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02a866936d
This patch adds support for the R_386_GOT32X relocation proposed in https://groups.google.com/forum/#!topic/ia32-abi/GbJJskkid4I to gas and ld. It updates gas to generate R_386_GOT32X relocation for memory operand, foo@GOT[(%reg)]. We must encode "mov foo@GOT, %eax" with the 0x8b opcode, instead of the 0xb8 opcode, so that it can be transformed to "lea foo, %eax". With the locally defined symbol, foo, we convert mov foo@GOT[(%reg1)], %reg2 to lea foo[@GOTOFF(%reg1)], %reg2 and convert call/jmp *foo@GOT[(%reg)] to nop call foo/jmp foo nop When PIC is false, convert test %reg1, foo@GOT[(%reg2)] to test $foo, %reg1 and convert binop foo@GOT[(%reg1)], %reg2 to binop $foo, %reg2 where binop is one of adc, add, and, cmp, or, sbb, sub, xor instructions. bfd/ * elf32-i386.c: Include opcode/i386.h. (elf_howto_table): Add R_386_GOT32X. (R_386_ext2): Replace R_386_IRELATIVE with R_386_GOT32X. (elf_i386_reloc_type_lookup): Handle BFD_RELOC_386_GOT32X. (need_convert_mov_to_lea): Renamed to ... (need_convert_load): This. (elf_i386_check_relocs): Handle R_386_GOT32X. Replace need_convert_mov_to_lea with need_convert_load. (elf_i386_gc_sweep_hook): Handle R_386_GOT32X. (elf_i386_size_dynamic_sections): Likewise. (elf_i386_relocate_section): Likewise. (elf_i386_convert_mov_to_lea): Renamed to ... (elf_i386_convert_load): This. Replace need_convert_mov_to_lea with need_convert_load. Support R_386_GOT32X transformations. * reloc.c (BFD_RELOC_386_GOT32X): New. * bfd-in2.h: Regenerated. * libbfd.h: Likewise. gas/ * config/tc-i386.c (tc_i386_fix_adjustable): Handle BFD_RELOC_386_GOT32X. (tc_gen_reloc): Likewise. (match_template): Force 0x8b encoding for "mov foo@GOT, %eax". (output_disp): Check for "call/jmp *mem", "mov mem, %reg", "test %reg, mem" and "binop mem, %reg" where binop is one of adc, add, and, cmp, or, sbb, sub, xor instructions. Set fx_tcbit if the REX prefix is generated. Set fx_tcbit2 if BFD_RELOC_386_GOT32X should be generated. (i386_validate_fix): Generate BFD_RELOC_386_GOT32X if fx_tcbit2 is set. gas/testsuite/ * gas/i386/got.d: New file. * gas/i386/got.s: Likewise. * gas/i386/i386.exp: Run got. * gas/i386/localpic.d: Replace R_386_GOT32 with R_386_GOT32X. * gas/i386/mixed-mode-reloc32.d: Likewise. * gas/i386/reloc32.d: Likewise. include/elf/ * i386.h (R_386_GOT32X): New relocation. ld/testsuite/ * ld-i386/branch1.d: New file. * ld-i386/branch1.s: Likewise. * ld-i386/call1.d: Likewise. * ld-i386/call1.s: Likewise. * ld-i386/call2.d: Likewise. * ld-i386/call2.s: Likewise. * ld-i386/got1.dd: Likewise. * ld-i386/got1.out: Likewise. * ld-i386/got1a.S: Likewise. * ld-i386/got1b.c: Likewise. * ld-i386/got1c.c: Likewise. * ld-i386/got1d.S: Likewise. * ld-i386/jmp1.d: Likewise. * ld-i386/jmp1.s: Likewise. * ld-i386/jmp2.d: Likewise. * ld-i386/jmp2.s: Likewise. * ld-i386/load1.d: Likewise. * ld-i386/load1.s: Likewise. * ld-i386/load2.d: Likewise. * ld-i386/load2.s: Likewise. * ld-i386/load3.d: Likewise. * ld-i386/load3.s: Likewise. * ld-i386/load4.s: Likewise. * ld-i386/load4a.d: Likewise. * ld-i386/load4b.d: Likewise. * ld-i386/load5.s: Likewise. * ld-i386/load5a.d: Likewise. * ld-i386/load5b.d: Likewise. * ld-i386/load6.d: Likewise. * ld-i386/load6.s: Likewise. * ld-i386/i386.exp: Run branch1, call1, call2, jmp1, jmp2, load1, load2, load3, load4a, load4b, load5a, load5b and load6 tests. Run got1 test.
