perf probe: Introduce debuginfo to encapsulate dwarf information
Introduce debuginfo to encapsulate dwarf information. This new object allows us to reuse and expand debuginfo easily. Signed-off-by: Masami Hiramatsu <masami.hiramatsu.pt@hitachi.com> Cc: Peter Zijlstra <a.p.zijlstra@chello.nl> Cc: Frederic Weisbecker <fweisbec@gmail.com> Cc: Paul Mackerras <paulus@samba.org> Cc: Ingo Molnar <mingo@elte.hu> Cc: Arnaldo Carvalho de Melo <acme@ghostprotocols.net> Link: http://lkml.kernel.org/r/20110627072739.6528.12438.stgit@fedora15 Signed-off-by: Steven Rostedt <rostedt@goodmis.org>
This commit is contained in:
Masami Hiramatsu
Steven Rostedt
Родитель
e0d153c690
Коммит
ff74178350
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@ -170,16 +170,17 @@ const char *kernel_get_module_path(const char *module)
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}
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#ifdef DWARF_SUPPORT
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static int open_vmlinux(const char *module)
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/* Open new debuginfo of given module */
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static struct debuginfo *open_debuginfo(const char *module)
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{
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const char *path = kernel_get_module_path(module);
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if (!path) {
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pr_err("Failed to find path of %s module.\n",
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module ?: "kernel");
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return -ENOENT;
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return NULL;
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}
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pr_debug("Try to open %s\n", path);
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return open(path, O_RDONLY);
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return debuginfo__new(path);
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}
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/*
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@ -193,13 +194,24 @@ static int kprobe_convert_to_perf_probe(struct probe_trace_point *tp,
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struct map *map;
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u64 addr;
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int ret = -ENOENT;
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struct debuginfo *dinfo;
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sym = __find_kernel_function_by_name(tp->symbol, &map);
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if (sym) {
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addr = map->unmap_ip(map, sym->start + tp->offset);
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pr_debug("try to find %s+%ld@%" PRIx64 "\n", tp->symbol,
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tp->offset, addr);
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ret = find_perf_probe_point((unsigned long)addr, pp);
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dinfo = debuginfo__new_online_kernel(addr);
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if (dinfo) {
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ret = debuginfo__find_probe_point(dinfo,
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(unsigned long)addr, pp);
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debuginfo__delete(dinfo);
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} else {
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pr_debug("Failed to open debuginfo at 0x%" PRIx64 "\n",
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addr);
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ret = -ENOENT;
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}
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}
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if (ret <= 0) {
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pr_debug("Failed to find corresponding probes from "
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@ -220,20 +232,22 @@ static int try_to_find_probe_trace_events(struct perf_probe_event *pev,
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int max_tevs, const char *module)
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{
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bool need_dwarf = perf_probe_event_need_dwarf(pev);
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int fd, ntevs;
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struct debuginfo *dinfo = open_debuginfo(module);
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int ntevs;
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fd = open_vmlinux(module);
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if (fd < 0) {
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if (!dinfo) {
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if (need_dwarf) {
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pr_warning("Failed to open debuginfo file.\n");
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return fd;
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return -ENOENT;
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}
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pr_debug("Could not open vmlinux. Try to use symbols.\n");
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pr_debug("Could not open debuginfo. Try to use symbols.\n");
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return 0;
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}
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/* Searching trace events corresponding to probe event */
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ntevs = find_probe_trace_events(fd, pev, tevs, max_tevs);
