AcoSail/kernel_optimize_test
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powerpc: fix giveup_vsx to save registers correctly

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giveup_vsx didn't save the FPU and VMX regsiters.  Change it to be
like giveup_fpr/altivec which save these registers.

Also update call sites where FPU and VMX are already saved to use the
original giveup_vsx (renamed to __giveup_vsx).

Signed-off-by: Michael Neuling <mikey@neuling.org>
Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
This commit is contained in:
Michael Neuling 2008-07-11 16:29:12 +10:00 committed by Benjamin Herrenschmidt
parent 01f4b8b8b8
commit 7c29217096
5 changed files with 16 additions and 7 deletions
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8
arch/powerpc/kernel/misc_64.S
View File

@ -508,12 +508,12 @@ _GLOBAL(giveup_altivec)
#ifdef CONFIG_VSX
/*
* giveup_vsx(tsk)
* Disable VSX for the task given as the argument,
* and save the vector registers in its thread_struct.
* __giveup_vsx(tsk)
* Disable VSX for the task given as the argument.
* Does NOT save vsx registers.
* Enables the VSX for use in the kernel on return.
*/
_GLOBAL(giveup_vsx)
_GLOBAL(__giveup_vsx)
mfmsr r5
oris r5,r5,MSR_VSX@h
mtmsrd r5 /* enable use of VSX now */

10
arch/powerpc/kernel/process.c
View File

@ -159,6 +159,13 @@ void enable_kernel_vsx(void)
EXPORT_SYMBOL(enable_kernel_vsx);
#endif
void giveup_vsx(struct task_struct *tsk)
{
giveup_fpu(tsk);
giveup_altivec(tsk);
__giveup_vsx(tsk);
}
void flush_vsx_to_thread(struct task_struct *tsk)
{
if (tsk->thread.regs) {
@ -290,7 +297,8 @@ struct task_struct *__switch_to(struct task_struct *prev,
#endif /* CONFIG_ALTIVEC */
#ifdef CONFIG_VSX
if (prev->thread.regs && (prev->thread.regs->msr & MSR_VSX))
giveup_vsx(prev);
/* VMX and FPU registers are already save here */
__giveup_vsx(prev);
#endif /* CONFIG_VSX */
#ifdef CONFIG_SPE
/*

2
arch/powerpc/kernel/signal_32.c
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@ -452,7 +452,7 @@ static int save_user_regs(struct pt_regs *regs, struct mcontext __user *frame,
* contains valid data
*/
if (current->thread.used_vsr) {
flush_vsx_to_thread(current);
__giveup_vsx(current);
if (copy_vsx_to_user(&frame->mc_vsregs, current))
return 1;
msr |= MSR_VSX;

2
arch/powerpc/kernel/signal_64.c
View File

@ -122,7 +122,7 @@ static long setup_sigcontext(struct sigcontext __user *sc, struct pt_regs *regs,
* VMX data.
*/
if (current->thread.used_vsr) {
flush_vsx_to_thread(current);
__giveup_vsx(current);
v_regs += ELF_NVRREG;
err |= copy_vsx_to_user(v_regs, current);
/* set MSR_VSX in the MSR value in the frame to

1
include/asm-powerpc/system.h
View File

@ -139,6 +139,7 @@ extern void enable_kernel_altivec(void);
extern void giveup_altivec(struct task_struct *);
extern void load_up_altivec(struct task_struct *);
extern int emulate_altivec(struct pt_regs *);
extern void __giveup_vsx(struct task_struct *);
extern void giveup_vsx(struct task_struct *);
extern void enable_kernel_spe(void);
extern void giveup_spe(struct task_struct *);