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more docs few small fixes 

git-svn-id: https://dolphin-emu.googlecode.com/svn/trunk@2920 8ced0084-cf51-0410-be5f-012b33b47a6e
This commit is contained in:
nakeee 2009-04-07 21:03:17 +00:00
parent bae02be45e
commit 1397ca100a
1 changed files with 35 additions and 11 deletions
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46
Source/Plugins/Plugin_DSP_LLE-testing/Src/DSPInterpreter.cpp
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@ -44,6 +44,12 @@ void tsta(int reg)
}
// Generic call implementation
// CALLcc addressA
// 0000 0010 1011 cccc
// aaaa aaaa aaaa aaaa
// Call function if condition cc has been met. Push program counter of
// instruction following "call" to $st0. Set program counter to address
// represented by value that follows this "call" instruction.
void call(const UDSPInstruction& opc)
{
u16 dest = dsp_fetch_code();
@ -56,6 +62,11 @@ void call(const UDSPInstruction& opc)
}
// Generic callr implementation
// CALLRcc $R
// 0001 0111 rrr1 cccc
// Call functionif condition cc has been met.Push program counter of
// instruction following "call" tocall stack $st0. Set program counter to
// register $R.
void callr(const UDSPInstruction& opc)
{
u16 addr;
@ -71,6 +82,9 @@ void callr(const UDSPInstruction& opc)
}
// Generic if implementation
// IFcc
// 0000 0010 0111 cccc
// Execute following opcode if the condition has been met.
void ifcc(const UDSPInstruction& opc)
{
if (!CheckCondition(opc.hex & 0xf))
@ -81,6 +95,11 @@ void ifcc(const UDSPInstruction& opc)
}
// Generic jmp implementation
// Jcc addressA
// 0000 0010 1001 cccc
// aaaa aaaa aaaa aaaa
// Jump to addressA if condition cc has been met. Set program counter to
// address represented by value that follows this "jmp" instruction.
void jcc(const UDSPInstruction& opc)
{
u16 dest = dsp_fetch_code();
@ -92,6 +111,9 @@ void jcc(const UDSPInstruction& opc)
}
// Generic jmpr implementation
// JMPcc $R
// 0001 0111 rrr0 cccc
// Jump to address; set program counter to a value from register $R.
void jmprcc(const UDSPInstruction& opc)
{
u8 reg;
@ -100,10 +122,14 @@ void jmprcc(const UDSPInstruction& opc)
{
reg = (opc.hex >> 5) & 0x7;
g_dsp.pc = dsp_op_read_reg(reg);
}
}
}
// Generic ret implementation
// RETcc
// 0000 0010 1101 cccc
// Return from subroutine if condition cc has been met. Pops stored PC
// from call stack $st0 and sets $pc to this location.
void ret(const UDSPInstruction& opc)
{
if (CheckCondition(opc.hex & 0xf))
@ -629,10 +655,9 @@ void mulcac(const UDSPInstruction& opc)
void movr(const UDSPInstruction& opc)
{
u8 areg = (opc.hex >> 8) & 0x1;
u8 rreg = ((opc.hex >> 9) & 0x1);
u8 sreg = ((opc.hex >> 10) & 0x1) + DSP_REG_AXL0;
u8 sreg = ((opc.hex >> 9) & 0x3) + DSP_REG_AXL0;
s64 acc = (s16)g_dsp.r[sreg + rreg];
s64 acc = (s16)g_dsp.r[sreg];
acc <<= 16;
acc &= ~0xffff;
@ -975,7 +1000,7 @@ void movnp(const UDSPInstruction& opc)
void mov(const UDSPInstruction& opc)
{
u8 D = (opc.hex >> 8) & 0x1;
u16 acc = dsp_get_long_acc(1 - D);
u64 acc = dsp_get_long_acc(1 - D);
dsp_set_long_acc(D, acc);
Update_SR_Register64(acc);
@ -1152,7 +1177,7 @@ void asr16(const UDSPInstruction& opc)
void lsl(const UDSPInstruction& opc)
{
u16 shift = opc.ushift;
u64 acc = dsp_get_long_acc(opc.areg);
s64 acc = dsp_get_long_acc(opc.areg);
acc <<= shift;
dsp_set_long_acc(opc.areg, acc);
@ -1166,8 +1191,8 @@ void lsl(const UDSPInstruction& opc)
// calculated by negating sign extended bits 0-6.
void lsr(const UDSPInstruction& opc)
{
u16 shift = -opc.ushift;
u64 acc = dsp_get_long_acc(opc.areg);
s16 shift = -opc.ushift;
s64 acc = dsp_get_long_acc(opc.areg);
// Lop off the extraneous sign extension our 64-bit fake accum causes
acc &= 0x000000FFFFFFFFFFULL;
acc >>= shift;
@ -1184,7 +1209,7 @@ void asl(const UDSPInstruction& opc)
u16 shift = opc.ushift;
// arithmetic shift
u64 acc = dsp_get_long_acc(opc.areg);
s64 acc = dsp_get_long_acc(opc.areg);
acc <<= shift;
dsp_set_long_acc(opc.areg, acc);
@ -1196,10 +1221,9 @@ void asl(const UDSPInstruction& opc)
// 0001 010r 11ii iiii
// Arithmetically shifts right accumulator $acR by number specified by
// value calculated by negating sign extended bits 0-6.
void asr(const UDSPInstruction& opc)
{
u16 shift = -opc.ushift;
s16 shift = -opc.ushift;
// arithmetic shift
s64 acc = dsp_get_long_acc(opc.areg);