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Rollback on a DSI exception, for the instructions that need it. 

Not a good thing to say, but this isn't properly tested, since I don't know of any game that generates a DSI exception. I'll try to write some homebrew to test this, but I'm pretty confident it's ok. Anyway, please take a look at it and tell me if you find some mistake :-)


git-svn-id: https://dolphin-emu.googlecode.com/svn/trunk@6172 8ced0084-cf51-0410-be5f-012b33b47a6e
This commit is contained in:
anusko 2010-09-04 01:04:37 +00:00
parent ae309405a5
commit f4a6e585be
1 changed files with 126 additions and 47 deletions
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159
Source/Core/Core/Src/PowerPC/Interpreter/Interpreter_LoadStore.cpp
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@ -195,39 +195,65 @@ void Interpreter::lhzu(UGeckoInstruction _inst)
}
}
// FIXME: lmw should do a total rollback if a DSI occurs
void Interpreter::lmw(UGeckoInstruction _inst)
{
u32 uAddress = Helper_Get_EA(_inst);
for (int iReg = _inst.RD; iReg <= 31; iReg++, uAddress += 4)
u32 EA = Helper_Get_EA(_inst);
int r = _inst.RD;
const int rb_r = r;
static u32 rb_GPR[32];
while (r <= 31)
{
u32 TempReg = Memory::Read_U32(uAddress);
u32 TempReg = Memory::Read_U32(EA);
if (PowerPC::ppcState.Exceptions & EXCEPTION_DSI)
{
PanicAlert("DSI exception in lmw");
NOTICE_LOG(POWERPC, "DSI exception in lmw");
while (r > rb_r)
{
m_GPR[r] = rb_GPR[r];
r--;
}
return;
}
else
{
m_GPR[iReg] = TempReg;
}
rb_GPR[r] = m_GPR[r];
m_GPR[r] = TempReg;
r++;
EA += 4;
}
}
// FIXME: stmw should do a total rollback if a DSI occurs
void Interpreter::stmw(UGeckoInstruction _inst)
{
u32 uAddress = Helper_Get_EA(_inst);
for (int iReg = _inst.RS; iReg <= 31; iReg++, uAddress+=4)
u32 EA = Helper_Get_EA(_inst);
int r = _inst.RS;
const int rb_r = r;
static u32 rb_mem[32];
while (r <= 31)
{
Memory::Write_U32(m_GPR[iReg], uAddress);
rb_mem[r] = Memory::ReadUnchecked_U32(EA);
Memory::Write_U32(m_GPR[r], EA);
if (PowerPC::ppcState.Exceptions & EXCEPTION_DSI)
{
PanicAlert("DSI exception in stmw");
NOTICE_LOG(POWERPC, "DSI exception in stmw");
while (r > rb_r)
{
Memory::WriteUnchecked_U32(rb_mem[r], EA);
r--;
EA -= 4;
}
return;
}
r++;
EA += 4;
}
}
@ -523,7 +549,6 @@ void Interpreter::lhzx(UGeckoInstruction _inst)
}
// TODO: is this right?
// FIXME: Should rollback if a DSI occurs
void Interpreter::lswx(UGeckoInstruction _inst)
{
u32 EA = Helper_Get_EA_X(_inst);
@ -531,8 +556,13 @@ void Interpreter::lswx(UGeckoInstruction _inst)
int r = _inst.RD;
int i = 0;
const u32 rb_EA = EA;
const int rb_r = r;
static u32 rb_GPR[32];
if (n > 0)
{
rb_GPR[r] = m_GPR[r];
m_GPR[r] = 0;
do
{
@ -541,6 +571,17 @@ void Interpreter::lswx(UGeckoInstruction _inst)
{
PanicAlert("DSI exception in lswx.");
NOTICE_LOG(POWERPC, "DSI exception in lswx");
n = ((EA - rb_EA) / 4) + 1;
EA = rb_EA;
r = rb_r;
while (n > 0)
{
m_GPR[r] = rb_GPR[r];
r = (r + 1) & 31;
EA += 4;
n--;
}
return;
}
m_GPR[r] |= TempValue;
@ -552,6 +593,7 @@ void Interpreter::lswx(UGeckoInstruction _inst)
{
i = 0;
r = (r + 1) & 31;
rb_GPR[r] = m_GPR[r];
m_GPR[r] = 0;
}
} while (n > 0);
@ -667,7 +709,6 @@ void Interpreter::sthx(UGeckoInstruction _inst)
// __________________________________________________________________________________________________
// lswi - bizarro string instruction
// FIXME: Should rollback if a DSI occurs
void Interpreter::lswi(UGeckoInstruction _inst)
{
u32 EA;
@ -682,38 +723,55 @@ void Interpreter::lswi(UGeckoInstruction _inst)
else
n = _inst.NB;
int r = _inst.RD - 1;
int r = _inst.RD;
int i = 0;
while (n>0)
{
if (i==0)
{
r++;
r &= 31;
m_GPR[r] = 0;
}
const u32 rb_EA = EA;
const int rb_r = r;
static u32 rb_GPR[32];
if (n > 0)
{
rb_GPR[r] = m_GPR[r];
m_GPR[r] = 0;
do
{
u32 TempValue = Memory::Read_U8(EA) << (24 - i);
if (PowerPC::ppcState.Exceptions & EXCEPTION_DSI)
{
PanicAlert("DSI exception in lsw.");
PanicAlert("DSI exception in lswi.");
n = ((EA - rb_EA) / 4) + 1;
EA = rb_EA;
r = rb_r;
while (n > 0)
{
m_GPR[r] = rb_GPR[r];
r = (r + 1) & 31;
EA += 4;
n--;
}
return;
}
m_GPR[r] |= TempValue;
i += 8;
if (i == 32)
i = 0;
EA++;
n--;
i += 8;
if (i == 32)
{
i = 0;
r = (r + 1) & 31;
rb_GPR[r] = m_GPR[r];
m_GPR[r] = 0;
}
} while (n > 0);
}
}
// todo : optimize ?
// __________________________________________________________________________________________________
// stswi - bizarro string instruction
// FIXME: Should rollback if a DSI occurs
void Interpreter::stswi(UGeckoInstruction _inst)
{
u32 EA;
@ -728,26 +786,47 @@ void Interpreter::stswi(UGeckoInstruction _inst)
else
n = _inst.NB;
int r = _inst.RS - 1;
int r = _inst.RS;
int i = 0;
while (n > 0)
{
if (i == 0)
{
r++;
r &= 31;
}
const u32 rb_EA = EA;
const int rb_r = r;
static u32 rb_mem[32];
while (n > 0) {
rb_mem[r] |= Memory::ReadUnchecked_U8(EA) << (24 - i);
Memory::Write_U8((m_GPR[r] >> (24 - i)) & 0xFF, EA);
if (PowerPC::ppcState.Exceptions & EXCEPTION_DSI)
{
PanicAlert("DSI exception in stswi.");
n = EA - rb_EA;
EA = rb_EA;
r = rb_r;
i = 0;
while (n > 0)
{
Memory::WriteUnchecked_U8((rb_mem[r] >> (24 - i)) & 0xFF, EA);
EA++;
i += 8;
if (i == 32)
{
i = 0;
r = (r + 1) & 31;
}
n--;
}
return;
}
i += 8;
if (i == 32)
i = 0;
EA++;
n--;
i += 8;
if (i == 32)
{
i = 0;
r = (r + 1) & 31;
}
}
}