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-rw-r--r--sysdeps/generic/backtracesymsfd.c61
-rw-r--r--sysdeps/generic/elf/backtracesyms.c8
-rw-r--r--sysdeps/generic/elf/backtracesymsfd.c109
-rw-r--r--sysdeps/generic/segfault.c165
-rw-r--r--sysdeps/generic/sigcontextinfo.h24
5 files changed, 363 insertions, 4 deletions
diff --git a/sysdeps/generic/backtracesymsfd.c b/sysdeps/generic/backtracesymsfd.c
new file mode 100644
index 0000000000..dc4f083ff4
--- /dev/null
+++ b/sysdeps/generic/backtracesymsfd.c
@@ -0,0 +1,61 @@
+/* Write formatted list with names for addresses in backtrace to a file.
+ Copyright (C) 1998 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 Library General Public License as
+ published by the Free Software Foundation; either version 2 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
+ Library General Public License for more details.
+
+ You should have received a copy of the GNU Library General Public
+ License along with the GNU C Library; see the file COPYING.LIB. If not,
+ write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
+ Boston, MA 02111-1307, USA. */
+
+#include <execinfo.h>
+#include <string.h>
+#include <sys/uio.h>
+
+#include <stdio-common/_itoa.h>
+
+#if __ELF_NATIVE_CLASS == 32
+# define WORD_WIDTH 8
+#else
+/* We assyme 64bits. */
+# define WORD_WIDTH 16
+#endif
+
+
+void
+__backtrace_symbols_fd (array, size, fd)
+ void *const *array;
+ int size;
+ int fd;
+{
+ struct iovec iov[3];
+ int cnt;
+
+ for (cnt = 0; cnt < size; ++cnt)
+ {
+ char buf[WORD_WIDTH];
+
+ iov[0].iov_base = (void *) "[0x";
+ iov[0].iov_len = 3;
+
+ iov[1].iov_base = _itoa_word ((unsigned long int) array[cnt],
+ &buf[WORD_WIDTH], 16, 0);
+ iov[1].iov_len = &buf[WORD_WIDTH] - (char *) iov[1].iov_base;
+
+ iov[2].iov_base = (void *) "]\n";
+ iov[2].iov_len = 2;
+
+ __writev (fd, iov, 3);
+ }
+}
+weak_alias (__backtrace_symbols_fd, backtrace_symbols_fd)
diff --git a/sysdeps/generic/elf/backtracesyms.c b/sysdeps/generic/elf/backtracesyms.c
index 7de0bfc9ee..a14ac596b4 100644
--- a/sysdeps/generic/elf/backtracesyms.c
+++ b/sysdeps/generic/elf/backtracesyms.c
@@ -55,9 +55,9 @@ __backtrace_symbols (array, size)
+ (info[cnt].dli_sname
? strlen (info[cnt].dli_sname) + 3 + WORD_WIDTH + 3
: 1)
- + WORD_WIDTH + 6);
+ + WORD_WIDTH + 5);
else
- total += 6 + WORD_WIDTH;
+ total += 5 + WORD_WIDTH;
}
/* Allocate memory for the result. */
@@ -80,7 +80,7 @@ __backtrace_symbols (array, size)
else
sprintf (buf, "-0x%x", info[cnt].dli_saddr - array[cnt]);
- last += 1 + sprintf (last, "%s%s%s%s%s[+%p]",
+ last += 1 + sprintf (last, "%s%s%s%s%s[%p]",
info[cnt].dli_fname ?: "",
info[cnt].dli_sname ? "(" : "",
info[cnt].dli_sname ?: "",
@@ -89,7 +89,7 @@ __backtrace_symbols (array, size)
array[cnt]);
}
else
- last += 1 + sprintf (last, "[+%p]", array[cnt]);
+ last += 1 + sprintf (last, "[%p]", array[cnt]);
}
}
diff --git a/sysdeps/generic/elf/backtracesymsfd.c b/sysdeps/generic/elf/backtracesymsfd.c
new file mode 100644
index 0000000000..b67b64529e
--- /dev/null
+++ b/sysdeps/generic/elf/backtracesymsfd.c
@@ -0,0 +1,109 @@
+/* Write formatted list with names for addresses in backtrace to a file.
+ Copyright (C) 1998 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 Library General Public License as
+ published by the Free Software Foundation; either version 2 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
+ Library General Public License for more details.