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/* Searching trace events corresponding to a probe event */
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ntevs = debuginfo__find_trace_events(dinfo, pev, tevs, max_tevs);
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debuginfo__delete(dinfo);
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if (ntevs > 0) { /* Succeeded to find trace events */
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pr_debug("find %d probe_trace_events.\n", ntevs);
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@ -371,8 +385,9 @@ int show_line_range(struct line_range *lr, const char *module)
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{
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int l = 1;
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struct line_node *ln;
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struct debuginfo *dinfo;
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FILE *fp;
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int fd, ret;
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int ret;
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char *tmp;
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/* Search a line range */
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@ -380,13 +395,14 @@ int show_line_range(struct line_range *lr, const char *module)
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if (ret < 0)
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return ret;
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fd = open_vmlinux(module);
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if (fd < 0) {
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dinfo = open_debuginfo(module);
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if (!dinfo) {
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pr_warning("Failed to open debuginfo file.\n");
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return fd;
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return -ENOENT;
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}
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ret = find_line_range(fd, lr);
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ret = debuginfo__find_line_range(dinfo, lr);
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debuginfo__delete(dinfo);
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if (ret == 0) {
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pr_warning("Specified source line is not found.\n");
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return -ENOENT;
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@ -448,7 +464,8 @@ end:
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return ret;
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}
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static int show_available_vars_at(int fd, struct perf_probe_event *pev,
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static int show_available_vars_at(struct debuginfo *dinfo,
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struct perf_probe_event *pev,
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int max_vls, struct strfilter *_filter,
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bool externs)
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{
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@ -463,7 +480,8 @@ static int show_available_vars_at(int fd, struct perf_probe_event *pev,
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return -EINVAL;
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pr_debug("Searching variables at %s\n", buf);
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ret = find_available_vars_at(fd, pev, &vls, max_vls, externs);
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ret = debuginfo__find_available_vars_at(dinfo, pev, &vls,
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max_vls, externs);
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if (ret <= 0) {
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pr_err("Failed to find variables at %s (%d)\n", buf, ret);
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goto end;
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@ -504,24 +522,26 @@ int show_available_vars(struct perf_probe_event *pevs, int npevs,
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int max_vls, const char *module,
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struct strfilter *_filter, bool externs)
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{
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int i, fd, ret = 0;
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int i, ret = 0;
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struct debuginfo *dinfo;
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ret = init_vmlinux();
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if (ret < 0)
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return ret;
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dinfo = open_debuginfo(module);
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if (!dinfo) {
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pr_warning("Failed to open debuginfo file.\n");
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return -ENOENT;
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}
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setup_pager();
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for (i = 0; i < npevs && ret >= 0; i++) {
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fd = open_vmlinux(module);
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if (fd < 0) {
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pr_warning("Failed to open debug information file.\n");
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ret = fd;
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break;
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}
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ret = show_available_vars_at(fd, &pevs[i], max_vls, _filter,
