diff options
Diffstat (limited to 'sysdeps')
| -rw-r--r-- | sysdeps/sh/backtrace.c | 2 | ||||
| -rw-r--r-- | sysdeps/x86_64/backtrace.c | 134 |
2 files changed, 134 insertions, 2 deletions
diff --git a/sysdeps/sh/backtrace.c b/sysdeps/sh/backtrace.c index ee7bf615d6..4f3eafb09c 100644 --- a/sysdeps/sh/backtrace.c +++ b/sysdeps/sh/backtrace.c @@ -1 +1 @@ -#include "../ia64/backtrace.c" +#include "../x86_64/backtrace.c" diff --git a/sysdeps/x86_64/backtrace.c b/sysdeps/x86_64/backtrace.c index ee7bf615d6..af65179203 100644 --- a/sysdeps/x86_64/backtrace.c +++ b/sysdeps/x86_64/backtrace.c @@ -1 +1,133 @@ -#include "../ia64/backtrace.c" +/* Return backtrace of current program state. + Copyright (C) 2003-2005,2007,2009,2011,2012 Free Software Foundation, Inc. + This file is part of the GNU C Library. + Contributed by Jakub Jelinek <jakub@redhat.com>, 2003. + + 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. */ + +#include <bits/libc-lock.h> +#include <dlfcn.h> +#include <execinfo.h> +#include <stdlib.h> +#include <unwind.h> + +struct trace_arg +{ + void **array; + _Unwind_Word cfa; + int cnt; + int size; +}; + +#ifdef SHARED +static _Unwind_Reason_Code (*unwind_backtrace) (_Unwind_Trace_Fn, void *); +static _Unwind_Ptr (*unwind_getip) (struct _Unwind_Context *); +static _Unwind_Word (*unwind_getcfa) (struct _Unwind_Context *); +static void *libgcc_handle; + + +/* Dummy version in case libgcc_s does not contain the real code. */ +static _Unwind_Word +dummy_getcfa (struct _Unwind_Context *ctx __attribute__ ((unused))) +{ + return 0; +} + + +static void +init (void) +{ + libgcc_handle = __libc_dlopen ("libgcc_s.so.1"); + + if (libgcc_handle == NULL) + return; + + unwind_backtrace = __libc_dlsym (libgcc_handle, "_Unwind_Backtrace"); + unwind_getip = __libc_dlsym (libgcc_handle, "_Unwind_GetIP"); + if (unwind_getip == NULL) + unwind_backtrace = NULL; + unwind_getcfa = (__libc_dlsym (libgcc_handle, "_Unwind_GetCFA") + ?: dummy_getcfa); +} +#else +# define unwind_backtrace _Unwind_Backtrace +# define unwind_getip _Unwind_GetIP +# define unwind_getcfa _Unwind_GetCFA +#endif + +static _Unwind_Reason_Code +backtrace_helper (struct _Unwind_Context *ctx, void *a) +{ + struct trace_arg *arg = a; + + /* We are first called with address in the __backtrace function. + Skip it. */ + if (arg->cnt != -1) + { + arg->array[arg->cnt] = (void *) unwind_getip (ctx); + + /* Check whether we make any progress. */ + _Unwind_Word cfa = unwind_getcfa (ctx); + + if (arg->cnt > 0 && arg->array[arg->cnt - 1] == arg->array[arg->cnt] + && cfa == arg->cfa) + return _URC_END_OF_STACK; + arg->cfa = cfa; + } + if (++arg->cnt == arg->size) + return _URC_END_OF_STACK; + return _URC_NO_REASON; +} + +int +__backtrace (array, size) + void **array; + int size; +{ + struct trace_arg arg = { .array = array, .cfa = 0, .size = size, .cnt = -1 }; +#ifdef SHARED + __libc_once_define (static, once); + + __libc_once (once, init); + if (unwind_backtrace == NULL) + return 0; +#endif + + if (size >= 1) + unwind_backtrace (backtrace_helper, &arg); + + /* _Unwind_Backtrace on IA-64 seems to put NULL address above + _start. Fix it up here. */ + if (arg.cnt > 1 && arg.array[arg.cnt - 1] == NULL) + --arg.cnt; + return arg.cnt != -1 ? arg.cnt : 0; +} +weak_alias (__backtrace, backtrace) +libc_hidden_def (__backtrace) + + +#ifdef SHARED +/* Free all resources if necessary. */ +libc_freeres_fn (free_mem) +{ + unwind_backtrace = NULL; + if (libgcc_handle != NULL) + { + __libc_dlclose (libgcc_handle); + libgcc_handle = NULL; + } +} +#endif |