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author | Sascha Hauer <s.hauer@pengutronix.de> | 2007-10-03 21:09:00 +0200 |
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committer | Sascha Hauer <s.hauer@pengutronix.de> | 2007-10-03 21:09:00 +0200 |
commit | a07743ea18d629cfa7a5c29957d20cc75cf0ce73 (patch) | |
tree | 46523e208d2e66531901c0140f9e7427b08488eb /arch/arm | |
parent | e5e965b7f4f9cfd4e66d4d0a9aa009c268a18522 (diff) | |
download | barebox-a07743ea18d629cfa7a5c29957d20cc75cf0ce73.tar.gz barebox-a07743ea18d629cfa7a5c29957d20cc75cf0ce73.tar.xz |
module support for arm
Diffstat (limited to 'arch/arm')
-rw-r--r-- | arch/arm/lib/module.c | 98 |
1 files changed, 98 insertions, 0 deletions
diff --git a/arch/arm/lib/module.c b/arch/arm/lib/module.c new file mode 100644 index 0000000000..643a8bed0e --- /dev/null +++ b/arch/arm/lib/module.c @@ -0,0 +1,98 @@ +/* + * linux/arch/arm/kernel/module.c + * + * Copyright (C) 2002 Russell King. + * Modified for nommu by Hyok S. Choi + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License version 2 as + * published by the Free Software Foundation. + * + * Module allocation method suggested by Andi Kleen. + */ + +//#include <asm/pgtable.h> +#include <common.h> +#include <elf.h> +#include <module.h> +#include <errno.h> + +int +apply_relocate(Elf32_Shdr *sechdrs, const char *strtab, unsigned int symindex, + unsigned int relindex, struct module *module) +{ + Elf32_Shdr *symsec = sechdrs + symindex; + Elf32_Shdr *relsec = sechdrs + relindex; + Elf32_Shdr *dstsec = sechdrs + relsec->sh_info; + Elf32_Rel *rel = (void *)relsec->sh_addr; + unsigned int i; + + for (i = 0; i < relsec->sh_size / sizeof(Elf32_Rel); i++, rel++) { + unsigned long loc; + Elf32_Sym *sym; + s32 offset; + + offset = ELF32_R_SYM(rel->r_info); + if (offset < 0 || offset > (symsec->sh_size / sizeof(Elf32_Sym))) { + printf("%s: bad relocation, section %d reloc %d\n", + module->name, relindex, i); + return -ENOEXEC; + } + + sym = ((Elf32_Sym *)symsec->sh_addr) + offset; + + if (rel->r_offset < 0 || rel->r_offset > dstsec->sh_size - sizeof(u32)) { + printf("%s: out of bounds relocation, " + "section %d reloc %d offset %d size %d\n", + module->name, relindex, i, rel->r_offset, + dstsec->sh_size); + return -ENOEXEC; + } + + loc = dstsec->sh_addr + rel->r_offset; + + switch (ELF32_R_TYPE(rel->r_info)) { + case R_ARM_ABS32: + *(u32 *)loc += sym->st_value; + break; + + case R_ARM_PC24: + case R_ARM_CALL: + case R_ARM_JUMP24: + offset = (*(u32 *)loc & 0x00ffffff) << 2; + if (offset & 0x02000000) + offset -= 0x04000000; + + offset += sym->st_value - loc; + if (offset & 3 || + offset <= (s32)0xfe000000 || + offset >= (s32)0x02000000) { + printf("%s: relocation out of range, section " + "%d reloc %d sym '%s'\n", module->name, + relindex, i, strtab + sym->st_name); + return -ENOEXEC; + } + + offset >>= 2; + + *(u32 *)loc &= 0xff000000; + *(u32 *)loc |= offset & 0x00ffffff; + break; + + default: + printf("%s: unknown relocation: %u\n", + module->name, ELF32_R_TYPE(rel->r_info)); + return -ENOEXEC; + } + } + return 0; +} + +int +apply_relocate_add(Elf32_Shdr *sechdrs, const char *strtab, + unsigned int symindex, unsigned int relsec, struct module *module) +{ + printf("module %s: ADD RELOCATION unsupported\n", + module->name); + return -ENOEXEC; +} |