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sh2 drc, several bug fixes

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kub 2024-06-09 22:30:51 +00:00
parent a43c77c0e5
commit 31efd4546e
11 changed files with 51 additions and 40 deletions
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11
pico/32x/sh2soc.c
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@ -435,24 +435,25 @@ void REGPARM(3) sh2_peripheral_write32(u32 a, u32 d, SH2 *sh2)
old = r[a / 4];
r[a / 4] = d;
// TODO: DRC doesn't correctly extend 'd' parameter register to 64bit :-/
switch (a) {
// division unit (TODO: verify):
case 0x104: // DVDNT: divident L, starts divide
elprintf_sh2(sh2, EL_32XP, "divide %08x / %08x",
d, r[0x100 / 4]);
r[0x104 / 4], r[0x100 / 4]);
if (r[0x100 / 4]) {
signed int divisor = r[0x100 / 4];
r[0x118 / 4] = r[0x110 / 4] = (signed int)d % divisor;
r[0x104 / 4] = r[0x11c / 4] = r[0x114 / 4] = (signed int)d / divisor;
r[0x118 / 4] = r[0x110 / 4] = (signed int)r[0x104 / 4] % divisor;
r[0x104 / 4] = r[0x11c / 4] = r[0x114 / 4] = (signed int)r[0x104 / 4] / divisor;
}
else
r[0x110 / 4] = r[0x114 / 4] = r[0x118 / 4] = r[0x11c / 4] = 0; // ?
break;
case 0x114:
elprintf_sh2(sh2, EL_32XP, "divide %08x%08x / %08x @%08x",
r[0x110 / 4], d, r[0x100 / 4], sh2_pc(sh2));
r[0x110 / 4], r[0x114 / 4], r[0x100 / 4], sh2_pc(sh2));
if (r[0x100 / 4]) {
signed long long divident = (signed long long)r[0x110 / 4] << 32 | d;
signed long long divident = (signed long long)r[0x110 / 4] << 32 | r[0x114 / 4];
signed int divisor = r[0x100 / 4];
// XXX: undocumented mirroring to 0x118,0x11c?
r[0x118 / 4] = r[0x110 / 4] = divident % divisor;