6502/CLK
1
0
Fork 0
mirror of https://github.com/TomHarte/CLK.git synced 2024-11-26 08:49:37 +00:00
Code Issues Projects Releases Wiki Activity

Adds absolute long, x.

Browse Source 
Factors out the commonality of a closing read/write while I'm here.
This commit is contained in:
Thomas Harte 2020-09-25 19:27:17 -04:00
parent 2b7ffcd48f
commit 8c11df52bf
2 changed files with 43 additions and 33 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

75
Processors/65816/Implementation/65816Storage.cpp
View File

@ -120,24 +120,29 @@ struct CPU::WDC65816::ProcessorStorageConstructor {
3) the data address is undefined.
*/
// 1a. Absolute a.
static void absolute(AccessType type, bool is8bit, const std::function<void(MicroOp)> &target) {
target(CycleFetchIncrementPC); // AAL.
target(CycleFetchIncrementPC); // AAH.
target(OperationConstructAbsolute); // Calculate data address.
// Performs the closing 8- or 16-bit read or write common to many modes below.
static void read_write(AccessType type, bool is8bit, const std::function<void(MicroOp)> &target) {
if(type == AccessType::Write) {
target(OperationPerform); // Perform operation to fill the data buffer.
if(!is8bit) target(CycleStoreIncrementData); // Data low.
target(CycleStoreData); // Data [high].
} else {
if(!is8bit) target(CycleFetchIncrementData); // Data low.
target(CycleFetchIncrementData); // Data [high].
target(CycleFetchData); // Data [high].
target(OperationPerform); // Perform operation from the data buffer.
}
}
// 1a. Absolute; a.
static void absolute(AccessType type, bool is8bit, const std::function<void(MicroOp)> &target) {
target(CycleFetchIncrementPC); // AAL.
target(CycleFetchIncrementPC); // AAH.
target(OperationConstructAbsolute); // Calculate data address.
read_write(type, is8bit, target);
};
// 1b. Absolute a, JMP.
// 1b. Absolute; a, JMP.
static void absolute_jmp(AccessType, bool, const std::function<void(MicroOp)> &target) {
target(CycleFetchIncrementPC); // New PCL.
target(CycleFetchPC); // New PCH.
@ -145,7 +150,7 @@ struct CPU::WDC65816::ProcessorStorageConstructor {
target(OperationPerform); // [JMP]
};
// 1c. Absolute a, JSR.
// 1c. Absolute; a, JSR.
static void absolute_jsr(AccessType, bool, const std::function<void(MicroOp)> &target) {
target(CycleFetchIncrementPC); // New PCL.
target(CycleFetchPC); // New PCH.
@ -156,7 +161,7 @@ struct CPU::WDC65816::ProcessorStorageConstructor {
target(CyclePush); // PCL
};
// 1d. Absolute read-modify-write.
// 1d. Absolute; a, read-modify-write.
static void absolute_rmw(AccessType, bool is8bit, const std::function<void(MicroOp)> &target) {
target(CycleFetchIncrementPC); // AAL.
target(CycleFetchIncrementPC); // AAH.
@ -174,7 +179,7 @@ struct CPU::WDC65816::ProcessorStorageConstructor {
target(CycleStoreData); // Data [low].
};
// 2a. Absolute Indexed Indirect (a, x), JMP.
// 2a. Absolute Indexed Indirect; (a, x), JMP.
static void absolute_indexed_indirect_jmp(AccessType, bool, const std::function<void(MicroOp)> &target) {
target(CycleFetchIncrementPC); // AAL.
target(CycleFetchPC); // AAH.
@ -185,7 +190,7 @@ struct CPU::WDC65816::ProcessorStorageConstructor {
target(OperationPerform); // [JMP]
};
// 2b. Absolute Indexed Indirect (a, x), JSR.
// 2b. Absolute Indexed Indirect; (a, x), JSR.
static void absolute_indexed_indirect_jsr(AccessType, bool, const std::function<void(MicroOp)> &target) {
target(CycleFetchIncrementPC); // AAL.
@ -202,7 +207,7 @@ struct CPU::WDC65816::ProcessorStorageConstructor {
target(OperationPerform); // ['JSR' (actually: JMP will do)]
}
// 3a. Absolute Indirect (a), JML.
// 3a. Absolute Indirect; (a), JML.
static void absolute_indirect_jml(AccessType, bool, const std::function<void(MicroOp)> &target) {
target(CycleFetchIncrementPC); // New AAL.
target(CycleFetchPC); // New AAH.
@ -215,7 +220,7 @@ struct CPU::WDC65816::ProcessorStorageConstructor {
target(OperationPerform); // [JML]
};
// 3b. Absolute Indirect (a), JMP.
// 3b. Absolute Indirect; (a), JMP.
static void absolute_indirect_jmp(AccessType, bool, const std::function<void(MicroOp)> &target) {
target(CycleFetchIncrementPC); // New AAL.
target(CycleFetchPC); // New AAH.
