; } break; } } return TRUE; } /* This must exist if dynobj is ever set. */ static bfd_boolean rl78_elf_finish_dynamic_sections (bfd *abfd ATTRIBUTE_UNUSED, struct bfd_link_info *info) { bfd *dynobj; asection *splt; /* As an extra sanity check, verify that all plt entries have been filled in. However, relaxing might have changed the relocs so that some plt entries don't get filled in, so we have to skip this check if we're relaxing. Unfortunately, check_relocs is called before relaxation. */ if (info->relax_trip > 0) { if ((dynobj = elf_hash_table (info)->dynobj) != NULL && (splt = bfd_get_section_by_name (dynobj, ".plt")) != NULL) { bfd_byte *contents = splt->contents; unsigned int i, size = splt->size; for (i = 0; i < size; i += 4) { unsigned int x = bfd_get_32 (dynobj, contents + i); BFD_ASSERT (x != 0); } } } return TRUE; } static bfd_boolean rl78_elf_always_size_sections (bfd *output_bfd ATTRIBUTE_UNUSED, struct bfd_link_info *info) { bfd *dynobj; asection *splt; if (info->relocatable) return TRUE; dynobj = elf_hash_table (info)->dynobj; if (dynobj == NULL) return TRUE; splt = bfd_get_section_by_name (dynobj, ".plt"); BFD_ASSERT (splt != NULL); splt->contents = (bfd_byte *) bfd_zalloc (dynobj, splt->size); if (splt->contents == NULL) return FALSE; return TRUE; } /* Handle relaxing. */ /* A subroutine of rl78_elf_relax_section. If the global symbol H is within the low 64k, remove any entry for it in the plt. */ struct relax_plt_data { asection *splt; bfd_boolean *again; }; static bfd_boolean rl78_relax_plt_check (struct elf_link_hash_entry *h, PTR xdata) { struct relax_plt_data *data = (struct relax_plt_data *) xdata; if (h->plt.offset != (bfd_vma) -1) { bfd_vma address; if (h->root.type == bfd_link_hash_undefined || h->root.type == bfd_link_hash_undefweak) address = 0; else address = (h->root.u.def.section->output_section->vma + h->root.u.def.section->output_offset + h->root.u.def.value); if (valid_16bit_address (address)) { h->plt.offset = -1; data->splt->size -= 4; *data->again = TRUE; } } return TRUE; } /* A subroutine of rl78_elf_relax_section. If the global symbol H previously had a plt entry, give it a new entry offset. */ static bfd_boolean rl78_relax_plt_realloc (struct elf_link_hash_entry *h, PTR xdata) { bfd_vma *entry = (bfd_vma *) xdata; if (h->plt.offset != (bfd_vma) -1) { h->plt.offset = *entry; *entry += 4; } return TRUE; } static bfd_boolean rl78_elf_relax_plt_section (bfd *dynobj, asection *splt, struct bfd_link_info *info, bfd_boolean *again) { struct relax_plt_data relax_plt_data; bfd *ibfd; /* Assume nothing changes. */ *again = FALSE; if (info->relocatable) return TRUE; /* We only relax the .plt section at the moment. */ if (dynobj != elf_hash_table (info)->dynobj || strcmp (splt->name, ".plt") != 0) return TRUE; /* Quick check for an empty plt. */ if (splt->size == 0) return TRUE; /* Map across all global symbols; see which ones happen to fall in the low 64k. */ relax_plt_data.splt = splt; relax_plt_data.again = again; elf_link_hash_traverse (elf_hash_table (info), rl78_relax_plt_check, &relax_plt_data); /* Likewise for local symbols, though that's somewhat less convenient as we have to walk the list of input bfds and swap in symbol data. */ for (ibfd = info->input_bfds; ibfd ; ibfd = ibfd->link_next) { bfd_vma *local_plt_offsets = elf_local_got_offsets (ibfd); Elf_Internal_Shdr *symtab_hdr; Elf_Internal_Sym *isymbuf = NULL; unsigned int idx; if (! local_plt_offsets) continue; symtab_hdr = &elf_tdata (ibfd)->symtab_hdr; if (symtab_hdr->sh_info != 0) { isymbuf = (Elf_Internal_Sym *) symtab_hdr->contents; if (isymbuf == NULL) isymbuf = bfd_elf_get_elf_syms (ibfd, symtab_hdr, symtab_hdr->sh_info, 0, NULL, NULL, NULL); if (isymbuf == NULL) return FALSE; } for (idx = 0; idx < symtab_hdr->sh_info; ++idx) { Elf_Internal_Sym *isym; asection *tsec; bfd_vma address; if (local_plt_offsets[idx] == (bfd_vma) -1) continue; isym = &isymbuf[idx]; if (isym->st_shndx == SHN_UNDEF) continue; else if (isym->st_shndx == SHN_ABS) tsec = bfd_abs_section_ptr; else if (isym->st_shndx == SHN_COMMON) tsec = bfd_com_section_ptr; else tsec = bfd_section_from_elf_index (ibfd, isym->st_shndx); address = (tsec->output_section->vma + tsec->output_offset + isym->st_value); if (valid_16bit_address (address)) { local_plt_offsets[idx] = -1; splt->size -= 4; *again = TRUE; } } if (isymbuf != NULL && symtab_hdr->contents != (unsigned char *) isymbuf) { if (! info->keep_memory) free (isymbuf); else { /* Cache the symbols for elf_link_input_bfd. */ symtab_hdr->contents = (unsigned char *) isymbuf; } } } /* If we changed anything, walk the symbols again to reallocate .plt entry addresses. */ if (*again && splt->size > 0) { bfd_vma entry = 0; elf_link_hash_traverse (elf_hash_table (info), rl78_relax_plt_realloc, &entry); for (ibfd = info->input_bfds; ibfd ; ibfd = ibfd->link_next) { bfd_vma *local_plt_offsets = elf_local_got_offsets (ibfd); unsigned int nlocals = elf_tdata (ibfd)->symtab_hdr.sh_info; unsigned int idx; if (! local_plt_offsets) continue; for (idx = 0; idx < nlocals; ++idx) if (local_plt_offsets[idx] != (bfd_vma) -1) { local_plt_offsets[idx] = entry; entry += 4; } } } return TRUE; } /* Delete some bytes from a section while relaxing. */ static bfd_boolean elf32_rl78_relax_delete_bytes (bfd *abfd, asection *sec, bfd_vma addr, int count, Elf_Internal_Rela *alignment_rel, int force_snip) { Elf_Internal_Shdr * symtab_hdr; unsigned int sec_shndx; bfd_byte * contents; Elf_Internal_Rela * irel; Elf_Internal_Rela * irelend; Elf_Internal_Sym * isym; Elf_Internal_Sym * isymend; bfd_vma toaddr; unsigned int symcount; struct elf_link_hash_entry ** sym_hashes; struct elf_link_hash_entry ** end_hashes; if (!alignment_rel) force_snip = 1; sec_shndx = _bfd_elf_section_from_bfd_section (abfd, sec); contents = elf_section_data (sec)->this_hdr.contents; /* The deletion must stop at the next alignment boundary, if ALIGNMENT_REL is non-NULL. */ toaddr = sec->size; if (alignment_rel) toaddr = alignment_rel->r_offset; irel = elf_section_data (sec)->relocs; irelend = irel + sec->reloc_count; /* Actually delete the bytes. */ memmove (contents + addr, contents + addr + count, (size_t) (toaddr - addr - count)); /* If we don't have an alignment marker to worry about, we can just shrink the section. Otherwise, we have to fill in the newly created gap with NOP insns (0x03). */ if (force_snip) sec->size -= count; else memset (contents + toaddr - count, 0x03, count); /* Adjust all the relocs. */ for (irel = elf_section_data (sec)->relocs; irel < irelend; irel++) { /* Get the new reloc address. */ if (irel->r_offset > addr && (irel->r_offset < toaddr || (force_snip && irel->r_offset == toaddr))) irel->r_offset -= count; /* If we see an ALIGN marker at the end of the gap, we move it to the beginning of the gap, since marking these gaps is what they're for. */ if (irel->r_offset == toaddr && ELF32_R_TYPE (irel->r_info) == R_RL78_RH_RELAX && irel->r_addend & RL78_RELAXA_ALIGN) irel->r_offset -= count; } /* Adjust the local symbols defined in this section. */ symtab_hdr = &elf_tdata (abfd)->symtab_hdr; isym = (Elf_Internal_Sym *) symtab_hdr->contents; isymend = isym + symtab_hdr->sh_info; for (; isym < isymend; isym++) { /* If the symbol is in the range of memory we just moved, we have to adjust its value. */ if (isym->st_shndx == sec_shndx && isym->st_value > addr && isym->st_value < toaddr) isym->st_value -= count; /* If the symbol *spans* the bytes we just deleted (i.e. it's *end* is in the moved bytes but it's *start* isn't), then we must adjust its size. */ if (isym->st_shndx == sec_shndx && isym->st_value < addr && isym->st_value + isym->st_size > addr && isym->st_value + isym->st_size < toaddr) isym->st_size -= count; } /* Now adjust the global symbols defined in this section. */ symcount = (symtab_hdr->sh_size / sizeof (Elf32_External_Sym) - symtab_hdr->sh_info); sym_hashes = elf_sym_hashes (abfd); end_hashes = sym_hashes + symcount; for (; sym_hashes < end_hashes; sym_hashes++) { struct elf_link_hash_entry *sym_hash = *sym_hashes; if ((sym_hash->root.type == bfd_link_hash_defined || sym_hash->root.type == bfd_link_hash_defweak) && sym_hash->root.u.def.section == sec) { /* As above, adjust the value if needed. */ if (sym_hash->root.u.def.value > addr && sym_hash->root.u.def.value < toaddr) sym_hash->root.u.def.value -= count; /* As above, adjust the size if needed. */ if (sym_hash->root.u.def.value < addr && sym_hash->root.u.def.value + sym_hash->size > addr && sym_hash->root.u.def.value + sym_hash->size < toaddr) sym_hash->size -= count; } } return TRUE; } /* Used to sort relocs by address. If relocs have the same address, we maintain their relative order, except that R_RL78_RH_RELAX alignment relocs must be the first reloc for any given address. */ static void reloc_bubblesort (Elf_Internal_Rela * r, int count) { int i; bfd_boolean again; bfd_boolean swappit; /* This is almost a classic bubblesort. It's the slowest sort, but we're taking advantage of the fact that the relocations are mostly in order already (the assembler emits them that way) and we need relocs with the same address to remain in the same relative order. */ again = TRUE; while (again) { again = FALSE; for (i = 0; i < count - 1; i ++) { if (r[i].r_offset > r[i + 1].r_offset) swappit = TRUE; else if (r[i].r_offset < r[i + 1].r_offset) swappit = FALSE; else if (ELF32_R_TYPE (r[i + 1].r_info) == R_RL78_RH_RELAX && (r[i + 1].r_addend & RL78_RELAXA_ALIGN)) swappit = TRUE; else if (ELF32_R_TYPE (r[i + 1].r_info) == R_RL78_RH_RELAX && (r[i + 1].r_addend & RL78_RELAXA_ELIGN) && !(ELF32_R_TYPE (r[i].r_info) == R_RL78_RH_RELAX && (r[i].r_addend & RL78_RELAXA_ALIGN))) swappit = TRUE; else swappit = FALSE; if (swappit) { Elf_Internal_Rela tmp; tmp = r[i]; r[i] = r[i + 1]; r[i + 1] = tmp; /* If we do move a reloc back, re-scan to see if it needs to be moved even further back. This avoids most of the O(n^2) behavior for our cases. */ if (i > 0) i -= 2; again = TRUE; } } } } #define OFFSET_FOR_RELOC(rel, lrel, scale) \ rl78_offset_for_reloc (abfd, rel + 1, symtab_hdr, shndx_buf, intsyms, \ lrel, abfd, sec, link_info, scale) static bfd_vma rl78_offset_for_reloc (bfd * abfd, Elf_Internal_Rela * rel, Elf_Internal_Shdr * symtab_hdr, Elf_External_Sym_Shndx * shndx_buf ATTRIBUTE_UNUSED, Elf_Internal_Sym * intsyms, Elf_Internal_Rela ** lrel, bfd * input_bfd, asection * input_section, struct bfd_link_info * info, int * scale) { bfd_vma symval; bfd_reloc_status_type r; *scale = 1; /* REL is the first of 1..N relocations. We compute the symbol value for each relocation, then combine them if needed. LREL gets a pointer to the last relocation used. */ while (1) { int32_t tmp1, tmp2; /* Get the value of the symbol referred to by the reloc. */ if (ELF32_R_SYM (rel->r_info) < symtab_hdr->sh_info) { /* A local symbol. */ Elf_Internal_Sym *isym; asection *ssec; isym = intsyms + ELF32_R_SYM (rel->r_info); if (isym->st_shndx == SHN_UNDEF) ssec = bfd_und_section_ptr; else