164 lines
3.6 KiB
C
164 lines
3.6 KiB
C
/* Kernel module help for sparc32.
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*
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* Copyright (C) 2001 Rusty Russell.
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* Copyright (C) 2002 David S. Miller.
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*/
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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/ctype.h>
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void *module_alloc(unsigned long size)
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{
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void *ret;
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/* We handle the zero case fine, unlike vmalloc */
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if (size == 0)
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return NULL;
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ret = vmalloc(size);
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if (!ret)
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ret = ERR_PTR(-ENOMEM);
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else
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memset(ret, 0, size);
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return ret;
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}
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/* Free memory returned from module_core_alloc/module_init_alloc */
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void module_free(struct module *mod, void *module_region)
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{
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vfree(module_region);
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/* FIXME: If module_region == mod->init_region, trim exception
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table entries. */
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}
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/* Make generic code ignore STT_REGISTER dummy undefined symbols,
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* and replace references to .func with _Func
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*/
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int module_frob_arch_sections(Elf_Ehdr *hdr,
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Elf_Shdr *sechdrs,
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char *secstrings,
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struct module *mod)
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{
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unsigned int symidx;
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Elf32_Sym *sym;
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char *strtab;
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int i;
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for (symidx = 0; sechdrs[symidx].sh_type != SHT_SYMTAB; symidx++) {
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if (symidx == hdr->e_shnum-1) {
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printk("%s: no symtab found.\n", mod->name);
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return -ENOEXEC;
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}
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}
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sym = (Elf32_Sym *)sechdrs[symidx].sh_addr;
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strtab = (char *)sechdrs[sechdrs[symidx].sh_link].sh_addr;
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for (i = 1; i < sechdrs[symidx].sh_size / sizeof(Elf_Sym); i++) {
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if (sym[i].st_shndx == SHN_UNDEF) {
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if (ELF32_ST_TYPE(sym[i].st_info) == STT_REGISTER)
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sym[i].st_shndx = SHN_ABS;
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else {
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char *name = strtab + sym[i].st_name;
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if (name[0] == '.') {
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name[0] = '_';
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name[1] = toupper(name[1]);
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}
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}
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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(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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printk(KERN_ERR "module %s: non-ADD RELOCATION unsupported\n",
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me->name);
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return -ENOEXEC;
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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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u8 *location;
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u32 *loc32;
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for (i = 0; i < sechdrs[relsec].sh_size / sizeof(*rel); i++) {
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Elf32_Addr v;
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/* This is where to make the change */
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location = (u8 *)sechdrs[sechdrs[relsec].sh_info].sh_addr
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+ rel[i].r_offset;
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loc32 = (u32 *) location;
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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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v = sym->st_value + rel[i].r_addend;
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switch (ELF32_R_TYPE(rel[i].r_info)) {
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case R_SPARC_32:
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case R_SPARC_UA32:
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location[0] = v >> 24;
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location[1] = v >> 16;
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location[2] = v >> 8;
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location[3] = v >> 0;
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break;
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case R_SPARC_WDISP30:
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v -= (Elf32_Addr) location;
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*loc32 = (*loc32 & ~0x3fffffff) |
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((v >> 2) & 0x3fffffff);
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break;
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case R_SPARC_WDISP22:
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v -= (Elf32_Addr) location;
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*loc32 = (*loc32 & ~0x3fffff) |
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((v >> 2) & 0x3fffff);
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break;
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case R_SPARC_LO10:
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*loc32 = (*loc32 & ~0x3ff) | (v & 0x3ff);
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break;
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case R_SPARC_HI22:
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*loc32 = (*loc32 & ~0x3fffff) |
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((v >> 10) & 0x3fffff);
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break;
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default:
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printk(KERN_ERR "module %s: Unknown relocation: %x\n",
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me->name,
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(int) (ELF32_R_TYPE(rel[i].r_info) & 0xff));
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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 *me)
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{
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return 0;
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}
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void module_arch_cleanup(struct module *mod)
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{
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}
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