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82 lines
2.1 KiB
82 lines
2.1 KiB
#include "boot.h"
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#include "cpu.h"
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#include "insn.h"
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#include "psx.h"
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#include <assert.h>
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#include <stdlib.h>
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#include <stdio.h>
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#include <string.h>
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static const uint8_t MAGIC[0x10] = "PS-X EXE";
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static const uint8_t RESERVED[0x10] = {0};
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psx_header_t parse_psx_header(byte_arr_t *prgm)
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{
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psx_header_t header;
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// TODO: Convert asserts into recoverable error
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assert(sizeof header == 0x38 - 0x10);
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assert(prgm->size >= 0x800);
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assert(memcmp(MAGIC, prgm->data, sizeof MAGIC) == 0);
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memcpy(&header, &prgm->data[sizeof MAGIC], sizeof header);
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assert(header.size_file == prgm->size - 0x800);
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assert(memcmp(RESERVED, &prgm->data[0x38], sizeof RESERVED) == 0);
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return header;
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}
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uint32_t translate_addr(uint32_t addr)
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{
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if (addr >= 0xA0000000)
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{
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addr = addr - 0xA0000000;
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}
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else if (addr >= 0x80000000)
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{
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addr = addr - 0x80000000;
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}
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return addr;
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}
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void boot_psx_prgm(byte_arr_t *prgm)
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{
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printf("parsing program header\n");
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psx_header_t header = parse_psx_header(prgm);
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printf("=== header ===\n");
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printf("pc = %08x, gp = %08x\n", header.pc, header.gp);
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printf("sp = %08x, fp = %08x\n", header.sp, header.fp);
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printf("data = %08x (%u bytes)\n", header.addr_data, header.size_data);
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printf("bss = %08x (%u bytes)\n", header.addr_bss, header.size_bss);
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printf("dest = %08x\n", header.addr_dest);
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printf("size = %08x (%u bytes)\n", header.size_file, header.size_file);
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cpu_t *cpu = malloc(sizeof *cpu);
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uint32_t start = translate_addr(header.addr_dest);
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assert(start + header.size_file < MAIN_RAM_SIZE);
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memcpy(&cpu->main_ram[start], &prgm->data[0x800], header.size_file);
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cpu->pc = header.pc;
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cpu->regs[REG_GP] = header.gp;
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cpu->regs[REG_SP] = header.sp;
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cpu->regs[REG_FP] = header.fp;
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psx_t psx = {header, cpu};
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const int max_insns = 1;
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for (int i = 0; i < max_insns; i++)
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{
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printf("=== insn ===\n");
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printf("pc = %08x\n", psx.cpu->pc);
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const uint32_t insn = cpu_read32(cpu, psx.cpu->pc);
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insn_execute(cpu, insn);
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psx.cpu->pc += 1;
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}
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}
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