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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 hl
pop iy
push af
push hl
; Store return address.
ld 0(iy), l
ld 1(iy), h
; Store stack pointer.
xor a, a
ld l, a
ld h, a
add hl, sp
ld 2(iy), l
ld 3(iy), h
; Store frame pointer.
push ix
pop hl
ld 4(iy), l
ld 5(iy), h
; Return 0.
ld l, a
ld h, a
ret
.globl _longjmp
_longjmp:
pop de
pop iy
pop de
; Ensure that return value is non-zero.
ld a, e
or a, d
jr NZ, jump
inc de
jump:
; Restore frame pointer.
ld l, 4(iy)
ld h, 5(iy)
push hl
pop ix
; Adjust stack pointer.
ld l, 2(iy)
ld h, 3(iy)
ld sp, hl
pop hl
; Move return value into hl.
ex de, hl
; Jump.
ld c, 0(iy)
ld b, 1(iy)
push bc
ret
|
