--- /dev/null
+/*
+ * Backtrace debugging
+ * Copyright (c) 2009, Jouni Malinen <j@w1.fi>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ *
+ * Alternatively, this software may be distributed under the terms of BSD
+ * license.
+ *
+ * See README and COPYING for more details.
+ */
+
+#include "includes.h"
+
+#include "common.h"
+#include "trace.h"
+
+#ifdef WPA_TRACE
+
+static struct dl_list active_references =
+{ &active_references, &active_references };
+
+#ifdef WPA_TRACE_BFD
+#include <bfd.h>
+#ifdef __linux__
+#include <demangle.h>
+#else /* __linux__ */
+#include <libiberty/demangle.h>
+#endif /* __linux__ */
+
+static char *prg_fname = NULL;
+static bfd *cached_abfd = NULL;
+static asymbol **syms = NULL;
+
+static void get_prg_fname(void)
+{
+ char exe[50], fname[512];
+ int len;
+ os_snprintf(exe, sizeof(exe) - 1, "/proc/%u/exe", getpid());
+ len = readlink(exe, fname, sizeof(fname) - 1);
+ if (len < 0 || len >= (int) sizeof(fname)) {
+ perror("readlink");
+ return;
+ }
+ fname[len] = '\0';
+ prg_fname = strdup(fname);
+}
+
+
+static bfd * open_bfd(const char *fname)
+{
+ bfd *abfd;
+ char **matching;
+
+ abfd = bfd_openr(prg_fname, NULL);
+ if (abfd == NULL) {
+ wpa_printf(MSG_INFO, "bfd_openr failed");
+ return NULL;
+ }
+
+ if (bfd_check_format(abfd, bfd_archive)) {
+ wpa_printf(MSG_INFO, "bfd_check_format failed");
+ bfd_close(abfd);
+ return NULL;
+ }
+
+ if (!bfd_check_format_matches(abfd, bfd_object, &matching)) {
+ wpa_printf(MSG_INFO, "bfd_check_format_matches failed");
+ free(matching);
+ bfd_close(abfd);
+ return NULL;
+ }
+
+ return abfd;
+}
+
+
+static void read_syms(bfd *abfd)
+{
+ long storage, symcount;
+ bfd_boolean dynamic = FALSE;
+
+ if (syms)
+ return;
+
+ if (!(bfd_get_file_flags(abfd) & HAS_SYMS)) {
+ wpa_printf(MSG_INFO, "No symbols");
+ return;
+ }
+
+ storage = bfd_get_symtab_upper_bound(abfd);
+ if (storage == 0) {
+ storage = bfd_get_dynamic_symtab_upper_bound(abfd);
+ dynamic = TRUE;
+ }
+ if (storage < 0) {
+ wpa_printf(MSG_INFO, "Unknown symtab upper bound");
+ return;
+ }
+
+ syms = malloc(storage);
+ if (syms == NULL) {
+ wpa_printf(MSG_INFO, "Failed to allocate memory for symtab "
+ "(%ld bytes)", storage);
+ return;
+ }
+ if (dynamic)
+ symcount = bfd_canonicalize_dynamic_symtab(abfd, syms);
+ else
+ symcount = bfd_canonicalize_symtab(abfd, syms);
+ if (symcount < 0) {
+ wpa_printf(MSG_INFO, "Failed to canonicalize %ssymtab",
+ dynamic ? "dynamic " : "");
+ free(syms);
+ syms = NULL;
+ return;
+ }
+}
+
+
+struct bfd_data {
+ bfd_vma pc;
+ bfd_boolean found;
+ const char *filename;
+ const char *function;
+ unsigned int line;
+};
+
+
+static void find_addr_sect(bfd *abfd, asection *section, void *obj)
+{
+ struct bfd_data *data = obj;
+ bfd_vma vma;
+ bfd_size_type size;
+
+ if (data->found)
+ return;
+
+ if (!(bfd_get_section_vma(abfd, section)))
+ return;
+
+ vma = bfd_get_section_vma(abfd, section);
+ if (data->pc < vma)
+ return;
+
+ size = bfd_get_section_size(section);
+ if (data->pc >= vma + size)
+ return;
+
+ data->found = bfd_find_nearest_line(abfd, section, syms,
+ data->pc - vma,
+ &data->filename,
+ &data->function,
+ &data->line);
+}
+
+
+static void wpa_trace_bfd_addr(void *pc)
+{
+ bfd *abfd = cached_abfd;
+ struct bfd_data data;
+ const char *name;
+ char *aname = NULL;
+ const char *filename;
+
+ if (abfd == NULL)
+ return;
+
+ data.pc = (bfd_vma) pc;
+ data.found = FALSE;
+ bfd_map_over_sections(abfd, find_addr_sect, &data);
