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Hi this patch makes the s390* version of backtrace use the _Unwind_Backtrace and _Unwind_GetIP functions from the libgcc to do the job. They work even with -fomit-frame-pointer (thanks Jakub for the blueprint :-). blue skies, Martin. 2003-12-05 Martin Schwidefsky <schwidefsky@de.ibm.com> * sysdeps/s390/s390-32/backtrace.c (trace_arg): New structure. (unwind_backtrace, unwind_getip): New variables. (init, __backchain_backtrace, backtrace_helper): New functions. (__backtrace): Use unwind info for backtrace instead of backchain walking if the unwind functions can be found. * sysdeps/s390/s390-64/backtrace.c: Likewise. diff -urN libc/sysdeps/s390/s390-32/backtrace.c libc-s390/sysdeps/s390/s390-32/backtrace.c --- libc/sysdeps/s390/s390-32/backtrace.c 2003-03-28 14:25:36.000000000 +0100 +++ libc-s390/sysdeps/s390/s390-32/backtrace.c 2003-11-13 15:33:24.000000000 +0100 @@ -1,5 +1,5 @@ /* Return backtrace of current program state. - Copyright (C) 2000, 2001 Free Software Foundation, Inc. + Copyright (C) 2000, 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 highest used stack address. */ @@ -51,10 +55,31 @@ int empty[2]; }; -int -__backtrace (array, size) - void **array; - int size; +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; +} + +static int +__backchain_backtrace (void **array, int size) { /* We assume that all the code is generated with frame pointers set. */ struct layout *stack; @@ -71,11 +96,42 @@ out of range. */ break; - array[cnt++] = stack->save_grps[8] & 0x7fffffff; + array[cnt++] = (void *) (stack->save_grps[8] & 0x7fffffff); stack = (struct layout *) stack->back_chain; } 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) diff -urN libc/sysdeps/s390/s390-64/backtrace.c libc-s390/sysdeps/s390/s390-64/backtrace.c --- libc/sysdeps/s390/s390-64/backtrace.c 2003-05-06 10:05:46.000000000 +0200 +++ libc-s390/sysdeps/s390/s390-64/backtrace.c 2003-11-13 15:33:24.000000000 +0100 @@ -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 @@ 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 @@ 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)
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