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https://github.com/pevans/erc-c.git
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Change 16-bit references to respect little-endianness
As the Apple II (or rather the 6502 chip) is little-endian, meaning the least significant byte is the first byte you read going forward, rather than the last byte.
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@ -44,8 +44,8 @@ static int addr_modes[] = {
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#define ADDR_HILO(cpu) \
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vm_16bit addr; \
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vm_8bit hi, lo; \
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hi = mos6502_next_byte(cpu); \
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lo = mos6502_next_byte(cpu); \
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hi = mos6502_next_byte(cpu); \
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addr = (hi << 8) | lo
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/*
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@ -155,8 +155,8 @@ DEFINE_ADDR(ind)
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ADDR_HILO(cpu);
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ind_hi = vm_segment_get(cpu->memory, addr);
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ind_lo = vm_segment_get(cpu->memory, addr + 1);
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ind_lo = vm_segment_get(cpu->memory, addr);
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ind_hi = vm_segment_get(cpu->memory, addr + 1);
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EFF_ADDR((ind_hi << 8) | ind_lo);
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return vm_segment_get(cpu->memory, eff_addr);
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@ -157,8 +157,8 @@ vm_segment_get16(vm_segment *segment, size_t addr)
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{
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vm_16bit msb, lsb;
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msb = (vm_16bit)vm_segment_get(segment, addr);
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lsb = (vm_16bit)vm_segment_get(segment, addr+1);
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lsb = (vm_16bit)vm_segment_get(segment, addr);
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msb = (vm_16bit)vm_segment_get(segment, addr+1);
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return (msb << 8) | lsb;
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}
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@ -128,8 +128,8 @@ Test(apple2, set_memory)
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Test(apple2, reset)
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{
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apple2_set_memory(mach, MEMORY_BANK_ROM);
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vm_segment_set(mach->rom, 0x2FFC, 0x12);
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vm_segment_set(mach->rom, 0x2FFD, 0x34);
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vm_segment_set(mach->rom, 0x2FFC, 0x34);
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vm_segment_set(mach->rom, 0x2FFD, 0x12);
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apple2_reset(mach);
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cr_assert_eq(mach->cpu->PC, 0x1234);
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@ -22,16 +22,16 @@ Test(mos6502_addr, addr_mode_acc)
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Test(mos6502_addr, addr_mode_abs)
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{
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vm_segment_set(cpu->memory, 0x1234, 111);
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SET_PC_BYTE(cpu, 0, 0x12);
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SET_PC_BYTE(cpu, 1, 0x34);
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SET_PC_BYTE(cpu, 0, 0x34);
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SET_PC_BYTE(cpu, 1, 0x12);
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cr_assert_eq(mos6502_resolve_abs(cpu), 111);
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}
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Test(mos6502_addr, addr_mode_abx_carry0)
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{
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vm_segment_set(cpu->memory, 0x1234, 111);
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SET_PC_BYTE(cpu, 0, 0x12);
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SET_PC_BYTE(cpu, 1, 0x30);
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SET_PC_BYTE(cpu, 0, 0x30);
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SET_PC_BYTE(cpu, 1, 0x12);
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cpu->X = 4;
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cr_assert_eq(mos6502_resolve_abx(cpu), 111);
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}
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@ -39,8 +39,8 @@ Test(mos6502_addr, addr_mode_abx_carry0)
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Test(mos6502_addr, addr_mode_abx_carry1)
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{
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vm_segment_set(cpu->memory, 0x1234, 111);
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SET_PC_BYTE(cpu, 0, 0x12);
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SET_PC_BYTE(cpu, 1, 0x30);
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SET_PC_BYTE(cpu, 0, 0x30);
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SET_PC_BYTE(cpu, 1, 0x12);
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cpu->X = 3;
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cpu->P = cpu->P | MOS_CARRY;
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cr_assert_eq(mos6502_resolve_abx(cpu), 111);
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@ -49,8 +49,8 @@ Test(mos6502_addr, addr_mode_abx_carry1)
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Test(mos6502_addr, addr_mode_aby_carry0)
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{
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vm_segment_set(cpu->memory, 0x1234, 111);
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SET_PC_BYTE(cpu, 0, 0x12);
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SET_PC_BYTE(cpu, 1, 0x30);
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SET_PC_BYTE(cpu, 0, 0x30);
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SET_PC_BYTE(cpu, 1, 0x12);
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cpu->Y = 4;
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cr_assert_eq(mos6502_resolve_aby(cpu), 111);
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}
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@ -58,8 +58,8 @@ Test(mos6502_addr, addr_mode_aby_carry0)
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Test(mos6502_addr, addr_mode_aby_carry1)
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{
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vm_segment_set(cpu->memory, 0x1234, 111);
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SET_PC_BYTE(cpu, 0, 0x12);
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SET_PC_BYTE(cpu, 1, 0x30);
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SET_PC_BYTE(cpu, 0, 0x30);
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SET_PC_BYTE(cpu, 1, 0x12);
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cpu->Y = 3;
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cpu->P = cpu->P | MOS_CARRY;
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cr_assert_eq(mos6502_resolve_aby(cpu), 111);
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@ -93,12 +93,12 @@ Test(mos6502_addr, addr_mode_idy)
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Test(mos6502_addr, addr_mode_ind)
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{
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vm_segment_set(cpu->memory, 0x1234, 0x23);
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vm_segment_set(cpu->memory, 0x1235, 0x45);
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vm_segment_set(cpu->memory, 0x1234, 0x45);
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vm_segment_set(cpu->memory, 0x1235, 0x23);
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vm_segment_set(cpu->memory, 0x2345, 123);
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SET_PC_BYTE(cpu, 0, 0x12);
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SET_PC_BYTE(cpu, 1, 0x34);
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SET_PC_BYTE(cpu, 0, 0x34);
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SET_PC_BYTE(cpu, 1, 0x12);
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cr_assert_eq(mos6502_resolve_ind(cpu), 123);
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}
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@ -169,8 +169,8 @@ Test(vm_segment, set_map_machine)
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Test(vm_segment, get16)
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{
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vm_segment_set(segment, 0, 0x12);
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vm_segment_set(segment, 1, 0x34);
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vm_segment_set(segment, 0, 0x34);
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vm_segment_set(segment, 1, 0x12);
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cr_assert_eq(vm_segment_get16(segment, 0), 0x1234);
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}
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