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make_master_rom.c
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#include <assert.h>
#include <fcntl.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include "defs_6502.h"
#include "emit_6502.h"
#include "test_helper.h"
#include "util.h"
static const size_t k_rom_size = 16384;
static void
set_new_index(struct util_buffer* p_buf, size_t new_index) {
size_t curr_index = util_buffer_get_pos(p_buf);
assert(new_index >= curr_index);
util_buffer_set_pos(p_buf, new_index);
}
int
main(int argc, const char* argv[]) {
int fd;
ssize_t write_ret;
uint8_t* p_mem = malloc(k_rom_size);
struct util_buffer* p_buf = util_buffer_create();
(void) argc;
(void) argv;
(void) memset(p_mem, '\xF2', k_rom_size);
util_buffer_setup(p_buf, p_mem, k_rom_size);
/* NMI vector, @0xFF80 */
p_mem[0x3FFA] = 0x80;
p_mem[0x3FFB] = 0xFF;
/* Reset vector: jump to 0xC000, start of OS ROM. */
p_mem[0x3FFC] = 0x00;
p_mem[0x3FFD] = 0xC0;
/* IRQ vector, @0xFF00 */
p_mem[0x3FFE] = 0x00;
p_mem[0x3FFF] = 0xFF;
/* Check ROMSEL / RAMSEL readability and initial state. */
set_new_index(p_buf, 0x0000);
emit_LDA(p_buf, k_abs, 0xFE30);
emit_REQUIRE_EQ(p_buf, 0);
emit_LDA(p_buf, k_abs, 0xFE34);
emit_REQUIRE_EQ(p_buf, 0);
emit_LDA(p_buf, k_imm, 0x01);
emit_STA(p_buf, k_abs, 0xFE30);
emit_STA(p_buf, k_abs, 0xFE34);
emit_LDA(p_buf, k_abs, 0xFE30);
emit_REQUIRE_EQ(p_buf, 1);
emit_LDA(p_buf, k_abs, 0xFE34);
emit_REQUIRE_EQ(p_buf, 1);
/* Check HAZEL paging. */
emit_JSR(p_buf, 0xE000);
emit_JMP(p_buf, k_abs, 0xC040);
/* Check LYNNE paging. */
set_new_index(p_buf, 0x0040);
emit_JSR(p_buf, 0xE300);
emit_JMP(p_buf, k_abs, 0xC080);
/* Test write of ROM via page wrap to 0x8000. */
set_new_index(p_buf, 0x0080);
emit_LDA(p_buf, k_imm, 0x0F);
emit_STA(p_buf, k_abs, 0xFE30);
emit_LDA(p_buf, k_abs, 0x8000);
emit_STA(p_buf, k_abs, 0x1000);
/* Set up pointer to $7FFF in zero page. */
emit_LDA(p_buf, k_imm, 0xFF);
emit_STA(p_buf, k_zpg, 0xF0);
emit_LDA(p_buf, k_imm, 0x7F);
emit_STA(p_buf, k_zpg, 0xF1);
emit_LDA(p_buf, k_imm, 0xBB);
/* Write to $7FFF + 1 */
emit_LDY(p_buf, k_imm, 0x01);
emit_STA(p_buf, k_idy, 0xF0);
emit_LDA(p_buf, k_abs, 0x8000);
emit_CMP(p_buf, k_abs, 0x1000);
emit_REQUIRE_ZF(p_buf, 1);
emit_JMP(p_buf, k_abs, 0xC0C0);
/* Test fixed behavior of JMP (ind) page crossing on 65c12. */
set_new_index(p_buf, 0x00C0);
emit_LDA(p_buf, k_imm, 0x00);
emit_STA(p_buf, k_abs, 0x10FF);
emit_LDA(p_buf, k_imm, 0xE1);
emit_STA(p_buf, k_abs, 0x1000);
emit_LDA(p_buf, k_imm, 0xC1);
emit_STA(p_buf, k_abs, 0x1100);
emit_JMP(p_buf, k_ind, 0x10FF);
/* Test 65c12 behavior of clearing the D flag on BRK / IRQ. */
set_new_index(p_buf, 0x0100);
emit_SED(p_buf);
emit_BRK(p_buf);
emit_NOP(p_buf);
emit_CLD(p_buf);
emit_JMP(p_buf, k_abs, 0xC140);
/* Test CMOS read.
