b264f098be
This patch adds support of the stack-based LoongArch relocations throughout GRUB, including tools, dynamic linkage, and support for conversion of ELF relocations into PE ones. A stack machine is required to handle these per the spec [1] (see the R_LARCH_SOP types), of which a simple implementation is included. These relocations are produced by binutils 2.38 and 2.39, while the newer v2.00 relocs require more recent toolchain (binutils 2.40+ & gcc 13+, or LLVM 16+). GCC 13 has not been officially released as of early 2023, so support for v1.00 relocs are expected to stay relevant for a while. [1] https://loongson.github.io/LoongArch-Documentation/LoongArch-ELF-ABI-EN.html#_relocations Signed-off-by: Zhou Yang <zhouyang@loongson.cn> Signed-off-by: Xiaotian Wu <wuxiaotian@loongson.cn> Reviewed-by: Daniel Kiper <daniel.kiper@oracle.com>
103 lines
2.9 KiB
C
103 lines
2.9 KiB
C
/*
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* GRUB -- GRand Unified Bootloader
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* Copyright (C) 2023 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/types.h>
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#include <grub/mm.h>
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#include <grub/i18n.h>
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#include <grub/cpu/reloc.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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if (e->e_ident[EI_CLASS] != ELFCLASS64
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|| e->e_ident[EI_DATA] != ELFDATA2LSB || e->e_machine != EM_LOONGARCH)
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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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/*
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* Unified function for both REL and RELA.
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*/
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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_Rel *rel, *max;
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struct grub_loongarch64_stack stack;
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grub_loongarch64_stack_init (&stack);
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for (rel = (Elf_Rel *) ((char *) ehdr + 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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Elf_Sym *sym;
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grub_uint64_t *place;
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grub_uint64_t sym_addr;
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if (rel->r_offset >= seg->size)
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return grub_error (GRUB_ERR_BAD_MODULE,
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"reloc offset is outside the segment");
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sym = (Elf_Sym *) ((char*) mod->symtab
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+ mod->symsize * ELF_R_SYM (rel->r_info));
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sym_addr = sym->st_value;
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if (s->sh_type == SHT_RELA)
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sym_addr += ((Elf_Rela *) rel)->r_addend;
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place = (grub_uint64_t *) ((grub_addr_t) seg->addr + rel->r_offset);
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switch (ELF_R_TYPE (rel->r_info))
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{
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case R_LARCH_64:
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*place = sym_addr;
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break;
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case R_LARCH_MARK_LA:
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break;
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case R_LARCH_SOP_PUSH_PCREL:
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case R_LARCH_SOP_PUSH_PLT_PCREL:
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grub_loongarch64_sop_push (&stack, sym_addr - (grub_uint64_t)place);
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break;
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GRUB_LOONGARCH64_RELOCATION (&stack, place, sym_addr)
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default:
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{
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char rel_info[17]; /* log16(2^64) = 16, plus NUL. */
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grub_snprintf (rel_info, sizeof (rel_info) - 1, "%" PRIxGRUB_UINT64_T,
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(grub_uint64_t) ELF_R_TYPE (rel->r_info));
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return grub_error (GRUB_ERR_NOT_IMPLEMENTED_YET,
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N_("relocation 0x%s is not implemented yet"), rel_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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