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[patinho] Fixed PUG instruction implementation; Added IDX register to the debugger UI; Implemented boilerplate for the 0xCB I/O instructions.

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This commit is contained in:
Felipe Corrêa da Silva Sanches 2015-11-29 19:58:46 -02:00
parent 59e2a7bb4f
commit 44242c0a93
2 changed files with 30 additions and 7 deletions
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34
src/devices/cpu/patinhofeio/patinho_feio.cpp
View File

@ -15,7 +15,7 @@
#define WRITE_BYTE_PATINHO(A,V) (m_program->write_byte(A,V))
#define READ_INDEX_REG() READ_BYTE_PATINHO(0x000)
#define WRITE_INDEX_REG(V) WRITE_BYTE_PATINHO(0x000, V)
#define WRITE_INDEX_REG(V) { WRITE_BYTE_PATINHO(0x000, V); m_idx = V; }
#define ADDRESS_MASK_4K 0xFFF
#define INCREMENT_PC_4K (PC = (PC+1) & ADDRESS_MASK_4K)
@ -45,6 +45,7 @@ void patinho_feio_cpu_device::device_start()
// Register state for debugger
state_add( PATINHO_FEIO_CI, "CI", m_pc ).mask(0xFFF);
state_add( PATINHO_FEIO_ACC, "ACC", m_acc ).mask(0xFF);
state_add( PATINHO_FEIO_IDX, "IDX", m_idx ).mask(0xFF);
state_add(STATE_GENPC, "GENPC", m_pc).formatstr("0%06O").noshow();
m_icountptr = &m_icount;
@ -55,6 +56,7 @@ void patinho_feio_cpu_device::device_reset()
{
m_pc = 0xE00;
m_acc = 0;
m_idx = READ_INDEX_REG();
m_run = true;
}
@ -78,7 +80,7 @@ void patinho_feio_cpu_device::execute_instruction()
{
debugger_instruction_hook(this, PC);
offs_t addr;
unsigned char tmp;
unsigned char value;
unsigned char opcode = READ_BYTE_PATINHO(PC);
INCREMENT_PC_4K;
@ -116,9 +118,29 @@ void patinho_feio_cpu_device::execute_instruction()
case 0x9E:
//TRI="Troca com Indexador":
// Exchange the value of the accumulator with the index register
tmp = ACC;
value = ACC;
ACC = READ_INDEX_REG();
WRITE_INDEX_REG(tmp);
WRITE_INDEX_REG(value);
return;
case 0xCB:
//Executes I/O functions
//TODO: Implement-me!
value = READ_BYTE_PATINHO(PC);
switch(value & 0xF0){
case 0x10:
printf("Unimplemented FNC /%X%X instruction\n", opcode & 0x0F, value & 0x0F);
break;
case 0x20:
printf("Unimplemented SAL /%X%X instruction\n", opcode & 0x0F, value & 0x0F);
break;
case 0x40:
printf("Unimplemented ENTR /%X0 instruction\n", opcode & 0x0F);
break;
case 0x80:
printf("Unimplemented SAI /%X0 instruction\n", opcode & 0x0F);
break;
}
INCREMENT_PC_4K;
return;
}
@ -135,8 +157,8 @@ void patinho_feio_cpu_device::execute_instruction()
// And then jumps to addr+2
addr = (opcode & 0x0F) << 8 | READ_BYTE_PATINHO(PC);
INCREMENT_PC_4K;
WRITE_BYTE_PATINHO(addr, 0x12);//(PC >> 8) & 0x0F);
WRITE_BYTE_PATINHO(addr+1, 0x34);//PC & 0xFF);
WRITE_BYTE_PATINHO(addr, (PC >> 8) & 0x0F);
WRITE_BYTE_PATINHO(addr+1, PC & 0xFF);
PC = addr+2;
return;
}

3
src/devices/cpu/patinhofeio/patinho_feio.h
View File

@ -8,7 +8,7 @@
/* register IDs */
enum
{
PATINHO_FEIO_CI=1, PATINHO_FEIO_ACC
PATINHO_FEIO_CI=1, PATINHO_FEIO_ACC, PATINHO_FEIO_IDX
};
class patinho_feio_cpu_device : public cpu_device
@ -27,6 +27,7 @@ protected:
int m_acc; /* accumulator (8 bits) */
int m_pc; /* program counter (12 bits)
(CI stands for "Contador de Instrucao") */
int m_idx;
/* processor state flip-flops */
bool m_run; /* processor is running */