minix/lib/nbsd_libc/arch/mips/gen/swapcontext.S

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/* $NetBSD: swapcontext.S,v 1.4 2009/12/14 01:07:42 matt Exp $ */
/*-
* Copyright (c) 2001 The NetBSD Foundation, Inc.
* All rights reserved.
*
* This code is derived from software contributed to The NetBSD Foundation
* by Klaus Klein.
*
* 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 "SYS.h"
#include "assym.h"
#if defined(SYSLIBC_SCCS) && !defined(lint)
RCSID("$NetBSD: swapcontext.S,v 1.4 2009/12/14 01:07:42 matt Exp $")
#endif /* SYSLIBC_SCCS && !lint */
.set reorder
NESTED(swapcontext, CALLFRAME_SIZ, ra)
.mask 0x80000030, (CALLFRAME_RA - CALLFRAME_SIZ)
PTR_SUBU sp, sp, CALLFRAME_SIZ
PTR_S ra, CALLFRAME_RA(sp) # save ra
PTR_S a0, 0(sp) # stash away oucp
PTR_S a1, SZREG(sp) # stash away ucp
SYSTRAP(getcontext)
PTR_L ra, CALLFRAME_RA(sp)
bne a3, zero, 1f
PTR_L v1, 0(sp) # load oucp again for adjustment
PTR_L a0, SZREG(sp) # load ucp
PTR_ADDIU v0, sp, CALLFRAME_SIZ
REG_PROLOGUE
REG_S zero, _OFFSETOF_UC_GREGS_V0(v1)
REG_S ra, _OFFSETOF_UC_GREGS_EPC(v1)
REG_S v0, _OFFSETOF_UC_GREGS_SP(v1)
REG_EPILOGUE
SYSTRAP(setcontext)
/* NOTREACHED */
1:
PTR_ADDU sp, sp, CALLFRAME_SIZ
SETUP_GPX(t0);
SETUP_GP64(t3,swapcontext);
PIC_TAILCALL(__cerror)
END(swapcontext)