diff options
Diffstat (limited to 'sysdeps/s390/s390-64/backtrace.c')
-rw-r--r-- | sysdeps/s390/s390-64/backtrace.c | 64 |
1 files changed, 60 insertions, 4 deletions
diff --git a/sysdeps/s390/s390-64/backtrace.c b/sysdeps/s390/s390-64/backtrace.c index 1eed72adab..8efdc6c0ac 100644 --- a/sysdeps/s390/s390-64/backtrace.c +++ b/sysdeps/s390/s390-64/backtrace.c @@ -1,5 +1,5 @@ /* Return backtrace of current program state. 64 bit S/390 version. - Copyright (C) 2001 Free Software Foundation, Inc. + Copyright (C) 2001, 2003 Free Software Foundation, Inc. Contributed by Martin Schwidefsky (schwidefsky@de.ibm.com). This file is part of the GNU C Library. @@ -18,8 +18,12 @@ 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 <stddef.h> +#include <stdlib.h> +#include <unwind.h> /* This is a global variable set at program start time. It marks the @@ -50,10 +54,31 @@ struct layout long empty[2]; }; +struct trace_arg +{ + void **array; + int cnt, size; +}; + +static _Unwind_Reason_Code (*unwind_backtrace) (_Unwind_Trace_Fn, void *); +static _Unwind_Ptr (*unwind_getip) (struct _Unwind_Context *); + +static void +init (void) +{ + void *handle = __libc_dlopen ("libgcc_s.so.1"); + + if (handle == NULL) + return; + + unwind_backtrace = __libc_dlsym (handle, "_Unwind_Backtrace"); + unwind_getip = __libc_dlsym (handle, "_Unwind_GetIP"); + if (unwind_getip == NULL) + unwind_backtrace = NULL; +} + int -__backtrace (array, size) - void **array; - int size; +__backchain_backtrace (void **array, int size) { /* We assume that all the code is generated with frame pointers set. */ struct layout *stack; @@ -77,4 +102,35 @@ __backtrace (array, size) return cnt; } + +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; + return _URC_NO_REASON; +} + +int +__backtrace (void **array, int size) +{ + struct trace_arg arg = { .array = array, .size = size, .cnt = -1 }; + __libc_once_define (static, once); + + __libc_once (once, init); + if (unwind_backtrace == NULL) + return __backchain_backtrace (array, size); + + if (size >= 1) + unwind_backtrace (backtrace_helper, &arg); + + return arg.cnt != -1 ? arg.cnt : 0; +} + weak_alias (__backtrace, backtrace) |