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;--------------------------------------------------------------------------
; crtxpush.asm :- C run-time: push registers (not R0) to xstack
;
; Copyright (C) 2009, Maarten Brock
;
; This library is free software; you can redistribute it and/or modify it
; under the terms of the GNU General Public License as published by the
; Free Software Foundation; either version 2, or (at your option) any
; later version.
;
; This library is distributed in the hope that it will be useful,
; but WITHOUT ANY WARRANTY; without even the implied warranty of
; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
; GNU General Public License for more details.
;
; You should have received a copy of the GNU General Public License
; along with this library; see the file COPYING. If not, write to the
; Free Software Foundation, 51 Franklin Street, Fifth Floor, Boston,
; MA 02110-1301, USA.
;
; As a special exception, if you link this library with other files,
; some of which are compiled with SDCC, to produce an executable,
; this library does not by itself cause the resulting executable to
; be covered by the GNU General Public License. This exception does
; not however invalidate any other reasons why the executable file
; might be covered by the GNU General Public License.
;--------------------------------------------------------------------------
;--------------------------------------------------------
; overlayable bit register bank
;--------------------------------------------------------
.area BIT_BANK (REL,OVR,DATA)
bits:
.ds 1
ar0 = 0x00
ar1 = 0x01
.area HOME (CODE)
; Push registers r1..r7 & bits on xstack
; Expect allocation size in ACC and mask in B
___sdcc_xpush_regs::
add a,_spx
mov _spx,a
xch a,r0
___sdcc_xpush::
push acc
jbc B.0,00100$ ;if B(0)=0 then
mov a,bits ;push bits
dec r0
movx @r0,a
00100$:
jbc B.1,00101$ ;if B(1)=0 then
mov a,r1 ;push R1
dec r0
movx @r0,a
00101$:
jbc B.2,00102$ ;if B(2)=0 then
mov a,r2 ;push R2
dec r0
movx @r0,a
00102$:
jbc B.3,00103$ ;if B(3)=0 then
mov a,r3 ;push R3
dec r0
movx @r0,a
00103$:
jbc B.4,00104$ ;if B(4)=0 then
mov a,r4 ;push R4
dec r0
movx @r0,a
00104$:
jbc B.5,00105$ ;if B(5)=0 then
mov a,r5 ;push R5
dec r0
movx @r0,a
00105$:
jbc B.6,00106$ ;if B(6)=0 then
mov a,r6 ;push R6
dec r0
movx @r0,a
00106$:
jbc B.7,00107$ ;if B(7)=0 then
mov a,r7 ;push R7
dec r0
movx @r0,a
00107$:
pop ar0
ret
|