* This sequence used to prod the CMOS is the same as the terminal ROM in
* MOS3.20, specifically at $8E76.
*/
set_new_index(p_buf, 0x0140);
emit_LDA(p_buf, k_imm, 0x00);
emit_STA(p_buf, k_abs, 0xFE40);
/* Standard MOS3.20 DDRB value. */
emit_LDA(p_buf, k_imm, 0xCF);
emit_STA(p_buf, k_abs, 0xFE42);
/* Keyboard to column mode. */
emit_LDA(p_buf, k_imm, 0x03);
emit_STA(p_buf, k_abs, 0xFE40);
/* Begin $8E76 sequence, to read CMOS $18. */
emit_LDX(p_buf, k_imm, 0x18);
/* Data select low, then address select high. */
emit_LDA(p_buf, k_imm, 0x02);
emit_STA(p_buf, k_abs, 0xFE40);
emit_LDA(p_buf, k_imm, 0x82);
emit_STA(p_buf, k_abs, 0xFE40);
/* DDRA to output, and set CMOS address. */
emit_LDA(p_buf, k_imm, 0xFF);
emit_STA(p_buf, k_abs, 0xFE43);
emit_STX(p_buf, k_abs, 0xFE4F);
/* CMOS enable, address select still high. */
emit_LDA(p_buf, k_imm, 0xC2);
emit_STA(p_buf, k_abs, 0xFE40);
/* CMOS enable, address select low -> latch address. */
emit_LDA(p_buf, k_imm, 0x42);
emit_STA(p_buf, k_abs, 0xFE40);
/* CMOS enable, read high. */
emit_LDA(p_buf, k_imm, 0x49);
emit_STA(p_buf, k_abs, 0xFE40);
/* DDRA to input. */
emit_LDA(p_buf, k_imm, 0x00);
emit_STA(p_buf, k_abs, 0xFE43);
/* CMOS enable, data select high. */
emit_LDA(p_buf, k_imm, 0x4A);
emit_STA(p_buf, k_abs, 0xFE40);
/* Read it!! */
emit_LDY(p_buf, k_abs, 0xFE4F);
emit_TYA(p_buf);
emit_REQUIRE_EQ(p_buf, 0x17);
/* Check it's still ok with keyboard in autoscan mode. */
emit_LDA(p_buf, k_imm, 0x4B);
emit_STA(p_buf, k_abs, 0xFE40);
emit_LDY(p_buf, k_abs, 0xFE4F);
emit_TYA(p_buf);
emit_REQUIRE_EQ(p_buf, 0x17);
/* CMOS enable, data select low. */
emit_LDA(p_buf, k_imm, 0x42);
emit_STA(p_buf, k_abs, 0xFE40);
/* CMOS disable. */
emit_LDA(p_buf, k_imm, 0x02);
emit_STA(p_buf, k_abs, 0xFE40);
emit_JMP(p_buf, k_abs, 0xC1C0);
/* Check instruction timings that are different on 65c12. */
set_new_index(p_buf, 0x01C0);
emit_CYCLES_RESET(p_buf);
emit_NOP1(p_buf);
emit_CYCLES(p_buf);
emit_REQUIRE_EQ(p_buf, 9);
emit_LDA(p_buf, k_imm, 0x00);
emit_STA(p_buf, k_abs, 0x1000);
emit_LDA(p_buf, k_imm, 0xC2);
emit_STA(p_buf, k_abs, 0x1001);
emit_CYCLES_RESET(p_buf);
emit_JMP(p_buf, k_ind, 0x1000);
/* ROR, ROL, LSR, ASL abx all take 6 cycles if no page crossing on 65c12. */
set_new_index(p_buf, 0x0200);
emit_CYCLES(p_buf);
emit_REQUIRE_EQ(p_buf, 14);
emit_LDX(p_buf, k_imm, 0xFF);
