mirror of https://github.com/hsoft/collapseos.git
81 lines
2.0 KiB
C
81 lines
2.0 KiB
C
#include <stdint.h>
|
|
#include <stdio.h>
|
|
#include <unistd.h>
|
|
#include "emul.h"
|
|
|
|
/* Staging binaries
|
|
|
|
The role of a stage executable is to compile definitions in a dictionary and
|
|
then spit the difference between the starting binary and the new binary.
|
|
|
|
That binary can then be grafted to an exiting Forth binary to augment its
|
|
dictionary.
|
|
|
|
We could, if we wanted, run only with the bootstrap binary and compile core
|
|
defs at runtime, but that would mean that those defs live in RAM. In may system,
|
|
RAM is much more constrained than ROM, so it's worth it to give ourselves the
|
|
trouble of compiling defs to binary.
|
|
|
|
*/
|
|
|
|
#define RAMSTART 0
|
|
#define STDIO_PORT 0x00
|
|
// To know which part of RAM to dump, we listen to port 2, which at the end of
|
|
// its compilation process, spits its HERE addr to port 2 (MSB first)
|
|
#define HERE_PORT 0x02
|
|
|
|
static int running;
|
|
// We support double-pokes, that is, a first poke to tell where to start the
|
|
// dump and a second one to tell where to stop. If there is only one poke, it's
|
|
// then ending HERE and we start at sizeof(KERNEL).
|
|
static uint16_t start_here = 0;
|
|
static uint16_t end_here = 0;
|
|
|
|
static uint8_t iord_stdio()
|
|
{
|
|
int c = getc(stdin);
|
|
if (c == EOF) {
|
|
running = 0;
|
|
}
|
|
return (uint8_t)c;
|
|
}
|
|
|
|
static void iowr_stdio(uint8_t val)
|
|
{
|
|
// comment if you don't like verbose staging output
|
|
putc(val, stderr);
|
|
}
|
|
|
|
static void iowr_here(uint8_t val)
|
|
{
|
|
start_here <<=8;
|
|
start_here |= (end_here >> 8);
|
|
end_here <<= 8;
|
|
end_here |= val;
|
|
}
|
|
|
|
int main(int argc, char *argv[])
|
|
{
|
|
Machine *m = emul_init();
|
|
if (m == NULL) {
|
|
return 1;
|
|
}
|
|
m->ramstart = RAMSTART;
|
|
m->iord[STDIO_PORT] = iord_stdio;
|
|
m->iowr[STDIO_PORT] = iowr_stdio;
|
|
m->iowr[HERE_PORT] = iowr_here;
|
|
// Run!
|
|
running = 1;
|
|
|
|
while (running && emul_step());
|
|
|
|
// We're done, now let's spit dict data
|
|
for (int i=start_here; i<end_here; i++) {
|
|
putchar(m->mem[i]);
|
|
}
|
|
emul_deinit();
|
|
emul_printdebug();
|
|
return 0;
|
|
}
|
|
|