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151 lines
4.0 KiB
C
151 lines
4.0 KiB
C
/* dl-mips64.c - arch-dependent part of loadable module support */
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/*
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* GRUB -- GRand Unified Bootloader
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* Copyright (C) 2002,2005,2007,2009,2017 Free Software Foundation, Inc.
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*
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* GRUB 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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*
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* GRUB 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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*
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* You should have received a copy of the GNU General Public License
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* along with GRUB. If not, see <http://www.gnu.org/licenses/>.
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*/
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#include <grub/dl.h>
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#include <grub/elf.h>
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#include <grub/misc.h>
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#include <grub/err.h>
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#include <grub/cpu/types.h>
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#include <grub/mm.h>
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#include <grub/i18n.h>
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/* Check if EHDR is a valid ELF header. */
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grub_err_t
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grub_arch_dl_check_header (void *ehdr)
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{
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Elf_Ehdr *e = ehdr;
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/* Check the magic numbers. */
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#ifdef GRUB_CPU_WORDS_BIGENDIAN
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if (e->e_ident[EI_CLASS] != ELFCLASS64
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|| e->e_ident[EI_DATA] != ELFDATA2MSB
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|| e->e_machine != EM_MIPS)
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#else
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if (e->e_ident[EI_CLASS] != ELFCLASS64
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|| e->e_ident[EI_DATA] != ELFDATA2LSB
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|| e->e_machine != EM_MIPS)
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#endif
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return grub_error (GRUB_ERR_BAD_OS, N_("invalid arch-dependent ELF magic"));
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return GRUB_ERR_NONE;
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}
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#pragma GCC diagnostic ignored "-Wcast-align"
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grub_err_t
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grub_arch_dl_get_tramp_got_size (const void *ehdr __attribute__ ((unused)),
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grub_size_t *tramp, grub_size_t *got)
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{
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*tramp = 0;
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*got = 0;
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return GRUB_ERR_NONE;
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}
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/* Relocate symbols. */
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grub_err_t
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grub_arch_dl_relocate_symbols (grub_dl_t mod, void *ehdr,
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Elf_Shdr *s, grub_dl_segment_t seg)
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{
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Elf_Ehdr *e = ehdr;
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Elf_Rel *rel, *max;
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for (rel = (Elf_Rel *) ((char *) e + s->sh_offset),
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max = (Elf_Rel *) ((char *) rel + s->sh_size);
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rel < max;
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rel = (Elf_Rel *) ((char *) rel + s->sh_entsize))
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{
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grub_uint8_t *addr;
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Elf_Sym *sym;
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Elf_Addr r_info;
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grub_uint64_t sym_value;
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if (seg->size < rel->r_offset)
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return grub_error (GRUB_ERR_BAD_MODULE,
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"reloc offset is out of the segment");
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r_info = ((grub_uint64_t) rel->r_info << 32) |
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(grub_uint32_t) grub_be_to_cpu64 (rel->r_info);
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addr = (grub_uint8_t *) ((char *) seg->addr + rel->r_offset);
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sym = (Elf_Sym *) ((char *) mod->symtab
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+ mod->symsize * ELF_R_SYM (r_info));
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sym_value = sym->st_value;
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if (s->sh_type == SHT_RELA)
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{
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sym_value += ((Elf_Rela *) rel)->r_addend;
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}
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switch (ELF_R_TYPE (r_info))
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{
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case R_MIPS_64:
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*(grub_uint64_t *) addr += sym_value;
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break;
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case R_MIPS_32:
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*(grub_uint32_t *) addr += sym_value;
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break;
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case R_MIPS_26:
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{
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grub_uint32_t value;
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grub_uint32_t raw;
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raw = (*(grub_uint32_t *) addr) & 0x3ffffff;
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value = raw << 2;
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value += sym_value;
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raw = (value >> 2) & 0x3ffffff;
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*(grub_uint32_t *) addr =
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raw | ((*(grub_uint32_t *) addr) & 0xfc000000);
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}
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break;
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case R_MIPS_LO16:
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#ifdef GRUB_CPU_WORDS_BIGENDIAN
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addr += 2;
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#endif
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*(grub_uint16_t *) addr = (grub_int16_t) sym_value;
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break;
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case R_MIPS_HI16:
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#ifdef GRUB_CPU_WORDS_BIGENDIAN
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addr += 2;
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#endif
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*(grub_uint16_t *) addr = (grub_int16_t) ((sym_value + 0x8000UL) >> 16);
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break;
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case R_MIPS_HIGHER:
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#ifdef GRUB_CPU_WORDS_BIGENDIAN
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addr += 2;
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#endif
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*(grub_uint16_t *) addr = (grub_int16_t) ((sym_value + 0x80008000UL) >> 32);
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break;
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case R_MIPS_HIGHEST:
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#ifdef GRUB_CPU_WORDS_BIGENDIAN
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addr += 2;
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#endif
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*(grub_uint16_t *) addr = (grub_uint16_t) ((sym_value + 0x800080008000UL) >> 48);
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break;
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default:
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{
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return grub_error (GRUB_ERR_NOT_IMPLEMENTED_YET,
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N_("relocation 0x%x is not implemented yet"),
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ELF_R_TYPE (r_info));
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}
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break;
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}
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}
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return GRUB_ERR_NONE;
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}
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