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132 lines
3.2 KiB
132 lines
3.2 KiB
/* SPDX-License-Identifier: GPL-2.0-or-later */ |
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/* |
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* Copyright (C) 2015 Imagination Technologies |
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* Author: Alex Smith <[email protected]> |
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*/ |
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static inline bool FUNC(patch_vdso)(const char *path, void *vdso) |
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{ |
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const ELF(Ehdr) *ehdr = vdso; |
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void *shdrs; |
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ELF(Shdr) *shdr; |
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char *shstrtab, *name; |
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uint16_t sh_count, sh_entsize, i; |
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shdrs = vdso + FUNC(swap_uint)(ehdr->e_shoff); |
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sh_count = swap_uint16(ehdr->e_shnum); |
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sh_entsize = swap_uint16(ehdr->e_shentsize); |
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shdr = shdrs + (sh_entsize * swap_uint16(ehdr->e_shstrndx)); |
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shstrtab = vdso + FUNC(swap_uint)(shdr->sh_offset); |
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for (i = 0; i < sh_count; i++) { |
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shdr = shdrs + (i * sh_entsize); |
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name = shstrtab + swap_uint32(shdr->sh_name); |
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/* |
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* Ensure there are no relocation sections - ld.so does not |
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* relocate the VDSO so if there are relocations things will |
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* break. |
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*/ |
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switch (swap_uint32(shdr->sh_type)) { |
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case SHT_REL: |
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case SHT_RELA: |
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fprintf(stderr, |
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"%s: '%s' contains relocation sections\n", |
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program_name, path); |
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return false; |
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} |
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/* Check for existing sections. */ |
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if (strcmp(name, ".MIPS.abiflags") == 0) { |
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fprintf(stderr, |
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"%s: '%s' already contains a '.MIPS.abiflags' section\n", |
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program_name, path); |
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return false; |
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} |
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if (strcmp(name, ".mips_abiflags") == 0) { |
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strcpy(name, ".MIPS.abiflags"); |
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shdr->sh_type = swap_uint32(SHT_MIPS_ABIFLAGS); |
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shdr->sh_entsize = shdr->sh_size; |
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} |
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} |
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return true; |
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} |
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static inline bool FUNC(get_symbols)(const char *path, void *vdso) |
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{ |
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const ELF(Ehdr) *ehdr = vdso; |
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void *shdrs, *symtab; |
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ELF(Shdr) *shdr; |
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const ELF(Sym) *sym; |
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char *strtab, *name; |
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uint16_t sh_count, sh_entsize, st_count, st_entsize, i, j; |
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uint64_t offset; |
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uint32_t flags; |
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shdrs = vdso + FUNC(swap_uint)(ehdr->e_shoff); |
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sh_count = swap_uint16(ehdr->e_shnum); |
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sh_entsize = swap_uint16(ehdr->e_shentsize); |
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for (i = 0; i < sh_count; i++) { |
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shdr = shdrs + (i * sh_entsize); |
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if (swap_uint32(shdr->sh_type) == SHT_SYMTAB) |
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break; |
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} |
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if (i == sh_count) { |
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fprintf(stderr, "%s: '%s' has no symbol table\n", program_name, |
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path); |
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return false; |
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} |
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/* Get flags */ |
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flags = swap_uint32(ehdr->e_flags); |
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if (elf_class == ELFCLASS64) |
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elf_abi = ABI_N64; |
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else if (flags & EF_MIPS_ABI2) |
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elf_abi = ABI_N32; |
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else |
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elf_abi = ABI_O32; |
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/* Get symbol table. */ |
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symtab = vdso + FUNC(swap_uint)(shdr->sh_offset); |
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st_entsize = FUNC(swap_uint)(shdr->sh_entsize); |
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st_count = FUNC(swap_uint)(shdr->sh_size) / st_entsize; |
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/* Get string table. */ |
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shdr = shdrs + (swap_uint32(shdr->sh_link) * sh_entsize); |
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strtab = vdso + FUNC(swap_uint)(shdr->sh_offset); |
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/* Write offsets for symbols needed by the kernel. */ |
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for (i = 0; vdso_symbols[i].name; i++) { |
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if (!(vdso_symbols[i].abis & elf_abi)) |
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continue; |
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for (j = 0; j < st_count; j++) { |
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sym = symtab + (j * st_entsize); |
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name = strtab + swap_uint32(sym->st_name); |
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if (!strcmp(name, vdso_symbols[i].name)) { |
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offset = FUNC(swap_uint)(sym->st_value); |
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fprintf(out_file, |
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"\t.%s = 0x%" PRIx64 ",\n", |
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vdso_symbols[i].offset_name, offset); |
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break; |
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} |
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} |
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if (j == st_count) { |
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fprintf(stderr, |
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"%s: '%s' is missing required symbol '%s'\n", |
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program_name, path, vdso_symbols[i].name); |
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return false; |
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} |
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} |
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return true; |
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}
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