diff options
| -rw-r--r-- | arch/openrisc/kernel/module.c | 72 |
1 files changed, 72 insertions, 0 deletions
diff --git a/arch/openrisc/kernel/module.c b/arch/openrisc/kernel/module.c new file mode 100644 index 00000000000..10ff50f0202 --- /dev/null +++ b/arch/openrisc/kernel/module.c @@ -0,0 +1,72 @@ +/* + * OpenRISC module.c + * + * Linux architectural port borrowing liberally from similar works of + * others. All original copyrights apply as per the original source + * declaration. + * + * Modifications for the OpenRISC architecture: + * Copyright (C) 2010-2011 Jonas Bonn <jonas@southpole.se> + * + * 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. + */ + +#include <linux/moduleloader.h> +#include <linux/elf.h> + +int apply_relocate_add(Elf32_Shdr *sechdrs, + const char *strtab, + unsigned int symindex, + unsigned int relsec, + struct module *me) +{ + unsigned int i; + Elf32_Rela *rel = (void *)sechdrs[relsec].sh_addr; + Elf32_Sym *sym; + uint32_t *location; + uint32_t value; + + pr_debug("Applying relocate section %u to %u\n", relsec, + sechdrs[relsec].sh_info); + for (i = 0; i < sechdrs[relsec].sh_size / sizeof(*rel); i++) { + /* This is where to make the change */ + location = (void *)sechdrs[sechdrs[relsec].sh_info].sh_addr + + rel[i].r_offset; + + /* This is the symbol it is referring to. Note that all + undefined symbols have been resolved. */ + sym = (Elf32_Sym *)sechdrs[symindex].sh_addr + + ELF32_R_SYM(rel[i].r_info); + value = sym->st_value + rel[i].r_addend; + + switch (ELF32_R_TYPE(rel[i].r_info)) { + case R_OR32_32: + *location = value; + break; + case R_OR32_CONST: + location = (uint16_t *)location + 1; + *((uint16_t *)location) = (uint16_t) (value); + break; + case R_OR32_CONSTH: + location = (uint16_t *)location + 1; + *((uint16_t *)location) = (uint16_t) (value >> 16); + break; + case R_OR32_JUMPTARG: + value -= (uint32_t)location; + value >>= 2; + value &= 0x03ffffff; + value |= *location & 0xfc000000; + *location = value; + break; + default: + pr_err("module %s: Unknown relocation: %u\n", + me->name, ELF32_R_TYPE(rel[i].r_info)); + break; + } + } + + return 0; +} |