if (isym->st_shndx == SHN_ABS) ssec = bfd_abs_section_ptr; else if (isym->st_shndx == SHN_COMMON) ssec = bfd_com_section_ptr; else ssec = bfd_section_from_elf_index (abfd, isym->st_shndx); /* Initial symbol value. */ symval = isym->st_value; /* GAS may have made this symbol relative to a section, in which case, we have to add the addend to find the symbol. */ if (ELF_ST_TYPE (isym->st_info) == STT_SECTION) symval += rel->r_addend; if (ssec) { if ((ssec->flags & SEC_MERGE) && ssec->sec_info_type == ELF_INFO_TYPE_MERGE) symval = _bfd_merged_section_offset (abfd, & ssec, elf_section_data (ssec)->sec_info, symval); } /* Now make the offset relative to where the linker is putting it. */ if (ssec) symval += ssec->output_section->vma + ssec->output_offset; symval += rel->r_addend; } else { unsigned long indx; struct elf_link_hash_entry * h; /* An external symbol. */ indx = ELF32_R_SYM (rel->r_info) - symtab_hdr->sh_info; h = elf_sym_hashes (abfd)[indx]; BFD_ASSERT (h != NULL); if (h->root.type != bfd_link_hash_defined && h->root.type != bfd_link_hash_defweak) { /* This appears to be a reference to an undefined symbol. Just ignore it--it will be caught by the regular reloc processing. */ if (lrel) *lrel = rel; return 0; } symval = (h->root.u.def.value + h->root.u.def.section->output_section->vma + h->root.u.def.section->output_offset); symval += rel->r_addend; } switch (ELF32_R_TYPE (rel->r_info)) { case R_RL78_SYM: RL78_STACK_PUSH (symval); break; case R_RL78_OPneg: RL78_STACK_POP (tmp1); tmp1 = - tmp1; RL78_STACK_PUSH (tmp1); break; case R_RL78_OPadd: RL78_STACK_POP (tmp1); RL78_STACK_POP (tmp2); tmp1 += tmp2; RL78_STACK_PUSH (tmp1); break; case R_RL78_OPsub: RL78_STACK_POP (tmp1); RL78_STACK_POP (tmp2); tmp2 -= tmp1; RL78_STACK_PUSH (tmp2); break; case R_RL78_OPmul: RL78_STACK_POP (tmp1); RL78_STACK_POP (tmp2); tmp1 *= tmp2; RL78_STACK_PUSH (tmp1); break; case R_RL78_OPdiv: RL78_STACK_POP (tmp1); RL78_STACK_POP (tmp2); tmp1 /= tmp2; RL78_STACK_PUSH (tmp1); break; case R_RL78_OPshla: RL78_STACK_POP (tmp1); RL78_STACK_POP (tmp2); tmp1 <<= tmp2; RL78_STACK_PUSH (tmp1); break; case R_RL78_OPshra: RL78_STACK_POP (tmp1); RL78_STACK_POP (tmp2); tmp1 >>= tmp2; RL78_STACK_PUSH (tmp1); break; case R_RL78_OPsctsize: RL78_STACK_PUSH (input_section->size); break; case R_RL78_OPscttop: RL78_STACK_PUSH (input_section->output_section->vma); break; case R_RL78_OPand: RL78_STACK_POP (tmp1); RL78_STACK_POP (tmp2); tmp1 &= tmp2; RL78_STACK_PUSH (tmp1); break; case R_RL78_OPor: RL78_STACK_POP (tmp1); RL78_STACK_POP (tmp2); tmp1 |= tmp2; RL78_STACK_PUSH (tmp1); break; case R_RL78_OPxor: RL78_STACK_POP (tmp1); RL78_STACK_POP (tmp2); tmp1 ^= tmp2; RL78_STACK_PUSH (tmp1); break; case R_RL78_OPnot: RL78_STACK_POP (tmp1); tmp1 = ~ tmp1; RL78_STACK_PUSH (tmp1); break; case R_RL78_OPmod: RL78_STACK_POP (tmp1); RL78_STACK_POP (tmp2); tmp1 %= tmp2; RL78_STACK_PUSH (tmp1); break; case R_RL78_OPromtop: RL78_STACK_PUSH (get_romstart (&r, info, input_bfd, input_section, rel->r_offset)); break; case R_RL78_OPramtop: RL78_STACK_PUSH (get_ramstart (&r, info, input_bfd, input_section, rel->r_offset)); break; case R_RL78_DIR16UL: case R_RL78_DIR8UL: case R_RL78_ABS16UL: case R_RL78_ABS8UL: if (rl78_stack_top) RL78_STACK_POP (symval); if (lrel) *lrel = rel; *scale = 4; return symval; case R_RL78_DIR16UW: case R_RL78_DIR8UW: case R_RL78_ABS16UW: case R_RL78_ABS8UW: if (rl78_stack_top) RL78_STACK_POP (symval); if (lrel) *lrel = rel; *scale = 2; return symval; default: if (rl78_stack_top) RL78_STACK_POP (symval); if (lrel) *lrel = rel; return symval; } rel ++; } } struct { int prefix; /* or -1 for "no prefix" */ int insn; /* or -1 for "end of list" */ int insn_for_saddr; /* or -1 for "no alternative" */ int insn_for_sfr; /* or -1 for "no alternative" */ } relax_addr16[] = { { -1, 0x02, 0x06, -1 }, /* ADDW AX, !addr16 */ { -1, 0x22, 0x26, -1 }, /* SUBW AX, !addr16 */ { -1, 0x42, 0x46, -1 }, /* CMPW AX, !addr16 */ { -1, 0x40, 0x4a, -1 }, /* CMP !addr16, #byte */ { -1, 0x0f, 0x0b, -1 }, /* ADD A, !addr16 */ { -1, 0x1f, 0x1b, -1 }, /* ADDC A, !addr16 */ { -1, 0x2f, 0x2b, -1 }, /* SUB A, !addr16 */ { -1, 0x3f, 0x3b, -1 }, /* SUBC A, !addr16 */ { -1, 0x4f, 0x4b, -1 }, /* CMP A, !addr16 */ { -1, 0x5f, 0x5b, -1 }, /* AND A, !addr16 */ { -1, 0x6f, 0x6b, -1 }, /* OR A, !addr16 */ { -1, 0x7f, 0x7b, -1 }, /* XOR A, !addr16 */ { -1, 0x8f, 0x8d, 0x8e }, /* MOV A, !addr16 */ { -1, 0x9f, 0x9d, 0x9e }, /* MOV !addr16, A */ { -1, 0xaf, 0xad, 0xae }, /* MOVW AX, !addr16 */ { -1, 0xbf, 0xbd, 0xbe }, /* MOVW !addr16, AX */ { -1, 0xcf, 0xcd, 0xce }, /* MOVW !addr16, #word */ { -1, 0xa0, 0xa4, -1 }, /* INC !addr16 */ { -1, 0xa2, 0xa6, -1 }, /* INCW !addr16 */ { -1, 0xb0, 0xb4, -1 }, /* DEC !addr16 */ { -1, 0xb2, 0xb6, -1 }, /* DECW !addr16 */ { -1, 0xd5, 0xd4, -1 }, /* CMP0 !addr16 */ { -1, 0xe5, 0xe4, -1 }, /* ONEB !addr16 */ { -1, 0xf5, 0xf4, -1 }, /* CLRB !addr16 */ { -1, 0xd9, 0xd8, -1 }, /* MOV X, !addr16 */ { -1, 0xe9, 0xe8, -1 }, /* MOV B, !addr16 */ { -1, 0xf9, 0xf8, -1 }, /* MOV C, !addr16 */ { -1, 0xdb, 0xda, -1 }, /* MOVW BC, !addr16 */ { -1, 0xeb, 0xea, -1 }, /* MOVW DE, !addr16 */ { -1, 0xfb, 0xfa, -1 }, /* MOVW HL, !addr16 */ { 0x61, 0xaa, 0xa8, -1 }, /* XCH A, !addr16 */ { 0x71, 0x00, 0x02, 0x0a }, /* SET1 !addr16.0 */ { 0x71, 0x10, 0x12, 0x1a }, /* SET1 !addr16.0 */ { 0x71, 0x20, 0x22, 0x2a }, /* SET1 !addr16.0 */ { 0x71, 0x30, 0x32, 0x3a }, /* SET1 !addr16.0 */ { 0x71, 0x40, 0x42, 0x4a }, /* SET1 !addr16.0 */ { 0x71, 0x50, 0x52, 0x5a }, /* SET1 !addr16.0 */ { 0x71, 0x60, 0x62, 0x6a }, /* SET1 !addr16.0 */ { 0x71, 0x70, 0x72, 0x7a }, /* SET1 !addr16.0 */ { 0x71, 0x08, 0x03, 0x0b }, /* CLR1 !addr16.0 */ { 0x71, 0x18, 0x13, 0x1b }, /* CLR1 !addr16.0 */ { 0x71, 0x28, 0x23, 0x2b }, /* CLR1 !addr16.0 */ { 0x71, 0x38, 0x33, 0x3b }, /* CLR1 !addr16.0 */ { 0x71, 0x48, 0x43, 0x4b }, /* CLR1 !addr16.0 */ { 0x71, 0x58, 0x53, 0x5b }, /* CLR1 !addr16.0 */ { 0x71, 0x68, 0x63, 0x6b }, /* CLR1 !addr16.0 */ { 0x71, 0x78, 0x73, 0x7b }, /* CLR1 !addr16.0 */ { -1, -1, -1, -1 } }; /* Relax one section. */ static bfd_boolean rl78_elf_relax_section (bfd * abfd, asection * sec, struct bfd_link_info * link_info, bfd_boolean * again) { Elf_Internal_Shdr * symtab_hdr; Elf_Internal_Shdr * shndx_hdr; Elf_Internal_Rela * internal_relocs; Elf_Internal_Rela * free_relocs = NULL; Elf_Internal_Rela * irel; Elf_Internal_Rela * srel; Elf_Internal_Rela * irelend; Elf_Internal_Rela * next_alignment; bfd_byte * contents = NULL; bfd_byte * free_contents = NULL; Elf_Internal_Sym * intsyms = NULL; Elf_Internal_Sym * free_intsyms = NULL; Elf_External_Sym_Shndx * shndx_buf = NULL; bfd_vma pc; bfd_vma symval ATTRIBUTE_UNUSED = 0; int pcrel ATTRIBUTE_UNUSED = 0; int code ATTRIBUTE_UNUSED = 0; int section_alignment_glue; int scale; if (abfd == elf_hash_table (link_info)->dynobj && strcmp (sec->name, ".plt") == 0) return rl78_elf_relax_plt_section (abfd, sec, link_info, again); /* Assume nothing changes. */ *again = FALSE; /* We don't have to do anything for a relocatable link, if this section does not have relocs, or if this is not a code section. */ if (link_info->relocatable || (sec->flags & SEC_RELOC) == 0 || sec->reloc_count == 0 || (sec->flags & SEC_CODE) == 0) return TRUE; symtab_hdr = &elf_tdata (abfd)->symtab_hdr; shndx_hdr = &elf_tdata (abfd)->symtab_shndx_hdr; /* Get