@ -227,7 +232,7 @@ struct CPU::WDC65816::ProcessorStorageConstructor {
target(OperationPerform); // [JMP]
};
// 4a. Absolute long al.
// 4a. Absolute long; al.
static void absolute_long(AccessType type, bool is8bit, const std::function<void(MicroOp)> &target) {
target(CycleFetchIncrementPC); // AAL.
target(CycleFetchIncrementPC); // AAH.
@ -235,18 +240,10 @@ struct CPU::WDC65816::ProcessorStorageConstructor {
target(OperationConstructAbsolute); // Calculate data address.
if(type == AccessType::Write) {
target(OperationPerform); // Perform operation to fill the data buffer.
if(!is8bit) target(CycleStoreIncrementData); // Data low.
target(CycleStoreData); // Data [high].
} else {
if(!is8bit) target(CycleFetchIncrementData); // Data low.
target(CycleFetchData); // Data [high].
target(OperationPerform); // Perform operation from the data buffer.
}
read_write(type, is8bit, target);
};
// 4b. Absolute long al, JMP.
// 4b. Absolute long; al, JMP.
static void absolute_long_jmp(AccessType, bool, const std::function<void(MicroOp)> &target) {
target(CycleFetchIncrementPC); // New PCL.
target(CycleFetchIncrementPC); // New PCH.
@ -273,8 +270,20 @@ struct CPU::WDC65816::ProcessorStorageConstructor {
target(CyclePush); // PCH
target(CyclePush); // PCL
};
// 5. Absolute long, X; al, x.
static void absolute_long_x(AccessType type, bool is8bit, const std::function<void(MicroOp)> &target) {
target(CycleFetchIncrementPC); // AAL.
target(CycleFetchIncrementPC); // AAH.
target(CycleFetchIncrementPC); // AAB.
target(OperationConstructAbsoluteLongX); // Calculate data address.
read_write(type, is8bit, target);
}
};
// TEMPORARY. Kneejerk way to get a step debug of 65816 storage construction.
ProcessorStorage TEMPORARY_test_instance;
ProcessorStorage::ProcessorStorage() {
@ -315,7 +324,7 @@ ProcessorStorage::ProcessorStorage() {
/* 0x1c TRB a */
/* 0x1d ORA a, x */
/* 0x1e ASL a, x */
/* 0x1f ORA al, x */
/* 0x1f ORA al, x */ op(absolute_long_x, ORA);
/* 0x20 JSR a */ op(absolute_jsr, JSR);
/* 0x21 ORA (d), y */
@ -349,7 +358,7 @@ ProcessorStorage::ProcessorStorage() {
/* 0x3c BIT a, x */
/* 0x3d AND a, x */
/* 0x3e TLD a, x */
/* 0x3f AND al, x */
/* 0x3f AND al, x */ op(absolute_long_x, AND);
/* 0x40 RTI s */
/* 0x41 EOR (d, x) */
@ -383,7 +392,7 @@ ProcessorStorage::ProcessorStorage() {
/* 0x5c JMP al */ op(absolute_long_jmp, JML); // [sic]; this updates PBR so it's JML.
/* 0x5d EOR a, x */
/* 0x5e LSR a, x */
/* 0x5f EOR al, x */
/* 0x5f EOR al, x */ op(absolute_long_x, EOR);
/* 0x60 RTS s */
/* 0x61 ADC (d, x) */
@ -417,7 +426,7 @@ ProcessorStorage::ProcessorStorage() {
/* 0x7c JMP (a, x) */ op(absolute_indexed_indirect_jmp, JMP);
/* 0x7d ADC a, x */
/* 0x7e ROR a, x */
/* 0x7f ADC al, x */
/* 0x7f ADC al, x */ op(absolute_long_x, ADC);
/* 0x80 BRA r */
/* 0x81 STA (d, x) */
@ -451,7 +460,7 @@ ProcessorStorage::ProcessorStorage() {
/* 0x9c STZ a */ op(absolute, STZ);
/* 0x9d STA a, x */
/* 0x9e STZ a, x */
/* 0x9f STA al, x */
/* 0x9f STA al, x */ op(absolute_long_x, STA);
/* 0xa0 LDY # */
/* 0xa1 LDA (d, x) */
@ -485,7 +494,7 @@ ProcessorStorage::ProcessorStorage() {
/* 0xbc LDY a, x */
/* 0xbd LDA a, x */
/* 0xbe LDX a, y */
/* 0xbf LDA al, x */
/* 0xbf LDA al, x */ op(absolute_long_x, LDA);
/* 0xc0 CPY # */
/* 0xc1 CMP (d, x) */
@ -519,7 +528,7 @@ ProcessorStorage::ProcessorStorage() {
/* 0xdc JML (a) */ op(absolute_indirect_jml, JML);
/* 0xdd CMP a, x */
/* 0xde DEC a, x */
/* 0xdf CMP al, x */
/* 0xdf CMP al, x */ op(absolute_long_x, CMP);
/* 0xe0 CPX # */
/* 0xe1 SBC (d, x) */
@ -553,7 +562,7 @@ ProcessorStorage::ProcessorStorage() {
/* 0xfc JSR (a, x) */ op(absolute_indexed_indirect_jsr, JMP); // [sic]
/* 0xfd SBC a, x */
/* 0xfe INC a, x */
/* 0xff SBC al, x */
/* 0xff SBC al, x */ op(absolute_long_x, SBC);
#undef op

1
Processors/65816/Implementation/65816Storage.hpp
View File

@ -37,6 +37,7 @@ enum MicroOp: uint8_t {
/// Sets the data address to the result of (a, x).
/// TODO: explain better once implemented.
OperationConstructAbsoluteIndexedIndirect,
OperationConstructAbsoluteLongX,
/// Performs whatever operation goes with this program.
OperationPerform,