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Fix Dwarf unwind library for UNITS_PER_WORD > sizeof (void *)

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gcc/

2011-08-08  H.J. Lu  <hongjiu.lu@intel.com>

	PR other/48007
	* config.gcc (libgcc_tm_file): Add i386/value-unwind.h for
	Linux/x86.

	* system.h (REG_VALUE_IN_UNWIND_CONTEXT): Poisoned.
	(ASSUME_EXTENDED_UNWIND_CONTEXT): Likewise.

	* unwind-dw2.c (ASSUME_EXTENDED_UNWIND_CONTEXT): New.
	(_Unwind_Context_Reg_Val): Likewise.
	(_Unwind_Get_Unwind_Word): Likewise.
	(_Unwind_Get_Unwind_Context_Reg_Val): Likewise.
	(_Unwind_Context): Use _Unwind_Context_Reg_Val on the reg field.
	(_Unwind_IsExtendedContext): Check ASSUME_EXTENDED_UNWIND_CONTEXT
	for EXTENDED_CONTEXT_BIT.
	(__frame_state_for): Likewise.
	(uw_init_context_1): Likewise.
	(_Unwind_GetGR): Updated.
	(_Unwind_SetGR): Likewise.
	(_Unwind_GetGRPtr): Likewise.
	(_Unwind_SetGRPtr): Likewise.
	(_Unwind_SetGRValue): Likewise.
	(_Unwind_GRByValue): Likewise.
	(uw_install_context_1): Likewise.

	* doc/tm.texi.in: Document REG_VALUE_IN_UNWIND_CONTEXT and
	ASSUME_EXTENDED_UNWIND_CONTEXT.
	* doc/tm.texi: Regenerated.

libgcc/

2011-08-08  H.J. Lu  <hongjiu.lu@intel.com>

	PR other/48007
	* config/i386/value-unwind.h: New.

From-SVN: r177563
This commit is contained in:
H.J. Lu 2011-08-08 13:26:06 +00:00 committed by H.J. Lu
parent b6ee5bef6e
commit cca2207a2d
8 changed files with 158 additions and 18 deletions
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30
gcc/ChangeLog
View File

@ -1,3 +1,33 @@
2011-08-08 H.J. Lu <hongjiu.lu@intel.com>
PR other/48007
* config.gcc (libgcc_tm_file): Add i386/value-unwind.h for
Linux/x86.
* system.h (REG_VALUE_IN_UNWIND_CONTEXT): Poisoned.
(ASSUME_EXTENDED_UNWIND_CONTEXT): Likewise.
* unwind-dw2.c (ASSUME_EXTENDED_UNWIND_CONTEXT): New.
(_Unwind_Context_Reg_Val): Likewise.
(_Unwind_Get_Unwind_Word): Likewise.
(_Unwind_Get_Unwind_Context_Reg_Val): Likewise.
(_Unwind_Context): Use _Unwind_Context_Reg_Val on the reg field.
(_Unwind_IsExtendedContext): Check ASSUME_EXTENDED_UNWIND_CONTEXT
for EXTENDED_CONTEXT_BIT.
(__frame_state_for): Likewise.
(uw_init_context_1): Likewise.
(_Unwind_GetGR): Updated.
(_Unwind_SetGR): Likewise.
(_Unwind_GetGRPtr): Likewise.
(_Unwind_SetGRPtr): Likewise.
(_Unwind_SetGRValue): Likewise.
(_Unwind_GRByValue): Likewise.
(uw_install_context_1): Likewise.
* doc/tm.texi.in: Document REG_VALUE_IN_UNWIND_CONTEXT and
ASSUME_EXTENDED_UNWIND_CONTEXT.
* doc/tm.texi: Regenerated.
2011-08-08 Rainer Orth <ro@CeBiTec.Uni-Bielefeld.DE>
* Makefile.in (gengtype$(exeext)): Add $(LDFLAGS).

1
gcc/config.gcc
View File

@ -2663,6 +2663,7 @@ esac
case ${target} in
i[34567]86-*-linux* | x86_64-*-linux*)
tmake_file="${tmake_file} i386/t-pmm_malloc i386/t-i386"
libgcc_tm_file="${libgcc_tm_file} i386/value-unwind.h"
;;
i[34567]86-*-* | x86_64-*-*)
tmake_file="${tmake_file} i386/t-gmm_malloc i386/t-i386"

18
gcc/doc/tm.texi
View File

@ -3725,6 +3725,24 @@ return @code{@var{regno}}.
@end defmac
@defmac REG_VALUE_IN_UNWIND_CONTEXT
Define this macro if the target stores register values as
@code{_Unwind_Word} type in unwind context. It should be defined if
target register size is larger than the size of @code{void *}. The
default is to store register values as @code{void *} type.
@end defmac
@defmac ASSUME_EXTENDED_UNWIND_CONTEXT
Define this macro to be 1 if the target always uses extended unwind
context with version, args_size and by_value fields. If it is undefined,
it will be defined to 1 when @code{REG_VALUE_IN_UNWIND_CONTEXT} is
defined and 0 otherwise.
@end defmac
@node Elimination
@subsection Eliminating Frame Pointer and Arg Pointer

