a8e573c84a
Big one. This allows us to write higher order words directly in Forth, which is much more convenient than writing post-immediate (see "NOT" structure in diff if you want to see what I mean) structures in ASM. These structures can then be written to ROM (rather than loaded in RAM for definitions loaded at run-time). That's quite a bit of tooling that was added, 2 compilations stages, but I think it's well worth it.
83 lines
1.8 KiB
C
83 lines
1.8 KiB
C
#include <stdint.h>
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#include <stdio.h>
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#include <unistd.h>
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#include <termios.h>
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#include "../emul.h"
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#include "forth1-bin.h"
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// in sync with glue.asm
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#define RAMSTART 0x900
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#define STDIO_PORT 0x00
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static int running;
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static FILE *fp;
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static uint8_t iord_stdio()
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{
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int c = getc(fp);
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if (c == EOF) {
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running = 0;
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}
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return (uint8_t)c;
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}
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static void iowr_stdio(uint8_t val)
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{
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if (val == 0x04) { // CTRL+D
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running = 0;
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} else {
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putchar(val);
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}
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}
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int main(int argc, char *argv[])
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{
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bool tty = false;
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struct termios termInfo;
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if (argc == 2) {
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fp = fopen(argv[1], "r");
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if (fp == NULL) {
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fprintf(stderr, "Can't open %s\n", argv[1]);
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return 1;
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}
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} else if (argc == 1) {
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fp = stdin;
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tty = isatty(fileno(stdin));
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if (tty) {
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// Turn echo off: the shell takes care of its own echoing.
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if (tcgetattr(0, &termInfo) == -1) {
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printf("Can't setup terminal.\n");
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return 1;
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}
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termInfo.c_lflag &= ~ECHO;
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termInfo.c_lflag &= ~ICANON;
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tcsetattr(0, TCSAFLUSH, &termInfo);
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}
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} else {
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fprintf(stderr, "Usage: ./forth [filename]\n");
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return 1;
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}
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Machine *m = emul_init();
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m->ramstart = RAMSTART;
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m->iord[STDIO_PORT] = iord_stdio;
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m->iowr[STDIO_PORT] = iowr_stdio;
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// initialize memory
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for (int i=0; i<sizeof(KERNEL); i++) {
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m->mem[i] = KERNEL[i];
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}
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// Run!
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running = 1;
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while (running && emul_step());
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if (tty) {
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printf("\nDone!\n");
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termInfo.c_lflag |= ECHO;
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termInfo.c_lflag |= ICANON;
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tcsetattr(0, TCSAFLUSH, &termInfo);
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emul_printdebug();
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}
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fclose(fp);
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return 0;
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}
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