Mikio Hara
124 lines
3.5 KiB
C
124 lines
3.5 KiB
C
/* Copyright (c) 2008, 2009 The Board of Trustees of The Leland Stanford
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* Junior University
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*
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* We are making the OpenFlow specification and associated documentation
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* (Software) available for public use and benefit with the expectation
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* that others will use, modify and enhance the Software and contribute
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* those enhancements back to the community. However, since we would
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* like to make the Software available for broadest use, with as few
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* restrictions as possible permission is hereby granted, free of
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* charge, to any person obtaining a copy of this Software to deal in
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* the Software under the copyrights without restriction, including
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* without limitation the rights to use, copy, modify, merge, publish,
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* distribute, sublicense, and/or sell copies of the Software, and to
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* permit persons to whom the Software is furnished to do so, subject to
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* the following conditions:
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*
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* The above copyright notice and this permission notice shall be
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* included in all copies or substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
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* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
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* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
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* NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
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* BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
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* ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
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* CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
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* SOFTWARE.
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*
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* The name and trademarks of copyright holder(s) may NOT be used in
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* advertising or publicity pertaining to the Software or any
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* derivatives without specific, written prior permission.
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*/
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#include <config.h>
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#include "backtrace.h"
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#include <errno.h>
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#include <inttypes.h>
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#include <stdbool.h>
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#include <stdio.h>
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#include "compiler.h"
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#define THIS_MODULE VLM_backtrace
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#include "vlog.h"
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static uintptr_t UNUSED
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get_max_stack(void)
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{
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static const char file_name[] = "/proc/self/maps";
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char line[1024];
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int line_number;
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FILE *f;
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f = fopen(file_name, "r");
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if (f == NULL) {
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VLOG_WARN("opening %s failed: %s", file_name, strerror(errno));
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return -1;
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}
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for (line_number = 1; fgets(line, sizeof line, f); line_number++) {
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if (strstr(line, "[stack]")) {
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uintptr_t end;
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if (sscanf(line, "%*"SCNxPTR"-%"SCNxPTR, &end) != 1) {
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VLOG_WARN("%s:%d: parse error", file_name, line_number);
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continue;
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}
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fclose(f);
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return end;
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}
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}
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fclose(f);
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VLOG_WARN("%s: no stack found", file_name);
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return -1;
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}
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static uintptr_t
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stack_high(void)
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{
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static uintptr_t high;
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if (!high) {
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high = get_max_stack();
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}
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return high;
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}
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static uintptr_t
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stack_low(void)
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{
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#ifdef __i386__
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uintptr_t low;
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asm("movl %%esp,%0" : "=g" (low));
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return low;
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#else
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/* This causes a warning in GCC that cannot be disabled, so use it only on
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* non-x86. */
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int dummy;
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return (uintptr_t) &dummy;
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#endif
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}
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static bool
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in_stack(void *p)
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{
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uintptr_t address = (uintptr_t) p;
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return address >= stack_low() && address < stack_high();
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}
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void
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backtrace_capture(struct backtrace *backtrace)
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{
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void **frame;
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size_t n;
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n = 0;
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for (frame = __builtin_frame_address(1);
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frame != NULL && in_stack(frame) && frame[0] != NULL
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&& n < BACKTRACE_MAX_FRAMES;
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frame = frame[0])
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{
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backtrace->frames[n++] = (uintptr_t) frame[1];
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}
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backtrace->n_frames = n;
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}
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