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|
;--------------------------------------------------------------------------
; setjmp.s
;
; Copyright (C) 2011-2014, Philipp Klaus Krause
;
; 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.
;--------------------------------------------------------------------------
.area _CODE
.globl ___setjmp
___setjmp:
pop bc
pop de
push de
push bc
; Store stack pointer.
ldhl sp, #0
push de
push hl
pop de
pop hl
ld (hl), e
inc hl
ld (hl), d
inc hl
; Store return address.
ld (hl), c
inc hl
ld (hl), b
; Return 0.
xor a, a
ld e, a
ld d, a
ret
.globl _longjmp
_longjmp:
pop af
pop hl
pop de
; Ensure that return value is non-zero.
ld a, e
or a, d
jr NZ, 0001$
inc de
0001$:
; Get stack pointer.
ld c, (hl)
inc hl
ld b, (hl)
inc hl
; Adjust stack pointer.
push hl
push bc
pop hl
pop bc
ld sp, hl
push bc
pop hl
; Get return address.
ld c, (hl)
inc hl
ld b, (hl)
; Set return address.
pop af
push bc
; Return value is in de.
; Jump.
ret
|
