X-Git-Url: http://git.onelab.eu/?a=blobdiff_plain;f=lib%2Fbacktrace.c;h=861a109d24c4f100082ed492f0c00d8c3a120f28;hb=015ac88281952a1b43ad46e9e6300db1c6e3647b;hp=07060390056aa8371e6bbedef3c0bbf8265b0978;hpb=064af42167bf4fc9aaea2702d80ce08074b889c0;p=sliver-openvswitch.git

diff --git a/lib/backtrace.c b/lib/backtrace.c
index 070603900..861a109d2 100644
--- a/lib/backtrace.c
+++ b/lib/backtrace.c
@@ -1,106 +1,40 @@
 /*
- * Copyright (c) 2008, 2009 Nicira Networks.
+ * Copyright (c) 2008, 2009, 2010, 2011, 2013 Nicira, Inc.
  *
- * Permission to use, copy, modify, and/or distribute this software for any
- * purpose with or without fee is hereby granted, provided that the above
- * copyright notice and this permission notice appear in all copies.
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at:
  *
- * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
- * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
- * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
- * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
- * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
- * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
- * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under 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 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;
-
-    f = fopen(file_name, "r");
-    if (f == NULL) {
-        VLOG_WARN("opening %s failed: %s", file_name, strerror(errno));
-        return -1;
-    }
+    void *frames[BACKTRACE_MAX_FRAMES];
+    int i;
 
-    for (line_number = 1; fgets(line, sizeof line, f); line_number++) {
-        if (strstr(line, "[stack]")) {
-            uintptr_t end;
-            if (sscanf(line, "%*"SCNxPTR"-%"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();
+    b->n_frames = backtrace(frames, BACKTRACE_MAX_FRAMES);
+    for (i = 0; i < b->n_frames; i++) {
+        b->frames[i] = (uintptr_t) frames[i];
     }
-    return high;
 }
-
-static uintptr_t
-stack_low(void)
-{
-#ifdef __i386__
-    uintptr_t low;
-    asm("movl %%esp,%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