emit_CYCLES_RESET(p_buf);
emit_ROR(p_buf, k_abx, 0x1000);
emit_CYCLES(p_buf);
emit_REQUIRE_EQ(p_buf, 14);
emit_CYCLES_RESET(p_buf);
emit_ROR(p_buf, k_abx, 0x1001);
emit_CYCLES(p_buf);
emit_REQUIRE_EQ(p_buf, 15);
emit_CYCLES_RESET(p_buf);
emit_INC(p_buf, k_abx, 0x1000);
emit_CYCLES(p_buf);
emit_REQUIRE_EQ(p_buf, 15);
emit_JMP(p_buf, k_abs, 0xC250);
/* Check floppy cycle stretch region timing, which differs on the Master. */
set_new_index(p_buf, 0x0250);
emit_LDA(p_buf, k_imm, 0x00);
emit_CYCLES_RESET(p_buf);
emit_STA(p_buf, k_abs, 0xFE24);
emit_CYCLES(p_buf);
emit_REQUIRE_EQ(p_buf, 12);
emit_LDX(p_buf, k_abs, 0xFE00);
emit_CYCLES_RESET(p_buf);
emit_STA(p_buf, k_abs, 0xFE29);
emit_CYCLES(p_buf);
emit_REQUIRE_EQ(p_buf, 14);
emit_JMP(p_buf, k_abs, 0xC280);
/* Check MOS VDU access to LYNNE (shadow RAM) or main. */
set_new_index(p_buf, 0x0280);
emit_LDA(p_buf, k_imm, 0x00);
emit_STA(p_buf, k_abs, 0xFE34);
emit_LDA(p_buf, k_imm, 0x55);
emit_STA(p_buf, k_abs, 0x4000);
emit_LDA(p_buf, k_imm, 0x06);
emit_STA(p_buf, k_abs, 0xFE34);
emit_LDA(p_buf, k_imm, 0xAA);
emit_STA(p_buf, k_abs, 0x4000);
/* Set ACCCON E bit and access LYNNE because PC=0xCxxx. */
emit_LDA(p_buf, k_imm, 0x02);
emit_STA(p_buf, k_abs, 0xFE34);
emit_LDA(p_buf, k_imm, 0xFB);
emit_STA(p_buf, k_abs, 0x4000);
emit_LDA(p_buf, k_abs, 0x4000);
emit_REQUIRE_EQ(p_buf, 0xFB);
emit_LDA(p_buf, k_imm, 0x06);
emit_STA(p_buf, k_abs, 0xFE34);
emit_LDA(p_buf, k_abs, 0x4000);
emit_REQUIRE_EQ(p_buf, 0xFB);
emit_LDA(p_buf, k_imm, 0x00);
emit_STA(p_buf, k_abs, 0xFE34);
emit_LDA(p_buf, k_abs, 0x4000);
emit_REQUIRE_EQ(p_buf, 0x55);
emit_JSR(p_buf, 0xE200);
emit_JMP(p_buf, k_abs, 0xC300);
/* Check MOS VDU access to main, perhaps the most surpring combination. */
set_new_index(p_buf, 0x0300);
emit_LDA(p_buf, k_imm, 0x00);
emit_STA(p_buf, k_abs, 0xFE34);
emit_LDA(p_buf, k_imm, 0x07);
emit_STA(p_buf, k_abs, 0x4000);
emit_LDA(p_buf, k_imm, 0x02);
emit_STA(p_buf, k_abs, 0xFE34);
emit_LDA(p_buf, k_imm, 0x08);
emit_STA(p_buf, k_abs, 0x4000);
emit_LDA(p_buf, k_imm, 0x04);
emit_STA(p_buf, k_abs, 0xFE34);
emit_LDA(p_buf, k_abs, 0x4000);
emit_REQUIRE_EQ(p_buf, 0x07);
emit_LDA(p_buf, k_imm, 0x00);
emit_STA(p_buf, k_abs, 0xFE34);
emit_JMP(p_buf, k_abs, 0xC340);
/* Test ROM reads / writes above the registers. */
set_new_index(p_buf, 0x0340);
emit_LDA(p_buf, k_imm, 0x00);
