gb-emu: initial commit

Add a mostly non-functional Gameboy CPU and the skeleton
of a Gameboy assembler intended for unit tests.

src/tests/gbasm/fixed.c

@@ -0,0 +1,51 @@
+#include "tests/gbasm/test.h"
+#include "common.h"
+
+#define GEN_FIXED_TEST(_opcode, _hex)\
+	uint8_t _opcode##_output[] = _hex;	\
+	static const struct gbasm_test _opcode = { \
+		.name = #_opcode, \
+		.asm_source = #_opcode, \
+		.expected_output = _opcode##_output, \
+		.expected_output_len = sizeof(_opcode##_output), \
+	};
+
+GEN_FIXED_TEST(nop, {0x00})
+GEN_FIXED_TEST(halt, {0x76})
+GEN_FIXED_TEST(stop, {0x10})
+GEN_FIXED_TEST(di, {0xf3})
+GEN_FIXED_TEST(ei, {0xfb})
+GEN_FIXED_TEST(rla, {0x17})
+GEN_FIXED_TEST(rra, {0x1f})
+GEN_FIXED_TEST(rlca, {0x07})
+GEN_FIXED_TEST(rrca, {0x0f})
+GEN_FIXED_TEST(daa, {0x27})
+GEN_FIXED_TEST(scf, {0x37})
+GEN_FIXED_TEST(reti, {0xd9})
+GEN_FIXED_TEST(cpl, {0x2f})
+GEN_FIXED_TEST(ccf, {0x3f})
+
+static const struct gbasm_test *tests[] = {
+	&nop,
+	&halt,
+	&stop,
+	&di,
+	&ei,
+	&rla,
+	&rra,
+	&rrca,
+	&daa,
+	&scf,
+	&reti,
+	&cpl,
+	&ccf,
+};
+
+struct gbasm_tests gbasm_fixed_tests = {
+	.name = "fixed",
+	.num_tests = ARRAY_SIZE(tests),
+	.tests = tests,
+};
+
+
+

src/tests/gbasm/fixed.h

@@ -0,0 +1,9 @@
+#ifndef GBASM_TEST_FIXED_H
+#define GBASM_TEST_FIXED_H
+
+#include "tests/gbasm/test.h"
+#include "common.h"
+
+extern const struct gbasm_tests gbasm_fixed_tests;
+
+#endif

src/tests/gbasm/inc.c

@@ -0,0 +1,41 @@
+#include "tests/gbasm/test.h"
+#include "common.h"
+
+/* TODO: There is probably a better way to do this */
+static const char all_src[] =
+	"INC A\n"
+	"INC B\n"
+	"INC C\n"
+	"INC D\n"
+	"INC E\n"
+	"INC H\n"
+	"INC L\n"
+	"INC BC\n"
+	"INC DE\n"
+	"INC HL\n"
+	"INC SP\n"
+	"INC (HL)\n";
+
+static const uint8_t all_output[] = {
+	0x3c, 0x04, 0x0c, 0x14,
+	0x1c, 0x24, 0x2c, 0x03,
+	0x13, 0x23, 0x33, 0x34,
+};
+
+static const struct gbasm_test all = {
+	.name = "all",
+	.asm_source = all_src,
+	.expected_output = all_output,
+	.expected_output_len = sizeof(all_output),
+};
+
+static const struct gbasm_test *tests[] = {
+	&all,
+};
+
+struct gbasm_tests gbasm_inc_tests = {
+	.name = "inc",
+	.num_tests = ARRAY_SIZE(tests),
+	.tests = tests,
+};
+

src/tests/gbasm/inc.h

@@ -0,0 +1,9 @@
+#ifndef GBASM_TEST_INC_H
+#define GBASM_TEST_INC_H
+
+#include "tests/gbasm/test.h"
+#include "common.h"
+
+extern const struct gbasm_tests gbasm_inc_tests;
+
+#endif

src/tests/gbasm/test.h

@@ -0,0 +1,19 @@
+#ifndef GBASM_TEST_H
+#define GBASM_TEST_H
+
+#include <stdint.h>
+
+struct gbasm_test {
+	const char *name;
+	const char *asm_source;
+	const uint8_t *expected_output;
+	const int expected_output_len;
+};
+
+struct gbasm_tests {
+	const char *name;
+	int num_tests;
+	const struct gbasm_test **tests;
+};
+
+#endif