18
gcc/doc/tm.texi.in
View File

@ -3711,6 +3711,24 @@ return @code{@var{regno}}.
@end defmac
@defmac REG_VALUE_IN_UNWIND_CONTEXT
Define this macro if the target stores register values as
@code{_Unwind_Word} type in unwind context. It should be defined if
target register size is larger than the size of @code{void *}. The
default is to store register values as @code{void *} type.
@end defmac
@defmac ASSUME_EXTENDED_UNWIND_CONTEXT
Define this macro to be 1 if the target always uses extended unwind
context with version, args_size and by_value fields. If it is undefined,
it will be defined to 1 when @code{REG_VALUE_IN_UNWIND_CONTEXT} is
defined and 0 otherwise.
@end defmac
@node Elimination
@subsection Eliminating Frame Pointer and Arg Pointer

3
gcc/system.h
View File

@ -802,7 +802,8 @@ extern void fancy_abort (const char *, int, const char *) ATTRIBUTE_NORETURN;
/* Target macros only used for code built for the target, that have
moved to libgcc-tm.h or have never been present elsewhere. */
#pragma GCC poison DECLARE_LIBRARY_RENAMES LIBGCC2_GNU_PREFIX \
MD_UNWIND_SUPPORT MD_FROB_UPDATE_CONTEXT ENABLE_EXECUTE_STACK
MD_UNWIND_SUPPORT MD_FROB_UPDATE_CONTEXT ENABLE_EXECUTE_STACK \
REG_VALUE_IN_UNWIND_CONTEXT ASSUME_EXTENDED_UNWIND_CONTEXT
/* Other obsolete target macros, or macros that used to be in target
headers and were not used, and may be obsolete or may never have

5
libgcc/ChangeLog
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@ -1,3 +1,8 @@
2011-08-08 H.J. Lu <hongjiu.lu@intel.com>
PR other/48007
* config/i386/value-unwind.h: New.
2011-08-06 Richard Sandiford <rdsandiford@googlemail.com>
* config.host (*-*-darwin*, *-*-freebsd*, *-*-linux*, frv-*-*linux*)

26
libgcc/config/i386/value-unwind.h Normal file
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@ -0,0 +1,26 @@
/* Store register values as _Unwind_Word type in DWARF2 EH unwind context.
Copyright (C) 2011
Free Software Foundation, Inc.
This file is part of GCC.
GCC is free software; you can redistribute it and/or modify it
under the terms of the GNU General Public License as published
by the Free Software Foundation; either version 3, or (at your
option) any later version.
GCC 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 General Public
License for more details.
You should have received a copy of the GNU General Public License and
a copy of the GCC Runtime Library Exception along with this program;
see the files COPYING3 and COPYING.RUNTIME respectively. If not, see
<http://www.gnu.org/licenses/>. */
/* Define this macro if the target stores register values as _Unwind_Word
type in unwind context. Only enable it for x32. */
#if defined __x86_64 && !defined __LP64__
# define REG_VALUE_IN_UNWIND_CONTEXT
#endif