emit_STA(p_buf, k_abs, 0xFFFF);
emit_LDA(p_buf, k_abs, 0xFFFF);
emit_REQUIRE_EQ(p_buf, 0xFF);
emit_JMP(p_buf, k_abs, 0xC380);
/* Test for an assert that hit with Stryker's Run. */
set_new_index(p_buf, 0x0380);
emit_LDA(p_buf, k_imm, 0x00);
emit_STA(p_buf, k_abs, 0xFE34);
emit_LDX(p_buf, k_imm, 0x80);
emit_LDA(p_buf, k_abx, 0x7F80);
emit_STA(p_buf, k_zpg, 0xF0);
emit_LDA(p_buf, k_imm, 0x00);
/* This asserted due to page crossing. */
emit_STA(p_buf, k_abx, 0x7F80);
emit_LDA(p_buf, k_abs, 0x8000);
emit_CMP(p_buf, k_zpg, 0xF0);
emit_REQUIRE_ZF(p_buf, 1);
emit_JMP(p_buf, k_abs, 0xC3C0);
/* Test 65c12 BRK / NMI collision, both should run. */
set_new_index(p_buf, 0x03C0);
emit_STZ(p_buf, k_zpg, 0x10);
emit_STZ(p_buf, k_zpg, 0x11);
emit_LDX(p_buf, k_imm, 0x00);
emit_STA(p_buf, k_abs, 0xFEE3);
emit_BRK(p_buf);
emit_INX(p_buf);
emit_TXA(p_buf);
emit_REQUIRE_ZF(p_buf, 1);
emit_LDA(p_buf, k_zpg, 0x10);
emit_REQUIRE_ZF(p_buf, 0);
emit_LDA(p_buf, k_zpg, 0x11);
emit_REQUIRE_ZF(p_buf, 0);
emit_JMP(p_buf, k_abs, 0xC400);
/* Test 65c12 quirk where there's no IRQ poll on 1-byte NOPs. */
set_new_index(p_buf, 0x0400);
emit_STA(p_buf, k_abs, 0xFEE3);
emit_NOP1(p_buf);
emit_NOP1(p_buf);
emit_NOP1(p_buf);
emit_NOP1(p_buf);
emit_NOP(p_buf);
emit_LDA(p_buf, k_zpg, 0x12);
emit_REQUIRE_EQ(p_buf, 0x08);
emit_JMP(p_buf, k_abs, 0xC440);
/* Test BCD timing includes extra cycle. */
set_new_index(p_buf, 0x0440);
emit_SED(p_buf);
emit_CYCLES_RESET(p_buf);
emit_ADC(p_buf, k_zpg, 0x00);
emit_CYCLES(p_buf);
emit_CLD(p_buf);
emit_REQUIRE_EQ(p_buf, 12);
emit_JMP(p_buf, k_abs, 0xC480);
/* Test that abs RMW instructions do read-read-write. */
set_new_index(p_buf, 0x0480);
emit_SEI(p_buf);
emit_STZ(p_buf, k_abs, 0xFE68);
emit_LDA(p_buf, k_imm, 0x01);
emit_STA(p_buf, k_abs, 0xFE69);
emit_LDA(p_buf, k_imm, 0x7F);
emit_STA(p_buf, k_abs, 0xFE6D);
emit_LDA(p_buf, k_imm, 0x01);
emit_STA(p_buf, k_abs, 0xFE68);
emit_STZ(p_buf, k_abs, 0xFE69);
emit_DEC(p_buf, k_abs, 0xFE68);
emit_LDA(p_buf, k_abs, 0xFE6D);
emit_AND(p_buf, k_imm, 0x20);
emit_REQUIRE_EQ(p_buf, 0);
emit_STZ(p_buf, k_abs, 0xFE69);
emit_LDA(p_buf, k_abs, 0xFE68);
emit_REQUIRE_EQ(p_buf, 0xFC);
emit_CLI(p_buf);
emit_JMP(p_buf, k_abs, 0xC4C0);
/* Test that abx RMW instructions do read-read-write. */
set_new_index(p_buf, 0x04C0);
emit_SEI(p_buf);
emit_LDX(p_buf, k_imm, 0x69);
