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Corrects emulation-mode read-modify-writes not to empty the data buffer.

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This commit is contained in:
Thomas Harte 2020-10-09 22:14:42 -04:00
parent b439f40fe2
commit 451f83ba51
4 changed files with 14 additions and 4 deletions
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6
Processors/6502/AllRAM/6502AllRAM.cpp
View File

@ -11,7 +11,7 @@
#include <algorithm>
#include <cstring>
//#define BE_NOISY
#define BE_NOISY
using namespace CPU::MOS6502;
@ -45,14 +45,14 @@ template <Type type> class ConcreteAllRAMProcessor: public AllRAMProcessor, publ
*value = memory_[address];
#ifdef BE_NOISY
// if((address&0xff00) == 0x100) {
printf("%04x -> %02x\n", address, *value);
// printf("%04x -> %02x\n", address, *value);
// }
#endif
} else {
memory_[address] = *value;
#ifdef BE_NOISY
// if((address&0xff00) == 0x100) {
printf("%04x <- %02x\n", address, *value);
// printf("%04x <- %02x\n", address, *value);
// }
#endif
}

4
Processors/65816/Implementation/65816Implementation.hpp
View File

@ -109,6 +109,10 @@ template <typename BusHandler> void Processor<BusHandler>::run_for(const Cycles
write(data_address_, data_buffer_.next_output());
break;
case CycleStoreDataThrowaway:
write(data_address_, data_buffer_.preview_output());
break;
case CycleStoreIncrementData:
write(data_address_, data_buffer_.next_output());
increment_data_address();

2
Processors/65816/Implementation/65816Storage.cpp
View File

@ -157,7 +157,7 @@ struct CPU::WDC65816::ProcessorStorageConstructor {
target(CycleFetchData); // Data [high].
if(!is8bit) target(CycleFetchData); // 16-bit: reread final byte of data.
else target(CycleStoreData); // 8-bit rewrite final byte of data.
else target(CycleStoreDataThrowaway); // 8-bit rewrite final byte of data.
target(OperationPerform); // Perform operation within the data buffer.

6
Processors/65816/Implementation/65816Storage.hpp
View File

@ -31,6 +31,8 @@ enum MicroOp: uint8_t {
/// Stores a byte from the data buffer.
CycleStoreData,
/// Stores the most recent byte placed into the data buffer without removing it.
CycleStoreDataThrowaway,
/// Stores a byte to the data address from the data buffer and increments the data address.
CycleStoreIncrementData,
/// Stores a byte to the data address from the data buffer and decrements the data address.
@ -282,6 +284,10 @@ struct ProcessorStorage {
return next;
}
uint8_t *preview_output() {
return byte(read);
}
uint8_t *next_stack() {
--size;
return byte(size);