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for (i = 0; i < npevs && ret >= 0; i++)
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ret = show_available_vars_at(dinfo, &pevs[i], max_vls, _filter,
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externs);
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}
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debuginfo__delete(dinfo);
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return ret;
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}
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@ -116,29 +116,37 @@ static const Dwfl_Callbacks offline_callbacks = {
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};
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/* Get a Dwarf from offline image */
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static Dwarf *dwfl_init_offline_dwarf(int fd, Dwfl **dwflp, Dwarf_Addr *bias)
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static int debuginfo__init_offline_dwarf(struct debuginfo *self,
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const char *path)
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{
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Dwfl_Module *mod;
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Dwarf *dbg = NULL;
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int fd;
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if (!dwflp)
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return NULL;
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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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*dwflp = dwfl_begin(&offline_callbacks);
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if (!*dwflp)
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return NULL;
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self->dwfl = dwfl_begin(&offline_callbacks);
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if (!self->dwfl)
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goto error;
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mod = dwfl_report_offline(*dwflp, "", "", fd);
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mod = dwfl_report_offline(self->dwfl, "", "", fd);
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if (!mod)
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goto error;
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dbg = dwfl_module_getdwarf(mod, bias);
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if (!dbg) {
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self->dbg = dwfl_module_getdwarf(mod, &self->bias);
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if (!self->dbg)
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goto error;
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return 0;
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error:
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dwfl_end(*dwflp);
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*dwflp = NULL;
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}
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return dbg;
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if (self->dwfl)
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dwfl_end(self->dwfl);
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else
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close(fd);
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memset(self, 0, sizeof(*self));
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return -ENOENT;
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}
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#if _ELFUTILS_PREREQ(0, 148)
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@ -174,54 +182,83 @@ static const Dwfl_Callbacks kernel_callbacks = {
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};
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/* Get a Dwarf from live kernel image */
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static Dwarf *dwfl_init_live_kernel_dwarf(Dwarf_Addr addr, Dwfl **dwflp,
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Dwarf_Addr *bias)
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static int debuginfo__init_online_kernel_dwarf(struct debuginfo *self,
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Dwarf_Addr addr)
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{
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Dwarf *dbg;
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if (!dwflp)
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return NULL;
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*dwflp = dwfl_begin(&kernel_callbacks);
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if (!*dwflp)
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return NULL;
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self->dwfl = dwfl_begin(&kernel_callbacks);
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if (!self->dwfl)
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return -EINVAL;
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/* Load the kernel dwarves: Don't care the result here */
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dwfl_linux_kernel_report_kernel(*dwflp);
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dwfl_linux_kernel_report_modules(*dwflp);
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dwfl_linux_kernel_report_kernel(self->dwfl);
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dwfl_linux_kernel_report_modules(self->dwfl);
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dbg = dwfl_addrdwarf(*dwflp, addr, bias);
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self->dbg = dwfl_addrdwarf(self->dwfl, addr, &self->bias);
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/* Here, check whether we could get a real dwarf */
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if (!dbg) {
