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Return stack is Uint16 for now

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This commit is contained in:
neauoire 2021-02-05 18:41:45 -08:00
parent 2b1d44e862
commit 560ead0e32
1 changed files with 11 additions and 7 deletions
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18
uxn.c
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@ -24,6 +24,11 @@ typedef struct {
Uint8 dat[256];
} Stack;
typedef struct {
Uint8 ptr;
Uint16 dat[256];
} Stack16;
typedef struct {
Uint16 ptr;
Uint8 dat[65536];
@ -32,7 +37,8 @@ typedef struct {
typedef struct {
Uint8 literal, status;
Uint16 counter, vreset, vframe, verror;
Stack wst, rst;
Stack wst;
Stack16 rst;
Memory rom, ram;
} Computer;
@ -93,13 +99,11 @@ void wspush8(Uint8 b) { cpu.wst.dat[cpu.wst.ptr++] = b; }
Uint8 wspop8(void) { return cpu.wst.dat[--cpu.wst.ptr]; }
Uint16 wspop16(void) { return wspop8() + (wspop8() << 8); }
Uint8 wspeek8(void) { return cpu.wst.dat[cpu.wst.ptr - 1]; }
Uint16 rspop16(void) { return cpu.rst.dat[--cpu.rst.ptr] + (cpu.rst.dat[--cpu.rst.ptr] << 8); }
Uint16 rspop16(void) { return cpu.rst.dat[--cpu.rst.ptr]; }
void rspush16(Uint16 a) { cpu.rst.dat[cpu.rst.ptr++] = a; }
void op_brk() { setflag(FLAG_HALT, 1); }
void op_rts() {
cpu.rom.ptr = rspop16();
printf("RTS: %04x\n", cpu.rom.ptr);
}
void op_rts() { cpu.rom.ptr = rspop16(); }
void op_lit() { cpu.literal += cpu.rom.dat[cpu.rom.ptr++]; }
void op_drp() { wspop8(); }
void op_dup() { wspush8(wspeek8()); }
@ -107,7 +111,7 @@ void op_swp() { Uint8 b = wspop8(), a = wspop8(); wspush8(b); wspush8(a); }
void op_ovr() { wspush8(cpu.wst.dat[cpu.wst.ptr - 2]); }
void op_rot() { Uint8 c = wspop8(),b = wspop8(),a = wspop8(); wspush8(b); wspush8(c); wspush8(a); }
void op_jmu() { cpu.rom.ptr = wspop8(); }
void op_jsu() { cpu.rst.dat[cpu.rst.ptr++] = (cpu.rom.ptr >> 8) & 0xff; cpu.rst.dat[cpu.rst.ptr++] = cpu.rom.ptr; cpu.rom.ptr = wspop16(); }
void op_jsu() { rspush16(cpu.rom.ptr); cpu.rom.ptr = wspop16(); }
void op_jmc() { if(wspop8()) op_jmu(); }
void op_jsc() { if(wspop8()) op_jsu(); }
void op_equ() { wspush8(wspop8() == wspop8()); }