emit_STZ(p_buf, k_abs, 0xFE68);
emit_LDA(p_buf, k_imm, 0x01);
emit_STA(p_buf, k_abs, 0xFE69);
emit_LDA(p_buf, k_imm, 0x7F);
emit_STA(p_buf, k_abs, 0xFE6D);
emit_LDA(p_buf, k_imm, 0x01);
emit_STA(p_buf, k_abs, 0xFE68);
emit_STZ(p_buf, k_abs, 0xFE69);
/* Hit $FE68 with page crossing. */
emit_DEC(p_buf, k_abx, 0xFDFF);
emit_LDA(p_buf, k_abs, 0xFE6D);
emit_AND(p_buf, k_imm, 0x20);
emit_REQUIRE_EQ(p_buf, 0);
emit_STZ(p_buf, k_abs, 0xFE69);
emit_LDA(p_buf, k_abs, 0xFE68);
emit_REQUIRE_EQ(p_buf, 0xFC);
emit_CLI(p_buf);
emit_JMP(p_buf, k_abs, 0xC500);
/* Test that abx RMW instructions do read-read-write. */
set_new_index(p_buf, 0x0500);
emit_SEI(p_buf);
emit_LDX(p_buf, k_imm, 0x00);
emit_STZ(p_buf, k_abs, 0xFE68);
emit_LDA(p_buf, k_imm, 0x01);
emit_STA(p_buf, k_abs, 0xFE69);
emit_LDA(p_buf, k_imm, 0x7F);
emit_STA(p_buf, k_abs, 0xFE6D);
emit_LDA(p_buf, k_imm, 0x01);
emit_STA(p_buf, k_abs, 0xFE68);
emit_STZ(p_buf, k_abs, 0xFE69);
/* Hit $FE68 without page crossing -- causes 65c12 spurious read. */
emit_DEC(p_buf, k_abx, 0xFE68);
emit_LDA(p_buf, k_abs, 0xFE6D);
emit_AND(p_buf, k_imm, 0x20);
emit_REQUIRE_EQ(p_buf, 0);
emit_STZ(p_buf, k_abs, 0xFE69);
emit_LDA(p_buf, k_abs, 0xFE68);
emit_REQUIRE_EQ(p_buf, 0xFB);
emit_CLI(p_buf);
emit_JMP(p_buf, k_abs, 0xC540);
/* Exit sequence. */
set_new_index(p_buf, 0x0540);
emit_EXIT(p_buf);
/* Host this at $E000 so we can page HAZEL without corrupting our own code. */
set_new_index(p_buf, 0x2000);
emit_LDA(p_buf, k_abs, 0xC000);
emit_STA(p_buf, k_abs, 0x1000);
emit_LDA(p_buf, k_imm, 0xFF);
emit_STA(p_buf, k_abs, 0xC000);
emit_LDA(p_buf, k_abs, 0xC000);
emit_CMP(p_buf, k_abs, 0x1000);
emit_REQUIRE_ZF(p_buf, 1);
/* Page in HAZEL. */
emit_LDA(p_buf, k_imm, 0x08);
emit_STA(p_buf, k_abs, 0xFE34);
emit_LDA(p_buf, k_imm, 0xFF);
emit_STA(p_buf, k_abs, 0xC000);
emit_LDA(p_buf, k_abs, 0xC000);
emit_REQUIRE_EQ(p_buf, 0xFF);
/* Page out HAZEL. */
emit_LDA(p_buf, k_imm, 0x00);
emit_STA(p_buf, k_abs, 0xFE34);
emit_LDA(p_buf, k_abs, 0xC000);
emit_CMP(p_buf, k_abs, 0x1000);
emit_REQUIRE_ZF(p_buf, 1);
/* In again. */
emit_LDA(p_buf, k_imm, 0x08);
emit_STA(p_buf, k_abs, 0xFE34);
emit_LDA(p_buf, k_abs, 0xC000);
emit_REQUIRE_EQ(p_buf, 0xFF);
/* Out again. */
emit_LDA(p_buf, k_imm, 0x00);
emit_STA(p_buf, k_abs, 0xFE34);
emit_RTS(p_buf);
/* Host a crash gadget at 0xE100. */
set_new_index(p_buf, 0x2100);
