diff options
Diffstat (limited to 'sysdeps/m68k/backtrace.c')
| -rw-r--r-- | sysdeps/m68k/backtrace.c | 162 |
1 files changed, 0 insertions, 162 deletions
diff --git a/sysdeps/m68k/backtrace.c b/sysdeps/m68k/backtrace.c deleted file mode 100644 index 13ed3d86af..0000000000 --- a/sysdeps/m68k/backtrace.c +++ /dev/null @@ -1,162 +0,0 @@ -/* Return backtrace of current program state. - Copyright (C) 2013-2017 Free Software Foundation, Inc. - This file is part of the GNU C Library. - - 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, see - <http://www.gnu.org/licenses/>. */ - -#include <libc-lock.h> -#include <dlfcn.h> -#include <execinfo.h> -#include <stdlib.h> -#include <unwind.h> - -struct trace_arg -{ - void **array; - int cnt, size; - void *lastfp, *lastsp; -}; - -#ifdef SHARED -static _Unwind_Reason_Code (*unwind_backtrace) (_Unwind_Trace_Fn, void *); -static _Unwind_Ptr (*unwind_getip) (struct _Unwind_Context *); -static _Unwind_Ptr (*unwind_getcfa) (struct _Unwind_Context *); -static _Unwind_Ptr (*unwind_getgr) (struct _Unwind_Context *, int); -static void *libgcc_handle; - -static void -init (void) -{ - libgcc_handle = __libc_dlopen ("libgcc_s.so.2"); - - if (libgcc_handle == NULL) - return; - - unwind_backtrace = __libc_dlsym (libgcc_handle, "_Unwind_Backtrace"); - unwind_getip = __libc_dlsym (libgcc_handle, "_Unwind_GetIP"); - unwind_getcfa = __libc_dlsym (libgcc_handle, "_Unwind_GetCFA"); - unwind_getgr = __libc_dlsym (libgcc_handle, "_Unwind_GetGR"); - if (unwind_getip == NULL || unwind_getgr == NULL || unwind_getcfa == NULL) - { - unwind_backtrace = NULL; - __libc_dlclose (libgcc_handle); - libgcc_handle = NULL; - } -} -#else -# define unwind_backtrace _Unwind_Backtrace -# define unwind_getip _Unwind_GetIP -# define unwind_getcfa _Unwind_GetCFA -# define unwind_getgr _Unwind_GetGR -#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); - if (++arg->cnt == arg->size) - return _URC_END_OF_STACK; - - /* %fp is DWARF2 register 14 on M68K. */ - arg->lastfp = (void *) unwind_getgr (ctx, 14); - arg->lastsp = (void *) unwind_getcfa (ctx); - return _URC_NO_REASON; -} - - -/* This is a global variable set at program start time. It marks the - highest used stack address. */ -extern void *__libc_stack_end; - - -/* This is the stack layout we see with every stack frame - if not compiled without frame pointer. - - +-----------------+ +-----------------+ - %fp -> | %fp last frame--------> | %fp last frame--->... - | | | | - | return address | | return address | - +-----------------+ +-----------------+ - - First try as far to get as far as possible using - _Unwind_Backtrace which handles -fomit-frame-pointer - as well, but requires .eh_frame info. Then fall back to - walking the stack manually. */ - -struct layout -{ - struct layout *fp; - void *ret; -}; - - -int -__backtrace (void **array, int size) -{ - struct trace_arg arg = { .array = array, .size = size, .cnt = -1 }; - - if (size <= 0) - return 0; - -#ifdef SHARED - __libc_once_define (static, once); - - __libc_once (once, init); - if (unwind_backtrace == NULL) - return 0; -#endif - - unwind_backtrace (backtrace_helper, &arg); - - if (arg.cnt > 1 && arg.array[arg.cnt - 1] == NULL) - --arg.cnt; - else if (arg.cnt < size) - { - struct layout *fp = (struct layout *) arg.lastfp; - - while (arg.cnt < size) - { - /* Check for out of range. */ - if ((void *) fp < arg.lastsp || (void *) fp > __libc_stack_end - || ((long) fp & 1)) - break; - - array[arg.cnt++] = fp->ret; - fp = fp->fp; - } - } - 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 |