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96 lines
2.3 KiB
96 lines
2.3 KiB
// SPDX-License-Identifier: GPL-2.0-only |
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/* |
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* Copyright (C) 2007-2009 Michal Simek <[email protected]> |
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* Copyright (C) 2007-2009 PetaLogix |
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*/ |
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#include <linux/export.h> |
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#include <linux/moduleloader.h> |
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#include <linux/kernel.h> |
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#include <linux/elf.h> |
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#include <linux/vmalloc.h> |
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#include <linux/fs.h> |
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#include <linux/string.h> |
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#include <linux/pgtable.h> |
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#include <asm/cacheflush.h> |
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int apply_relocate_add(Elf32_Shdr *sechdrs, const char *strtab, |
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unsigned int symindex, unsigned int relsec, struct module *module) |
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{ |
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unsigned int i; |
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Elf32_Rela *rela = (void *)sechdrs[relsec].sh_addr; |
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Elf32_Sym *sym; |
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unsigned long int *location; |
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unsigned long int value; |
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pr_debug("Applying add relocation section %u to %u\n", |
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relsec, sechdrs[relsec].sh_info); |
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for (i = 0; i < sechdrs[relsec].sh_size / sizeof(*rela); i++) { |
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location = (void *)sechdrs[sechdrs[relsec].sh_info].sh_addr + |
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rela[i].r_offset; |
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sym = (Elf32_Sym *)sechdrs[symindex].sh_addr + |
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ELF32_R_SYM(rela[i].r_info); |
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value = sym->st_value + rela[i].r_addend; |
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switch (ELF32_R_TYPE(rela[i].r_info)) { |
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/* |
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* Be careful! mb-gcc / mb-ld splits the relocs between the |
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* text and the reloc table. In general this means we must |
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* read the current contents of (*location), add any offset |
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* then store the result back in |
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*/ |
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case R_MICROBLAZE_32: |
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*location = value; |
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break; |
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case R_MICROBLAZE_64: |
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location[0] = (location[0] & 0xFFFF0000) | |
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(value >> 16); |
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location[1] = (location[1] & 0xFFFF0000) | |
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(value & 0xFFFF); |
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break; |
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case R_MICROBLAZE_64_PCREL: |
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value -= (unsigned long int)(location) + 4; |
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location[0] = (location[0] & 0xFFFF0000) | |
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(value >> 16); |
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location[1] = (location[1] & 0xFFFF0000) | |
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(value & 0xFFFF); |
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pr_debug("R_MICROBLAZE_64_PCREL (%08lx)\n", |
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value); |
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break; |
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case R_MICROBLAZE_32_PCREL_LO: |
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pr_debug("R_MICROBLAZE_32_PCREL_LO\n"); |
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break; |
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case R_MICROBLAZE_64_NONE: |
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pr_debug("R_MICROBLAZE_64_NONE\n"); |
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break; |
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case R_MICROBLAZE_NONE: |
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pr_debug("R_MICROBLAZE_NONE\n"); |
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break; |
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default: |
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pr_err("module %s: Unknown relocation: %u\n", |
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module->name, |
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ELF32_R_TYPE(rela[i].r_info)); |
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return -ENOEXEC; |
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} |
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} |
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return 0; |
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} |
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int module_finalize(const Elf32_Ehdr *hdr, const Elf_Shdr *sechdrs, |
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struct module *module) |
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{ |
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flush_dcache(); |
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return 0; |
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}
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