emit_CRASH(p_buf);
/* More code that needs to be here because it pages in HAZEL. */
set_new_index(p_buf, 0x2200);
/* Bit E with HAZEL paged in and LYNNE paged out. */
emit_LDA(p_buf, k_imm, 0x0A);
emit_STA(p_buf, k_abs, 0xFE34);
emit_LDA(p_buf, k_abs, 0x4000);
emit_REQUIRE_EQ(p_buf, 0x55);
emit_LDA(p_buf, k_imm, 0x97);
emit_STA(p_buf, k_abs, 0x4000);
/* Bit E with HAZEL paged in and LYNNE paged in. */
emit_LDA(p_buf, k_imm, 0x0E);
emit_STA(p_buf, k_abs, 0xFE34);
emit_LDA(p_buf, k_abs, 0x4000);
emit_REQUIRE_EQ(p_buf, 0xFB);
emit_LDA(p_buf, k_imm, 0x00);
emit_STA(p_buf, k_abs, 0xFE34);
emit_LDA(p_buf, k_abs, 0x4000);
emit_REQUIRE_EQ(p_buf, 0x97);
emit_RTS(p_buf);
/* This needs to be here to avoid triggering MOS VDU access. */
set_new_index(p_buf, 0x2300);
emit_LDA(p_buf, k_imm, 0x00);
emit_STA(p_buf, k_abs, 0xFE34);
emit_LDA(p_buf, k_imm, 0x41);
emit_STA(p_buf, k_abs, 0x3000);
/* Page in LYNNE. */
emit_LDA(p_buf, k_imm, 0x04);
emit_STA(p_buf, k_abs, 0xFE34);
emit_LDA(p_buf, k_imm, 0x42);
emit_STA(p_buf, k_abs, 0x3000);
/* Out again. */
emit_LDA(p_buf, k_imm, 0x00);
emit_STA(p_buf, k_abs, 0xFE34);
emit_LDA(p_buf, k_abs, 0x3000);
emit_REQUIRE_EQ(p_buf, 0x41);
/* In again. */
emit_LDA(p_buf, k_imm, 0x04);
emit_STA(p_buf, k_abs, 0xFE34);
emit_LDA(p_buf, k_abs, 0x3000);
emit_REQUIRE_EQ(p_buf, 0x42);
emit_LDA(p_buf, k_imm, 0x00);
emit_STA(p_buf, k_abs, 0xFE34);
emit_RTS(p_buf);
/* IRQ handler at 0xFF00. */
set_new_index(p_buf, 0x3F00);
emit_PHP(p_buf);
emit_PLA(p_buf);
emit_AND(p_buf, k_imm, 0x08);
emit_REQUIRE_ZF(p_buf, 1);
emit_INC(p_buf, k_zpg, 0x10);
emit_RTI(p_buf);
/* NMI handler at 0xFF80. */
set_new_index(p_buf, 0x3F80);
emit_INC(p_buf, k_zpg, 0x11);
emit_PHA(p_buf);
emit_PHX(p_buf);
emit_TSX(p_buf);
emit_INX(p_buf);
emit_INX(p_buf);
emit_INX(p_buf);
emit_INX(p_buf);
emit_LDA(p_buf, k_abx, 0x0100);
emit_STA(p_buf, k_zpg, 0x12);
emit_PLX(p_buf);
emit_PLA(p_buf);
emit_RTI(p_buf);
fd = open("master.rom", O_CREAT | O_WRONLY, 0600);
if (fd < 0) {
util_bail("can't open output rom");
}
write_ret = write(fd, p_mem, k_rom_size);
if (write_ret < 0) {
util_bail("can't write output rom");
}
if ((size_t) write_ret != k_rom_size) {
util_bail("can't write output rom");
}
if (close(fd) != 0) {
util_bail("can't close output file descriptor for rom");
}
util_buffer_destroy(p_buf);
free(p_mem);
return 0;
}