diff options
Diffstat (limited to 'binutils-2.25/bfd/elf32-crx.c')
| -rw-r--r-- | binutils-2.25/bfd/elf32-crx.c | 1331 |
1 files changed, 1331 insertions, 0 deletions
diff --git a/binutils-2.25/bfd/elf32-crx.c b/binutils-2.25/bfd/elf32-crx.c new file mode 100644 index 00000000..601f715c --- /dev/null +++ b/binutils-2.25/bfd/elf32-crx.c @@ -0,0 +1,1331 @@ +/* BFD back-end for National Semiconductor's CRX ELF + Copyright 2004, 2005, 2006, 2007, 2009, 2010, 2012 + Free Software Foundation, Inc. + Written by Tomer Levi, NSC, Israel. + + 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., 51 Franklin Street - Fifth Floor, Boston, + MA 02110-1301, USA. */ + +#include "sysdep.h" +#include "bfd.h" +#include "bfdlink.h" +#include "libbfd.h" +#include "elf-bfd.h" +#include "elf/crx.h" + +static reloc_howto_type *elf_crx_reloc_type_lookup + (bfd *, bfd_reloc_code_real_type); +static void elf_crx_info_to_howto + (bfd *, arelent *, Elf_Internal_Rela *); +static bfd_boolean elf32_crx_relax_delete_bytes + (struct bfd_link_info *, bfd *, asection *, bfd_vma, int); +static bfd_reloc_status_type crx_elf_final_link_relocate + (reloc_howto_type *, bfd *, bfd *, asection *, + bfd_byte *, bfd_vma, bfd_vma, bfd_vma, + struct bfd_link_info *, asection *, int); +static bfd_boolean elf32_crx_relocate_section + (bfd *, struct bfd_link_info *, bfd *, asection *, bfd_byte *, + Elf_Internal_Rela *, Elf_Internal_Sym *, asection **); +static bfd_boolean elf32_crx_relax_section + (bfd *, asection *, struct bfd_link_info *, bfd_boolean *); +static bfd_byte * elf32_crx_get_relocated_section_contents + (bfd *, struct bfd_link_info *, struct bfd_link_order *, + bfd_byte *, bfd_boolean, asymbol **); + +/* crx_reloc_map array maps BFD relocation enum into a CRGAS relocation type. */ + +struct crx_reloc_map +{ + bfd_reloc_code_real_type bfd_reloc_enum; /* BFD relocation enum. */ + unsigned short crx_reloc_type; /* CRX relocation type. */ +}; + +static const struct crx_reloc_map crx_reloc_map[R_CRX_MAX] = +{ + {BFD_RELOC_NONE, R_CRX_NONE}, + {BFD_RELOC_CRX_REL4, R_CRX_REL4}, + {BFD_RELOC_CRX_REL8, R_CRX_REL8}, + {BFD_RELOC_CRX_REL8_CMP, R_CRX_REL8_CMP}, + {BFD_RELOC_CRX_REL16, R_CRX_REL16}, + {BFD_RELOC_CRX_REL24, R_CRX_REL24}, + {BFD_RELOC_CRX_REL32, R_CRX_REL32}, + {BFD_RELOC_CRX_REGREL12, R_CRX_REGREL12}, + {BFD_RELOC_CRX_REGREL22, R_CRX_REGREL22}, + {BFD_RELOC_CRX_REGREL28, R_CRX_REGREL28}, + {BFD_RELOC_CRX_REGREL32, R_CRX_REGREL32}, + {BFD_RELOC_CRX_ABS16, R_CRX_ABS16}, + {BFD_RELOC_CRX_ABS32, R_CRX_ABS32}, + {BFD_RELOC_CRX_NUM8, R_CRX_NUM8}, + {BFD_RELOC_CRX_NUM16, R_CRX_NUM16}, + {BFD_RELOC_CRX_NUM32, R_CRX_NUM32}, + {BFD_RELOC_CRX_IMM16, R_CRX_IMM16}, + {BFD_RELOC_CRX_IMM32, R_CRX_IMM32}, + {BFD_RELOC_CRX_SWITCH8, R_CRX_SWITCH8}, + {BFD_RELOC_CRX_SWITCH16, R_CRX_SWITCH16}, + {BFD_RELOC_CRX_SWITCH32, R_CRX_SWITCH32} +}; + +static reloc_howto_type crx_elf_howto_table[] = +{ + HOWTO (R_CRX_NONE, /* type */ + 0, /* rightshift */ + 2, /* size */ + 32, /* bitsize */ + FALSE, /* pc_relative */ + 0, /* bitpos */ + complain_overflow_dont,/* complain_on_overflow */ + bfd_elf_generic_reloc, /* special_function */ + "R_CRX_NONE", /* name */ + FALSE, /* partial_inplace */ + 0, /* src_mask */ + 0, /* dst_mask */ + FALSE), /* pcrel_offset */ + + HOWTO (R_CRX_REL4, /* type */ + 1, /* rightshift */ + 0, /* size */ + 4, /* bitsize */ + TRUE, /* pc_relative */ + 0, /* bitpos */ + complain_overflow_bitfield,/* complain_on_overflow */ + bfd_elf_generic_reloc, /* special_function */ + "R_CRX_REL4", /* name */ + FALSE, /* partial_inplace */ + 0x0, /* src_mask */ + 0xf, /* dst_mask */ + FALSE), /* pcrel_offset */ + + HOWTO (R_CRX_REL8, /* type */ + 1, /* rightshift */ + 0, /* size */ + 8, /* bitsize */ + TRUE, /* pc_relative */ + 0, /* bitpos */ + complain_overflow_bitfield,/* complain_on_overflow */ + bfd_elf_generic_reloc, /* special_function */ + "R_CRX_REL8", /* name */ + FALSE, /* partial_inplace */ + 0x0, /* src_mask */ + 0xff, /* dst_mask */ + FALSE), /* pcrel_offset */ + + HOWTO (R_CRX_REL8_CMP, /* type */ + 1, /* rightshift */ + 0, /* size */ + 8, /* bitsize */ + TRUE, /* pc_relative */ + 0, /* bitpos */ + complain_overflow_bitfield,/* complain_on_overflow */ + bfd_elf_generic_reloc, /* special_function */ + "R_CRX_REL8_CMP", /* name */ + FALSE, /* partial_inplace */ + 0x0, /* src_mask */ + 0xff, /* dst_mask */ + FALSE), /* pcrel_offset */ + + HOWTO (R_CRX_REL16, /* type */ + 1, /* rightshift */ + 1, /* size */ + 16, /* bitsize */ + TRUE, /* pc_relative */ + 0, /* bitpos */ + complain_overflow_bitfield,/* complain_on_overflow */ + bfd_elf_generic_reloc, /* special_function */ + "R_CRX_REL16", /* name */ + FALSE, /* partial_inplace */ + 0x0, /* src_mask */ + 0xffff, /* dst_mask */ + FALSE), /* pcrel_offset */ + + HOWTO (R_CRX_REL24, /* type */ + 1, /* rightshift */ + 2, /* size */ + 24, /* bitsize */ + TRUE, /* pc_relative */ + 0, /* bitpos */ + complain_overflow_bitfield,/* complain_on_overflow */ + bfd_elf_generic_reloc, /* special_function */ + "R_CRX_REL24", /* name */ + FALSE, /* partial_inplace */ + 0x0, /* src_mask */ + 0xffffff, /* dst_mask */ + FALSE), /* pcrel_offset */ + + HOWTO (R_CRX_REL32, /* type */ + 1, /* rightshift */ + 2, /* size */ + 32, /* bitsize */ + TRUE, /* pc_relative */ + 0, /* bitpos */ + complain_overflow_bitfield,/* complain_on_overflow */ + bfd_elf_generic_reloc, /* special_function */ + "R_CRX_REL32", /* name */ + FALSE, /* partial_inplace */ + 0x0, /* src_mask */ + 0xffffffff, /* dst_mask */ + FALSE), /* pcrel_offset */ + + HOWTO (R_CRX_REGREL12, /* type */ + 0, /* rightshift */ + 1, /* size */ + 12, /* bitsize */ + FALSE, /* pc_relative */ + 0, /* bitpos */ + complain_overflow_bitfield,/* complain_on_overflow */ + bfd_elf_generic_reloc, /* special_function */ + "R_CRX_REGREL12", /* name */ + FALSE, /* partial_inplace */ + 0x0, /* src_mask */ + 0xfff, /* dst_mask */ + FALSE), /* pcrel_offset */ + + HOWTO (R_CRX_REGREL22, /* type */ + 0, /* rightshift */ + 2, /* size */ + 22, /* bitsize */ + FALSE, /* pc_relative */ + 0, /* bitpos */ + complain_overflow_bitfield,/* complain_on_overflow */ + bfd_elf_generic_reloc, /* special_function */ + "R_CRX_REGREL22", /* name */ + FALSE, /* partial_inplace */ + 0x0, /* src_mask */ + 0x3fffff, /* dst_mask */ + FALSE), /* pcrel_offset */ + + HOWTO (R_CRX_REGREL28, /* type */ + 0, /* rightshift */ + 2, /* size */ + 28, /* bitsize */ + FALSE, /* pc_relative */ + 0, /* bitpos */ + complain_overflow_bitfield,/* complain_on_overflow */ + bfd_elf_generic_reloc, /* special_function */ + "R_CRX_REGREL28", /* name */ + FALSE, /* partial_inplace */ + 0x0, /* src_mask */ + 0xfffffff, /* dst_mask */ + FALSE), /* pcrel_offset */ + + HOWTO (R_CRX_REGREL32, /* type */ + 0, /* rightshift */ + 2, /* size */ + 32, /* bitsize */ + FALSE, /* pc_relative */ + 0, /* bitpos */ + complain_overflow_bitfield,/* complain_on_overflow */ + bfd_elf_generic_reloc, /* special_function */ + "R_CRX_REGREL32", /* name */ + FALSE, /* partial_inplace */ + 0x0, /* src_mask */ + 0xffffffff, /* dst_mask */ + FALSE), /* pcrel_offset */ + + HOWTO (R_CRX_ABS16, /* type */ + 0, /* rightshift */ + 1, /* size */ + 16, /* bitsize */ + FALSE, /* pc_relative */ + 0, /* bitpos */ + complain_overflow_bitfield,/* complain_on_overflow */ + bfd_elf_generic_reloc, /* special_function */ + "R_CRX_ABS16", /* name */ + FALSE, /* partial_inplace */ + 0x0, /* src_mask */ + 0xffff, /* dst_mask */ + FALSE), /* pcrel_offset */ + + HOWTO (R_CRX_ABS32, /* type */ + 0, /* rightshift */ + 2, /* size */ + 32, /* bitsize */ + FALSE, /* pc_relative */ + 0, /* bitpos */ + complain_overflow_bitfield,/* complain_on_overflow */ + bfd_elf_generic_reloc, /* special_function */ + "R_CRX_ABS32", /* name */ + FALSE, /* partial_inplace */ + 0x0, /* src_mask */ + 0xffffffff, /* dst_mask */ + FALSE), /* pcrel_offset */ + + HOWTO (R_CRX_NUM8, /* type */ + 0, /* rightshift */ + 0, /* size */ + 8, /* bitsize */ + FALSE, /* pc_relative */ + 0, /* bitpos */ + complain_overflow_bitfield,/* complain_on_overflow */ + bfd_elf_generic_reloc, /* special_function */ + "R_CRX_NUM8", /* name */ + FALSE, /* partial_inplace */ + 0x0, /* src_mask */ + 0xff, /* dst_mask */ + FALSE), /* pcrel_offset */ + + HOWTO (R_CRX_NUM16, /* type */ + 0, /* rightshift */ + 1, /* size */ + 16, /* bitsize */ + FALSE, /* pc_relative */ + 0, /* bitpos */ + complain_overflow_bitfield,/* complain_on_overflow */ + bfd_elf_generic_reloc, /* special_function */ + "R_CRX_NUM16", /* name */ + FALSE, /* partial_inplace */ + 0x0, /* src_mask */ + 0xffff, /* dst_mask */ + FALSE), /* pcrel_offset */ + + HOWTO (R_CRX_NUM32, /* type */ + 0, /* rightshift */ + 2, /* size */ + 32, /* bitsize */ + FALSE, /* pc_relative */ + 0, /* bitpos */ + complain_overflow_bitfield,/* complain_on_overflow */ + bfd_elf_generic_reloc, /* special_function */ + "R_CRX_NUM32", /* name */ + FALSE, /* partial_inplace */ + 0x0, /* src_mask */ + 0xffffffff, /* dst_mask */ + FALSE), /* pcrel_offset */ + + HOWTO (R_CRX_IMM16, /* type */ + 0, /* rightshift */ + 1, /* size */ + 16, /* bitsize */ + FALSE, /* pc_relative */ + 0, /* bitpos */ + complain_overflow_bitfield,/* complain_on_overflow */ + bfd_elf_generic_reloc, /* special_function */ + "R_CRX_IMM16", /* name */ + FALSE, /* partial_inplace */ + 0x0, /* src_mask */ + 0xffff, /* dst_mask */ + FALSE), /* pcrel_offset */ + + HOWTO (R_CRX_IMM32, /* type */ + 0, /* rightshift */ + 2, /* size */ + 32, /* bitsize */ + FALSE, /* pc_relative */ + 0, /* bitpos */ + complain_overflow_bitfield,/* complain_on_overflow */ + bfd_elf_generic_reloc, /* special_function */ + "R_CRX_IMM32", /* name */ + FALSE, /* partial_inplace */ + 0x0, /* src_mask */ + 0xffffffff, /* dst_mask */ + FALSE), /* pcrel_offset */ + + /* An 8 bit switch table entry. This is generated for an expression + such as ``.byte L1 - L2''. The offset holds the difference + between the reloc address and L2. */ + HOWTO (R_CRX_SWITCH8, /* type */ + 0, /* rightshift */ + 0, /* size (0 = byte, 1 = short, 2 = long) */ + 8, /* bitsize */ + FALSE, /* pc_relative */ + 0, /* bitpos */ + complain_overflow_unsigned, /* complain_on_overflow */ + bfd_elf_generic_reloc, /* special_function */ + "R_CRX_SWITCH8", /* name */ + FALSE, /* partial_inplace */ + 0x0, /* src_mask */ + 0xff, /* dst_mask */ + TRUE), /* pcrel_offset */ + + /* A 16 bit switch table entry. This is generated for an expression + such as ``.word L1 - L2''. The offset holds the difference + between the reloc address and L2. */ + HOWTO (R_CRX_SWITCH16, /* type */ + 0, /* rightshift */ + 1, /* size (0 = byte, 1 = short, 2 = long) */ + 16, /* bitsize */ + FALSE, /* pc_relative */ + 0, /* bitpos */ + complain_overflow_unsigned, /* complain_on_overflow */ + bfd_elf_generic_reloc, /* special_function */ + "R_CRX_SWITCH16", /* name */ + FALSE, /* partial_inplace */ + 0x0, /* src_mask */ + 0xffff, /* dst_mask */ + TRUE), /* pcrel_offset */ + + /* A 32 bit switch table entry. This is generated for an expression + such as ``.long L1 - L2''. The offset holds the difference + between the reloc address and L2. */ + HOWTO (R_CRX_SWITCH32, /* type */ + 0, /* rightshift */ + 2, /* size (0 = byte, 1 = short, 2 = long) */ + 32, /* bitsize */ + FALSE, /* pc_relative */ + 0, /* bitpos */ + complain_overflow_unsigned, /* complain_on_overflow */ + bfd_elf_generic_reloc, /* special_function */ + "R_CRX_SWITCH32", /* name */ + FALSE, /* partial_inplace */ + 0x0, /* src_mask */ + 0xffffffff, /* dst_mask */ + TRUE) /* pcrel_offset */ +}; + +/* Retrieve a howto ptr using a BFD reloc_code. */ + +static reloc_howto_type * +elf_crx_reloc_type_lookup (bfd *abfd ATTRIBUTE_UNUSED, + bfd_reloc_code_real_type code) +{ + unsigned int i; + + for (i = 0; i < R_CRX_MAX; i++) + if (code == crx_reloc_map[i].bfd_reloc_enum) + return &crx_elf_howto_table[crx_reloc_map[i].crx_reloc_type]; + + printf ("This relocation Type is not supported -0x%x\n", code); + return 0; +} + +static reloc_howto_type * +elf_crx_reloc_name_lookup (bfd *abfd ATTRIBUTE_UNUSED, + const char *r_name) +{ + unsigned int i; + + for (i = 0; + i < sizeof (crx_elf_howto_table) / sizeof (crx_elf_howto_table[0]); + i++) + if (crx_elf_howto_table[i].name != NULL + && strcasecmp (crx_elf_howto_table[i].name, r_name) == 0) + return &crx_elf_howto_table[i]; + + return NULL; +} + +/* Retrieve a howto ptr using an internal relocation entry. */ + +static void +elf_crx_info_to_howto (bfd *abfd ATTRIBUTE_UNUSED, arelent *cache_ptr, + Elf_Internal_Rela *dst) +{ + unsigned int r_type = ELF32_R_TYPE (dst->r_info); + BFD_ASSERT (r_type < (unsigned int) R_CRX_MAX); + cache_ptr->howto = &crx_elf_howto_table[r_type]; +} + +/* Perform a relocation as part of a final link. */ + +static bfd_reloc_status_type +crx_elf_final_link_relocate (reloc_howto_type *howto, bfd *input_bfd, + bfd *output_bfd ATTRIBUTE_UNUSED, + asection *input_section, bfd_byte *contents, + bfd_vma offset, bfd_vma Rvalue, bfd_vma addend, + struct bfd_link_info *info ATTRIBUTE_UNUSED, + asection *sec ATTRIBUTE_UNUSED, + int is_local ATTRIBUTE_UNUSED) +{ + unsigned short r_type = howto->type; + bfd_byte *hit_data = contents + offset; + bfd_vma reloc_bits, check; + + switch (r_type) + { + case R_CRX_IMM16: + case R_CRX_IMM32: + case R_CRX_ABS16: + case R_CRX_ABS32: + case R_CRX_REL8_CMP: + case R_CRX_REL16: + case R_CRX_REL24: + case R_CRX_REL32: + case R_CRX_REGREL12: + case R_CRX_REGREL22: + case R_CRX_REGREL28: + case R_CRX_REGREL32: + /* 'hit_data' is relative to the start of the instruction, not the + relocation offset. Advance it to account for the exact offset. */ + hit_data += 2; + break; + + case R_CRX_REL4: + /* This relocation type is used only in 'Branch if Equal to 0' + instructions and requires special handling. */ + Rvalue -= 1; + break; + + case