mirror of
https://github.com/cc65/cc65.git
synced 2024-11-18 00:07:21 +00:00
53dd513176
which included commits to RCS files with non-trunk default branches. git-svn-id: svn://svn.cc65.org/cc65/trunk@3 b7a2c559-68d2-44c3-8de9-860c34a00d81
37 lines
527 B
ArmAsm
37 lines
527 B
ArmAsm
;
|
|
; Ullrich von Bassewitz, 05.08.1998
|
|
;
|
|
; CC65 runtime: long sub
|
|
;
|
|
|
|
;
|
|
; EAX = TOS - EAX
|
|
;
|
|
.export tossubeax
|
|
.import addysp1
|
|
.importzp sp, sreg, tmp1, tmp2
|
|
|
|
tossubeax:
|
|
ldy #0
|
|
sec
|
|
sta tmp1
|
|
lda (sp),y
|
|
sbc tmp1 ; byte 0
|
|
sta tmp2 ; use as temp storage
|
|
iny
|
|
stx tmp1
|
|
lda (sp),y
|
|
sbc tmp1 ; byte 1
|
|
tax
|
|
iny
|
|
lda (sp),y
|
|
sbc sreg ; byte 2
|
|
sta sreg
|
|
iny
|
|
lda (sp),y
|
|
sbc sreg+1 ; byte 3
|
|
sta sreg+1
|
|
lda tmp2 ; load byte 0
|
|
jmp addysp1 ; drop TOS
|
|
|