Apple-2-SW
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Applerm-II
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Bug fix: stack is hard :( 

SP should wrap correctly on push and pop
This commit is contained in:
Takashi Toyoshima 2014-12-08 02:43:05 +09:00
parent 9098230d7d
commit 77fa2964f1
4 changed files with 51 additions and 13 deletions
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47
6502.S
View File

@ -91,6 +91,11 @@
_stb
mov r0, SP
subs r0, r0, #1
cmp r0, #0xff
bne 1f
lsls r0, r0, #1
adds r0, r0, #1
1:
mov SP, r0
.endm
@ -101,30 +106,55 @@
_stb
mov r0, SP
subs r0, r0, #1
cmp r0, #0xff
bne 1f
lsls r0, r0, #1
adds r0, r0, #1
1:
mov SP, r0
mov r1, \reg
_stb
mov r0, SP
subs r0, r0, #2
subs r0, r0, #1
cmp r0, #0xff
bne 1f
lsls r0, r0, #1
adds r0, r0, #1
1:
mov SP, r0
.endm
.macro _popb
mov r0, SP
adds r0, r0, #1
lsrs r1, r0, #10
bcc 1f
lsrs r0, r0, #1
1:
mov SP, r0
_ldb
.endm
.macro _popw
mov T0, SP
adds r0, T0, #1
mov r0, SP
adds r0, r0, #1
lsrs r1, r0, #10
bcc 1f
lsrs r0, r0, #1
1:
mov SP, r0
_ldb
mov T1, r0
adds r0, T0, #2
mov T0, r0
mov r0, SP
adds r0, r0, #1
lsrs r1, r0, #10
bcc 1f
lsrs r0, r0, #1
1:
mov SP, r0
_ldb
lsls r0, r0, #8
adds r0, r0, T1
adds r0, r0, T0
.endm
.macro _decode
@ -1271,10 +1301,11 @@ op99: // STA - Absolute, Y
_decode
op9a: // TXS
_t RX, SP
movs r0, #1
lsls r0, r0, #8
add SP, SP, r0
add r0, RX, r0
mov SP, r0
adds PC, PC, #1
_decode
op9d: // STA - Absolute, X

2
Makefile
View File

@ -54,7 +54,7 @@ run: $(APP).bin
$(LPC21ISP) -control -term -bin $(APP).bin $(SERIAL) $(SPEED) $(CLOCK)
clean:
rm -rf $(APP).bin $(APP) $(OBJS) test
rm -rf $(APP).bin $(APP) $(OBJS) test ftest
# Use this build target to install required packages if you are on Ubuntu14.04.
install-deps:

13
ftest.c
View File

@ -1,3 +1,4 @@
#include <assert.h>
#include <stdio.h>
#include <stdint.h>
#include <stdlib.h>
@ -14,15 +15,21 @@ void prn(int c) {
__asm__("movs r12, %0":: "r"(fp));
}
void cpu6502_dump(
uint16_t pc, uint8_t a, uint8_t x, uint8_t y, uint8_t sp, uint8_t sr) {
void cpu6502_dump(uint32_t pc, uint32_t a, uint32_t x, uint32_t y,
uint32_t sp, uint32_t sr) {
uint8_t fp;
__asm__("movs %0, r12": "=r"(fp));
fprintf(stderr, "*** dump *** PC=$%04x A=$%02x X=$%02x Y=$%02x SP=$%02x "
"NV-B_DIZC=%d%d-%d_%d%d%d%d\n",
pc, a, x, y, sp, (sr >> 7) & 1, (sr >> 6) & 1, (sr >> 4) & 1,
pc, a, x, y, sp & 0xff, (sr >> 7) & 1, (sr >> 6) & 1, (sr >> 4) & 1,
(sr >> 3) & 1, (sr >> 2) & 1, (sr >> 1) & 1, sr & 1);
fflush(stderr);
assert(pc < 0x10000);
assert(a < 0x100);
assert(x < 0x100);
assert(y < 0x100);
assert(sr < 0x100);
assert(0x100 <= sp && sp < 0x200);
__asm__("movs r12, %0":: "r"(fp));
}

2
test.c
View File

@ -28,7 +28,7 @@ void cpu6502_dump(uint32_t pc, uint32_t a, uint32_t x, uint32_t y,
assert(0x100 <= sp && sp < 0x200);
fprintf(stderr, "*** dump *** PC=$%04x A=$%02x X=$%02x Y=$%02x SP=$%02x "
"NV-B_DIZC=%d%d-%d_%d%d%d%d\n",
pc, a, x, y, sp, (sr >> 7) & 1, (sr >> 6) & 1, (sr >> 4) & 1,
pc, a, x, y, sp & 0xff, (sr >> 7) & 1, (sr >> 6) & 1, (sr >> 4) & 1,
(sr >> 3) & 1, (sr >> 2) & 1, (sr >> 1) & 1, sr & 1);
fflush(stderr);
__asm__("movs r12, %0":: "r"(fp));