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perf tools: Add util/debuginfo.[ch] files
Split debuginfo data structure and related functions into a separate file so that it can be used by other components than the probe-finder. Signed-off-by: Namhyung Kim <namhyung@kernel.org> Cc: Adrian Hunter <adrian.hunter@intel.com> Cc: Andi Kleen <ak@linux.intel.com> Cc: Ian Rogers <irogers@google.com> Cc: Ingo Molnar <mingo@kernel.org> Cc: Jiri Olsa <jolsa@kernel.org> Cc: Linus Torvalds <torvalds@linux-foundation.org> Cc: Masami Hiramatsu (Google) <mhiramat@kernel.org> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Stephane Eranian <eranian@google.com> Cc: linux-toolchains@vger.kernel.org Cc: linux-trace-devel@vger.kernel.org Link: https://lore.kernel.org/r/20231110000012.3538610-4-namhyung@kernel.org Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
This commit is contained in:
Namhyung Kim
Arnaldo Carvalho de Melo
parent
fb7fd2a14a
commit
6f1b6291cf
@ -195,6 +195,7 @@ endif
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perf-$(CONFIG_DWARF) += probe-finder.o
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perf-$(CONFIG_DWARF) += dwarf-aux.o
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perf-$(CONFIG_DWARF) += dwarf-regs.o
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perf-$(CONFIG_DWARF) += debuginfo.o
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perf-$(CONFIG_LIBDW_DWARF_UNWIND) += unwind-libdw.o
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perf-$(CONFIG_LOCAL_LIBUNWIND) += unwind-libunwind-local.o
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205
tools/perf/util/debuginfo.c
Normal file
205
tools/perf/util/debuginfo.c
Normal file
@ -0,0 +1,205 @@
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// SPDX-License-Identifier: GPL-2.0-or-later
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/*
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* DWARF debug information handling code. Copied from probe-finder.c.
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*
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* Written by Masami Hiramatsu <mhiramat@redhat.com>
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*/
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#include <errno.h>
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#include <fcntl.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <unistd.h>
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#include <linux/zalloc.h>
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#include "build-id.h"
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#include "dso.h"
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#include "debug.h"
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#include "debuginfo.h"
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#include "symbol.h"
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#ifdef HAVE_DEBUGINFOD_SUPPORT
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#include <elfutils/debuginfod.h>
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#endif
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/* Dwarf FL wrappers */
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static char *debuginfo_path; /* Currently dummy */
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static const Dwfl_Callbacks offline_callbacks = {
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.find_debuginfo = dwfl_standard_find_debuginfo,
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.debuginfo_path = &debuginfo_path,
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.section_address = dwfl_offline_section_address,
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/* We use this table for core files too. */
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.find_elf = dwfl_build_id_find_elf,
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};
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/* Get a Dwarf from offline image */
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static int debuginfo__init_offline_dwarf(struct debuginfo *dbg,
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const char *path)
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{
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GElf_Addr dummy;
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int fd;
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fd = open(path, O_RDONLY);
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if (fd < 0)
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return fd;
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dbg->dwfl = dwfl_begin(&offline_callbacks);
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if (!dbg->dwfl)
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goto error;
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dwfl_report_begin(dbg->dwfl);
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dbg->mod = dwfl_report_offline(dbg->dwfl, "", "", fd);
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if (!dbg->mod)
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goto error;
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dbg->dbg = dwfl_module_getdwarf(dbg->mod, &dbg->bias);
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if (!dbg->dbg)
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goto error;
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dwfl_module_build_id(dbg->mod, &dbg->build_id, &dummy);
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dwfl_report_end(dbg->dwfl, NULL, NULL);
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return 0;
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error:
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if (dbg->dwfl)
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dwfl_end(dbg->dwfl);
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else
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close(fd);
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memset(dbg, 0, sizeof(*dbg));
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return -ENOENT;
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}
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static struct debuginfo *__debuginfo__new(const char *path)
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{
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struct debuginfo *dbg = zalloc(sizeof(*dbg));
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if (!dbg)
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return NULL;
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if (debuginfo__init_offline_dwarf(dbg, path) < 0)
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zfree(&dbg);
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if (dbg)
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pr_debug("Open Debuginfo file: %s\n", path);
