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[BZ #9726]

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2009-01-11  Ryan S. Arnold  <rsa@us.ibm.com>
	[BZ #9726]
	* sysdeps/powerpc/fpu/tst-setcontext-fpscr.c (_SET_DI_FPSCR,
	_SET_SI_FPSCR): Clobber fp0 to prevent erroneous test-case passes.

2009-01-08  Ryan S. Arnold  <rsa@us.ibm.com>

	[BZ #9726]
	* sysdeps/unix/sysv/linux/powerpc/powerpc32/setcontext-common.S
	(__CONTEXT_FUNC_NAME): Fix mtfsf to use fp31 instead of fp0.
	* sysdeps/unix/sysv/linux/powerpc/powerpc32/swapcontext-common.S
	(__CONTEXT_FUNC_NAME): Fix mtfsf to use fp31 instead of fp0.
This commit is contained in:
Ulrich Drepper 2009-01-30 20:30:46 +00:00
parent a3bd28468c
commit b7219e53bc
4 changed files with 39 additions and 19 deletions
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14
ChangeLog
View File

@ -1,3 +1,17 @@
2009-01-11 Ryan S. Arnold <rsa@us.ibm.com>
[BZ #9726]
* sysdeps/powerpc/fpu/tst-setcontext-fpscr.c (_SET_DI_FPSCR,
_SET_SI_FPSCR): Clobber fp0 to prevent erroneous test-case passes.
2009-01-08 Ryan S. Arnold <rsa@us.ibm.com>
[BZ #9726]
* sysdeps/unix/sysv/linux/powerpc/powerpc32/setcontext-common.S
(__CONTEXT_FUNC_NAME): Fix mtfsf to use fp31 instead of fp0.
* sysdeps/unix/sysv/linux/powerpc/powerpc32/swapcontext-common.S
(__CONTEXT_FUNC_NAME): Fix mtfsf to use fp31 instead of fp0.
2009-01-11 Thomas Schwinge <tschwinge@gnu.org>
* sysdeps/generic/dl-osinfo.h (_dl_setup_stack_chk_guard): Use

10
sysdeps/powerpc/fpu/tst-setcontext-fpscr.c
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@ -1,4 +1,4 @@
/* Copyright (C) 2001,2002,2004,2006,2007,2008 Free Software Foundation, Inc.
/* Copyright (C) 2001,2002,2004,2006-2008,2009 Free Software Foundation, Inc.
This file is part of the GNU C Library.
Contributed by Ryan S. Arnold <rsa@us.ibm.com>
Sean Curry <spcurry@us.ibm.com>
@ -104,12 +104,16 @@ typedef unsigned int si_fpscr_t __attribute__ ((__mode__ (__SI__)));
(__fpscr)=tmp.fpscr; \
tmp.fpscr; })
/* We make sure to zero fp0 after we use it in order to prevent stale data
in an fp register from making a test-case pass erroneously. */
# define _SET_DI_FPSCR(__fpscr) { \
union { double d; di_fpscr_t fpscr; } \
tmp __attribute__ ((__aligned__(8))); \
tmp.fpscr = __fpscr; \
/* Set the entire 64-bit FPSCR. */ \
__asm__ ("lfd%U0 0,%0; mtfsf 255,0,1,0" : : "m" (tmp.d) : "fr0"); \
tmp.d = 0; \
__asm__("lfd%U0 0,%0" : : "m" (tmp.d) : "fr0"); \
}
# define _GET_SI_FPSCR(__fpscr) ({ \
@ -120,6 +124,8 @@ typedef unsigned int si_fpscr_t __attribute__ ((__mode__ (__SI__)));
(__fpscr)=tmp.cw[1]; \
tmp.cw[0]; })
/* We make sure to zero fp0 after we use it in order to prevent stale data
in an fp register from making a test-case pass erroneously. */
# define _SET_SI_FPSCR(__fpscr) { \
union { double d; si_fpscr_t fpscr[2]; } \
tmp __attribute__ ((__aligned__(8))); \
@ -127,6 +133,8 @@ typedef unsigned int si_fpscr_t __attribute__ ((__mode__ (__SI__)));
tmp.fpscr[0] = 0xFFF80000; \
tmp.fpscr[1] = __fpscr; \
__asm__ ("lfd%U0 0,%0; mtfsf 255,0" : : "m" (tmp.d) : "fr0"); \
tmp.d = 0; \
__asm__("lfd%U0 0,%0" : : "m" (tmp.d) : "fr0"); \
}
void prime_special_regs(int which)

5
sysdeps/unix/sysv/linux/powerpc/powerpc32/setcontext-common.S
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@ -1,5 +1,5 @@
/* Jump to a new context powerpc32 common.
Copyright (C) 2005, 2006, 2008 Free Software Foundation, Inc.
Copyright (C) 2005, 2006, 2008, 2009 Free Software Foundation, Inc.
This file is part of the GNU C Library.
The GNU C Library is free software; you can redistribute it and/or
@ -202,7 +202,7 @@ ENTRY(__CONTEXT_FUNC_NAME)
lfd fp0,_UC_FREGS+(0*8)(r31)
# ifdef _ARCH_PWR6
/* Use the extended four-operand version of the mtfsf insn. */
mtfsf 0xff,fp0,1,0
mtfsf 0xff,fp31,1,0
# else
/* Availability of DFP indicates a 64-bit FPSCR. */
andi. r6,r7,PPC_FEATURE_HAS_DFP
@ -304,4 +304,3 @@ ENTRY(__CONTEXT_FUNC_NAME)
/* NOTREACHED */
END (__CONTEXT_FUNC_NAME)

5
sysdeps/unix/sysv/linux/powerpc/powerpc32/swapcontext-common.S
View File

@ -1,5 +1,5 @@
/* Save current context and jump to a new context.
Copyright (C) 2005, 2006, 2008 Free Software Foundation, Inc.
Copyright (C) 2005, 2006, 2008, 2009 Free Software Foundation, Inc.
This file is part of the GNU C Library.
The GNU C Library is free software; you can redistribute it and/or
@ -428,7 +428,7 @@ ENTRY(__CONTEXT_FUNC_NAME)
lfd fp0,_UC_FREGS+(0*8)(r31)
# ifdef _ARCH_PWR6
/* Use the extended four-operand version of the mtfsf insn. */
mtfsf 0xff,fp0,1,0
mtfsf 0xff,fp31,1,0
# else
/* Availability of DFP indicates a 64-bit FPSCR. */
andi. r6,r7,PPC_FEATURE_HAS_DFP
@ -528,4 +528,3 @@ ENTRY(__CONTEXT_FUNC_NAME)
/* NOTREACHED */
END(__CONTEXT_FUNC_NAME)