Macintosh-Tools/macemu
1
0
Fork 0
mirror of https://github.com/kanjitalk755/macemu.git synced 2025-01-12 16:30:44 +00:00
Code Issues Projects Releases Wiki Activity

fix mullwo & divw on invalid inputs

Browse Source
This commit is contained in:
gbeauche 2003-11-09 07:19:39 +00:00
parent aebcb7a6bb
commit 59e6227c08
1 changed files with 5 additions and 7 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

12
SheepShaver/src/kpx_cpu/src/cpu/ppc/ppc-execute.cpp
View File

@ -33,7 +33,7 @@
#include "mon_disass.h" #include "mon_disass.h"
#endif #endif
#define DEBUG 1 #define DEBUG 0
#include "debug.h" #include "debug.h"
/** /**
@ -390,13 +390,11 @@ void powerpc_cpu::execute_divide(uint32 opcode)
if (b == 0 || (SB && a == 0x80000000 && b == 0xffffffff)) { if (b == 0 || (SB && a == 0x80000000 && b == 0xffffffff)) {
// Reference manual says rD is undefined // Reference manual says rD is undefined
d = 0; d = 0;
#if 1 if (SB) {
if (SB && b == 0) {
// However, checking against a real PowerPC (7410) yields // However, checking against a real PowerPC (7410) yields
// that rD gets all bits set to rA MSB // that rD gets all bits set to rA MSB
d -= (a >> 31); d = -(a >> 31);
} }
#endif
if (OE::test(opcode)) if (OE::test(opcode))
xer().set_ov(1); xer().set_ov(1);
} }
@ -434,8 +432,8 @@ void powerpc_cpu::execute_multiply(uint32 opcode)
// Overflow if the product cannot be represented in 32 bits // Overflow if the product cannot be represented in 32 bits
if (OE::test(opcode)) { if (OE::test(opcode)) {
const uint32 upper = d >> 32; xer().set_ov((d & UVAL64(0xffffffff80000000)) != 0 &&
xer().set_ov(upper != 0 && upper != 0xffffffff); (d & UVAL64(0xffffffff80000000)) != UVAL64(0xffffffff80000000));
} }
// Only keep high word if multiply high instruction // Only keep high word if multiply high instruction