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return dbg;
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}
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enum dso_binary_type distro_dwarf_types[] = {
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DSO_BINARY_TYPE__FEDORA_DEBUGINFO,
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DSO_BINARY_TYPE__UBUNTU_DEBUGINFO,
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DSO_BINARY_TYPE__OPENEMBEDDED_DEBUGINFO,
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DSO_BINARY_TYPE__BUILDID_DEBUGINFO,
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DSO_BINARY_TYPE__MIXEDUP_UBUNTU_DEBUGINFO,
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DSO_BINARY_TYPE__NOT_FOUND,
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};
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struct debuginfo *debuginfo__new(const char *path)
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{
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enum dso_binary_type *type;
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char buf[PATH_MAX], nil = '\0';
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struct dso *dso;
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struct debuginfo *dinfo = NULL;
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struct build_id bid;
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/* Try to open distro debuginfo files */
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dso = dso__new(path);
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if (!dso)
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goto out;
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/* Set the build id for DSO_BINARY_TYPE__BUILDID_DEBUGINFO */
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if (is_regular_file(path) && filename__read_build_id(path, &bid) > 0)
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dso__set_build_id(dso, &bid);
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for (type = distro_dwarf_types;
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!dinfo && *type != DSO_BINARY_TYPE__NOT_FOUND;
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type++) {
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if (dso__read_binary_type_filename(dso, *type, &nil,
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buf, PATH_MAX) < 0)
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continue;
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dinfo = __debuginfo__new(buf);
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}
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dso__put(dso);
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out:
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/* if failed to open all distro debuginfo, open given binary */
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return dinfo ? : __debuginfo__new(path);
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}
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void debuginfo__delete(struct debuginfo *dbg)
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{
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if (dbg) {
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if (dbg->dwfl)
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dwfl_end(dbg->dwfl);
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free(dbg);
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}
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}
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/* For the kernel module, we need a special code to get a DIE */
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int debuginfo__get_text_offset(struct debuginfo *dbg, Dwarf_Addr *offs,
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bool adjust_offset)
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{
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int n, i;
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Elf32_Word shndx;
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Elf_Scn *scn;
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Elf *elf;
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GElf_Shdr mem, *shdr;
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const char *p;
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elf = dwfl_module_getelf(dbg->mod, &dbg->bias);
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if (!elf)
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return -EINVAL;
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/* Get the number of relocations */
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n = dwfl_module_relocations(dbg->mod);
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if (n < 0)
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return -ENOENT;
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/* Search the relocation related .text section */
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for (i = 0; i < n; i++) {
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p = dwfl_module_relocation_info(dbg->mod, i, &shndx);
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if (strcmp(p, ".text") == 0) {
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/* OK, get the section header */
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scn = elf_getscn(elf, shndx);
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if (!scn)
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return -ENOENT;
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shdr = gelf_getshdr(scn, &mem);
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if (!shdr)
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return -ENOENT;
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*offs = shdr->sh_addr;
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if (adjust_offset)
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*offs -= shdr->sh_offset;
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}
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}
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return 0;
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}
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#ifdef HAVE_DEBUGINFOD_SUPPORT
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int get_source_from_debuginfod(const char *raw_path,
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const char *sbuild_id, char **new_path)
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{
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debuginfod_client *c = debuginfod_begin();
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const char *p = raw_path;
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int fd;
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if (!c)