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if (!self->dbg) {
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pr_debug("Failed to find kernel dwarf at %lx\n",
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(unsigned long)addr);
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dwfl_end(*dwflp);
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*dwflp = NULL;
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dwfl_end(self->dwfl);
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memset(self, 0, sizeof(*self));
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return -ENOENT;
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}
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return dbg;
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return 0;
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}
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#else
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/* With older elfutils, this just support kernel module... */
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static Dwarf *dwfl_init_live_kernel_dwarf(Dwarf_Addr addr __used, Dwfl **dwflp,
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Dwarf_Addr *bias)
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static int debuginfo__init_online_kernel_dwarf(struct debuginfo *self,
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Dwarf_Addr addr __used)
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{
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int fd;
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const char *path = kernel_get_module_path("kernel");
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if (!path) {
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pr_err("Failed to find vmlinux path\n");
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return NULL;
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return -ENOENT;
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}
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pr_debug2("Use file %s for debuginfo\n", path);
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fd = open(path, O_RDONLY);
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if (fd < 0)
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return NULL;
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return dwfl_init_offline_dwarf(fd, dwflp, bias);
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return debuginfo__init_offline_dwarf(self, path);
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}
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#endif
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struct debuginfo *debuginfo__new(const char *path)
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{
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struct debuginfo *self = zalloc(sizeof(struct debuginfo));
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if (!self)
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return NULL;
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if (debuginfo__init_offline_dwarf(self, path) < 0) {
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free(self);
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self = NULL;
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}
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return self;
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}
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struct debuginfo *debuginfo__new_online_kernel(unsigned long addr)
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{
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struct debuginfo *self = zalloc(sizeof(struct debuginfo));
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if (!self)
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return NULL;
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if (debuginfo__init_online_kernel_dwarf(self, (Dwarf_Addr)addr) < 0) {
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free(self);
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self = NULL;
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}
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return self;
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}
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void debuginfo__delete(struct debuginfo *self)
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{
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if (self) {
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if (self->dwfl)
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dwfl_end(self->dwfl);
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free(self);
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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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@ -949,28 +986,18 @@ static int pubname_search_cb(Dwarf *dbg, Dwarf_Global *gl, void *data)
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}
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/* Find probe points from debuginfo */
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static int find_probes(int fd, struct probe_finder *pf)
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static int debuginfo__find_probes(struct debuginfo *self,
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struct probe_finder *pf)
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{
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struct perf_probe_point *pp = &pf->pev->point;
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Dwarf_Off off, noff;
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size_t cuhl;
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Dwarf_Die *diep;
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Dwarf *dbg = NULL;
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Dwfl *dwfl;
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Dwarf_Addr bias; /* Currently ignored */
