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32x: overflow handling for X-Men

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git-svn-id: file:///home/notaz/opt/svn/PicoDrive@807 be3aeb3a-fb24-0410-a615-afba39da0efa
This commit is contained in:
notaz 2009-10-06 14:15:37 +00:00
parent ba86b61e50
commit 1625ed0179
1 changed files with 11 additions and 1 deletions
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12
pico/32x/memory.c
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@ -577,6 +577,8 @@ static void sh2_peripheral_write32(u32 a, u32 d, int id)
r[0x118 / 4] = r[0x110 / 4] = (signed int)d % divisor;
r[0x104 / 4] = r[0x11c / 4] = r[0x114 / 4] = (signed int)d / divisor;
}
else
r[0x110 / 4] = r[0x114 / 4] = r[0x118 / 4] = r[0x11c / 4] = 0; // ?
break;
case 0x114:
elprintf(EL_32X, "%csh2 divide %08x%08x / %08x @%08x",
@ -586,8 +588,16 @@ static void sh2_peripheral_write32(u32 a, u32 d, int id)
signed int divisor = r[0x100 / 4];
// XXX: undocumented mirroring to 0x118,0x11c?
r[0x118 / 4] = r[0x110 / 4] = divident % divisor;
r[0x11c / 4] = r[0x114 / 4] = divident / divisor;
divident /= divisor;
r[0x11c / 4] = r[0x114 / 4] = divident;
divident >>= 31;
if ((unsigned long long)divident + 1 > 1) {
//elprintf(EL_32X, "%csh2 divide overflow! @%08x", id ? 's' : 'm', sh2_pc(id));
r[0x11c / 4] = r[0x114 / 4] = divident > 0 ? 0x7fffffff : 0x80000000; // overflow
}
}
else
r[0x110 / 4] = r[0x114 / 4] = r[0x118 / 4] = r[0x11c / 4] = 0; // ?
break;
}