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return -ENOMEM;
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fd = debuginfod_find_source(c, (const unsigned char *)sbuild_id,
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0, p, new_path);
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pr_debug("Search %s from debuginfod -> %d\n", p, fd);
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if (fd >= 0)
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close(fd);
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debuginfod_end(c);
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if (fd < 0) {
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pr_debug("Failed to find %s in debuginfod (%s)\n",
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raw_path, sbuild_id);
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return -ENOENT;
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}
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pr_debug("Got a source %s\n", *new_path);
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return 0;
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}
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#endif /* HAVE_DEBUGINFOD_SUPPORT */
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64
tools/perf/util/debuginfo.h
Normal file
64
tools/perf/util/debuginfo.h
Normal file
@ -0,0 +1,64 @@
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/* SPDX-License-Identifier: GPL-2.0-or-later */
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#ifndef _PERF_DEBUGINFO_H
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#define _PERF_DEBUGINFO_H
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#include <errno.h>
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#include <linux/compiler.h>
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#ifdef HAVE_DWARF_SUPPORT
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#include "dwarf-aux.h"
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/* debug information structure */
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struct debuginfo {
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Dwarf *dbg;
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Dwfl_Module *mod;
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Dwfl *dwfl;
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Dwarf_Addr bias;
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const unsigned char *build_id;
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};
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/* This also tries to open distro debuginfo */
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struct debuginfo *debuginfo__new(const char *path);
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void debuginfo__delete(struct debuginfo *dbg);
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int debuginfo__get_text_offset(struct debuginfo *dbg, Dwarf_Addr *offs,
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bool adjust_offset);
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#else /* HAVE_DWARF_SUPPORT */
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/* dummy debug information structure */
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struct debuginfo {
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};
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static inline struct debuginfo *debuginfo__new(const char *path __maybe_unused)
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{
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return NULL;
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}
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static inline void debuginfo__delete(struct debuginfo *dbg __maybe_unused)
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{
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}
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static inline int debuginfo__get_text_offset(struct debuginfo *dbg __maybe_unused,
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Dwarf_Addr *offs __maybe_unused,
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bool adjust_offset __maybe_unused)
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{
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return -EINVAL;
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}
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#endif /* HAVE_DWARF_SUPPORT */
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#ifdef HAVE_DEBUGINFOD_SUPPORT
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int get_source_from_debuginfod(const char *raw_path, const char *sbuild_id,
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char **new_path);
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#else /* HAVE_DEBUGINFOD_SUPPORT */
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static inline int get_source_from_debuginfod(const char *raw_path __maybe_unused,
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const char *sbuild_id __maybe_unused,
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char **new_path __maybe_unused)
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{
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return -ENOTSUP;
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}
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#endif /* HAVE_DEBUGINFOD_SUPPORT */
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#endif /* _PERF_DEBUGINFO_H */
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@ -23,6 +23,7 @@
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#include "event.h"
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#include "dso.h"
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#include "debug.h"
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#include "debuginfo.h"
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#include "intlist.h"
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#include "strbuf.h"
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#include "strlist.h"
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@ -31,128 +32,9 @@
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#include "probe-file.h"
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#include "string2.h"
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#ifdef HAVE_DEBUGINFOD_SUPPORT
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#include <elfutils/debuginfod.h>
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#endif
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/* Kprobe tracer basic type is up to u64 */
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#define MAX_BASIC_TYPE_BITS 64
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/* Dwarf FL wrappers */
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static char *debuginfo_path; /* Currently dummy */
