diff options
Diffstat (limited to 'sysdeps')
| -rw-r--r-- | sysdeps/generic/backtracesymsfd.c | 61 | ||||
| -rw-r--r-- | sysdeps/generic/elf/backtracesyms.c | 8 | ||||
| -rw-r--r-- | sysdeps/generic/elf/backtracesymsfd.c | 109 | ||||
| -rw-r--r-- | sysdeps/generic/segfault.c | 165 | ||||
| -rw-r--r-- | sysdeps/generic/sigcontextinfo.h | 24 | ||||
| -rw-r--r-- | sysdeps/unix/sysv/linux/i386/sigcontextinfo.h | 23 |
6 files changed, 386 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) diff --git a/sysdeps/unix/sysv/linux/i386/sigcontextinfo.h b/sysdeps/unix/sysv/linux/i386/sigcontextinfo.h new file mode 100644 index 0000000000..b9913a4f4c --- /dev/null +++ b/sysdeps/unix/sysv/linux/i386/sigcontextinfo.h @@ -0,0 +1,23 @@ +/* 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. */ + +#define SIGCONTEXT struct sigcontext +#define GET_EIP(ctx) ((void *) ctx.eip) +#define GET_FRAME(ctx) ((void *) ctx.ebp) +#define GET_STACK(ctx) ((void *) ctx.esp_at_signal) |