/*
- * Copyright (c) 2008, 2009, 2010 Nicira Networks.
+ * Copyright (c) 2008, 2009, 2010, 2011, 2013 Nicira, Inc.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
*/
#include <config.h>
-#include "backtrace.h"
-#include <errno.h>
-#include <inttypes.h>
-#include <stdbool.h>
-#include <stdio.h>
-#include "compiler.h"
-#define THIS_MODULE VLM_backtrace
-#include "vlog.h"
+#include "backtrace.h"
-static uintptr_t OVS_UNUSED
-get_max_stack(void)
+#ifdef HAVE_BACKTRACE
+#include <execinfo.h>
+void
+backtrace_capture(struct backtrace *b)
{
- static const char file_name[] = "/proc/self/maps";
- char line[1024];
- int line_number;
- FILE *f;
+ void *frames[BACKTRACE_MAX_FRAMES];
+ int i;
- f = fopen(file_name, "r");
- if (f == NULL) {
- VLOG_WARN("opening %s failed: %s", file_name, strerror(errno));
- return -1;
+ b->n_frames = backtrace(frames, BACKTRACE_MAX_FRAMES);
+ for (i = 0; i < b->n_frames; i++) {
+ b->frames[i] = (uintptr_t) frames[i];
}
-
- for (line_number = 1; fgets(line, sizeof line, f); line_number++) {
- if (strstr(line, "[stack]")) {
- uintptr_t end;
- if (sscanf(line, "%*x-%"SCNxPTR, &end) != 1) {
- VLOG_WARN("%s:%d: parse error", file_name, line_number);
- continue;
- }
- fclose(f);
- return end;
- }
- }
- fclose(f);
-
- VLOG_WARN("%s: no stack found", file_name);
- return -1;
}
-
-static uintptr_t
-stack_high(void)
-{
- static uintptr_t high;
- if (!high) {
- high = get_max_stack();
- }
- return high;
-}
-
-static uintptr_t
-stack_low(void)
-{
-#ifdef __i386__
- uintptr_t low;
- asm("movl %%esp,%0" : "=g" (low));
- return low;
-#elif __x86_64__
- uintptr_t low;
- asm("movq %%rsp,%0" : "=g" (low));
- return low;
#else
- /* This causes a warning in GCC that cannot be disabled, so use it only on
- * non-x86. */
- int dummy;
- return (uintptr_t) &dummy;
-#endif
-}
-
-static bool
-in_stack(void *p)
-{
- uintptr_t address = (uintptr_t) p;
- return address >= stack_low() && address < stack_high();
-}
-
void
backtrace_capture(struct backtrace *backtrace)
{
- void **frame;
- size_t n;
-
- n = 0;
- for (frame = __builtin_frame_address(1);
- frame != NULL && in_stack(frame) && frame[0] != NULL
- && n < BACKTRACE_MAX_FRAMES;
- frame = frame[0])
- {
- backtrace->frames[n++] = (uintptr_t) frame[1];
- }
- backtrace->n_frames = n;
+ backtrace->n_frames = 0;
}
+#endif