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static const Dwfl_Callbacks offline_callbacks = {
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.find_debuginfo = dwfl_standard_find_debuginfo,
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.debuginfo_path = &debuginfo_path,
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.section_address = dwfl_offline_section_address,
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/* We use this table for core files too. */
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.find_elf = dwfl_build_id_find_elf,
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};
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/* Get a Dwarf from offline image */
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static int debuginfo__init_offline_dwarf(struct debuginfo *dbg,
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const char *path)
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{
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GElf_Addr dummy;
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int fd;
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fd = open(path, O_RDONLY);
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if (fd < 0)
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return fd;
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dbg->dwfl = dwfl_begin(&offline_callbacks);
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if (!dbg->dwfl)
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goto error;
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dwfl_report_begin(dbg->dwfl);
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dbg->mod = dwfl_report_offline(dbg->dwfl, "", "", fd);
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if (!dbg->mod)
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goto error;
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dbg->dbg = dwfl_module_getdwarf(dbg->mod, &dbg->bias);
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if (!dbg->dbg)
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goto error;
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dwfl_module_build_id(dbg->mod, &dbg->build_id, &dummy);
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dwfl_report_end(dbg->dwfl, NULL, NULL);
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return 0;
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error:
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if (dbg->dwfl)
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dwfl_end(dbg->dwfl);
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else
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close(fd);
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memset(dbg, 0, sizeof(*dbg));
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return -ENOENT;
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}
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static struct debuginfo *__debuginfo__new(const char *path)
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{
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struct debuginfo *dbg = zalloc(sizeof(*dbg));
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if (!dbg)
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return NULL;
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if (debuginfo__init_offline_dwarf(dbg, path) < 0)
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zfree(&dbg);
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if (dbg)
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pr_debug("Open Debuginfo file: %s\n", path);
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return dbg;
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}
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enum dso_binary_type distro_dwarf_types[] = {
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DSO_BINARY_TYPE__FEDORA_DEBUGINFO,
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DSO_BINARY_TYPE__UBUNTU_DEBUGINFO,
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DSO_BINARY_TYPE__OPENEMBEDDED_DEBUGINFO,
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DSO_BINARY_TYPE__BUILDID_DEBUGINFO,
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DSO_BINARY_TYPE__MIXEDUP_UBUNTU_DEBUGINFO,
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DSO_BINARY_TYPE__NOT_FOUND,
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};
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struct debuginfo *debuginfo__new(const char *path)
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{
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enum dso_binary_type *type;
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char buf[PATH_MAX], nil = '\0';
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struct dso *dso;
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struct debuginfo *dinfo = NULL;
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struct build_id bid;
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/* Try to open distro debuginfo files */
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dso = dso__new(path);
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if (!dso)
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goto out;
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/* Set the build id for DSO_BINARY_TYPE__BUILDID_DEBUGINFO */
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if (is_regular_file(path) && filename__read_build_id(path, &bid) > 0)
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dso__set_build_id(dso, &bid);
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for (type = distro_dwarf_types;
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!dinfo && *type != DSO_BINARY_TYPE__NOT_FOUND;
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type++) {
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if (dso__read_binary_type_filename(dso, *type, &nil,
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buf, PATH_MAX) < 0)
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continue;
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dinfo = __debuginfo__new(buf);
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}
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dso__put(dso);
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out:
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/* if failed to open all distro debuginfo, open given binary */
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return dinfo ? : __debuginfo__new(path);
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}
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void debuginfo__delete(struct debuginfo *dbg)
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{
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if (dbg) {
