From b6dec1881f8d1dba619f6c08fdf50cb70dc1eff4 Mon Sep 17 00:00:00 2001 From: Maxim Kuvyrkov Date: Wed, 24 Jun 2009 15:55:04 +0000 Subject: [PATCH] ARM EABI backtrace using unwind information. 2009-06-24 Maxim Kuvyrkov Mark Mitchell Joseph Myers Kazu Hirata * sysdeps/arm/eabi/backtrace.c: New. * sysdeps/arm/eabi/Makefile (CFLAGS-backtrace.c): Add -funwind-tables. * sysdeps/arm/preconfigure: Add -fno-unwind-tables to CFLAGS. * sysdeps/unix/sysv/linux/arm/eabi/configure.in: Remove -fno-unwind-tables from CFLAGS. * sysdeps/unix/sysv/linux/arm/eabi/configure: Regenerate. * sysdeps/unix/sysv/linux/arm/eabi/nptl/unwind.h (_Unwind_Trace_Fn): Define. (_Unwind_Backtrace): Declare. --- ChangeLog.arm | 16 ++++ sysdeps/arm/eabi/Makefile | 4 + sysdeps/arm/eabi/backtrace.c | 126 +++++++++++++++++++++++++ sysdeps/arm/preconfigure | 4 + sysdeps/unix/sysv/linux/arm/eabi/configure | 1 + sysdeps/unix/sysv/linux/arm/eabi/configure.in | 1 + sysdeps/unix/sysv/linux/arm/eabi/nptl/unwind.h | 7 +- 7 files changed, 158 insertions(+), 1 deletion(-) create mode 100644 sysdeps/arm/eabi/backtrace.c diff --git a/ChangeLog.arm b/ChangeLog.arm index 6750958..dbc00f6 100644 --- a/ChangeLog.arm +++ b/ChangeLog.arm @@ -1,3 +1,19 @@ +2009-06-24 Maxim Kuvyrkov + Mark Mitchell + Joseph Myers + Kazu Hirata + + * sysdeps/arm/eabi/backtrace.c: New. + * sysdeps/arm/eabi/Makefile (CFLAGS-backtrace.c): Add + -funwind-tables. + * sysdeps/arm/preconfigure: Add -fno-unwind-tables to CFLAGS. + * sysdeps/unix/sysv/linux/arm/eabi/configure.in: Remove + -fno-unwind-tables from CFLAGS. + * sysdeps/unix/sysv/linux/arm/eabi/configure: Regenerate. + * sysdeps/unix/sysv/linux/arm/eabi/nptl/unwind.h (_Unwind_Trace_Fn): + Define. + (_Unwind_Backtrace): Declare. + 2009-05-18 Joseph Myers * sysdeps/arm/____longjmp_chk.S (CHECK_SP): Use unsigned diff --git a/sysdeps/arm/eabi/Makefile b/sysdeps/arm/eabi/Makefile index 0f92d7a..890d1d9 100644 --- a/sysdeps/arm/eabi/Makefile +++ b/sysdeps/arm/eabi/Makefile @@ -11,6 +11,10 @@ static-only-routines += $(aeabi_constants) gen-as-const-headers += rtld-global-offsets.sym endif +ifeq ($(subdir),debug) +CFLAGS-backtrace.c += -funwind-tables +endif + ifeq ($(subdir),elf) sysdep_routines += aeabi_unwind_cpp_pr1 find_exidx shared-only-routines += aeabi_unwind_cpp_pr1 diff --git a/sysdeps/arm/eabi/backtrace.c b/sysdeps/arm/eabi/backtrace.c new file mode 100644 index 0000000..752a435 --- /dev/null +++ b/sysdeps/arm/eabi/backtrace.c @@ -0,0 +1,126 @@ +/* Return backtrace of current program state. + Copyright (C) 2008, 2009 Free Software Foundation, Inc. + This file is part of the GNU C Library. + Contributed by Kazu Hirata , 2008. + + 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 +#include +#include +#include +#include + +struct trace_arg +{ + void **array; + int cnt, size; +}; + +#ifdef SHARED +static _Unwind_Reason_Code (*unwind_backtrace) (_Unwind_Trace_Fn, void *); +static _Unwind_VRS_Result (*unwind_vrs_get) (_Unwind_Context *, + _Unwind_VRS_RegClass, + _uw, + _Unwind_VRS_DataRepresentation, + void *); + +static