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int ret = 0;
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dbg = dwfl_init_offline_dwarf(fd, &dwfl, &bias);
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if (!dbg) {
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pr_warning("No debug information found in the vmlinux - "
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"please rebuild with CONFIG_DEBUG_INFO=y.\n");
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close(fd); /* Without dwfl_end(), fd isn't closed. */
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return -EBADF;
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}
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#if _ELFUTILS_PREREQ(0, 142)
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/* Get the call frame information from this dwarf */
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pf->cfi = dwarf_getcfi(dbg);
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pf->cfi = dwarf_getcfi(self->dbg);
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#endif
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off = 0;
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@ -989,7 +1016,8 @@ static int find_probes(int fd, struct probe_finder *pf)
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.data = pf,
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};
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dwarf_getpubnames(dbg, pubname_search_cb, &pubname_param, 0);
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dwarf_getpubnames(self->dbg, pubname_search_cb,
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&pubname_param, 0);
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if (pubname_param.found) {
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ret = probe_point_search_cb(&pf->sp_die, &probe_param);
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if (ret)
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@ -998,9 +1026,9 @@ static int find_probes(int fd, struct probe_finder *pf)
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}
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/* Loop on CUs (Compilation Unit) */
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while (!dwarf_nextcu(dbg, off, &noff, &cuhl, NULL, NULL, NULL)) {
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while (!dwarf_nextcu(self->dbg, off, &noff, &cuhl, NULL, NULL, NULL)) {
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/* Get the DIE(Debugging Information Entry) of this CU */
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diep = dwarf_offdie(dbg, off + cuhl, &pf->cu_die);
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diep = dwarf_offdie(self->dbg, off + cuhl, &pf->cu_die);
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if (!diep)
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continue;
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@ -1027,8 +1055,6 @@ static int find_probes(int fd, struct probe_finder *pf)
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|
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found:
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line_list__free(&pf->lcache);
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if (dwfl)
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dwfl_end(dwfl);
|
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|
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return ret;
|
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}
|
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|
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@ -1074,8 +1100,9 @@ static int add_probe_trace_event(Dwarf_Die *sp_die, struct probe_finder *pf)
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}
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/* Find probe_trace_events specified by perf_probe_event from debuginfo */
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int find_probe_trace_events(int fd, struct perf_probe_event *pev,
|
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struct probe_trace_event **tevs, int max_tevs)
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int debuginfo__find_trace_events(struct debuginfo *self,
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struct perf_probe_event *pev,
|
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struct probe_trace_event **tevs, int max_tevs)
|
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{
|
||||
struct trace_event_finder tf = {
|
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.pf = {.pev = pev, .callback = add_probe_trace_event},
|
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|
|
@ -1090,7 +1117,7 @@ int find_probe_trace_events(int fd, struct perf_probe_event *pev,
|
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tf.tevs = *tevs;
|
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tf.ntevs = 0;
|
||||
|
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ret = find_probes(fd, &tf.pf);
|
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ret = debuginfo__find_probes(self, &tf.pf);
|
||||
if (ret < 0) {
|
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free(*tevs);
|
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*tevs = NULL;
|
||||
|
|
@ -1184,9 +1211,10 @@ out:
|
|||
}
|
||||
|
||||
/* Find available variables at given probe point */
|
||||
int find_available_vars_at(int fd, struct perf_probe_event *pev,
|
||||
struct variable_list **vls, int max_vls,
|
||||
bool externs)
|
||||
int debuginfo__find_available_vars_at(struct debuginfo *self,
|
||||
struct perf_probe_event *pev,
|
||||
struct variable_list **vls,
|
||||
int max_vls, bool externs)
|
||||
{
|
||||
struct available_var_finder af = {
|
||||
.pf = {.pev = pev, .callback = add_available_vars},
|
||||
|
|
@ -1201,7 +1229,7 @@ int find_available_vars_at(int fd, struct perf_probe_event *pev,
|
|||
af.vls = *vls;
|
||||
