diff options
Diffstat (limited to 'arch/mn10300/kernel/module.c')
| -rw-r--r-- | arch/mn10300/kernel/module.c | 136 |
1 files changed, 43 insertions, 93 deletions
diff --git a/arch/mn10300/kernel/module.c b/arch/mn10300/kernel/module.c index 0e4d2f6fa6e..216ad23c957 100644 --- a/arch/mn10300/kernel/module.c +++ b/arch/mn10300/kernel/module.c @@ -1,6 +1,6 @@ /* MN10300 Kernel module helper routines * - * Copyright (C) 2007 Red Hat, Inc. All Rights Reserved. + * Copyright (C) 2007, 2008, 2009 Red Hat, Inc. All Rights Reserved. * Written by Mark Salter (msalter@redhat.com) * - Derived from arch/i386/kernel/module.c * @@ -24,6 +24,7 @@ #include <linux/fs.h> #include <linux/string.h> #include <linux/kernel.h> +#include <linux/bug.h> #if 0 #define DEBUGP printk @@ -31,53 +32,6 @@ #define DEBUGP(fmt, ...) #endif -/* - * allocate storage for a module - */ -void *module_alloc(unsigned long size) -{ - if (size == 0) - return NULL; - return vmalloc_exec(size); -} - -/* - * free memory returned from module_alloc() - */ -void module_free(struct module *mod, void *module_region) -{ - vfree(module_region); - /* FIXME: If module_region == mod->init_region, trim exception - * table entries. */ -} - -/* - * allow the arch to fix up the section table - * - we don't need anything special - */ -int module_frob_arch_sections(Elf_Ehdr *hdr, - Elf_Shdr *sechdrs, - char *secstrings, - struct module *mod) -{ - return 0; -} - -static uint32_t reloc_get16(uint8_t *p) -{ - return p[0] | (p[1] << 8); -} - -static uint32_t reloc_get24(uint8_t *p) -{ - return reloc_get16(p) | (p[2] << 16); -} - -static uint32_t reloc_get32(uint8_t *p) -{ - return reloc_get16(p) | (reloc_get16(p+2) << 16); -} - static void reloc_put16(uint8_t *p, uint32_t val) { p[0] = val & 0xff; @@ -97,20 +51,6 @@ static void reloc_put32(uint8_t *p, uint32_t val) } /* - * apply a REL relocation - */ -int apply_relocate(Elf32_Shdr *sechdrs, - const char *strtab, - unsigned int symindex, - unsigned int relsec, - struct module *me) -{ - printk(KERN_ERR "module %s: RELOCATION unsupported\n", - me->name); - return -ENOEXEC; -} - -/* * apply a RELA relocation */ int apply_relocate_add(Elf32_Shdr *sechdrs, @@ -119,10 +59,10 @@ int apply_relocate_add(Elf32_Shdr *sechdrs, unsigned int relsec, struct module *me) { - unsigned int i; + unsigned int i, sym_diff_seen = 0; Elf32_Rela *rel = (void *)sechdrs[relsec].sh_addr; Elf32_Sym *sym; - Elf32_Addr relocation; + Elf32_Addr relocation, sym_diff_val = 0; uint8_t *location; uint32_t value; @@ -142,26 +82,36 @@ int apply_relocate_add(Elf32_Shdr *sechdrs, /* this is the adjustment to be made */ relocation = sym->st_value + rel[i].r_addend; + if (sym_diff_seen) { + switch (ELF32_R_TYPE(rel[i].r_info)) { + case R_MN10300_32: + case R_MN10300_24: + case R_MN10300_16: + case R_MN10300_8: + relocation -= sym_diff_val; + sym_diff_seen = 0; + break; + default: + printk(KERN_ERR "module %s: Unexpected SYM_DIFF relocation: %u\n", + me->name, ELF32_R_TYPE(rel[i].r_info)); + return -ENOEXEC; + } + } + switch (ELF32_R_TYPE(rel[i].r_info)) { - /* for the first four relocation types, we add the - * adjustment into the value at the location given */ + /* for the first four relocation types, we simply + * store the adjustment at the location given */ case R_MN10300_32: - value = reloc_get32(location); - value += relocation; - reloc_put32(location, value); + reloc_put32(location, relocation); break; case R_MN10300_24: - value = reloc_get24(location); - value += relocation; - reloc_put24(location, value); + reloc_put24(location, relocation); break; case R_MN10300_16: - value = reloc_get16(location); - value += relocation; - reloc_put16(location, value); + reloc_put16(location, relocation); break; case R_MN10300_8: - *location += relocation; + *location = relocation; break; /* for the next three relocation types, we write the @@ -179,28 +129,28 @@ int apply_relocate_add(Elf32_Shdr *sechdrs, *location = relocation - (uint32_t) location; break; + case R_MN10300_SYM_DIFF: + /* This is used to adjust the next reloc as required + * by relaxation. */ + sym_diff_seen = 1; + sym_diff_val = sym->st_value; + break; + + case R_MN10300_ALIGN: + /* Just ignore the ALIGN relocs. + * Only interesting if kernel performed relaxation. */ + continue; + default: printk(KERN_ERR "module %s: Unknown relocation: %u\n", me->name, ELF32_R_TYPE(rel[i].r_info)); return -ENOEXEC; } } + if (sym_diff_seen) { + printk(KERN_ERR "module %s: Nothing follows SYM_DIFF relocation: %u\n", + me->name, ELF32_R_TYPE(rel[i].r_info)); + return -ENOEXEC; + } return 0; } - -/* - * finish loading the module - */ -int module_finalize(const Elf_Ehdr *hdr, - const Elf_Shdr *sechdrs, - struct module *me) -{ - return 0; -} - -/* - * finish clearing the module - */ -void module_arch_cleanup(struct module *mod) -{ -} |