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if (dbg->dwfl)
|
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dwfl_end(dbg->dwfl);
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free(dbg);
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}
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}
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/*
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* Probe finder related functions
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*/
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@ -1677,44 +1559,6 @@ int debuginfo__find_available_vars_at(struct debuginfo *dbg,
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return (ret < 0) ? ret : af.nvls;
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}
|
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|
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/* For the kernel module, we need a special code to get a DIE */
|
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int debuginfo__get_text_offset(struct debuginfo *dbg, Dwarf_Addr *offs,
|
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bool adjust_offset)
|
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{
|
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int n, i;
|
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Elf32_Word shndx;
|
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Elf_Scn *scn;
|
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Elf *elf;
|
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GElf_Shdr mem, *shdr;
|
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const char *p;
|
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|
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elf = dwfl_module_getelf(dbg->mod, &dbg->bias);
|
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if (!elf)
|
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return -EINVAL;
|
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|
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/* Get the number of relocations */
|
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n = dwfl_module_relocations(dbg->mod);
|
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if (n < 0)
|
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return -ENOENT;
|
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/* Search the relocation related .text section */
|
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for (i = 0; i < n; i++) {
|
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p = dwfl_module_relocation_info(dbg->mod, i, &shndx);
|
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if (strcmp(p, ".text") == 0) {
|
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/* OK, get the section header */
|
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scn = elf_getscn(elf, shndx);
|
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if (!scn)
|
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return -ENOENT;
|
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shdr = gelf_getshdr(scn, &mem);
|
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if (!shdr)
|
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return -ENOENT;
|
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*offs = shdr->sh_addr;
|
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if (adjust_offset)
|
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*offs -= shdr->sh_offset;
|
||||
}
|
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}
|
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return 0;
|
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}
|
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|
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/* Reverse search */
|
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int debuginfo__find_probe_point(struct debuginfo *dbg, u64 addr,
|
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struct perf_probe_point *ppt)
|
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@ -2009,41 +1853,6 @@ found:
|
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return (ret < 0) ? ret : lf.found;
|
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}
|
||||
|
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#ifdef HAVE_DEBUGINFOD_SUPPORT
|
||||
/* debuginfod doesn't require the comp_dir but buildid is required */
|
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static int get_source_from_debuginfod(const char *raw_path,
|
||||
const char *sbuild_id, char **new_path)
|
||||
{
|
||||
debuginfod_client *c = debuginfod_begin();
|
||||
const char *p = raw_path;
|
||||
int fd;
|
||||
|
||||
if (!c)
|
||||
return -ENOMEM;
|
||||
|
||||
fd = debuginfod_find_source(c, (const unsigned char *)sbuild_id,
|
||||
0, p, new_path);
|
||||
pr_debug("Search %s from debuginfod -> %d\n", p, fd);
|
||||
if (fd >= 0)
|
||||
close(fd);
|
||||
debuginfod_end(c);
|
||||
if (fd < 0) {
|
||||
pr_debug("Failed to find %s in debuginfod (%s)\n",
|
||||
raw_path, sbuild_id);
|
||||
return -ENOENT;
|
||||
}
|
||||
pr_debug("Got a source %s\n", *new_path);
|
||||
|
||||
return 0;
|
||||
}
|
||||
#else
|
||||
static inline int get_source_from_debuginfod(const char *raw_path __maybe_unused,
|
||||
const char *sbuild_id __maybe_unused,
|
||||
char **new_path __maybe_unused)
|
||||
{
|
||||
return -ENOTSUP;
|
||||
}
|
||||
#endif
|
||||
/*
|
||||
* Find a src file from a DWARF tag path. Prepend optional source path prefix
|
||||
* and chop off leading directories that do not exist. Result is passed back as
|
||||
|
||||
@ -24,21 +24,7 @@ static inline int is_c_varname(const char *name)
|
||||
#ifdef HAVE_DWARF_SUPPORT
|
||||
|
||||
#include "dwarf-aux.h"
|
||||
|
||||
/* TODO: export debuginfo data structure even if no dwarf support */
|
||||
|
||||
/* debug information structure */
|
||||
struct debuginfo {
|
||||
Dwarf *dbg;
|
||||
Dwfl_Module *mod;
|
||||
Dwfl *dwfl;
|
||||
Dwarf_Addr bias;
|
||||
const unsigned char *build_id;
|
||||
};
|
||||
|
||||
/* This also tries to open distro debuginfo */
|
||||
struct debuginfo *debuginfo__new(const char *path);
|
||||
void debuginfo__delete(struct debuginfo *dbg);
|
||||
#include "debuginfo.h"
|
||||
|
||||
/* Find probe_trace_events specified by perf_probe_event from debuginfo */
|
||||
int debuginfo__find_trace_events(struct debuginfo *dbg,
|
||||
@ -49,9 +35,6 @@ int debuginfo__find_trace_events(struct debuginfo *dbg,
|
||||
int debuginfo__find_probe_point(struct debuginfo *dbg, u64 addr,
|
||||
struct perf_probe_point *ppt);
|
||||
|
||||
int debuginfo__get_text_offset(struct debuginfo *dbg, Dwarf_Addr *offs,
|
||||
bool adjust_offset);
|
||||
|
||||
/* Find a line range */
|
||||
int debuginfo__find_line_range(struct debuginfo *dbg, struct line_range *lr);
|
||||
|
||||
|
||||
Loading…
Reference in New Issue
Block a user