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277 lines
7.4 KiB
C
277 lines
7.4 KiB
C
#include <criterion/criterion.h>
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#include <unistd.h>
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#include "mos6502.h"
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#include "mos6502.dis.h"
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#include "mos6502.enums.h"
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/*
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* BUFSIZ is the normal block-buffer size that a FILE stream would use
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* (possibly amongst other things).
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*/
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static char buf[BUFSIZ];
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/*
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* This is the file stream we will be using to write our disassembly
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* code into.
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*/
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static FILE *stream = NULL;
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static mos6502 *cpu = NULL;
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static vm_segment *mem = NULL;
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static void
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setup()
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{
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// Ok, so...there's some...trickery going on here. As you might
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// guess by the file path being /dev/null.
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stream = fopen("/dev/null", "w");
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if (stream == NULL) {
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perror("Could not open temporary file for mos6502 disassembly tests");
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}
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// The C standard library allows us to set an arbitrary buffer for a
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// file stream. It also allows us to fully buffer the file stream,
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// which means nothing is written to file until an fflush() or an
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// fclose() is called (or something else I can't think of). So we
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// can use the FILE abstraction to write our disassembly results
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// into, but use an underlying string buffer that we can easily
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// check with Criterion. Uh, unless we blow out the buffer size...
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// don't do that :D
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setvbuf(stream, buf, _IOFBF, 256);
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mem = vm_segment_create(MOS6502_MEMSIZE);
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cpu = mos6502_create(mem, mem);
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}
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static void
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teardown()
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{
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fclose(stream);
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mos6502_free(cpu);
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vm_segment_free(mem);
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}
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static void
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assert_buf(const char *str)
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{
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// This will set the cursor position in the file back to the start
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// of the file stream.
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rewind(stream);
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// Our actual assertion. The downside to doing it this way is that
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// when Criterion flags an assertion failure, it'll highlight _this_
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// line in the file, not in the test. It might be worth macroifying
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// this code.
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cr_assert_str_eq(buf, str);
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// We're not sure what previous tests may have run, and where NUL
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// characters were set therein, so to be safe we wipe out the full
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// contents of the test buffer after every test.
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memset(buf, 0, BUFSIZ);
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}
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TestSuite(mos6502_dis, .init = setup, .fini = teardown);
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Test(mos6502_dis, operand)
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{
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mos6502_dis_operand(cpu, stream, 0, ABS, 0x1234);
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assert_buf("$1234");
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mos6502_dis_operand(cpu, stream, 0, ABX, 0x1234);
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assert_buf("$1234,X");
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mos6502_dis_operand(cpu, stream, 0, ABY, 0x1234);
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assert_buf("$1234,Y");
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mos6502_dis_operand(cpu, stream, 0, IMM, 0x12);
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assert_buf("#$12");
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mos6502_set(cpu, 0x1234, 0x48);
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mos6502_set(cpu, 0x1235, 0x34);
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// For JMPs and JSRs (and BRKs), this should be a label and not a
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// literal value. So we need to test both the literal and
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// jump-labeled version.
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mos6502_dis_operand(cpu, stream, 0, IND, 0x1234);
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assert_buf("($1234)");
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mos6502_dis_jump_label(cpu, 0x1234, 0, IND);
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mos6502_dis_operand(cpu, stream, 0, IND, 0x1234);
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assert_buf("ADDR_3448");
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// Let's undo our label above...
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mos6502_dis_jump_unlabel(0x1234);
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mos6502_dis_operand(cpu, stream, 0, IDX, 0x12);
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assert_buf("($12,X)");
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mos6502_dis_operand(cpu, stream, 0, IDY, 0x34);
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assert_buf("($34),Y");
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mos6502_dis_operand(cpu, stream, 0, ZPG, 0x34);
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assert_buf("$34 ");
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mos6502_dis_operand(cpu, stream, 0, ZPX, 0x34);
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assert_buf("$34,X");
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mos6502_dis_operand(cpu, stream, 0, ZPY, 0x34);
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assert_buf("$34,Y");
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// These should both end up printing nothing
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mos6502_dis_operand(cpu, stream, 0, ACC, 0);
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assert_buf("");
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mos6502_dis_operand(cpu, stream, 0, IMP, 0);
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assert_buf("");
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// Test a forward jump (operand < 128)
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mos6502_dis_operand(cpu, stream, 500, REL, 52);
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assert_buf("ADDR_228");
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// Test a backward jump (operand >= 128)
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mos6502_dis_operand(cpu, stream, 500, REL, 152);
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assert_buf("ADDR_18c");
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}
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Test(mos6502_dis, instruction)
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{
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#define TEST_INST(x) \
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mos6502_dis_instruction(stream, x); \
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assert_buf(#x)
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TEST_INST(ADC);
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TEST_INST(AND);
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TEST_INST(ASL);
