Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S932309Ab2HIWWp (ORCPT ); Thu, 9 Aug 2012 18:22:45 -0400 Received: from e6.ny.us.ibm.com ([32.97.182.146]:34670 "EHLO e6.ny.us.ibm.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1759926Ab2HIWWl (ORCPT ); Thu, 9 Aug 2012 18:22:41 -0400 From: Cody P Schafer To: Arnaldo Carvalho de Melo Cc: LKML , Ingo Molnar , Paul Mackerras , Peter Zijlstra , Sukadev Bhattiprolu , Matt Hellsley , David Hansen Subject: [PATCH 15/16] perf symbol: convert dso__load_syms to take 2 symsrc's Date: Thu, 9 Aug 2012 15:18:40 -0700 Message-Id: <1344550721-21024-16-git-send-email-cody@linux.vnet.ibm.com> X-Mailer: git-send-email 1.7.11.3 In-Reply-To: <1344550721-21024-1-git-send-email-cody@linux.vnet.ibm.com> References: <1344550721-21024-1-git-send-email-cody@linux.vnet.ibm.com> X-Content-Scanned: Fidelis XPS MAILER x-cbid: 12080922-1976-0000-0000-00001009453E Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 5058 Lines: 147 To properly handle platforms with an opd section, both a runtime image (which contains the opd section but possibly lacks symbols) and a symbol image (which probably lacks an opd section but has symbols). The next patch ("perf symbol: use both runtime and debug images") adjusts the callsite in dso__load() to take advantage of being able to pass both runtime & debug images. Assumptions made here: - The opd section, if it exists in the runtime image, has headers in both the runtime image and the debug/syms image. - The index of the opd section (again, only if it exists in the runtime image) is the same in both the runtime and debug/symbols image. Both of these are true on RHEL, but it is unclear how accurate they are in general (on platforms with function descriptors in opd sections). Signed-off-by: Cody P Schafer --- tools/perf/util/symbol.c | 45 +++++++++++++++++++++++---------------------- 1 file changed, 23 insertions(+), 22 deletions(-) diff --git a/tools/perf/util/symbol.c b/tools/perf/util/symbol.c index 83d2276..e740dc1 100644 --- a/tools/perf/util/symbol.c +++ b/tools/perf/util/symbol.c @@ -1319,7 +1319,8 @@ static size_t elf_addr_to_index(Elf *elf, GElf_Addr addr) return -1; } -static int dso__load_sym(struct dso *dso, struct map *map, struct symsrc *ss, +static int dso__load_sym(struct dso *dso, struct map *map, + struct symsrc *syms_ss, struct symsrc *runtime_ss, symbol_filter_t filter, int kmodule) { struct kmap *kmap = dso->kernel ? map__kmap(map) : NULL; @@ -1330,26 +1331,22 @@ static int dso__load_sym(struct dso *dso, struct map *map, struct symsrc *ss, int err = -1; uint32_t idx; GElf_Ehdr ehdr; - GElf_Shdr shdr, opdshdr; + GElf_Shdr shdr; Elf_Data *syms, *opddata = NULL; GElf_Sym sym; - Elf_Scn *sec, *sec_strndx, *opdsec; + Elf_Scn *sec, *sec_strndx; Elf *elf; int nr = 0; - size_t opdidx = 0; - dso->symtab_type = ss->type; + dso->symtab_type = syms_ss->type; - elf = ss->elf; - ehdr = ss->ehdr; - sec = ss->symtab; - shdr = ss->symshdr; + elf = syms_ss->elf; + ehdr = syms_ss->ehdr; + sec = syms_ss->symtab; + shdr = syms_ss->symshdr; - opdsec = ss->opdsec; - opdshdr = ss->opdshdr; - opdidx = ss->opdidx; - if (opdsec) - opddata = elf_rawdata(opdsec, NULL); + if (runtime_ss->opdsec) + opddata = elf_rawdata(runtime_ss->opdsec, NULL); syms = elf_getdata(sec, NULL); if (syms == NULL) @@ -1374,13 +1371,14 @@ static int dso__load_sym(struct dso *dso, struct map *map, struct symsrc *ss, nr_syms = shdr.sh_size / shdr.sh_entsize; memset(&sym, 0, sizeof(sym)); - dso->adjust_symbols = ss->adjust_symbols; + dso->adjust_symbols = runtime_ss->adjust_symbols; elf_symtab__for_each_symbol(syms, nr_syms, idx, sym) { struct symbol *f; const char *elf_name = elf_sym__name(&sym, symstrs); char *demangled = NULL; int is_label = elf_sym__is_label(&sym); const char *section_name; + bool used_opd = false; if (kmap && kmap->ref_reloc_sym && kmap->ref_reloc_sym->name && strcmp(elf_name, kmap->ref_reloc_sym->name) == 0) @@ -1399,14 +1397,16 @@ static int dso__load_sym(struct dso *dso, struct map *map, struct symsrc *ss, continue; } - if (opdsec && sym.st_shndx == opdidx) { - u32 offset = sym.st_value - opdshdr.sh_addr; + if (runtime_ss->opdsec && sym.st_shndx == runtime_ss->opdidx) { + u32 offset = sym.st_value - syms_ss->opdshdr.sh_addr; u64 *opd = opddata->d_buf + offset; sym.st_value = DSO__SWAP(dso, u64, *opd); - sym.st_shndx = elf_addr_to_index(elf, sym.st_value); + sym.st_shndx = elf_addr_to_index(runtime_ss->elf, + sym.st_value); + used_opd = true; } - sec = elf_getscn(elf, sym.st_shndx); + sec = elf_getscn(runtime_ss->elf, sym.st_shndx); if (!sec) goto out_elf_end; @@ -1472,7 +1472,8 @@ static int dso__load_sym(struct dso *dso, struct map *map, struct symsrc *ss, goto new_symbol; } - if (curr_dso->adjust_symbols && sym.st_value) { + if ((used_opd && runtime_ss->adjust_symbols) + || (!used_opd && syms_ss->adjust_symbols)) { pr_debug4("%s: adjusting symbol: st_value: %#" PRIx64 " " "sh_addr: %#" PRIx64 " sh_offset: %#" PRIx64 "\n", __func__, (u64)sym.st_value, (u64)shdr.sh_addr, @@ -1944,7 +1945,7 @@ restart: ss.symshdr = ss.dynshdr; } - ret = dso__load_sym(dso, map, &ss, filter, 0); + ret = dso__load_sym(dso, map, &ss, &ss, filter, 0); /* * Some people seem to have debuginfo files _WITHOUT_ debug @@ -2249,7 +2250,7 @@ int dso__load_vmlinux(struct dso *dso, struct map *map, if (symsrc__init(&ss, dso, symfs_vmlinux, symtab_type)) return -1; - err = dso__load_sym(dso, map, &ss, filter, 0); + err = dso__load_sym(dso, map, &ss, &ss, filter, 0); symsrc__destroy(&ss); if (err > 0) { -- 1.7.11.3 -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/