147 lines
3.2 KiB
C
147 lines
3.2 KiB
C
/* Copyright (C) 2016 Jeremiah Orians
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* This file is part of stage0.
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*
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* stage0 is free software: you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation, either version 3 of the License, or
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* (at your option) any later version.
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*
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* stage0 is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with stage0. If not, see <http://www.gnu.org/licenses/>.
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*/
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#include "vm.h"
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#include <getopt.h>
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/* Load program tape into Memory */
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void load_program(struct lilith* vm, char* rom_name)
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{
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FILE* program;
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program = fopen(rom_name, "r");
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/* Figure out how much we need to load */
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fseek(program, 0, SEEK_END);
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size_t end = ftell(program);
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rewind(program);
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/* Deal with the special case of the ROM is bigger than available memory */
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if(end > vm->amount_of_Ram)
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{
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fprintf(stderr, "Program %s is %d bytes large but only %d bytes of memory have been allocated!\n", rom_name, (int)end, (int)vm->amount_of_Ram);
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exit(EXIT_FAILURE);
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}
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/* Load the entire tape into memory */
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fread(vm->memory, 1, end, program);
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fclose(program);
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}
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void execute_vm(struct lilith* vm)
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{
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struct Instruction* current;
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current = calloc(1, sizeof(struct Instruction));
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while(!vm->halted)
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{
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read_instruction(vm, current);
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eval_instruction(vm, current);
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}
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free(current);
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return;
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}
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/* Standard C main program */
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int main(int argc, char **argv)
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{
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int c;
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int Memory_Size = (16 * 1024);
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tape_01_name = "tape_01";
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tape_02_name = "tape_02";
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char* rom_name = NULL;
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char class;
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static struct option long_options[] = {
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{"rom", required_argument, 0, 'r'},
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{"tape_01", required_argument, 0, '1'},
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{"tape_02", required_argument, 0, '2'},
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{"memory", required_argument, 0, 'm'},
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{"help", no_argument, 0, 'h'},
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{0, 0, 0, 0}
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};
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int option_index = 0;
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while ((c = getopt_long(argc, argv, "r:h:1:2:m", long_options, &option_index)) != -1)
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{
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switch (c)
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{
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case 0: break;
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case 'r':
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{
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rom_name = optarg;
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break;
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}
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case 'h':
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{
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fprintf(stdout, "Usage: %s --rom $rom [--tape_01 $foo] [--tape_02 $bar]\n", argv[0]);
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exit(EXIT_SUCCESS);
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}
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case '1':
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{
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tape_01_name = optarg;
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break;
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}
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case '2':
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{
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tape_02_name = optarg;
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break;
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}
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case 'm':
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{
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int length = strlen(optarg) - 1;
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class = optarg[length];
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optarg[length] = 0;
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Memory_Size = atoi(optarg);
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if('K' == class)
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{
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Memory_Size = Memory_Size * 1024;
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}
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else if('M' == class)
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{
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Memory_Size = Memory_Size * 1024 * 1024;
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}
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else if('G' == class)
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{
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Memory_Size = Memory_Size * 1024 * 1024 * 1024;
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}
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break;
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}
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default:
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{
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exit(EXIT_FAILURE);
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}
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}
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}
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if(NULL == rom_name)
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{
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fprintf(stderr, "Usage: %s --rom $rom [--tape_01 $foo] [--tape_02 $bar]\n", argv[0]);
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exit(EXIT_FAILURE);
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}
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/* Perform all the essential stages in order */
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struct lilith* vm;
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vm = create_vm(Memory_Size);
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load_program(vm, rom_name);
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execute_vm(vm);
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destroy_vm(vm);
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return EXIT_SUCCESS;
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}
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