71
libgcc/unwind-dw2.c
View File

@ -59,12 +59,50 @@
#define DWARF_REG_TO_UNWIND_COLUMN(REGNO) (REGNO)
#endif
#ifdef REG_VALUE_IN_UNWIND_CONTEXT
typedef _Unwind_Word _Unwind_Context_Reg_Val;
#ifndef ASSUME_EXTENDED_UNWIND_CONTEXT
#define ASSUME_EXTENDED_UNWIND_CONTEXT 1
#endif
static inline _Unwind_Word
_Unwind_Get_Unwind_Word (_Unwind_Context_Reg_Val val)
{
return val;
}
static inline _Unwind_Context_Reg_Val
_Unwind_Get_Unwind_Context_Reg_Val (_Unwind_Word val)
{
return val;
}
#else
typedef void *_Unwind_Context_Reg_Val;
static inline _Unwind_Word
_Unwind_Get_Unwind_Word (_Unwind_Context_Reg_Val val)
{
return (_Unwind_Word) (_Unwind_Internal_Ptr) val;
}
static inline _Unwind_Context_Reg_Val
_Unwind_Get_Unwind_Context_Reg_Val (_Unwind_Word val)
{
return (_Unwind_Context_Reg_Val) (_Unwind_Internal_Ptr) val;
}
#endif
#ifndef ASSUME_EXTENDED_UNWIND_CONTEXT
#define ASSUME_EXTENDED_UNWIND_CONTEXT 0
#endif
/* This is the register and unwind state for a particular frame. This
provides the information necessary to unwind up past a frame and return
to its caller. */
struct _Unwind_Context
{
void *reg[DWARF_FRAME_REGISTERS+1];
_Unwind_Context_Reg_Val reg[DWARF_FRAME_REGISTERS+1];
void *cfa;
void *ra;
void *lsda;
@ -147,7 +185,8 @@ _Unwind_SetSignalFrame (struct _Unwind_Context *context, int val)
static inline _Unwind_Word
_Unwind_IsExtendedContext (struct _Unwind_Context *context)
{
return context->flags & EXTENDED_CONTEXT_BIT;
return (ASSUME_EXTENDED_UNWIND_CONTEXT
|| (context->flags & EXTENDED_CONTEXT_BIT));
}
/* Get the value of register INDEX as saved in CONTEXT. */
@ -156,7 +195,7 @@ inline _Unwind_Word
_Unwind_GetGR (struct _Unwind_Context *context, int index)
{
int size;
void *ptr;
_Unwind_Context_Reg_Val val;
#ifdef DWARF_ZERO_REG
if (index == DWARF_ZERO_REG)
@ -166,18 +205,18 @@ _Unwind_GetGR (struct _Unwind_Context *context, int index)
index = DWARF_REG_TO_UNWIND_COLUMN (index);
gcc_assert (index < (int) sizeof(dwarf_reg_size_table));
size = dwarf_reg_size_table[index];
ptr = context->reg[index];
val = context->reg[index];
if (_Unwind_IsExtendedContext (context) && context->by_value[index])
return (_Unwind_Word) (_Unwind_Internal_Ptr) ptr;
return _Unwind_Get_Unwind_Word (val);
/* This will segfault if the register hasn't been saved. */
if (size == sizeof(_Unwind_Ptr))
return * (_Unwind_Ptr *) ptr;
return * (_Unwind_Ptr *) (_Unwind_Internal_Ptr) val;
else
{
gcc_assert (size == sizeof(_Unwind_Word));
return * (_Unwind_Word *) ptr;
return * (_Unwind_Word *) (_Unwind_Internal_Ptr) val;
}
}
@ -209,11 +248,11 @@ _Unwind_SetGR (struct _Unwind_Context *context, int index, _Unwind_Word val)
if (_Unwind_IsExtendedContext (context) && context->by_value[index])
{
context->reg[index] = (void *) (_Unwind_Internal_Ptr) val;
context->reg[index] = _Unwind_Get_Unwind_Context_Reg_Val (val);
return;
}
ptr = context->reg[index];
ptr = (void *) (_Unwind_Internal_Ptr) context->reg[index];
if (size == sizeof(_Unwind_Ptr))
* (_Unwind_Ptr *) ptr = val;
@ -232,7 +271,7 @@ _Unwind_GetGRPtr (struct _Unwind_Context *context, int index)
index = DWARF_REG_TO_UNWIND_COLUMN (index);
if (_Unwind_IsExtendedContext (context) && context->by_value[index])
return &context->reg[index];
return context->reg[index];
return (void *) (_Unwind_Internal_Ptr) context->reg[index];
}
/* Set the pointer to a register INDEX as saved in CONTEXT. */
@ -243,7 +282,7 @@ _Unwind_SetGRPtr (struct _Unwind_Context *context, int index, void *p)
index = DWARF_REG_TO_UNWIND_COLUMN (index);
if (_Unwind_IsExtendedContext (context))
context->by_value[index] = 0;
context->reg[index] = p;
context->reg[index] = (_Unwind_Context_Reg_Val) (_Unwind_Internal_Ptr) p;
}
/* Overwrite the saved value for register INDEX in CONTEXT with VAL. */
@ -254,10 +293,10 @@ _Unwind_SetGRValue (struct _Unwind_Context *context, int index,
{
index = DWARF_REG_TO_UNWIND_COLUMN (index);
gcc_assert (index < (int) sizeof(dwarf_reg_size_table));
gcc_assert (dwarf_reg_size_table[index] == sizeof (_Unwind_Ptr));
gcc_assert (dwarf_reg_size_table[index] == sizeof (_Unwind_Context_Reg_Val));
context->by_value[index] = 1;
context->reg[index] = (void *) (_Unwind_Internal_Ptr) val;
context->reg[index] = _Unwind_Get_Unwind_Context_Reg_Val (val);
}
/* Return nonzero if register INDEX is stored by value rather than
@ -1215,6 +1254,7 @@ __frame_state_for (void *pc_target, struct frame_state *state_in)
int reg;
memset (&context, 0, sizeof (struct _Unwind_Context));
if (!ASSUME_EXTENDED_UNWIND_CONTEXT)
context.flags = EXTENDED_CONTEXT_BIT;
context.ra = pc_target + 1;
@ -1453,6 +1493,7 @@ uw_init_context_1 (struct _Unwind_Context *context,
memset (context, 0, sizeof (struct _Unwind_Context));
context->ra = ra;
if (!ASSUME_EXTENDED_UNWIND_CONTEXT)
context->flags = EXTENDED_CONTEXT_BIT;
code = uw_frame_state_for (context, &fs);
@ -1532,8 +1573,8 @@ uw_install_context_1 (struct _Unwind_Context *current,
for (i = 0; i < DWARF_FRAME_REGISTERS; ++i)
{
void *c = current->reg[i];
void *t = target->reg[i];
void *c = (void *) (_Unwind_Internal_Ptr) current->reg[i];
void *t = (void *) (_Unwind_Internal_Ptr)target->reg[i];
gcc_assert (current->by_value[i] == 0);
if (target->by_value[i] && c)