diff options
| -rw-r--r-- | tools/perf/util/probe-event.c | 40 | ||||
| -rw-r--r-- | tools/perf/util/probe-finder.c | 86 | ||||
| -rw-r--r-- | tools/perf/util/probe-finder.h | 1 |
3 files changed, 26 insertions, 101 deletions
diff --git a/tools/perf/util/probe-event.c b/tools/perf/util/probe-event.c index 1ce2cb9845b6..8e34c8d47813 100644 --- a/tools/perf/util/probe-event.c +++ b/tools/perf/util/probe-event.c @@ -248,6 +248,18 @@ static struct debuginfo *open_debuginfo(const char *module) return debuginfo__new(path); } +static struct ref_reloc_sym *__kernel_get_ref_reloc_sym(void) +{ + /* kmap->ref_reloc_sym should be set if host_machine is initialized */ + struct kmap *kmap; + + if (map__load(host_machine->vmlinux_maps[MAP__FUNCTION], NULL) < 0) + return NULL; + + kmap = map__kmap(host_machine->vmlinux_maps[MAP__FUNCTION]); + return kmap->ref_reloc_sym; +} + /* * Convert trace point to probe point with debuginfo * Currently only handles kprobes. @@ -256,18 +268,27 @@ static int kprobe_convert_to_perf_probe(struct probe_trace_point *tp, struct perf_probe_point *pp) { struct symbol *sym; + struct ref_reloc_sym *reloc_sym; struct map *map; - u64 addr; + u64 addr = 0; int ret = -ENOENT; struct debuginfo *dinfo; - sym = __find_kernel_function_by_name(tp->symbol, &map); - if (sym) { - addr = map->unmap_ip(map, sym->start + tp->offset); + /* ref_reloc_sym is just a label. Need a special fix*/ + reloc_sym = __kernel_get_ref_reloc_sym(); + if (reloc_sym && strcmp(tp->symbol, reloc_sym->name) == 0) + addr = reloc_sym->unrelocated_addr + tp->offset; + else { + sym = __find_kernel_function_by_name(tp->symbol, &map); + if (sym) + addr = map->unmap_ip(map, sym->start + tp->offset) - + map->reloc; + } + if (addr) { pr_debug("try to find %s+%ld@%" PRIx64 "\n", tp->symbol, tp->offset, addr); - dinfo = debuginfo__new_online_kernel(addr); + dinfo = open_debuginfo(tp->module); if (dinfo) { ret = debuginfo__find_probe_point(dinfo, (unsigned long)addr, pp); @@ -383,15 +404,6 @@ static int add_module_to_probe_trace_events(struct probe_trace_event *tevs, return ret; } -static struct ref_reloc_sym *__kernel_get_ref_reloc_sym(void) -{ - /* kmap->ref_reloc_sym should be set if host_machine is initialized */ - struct kmap *kmap; - - kmap = map__kmap(host_machine->vmlinux_maps[MAP__FUNCTION]); - return kmap->ref_reloc_sym; -} - /* Post processing the probe events */ static int post_process_probe_trace_events(struct probe_trace_event *tevs, int ntevs, const char *module, diff --git a/tools/perf/util/probe-finder.c b/tools/perf/util/probe-finder.c index e5e589fdef9b..4f6e277c457c 100644 --- a/tools/perf/util/probe-finder.c +++ b/tools/perf/util/probe-finder.c @@ -89,79 +89,6 @@ error: return -ENOENT; } -#if _ELFUTILS_PREREQ(0, 148) -/* This method is buggy if elfutils is older than 0.148 */ -static int __linux_kernel_find_elf(Dwfl_Module *mod, - void **userdata, - const char *module_name, - Dwarf_Addr base, - char **file_name, Elf **elfp) -{ - int fd; - const char *path = kernel_get_module_path(module_name); - - pr_debug2("Use file %s for %s\n", path, module_name); - if (path) { - fd = open(path, O_RDONLY); - if (fd >= 0) { - *file_name = strdup(path); - return fd; - } - } - /* If failed, try to call standard method */ - return dwfl_linux_kernel_find_elf(mod, userdata, module_name, base, - file_name, elfp); -} - -static const Dwfl_Callbacks kernel_callbacks = { - .find_debuginfo = dwfl_standard_find_debuginfo, - .debuginfo_path = &debuginfo_path, - - .find_elf = __linux_kernel_find_elf, - .section_address = dwfl_linux_kernel_module_section_address, -}; - -/* Get a Dwarf from live kernel image */ -static int debuginfo__init_online_kernel_dwarf(struct debuginfo *dbg, - Dwarf_Addr addr) -{ - dbg->dwfl = dwfl_begin(&kernel_callbacks); - if (!dbg->dwfl) - return -EINVAL; - - /* Load the kernel dwarves: Don't care the result here */ - dwfl_linux_kernel_report_kernel(dbg->dwfl); - dwfl_linux_kernel_report_modules(dbg->dwfl); - - dbg->dbg = dwfl_addrdwarf(dbg->dwfl, addr, &dbg->bias); - /* Here, check whether we could get a real dwarf */ - if (!dbg->dbg) { - pr_debug("Failed to find kernel dwarf at %lx\n", - (unsigned long)addr); - dwfl_end(dbg->dwfl); - memset(dbg, 0, sizeof(*dbg)); - return -ENOENT; - } - - return 0; -} -#else -/* With older elfutils, this just support kernel module... */ -static int debuginfo__init_online_kernel_dwarf(struct debuginfo *dbg, - Dwarf_Addr addr __maybe_unused) -{ - const char *path = kernel_get_module_path("kernel"); - - if (!path) { - pr_err("Failed to find vmlinux path\n"); - return -ENOENT; - } - - pr_debug2("Use file %s for debuginfo\n", path); - return debuginfo__init_offline_dwarf(dbg, path); -} -#endif - struct debuginfo *debuginfo__new(const char *path) { struct debuginfo *dbg = zalloc(sizeof(*dbg)); @@ -174,19 +101,6 @@ struct debuginfo *debuginfo__new(const char *path) return dbg; } -struct debuginfo *debuginfo__new_online_kernel(unsigned long addr) -{ - struct debuginfo *dbg = zalloc(sizeof(*dbg)); - - if (!dbg) - return NULL; - - if (debuginfo__init_online_kernel_dwarf(dbg, (Dwarf_Addr)addr) < 0) - zfree(&dbg); - - return dbg; -} - void debuginfo__delete(struct debuginfo *dbg) { if (dbg) { diff --git a/tools/perf/util/probe-finder.h b/tools/perf/util/probe-finder.h index 592c4dac3be9..3fc597365ce6 100644 --- a/tools/perf/util/probe-finder.h +++ b/tools/perf/util/probe-finder.h @@ -31,7 +31,6 @@ struct debuginfo { }; extern struct debuginfo *debuginfo__new(const char *path); -extern struct debuginfo *debuginfo__new_online_kernel(unsigned long addr); extern void debuginfo__delete(struct debuginfo *dbg); /* Find probe_trace_events specified by perf_probe_event from debuginfo */ |