12345678910111213141516171819202122232425262728293031323334353637383940414243444546474849505152535455565758596061626364656667686970 |
- /*
- * 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:
- *((uint16_t *)location + 1) = value;
- break;
- case R_OR32_CONSTH:
- *((uint16_t *)location + 1) = 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;
- }
|