piwalker/melonDS
1
0
Fork 0
mirror of https://github.com/melonDS-emu/melonDS.git synced 2025-07-24 06:39:58 -06:00
Code Issues Packages Projects Releases Wiki Activity

* implement the last missing instructions. QADD is not good according to ARMWrestler, but it doesn't make sense. TODO: investigate.

Browse Source 
* buttons A and B
* silence 'unknown IO write' for 3D GPU ports
This commit is contained in:
StapleButter
2017-01-31 18:41:31 +01:00
parent 516bc30ee3
commit 9541d17c7c
7 changed files with 220 additions and 22 deletions
Download Patch File Download Diff File Expand all files Collapse all files

179
ARMInterpreter_ALU.cpp
View File

@ -863,6 +863,101 @@ void A_SMLAL(ARM* cpu)
cpu->Cycles += cycles;
}
void A_SMLAxy(ARM* cpu)
{
// TODO: ARM9 only
u32 rm = cpu->R[cpu->CurInstr & 0xF];
u32 rs = cpu->R[(cpu->CurInstr >> 8) & 0xF];
u32 rn = cpu->R[(cpu->CurInstr >> 12) & 0xF];
if (cpu->CurInstr & (1<<5)) rm >>= 16;
else rm &= 0xFFFF;
if (cpu->CurInstr & (1<<6)) rs >>= 16;
else rs &= 0xFFFF;
u32 res_mul = ((s16)rm * (s16)rs);
u32 res = res_mul + rn;
cpu->R[(cpu->CurInstr >> 16) & 0xF] = res;
if (OVERFLOW_ADD(res_mul, rn, res))
cpu->CPSR |= 0x08000000;
}
void A_SMLAWy(ARM* cpu)
{
// TODO: ARM9 only
u32 rm = cpu->R[cpu->CurInstr & 0xF];
u32 rs = cpu->R[(cpu->CurInstr >> 8) & 0xF];
u32 rn = cpu->R[(cpu->CurInstr >> 12) & 0xF];
if (cpu->CurInstr & (1<<6)) rs >>= 16;
else rs &= 0xFFFF;
u32 res_mul = ((s32)rm * (s16)rs) >> 16; // CHECKME
u32 res = res_mul + rn;
cpu->R[(cpu->CurInstr >> 16) & 0xF] = res;
if (OVERFLOW_ADD(res_mul, rn, res))
cpu->CPSR |= 0x08000000;
}
void A_SMULxy(ARM* cpu)
{
// TODO: ARM9 only
u32 rm = cpu->R[cpu->CurInstr & 0xF];
u32 rs = cpu->R[(cpu->CurInstr >> 8) & 0xF];
if (cpu->CurInstr & (1<<5)) rm >>= 16;
else rm &= 0xFFFF;
if (cpu->CurInstr & (1<<6)) rs >>= 16;
else rs &= 0xFFFF;
u32 res = ((s16)rm * (s16)rs);
cpu->R[(cpu->CurInstr >> 16) & 0xF] = res;
}
void A_SMULWy(ARM* cpu)
{
// TODO: ARM9 only
u32 rm = cpu->R[cpu->CurInstr & 0xF];
u32 rs = cpu->R[(cpu->CurInstr >> 8) & 0xF];
if (cpu->CurInstr & (1<<6)) rs >>= 16;
else rs &= 0xFFFF;
u32 res = ((s32)rm * (s16)rs) >> 16; // CHECKME
cpu->R[(cpu->CurInstr >> 16) & 0xF] = res;
}
void A_SMLALxy(ARM* cpu)
{
// TODO: ARM9 only
u32 rm = cpu->R[cpu->CurInstr & 0xF];
u32 rs = cpu->R[(cpu->CurInstr >> 8) & 0xF];
if (cpu->CurInstr & (1<<5)) rm >>= 16;
else rm &= 0xFFFF;
if (cpu->CurInstr & (1<<6)) rs >>= 16;
else rs &= 0xFFFF;
s64 res = (s64)(s16)rm * (s64)(s16)rs;
s64 rd = (s64)((u64)cpu->R[(cpu->CurInstr >> 12) & 0xF] | ((u64)cpu->R[(cpu->CurInstr >> 16) & 0xF] << 32ULL));
res += rd;
cpu->R[(cpu->CurInstr >> 12) & 0xF] = (u32)res;
cpu->R[(cpu->CurInstr >> 16) & 0xF] = (u32)(res >> 32ULL);
cpu->Cycles += 1;
}
void A_CLZ(ARM* cpu)
@ -888,6 +983,90 @@ void A_CLZ(ARM* cpu)
cpu->R[(cpu->CurInstr >> 12) & 0xF] = res;
}
void A_QADD(ARM* cpu)
{
// TODO: ARM9 only
u32 rm = cpu->R[cpu->CurInstr & 0xF];
u32 rn = cpu->R[(cpu->CurInstr >> 16) & 0xF];
u32 res = rm + rn;
if (OVERFLOW_ADD(rm, rn, res))
{
res = (res & 0x80000000) ? 0x7FFFFFFF : 0x80000000;
cpu->CPSR |= 0x08000000;
}
cpu->R[(cpu->CurInstr >> 16) & 0xF] = res;
}
void A_QSUB(ARM* cpu)
{
// TODO: ARM9 only
u32 rm = cpu->R[cpu->CurInstr & 0xF];
u32 rn = cpu->R[(cpu->CurInstr >> 16) & 0xF];
u32 res = rm - rn;
if (OVERFLOW_SUB(rm, rn, res))
{
res = (res & 0x80000000) ? 0x7FFFFFFF : 0x80000000;
cpu->CPSR |= 0x08000000;
}
cpu->R[(cpu->CurInstr >> 16) & 0xF] = res;
}
void A_QDADD(ARM* cpu)
{
// TODO: ARM9 only
u32 rm = cpu->R[cpu->CurInstr & 0xF];
u32 rn = cpu->R[(cpu->CurInstr >> 16) & 0xF];
if (rn & 0x40000000)
{
rn = (rn & 0x80000000) ? 0x80000000 : 0x7FFFFFFF;
cpu->CPSR |= 0x08000000; // CHECKME
}
else
rn <<= 1;
u32 res = rm + rn;
if (OVERFLOW_ADD(rm, rn, res))
{
res = (res & 0x80000000) ? 0x7FFFFFFF : 0x80000000;
cpu->CPSR |= 0x08000000;
}
cpu->R[(cpu->CurInstr >> 16) & 0xF] = res;
}
void A_QDSUB(ARM* cpu)
{
// TODO: ARM9 only
u32 rm = cpu->R[cpu->CurInstr & 0xF];
u32 rn = cpu->R[(cpu->CurInstr >> 16) & 0xF];
if (rn & 0x40000000)
{
rn = (rn & 0x80000000) ? 0x80000000 : 0x7FFFFFFF;
cpu->CPSR |= 0x08000000; // CHECKME
}
else
rn <<= 1;
u32 res = rm - rn;
if (OVERFLOW_SUB(rm, rn, res))
{
res = (res & 0x80000000) ? 0x7FFFFFFF : 0x80000000;
cpu->CPSR |= 0x08000000;
}
cpu->R[(cpu->CurInstr >> 16) & 0xF] = res;
}
// ---- THUMB ----------------------------------