81 lines
3.4 KiB
C
81 lines
3.4 KiB
C
/* ix86 ELF support for BFD.
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Copyright (C) 1998-2015 Free Software Foundation, Inc.
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This file is part of BFD, the Binary File Descriptor library.
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 3 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program; if not, write to the Free Software Foundation,
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Inc., 51 Franklin Street - Fifth Floor, Boston, MA 02110-1301, USA. */
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#ifndef _ELF_I386_H
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#define _ELF_I386_H
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#include "elf/reloc-macros.h"
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START_RELOC_NUMBERS (elf_i386_reloc_type)
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RELOC_NUMBER (R_386_NONE, 0) /* No reloc */
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RELOC_NUMBER (R_386_32, 1) /* Direct 32 bit */
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RELOC_NUMBER (R_386_PC32, 2) /* PC relative 32 bit */
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RELOC_NUMBER (R_386_GOT32, 3) /* 32 bit GOT entry */
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RELOC_NUMBER (R_386_PLT32, 4) /* 32 bit PLT address */
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RELOC_NUMBER (R_386_COPY, 5) /* Copy symbol at runtime */
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RELOC_NUMBER (R_386_GLOB_DAT, 6) /* Create GOT entry */
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RELOC_NUMBER (R_386_JUMP_SLOT, 7) /* Create PLT entry */
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RELOC_NUMBER (R_386_RELATIVE, 8) /* Adjust by program base */
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RELOC_NUMBER (R_386_GOTOFF, 9) /* 32 bit offset to GOT */
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RELOC_NUMBER (R_386_GOTPC, 10) /* 32 bit PC relative offset to GOT */
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RELOC_NUMBER (R_386_32PLT, 11) /* Used by Sun */
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FAKE_RELOC (FIRST_INVALID_RELOC, 12)
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FAKE_RELOC (LAST_INVALID_RELOC, 13)
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RELOC_NUMBER (R_386_TLS_TPOFF,14)
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RELOC_NUMBER (R_386_TLS_IE, 15)
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RELOC_NUMBER (R_386_TLS_GOTIE,16)
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RELOC_NUMBER (R_386_TLS_LE, 17)
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RELOC_NUMBER (R_386_TLS_GD, 18)
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RELOC_NUMBER (R_386_TLS_LDM, 19)
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RELOC_NUMBER (R_386_16, 20)
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RELOC_NUMBER (R_386_PC16, 21)
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RELOC_NUMBER (R_386_8, 22)
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RELOC_NUMBER (R_386_PC8, 23)
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RELOC_NUMBER (R_386_TLS_GD_32, 24)
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RELOC_NUMBER (R_386_TLS_GD_PUSH, 25)
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RELOC_NUMBER (R_386_TLS_GD_CALL, 26)
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RELOC_NUMBER (R_386_TLS_GD_POP, 27)
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RELOC_NUMBER (R_386_TLS_LDM_32, 28)
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RELOC_NUMBER (R_386_TLS_LDM_PUSH, 29)
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RELOC_NUMBER (R_386_TLS_LDM_CALL, 30)
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RELOC_NUMBER (R_386_TLS_LDM_POP, 31)
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RELOC_NUMBER (R_386_TLS_LDO_32, 32)
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RELOC_NUMBER (R_386_TLS_IE_32, 33)
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RELOC_NUMBER (R_386_TLS_LE_32, 34)
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RELOC_NUMBER (R_386_TLS_DTPMOD32, 35)
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RELOC_NUMBER (R_386_TLS_DTPOFF32, 36)
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RELOC_NUMBER (R_386_TLS_TPOFF32, 37)
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RELOC_NUMBER (R_386_SIZE32, 38) /* 32-bit symbol size */
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RELOC_NUMBER (R_386_TLS_GOTDESC, 39)
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RELOC_NUMBER (R_386_TLS_DESC_CALL,40)
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RELOC_NUMBER (R_386_TLS_DESC, 41)
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RELOC_NUMBER (R_386_IRELATIVE, 42) /* Adjust indirectly by program base */
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/* Load from 32 bit GOT entry, relaxable. */
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RELOC_NUMBER (R_386_GOT32X, 43)
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/* Used by Intel. */
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RELOC_NUMBER (R_386_USED_BY_INTEL_200, 200)
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/* These are GNU extensions to enable C++ vtable garbage collection. */
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RELOC_NUMBER (R_386_GNU_VTINHERIT, 250)
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RELOC_NUMBER (R_386_GNU_VTENTRY, 251)
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END_RELOC_NUMBERS (R_386_max)
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#endif
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