From d65283f7b695b5d04ca1ab58b6bb41f443b96286 Mon Sep 17 00:00:00 2001 From: Vineet Gupta Date: Tue, 25 Oct 2016 10:43:20 -0700 Subject: [PATCH] ARC: module: elide loop to save reference to .eh_frame The loop was really needed in .debug_frame regime where wanted make it as SH_ALLOC so that apply_relocate_add() would process it. That's not needed for .eh_frame, so we check this in apply_relocate_add() which gets called for each section. Note that we need to save reference to "section name strings" section in module_frob_arch_sections() since apply_relocate_add() doesn't get that Signed-off-by: Vineet Gupta --- arch/arc/include/asm/module.h | 1 + arch/arc/kernel/module.c | 18 ++++++++---------- 2 files changed, 9 insertions(+), 10 deletions(-) diff --git a/arch/arc/include/asm/module.h b/arch/arc/include/asm/module.h index 518222bb3f8e..6e91d8b339c3 100644 --- a/arch/arc/include/asm/module.h +++ b/arch/arc/include/asm/module.h @@ -18,6 +18,7 @@ struct mod_arch_specific { void *unw_info; int unw_sec_idx; + const char *secstr; }; #endif diff --git a/arch/arc/kernel/module.c b/arch/arc/kernel/module.c index 9a2849756022..24bd2ffb90b7 100644 --- a/arch/arc/kernel/module.c +++ b/arch/arc/kernel/module.c @@ -30,17 +30,9 @@ int module_frob_arch_sections(Elf_Ehdr *hdr, Elf_Shdr *sechdrs, char *secstr, struct module *mod) { #ifdef CONFIG_ARC_DW2_UNWIND - int i; - mod->arch.unw_sec_idx = 0; mod->arch.unw_info = NULL; - - for (i = 1; i < hdr->e_shnum; i++) { - if (strcmp(secstr+sechdrs[i].sh_name, ".eh_frame") == 0) { - mod->arch.unw_sec_idx = i; - break; - } - } + mod->arch.secstr = secstr; #endif return 0; } @@ -66,8 +58,10 @@ int apply_relocate_add(Elf32_Shdr *sechdrs, Elf32_Addr location; Elf32_Addr sec_to_patch; int relo_type; + unsigned int tgtsec; - sec_to_patch = sechdrs[sechdrs[relsec].sh_info].sh_addr; + tgtsec = sechdrs[relsec].sh_info; + sec_to_patch = sechdrs[tgtsec].sh_addr; sym_sec = (Elf32_Sym *) sechdrs[symindex].sh_addr; n = sechdrs[relsec].sh_size / sizeof(*rel_entry); @@ -111,6 +105,10 @@ int apply_relocate_add(Elf32_Shdr *sechdrs, goto relo_err; } + + if (strcmp(module->arch.secstr+sechdrs[tgtsec].sh_name, ".eh_frame") == 0) + module->arch.unw_sec_idx = tgtsec; + return 0; relo_err: -- 2.20.1