ARM: module: clean up handling of ELF unwind tables
There's no need to keep pointers to the ELF sections available while the module is loaded - we only need the section pointers while we're finding and registering the unwind tables, which can all be done during the finalize stage of loading. Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
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@ -8,11 +8,6 @@
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struct unwind_table;
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struct unwind_table;
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#ifdef CONFIG_ARM_UNWIND
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#ifdef CONFIG_ARM_UNWIND
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struct arm_unwind_mapping {
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Elf_Shdr *unw_sec;
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Elf_Shdr *sec_text;
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struct unwind_table *unwind;
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};
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enum {
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enum {
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ARM_SEC_INIT,
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ARM_SEC_INIT,
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ARM_SEC_DEVINIT,
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ARM_SEC_DEVINIT,
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@ -21,14 +16,14 @@ enum {
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ARM_SEC_DEVEXIT,
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ARM_SEC_DEVEXIT,
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ARM_SEC_MAX,
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ARM_SEC_MAX,
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};
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};
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struct mod_arch_specific {
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struct arm_unwind_mapping map[ARM_SEC_MAX];
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};
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#else
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struct mod_arch_specific {
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};
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#endif
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#endif
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struct mod_arch_specific {
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#ifdef CONFIG_ARM_UNWIND
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struct unwind_table *unwind[ARM_SEC_MAX];
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#endif
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};
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/*
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/*
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* Include the ARM architecture version.
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* Include the ARM architecture version.
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*/
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*/
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@ -67,35 +67,6 @@ int module_frob_arch_sections(Elf_Ehdr *hdr,
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char *secstrings,
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char *secstrings,
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struct module *mod)
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struct module *mod)
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{
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{
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#ifdef CONFIG_ARM_UNWIND
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Elf_Shdr *s, *sechdrs_end = sechdrs + hdr->e_shnum;
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struct arm_unwind_mapping *maps = mod->arch.map;
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for (s = sechdrs; s < sechdrs_end; s++) {
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char const *secname = secstrings + s->sh_name;
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if (strcmp(".ARM.exidx.init.text", secname) == 0)
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maps[ARM_SEC_INIT].unw_sec = s;
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else if (strcmp(".ARM.exidx.devinit.text", secname) == 0)
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maps[ARM_SEC_DEVINIT].unw_sec = s;
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else if (strcmp(".ARM.exidx", secname) == 0)
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maps[ARM_SEC_CORE].unw_sec = s;
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else if (strcmp(".ARM.exidx.exit.text", secname) == 0)
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maps[ARM_SEC_EXIT].unw_sec = s;
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else if (strcmp(".ARM.exidx.devexit.text", secname) == 0)
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maps[ARM_SEC_DEVEXIT].unw_sec = s;
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else if (strcmp(".init.text", secname) == 0)
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maps[ARM_SEC_INIT].sec_text = s;
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else if (strcmp(".devinit.text", secname) == 0)
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maps[ARM_SEC_DEVINIT].sec_text = s;
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else if (strcmp(".text", secname) == 0)
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maps[ARM_SEC_CORE].sec_text = s;
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else if (strcmp(".exit.text", secname) == 0)
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maps[ARM_SEC_EXIT].sec_text = s;
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else if (strcmp(".devexit.text", secname) == 0)
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maps[ARM_SEC_DEVEXIT].sec_text = s;
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}
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#endif
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return 0;
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return 0;
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}
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}
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@ -300,41 +271,66 @@ apply_relocate_add(Elf32_Shdr *sechdrs, const char *strtab,
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return -ENOEXEC;
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return -ENOEXEC;
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}
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}
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struct mod_unwind_map {
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const Elf_Shdr *unw_sec;
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const Elf_Shdr *txt_sec;
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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 *mod)
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{
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#ifdef CONFIG_ARM_UNWIND
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#ifdef CONFIG_ARM_UNWIND
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static void register_unwind_tables(struct module *mod)
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const char *secstrs = (void *)hdr + sechdrs[hdr->e_shstrndx].sh_offset;
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{
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const Elf_Shdr *s, *sechdrs_end = sechdrs + hdr->e_shnum;
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struct mod_unwind_map maps[ARM_SEC_MAX];
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int i;
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int i;
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for (i = 0; i < ARM_SEC_MAX; ++i) {
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struct arm_unwind_mapping *map = &mod->arch.map[i];
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memset(maps, 0, sizeof(maps));
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if (map->unw_sec && map->sec_text)
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map->unwind = unwind_table_add(map->unw_sec->sh_addr,
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for (s = sechdrs; s < sechdrs_end; s++) {
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map->unw_sec->sh_size,
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const char *secname = secstrs + s->sh_name;
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map->sec_text->sh_addr,
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map->sec_text->sh_size);
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if (strcmp(".ARM.exidx.init.text", secname) == 0)
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maps[ARM_SEC_INIT].unw_sec = s;
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else if (strcmp(".ARM.exidx.devinit.text", secname) == 0)
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maps[ARM_SEC_DEVINIT].unw_sec = s;
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else if (strcmp(".ARM.exidx", secname) == 0)
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maps[ARM_SEC_CORE].unw_sec = s;
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else if (strcmp(".ARM.exidx.exit.text", secname) == 0)
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maps[ARM_SEC_EXIT].unw_sec = s;
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else if (strcmp(".ARM.exidx.devexit.text", secname) == 0)
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maps[ARM_SEC_DEVEXIT].unw_sec = s;
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else if (strcmp(".init.text", secname) == 0)
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maps[ARM_SEC_INIT].txt_sec = s;
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else if (strcmp(".devinit.text", secname) == 0)
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maps[ARM_SEC_DEVINIT].txt_sec = s;
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else if (strcmp(".text", secname) == 0)
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maps[ARM_SEC_CORE].txt_sec = s;
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else if (strcmp(".exit.text", secname) == 0)
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maps[ARM_SEC_EXIT].txt_sec = s;
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else if (strcmp(".devexit.text", secname) == 0)
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maps[ARM_SEC_DEVEXIT].txt_sec = s;
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}
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}
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}
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static void unregister_unwind_tables(struct module *mod)
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for (i = 0; i < ARM_SEC_MAX; i++)
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{
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if (maps[i].unw_sec && maps[i].txt_sec)
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int i = ARM_SEC_MAX;
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mod->arch.unwind[i] =
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while (--i >= 0)
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unwind_table_add(maps[i].unw_sec->sh_addr,
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unwind_table_del(mod->arch.map[i].unwind);
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maps[i].unw_sec->sh_size,
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}
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maps[i].txt_sec->sh_addr,
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#else
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maps[i].txt_sec->sh_size);
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static inline void register_unwind_tables(struct module *mod) { }
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static inline void unregister_unwind_tables(struct module *mod) { }
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#endif
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#endif
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int
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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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register_unwind_tables(module);
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return 0;
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return 0;
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}
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}
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void
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void
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module_arch_cleanup(struct module *mod)
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module_arch_cleanup(struct module *mod)
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{
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{
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unregister_unwind_tables(mod);
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#ifdef CONFIG_ARM_UNWIND
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int i;
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for (i = 0; i < ARM_SEC_MAX; i++)
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if (mod->arch.unwind[i])
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unwind_table_del(mod->arch.unwind[i]);
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#endif
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}
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}
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