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Implement _Unwind_GetIPInfo() as required by the C++ ABI

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Provide a special implementation for ia64, because the unwind
information is such that an IP adjustment is not necessary before
looking up unwind info.

Bad things happen if libunwind only provides parts of the ABI and
the rest come from libgcc.

Signed-off-by: Jan Kratochvil <jan.kratochvil@redhat.com>
This commit is contained in:
Arun Sharma 2009-04-02 15:49:37 -07:00
parent 18a0a81ffc
commit 2fce54102c
6 changed files with 96 additions and 12 deletions
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2
configure.in
View file

@ -123,6 +123,8 @@ AC_ARG_ENABLE(cxx_exceptions,
# C++ exception handling doesn't work too well on x86
case $target_arch in
x86*) enable_cxx_exceptions=no;;
arm*) enable_cxx_exceptions=no;;
mips*) enable_cxx_exceptions=no;;
*) enable_cxx_exceptions=yes;;
esac
])

1
include/unwind.h
View file

@ -88,6 +88,7 @@ extern void _Unwind_DeleteException (struct _Unwind_Exception *);
extern unsigned long _Unwind_GetGR (struct _Unwind_Context *, int);
extern void _Unwind_SetGR (struct _Unwind_Context *, int, unsigned long);
extern unsigned long _Unwind_GetIP (struct _Unwind_Context *);
extern unsigned long _Unwind_GetIPInfo (struct _Unwind_Context *, int *);
extern void _Unwind_SetIP (struct _Unwind_Context *, unsigned long);
extern unsigned long _Unwind_GetLanguageSpecificData (struct _Unwind_Context*);
extern unsigned long _Unwind_GetRegionStart (struct _Unwind_Context *);

18
src/Makefile.am
View file

@ -71,6 +71,12 @@ libunwind_la_SOURCES_local_unwind = \
unwind/RaiseException.c unwind/Resume.c \
unwind/Resume_or_Rethrow.c unwind/SetGR.c unwind/SetIP.c
if ARCH_IA64
libunwind_la_SOURCES_local_unwind += ia64/unwind_GetIPInfo.c
else
libunwind_la_SOURCES_local_unwind += unwind/GetIPInfo.c
endif # ARCH_IA64
# _ReadULEB()/_ReadSLEB() are needed for Intel C++ 8.0 compatibility
libunwind_la_SOURCES_os_linux_local = mi/_ReadULEB.c mi/_ReadSLEB.c
endif
@ -88,21 +94,9 @@ libunwind_la_SOURCES_local_nounwind = \
mi/Lget_fpreg.c mi/Lset_fpreg.c \
mi/Lset_caching_policy.c
# On some platforms, defining _Unwind replacements really upsets
# exception-handling. Turn off those functions for those platforms.
if ARCH_ARM
libunwind_la_SOURCES_local = \
$(libunwind_la_SOURCES_local_nounwind)
else
if ARCH_MIPS
libunwind_la_SOURCES_local = \
$(libunwind_la_SOURCES_local_nounwind)
else
libunwind_la_SOURCES_local = \
$(libunwind_la_SOURCES_local_nounwind) \
$(libunwind_la_SOURCES_local_unwind)
endif # ARCH_MIPS
endif # ARCH_ARM
libunwind_la_SOURCES_os_linux = os-linux.h os-linux.c

43
src/ia64/unwind_GetIPInfo.c Normal file
View file

@ -0,0 +1,43 @@
/* libunwind - a platform-independent unwind library
Copyright (C) 2009 Red Hat
Contributed by Jan Kratochvil <jan.kratochvil@redhat.com>
This file is part of libunwind.
Permission is hereby granted, free of charge, to any person obtaining
a copy of this software and associated documentation files (the
"Software"), to deal in the Software without restriction, including
without limitation the rights to use, copy, modify, merge, publish,
distribute, sublicense, and/or sell copies of the Software, and to
permit persons to whom the Software is furnished to do so, subject to
the following conditions:
The above copyright notice and this permission notice shall be
included in all copies or substantial portions of the Software.
THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE. */
#include "../unwind/unwind-internal.h"
/* gcc/unwind-dw2.c: Retrieve the return address and flag whether that IP is
before or after first not yet fully executed instruction.
IP_BEFORE_INSN ensures leaving IP intact as was designed for ia64. */
PROTECTED unsigned long
_Unwind_GetIPInfo (struct _Unwind_Context *context, int *ip_before_insn)
{
unw_word_t val;
unw_get_reg (&context->cursor, UNW_REG_IP, &val);
*ip_before_insn = 1;
return val;
}
unsigned long __libunwind_Unwind_GetIPInfo (struct _Unwind_Context *, int *)
ALIAS (_Unwind_GetIPInfo);

42
src/unwind/GetIPInfo.c Normal file
View file

@ -0,0 +1,42 @@
/* libunwind - a platform-independent unwind library
Copyright (C) 2009 Red Hat
Contributed by Jan Kratochvil <jan.kratochvil@redhat.com>
This file is part of libunwind.
Permission is hereby granted, free of charge, to any person obtaining
a copy of this software and associated documentation files (the
"Software"), to deal in the Software without restriction, including
without limitation the rights to use, copy, modify, merge, publish,
distribute, sublicense, and/or sell copies of the Software, and to
permit persons to whom the Software is furnished to do so, subject to
the following conditions:
The above copyright notice and this permission notice shall be
included in all copies or substantial portions of the Software.
THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE. */
#include "../unwind/unwind-internal.h"
/* gcc/unwind-dw2.c: Retrieve the return address and flag whether that IP is
before or after first not yet fully executed instruction. */
PROTECTED unsigned long
_Unwind_GetIPInfo (struct _Unwind_Context *context, int *ip_before_insn)
{
unw_word_t val;
unw_get_reg (&context->cursor, UNW_REG_IP, &val);
*ip_before_insn = unw_is_signal_frame (&context->cursor);
return val;
}
unsigned long __libunwind_Unwind_GetIPInfo (struct _Unwind_Context *, int *)
ALIAS (_Unwind_GetIPInfo);

2
tests/check-namespace.sh.in
View file

@ -197,6 +197,7 @@ check_cxx_abi () {
match _Unwind_GetDataRelBase
match _Unwind_GetGR
match _Unwind_GetIP
match _Unwind_GetIPInfo
match _Unwind_GetLanguageSpecificData
match _Unwind_GetRegionStart
match _Unwind_GetTextRelBase
@ -214,6 +215,7 @@ check_cxx_abi () {
match __libunwind_Unwind_GetDataRelBase
match __libunwind_Unwind_GetGR
match __libunwind_Unwind_GetIP
match __libunwind_Unwind_GetIPInfo
match __libunwind_Unwind_GetLanguageSpecificData
match __libunwind_Unwind_GetRegionStart
match __libunwind_Unwind_GetTextRelBase