Mercurial > repos > blastem
view transz80.c @ 561:666adeba5a61
Save and restore guest address in the write function for a code memory chunk in the "slow" path for inconvenient host addresses. This fixes an intermittent crash on OSX in the code that checks whether the memory written may contain code
author | Mike Pavone <pavone@retrodev.com> |
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date | Mon, 23 Jun 2014 11:46:56 -0400 |
parents | b7b7a1cab44a |
children | 759c38bf97f8 |
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/* Copyright 2013 Michael Pavone This file is part of BlastEm. BlastEm is free software distributed under the terms of the GNU General Public License version 3 or greater. See COPYING for full license text. */ #include "z80inst.h" #include "z80_to_x86.h" #include "mem.h" #include "vdp.h" #include <stdio.h> #include <stdlib.h> uint8_t z80_ram[0x2000]; uint16_t cart[0x200000]; #define MCLKS_PER_Z80 15 //TODO: Figure out the exact value for this #define MCLKS_PER_FRAME (MCLKS_LINE*262) #define VINT_CYCLE ((MCLKS_LINE * 226)/MCLKS_PER_Z80) #define CYCLE_NEVER 0xFFFFFFFF uint8_t z80_read_ym(uint16_t location, z80_context * context) { return 0xFF; } z80_context * z80_write_ym(uint16_t location, z80_context * context, uint8_t value) { return context; } z80_context * z80_vdp_port_write(uint16_t location, z80_context * context, uint8_t value) { return context; } int main(int argc, char ** argv) { long filesize; uint8_t *filebuf; x86_z80_options opts; z80_context context; if (argc < 2) { fputs("usage: transz80 zrom [cartrom]\n", stderr); exit(1); } FILE * f = fopen(argv[1], "rb"); if (!f) { fprintf(stderr, "unable to open file %s\n", argv[2]); exit(1); } fseek(f, 0, SEEK_END); filesize = ftell(f); fseek(f, 0, SEEK_SET); fread(z80_ram, 1, filesize < sizeof(z80_ram) ? filesize : sizeof(z80_ram), f); fclose(f); if (argc > 2) { f = fopen(argv[2], "rb"); if (!f) { fprintf(stderr, "unable to open file %s\n", argv[2]); exit(1); } fseek(f, 0, SEEK_END); filesize = ftell(f); fseek(f, 0, SEEK_SET); fread(cart, 1, filesize < sizeof(cart) ? filesize : sizeof(cart), f); fclose(f); for(unsigned short * cur = cart; cur - cart < (filesize/2); ++cur) { *cur = (*cur >> 8) | (*cur << 8); } } init_x86_z80_opts(&opts); init_z80_context(&context, &opts); //Z80 RAM context.mem_pointers[0] = z80_ram; context.sync_cycle = context.target_cycle = MCLKS_PER_FRAME/MCLKS_PER_Z80; context.int_cycle = CYCLE_NEVER; //cartridge/bank context.mem_pointers[1] = context.mem_pointers[2] = (uint8_t *)cart; z80_reset(&context); for(;;) { z80_run(&context); if (context.current_cycle >= MCLKS_PER_FRAME/MCLKS_PER_Z80) { context.current_cycle -= MCLKS_PER_FRAME/MCLKS_PER_Z80; } if (context.current_cycle < VINT_CYCLE && context.iff1) { context.int_cycle = VINT_CYCLE; } context.target_cycle = context.sync_cycle < context.int_cycle ? context.sync_cycle : context.int_cycle; } return 0; }