Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1751221AbdFEAkN (ORCPT ); Sun, 4 Jun 2017 20:40:13 -0400 Received: from szxga02-in.huawei.com ([45.249.212.188]:6863 "EHLO szxga02-in.huawei.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751163AbdFEAkH (ORCPT ); Sun, 4 Jun 2017 20:40:07 -0400 From: Li Bin To: CC: , , , , , , , , , , , , , Subject: [PATCH] perf symbols: Fix plt entry calculation for ARM and AARCH64 Date: Mon, 5 Jun 2017 08:34:09 +0800 Message-ID: <1496622849-21877-1-git-send-email-huawei.libin@huawei.com> X-Mailer: git-send-email 1.7.12.4 MIME-Version: 1.0 Content-Type: text/plain X-Originating-IP: [10.175.102.37] X-CFilter-Loop: Reflected X-Mirapoint-Virus-RAPID-Raw: score=unknown(0), refid=str=0001.0A020202.5934A851.0027,ss=1,re=0.000,recu=0.000,reip=0.000,cl=1,cld=1,fgs=0, ip=0.0.0.0, so=2014-11-16 11:51:01, dmn=2013-03-21 17:37:32 X-Mirapoint-Loop-Id: 0cc8a5ccf3dafb9ce7d9ad3ba5ea5d5c Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 5211 Lines: 149 On x86, the plt header size is as same as the plt entry size, and can be identified from shdr's sh_entsize of the plt. But we cann't assume that the sh_entsize of the plt shdr is always the plt entry size in all architecture, and the plt header size may be not as same as the plt entry size in some architecure. On ARM, the plt header size is 20 bytes and the plt entry size is 12 bytes(don't consider the FOUR_WORD_PLT case) that refer to the binutils implementation. plt section is as follows: Disassembly of section .plt: 000004a0 <__cxa_finalize@plt-0x14>: 4a0: e52de004 push {lr} ; (str lr, [sp, #-4]!) 4a4: e59fe004 ldr lr, [pc, #4] ; 4b0 <_init+0x1c> 4a8: e08fe00e add lr, pc, lr 4ac: e5bef008 ldr pc, [lr, #8]! 4b0: 00008424 .word 0x00008424 000004b4 <__cxa_finalize@plt>: 4b4: e28fc600 add ip, pc, #0, 12 4b8: e28cca08 add ip, ip, #8, 20 ; 0x8000 4bc: e5bcf424 ldr pc, [ip, #1060]! ; 0x424 000004c0 : 4c0: e28fc600 add ip, pc, #0, 12 4c4: e28cca08 add ip, ip, #8, 20 ; 0x8000 4c8: e5bcf41c ldr pc, [ip, #1052]! ; 0x41c On AARCH64, the plt header size is 32 bytes and the plt entry size is 16 bytes. plt section is as follows: Disassembly of section .plt: 0000000000000560 <__cxa_finalize@plt-0x20>: 560: a9bf7bf0 stp x16, x30, [sp,#-16]! 564: 90000090 adrp x16, 10000 <__FRAME_END__+0xf8a8> 568: f944be11 ldr x17, [x16,#2424] 56c: 9125e210 add x16, x16, #0x978 570: d61f0220 br x17 574: d503201f nop 578: d503201f nop 57c: d503201f nop 0000000000000580 <__cxa_finalize@plt>: 580: 90000090 adrp x16, 10000 <__FRAME_END__+0xf8a8> 584: f944c211 ldr x17, [x16,#2432] 588: 91260210 add x16, x16, #0x980 58c: d61f0220 br x17 0000000000000590 <__gmon_start__@plt>: 590: 90000090 adrp x16, 10000 <__FRAME_END__+0xf8a8> 594: f944c611 ldr x17, [x16,#2440] 598: 91262210 add x16, x16, #0x988 59c: d61f0220 br x17 NOTES: In addition to ARM and AARCH64, other architectures, such as s390/alpha/mips/parisc/poperpc/sh/sparc/xtensa also need to consider this issue. Signed-off-by: Li Bin --- tools/perf/util/symbol-elf.c | 27 ++++++++++++++++++++++----- 1 file changed, 22 insertions(+), 5 deletions(-) diff --git a/tools/perf/util/symbol-elf.c b/tools/perf/util/symbol-elf.c index e7ee47f..1bccf71 100644 --- a/tools/perf/util/symbol-elf.c +++ b/tools/perf/util/symbol-elf.c @@ -259,7 +259,7 @@ int dso__synthesize_plt_symbols(struct dso *dso, struct symsrc *ss, struct map * { uint32_t nr_rel_entries, idx; GElf_Sym sym; - u64 plt_offset; + u64 plt_offset, plt_header_size, plt_entry_size; GElf_Shdr shdr_plt; struct symbol *f; GElf_Shdr shdr_rel_plt, shdr_dynsym; @@ -326,6 +326,23 @@ int dso__synthesize_plt_symbols(struct dso *dso, struct symsrc *ss, struct map * nr_rel_entries = shdr_rel_plt.sh_size / shdr_rel_plt.sh_entsize; plt_offset = shdr_plt.sh_offset; + switch (ehdr.e_machine) { + case EM_ARM: + plt_header_size = 20; + plt_entry_size = 12; + break; + + case EM_AARCH64: + plt_header_size = 32; + plt_entry_size = 16; + break; + + default: /* FIXME: s390/alpha/mips/parisc/poperpc/sh/sparc/xtensa need to be checked */ + plt_header_size = shdr_plt.sh_entsize; + plt_entry_size = shdr_plt.sh_entsize; + break; + } + plt_offset += plt_header_size; if (shdr_rel_plt.sh_type == SHT_RELA) { GElf_Rela pos_mem, *pos; @@ -335,7 +352,6 @@ int dso__synthesize_plt_symbols(struct dso *dso, struct symsrc *ss, struct map * const char *elf_name = NULL; char *demangled = NULL; symidx = GELF_R_SYM(pos->r_info); - plt_offset += shdr_plt.sh_entsize; gelf_getsym(syms, symidx, &sym); elf_name = elf_sym__name(&sym, symstrs); @@ -346,11 +362,12 @@ int dso__synthesize_plt_symbols(struct dso *dso, struct symsrc *ss, struct map * "%s@plt", elf_name); free(demangled); - f = symbol__new(plt_offset, shdr_plt.sh_entsize, + f = symbol__new(plt_offset, plt_entry_size, STB_GLOBAL, sympltname); if (!f) goto out_elf_end; + plt_offset += plt_entry_size; symbols__insert(&dso->symbols[map->type], f); ++nr; } @@ -361,7 +378,6 @@ int dso__synthesize_plt_symbols(struct dso *dso, struct symsrc *ss, struct map * const char *elf_name = NULL; char *demangled = NULL; symidx = GELF_R_SYM(pos->r_info); - plt_offset += shdr_plt.sh_entsize; gelf_getsym(syms, symidx, &sym); elf_name = elf_sym__name(&sym, symstrs); @@ -372,11 +388,12 @@ int dso__synthesize_plt_symbols(struct dso *dso, struct symsrc *ss, struct map * "%s@plt", elf_name); free(demangled); - f = symbol__new(plt_offset, shdr_plt.sh_entsize, + f = symbol__new(plt_offset, plt_entry_size, STB_GLOBAL, sympltname); if (!f) goto out_elf_end; + plt_offset += plt_entry_size; symbols__insert(&dso->symbols[map->type], f); ++nr; } -- 1.7.12.4