130 lines
3.4 KiB
C
Executable file
130 lines
3.4 KiB
C
Executable file
/*
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* This file is subject to the terms and conditions of the GNU General Public
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* License. See the file COPYING in the main directory of this archive
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* for more details.
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*/
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#include <linux/moduleloader.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/kernel.h>
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#if 0
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#define DEBUGP(fmt, ...) printk(KERN_DEBUG pr_fmt(fmt), ##__VA_ARGS__)
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#else
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#define DEBUGP(fmt, ...) no_printk(KERN_DEBUG pr_fmt(fmt), ##__VA_ARGS__)
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#endif
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#ifdef CONFIG_MODULES
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int apply_relocate(Elf32_Shdr *sechdrs,
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const char *strtab,
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unsigned int symindex,
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unsigned int relsec,
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struct module *me)
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{
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unsigned int i;
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Elf32_Rel *rel = (void *)sechdrs[relsec].sh_addr;
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Elf32_Sym *sym;
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uint32_t *location;
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DEBUGP("Applying relocate section %u to %u\n", relsec,
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sechdrs[relsec].sh_info);
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for (i = 0; i < sechdrs[relsec].sh_size / sizeof(*rel); i++) {
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/* This is where to make the change */
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location = (void *)sechdrs[sechdrs[relsec].sh_info].sh_addr
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+ rel[i].r_offset;
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/* This is the symbol it is referring to. Note that all
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undefined symbols have been resolved. */
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sym = (Elf32_Sym *)sechdrs[symindex].sh_addr
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+ ELF32_R_SYM(rel[i].r_info);
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switch (ELF32_R_TYPE(rel[i].r_info)) {
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case R_68K_32:
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/* We add the value into the location given */
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*location += sym->st_value;
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break;
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case R_68K_PC32:
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/* Add the value, subtract its position */
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*location += sym->st_value - (uint32_t)location;
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break;
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default:
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pr_err("module %s: Unknown relocation: %u\n", me->name,
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ELF32_R_TYPE(rel[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 apply_relocate_add(Elf32_Shdr *sechdrs,
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const char *strtab,
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unsigned int symindex,
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unsigned int relsec,
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struct module *me)
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{
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unsigned int i;
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Elf32_Rela *rel = (void *)sechdrs[relsec].sh_addr;
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Elf32_Sym *sym;
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uint32_t *location;
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DEBUGP("Applying relocate_add section %u to %u\n", relsec,
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sechdrs[relsec].sh_info);
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for (i = 0; i < sechdrs[relsec].sh_size / sizeof(*rel); i++) {
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/* This is where to make the change */
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location = (void *)sechdrs[sechdrs[relsec].sh_info].sh_addr
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+ rel[i].r_offset;
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/* This is the symbol it is referring to. Note that all
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undefined symbols have been resolved. */
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sym = (Elf32_Sym *)sechdrs[symindex].sh_addr
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+ ELF32_R_SYM(rel[i].r_info);
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switch (ELF32_R_TYPE(rel[i].r_info)) {
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case R_68K_32:
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/* We add the value into the location given */
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*location = rel[i].r_addend + sym->st_value;
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break;
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case R_68K_PC32:
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/* Add the value, subtract its position */
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*location = rel[i].r_addend + sym->st_value - (uint32_t)location;
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break;
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default:
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pr_err("module %s: Unknown relocation: %u\n", me->name,
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ELF32_R_TYPE(rel[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 Elf_Ehdr *hdr,
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const Elf_Shdr *sechdrs,
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struct module *mod)
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{
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module_fixup(mod, mod->arch.fixup_start, mod->arch.fixup_end);
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return 0;
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}
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#endif /* CONFIG_MODULES */
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void module_fixup(struct module *mod, struct m68k_fixup_info *start,
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struct m68k_fixup_info *end)
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{
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#ifdef CONFIG_MMU
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struct m68k_fixup_info *fixup;
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for (fixup = start; fixup < end; fixup++) {
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switch (fixup->type) {
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case m68k_fixup_memoffset:
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*(u32 *)fixup->addr = m68k_memoffset;
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break;
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case m68k_fixup_vnode_shift:
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*(u16 *)fixup->addr += m68k_virt_to_node_shift;
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break;
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}
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}
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#endif
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}
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