the section contents. */ if (elf_section_data (sec)->this_hdr.contents != NULL) contents = elf_section_data (sec)->this_hdr.contents; /* Go get them off disk. */ else { if (! bfd_malloc_and_get_section (abfd, sec, &contents)) goto error_return; elf_section_data (sec)->this_hdr.contents = contents; } /* Read this BFD's symbols. */ /* Get cached copy if it exists. */ if (symtab_hdr->contents != NULL) intsyms = (Elf_Internal_Sym *) symtab_hdr->contents; else { intsyms = bfd_elf_get_elf_syms (abfd, symtab_hdr, symtab_hdr->sh_info, 0, NULL, NULL, NULL); symtab_hdr->contents = (bfd_byte *) intsyms; } if (shndx_hdr->sh_size != 0) { bfd_size_type amt; amt = symtab_hdr->sh_info; amt *= sizeof (Elf_External_Sym_Shndx); shndx_buf = (Elf_External_Sym_Shndx *) bfd_malloc (amt); if (shndx_buf == NULL) goto error_return; if (bfd_seek (abfd, shndx_hdr->sh_offset, SEEK_SET) != 0 || bfd_bread ((PTR) shndx_buf, amt, abfd) != amt) goto error_return; shndx_hdr->contents = (bfd_byte *) shndx_buf; } /* Get a copy of the native relocations. */ internal_relocs = (_bfd_elf_link_read_relocs (abfd, sec, (PTR) NULL, (Elf_Internal_Rela *) NULL, link_info->keep_memory)); if (internal_relocs == NULL) goto error_return; if (! link_info->keep_memory) free_relocs = internal_relocs; /* The RL_ relocs must be just before the operand relocs they go with, so we must sort them to guarantee this. We use bubblesort instead of qsort so we can guarantee that relocs with the same address remain in the same relative order. */ reloc_bubblesort (internal_relocs, sec->reloc_count); /* Walk through them looking for relaxing opportunities. */ irelend = internal_relocs + sec->reloc_count; /* This will either be NULL or a pointer to the next alignment relocation. */ next_alignment = internal_relocs; /* We calculate worst case shrinkage caused by alignment directives. No fool-proof, but better than either ignoring the problem or doing heavy duty analysis of all the alignment markers in all input sections. */ section_alignment_glue = 0; for (irel = internal_relocs; irel < irelend; irel++) if (ELF32_R_TYPE (irel->r_info) == R_RL78_RH_RELAX && irel->r_addend & RL78_RELAXA_ALIGN) { int this_glue = 1 << (irel->r_addend & RL78_RELAXA_ANUM); if (section_alignment_glue < this_glue) section_alignment_glue = this_glue; } /* Worst case is all 0..N alignments, in order, causing 2*N-1 byte shrinkage. */ section_alignment_glue *= 2; for (irel = internal_relocs; irel < irelend; irel++) { unsigned char *insn; int nrelocs; /* The insns we care about are all marked with one of these. */ if (ELF32_R_TYPE (irel->r_info) != R_RL78_RH_RELAX) continue; if (irel->r_addend & RL78_RELAXA_ALIGN || next_alignment == internal_relocs) { /* When we delete bytes, we need to maintain all the alignments indicated. In addition, we need to be careful about relaxing jumps across alignment boundaries - these displacements *grow* when we delete bytes. For now, don't shrink displacements across an alignment boundary, just in case. Note that this only affects relocations to the same section. */ next_alignment += 2; while (next_alignment < irelend && (ELF32_R_TYPE (next_alignment->r_info) != R_RL78_RH_RELAX || !(next_alignment->r_addend & RL78_RELAXA_ELIGN))) next_alignment ++; if (next_alignment >= irelend || next_alignment->r_offset == 0) next_alignment = NULL; } /* When we hit alignment markers, see if we've shrunk enough before them to reduce the gap without violating the alignment requirements. */ if (irel->r_addend & RL78_RELAXA_ALIGN) { /* At this point, the next relocation *should* be the ELIGN end marker. */ Elf_Internal_Rela *erel = irel + 1; unsigned int alignment, nbytes; if (ELF32_R_TYPE (erel->r_info) != R_RL78_RH_RELAX) continue; if (!