+
+ You should have received a copy of the GNU Library General Public
+ License along with the GNU C Library; see the file COPYING.LIB. If not,
+ write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
+ Boston, MA 02111-1307, USA. */
+
+#include <execinfo.h>
+#include <string.h>
+#include <sys/uio.h>
+
+#include <stdio-common/_itoa.h>
+#include <elf/ldsodefs.h>
+
+#if __ELF_NATIVE_CLASS == 32
+# define WORD_WIDTH 8
+#else
+/* We assyme 64bits. */
+# define WORD_WIDTH 16
+#endif
+
+
+void
+__backtrace_symbols_fd (array, size, fd)
+ void *const *array;
+ int size;
+ int fd;
+{
+ struct iovec iov[9];
+ int cnt;
+
+ for (cnt = 0; cnt < size; ++cnt)
+ {
+ char buf[WORD_WIDTH];
+ Dl_info info;
+ size_t last = 0;
+
+ if (_dl_addr (array[cnt], &info)
+ && info.dli_fname && info.dli_fname[0] != '\0')
+ {
+ /* Name of the file. */
+ iov[0].iov_base = (void *) info.dli_fname;
+ iov[0].iov_len = strlen (info.dli_fname);
+ last = 1;
+
+ /* Symbol name. */
+ if (info.dli_sname != NULL)
+ {
+ char buf2[WORD_WIDTH];
+ size_t diff;
+
+ iov[1].iov_base = (void *) "(";
+ iov[1].iov_len = 1;
+ iov[2].iov_base = (void *) info.dli_sname;
+ iov[2].iov_len = strlen (info.dli_sname);
+
+ if (array[cnt] >= (void *) info.dli_saddr)
+ {
+ iov[3].iov_base = (void *) "+0x";
+ diff = array[cnt] - info.dli_saddr;
+ }
+ else
+ {
+ iov[3].iov_base = (void *) "-0x";
+ diff = info.dli_saddr - array[cnt];
+ }
+ iov[3].iov_len = 3;
+
+ iov[4].iov_base = _itoa_word ((unsigned long int) diff,
+ &buf2[WORD_WIDTH], 16, 0);
+ iov[4].iov_len = &buf2[WORD_WIDTH] - (char *) iov[4].iov_base;
+
+ iov[5].iov_base = (void *) ")";
+ iov[5].iov_len = 1;
+
+ last = 6;
+ }
+ }
+
+ iov[last].iov_base = (void *) "[0x";
+ iov[last].iov_len = 3;
+ ++last;
+
+ iov[last].iov_base = _itoa_word ((unsigned long int) array[cnt],
+ &buf[WORD_WIDTH], 16, 0);
+ iov[last].iov_len = &buf[WORD_WIDTH] - (char *) iov[last].iov_base;
+ ++last;
+
+ iov[last].iov_base = (void *) "]\n";
+ iov[last].iov_len = 2;
+ ++last;
+
+ __writev (fd, iov, last);
+ }
+}
+weak_alias (__backtrace_symbols_fd, backtrace_symbols_fd)
diff --git a/sysdeps/generic/segfault.c b/sysdeps/generic/segfault.c
new file mode 100644
index 0000000000..868ff1dfd7
--- /dev/null
+++ b/sysdeps/generic/segfault.c
@@ -0,0 +1,165 @@
+/* Catch segmentation faults and print backtrace.
+ Copyright (C) 1998 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 Library General Public License as
+ published by the Free Software Foundation; either version 2 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
+ Library General Public License for more details.
+
+ You should have received a copy of the GNU Library General Public
+ License along with the GNU C Library; see the file COPYING.LIB. If not,
+ write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
+ Boston, MA 02111-1307, USA. */
+
+#include <execinfo.h>
+#include <fcntl.h>
+#include <signal.h>
+#include <stdlib.h>
+#include <unistd.h>
+
+/* This file defines macros to access the content of the sigcontext element
+ passed up by the signal handler. */
+#include <sigcontextinfo.h>
+
+/* This is a global variable set at program start time. It marks the
+ highest used stack address. */
+extern void *__libc_stack_end;
+
+
+/* This implementation assumes a stack layout that matches the defaults
+ used by gcc's `__builtin_frame_address' and `__builtin_return_address'
+ (FP is the frame pointer register):
+
+ +-----------------+ +-----------------+
+ FP -> | previous FP --------> | previous FP ------>...
