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| author | Olivier Danet <odanet@caramail.com> | 2014-03-21 02:25:19 +0100 |
|---|---|---|
| committer | Mark Cave-Ayland <mark.cave-ayland@ilande.co.uk> | 2014-03-26 23:40:40 +0000 |
| commit | 6a5b69a959483c7404576a7dc54221ced41e6515 (patch) | |
| tree | 0fcc76ec56735b99521a6c53762bb59787920120 /target-sparc/helper.c | |
| parent | db237e33c08a279f0179f8f5128a6d10d9adc38a (diff) | |
| download | qemu-6a5b69a959483c7404576a7dc54221ced41e6515.tar.gz qemu-6a5b69a959483c7404576a7dc54221ced41e6515.tar.bz2 qemu-6a5b69a959483c7404576a7dc54221ced41e6515.zip | |
target-sparc: fix 32bit integer division overflow
The signed integer division -0x8000_0000_0000_0000 / -1 must be handled
separately to avoid an overflow on the QEMU host.
Negative overflow must be a negative number for correct sign
extension in Sparc64 mode. Use <stdint.h> constants.
Signed-off-by: Olivier Danet <odanet@caramail.com>
Signed-off-by: Mark Cave-Ayland <mark.cave-ayland@ilande.co.uk>
Diffstat (limited to 'target-sparc/helper.c')
| -rw-r--r-- | target-sparc/helper.c | 17 |
1 files changed, 10 insertions, 7 deletions
diff --git a/target-sparc/helper.c b/target-sparc/helper.c index f3c7fbf993..ae7740bca1 100644 --- a/target-sparc/helper.c +++ b/target-sparc/helper.c @@ -85,8 +85,8 @@ static target_ulong helper_udiv_common(CPUSPARCState *env, target_ulong a, } x0 = x0 / x1; - if (x0 > 0xffffffff) { - x0 = 0xffffffff; + if (x0 > UINT32_MAX) { + x0 = UINT32_MAX; overflow = 1; } @@ -122,12 +122,15 @@ static target_ulong helper_sdiv_common(CPUSPARCState *env, target_ulong a, if (x1 == 0) { cpu_restore_state(CPU(cpu), GETPC()); helper_raise_exception(env, TT_DIV_ZERO); - } - - x0 = x0 / x1; - if ((int32_t) x0 != x0) { - x0 = x0 < 0 ? 0x80000000 : 0x7fffffff; + } else if (x1 == -1 && x0 == INT64_MIN) { + x0 = INT32_MAX; overflow = 1; + } else { + x0 = x0 / x1; + if ((int32_t) x0 != x0) { + x0 = x0 < 0 ? INT32_MIN : INT32_MAX; + overflow = 1; + } } if (cc) { |