zasm: implement stdin/stdout in emulator

This commit is contained in:
Virgil Dupras 2019-04-16 13:59:19 -04:00
parent 1ae2331763
commit 43c1005d61
3 changed files with 29 additions and 7 deletions

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@ -4,10 +4,12 @@ ld sp, hl
; zasm input ; zasm input
ld hl, 0x9000 ld hl, 0x9000
; zasm output ; zasm output
ld hl, 0xc000 ld de, 0xc000
call zasm call zasm
; signal the emulator we're done ; signal the emulator we're done
out (0), a ; BC contains the number of written bytes
ld a, b
out (c), a
halt halt
zasm: zasm:
; beginning of the code ; beginning of the code

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@ -1,4 +1,5 @@
#include <stdint.h> #include <stdint.h>
#include <stdio.h>
#include "libz80/z80.h" #include "libz80/z80.h"
#include "wrapper.h" #include "wrapper.h"
#include "zasm.h" #include "zasm.h"
@ -10,9 +11,17 @@
* zasm in a special wrapper, wait until we receive the stop signal, then * zasm in a special wrapper, wait until we receive the stop signal, then
* spit the contents of the dest memory to stdout. * spit the contents of the dest memory to stdout.
*/ */
// in sync with wrapper.asm
#define READFROM 0x9000
#define WRITETO 0xc000
static Z80Context cpu; static Z80Context cpu;
static uint8_t mem[0xffff]; static uint8_t mem[0xffff];
static int running; static int running;
// Number of bytes written to WRITETO
// We receive that result from an OUT (C), A call. C contains LSB, A is MSB.
static uint16_t written;
static uint8_t io_read(int unused, uint16_t addr) static uint8_t io_read(int unused, uint16_t addr)
@ -22,8 +31,7 @@ static uint8_t io_read(int unused, uint16_t addr)
static void io_write(int unused, uint16_t addr, uint8_t val) static void io_write(int unused, uint16_t addr, uint8_t val)
{ {
// zasm doesn't do any IO. If we receive any IO, it means that we're done written = (val << 8) + (addr & 0xff);
// because the wrapper told us through an "out"
running = 0; running = 0;
} }
@ -48,6 +56,13 @@ int main()
for (int i=0; i<zasm; i++) { for (int i=0; i<zasm; i++) {
mem[i+wrapperlen] = ZASM[i]; mem[i+wrapperlen] = ZASM[i];
} }
int ptr = READFROM;
int c = getchar();
while (c != EOF) {
mem[ptr] = c;
ptr++;
c = getchar();
}
// Run! // Run!
running = 1; running = 1;
Z80RESET(&cpu); Z80RESET(&cpu);
@ -59,6 +74,9 @@ int main()
while (running) { while (running) {
Z80Execute(&cpu); Z80Execute(&cpu);
} }
printf("and... %d!\n", mem[0x100]);
for (int i=0; i<written; i++) {
putchar(mem[WRITETO+i]);
}
return 0; return 0;
} }

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@ -1,4 +1,6 @@
; dummy code, to test emulator ; dummy code, to test emulator
ld a, 0x42 ld a, (hl)
ld (0x100), a inc a
ld (de), a
ld bc, 1
ret ret