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But weird forms. In most cases they basically are NOPs, except with different opcodes. In other cases, we call them NP2 and NP3s, and do so because they consume 2 or 3 bytes respectively (vs. just 1 with NOP). We had to teach some arcane magic to the emulator for this to work. We may want to refactor to decouple the number of bytes consumed from the address mode.
78 lines
1.6 KiB
C
78 lines
1.6 KiB
C
#include <criterion/criterion.h>
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#include "mos6502.h"
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#include "mos6502.enums.h"
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#include "mos6502.tests.h"
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TestSuite(mos6502_exec, .init = setup, .fini = teardown);
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Test(mos6502_exec, brk)
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{
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// Start out with the decimal bit high so we can test it gets turned
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// off; this assignment also guarantees the I bit is low, and that
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// should be set high by the handler as well.
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cpu->P = MOS_DECIMAL;
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vm_8bit orig_P = cpu->P;
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cpu->PC = 123;
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mos6502_handle_brk(cpu, 0);
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cr_assert_eq(cpu->PC, 125);
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cr_assert_eq(cpu->P & MOS_INTERRUPT, MOS_INTERRUPT);
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cr_assert_eq(cpu->P & MOS_DECIMAL, 0);
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cr_assert_eq(mos6502_pop_stack(cpu), orig_P);
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cr_assert_eq(mos6502_pop_stack(cpu), 123);
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}
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Test(mos6502_exec, jmp)
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{
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cpu->PC = 123;
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cpu->eff_addr = 234;
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mos6502_handle_jmp(cpu, 0);
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cr_assert_eq(cpu->PC, 234);
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}
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Test(mos6502_exec, jsr)
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{
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cpu->PC = 123;
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cpu->eff_addr = 235;
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mos6502_handle_jsr(cpu, 0);
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cr_assert_eq(cpu->PC, 235);
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cr_assert_eq(mos6502_pop_stack(cpu), 125);
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}
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/*
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* In addition to nop, we also have np2 and np3 which also do nothing.
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* We're just passing on those.
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*
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* Test(mos6502_exec, np2)
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* Test(mos6502_exec, np3)
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*/
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Test(mos6502_exec, nop)
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{
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// currently this test does nothing -- we _should_ test to see if we
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// pass the right number of cycles, though.
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}
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Test(mos6502_exec, rti)
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{
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mos6502_push_stack(cpu, 222);
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mos6502_push_stack(cpu, cpu->P);
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mos6502_handle_rti(cpu, 0);
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cr_assert_eq(cpu->PC, 222);
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}
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Test(mos6502_exec, rts)
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{
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mos6502_push_stack(cpu, 233);
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mos6502_handle_rts(cpu, 0);
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cr_assert_eq(cpu->PC, 234);
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}
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