diff options
| author | Martin Schwidefsky <schwidefsky@de.ibm.com> | 2013-10-15 18:08:34 +0400 |
|---|---|---|
| committer | Martin Schwidefsky <schwidefsky@de.ibm.com> | 2013-10-24 19:17:11 +0400 |
| commit | 4725c86055f5bbdcdfe47199c0715881893a2c79 (patch) | |
| tree | e201bd8d8a11e58117e9ecf360f3fab43c6267e9 /arch/s390/math-emu | |
| parent | 01a7cfa24afd8e18ce691d3c2f1e1f093cf3a900 (diff) | |
| download | linux-4725c86055f5bbdcdfe47199c0715881893a2c79.tar.xz | |
s390: fix save and restore of the floating-point-control register
The FPC_VALID_MASK has been used to check the validity of the value
to be loaded into the floating-point-control register. With the
introduction of the floating-point extension facility and the
decimal-floating-point additional bits have been defined which need
to be checked in a non straight forward way. So far these bits have
been ignored which can cause an incorrect results for decimal-
floating-point operations, e.g. an incorrect rounding mode to be
set after signal return.
The static check with the FPC_VALID_MASK is replaced with a trial
load of the floating-point-control value, see test_fp_ctl.
In addition an information leak with the padding word between the
floating-point-control word and the floating-point registers in
the s390_fp_regs is fixed.
Reported-by: Heiko Carstens <heiko.carstens@de.ibm.com>
Reviewed-by: Heiko Carstens <heiko.carstens@de.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
Diffstat (limited to 'arch/s390/math-emu')
| -rw-r--r-- | arch/s390/math-emu/math.c | 2 |
1 files changed, 2 insertions, 0 deletions
diff --git a/arch/s390/math-emu/math.c b/arch/s390/math-emu/math.c index 58bff541fde9..a6ba0d724335 100644 --- a/arch/s390/math-emu/math.c +++ b/arch/s390/math-emu/math.c @@ -19,6 +19,8 @@ #include <math-emu/double.h> #include <math-emu/quad.h> +#define FPC_VALID_MASK 0xF8F8FF03 + /* * I miss a macro to round a floating point number to the * nearest integer in the same floating point format. |