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Merge remote-tracking branch 'remotes/mcayland/qemu-sparc' into staging

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* remotes/mcayland/qemu-sparc:
  target-sparc: fix 32bit integer division overflow

Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
This commit is contained in:
Peter Maydell 2014-03-27 10:54:17 +00:00
commit bea4acda3b
1 changed files with 10 additions and 7 deletions
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17
target-sparc/helper.c
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@ -85,8 +85,8 @@ static target_ulong helper_udiv_common(CPUSPARCState *env, target_ulong a,
} }
x0 = x0 / x1; x0 = x0 / x1;
if (x0 > 0xffffffff) { if (x0 > UINT32_MAX) {
x0 = 0xffffffff; x0 = UINT32_MAX;
overflow = 1; overflow = 1;
} }
@ -122,12 +122,15 @@ static target_ulong helper_sdiv_common(CPUSPARCState *env, target_ulong a,
if (x1 == 0) { if (x1 == 0) {
cpu_restore_state(CPU(cpu), GETPC()); cpu_restore_state(CPU(cpu), GETPC());
helper_raise_exception(env, TT_DIV_ZERO); helper_raise_exception(env, TT_DIV_ZERO);
} } else if (x1 == -1 && x0 == INT64_MIN) {
x0 = INT32_MAX;
x0 = x0 / x1;
if ((int32_t) x0 != x0) {
x0 = x0 < 0 ? 0x80000000 : 0x7fffffff;
overflow = 1; overflow = 1;
} else {
x0 = x0 / x1;
if ((int32_t) x0 != x0) {
x0 = x0 < 0 ? INT32_MIN : INT32_MAX;
overflow = 1;
}
} }
if (cc) { if (cc) {