mirror of
https://github.com/torvalds/linux.git
synced 2024-09-21 15:33:19 +00:00
2874c5fd28
Based on 1 normalized pattern(s): this program is free software you can redistribute it and or modify it under the terms of the gnu general public license as published by the free software foundation either version 2 of the license or at your option any later version extracted by the scancode license scanner the SPDX license identifier GPL-2.0-or-later has been chosen to replace the boilerplate/reference in 3029 file(s). Signed-off-by: Thomas Gleixner <tglx@linutronix.de> Reviewed-by: Allison Randal <allison@lohutok.net> Cc: linux-spdx@vger.kernel.org Link: https://lkml.kernel.org/r/20190527070032.746973796@linutronix.de Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
133 lines
3.2 KiB
C
133 lines
3.2 KiB
C
/* SPDX-License-Identifier: GPL-2.0-or-later */
|
|
/*
|
|
* Copyright (C) 2015 Imagination Technologies
|
|
* Author: Alex Smith <alex.smith@imgtec.com>
|
|
*/
|
|
|
|
static inline bool FUNC(patch_vdso)(const char *path, void *vdso)
|
|
{
|
|
const ELF(Ehdr) *ehdr = vdso;
|
|
void *shdrs;
|
|
ELF(Shdr) *shdr;
|
|
char *shstrtab, *name;
|
|
uint16_t sh_count, sh_entsize, i;
|
|
|
|
shdrs = vdso + FUNC(swap_uint)(ehdr->e_shoff);
|
|
sh_count = swap_uint16(ehdr->e_shnum);
|
|
sh_entsize = swap_uint16(ehdr->e_shentsize);
|
|
|
|
shdr = shdrs + (sh_entsize * swap_uint16(ehdr->e_shstrndx));
|
|
shstrtab = vdso + FUNC(swap_uint)(shdr->sh_offset);
|
|
|
|
for (i = 0; i < sh_count; i++) {
|
|
shdr = shdrs + (i * sh_entsize);
|
|
name = shstrtab + swap_uint32(shdr->sh_name);
|
|
|
|
/*
|
|
* Ensure there are no relocation sections - ld.so does not
|
|
* relocate the VDSO so if there are relocations things will
|
|
* break.
|
|
*/
|
|
switch (swap_uint32(shdr->sh_type)) {
|
|
case SHT_REL:
|
|
case SHT_RELA:
|
|
fprintf(stderr,
|
|
"%s: '%s' contains relocation sections\n",
|
|
program_name, path);
|
|
return false;
|
|
}
|
|
|
|
/* Check for existing sections. */
|
|
if (strcmp(name, ".MIPS.abiflags") == 0) {
|
|
fprintf(stderr,
|
|
"%s: '%s' already contains a '.MIPS.abiflags' section\n",
|
|
program_name, path);
|
|
return false;
|
|
}
|
|
|
|
if (strcmp(name, ".mips_abiflags") == 0) {
|
|
strcpy(name, ".MIPS.abiflags");
|
|
shdr->sh_type = swap_uint32(SHT_MIPS_ABIFLAGS);
|
|
shdr->sh_entsize = shdr->sh_size;
|
|
}
|
|
}
|
|
|
|
return true;
|
|
}
|
|
|
|
static inline bool FUNC(get_symbols)(const char *path, void *vdso)
|
|
{
|
|
const ELF(Ehdr) *ehdr = vdso;
|
|
void *shdrs, *symtab;
|
|
ELF(Shdr) *shdr;
|
|
const ELF(Sym) *sym;
|
|
char *strtab, *name;
|
|
uint16_t sh_count, sh_entsize, st_count, st_entsize, i, j;
|
|
uint64_t offset;
|
|
uint32_t flags;
|
|
|
|
shdrs = vdso + FUNC(swap_uint)(ehdr->e_shoff);
|
|
sh_count = swap_uint16(ehdr->e_shnum);
|
|
sh_entsize = swap_uint16(ehdr->e_shentsize);
|
|
|
|
for (i = 0; i < sh_count; i++) {
|
|
shdr = shdrs + (i * sh_entsize);
|
|
|
|
if (swap_uint32(shdr->sh_type) == SHT_SYMTAB)
|
|
break;
|
|
}
|
|
|
|
if (i == sh_count) {
|
|
fprintf(stderr, "%s: '%s' has no symbol table\n", program_name,
|
|
path);
|
|
return false;
|
|
}
|
|
|
|
/* Get flags */
|
|
flags = swap_uint32(ehdr->e_flags);
|
|
if (elf_class == ELFCLASS64)
|
|
elf_abi = ABI_N64;
|
|
else if (flags & EF_MIPS_ABI2)
|
|
elf_abi = ABI_N32;
|
|
else
|
|
elf_abi = ABI_O32;
|
|
|
|
/* Get symbol table. */
|
|
symtab = vdso + FUNC(swap_uint)(shdr->sh_offset);
|
|
st_entsize = FUNC(swap_uint)(shdr->sh_entsize);
|
|
st_count = FUNC(swap_uint)(shdr->sh_size) / st_entsize;
|
|
|
|
/* Get string table. */
|
|
shdr = shdrs + (swap_uint32(shdr->sh_link) * sh_entsize);
|
|
strtab = vdso + FUNC(swap_uint)(shdr->sh_offset);
|
|
|
|
/* Write offsets for symbols needed by the kernel. */
|
|
for (i = 0; vdso_symbols[i].name; i++) {
|
|
if (!(vdso_symbols[i].abis & elf_abi))
|
|
continue;
|
|
|
|
for (j = 0; j < st_count; j++) {
|
|
sym = symtab + (j * st_entsize);
|
|
name = strtab + swap_uint32(sym->st_name);
|
|
|
|
if (!strcmp(name, vdso_symbols[i].name)) {
|
|
offset = FUNC(swap_uint)(sym->st_value);
|
|
|
|
fprintf(out_file,
|
|
"\t.%s = 0x%" PRIx64 ",\n",
|
|
vdso_symbols[i].offset_name, offset);
|
|
break;
|
|
}
|
|
}
|
|
|
|
if (j == st_count) {
|
|
fprintf(stderr,
|
|
"%s: '%s' is missing required symbol '%s'\n",
|
|
program_name, path, vdso_symbols[i].name);
|
|
return false;
|
|
}
|
|
}
|
|
|
|
return true;
|
|
}
|