122 lines
3.3 KiB
C
122 lines
3.3 KiB
C
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/* RISC-V specific symbolic name handling.
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This file is part of elfutils.
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This file is free software; you can redistribute it and/or modify
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it under the terms of either
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* the GNU Lesser General Public License as published by the Free
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Software Foundation; either version 3 of the License, or (at
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your option) any later version
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or
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* the GNU General Public License as published by the Free
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Software Foundation; either version 2 of the License, or (at
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your option) any later version
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or both in parallel, as here.
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elfutils is distributed in the hope that it will be useful, but
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WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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General Public License for more details.
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You should have received copies of the GNU General Public License and
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the GNU Lesser General Public License along with this program. If
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not, see <http://www.gnu.org/licenses/>. */
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#ifdef HAVE_CONFIG_H
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# include <config.h>
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#endif
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#include <assert.h>
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#include <elf.h>
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#include <stddef.h>
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#include <string.h>
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#define BACKEND riscv_
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#include "libebl_CPU.h"
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/* Check for the simple reloc types. */
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Elf_Type
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riscv_reloc_simple_type (Ebl *ebl __attribute__ ((unused)), int type,
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int *addsub)
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{
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switch (type)
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{
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case R_RISCV_SET8:
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return ELF_T_BYTE;
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case R_RISCV_SET16:
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return ELF_T_HALF;
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case R_RISCV_32:
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case R_RISCV_SET32:
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return ELF_T_WORD;
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case R_RISCV_64:
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return ELF_T_XWORD;
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case R_RISCV_ADD16:
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*addsub = 1;
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return ELF_T_HALF;
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case R_RISCV_SUB16:
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*addsub = -1;
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return ELF_T_HALF;
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case R_RISCV_ADD32:
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*addsub = 1;
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return ELF_T_WORD;
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case R_RISCV_SUB32:
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*addsub = -1;
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return ELF_T_WORD;
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case R_RISCV_ADD64:
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*addsub = 1;
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return ELF_T_XWORD;
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case R_RISCV_SUB64:
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*addsub = -1;
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return ELF_T_XWORD;
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default:
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return ELF_T_NUM;
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}
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}
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/* Check whether machine flags are valid. */
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bool
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riscv_machine_flag_check (GElf_Word flags)
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{
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return ((flags &~ (EF_RISCV_RVC
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| EF_RISCV_FLOAT_ABI)) == 0);
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}
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/* Check whether given symbol's st_value and st_size are OK despite failing
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normal checks. */
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bool
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riscv_check_special_symbol (Elf *elf, const GElf_Sym *sym,
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const char *name, const GElf_Shdr *destshdr)
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{
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if (name == NULL)
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return false;
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size_t shstrndx;
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if (elf_getshdrstrndx (elf, &shstrndx) != 0)
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return false;
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const char *sname = elf_strptr (elf, shstrndx, destshdr->sh_name);
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if (sname == NULL)
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return false;
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/* _GLOBAL_OFFSET_TABLE_ points to the start of the .got section, but it
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is preceded by the .got.plt section in the output .got section. */
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if (strcmp (name, "_GLOBAL_OFFSET_TABLE_") == 0)
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return (strcmp (sname, ".got") == 0
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&& sym->st_value >= destshdr->sh_addr
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&& sym->st_value < destshdr->sh_addr + destshdr->sh_size);
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/* __global_pointer$ points to the .sdata section with an offset of
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0x800. It might however fall in the .got section, in which case we
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cannot check the offset. The size always should be zero. */
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if (strcmp (name, "__global_pointer$") == 0)
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return (((strcmp (sname, ".sdata") == 0
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&& sym->st_value == destshdr->sh_addr + 0x800)
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|| strcmp (sname, ".got") == 0)
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&& sym->st_size == 0);
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return false;
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}
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