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-rw-r--r--libubacktrace/backtracesyms.c105
1 files changed, 105 insertions, 0 deletions
diff --git a/libubacktrace/backtracesyms.c b/libubacktrace/backtracesyms.c
new file mode 100644
index 000000000..4486fee94
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+++ b/libubacktrace/backtracesyms.c
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+/* Return list with names for address in backtrace.
+ Copyright (C) 1998,1999,2000,2001,2003 Free Software Foundation, Inc.
+ This file is part of the GNU C Library.
+ Contributed by Ulrich Drepper <drepper@cygnus.com>, 1998.
+
+ The GNU C Library is free software; you can redistribute it and/or
+ modify it under the terms of the GNU Lesser General Public
+ License as published by the Free Software Foundation; either
+ version 2.1 of the License, or (at your option) any later version.
+
+ The GNU C Library is distributed in the hope that it will be useful,
+ but WITHOUT ANY WARRANTY; without even the implied warranty of
+ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ Lesser General Public License for more details.
+
+ You should have received a copy of the GNU Lesser General Public
+ License along with the GNU C Library; if not, write to the Free
+ Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
+ 02111-1307 USA.
+
+ Based on glibc/sysdeps/generic/elf/backtracesyms.c
+
+ Copyright (C) 2010 STMicroelectronics Ltd
+ Author(s): Carmelo Amoroso <carmelo.amoroso@st.com>
+ * Modified to work with uClibc
+ - updated headers inclusion
+ - updated formatting and style
+ - updated to use dladdr from libdl */
+
+#include <execinfo.h>
+#include <assert.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+
+#include <dlfcn.h>
+#include <link.h> /* required for __ELF_NATIVE_CLASS */
+
+#if __ELF_NATIVE_CLASS == 32
+# define WORD_WIDTH 8
+#else
+/* We assyme 64bits. */
+# define WORD_WIDTH 16
+#endif
+
+
+char ** backtrace_symbols (void *const *array, int size)
+{
+ Dl_info info[size];
+ int status[size];
+ int cnt;
+ size_t total = 0;
+ char **result;
+
+ /* Fill in the information we can get from `dladdr'. */
+ for (cnt = 0; cnt < size; ++cnt) {
+ status[cnt] = dladdr (array[cnt], &info[cnt]);
+ if (status[cnt] && info[cnt].dli_fname &&
+ info[cnt].dli_fname[0] != '\0')
+ /*
+ * We have some info, compute the length of the string which will be
+ * "<file-name>(<sym-name>) [+offset].
+ */
+ total += (strlen (info[cnt].dli_fname ?: "") +
+ (info[cnt].dli_sname ?
+ strlen (info[cnt].dli_sname) + 3 + WORD_WIDTH + 3 : 1)
+ + WORD_WIDTH + 5);
+ else
+ total += 5 + WORD_WIDTH;
+ }
+
+ /* Allocate memory for the result. */
+ result = (char **) malloc (size * sizeof (char *) + total);
+ if (result != NULL) {
+ char *last = (char *) (result + size);
+ for (cnt = 0; cnt < size; ++cnt) {
+ result[cnt] = last;
+
+ if (status[cnt] && info[cnt].dli_fname
+ && info[cnt].dli_fname[0] != '\0') {
+
+ char buf[20];
+
+ if (array[cnt] >= (void *) info[cnt].dli_saddr)
+ sprintf (buf, "+%#lx",
+ (unsigned long)(array[cnt] - info[cnt].dli_saddr));
+ else
+ sprintf (buf, "-%#lx",
+ (unsigned long)(info[cnt].dli_saddr - array[cnt]));
+
+ last += 1 + sprintf (last, "%s%s%s%s%s[%p]",
+ info[cnt].dli_fname ?: "",
+ info[cnt].dli_sname ? "(" : "",
+ info[cnt].dli_sname ?: "",
+ info[cnt].dli_sname ? buf : "",
+ info[cnt].dli_sname ? ") " : " ",
+ array[cnt]);
+ } else
+ last += 1 + sprintf (last, "[%p]", array[cnt]);
+ }
+ assert (last <= (char *) result + size * sizeof (char *) + total);
+ }
+
+ return result;
+}