(erel->r_addend & RL78_RELAXA_ELIGN)) continue; alignment = 1 << (irel->r_addend & RL78_RELAXA_ANUM); if (erel->r_offset - irel->r_offset < alignment) continue; nbytes = erel->r_offset - irel->r_offset; nbytes /= alignment; nbytes *= alignment; elf32_rl78_relax_delete_bytes (abfd, sec, erel->r_offset-nbytes, nbytes, next_alignment, erel->r_offset == sec->size); *again = TRUE; continue; } if (irel->r_addend & RL78_RELAXA_ELIGN) continue; insn = contents + irel->r_offset; nrelocs = irel->r_addend & RL78_RELAXA_RNUM; /* At this point, we have an insn that is a candidate for linker relaxation. There are NRELOCS relocs following that may be relaxed, although each reloc may be made of more than one reloc entry (such as gp-rel symbols). */ /* Get the value of the symbol referred to by the reloc. Just in case this is the last reloc in the list, use the RL's addend to choose between this reloc (no addend) or the next (yes addend, which means at least one following reloc). */ /* srel points to the "current" reloction for this insn - actually the last reloc for a given operand, which is the one we need to update. We check the relaxations in the same order that the relocations happen, so we'll just push it along as we go. */ srel = irel; pc = sec->output_section->vma + sec->output_offset + srel->r_offset; #define GET_RELOC \ symval = OFFSET_FOR_RELOC (srel, &srel, &scale); \ pcrel = symval - pc + srel->r_addend; \ nrelocs --; #define SNIPNR(offset, nbytes) \ elf32_rl78_relax_delete_bytes (abfd, sec, (insn - contents) + offset, nbytes, next_alignment, 0); #define SNIP(offset, nbytes, newtype) \ SNIPNR (offset, nbytes); \ srel->r_info = ELF32_R_INFO (ELF32_R_SYM (srel->r_info), newtype) /* The order of these bit tests must match the order that the relocs appear in. Since we sorted those by offset, we can predict them. */ /*----------------------------------------------------------------------*/ /* EF ad BR $rel8 pcrel ED al ah BR !abs16 abs EE al ah BR $!rel16 pcrel EC al ah as BR !!abs20 abs FD al ah CALL !abs16 abs FE al ah CALL $!rel16 pcrel FC al ah as CALL !!abs20 abs DC ad BC $rel8 DE ad BNC $rel8 DD ad BZ $rel8 DF ad BNZ $rel8 61 C3 ad BH $rel8 61 D3 ad BNH $rel8 61 C8 EF ad SKC ; BR $rel8 61 D8 EF ad SKNC ; BR $rel8 61 E8 EF ad SKZ ; BR $rel8 61 F8 EF ad SKNZ ; BR $rel8 61 E3 EF ad SKH ; BR $rel8 61 F3 EF ad SKNH ; BR $rel8 */ if (irel->r_addend & RL78_RELAXA_BRA) { GET_RELOC; switch (insn[0]) { case 0xec: /* BR !!abs20 */ if (pcrel < 127 && pcrel > -127) { insn[0] = 0xef; insn[1] = pcrel; SNIP (2, 2, R_RL78_DIR8S_PCREL); *again = TRUE; } else if (symval < 65536) { insn[0] = 0xed; insn[1] = symval & 0xff; insn[2] = symval >> 8; SNIP (2, 1, R_RL78_DIR16S); *again = TRUE; } else if (pcrel < 32767 && pcrel > -32767) { insn[0] = 0xee; insn[1] = pcrel & 0xff; insn[2] = pcrel >> 8; SNIP (2, 1, R_RL78_DIR16S_PCREL); *again = TRUE; } break; case 0xee: /* BR $!pcrel16 */ case 0xed: /* BR $!abs16 */ if (pcrel < 127 && pcrel > -127) { insn[0] = 0xef; insn[1] = pcrel; SNIP (2, 1, R_RL78_DIR8S_PCREL); *again = TRUE; } break; case 0xfc: /* CALL !!abs20 */ if (symval < 65536) { insn[0] = 0xfd; insn[1] = symval & 0xff; insn[2] = symval >> 8; SNIP (2, 1, R_RL78_DIR16S); *again = TRUE; } else if (pcrel < 32767 && pcrel > -32767) { insn[0] = 0xfe; insn[1] = pcrel & 0xff; insn[2] = pcrel >> 8; SNIP (2, 1, R_RL78_DIR16S_PCREL); *again = TRUE; } break; case 0x61: /* PREFIX */ /* For SKIP/BR, we change the BR opcode and delete the SKIP. That way, we don't have to find and change the relocation for the BR. */ switch (insn[1]) { case 0xc8: /* SKC */ if (insn[2] == 0xef) { insn[2] = 0xde; /* BNC */ SNIPNR (0, 2); } break; case 0xd8: /* SKNC */ if (insn[2] == 0xef) { insn[2] = 0xdc; /* BC */ SNIPNR (0, 2); } break; case 0xe8: /* SKZ */ if (insn[2] == 0xef) { insn[2] = 0xdf; /* BNZ */ SNIPNR (0, 2); } break; case 0xf8: /* SKNZ */ if (insn[2] == 0xef) { insn[2] = 0xdd; /* BZ */ SNIPNR (0, 2); } break; case 0xe3: /* SKH */ if (insn[2] == 0xef) { insn[2] = 0xd3; /* BNH */ SNIPNR (1, 1); /* we reuse the 0x61 prefix from the SKH */ } break; case 0xf3: /* SKNH */ if (insn[2] == 0xef) { insn[2] = 0xc3; /* BH */ SNIPNR (1, 1); /* we reuse the 0x61 prefix from the SKH */ } break; } break; } } if (irel->r_addend & RL78_RELAXA_ADDR16) { /*----------------------------------------------------------------------*/ /* Some insns have both a 16-bit address operand and an 8-bit variant if the address is within a special range: Address 16-bit operand SADDR range SFR range FFF00-FFFFF 0xff00-0xffff 0x00-0xff FFE20-FFF1F 0xfe20-0xff1f 0x00-0xff The RELAX_ADDR16[] array has the insn encodings for the 16-bit operand version, as well as the SFR and SADDR variants. We only need to replace the encodings and adjust the operand. Note: we intentionally do not attempt to decode and skip any ES: prefix, as adding ES: means the addr16 (likely) no longer points to saddr/sfr space. */ int is_sfr; int is_saddr; int idx; int poff; GET_RELOC; if (0xffe20 <= symval && symval <= 0xfffff) { is_saddr = (0xffe20 <= symval && symval <= 0xfff1f); is_sfr = (0xfff00 <= symval && symval <= 0xfffff); for (idx = 0; relax_addr16[idx].insn != -1; idx ++) { if (relax_addr16[idx].prefix != -1 && insn[0] == relax_addr16[idx].prefix && insn[1] == relax_addr16[idx].insn) { poff = 1; } else if (relax_addr16[idx].prefix == -1 && insn[0] == relax_addr16[idx].insn) { poff = 0; } else continue; /* We have a matched insn, and poff is 0 or 1 depending on the base pattern size. */ if (is_sfr && relax_addr16[idx].insn_for_sfr != -1) { insn[poff] = relax_addr16[idx].insn_for_sfr; SNIP (poff+2, 1, R_RL78_RH_SFR); } else if (is_saddr && relax_addr16[idx].insn_for_saddr != -1) { insn[poff] = relax_addr16[idx].insn_for_saddr; SNIP (poff+2, 1, R_RL78_RH_SADDR); } } } } /*----------------------------------------------------------------------*/ } return TRUE; error_return: if (free_relocs != NULL) free (free_relocs); if (free_contents != NULL) free (free_contents); if (shndx_buf != NULL) { shndx_hdr->contents = NULL; free (shndx_buf); } if (free_intsyms != NULL) free (free_intsyms); return TRUE; } #define ELF_ARCH bfd_arch_rl78 #define ELF_MACHINE_CODE EM_RL78 #define ELF_MAXPAGESIZE 0x1000 #define TARGET_LITTLE_SYM bfd_elf32_rl78_vec #define TARGET_LITTLE_NAME "elf32-rl78" #define elf_info_to_howto_rel NULL #define elf_info_to_howto rl78_info_to_howto_rela #define elf_backend_object_p rl78_elf_object_p #define elf_backend_relocate_section rl78_elf_relocate_section #define elf_symbol_leading_char ('_') #define elf_backend_can_gc_sections 1 #define bfd_elf32_bfd_reloc_type_lookup rl78_reloc_type_lookup #define bfd_elf32_bfd_reloc_name_lookup rl78_reloc_name_lookup #define bfd_elf32_bfd_set_private_flags rl78_elf_set_private_flags #define bfd_elf32_bfd_merge_private_bfd_data rl78_elf_merge_private_bfd_data #define bfd_elf32_bfd_print_private_bfd_data rl78_elf_print_private_bfd_data #define bfd_elf32_bfd_relax_section rl78_elf_relax_section #define elf_backend_check_relocs rl78_elf_check_relocs #define elf_backend_always_size_sections \ rl78_elf_always_size_sections #define elf_backend_finish_dynamic_sections \ rl78_elf_finish_dynamic_sections #include "elf32-target.h"
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