R_CRX_NONE: + return bfd_reloc_ok; + break; + + case R_CRX_SWITCH8: + case R_CRX_SWITCH16: + case R_CRX_SWITCH32: + /* We only care about the addend, where the difference between + expressions is kept. */ + Rvalue = 0; + + default: + break; + } + + if (howto->pc_relative) + { + /* Subtract the address of the section containing the location. */ + Rvalue -= (input_section->output_section->vma + + input_section->output_offset); + /* Subtract the position of the location within the section. */ + Rvalue -= offset; + } + + /* Add in supplied addend. */ + Rvalue += addend; + + /* Complain if the bitfield overflows, whether it is considered + as signed or unsigned. */ + check = Rvalue >> howto->rightshift; + + /* Assumes two's complement. This expression avoids + overflow if howto->bitsize is the number of bits in + bfd_vma. */ + reloc_bits = (((1 << (howto->bitsize - 1)) - 1) << 1) | 1; + + if (((bfd_vma) check & ~reloc_bits) != 0 + && (((bfd_vma) check & ~reloc_bits) + != (-(bfd_vma) 1 & ~reloc_bits))) + { + /* The above right shift is incorrect for a signed + value. See if turning on the upper bits fixes the + overflow. */ + if (howto->rightshift && (bfd_signed_vma) Rvalue < 0) + { + check |= ((bfd_vma) - 1 + & ~((bfd_vma) - 1 + >> howto->rightshift)); + if (((bfd_vma) check & ~reloc_bits) + != (-(bfd_vma) 1 & ~reloc_bits)) + return bfd_reloc_overflow; + } + else + return bfd_reloc_overflow; + } + + /* Drop unwanted bits from the value we are relocating to. */ + Rvalue >>= (bfd_vma) howto->rightshift; + + /* Apply dst_mask to select only relocatable part of the insn. */ + Rvalue &= howto->dst_mask; + + switch (howto->size) + { + case 0: + if (r_type == R_CRX_REL4) + { + Rvalue <<= 4; + Rvalue |= (bfd_get_8 (input_bfd, hit_data) & 0x0f); + } + + bfd_put_8 (input_bfd, (unsigned char) Rvalue, hit_data); + break; + + case 1: + if (r_type == R_CRX_REGREL12) + Rvalue |= (bfd_get_16 (input_bfd, hit_data) & 0xf000); + + bfd_put_16 (input_bfd, Rvalue, hit_data); + break; + + case 2: + if (r_type == R_CRX_REL24 + || r_type == R_CRX_REGREL22 + || r_type == R_CRX_REGREL28) + Rvalue |= (((bfd_get_16 (input_bfd, hit_data) << 16) | + bfd_get_16 (input_bfd, hit_data + 2)) & ~howto->dst_mask); + + if (r_type == R_CRX_NUM32 || r_type == R_CRX_SWITCH32) + /* Relocation on DATA is purely little-endian, that is, for a + multi-byte datum, the lowest address in memory contains the + little end of the datum, that is, the least significant byte. + Therefore we use BFD's byte Putting functions. */ + bfd_put_32 (input_bfd, Rvalue, hit_data); + else + /* Relocation on INSTRUCTIONS is different : Instructions are + word-addressable, that is, each word itself is arranged according + to little-endian convention, whereas the words are arranged with + respect to one another in BIG ENDIAN fashion. + When there is an immediate value that spans a word boundary, it is + split in a big-endian way with respect to the words. */ + { + bfd_put_16 (input_bfd, (Rvalue >> 16) & 0xffff, hit_data); + bfd_put_16 (input_bfd, Rvalue & 0xffff, hit_data + 2); + } + break; + + default: + return bfd_reloc_notsupported; + } + + return bfd_reloc_ok; +} + +/* Delete some bytes from a section while relaxing. */ + +static bfd_boolean +elf32_crx_relax_delete_bytes (struct bfd_link_info *link_info, bfd *abfd, + asection *sec, bfd_vma addr, int count) +{ + Elf_Internal_Shdr *symtab_hdr; + unsigned int sec_shndx; + bfd_byte *contents; + Elf_Internal_Rela *irel, *irelend; + bfd_vma toaddr; + Elf_Internal_Sym *isym; + Elf_Internal_Sym *isymend; + struct elf_link_hash_entry **sym_hashes; + struct elf_link_hash_entry **end_hashes; + struct elf_link_hash_entry **start_hashes; + unsigned int symcount; + + sec_shndx = _bfd_elf_section_from_bfd_section (abfd, sec); + + contents = elf_section_data (sec)->this_hdr.contents; + + toaddr = sec->size; + + 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)); + sec->size -= 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)) + 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; + for (isymend = isym + symtab_hdr->sh_info; isym < isymend; isym++) + { + if (isym->st_shndx == sec_shndx + && isym->st_value > addr + && isym->st_value < toaddr) + { + /* Adjust the addend of SWITCH relocations in this section, + which reference this local symbol. */ + for (irel = elf_section_data (sec)->relocs; irel < irelend; irel++) + { + unsigned long r_symndx; + Elf_Internal_Sym *rsym; + bfd_vma addsym, subsym; + + /* Skip if not a SWITCH relocation. */ + if (ELF32_R_TYPE (irel->r_info) != (int) R_CRX_SWITCH8 + && ELF32_R_TYPE (irel->r_info) != (int) R_CRX_SWITCH16 + && ELF32_R_TYPE (irel->r_info) != (int) R_CRX_SWITCH32) + continue; + + r_symndx = ELF32_R_SYM (irel->r_info); + rsym = (Elf_Internal_Sym *) symtab_hdr->contents + r_symndx; + + /* Skip if not the local adjusted symbol. */ + if (rsym != isym) + continue; + + addsym = isym->st_value; + subsym = addsym - irel->r_addend; + + /* Fix the addend only when -->> (addsym > addr >= subsym). */ + if (subsym <= addr) + irel->r_addend -= count; + else + continue; + } + + isym->st_value -= 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 = start_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; + + /* The '--wrap SYMBOL' option is causing a pain when the object file, + containing the definition of __wrap_SYMBOL, includes a direct + call to SYMBOL as well. Since both __wrap_SYMBOL and SYMBOL reference + the same symbol (which is __wrap_SYMBOL), but still exist as two + different symbols in 'sym_hashes', we don't want to adjust + the global symbol __wrap_SYMBOL twice. + This check is only relevant when symbols are being wrapped. */ + if (link_info->wrap_hash != NULL) + { + struct elf_link_hash_entry **cur_sym_hashes; + + /* Loop only over the symbols whom been already checked. */ + for (cur_sym_hashes = start_hashes; cur_sym_hashes < sym_hashes; + cur_sym_hashes++) + { + /* If the current symbol is identical to 'sym_hash', that means + the symbol was already adjusted (or at least checked). */ + if (*cur_sym_hashes == sym_hash) + break; + } + /* Don't adjust the symbol again. */ + if (cur_sym_hashes < sym_hashes) + continue; + } + + if ((sym_hash->root.type == bfd_link_hash_defined + || sym_hash->root.type == bfd_link_hash_defweak) + && sym_hash->root.u.def.section == sec + && sym_hash->root.u.def.value > addr + && sym_hash->root.u.def.value < toaddr) + sym_hash->root.u.def.value -= count; + } + + return TRUE; +} + +/* This is a version of bfd_generic_get_relocated_section_contents + which uses elf32_crx_relocate_section. */ + +static bfd_byte * +elf32_crx_get_relocated_section_contents (bfd *output_bfd, + struct bfd_link_info *link_info, + struct bfd_link_order *link_order, + bfd_byte *data, + bfd_boolean relocatable, + asymbol **symbols) +{ + Elf_Internal_Shdr *symtab_hdr; + asection *input_section = link_order->u.indirect.section; + bfd *input_bfd = input_section->owner; + asection **sections = NULL; + Elf_Internal_Rela *internal_relocs = NULL; + Elf_Internal_Sym *isymbuf = NULL; + + /* We only need to handle the case of relaxing, or of having a + particular set of section contents, specially. */ + if (relocatable + || elf_section_data (input_section)->this_hdr.contents == NULL) + return bfd_generic_get_relocated_section_contents (output_bfd, link_info, + link_order, data, + relocatable, + symbols); + + symtab_hdr = &elf_tdata (input_bfd)->symtab_hdr; + + memcpy (data, elf_section_data (input_section)->this_hdr.contents, + (size_t) input_section->size); + + if ((input_section->flags & SEC_RELOC) != 0 + && input_section->reloc_count > 0) + { + Elf_Internal_Sym *isym; + Elf_Internal_Sym *isymend; + asection **secpp; + bfd_size_type amt; + + internal_relocs = (_bfd_elf_link_read_relocs + (input_bfd, input_section, NULL, + (Elf_Internal_Rela *) NULL, FALSE)); + if (internal_relocs == NULL) + goto error_return; + + if (symtab_hdr->sh_info != 0) + { + isymbuf = (Elf_Internal_Sym *) symtab_hdr->contents; + if (isymbuf == NULL) + isymbuf = bfd_elf_get_elf_syms (input_bfd, symtab_hdr, + symtab_hdr->sh_info, 0, + NULL, NULL, NULL); + if (isymbuf == NULL) + goto error_return; + } + + amt = symtab_hdr->sh_info; + amt *= sizeof (asection *); + sections = bfd_malloc (amt); + if (sections == NULL && amt != 0) + goto error_return; + + isymend = isymbuf + symtab_hdr->sh_info; + for (isym = isymbuf, secpp = sections; isym < isymend; ++isym, ++secpp) + { + asection *isec; + + if (isym->st_shndx == SHN_UNDEF) + isec = bfd_und_section_ptr; + else if (isym->st_shndx == SHN_ABS) + isec = bfd_abs_section_ptr; + else if (isym->st_shndx == SHN_COMMON) + isec = bfd_com_section_ptr; + else + isec = bfd_section_from_elf_index (input_bfd, isym->st_shndx); + + *secpp = isec; + } + + if (! elf32_crx_relocate_section (output_bfd, link_info, input_bfd, + input_section, data, internal_relocs, + isymbuf, sections)) + goto error_return; + + if (sections != NULL) + free (sections); + if (isymbuf != NULL + && symtab_hdr->contents != (unsigned char *) isymbuf) + free (isymbuf); + if (elf_section_data (input_section)->relocs != internal_relocs) + free (internal_relocs); + } + + return data; + + error_return: + if (sections != NULL) + free (sections); + if (isymbuf != NULL + && symtab_hdr->contents != (unsigned char *) isymbuf) + free (isymbuf); + if (internal_relocs != NULL + && elf_section_data (input_section)->relocs != internal_relocs) + free (internal_relocs); + return NULL; +} + +/* Relocate a CRX ELF section. */ + +static bfd_boolean +elf32_crx_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, *relend; + + symtab_hdr = &elf_tdata (input_bfd)->symtab_hdr; + sym_hashes = elf_sym_hashes (input_bfd); + + rel = relocs; + relend = relocs + input_section->reloc_count; + for (; rel < relend; rel++) + { + int r_type; + 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; + + r_symndx = ELF32_R_SYM (rel->r_info); + r_type = ELF32_R_TYPE (rel->r_info); + howto = crx_elf_howto_table + (r_type); + + h = NULL; + sym = NULL; + sec = NULL; + 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); + } + else + { + bfd_boolean unresolved_reloc, warned; + + RELOC_FOR_GLOBAL_SYMBOL (info, input_bfd, input_section, rel, + r_symndx, symtab_hdr, sym_hashes, + h, sec, relocation, + unresolved_reloc, warned); + } + + if (sec != NULL && discarded_section (sec)) + RELOC_AGAINST_DISCARDED_SECTION (info, input_bfd, input_section, + rel, 1, relend, howto, 0, contents); + + if (info->relocatable) + continue; + + r = crx_elf_final_link_relocate (howto, input_bfd, output_bfd, + input_section, + contents, rel->r_offset, + relocation, rel->r_addend, + info, sec, h == NULL); + + if (r != bfd_reloc_ok) + { + const char *name; + const char *msg = (const char *) 0; + + if (h != NULL) + name = h->root.root.string; + else + { + name = (bfd_elf_string_from_elf_section + (input_bfd, symtab_hdr->sh_link, sym->st_name)); + if (name == NULL || *name == '\0') + name = bfd_section_name (input_bfd, sec); + } + + switch (r) + { + case bfd_reloc_overflow: + if (!((*info->callbacks->reloc_overflow) + (info, (h ? &h->root : NULL), name, howto->name, + (bfd_vma) 0, input_bfd, input_section, + rel->r_offset))) + return FALSE; + break; + + case bfd_reloc_undefined: + if (!((*info->callbacks->undefined_symbol) + (info, name, input_bfd, input_section, + rel->r_offset, TRUE))) + return FALSE; + break; + + case bfd_reloc_outofrange: + msg = _("internal error: out of range error"); + goto common_error; + + case bfd_reloc_notsupported: + msg = _("internal error: unsupported relocation error"); + goto common_error; + + case bfd_reloc_dangerous: + msg = _("internal error: dangerous error"); + goto common_error; + + default: + msg = _("internal error: unknown error"); + /* Fall through. */ + + common_error: + if (!((*info->callbacks->warning) + (info, msg, name, input_bfd, input_section, + rel->r_offset))) + return FALSE; + break; + } + } + } + + return TRUE; +} + +/* This function handles relaxing for the CRX. + + There's quite a few relaxing opportunites available on the CRX: + + * bal/bcond:32 -> bal/bcond:16 2 bytes + * bcond:16 -> bcond:8 2 bytes + * cmpbcond:24 -> cmpbcond:8 2 bytes + * arithmetic imm32 -> arithmetic imm16 2 bytes + + Symbol- and reloc-reading infrastructure copied from elf-m10200.c. */ + +static bfd_boolean +elf32_crx_relax_section (bfd *abfd, asection *sec, + struct bfd_link_info *link_info, bfd_boolean *again) +{ + Elf_Internal_Shdr *symtab_hdr; + Elf_Internal_Rela *internal_relocs; + Elf_Internal_Rela *irel, *irelend; + bfd_byte *contents = NULL; + Elf_Internal_Sym *isymbuf = NULL; + + /* 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; + + /* Get a copy of the native relocations. */ + internal_relocs = (_bfd_elf_link_read_relocs + (abfd, sec, NULL, (Elf_Internal_Rela *) NULL, + link_info->keep_memory)); + if (internal_relocs == NULL) + goto error_return; + + /* Walk through them looking for relaxing opportunities. */ + irelend = internal_relocs + sec->reloc_count; + for (irel = internal_relocs; irel < irelend; irel++) + { + bfd_vma symval; + + /* If this isn't something that can be relaxed, then ignore + this reloc. */ + if (ELF32_R_TYPE (irel->r_info) != (int) R_CRX_REL32 + && ELF32_R_TYPE (irel->r_info) != (int) R_CRX_REL16 + && ELF32_R_TYPE (irel->r_info) != (int) R_CRX_REL24 + && ELF32_R_TYPE (irel->r_info) != (int) R_CRX_IMM32) + continue; + + /* Get the section contents if we haven't done so already. */ + if (contents == NULL) + { + /* Get cached copy if it exists. */ + 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; + } + + /* Read this BFD's local symbols if we haven't done so already. */ + if (isymbuf == NULL && symtab_hdr->sh_info != 0) + { + isymbuf = (Elf_Internal_Sym *) symtab_hdr->contents; + if (isymbuf == NULL) + isymbuf = bfd_elf_get_elf_syms (abfd, symtab_hdr, + symtab_hdr->sh_info, 0, + NULL, NULL, NULL); + if (isymbuf == NULL) + goto error_return; + } + + /* Get the value of the symbol referred to by the reloc. */ + if (ELF32_R_SYM (irel->r_info) < symtab_hdr->sh_info) + { + /* A local symbol. */ + Elf_Internal_Sym *isym; + asection *sym_sec; + + isym = isymbuf + ELF32_R_SYM (irel->r_info); + if (isym->st_shndx == SHN_UNDEF) + sym_sec = bfd_und_section_ptr; + else if (isym->st_shndx == SHN_ABS) + sym_sec = bfd_abs_section_ptr; + else if (isym->st_shndx == SHN_COMMON) + sym_sec = bfd_com_section_ptr; + else + sym_sec = bfd_section_from_elf_index (abfd, isym->st_shndx); + symval = (isym->st_value + + sym_sec->output_section->vma + + sym_sec->output_offset); + } + else + { + unsigned long indx; + struct elf_link_hash_entry *h; + + /* An external symbol. */ + indx = ELF32_R_SYM (irel->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. */ + continue; + + symval = (h->root.u.def.value + + h->root.u.def.section->output_section->vma + + h->root.u.def.section->output_offset); + } + + /* For simplicity of coding, we are going to modify the section + contents, the section relocs, and the BFD symbol table. We + must tell the rest of the code not to free up this + information. It would be possible to instead create a table + of changes which have to be made, as is done in coff-mips.c; + that would be more work, but would require less memory when + the linker is run. */ + + /* Try to turn a 32bit pc-relative branch/call into + a 16bit pc-relative branch/call. */ + if (ELF32_R_TYPE (irel->r_info) == (int) R_CRX_REL32) + { + bfd_vma value = symval; + + /* Deal with pc-relative gunk. */ + value -= (sec->output_section->vma + sec->output_offset); + value -= irel->r_offset; + value += irel->r_addend; + + /* See if the value will fit in 16 bits, note the high value is + 0xfffe + 2 as the target will be two bytes closer if we are + able to relax. */ + if ((long) value < 0x10000 && (long) value > -0x10002) + { + unsigned short code; + + /* Get the opcode. */ + code = (unsigned short) bfd_get_16 (abfd, contents + irel->r_offset); + + /* Verify it's a 'bal'/'bcond' and fix the opcode. */ + if ((code & 0xfff0) == 0x3170) + bfd_put_8 (abfd, 0x30, contents + irel->r_offset + 1); + else if ((code & 0xf0ff) == 0x707f) + bfd_put_8 (abfd, 0x7e, contents + irel->r_offset); + else + continue; + + /* Note that we've changed the relocs, section contents, etc. */ + elf_section_data (sec)->relocs = internal_relocs; + elf_section_data (sec)->this_hdr.contents = contents; + symtab_hdr->contents = (unsigned char *) isymbuf; + + /* Fix the relocation's type. */ + irel->r_info = ELF32_R_INFO (ELF32_R_SYM (irel->r_info), + R_CRX_REL16); + + /* Delete two bytes of data. */ + if (!elf32_crx_relax_delete_bytes (link_info, abfd, sec, + irel->r_offset + 2, 2)) + goto error_return; + + /* That will change things, so, we should relax again. + Note that this is not required, and it may be slow. */ + *again = TRUE; + } + } + + /* Try to turn a 16bit pc-relative branch into an + 8bit pc-relative branch. */ + if (ELF32_R_TYPE (irel->r_info) == (int) R_CRX_REL16) + { + bfd_vma value = symval; + + /* Deal with pc-relative gunk. */ + value -= (sec->output_section->vma + sec->output_offset); + value -= irel->r_offset; + value += irel->r_addend; + + /* See if the value will fit in 8 bits, note the high value is + 0xfc + 2 as the target will be two bytes closer if we are + able to relax. */ + if ((long) value < 0xfe && (long) value > -0x100) + { + unsigned short code; + + /* Get the opcode. */ + code = (unsigned short) bfd_get_16 (abfd, contents + irel->r_offset); + + /* Verify it's a 'bcond' opcode. */ + if ((code & 0xf0ff) != 0x707e) + continue; + + /* Note that we've changed the relocs, section contents, etc. */ + elf_section_data (sec)->relocs = internal_relocs; + elf_section_data (sec)->this_hdr.contents = contents; + symtab_hdr->contents = (unsigned char *) isymbuf; + + /* Fix the relocation's type. */ + irel->r_info = ELF32_R_INFO (ELF32_R_SYM (irel->r_info), + R_CRX_REL8); + + /* Delete two bytes of data. */ + if (!elf32_crx_relax_delete_bytes (link_info, abfd, sec, + irel->r_offset + 2, 2)) + goto error_return; + + /* That will change things, so, we should relax again. + Note that this is not required, and it may be slow. */ + *again = TRUE; + } + } + + /* Try to turn a 24bit pc-relative cmp&branch into + an 8bit pc-relative cmp&branch. */ + if (ELF32_R_TYPE (irel->r_info) == (int) R_CRX_REL24) + { + bfd_vma value = symval; + + /* Deal with pc-relative gunk. */ + value -= (sec->output_section->vma + sec->output_offset); + value -= irel->r_offset; + value += irel->r_addend; + + /* See if the value will fit in 8 bits, note the high value is + 0x7e + 2 as the target will be two bytes closer if we are + able to relax. */ + if ((long) value < 0x100 && (long) value > -0x100) + { + unsigned short code; + + /* Get the opcode. */ + code = (unsigned short) bfd_get_16 (abfd, contents + irel->r_offset); + + /* Verify it's a 'cmp&branch' opcode. */ + if ((code & 0xfff0) != 0x3180 && (code & 0xfff0) != 0x3190 + && (code & 0xfff0) != 0x31a0 && (code & 0xfff0) != 0x31c0 + && (code & 0xfff0) != 0x31d0 && (code & 0xfff0) != 0x31e0 + /* Or a Co-processor branch ('bcop'). */ + && (code & 0xfff0) != 0x3010 && (code & 0xfff0) != 0x3110) + continue; + + /* Note that we've changed the relocs, section contents, etc. */ + elf_section_data (sec)->relocs = internal_relocs; + elf_section_data (sec)->this_hdr.contents = contents; + symtab_hdr->contents = (unsigned char *) isymbuf; + + /* Fix the opcode. */ + bfd_put_8 (abfd, 0x30, contents + irel->r_offset + 1); + + /* Fix the relocation's type. */ + irel->r_info = ELF32_R_INFO (ELF32_R_SYM (irel->r_info), + R_CRX_REL8_CMP); + + /* Delete two bytes of data. */ + if (!elf32_crx_relax_delete_bytes (link_info, abfd, sec, + irel->r_offset + 4, 2)) + goto error_return; + + /* That will change things, so, we should relax again. + Note that this is not required, and it may be slow. */ + *again = TRUE; + } + } + + /* Try to turn a 32bit immediate address into + a 16bit immediate address. */ + if (ELF32_R_TYPE (irel->r_info) == (int) R_CRX_IMM32) + { + bfd_vma value = symval; + + /* See if the value will fit in 16 bits. */ + if ((long) value < 0x7fff && (long) value > -0x8000) + { + unsigned short code; + + /* Get the opcode. */ + code = (unsigned short) bfd_get_16 (abfd, contents + irel->r_offset); + + /* Verify it's a 'arithmetic double'. */ + if ((code & 0xf0f0) != 0x20f0) + continue; + + /* Note that we've changed the relocs, section contents, etc. */ + elf_section_data (sec)->relocs = internal_relocs; + elf_section_data (sec)->this_hdr.contents = contents; + symtab_hdr->contents = (unsigned char *) isymbuf; + + /* Fix the opcode. */ + bfd_put_8 (abfd, (code & 0xff) - 0x10, contents + irel->r_offset); + + /* Fix the relocation's type. */ + irel->r_info = ELF32_R_INFO (ELF32_R_SYM (irel->r_info), + R_CRX_IMM16); + + /* Delete two bytes of data. */ + if (!elf32_crx_relax_delete_bytes (link_info, abfd, sec, + irel->r_offset + 2, 2)) + goto error_return; + + /* That will change things, so, we should relax again. + Note that this is not required, and it may be slow. */ + *again = TRUE; + } + } + } + + if (isymbuf != NULL + && symtab_hdr->contents != (unsigned char *) isymbuf) + { + if (! link_info->keep_memory) + free (isymbuf); + else + { + /* Cache the symbols for elf_link_input_bfd. */ + symtab_hdr->contents = (unsigned char *) isymbuf; + } + } + + if (contents != NULL + && elf_section_data (sec)->this_hdr.contents != contents) + { + if (! link_info->keep_memory) + free (contents); + else + { + /* Cache the section contents for elf_link_input_bfd. */ + elf_section_data (sec)->this_hdr.contents = contents; + } + } + + if (internal_relocs != NULL + && elf_section_data (sec)->relocs != internal_relocs) + free (internal_relocs); + + return TRUE; + + error_return: + if (isymbuf != NULL + && symtab_hdr->contents != (unsigned char *) isymbuf) + free (isymbuf); + if (contents != NULL + && elf_section_data (sec)->this_hdr.contents != contents) + free (contents); + if (internal_relocs != NULL + && elf_section_data (sec)->relocs != internal_relocs) + free (internal_relocs); + + return FALSE; +} + +/* Definitions for setting CRX target vector. */ +#define TARGET_LITTLE_SYM bfd_elf32_crx_vec +#define TARGET_LITTLE_NAME "elf32-crx" +#define ELF_ARCH bfd_arch_crx +#define ELF_MACHINE_CODE EM_CRX +#define ELF_MAXPAGESIZE 0x1 +#define elf_symbol_leading_char '_' + +#define bfd_elf32_bfd_reloc_type_lookup elf_crx_reloc_type_lookup +#define bfd_elf32_bfd_reloc_name_lookup \ + elf_crx_reloc_name_lookup +#define elf_info_to_howto elf_crx_info_to_howto +#define elf_info_to_howto_rel 0 +#define elf_backend_relocate_section elf32_crx_relocate_section +#define bfd_elf32_bfd_relax_section elf32_crx_relax_section +#define bfd_elf32_bfd_get_relocated_section_contents \ + elf32_crx_get_relocated_section_contents +#define elf_backend_can_gc_sections 1 +#define elf_backend_rela_normal 1 + +#include "elf32-target.h" |