1 files changed, 74 insertions, 0 deletions
diff --git a/runtime_32.S b/runtime_32.S
new file mode 100644
index 0000000..1f0c503
--- /dev/null
+++ b/runtime_32.S
@@ -0,0 +1,74 @@
+
+
+invalid_msg:
+	.asciz "Invalid instruction at %X\n"
+
+	.global m68k_invalid
+m68k_invalid:
+	push %ecx
+	push invalid_msg
+	xor %eax, %eax
+	call printf
+	push $1
+	call exit
+
+	.global bcd_add
+bcd_add:
+	xchg %eax, %edi
+
+	mov %cl, %ch
+	mov %al, %ah
+	and $0xF, %ch
+	and $0xF, %ah
+	and $0xF0, %cl
+	and $0xF0, %al
+	add %ah, %ch
+	cmp $10, %ch
+	jb no_adjust
+	add $6, %ch
+no_adjust:
+	add %ch, %al
+	add %al, %cl
+	mov $0, %ch
+	jc def_adjust
+	cmp $0xA0, %cl
+	jb no_adjust_h
+def_adjust:
+	add $0x60, %cl
+	mov $1, %ch
+no_adjust_h:
+
+	mov %edi, %eax
+	ret
+
+	.global bcd_sub
+bcd_sub:
+	xchg %eax, %edi
+
+	mov %cl, %ch
+	mov %al, %ah
+	and $0xF, %ch
+	and $0xF, %ah
+	and $0xF0, %cl
+	and $0xF0, %al
+	sub %ah, %ch
+	cmp $10, %ch
+	jb no_adjusts
+	sub $6, %ch
+no_adjusts:
+	add %ch, %cl
+	sub %al, %cl
+	mov $0, %ch
+	jc def_adjusts
+	cmp $0xA0, %cl
+	jb no_adjust_hs
+def_adjusts:
+	sub $0x60, %cl
+	mov $1, %ch
+no_adjust_hs:
+
+	mov %edi, %eax
+	ret
+
+
+