--- /dev/null
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+
+#include <linux/kernel.h>
+
+#include "util/dso.h"
+#include "util/util.h"
+#include "util/debug.h"
+
+#include "symbol.h"
+
+#ifdef HAVE_LIBBFD_SUPPORT
+
+/*
+ * Implement addr2line using libbfd.
+ */
+#define PACKAGE "perf"
+#include <bfd.h>
+
+struct a2l_data {
+ const char *input;
+ u64 addr;
+
+ bool found;
+ const char *filename;
+ const char *funcname;
+ unsigned line;
+
+ bfd *abfd;
+ asymbol **syms;
+};
+
+static int bfd_error(const char *string)
+{
+ const char *errmsg;
+
+ errmsg = bfd_errmsg(bfd_get_error());
+ fflush(stdout);
+
+ if (string)
+ pr_debug("%s: %s\n", string, errmsg);
+ else
+ pr_debug("%s\n", errmsg);
+
+ return -1;
+}
+
+static int slurp_symtab(bfd *abfd, struct a2l_data *a2l)
+{
+ long storage;
+ long symcount;
+ asymbol **syms;
+ bfd_boolean dynamic = FALSE;
+
+ if ((bfd_get_file_flags(abfd) & HAS_SYMS) == 0)
+ return bfd_error(bfd_get_filename(abfd));
+
+ storage = bfd_get_symtab_upper_bound(abfd);
+ if (storage == 0L) {
+ storage = bfd_get_dynamic_symtab_upper_bound(abfd);
+ dynamic = TRUE;
+ }
+ if (storage < 0L)
+ return bfd_error(bfd_get_filename(abfd));
+
+ syms = malloc(storage);
+ if (dynamic)
+ symcount = bfd_canonicalize_dynamic_symtab(abfd, syms);
+ else
+ symcount = bfd_canonicalize_symtab(abfd, syms);
+
+ if (symcount < 0) {
+ free(syms);
+ return bfd_error(bfd_get_filename(abfd));
+ }
+
+ a2l->syms = syms;
+ return 0;
+}
+
+static void find_address_in_section(bfd *abfd, asection *section, void *data)
+{
+ bfd_vma pc, vma;
+ bfd_size_type size;
+ struct a2l_data *a2l = data;
+
+ if (a2l->found)
+ return;
+
+ if ((bfd_get_section_flags(abfd, section) & SEC_ALLOC) == 0)
+ return;
+
+ pc = a2l->addr;
+ vma = bfd_get_section_vma(abfd, section);
+ size = bfd_get_section_size(section);
+
+ if (pc < vma || pc >= vma + size)
+ return;
+
+ a2l->found = bfd_find_nearest_line(abfd, section, a2l->syms, pc - vma,
+ &a2l->filename, &a2l->funcname,
+ &a2l->line);
+}
+
+static struct a2l_data *addr2line_init(const char *path)
+{
+ bfd *abfd;
+ struct a2l_data *a2l = NULL;
+
+ abfd = bfd_openr(path, NULL);
+ if (abfd == NULL)
+ return NULL;
+
+ if (!bfd_check_format(abfd, bfd_object))
+ goto out;
+
+ a2l = zalloc(sizeof(*a2l));
+ if (a2l == NULL)
+ goto out;
+
+ a2l->abfd = abfd;
+ a2l->input = strdup(path);
+ if (a2l->input == NULL)
+ goto out;
+
+ if (slurp_symtab(abfd, a2l))
+ goto out;
+
+ return a2l;
+
+out:
+ if (a2l) {
+ zfree((char **)&a2l->input);
+ free(a2l);
+ }
+ bfd_close(abfd);
+ return NULL;
+}
+
+static void addr2line_cleanup(struct a2l_data *a2l)
+{
+ if (a2l->abfd)
+ bfd_close(a2l->abfd);
+ zfree((char **)&a2l->input);
+ zfree(&a2l->syms);
+ free(a2l);
+}
+
+static int addr2line(const char *dso_name, u64 addr,
+ char **file, unsigned int *line, struct dso *dso)
+{
+ int ret = 0;
+ struct a2l_data *a2l = dso->a2l;
+
+ if (!a2l) {
