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/* $NetBSD: _setjmp.S,v 1.4 2008/04/28 20:22:56 martin Exp $ */
/*-
* Copyright (c) 2002 The NetBSD Foundation, Inc.
* All rights reserved.
*
* This code is derived from software contributed to The NetBSD Foundation
* by Matthew Fredette.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
* ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
* TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
* BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
* POSSIBILITY OF SUCH DAMAGE.
*/
#include <machine/asm.h>
/* XXX fredette - this is awful */
#define _LOCORE
#include <machine/frame.h>
#undef _LOCORE
#if defined(LIBC_SCCS) && !defined(lint)
RCSID("$NetBSD: _setjmp.S,v 1.4 2008/04/28 20:22:56 martin Exp $")
#endif /* LIBC_SCCS and not lint */
/*
* C library -- setjmp, longjmp
*
* longjmp(a,v)
* will generate a "return(v)" from
* the last call to
* setjmp(a)
* by restoring registers from the stack,
* and a struct sigcontext, see <signal.h>
*/
ENTRY(_setjmp,0)
/* A sigcontext is at the beginning of our jmp_buf. */
stw %r0, 0(%arg0) ; no onstack
stw %r0, 4(%arg0) ; unused word (old style signal mask)
stw %sp, 8(%arg0) ; sc.sc_sp = %sp
stw %r0, 16(%arg0) ; sc.sc_ap = NULL
mfsp %sr0, %r1
stw %r1, 20(%arg0) ; sc.sc_pcsqh = %sr0
stw %rp, 24(%arg0) ; sc.sc_pcoqh = %rp
stw %r1, 28(%arg0) ; sc.sc_pcsqh = %sr0
ldo 4(%rp), %r1
stw %r1, 32(%arg0) ; sc.sc_pcoqt = %rp + 4
stw %r0, 36(%arg0) ; set sc.sc_ps
/* We store all callee-saved registers after the sigcontext. */
ldo 56(%arg0), %r1
stwm %r3, 4(%r1)
stwm %r4, 4(%r1)
stwm %r5, 4(%r1)
stwm %r6, 4(%r1)
stwm %r7, 4(%r1)
stwm %r8, 4(%r1)
stwm %r9, 4(%r1)
stwm %r10, 4(%r1)
stwm %r11, 4(%r1)
stwm %r12, 4(%r1)
stwm %r13, 4(%r1)
stwm %r14, 4(%r1)
stwm %r15, 4(%r1)
stwm %r16, 4(%r1)
stwm %r17, 4(%r1)
stwm %r18, 4(%r1)
/* Return 0. */
bv %r0(%rp)
copy %r0, %ret0
EXIT(_setjmp)
ENTRY(_longjmp,0)
ldw 8(%arg0), %r1 ; ensure non-zero SP
combt,=,n %r0, %r1, botch ; oops!
add,<> %r0, %arg1, %ret0 ; ensure return value non-zero
ldi 1, %ret0
/* restore callee-saved registers */
ldo 56(%arg0), %r1
ldwm 4(%r1), %r3
ldwm 4(%r1), %r4
ldwm 4(%r1), %r5
ldwm 4(%r1), %r6
ldwm 4(%r1), %r7
ldwm 4(%r1), %r8
ldwm 4(%r1), %r9
ldwm 4(%r1), %r10
ldwm 4(%r1), %r11
ldwm 4(%r1), %r12
ldwm 4(%r1), %r13
ldwm 4(%r1), %r14
ldwm 4(%r1), %r15
ldwm 4(%r1), %r16
ldwm 4(%r1), %r17
ldwm 4(%r1), %r18
/* restore the rest */
ldw 8(%arg0), %sp
ldw 24(%arg0), %rp
bv %r0(%rp)
nop
botch:
bl longjmperror, %rp
nop
bl abort, %rp
nop
EXIT(_longjmp)
.end
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