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s390/fpu: signals vs. floating point control register

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commit 1b17cb796f upstream.

git commit 904818e2f2
"s390/kernel: introduce fpu-internal.h with fpu helper functions"
introduced the fpregs_store / fp_regs_load helper. These function
fail to save and restore the floating pointer control registers.

The effect is that the FPC is not correctly handled on signal
delivery and signal return.

Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Martin Schwidefsky
2016-02-19 15:29:05 +01:00
committed by Greg Kroah-Hartman
parent d70325085f
commit caa2a2b56b
1 changed files with 2 additions and 0 deletions
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2
arch/s390/include/asm/fpu/internal.h
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@@ -48,6 +48,7 @@ static inline void convert_fp_to_vx(__vector128 *vxrs, freg_t *fprs)
static inline void fpregs_store(_s390_fp_regs *fpregs, struct fpu *fpu) static inline void fpregs_store(_s390_fp_regs *fpregs, struct fpu *fpu)
{ {
fpregs->pad = 0; fpregs->pad = 0;
fpregs->fpc = fpu->fpc;
if (MACHINE_HAS_VX) if (MACHINE_HAS_VX)
convert_vx_to_fp((freg_t *)&fpregs->fprs, fpu->vxrs); convert_vx_to_fp((freg_t *)&fpregs->fprs, fpu->vxrs);
else else
@@ -57,6 +58,7 @@ static inline void fpregs_store(_s390_fp_regs *fpregs, struct fpu *fpu)
static inline void fpregs_load(_s390_fp_regs *fpregs, struct fpu *fpu) static inline void fpregs_load(_s390_fp_regs *fpregs, struct fpu *fpu)
{ {
fpu->fpc = fpregs->fpc;
if (MACHINE_HAS_VX) if (MACHINE_HAS_VX)
convert_fp_to_vx(fpu->vxrs, (freg_t *)&fpregs->fprs); convert_fp_to_vx(fpu->vxrs, (freg_t *)&fpregs->fprs);
else else