+ dso->a2l = addr2line_init(dso_name);
+ a2l = dso->a2l;
+ }
+
+ if (a2l == NULL) {
+ pr_warning("addr2line_init failed for %s\n", dso_name);
+ return 0;
+ }
+
+ a2l->addr = addr;
+ a2l->found = false;
+
+ bfd_map_over_sections(a2l->abfd, find_address_in_section, a2l);
+
+ if (a2l->found && a2l->filename) {
+ *file = strdup(a2l->filename);
+ *line = a2l->line;
+
+ if (*file)
+ ret = 1;
+ }
+
+ return ret;
+}
+
+void dso__free_a2l(struct dso *dso)
+{
+ struct a2l_data *a2l = dso->a2l;
+
+ if (!a2l)
+ return;
+
+ addr2line_cleanup(a2l);
+
+ dso->a2l = NULL;
+}
+
+#else /* HAVE_LIBBFD_SUPPORT */
+
+static int addr2line(const char *dso_name, u64 addr,
+ char **file, unsigned int *line_nr,
+ struct dso *dso __maybe_unused)
+{
+ FILE *fp;
+ char cmd[PATH_MAX];
+ char *filename = NULL;
+ size_t len;
+ char *sep;
+ int ret = 0;
+
+ scnprintf(cmd, sizeof(cmd), "addr2line -e %s %016"PRIx64,
+ dso_name, addr);
+
+ fp = popen(cmd, "r");
+ if (fp == NULL) {
+ pr_warning("popen failed for %s\n", dso_name);
+ return 0;
+ }
+
+ if (getline(&filename, &len, fp) < 0 || !len) {
+ pr_warning("addr2line has no output for %s\n", dso_name);
+ goto out;
+ }
+
+ sep = strchr(filename, '\n');
+ if (sep)
+ *sep = '\0';
+
+ if (!strcmp(filename, "??:0")) {
+ pr_debug("no debugging info in %s\n", dso_name);
+ free(filename);
+ goto out;
+ }
+
+ sep = strchr(filename, ':');
+ if (sep) {
+ *sep++ = '\0';
+ *file = filename;
+ *line_nr = strtoul(sep, NULL, 0);
+ ret = 1;
+ }
+out:
+ pclose(fp);
+ return ret;
+}
+
+void dso__free_a2l(struct dso *dso __maybe_unused)
+{
+}
+
+#endif /* HAVE_LIBBFD_SUPPORT */
+
+/*
+ * Number of addr2line failures (without success) before disabling it for that
+ * dso.
+ */
+#define A2L_FAIL_LIMIT 123
+
+char *get_srcline(struct dso *dso, u64 addr, struct symbol *sym,
+ bool show_sym)
+{
+ char *file = NULL;
+ unsigned line = 0;
+ char *srcline;
+ const char *dso_name;
+
+ if (!dso->has_srcline)
+ goto out;
+
+ if (dso->symsrc_filename)
+ dso_name = dso->symsrc_filename;
+ else
+ dso_name = dso->long_name;
+
+ if (dso_name[0] == '[')
+ goto out;
+
+ if (!strncmp(dso_name, "/tmp/perf-", 10))
+ goto out;
+
+ if (!addr2line(dso_name, addr, &file, &line, dso))
+ goto out;
+
+ if (asprintf(&srcline, "%s:%u", basename(file), line) < 0) {
+ free(file);
+ goto out;
+ }
+
+ dso->a2l_fails = 0;
+
+ free(file);
+ return srcline;
+
+out:
+ if (dso->a2l_fails && ++dso->a2l_fails > A2L_FAIL_LIMIT) {
+ dso->has_srcline = 0;
+ dso__free_a2l(dso);
+ }
+ if (sym) {
+ if (asprintf(&srcline, "%s+%" PRIu64, show_sym ? sym->name : "",
+ addr - sym->start) < 0)
+ return SRCLINE_UNKNOWN;
+ } else if (asprintf(&srcline, "%s[%" PRIx64 "]", dso->short_name, addr) < 0)
+ return SRCLINE_UNKNOWN;
+ return srcline;
+}
+
+void free_srcline(char *srcline)
+{
+ if (srcline && strcmp(srcline, SRCLINE_UNKNOWN) != 0)
+ free(srcline);
+}
Code Review / kvmfornfv.git / blobdiff