2 * Copyright (c) 2008, 2009 Nicira Networks.
4 * Permission to use, copy, modify, and/or distribute this software for any
5 * purpose with or without fee is hereby granted, provided that the above
6 * copyright notice and this permission notice appear in all copies.
8 * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
9 * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
10 * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
11 * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
12 * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
13 * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
14 * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
18 #include "backtrace.h"
25 #define THIS_MODULE VLM_backtrace
28 static uintptr_t UNUSED
31 static const char file_name[] = "/proc/self/maps";
36 f = fopen(file_name, "r");
38 VLOG_WARN("opening %s failed: %s", file_name, strerror(errno));
42 for (line_number = 1; fgets(line, sizeof line, f); line_number++) {
43 if (strstr(line, "[stack]")) {
45 if (sscanf(line, "%*"SCNxPTR"-%"SCNxPTR, &end) != 1) {
46 VLOG_WARN("%s:%d: parse error", file_name, line_number);
55 VLOG_WARN("%s: no stack found", file_name);
62 static uintptr_t high;
64 high = get_max_stack();
74 asm("movl %%esp,%0" : "=g" (low));
77 /* This causes a warning in GCC that cannot be disabled, so use it only on
80 return (uintptr_t) &dummy;
87 uintptr_t address = (uintptr_t) p;
88 return address >= stack_low() && address < stack_high();
92 backtrace_capture(struct backtrace *backtrace)
98 for (frame = __builtin_frame_address(1);
99 frame != NULL && in_stack(frame) && frame[0] != NULL
100 && n < BACKTRACE_MAX_FRAMES;
103 backtrace->frames[n++] = (uintptr_t) frame[1];
105 backtrace->n_frames = n;