void *libgcc_handle; + +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_vrs_get = __libc_dlsym (libgcc_handle, "_Unwind_VRS_Get"); + if (unwind_vrs_get == NULL) + unwind_backtrace = NULL; +} + +/* This function is identical to "_Unwind_GetGR", except that it uses + "unwind_vrs_get" instead of "_Unwind_VRS_Get". */ +static inline _Unwind_Word +unwind_getgr (_Unwind_Context *context, int regno) +{ + _uw val; + unwind_vrs_get (context, _UVRSC_CORE, regno, _UVRSD_UINT32, &val); + return val; +} + +/* This macro is identical to the _Unwind_GetIP macro, except that it + uses "unwind_getgr" instead of "_Unwind_GetGR". */ +# define unwind_getip(context) \ + (unwind_getgr (context, 15) & ~(_Unwind_Word)1) +#else +# define unwind_backtrace _Unwind_Backtrace +# define unwind_getip _Unwind_GetIP +#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; + return _URC_NO_REASON; +} + +int +__backtrace (array, size) + void **array; + int size; +{ + struct trace_arg arg = { .array = array, .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); + + 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 diff --git a/sysdeps/arm/preconfigure b/sysdeps/arm/preconfigure index 337e84f..313da79 100644 --- a/sysdeps/arm/preconfigure +++ b/sysdeps/arm/preconfigure @@ -11,3 +11,7 @@ arm*) esac ;; esac +if [ "${CFLAGS+set}" != "set" ]; then + CFLAGS="-g -O2" +fi +CFLAGS="$CFLAGS -fno-unwind-tables" diff --git a/sysdeps/unix/sysv/linux/arm/eabi/configure b/sysdeps/unix/sysv/linux/arm/eabi/configure index 28fb9ef..c7e20cf 100644 --- a/sysdeps/unix/sysv/linux/arm/eabi/configure +++ b/sysdeps/unix/sysv/linux/arm/eabi/configure @@ -3,3 +3,4 @@ arch_minimum_kernel=2.6.16 libc_cv_gcc_unwind_find_fde=no +CFLAGS=${CFLAGS% -fno-unwind-tables} diff --git a/sysdeps/unix/sysv/linux/arm/eabi/configure.in b/sysdeps/unix/sysv/linux/arm/eabi/configure.in index d1fb7f4..cc0e9b5 100644 --- a/sysdeps/unix/sysv/linux/arm/eabi/configure.in +++ b/sysdeps/unix/sysv/linux/arm/eabi/configure.in @@ -3,3 +3,4 @@ GLIBC_PROVIDES dnl See aclocal.m4 in the top level source directory. arch_minimum_kernel=2.6.16 libc_cv_gcc_unwind_find_fde=no +CFLAGS=${CFLAGS% -fno-unwind-tables} diff --git a/sysdeps/unix/sysv/linux/arm/eabi/nptl/unwind.h b/sysdeps/unix/sysv/linux/arm/eabi/nptl/unwind.h index d625fb2..eeb9cf8 100644 --- a/sysdeps/unix/sysv/linux/arm/eabi/nptl/unwind.h +++ b/sysdeps/unix/sysv/linux/arm/eabi/nptl/unwind.h @@ -1,5 +1,5 @@ /* Header file for the ARM EABI unwinder - Copyright (C) 2003, 2004, 2005 Free Software Foundation, Inc. + Copyright (C) 2003, 2004, 2005, 2009 Free Software Foundation, Inc. Contributed by Paul Brook This file is free software; you can redistribute it and/or modify it @@ -267,6 +267,11 @@ extern "C" { #define _Unwind_SetIP(context, val) \ _Unwind_SetGR (context, 15, val | (_Unwind_GetGR (context, 15) & 1)) +typedef _Unwind_Reason_Code (*_Unwind_Trace_Fn) + (struct _Unwind_Context *, void *); + +extern _Unwind_Reason_Code _Unwind_Backtrace (_Unwind_Trace_Fn, void *); + #ifdef __cplusplus } /* extern "C" */ #endif -- 2.7.4