+
+ if (!data.found)
+ return;
+
+ do {
+ if (data.function)
+ aname = bfd_demangle(abfd, data.function,
+ DMGL_ANSI | DMGL_PARAMS);
+ name = aname ? aname : data.function;
+ filename = data.filename;
+ if (filename) {
+ char *end = os_strrchr(filename, '/');
+ int i = 0;
+ while (*filename && *filename == prg_fname[i] &&
+ filename <= end) {
+ filename++;
+ i++;
+ }
+ }
+ wpa_printf(MSG_INFO, " %s() %s:%u",
+ name, filename, data.line);
+ free(aname);
+
+ data.found = bfd_find_inliner_info(abfd, &data.filename,
+ &data.function, &data.line);
+ } while (data.found);
+}
+
+
+static const char * wpa_trace_bfd_addr2func(void *pc)
+{
+ bfd *abfd = cached_abfd;
+ struct bfd_data data;
+
+ if (abfd == NULL)
+ return NULL;
+
+ data.pc = (bfd_vma) pc;
+ data.found = FALSE;
+ bfd_map_over_sections(abfd, find_addr_sect, &data);
+
+ if (!data.found)
+ return NULL;
+
+ return data.function;
+}
+
+
+static void wpa_trace_bfd_init(void)
+{
+ if (!prg_fname) {
+ get_prg_fname();
+ if (!prg_fname)
+ return;
+ }
+
+ if (!cached_abfd) {
+ cached_abfd = open_bfd(prg_fname);
+ if (!cached_abfd) {
+ wpa_printf(MSG_INFO, "Failed to open bfd");
+ return;
+ }
+ }
+
+ read_syms(cached_abfd);
+ if (!syms) {
+ wpa_printf(MSG_INFO, "Failed to read symbols");
+ return;
+ }
+}
+
+
+void wpa_trace_dump_funcname(const char *title, void *pc)
+{
+ wpa_printf(MSG_INFO, "WPA_TRACE: %s: %p", title, pc);
+ wpa_trace_bfd_init();
+ wpa_trace_bfd_addr(pc);
+}
+
+#else /* WPA_TRACE_BFD */
+
+#define wpa_trace_bfd_init() do { } while (0)
+#define wpa_trace_bfd_addr(pc) do { } while (0)
+#define wpa_trace_bfd_addr2func(pc) NULL
+
+#endif /* WPA_TRACE_BFD */
+
+void wpa_trace_dump_func(const char *title, void **btrace, int btrace_num)
+{
+ char **sym;
+ int i;
+ enum { TRACE_HEAD, TRACE_RELEVANT, TRACE_TAIL } state;
+
+ wpa_trace_bfd_init();
+ wpa_printf(MSG_INFO, "WPA_TRACE: %s - START", title);
+ sym = backtrace_symbols(btrace, btrace_num);
+ state = TRACE_HEAD;
+ for (i = 0; i < btrace_num; i++) {
+ const char *func = wpa_trace_bfd_addr2func(btrace[i]);
+ if (state == TRACE_HEAD && func &&
+ (os_strcmp(func, "wpa_trace_add_ref_func") == 0 ||
+ os_strcmp(func, "wpa_trace_check_ref") == 0 ||
+ os_strcmp(func, "wpa_trace_show") == 0))
+ continue;
+ if (state == TRACE_TAIL && sym && sym[i] &&
+ os_strstr(sym[i], "__libc_start_main"))
+ break;
+ if (state == TRACE_HEAD)
+ state = TRACE_RELEVANT;
+ if (sym)
+ wpa_printf(MSG_INFO, "[%d]: %s", i, sym[i]);
+ else
+ wpa_printf(MSG_INFO, "[%d]: ?? [%p]", i, btrace[i]);
+ wpa_trace_bfd_addr(btrace[i]);
+ if (state == TRACE_RELEVANT && func &&
+ os_strcmp(func, "main") == 0)
+ state = TRACE_TAIL;
+ }
+ free(sym);
+ wpa_printf(MSG_INFO, "WPA_TRACE: %s - END", title);
+}
+
+
+void wpa_trace_show(const char *title)
+{
+ struct info {
+ WPA_TRACE_INFO
+ } info;
+ wpa_trace_record(&info);
+ wpa_trace_dump(title, &info);
+}
+
+
+void wpa_trace_add_ref_func(struct wpa_trace_ref *ref, const void *addr)
+{
+ if (addr == NULL)
+ return;
+ ref->addr = addr;
+ wpa_trace_record(ref);
+ dl_list_add(&active_references, &ref->list);
+}
+
+
+void wpa_trace_check_ref(const void *addr)
+{
+ struct wpa_trace_ref *ref;
+ dl_list_for_each(ref, &active_references, struct wpa_trace_ref, list) {
+ if (addr != ref->addr)
+ continue;
+ wpa_trace_show("Freeing referenced memory");
+ wpa_trace_dump("Reference registration", ref);
+ abort();
+ }
+}
+
+#endif /* WPA_TRACE */
projects / mech_eap.orig / blobdiff