Initial commit

src/vm.c

@@ -0,0 +1,80 @@
+/* vm.c
+ *
+ *   Copyright (C) 2012,2014   Henrik Hautakoski <henrik.hautakoski@gmail.com>
+ *
+ *   This program is free software; you can redistribute it and/or modify
+ *   it under the terms of the GNU General Public License as published by
+ *   the Free Software Foundation; either version 2 of the License, or
+ *   (at your option) any later version.
+ *
+ *   This program is distributed in the hope that it will be useful,
+ *   but WITHOUT ANY WARRANTY; without even the implied warranty of
+ *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ *   GNU General Public License for more details.
+ *
+ *   You should have received a copy of the GNU General Public License
+ *   along with this program; if not, write to the Free Software
+ *   Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston,
+ *   MA 02110-1301, USA.
+ */
+#include <stdlib.h>
+#include <stdio.h>
+#include <string.h>
+#include <sys/types.h>
+#include <sys/stat.h>
+#include <fcntl.h>
+#include <errno.h>
+#include "cpu.h"
+
+// Load program from file
+unsigned long load_program(int fd, unsigned char **buf) {
+
+	struct stat st;
+	ssize_t rc;
+
+	if (fstat(fd, &st) < 0)
+		return -1;
+
+	*buf = malloc(st.st_size);
+	if (*buf == NULL)
+		return -1;
+
+	rc = read(fd, *buf, st.st_size);
+	if (rc < 0)
+		free(*buf);
+	return rc;
+}
+
+int main(int argc, char **argv) {
+
+	int fd;
+	unsigned char *instr_ptr;
+	unsigned instr_len;
+
+	if (argc < 2) {
+		fprintf(stderr, "usage: %s <file>\n", argv[0]);
+		return 1;
+	}
+
+	fd = open(argv[1], O_RDONLY);
+	if (fd < 0) {
+		fprintf(stderr, "Could not open file %s: %s\n",
+			argv[1], strerror(errno));
+		return 1;
+	}
+
+	instr_len = load_program(fd, &instr_ptr);
+	close(fd);
+
+	if (instr_len < 0)
+		return 1;
+
+	cpu_instr_load(instr_ptr, instr_len);
+
+	cpu_run();
+
+	if (instr_ptr)
+		free(instr_ptr);
+
+	return 0;
+}