+ | | | |
+ | return address | | return address |
+ +-----------------+ +-----------------+
+
+ */
+
+/* Get some notion of the current stack. Need not be exactly the top
+ of the stack, just something somewhere in the current frame. */
+#ifndef CURRENT_STACK_FRAME
+# define CURRENT_STACK_FRAME ({ char __csf; &__csf; })
+#endif
+
+/* By default we assume that the stack grows downward. */
+#ifndef INNER_THAN
+# define INNER_THAN <
+#endif
+
+struct layout
+{
+ struct layout *next;
+ void *return_address;
+};
+
+
+static void
+handle (int fd, void *addr)
+{
+}
+
+
+/* This function is called when a segmentation fault is caught. The system
+ is in an instable state now. This means especially that malloc() might
+ not work anymore. */
+static void
+catch_segfault (int signal, SIGCONTEXT ctx)
+{
+ struct layout *current;
+ void *top_frame;
+ void *top_stack;
+ const char *fname;
+ int fd;
+ void **arr;
+ size_t cnt;
+
+ /* This is the name of the file we are writing to. If none is given
+ or we cannot write to this file write to stderr. */
+ fd = 2;
+ fname = getenv ("SEGFAULT_OUTPUT_NAME");
+ if (fname != NULL && fname[0] != '\0')
+ {
+ fd = open (fname, O_TRUNC | O_WRONLY | O_CREAT);
+ if (fd == -1)
+ fd = 2;
+ }
+
+#define WRITE_STRING(s) write (fd, s, sizeof (s) - 1)
+ WRITE_STRING ("*** Segmentation Fault\n");
+ WRITE_STRING ("Backtrace:\n");
+
+ top_frame = GET_FRAME (ctx);
+ top_stack = GET_STACK (ctx);
+
+ /* First count how many entries we'll have. */
+ cnt = 1;
+ current = (struct layout *) top_frame;
+ while (!((void *) current INNER_THAN top_stack
+ || !((void *) current INNER_THAN __libc_stack_end)))
+ {
+ ++cnt;
+
+ current = current->next;
+ }
+
+ arr = alloca (cnt * sizeof (void *));
+
+ /* First handle the program counter from the structure. */
+ arr[0] = GET_EIP (ctx);
+
+ current = (struct layout *) top_frame;
+ cnt = 1;
+ while (!((void *) current INNER_THAN top_stack
+ || !((void *) current INNER_THAN __libc_stack_end)))
+ {
+ arr[cnt++] = current->return_address;
+
+ current = current->next;
+ }
+
+ /* Now generate nicely formatted output. */
+ __backtrace_symbols_fd (arr, cnt, fd);
+
+ /* Nothing else to do. */
+ _exit (128 + SIGSEGV);
+}
+
+
+static void
+__attribute__ ((constructor))
+install_handler (void)
+{
+ struct sigaction sa;
+
+ sa.sa_handler = (void *) catch_segfault;
+ sigemptyset (&sa.sa_mask);
+ sa.sa_flags = SA_RESTART;
+
+ sigaction (SIGSEGV, &sa, NULL);
+
+ /* Maybe we are expected to use an alternative stack. */
+ if (getenv ("SEGFAULT_USE_ALTSTACK") != 0)
+ {
+ void *stack_mem = malloc (2 * SIGSTKSZ);
+ struct sigaltstack ss;
+
+ if (stack_mem != NULL)
+ {
+ ss.ss_sp = stack_mem;
+ ss.ss_flags = SS_ONSTACK;
+ ss.ss_size = 2 * SIGSTKSZ;
+
+ sigaltstack (&ss, NULL);
+ }
+ }
+}
diff --git a/sysdeps/generic/sigcontextinfo.h b/sysdeps/generic/sigcontextinfo.h
new file mode 100644
index 0000000000..014db6624c
--- /dev/null
+++ b/sysdeps/generic/sigcontextinfo.h
@@ -0,0 +1,24 @@
+/* Copyright (C) 1998 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 Library General Public License as
+ published by the Free Software Foundation; either version 2 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
+ Library General Public License for more details.
+
+ You should have received a copy of the GNU Library General Public
+ License along with the GNU C Library; see the file COPYING.LIB. If not,
+ write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
+ Boston, MA 02111-1307, USA. */
+
+/* In general we cannot provide any information. */
+#define SIGCONTEXT struct sigcontext *
+#define GET_EIP(ctx) ((void *) 0)
+#define GET_FRAME(ctx) ((void *) 0)
+#define GET_STACK(ctx) ((void *) 0)
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