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TEST_INST(BCC);
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TEST_INST(BCS);
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TEST_INST(BEQ);
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TEST_INST(BIT);
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TEST_INST(BMI);
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TEST_INST(BNE);
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TEST_INST(BPL);
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TEST_INST(BRK);
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TEST_INST(BVC);
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TEST_INST(BVS);
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TEST_INST(CLC);
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TEST_INST(CLD);
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TEST_INST(CLI);
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TEST_INST(CLV);
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TEST_INST(CMP);
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TEST_INST(CPX);
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TEST_INST(CPY);
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TEST_INST(DEC);
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TEST_INST(DEX);
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TEST_INST(DEY);
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TEST_INST(EOR);
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TEST_INST(INC);
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TEST_INST(INX);
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TEST_INST(INY);
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TEST_INST(JMP);
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TEST_INST(JSR);
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TEST_INST(LDA);
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TEST_INST(LDX);
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TEST_INST(LDY);
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TEST_INST(LSR);
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TEST_INST(NOP);
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TEST_INST(ORA);
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TEST_INST(PHA);
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TEST_INST(PHP);
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TEST_INST(PLA);
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TEST_INST(PLP);
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TEST_INST(ROL);
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TEST_INST(ROR);
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TEST_INST(RTI);
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TEST_INST(RTS);
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TEST_INST(SBC);
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TEST_INST(SEC);
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TEST_INST(SED);
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TEST_INST(SEI);
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TEST_INST(STA);
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TEST_INST(STX);
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TEST_INST(STY);
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TEST_INST(TAX);
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TEST_INST(TAY);
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TEST_INST(TSX);
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TEST_INST(TXA);
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TEST_INST(TXS);
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TEST_INST(TYA);
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}
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Test(mos6502_dis, expected_bytes)
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{
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#define TEST_BYTES(x, y) \
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cr_assert_eq(mos6502_dis_expected_bytes(x), y)
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TEST_BYTES(ACC, 0);
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TEST_BYTES(ABS, 2);
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TEST_BYTES(ABX, 2);
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TEST_BYTES(ABY, 2);
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TEST_BYTES(IMM, 1);
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TEST_BYTES(IMP, 0);
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TEST_BYTES(IND, 2);
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TEST_BYTES(IDX, 1);
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TEST_BYTES(IDY, 1);
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TEST_BYTES(REL, 1);
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TEST_BYTES(ZPG, 1);
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TEST_BYTES(ZPX, 1);
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TEST_BYTES(ZPY, 1);
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}
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Test(mos6502_dis, opcode)
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{
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int bytes;
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mos6502_set(cpu, 0, 0x29); // AND (imm)
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mos6502_set(cpu, 1, 0x38);
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bytes = mos6502_dis_opcode(cpu, stream, 0);
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assert_buf(" AND #$38 ; pc=$0000 cy=02: 29 38\n");
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cr_assert_eq(bytes, 2);
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}
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Test(mos6502_dis, scan)
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{
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mos6502_set(cpu, 0, 0x29); // AND (imm)
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mos6502_set(cpu, 1, 0x38);
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mos6502_set(cpu, 2, 0x88); // DEY (imp)
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mos6502_set(cpu, 3, 0x6C); // JMP (ind)
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mos6502_set(cpu, 4, 0x34);
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mos6502_set(cpu, 5, 0x12);
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mos6502_dis_scan(cpu, stream, 0, 6);
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// FIXME: scan does not currently advance the PC byte; _should_ it?
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// I'm honestly not sure. There are definitely times (e.g. during
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// runtime operation) when you don't want it to, but as a standalone
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// disassembler, it feels less useful when PC isn't emulated.
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assert_buf(" AND #$38 ; pc=$0000 cy=02: 29 38\n"
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" DEY ; pc=$0000 cy=02: 88\n"
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" JMP ($1234) ; pc=$0000 cy=05: 6c 34 12\n"
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);
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}
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/*
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* These tests are all contained within the jump_label test below.
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* Test(mos6502_dis, jump_unlabel)
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* Test(mos6502_dis, is_jump_label)
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*/
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Test(mos6502_dis, jump_label)
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{
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cr_assert_eq(mos6502_dis_is_jump_label(123), false);
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mos6502_set(cpu, 123, 5);
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mos6502_set(cpu, 124, 0);
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mos6502_dis_jump_label(cpu, 123, 0, IND);
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cr_assert_eq(mos6502_dis_is_jump_label(5), true);
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mos6502_dis_jump_unlabel(123);
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cr_assert_eq(mos6502_dis_is_jump_label(123), false);
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// Testing forward relative
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mos6502_dis_jump_label(cpu, 123, 10, REL);
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cr_assert_eq(mos6502_dis_is_jump_label(123 + 10), true);
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mos6502_dis_jump_unlabel(123 + 10);
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// Testing backward relative
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mos6502_dis_jump_label(cpu, 133, 1000, REL);
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cr_assert_eq(mos6502_dis_is_jump_label(133 + 1000 - 256), true);
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mos6502_dis_jump_unlabel(133 + 1000 - 256);
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}
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Test(mos6502_dis, label)
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{
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mos6502_dis_label(stream, 123);
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assert_buf("ADDR_7b");
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}
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