diff options
| author | bellard <bellard@c046a42c-6fe2-441c-8c8c-71466251a162> | 2005-07-23 20:21:38 +0000 |
|---|---|---|
| committer | bellard <bellard@c046a42c-6fe2-441c-8c8c-71466251a162> | 2005-07-23 20:21:38 +0000 |
| commit | 45bbbb466cf4a6280076ea5a51f67ef5bedee345 (patch) | |
| tree | ffa07d8676ab65b3c52370ca3c80c320b72aa96f /target-i386/op.c | |
| parent | d592d3033d7bc41db6159e9387591a216e3c46e0 (diff) | |
added overflow exceptions in divisions
git-svn-id: svn://svn.savannah.nongnu.org/qemu/trunk@1521 c046a42c-6fe2-441c-8c8c-71466251a162
Diffstat (limited to 'target-i386/op.c')
| -rw-r--r-- | target-i386/op.c | 21 |
1 files changed, 16 insertions, 5 deletions
diff --git a/target-i386/op.c b/target-i386/op.c index 3574576ab8..142b662635 100644 --- a/target-i386/op.c +++ b/target-i386/op.c @@ -328,7 +328,6 @@ void OPPROTO op_imulq_T0_T1(void) #endif /* division, flags are undefined */ -/* XXX: add exceptions for overflow */ void OPPROTO op_divb_AL_T0(void) { @@ -339,7 +338,10 @@ void OPPROTO op_divb_AL_T0(void) if (den == 0) { raise_exception(EXCP00_DIVZ); } - q = (num / den) & 0xff; + q = (num / den); + if (q > 0xff) + raise_exception(EXCP00_DIVZ); + q &= 0xff; r = (num % den) & 0xff; EAX = (EAX & ~0xffff) | (r << 8) | q; } @@ -353,7 +355,10 @@ void OPPROTO op_idivb_AL_T0(void) if (den == 0) { raise_exception(EXCP00_DIVZ); } - q = (num / den) & 0xff; + q = (num / den); + if (q != (int8_t)q) + raise_exception(EXCP00_DIVZ); + q &= 0xff; r = (num % den) & 0xff; EAX = (EAX & ~0xffff) | (r << 8) | q; } @@ -367,7 +372,10 @@ void OPPROTO op_divw_AX_T0(void) if (den == 0) { raise_exception(EXCP00_DIVZ); } - q = (num / den) & 0xffff; + q = (num / den); + if (q > 0xffff) + raise_exception(EXCP00_DIVZ); + q &= 0xffff; r = (num % den) & 0xffff; EAX = (EAX & ~0xffff) | q; EDX = (EDX & ~0xffff) | r; @@ -382,7 +390,10 @@ void OPPROTO op_idivw_AX_T0(void) if (den == 0) { raise_exception(EXCP00_DIVZ); } - q = (num / den) & 0xffff; + q = (num / den); + if (q != (int16_t)q) + raise_exception(EXCP00_DIVZ); + q &= 0xffff; r = (num % den) & 0xffff; EAX = (EAX & ~0xffff) | q; EDX = (EDX & ~0xffff) | r; |