af.nvls = 0;
|
||||
|
||||
ret = find_probes(fd, &af.pf);
|
||||
ret = debuginfo__find_probes(self, &af.pf);
|
||||
if (ret < 0) {
|
||||
/* Free vlist for error */
|
||||
while (af.nvls--) {
|
||||
|
|
@ -1219,28 +1247,19 @@ int find_available_vars_at(int fd, struct perf_probe_event *pev,
|
|||
}
|
||||
|
||||
/* Reverse search */
|
||||
int find_perf_probe_point(unsigned long addr, struct perf_probe_point *ppt)
|
||||
int debuginfo__find_probe_point(struct debuginfo *self, unsigned long addr,
|
||||
struct perf_probe_point *ppt)
|
||||
{
|
||||
Dwarf_Die cudie, spdie, indie;
|
||||
Dwarf *dbg = NULL;
|
||||
Dwfl *dwfl = NULL;
|
||||
Dwarf_Addr _addr, baseaddr, bias = 0;
|
||||
Dwarf_Addr _addr, baseaddr;
|
||||
const char *fname = NULL, *func = NULL, *tmp;
|
||||
int baseline = 0, lineno = 0, ret = 0;
|
||||
|
||||
/* Open the live linux kernel */
|
||||
dbg = dwfl_init_live_kernel_dwarf(addr, &dwfl, &bias);
|
||||
if (!dbg) {
|
||||
pr_warning("No debug information found in the vmlinux - "
|
||||
"please rebuild with CONFIG_DEBUG_INFO=y.\n");
|
||||
ret = -EINVAL;
|
||||
goto end;
|
||||
}
|
||||
|
||||
/* Adjust address with bias */
|
||||
addr += bias;
|
||||
addr += self->bias;
|
||||
|
||||
/* Find cu die */
|
||||
if (!dwarf_addrdie(dbg, (Dwarf_Addr)addr - bias, &cudie)) {
|
||||
if (!dwarf_addrdie(self->dbg, (Dwarf_Addr)addr - self->bias, &cudie)) {
|
||||
pr_warning("Failed to find debug information for address %lx\n",
|
||||
addr);
|
||||
ret = -EINVAL;
|
||||
|
|
@ -1316,8 +1335,6 @@ post:
|
|||
}
|
||||
}
|
||||
end:
|
||||
if (dwfl)
|
||||
dwfl_end(dwfl);
|
||||
if (ret == 0 && (fname || func))
|
||||
ret = 1; /* Found a point */
|
||||
return ret;
|
||||
|
|
@ -1427,26 +1444,15 @@ static int find_line_range_by_func(struct line_finder *lf)
|
|||
return param.retval;
|
||||
}
|
||||
|
||||
int find_line_range(int fd, struct line_range *lr)
|
||||
int debuginfo__find_line_range(struct debuginfo *self, struct line_range *lr)
|
||||
{
|
||||
struct line_finder lf = {.lr = lr, .found = 0};
|
||||
int ret = 0;
|
||||
Dwarf_Off off = 0, noff;
|
||||
size_t cuhl;
|
||||
Dwarf_Die *diep;
|
||||
Dwarf *dbg = NULL;
|
||||
Dwfl *dwfl;
|
||||
Dwarf_Addr bias; /* Currently ignored */
|
||||
const char *comp_dir;
|
||||
|
||||
dbg = dwfl_init_offline_dwarf(fd, &dwfl, &bias);
|
||||
if (!dbg) {
|
||||
pr_warning("No debug information found in the vmlinux - "
|
||||
"please rebuild with CONFIG_DEBUG_INFO=y.\n");
|
||||
close(fd); /* Without dwfl_end(), fd isn't closed. */
|
||||
return -EBADF;
|
||||
}
|
||||
|
||||
/* Fastpath: lookup by function name from .debug_pubnames section */
|
||||
if (lr->function) {
|
||||
struct pubname_callback_param pubname_param = {
|
||||
|
|
@ -1455,7 +1461,8 @@ int find_line_range(int fd, struct line_range *lr)
|
|||
struct dwarf_callback_param line_range_param = {
|
||||
.data = (void *)&lf, .retval = 0};
|
||||
|
||||
dwarf_getpubnames(dbg, pubname_search_cb, &pubname_param, 0);
|
||||
dwarf_getpubnames(self->dbg, pubname_search_cb,
|
||||
&pubname_param, 0);
|
||||
if (pubname_param.found) {
|
||||
line_range_search_cb(&lf.sp_die, &line_range_param);
|
||||
if (lf.found)
|
||||
|
|
@ -1465,11 +1472,12 @@ int find_line_range(int fd, struct line_range *lr)
|
|||
|
||||
/* Loop on CUs (Compilation Unit) */
|
||||
while (!lf.found && ret >= 0) {
|
||||
if (dwarf_nextcu(dbg, off, &noff, &cuhl, NULL, NULL, NULL) != 0)
|
||||
if (dwarf_nextcu(self->dbg, off, &noff, &cuhl,
|
||||
NULL, NULL, NULL) != 0)
|
||||
break;
|
||||
|
||||
/* Get the DIE(Debugging Information Entry) of this CU */
|
||||
diep = dwarf_offdie(dbg, off + cuhl, &lf.cu_die);
|
||||
diep = dwarf_offdie(self->dbg, off + cuhl, &lf.cu_die);
|
||||
if (!diep)
|
||||
continue;
|
||||
|
||||
|
|
@ -1503,7 +1511,6 @@ found:
|
|||
}
|
||||
|
||||
pr_debug("path: %s\n", lr->path);
|
||||
dwfl_end(dwfl);
|
||||
return (ret < 0) ? ret : lf.found;
|
||||
}
|
||||
|
||||
|
|
|
|||
|
|
@ -16,23 +16,42 @@ static inline int is_c_varname(const char *name)
|
|||
}
|
||||
|
||||
#ifdef DWARF_SUPPORT
|
||||
|
||||
#include "dwarf-aux.h"
|
||||
|
||||
/* TODO: export debuginfo data structure even if no dwarf support */
|
||||
|
||||
/* debug information structure */
|
||||
struct debuginfo {
|
||||
Dwarf *dbg;
|
||||
Dwfl *dwfl;
|
||||
Dwarf_Addr bias;
|
||||
};
|
||||
|
||||
extern struct debuginfo *debuginfo__new(const char *path);
|
||||
extern struct debuginfo *debuginfo__new_online_kernel(unsigned long addr);
|
||||
extern void debuginfo__delete(struct debuginfo *self);
|
||||
|
||||
/* Find probe_trace_events specified by perf_probe_event from debuginfo */
|
||||
extern int find_probe_trace_events(int fd, struct perf_probe_event *pev,
|
||||
struct probe_trace_event **tevs,
|
||||
int max_tevs);
|
||||
extern int debuginfo__find_trace_events(struct debuginfo *self,
|
||||
struct perf_probe_event *pev,
|
||||
struct probe_trace_event **tevs,
|
||||
int max_tevs);
|
||||
|
||||
/* Find a perf_probe_point from debuginfo */
|
||||
extern int find_perf_probe_point(unsigned long addr,
|
||||
struct perf_probe_point *ppt);
|
||||
extern int debuginfo__find_probe_point(struct debuginfo *self,
|
||||
unsigned long addr,
|
||||
struct perf_probe_point *ppt);
|
||||
|
||||
/* Find a line range */
|
||||
extern int find_line_range(int fd, struct line_range *lr);
|
||||
extern int debuginfo__find_line_range(struct debuginfo *self,
|
||||
struct line_range *lr);
|
||||
|
||||
/* Find available variables */
|
||||
extern int find_available_vars_at(int fd, struct perf_probe_event *pev,
|
||||
struct variable_list **vls, int max_points,
|
||||
bool externs);
|
||||
#include "dwarf-aux.h"
|
||||
extern int debuginfo__find_available_vars_at(struct debuginfo *self,
|
||||
struct perf_probe_event *pev,
|
||||
struct variable_list **vls,
|
||||
int max_points, bool externs);
|
||||
|
||||
struct probe_finder {
|
||||
struct perf_probe_event *pev; /* Target probe event */
|
||||
|
|
|
|||
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