swapcontext.S revision 1.9.28.1
1 1.9.28.1 tls /* $NetBSD: swapcontext.S,v 1.9.28.1 2014/08/20 00:02:11 tls Exp $ */ 2 1.2 thorpej 3 1.2 thorpej /*- 4 1.2 thorpej * Copyright (c) 2001 The NetBSD Foundation, Inc. 5 1.2 thorpej * All rights reserved. 6 1.2 thorpej * 7 1.2 thorpej * This code is derived from software contributed to The NetBSD Foundation 8 1.2 thorpej * by Klaus Klein. 9 1.2 thorpej * 10 1.2 thorpej * Redistribution and use in source and binary forms, with or without 11 1.2 thorpej * modification, are permitted provided that the following conditions 12 1.2 thorpej * are met: 13 1.2 thorpej * 1. Redistributions of source code must retain the above copyright 14 1.2 thorpej * notice, this list of conditions and the following disclaimer. 15 1.2 thorpej * 2. Redistributions in binary form must reproduce the above copyright 16 1.2 thorpej * notice, this list of conditions and the following disclaimer in the 17 1.2 thorpej * documentation and/or other materials provided with the distribution. 18 1.2 thorpej * 19 1.2 thorpej * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS 20 1.2 thorpej * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED 21 1.2 thorpej * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 22 1.2 thorpej * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS 23 1.2 thorpej * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 24 1.2 thorpej * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 25 1.2 thorpej * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 26 1.2 thorpej * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 27 1.2 thorpej * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 28 1.2 thorpej * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 29 1.2 thorpej * POSSIBILITY OF SUCH DAMAGE. 30 1.2 thorpej */ 31 1.2 thorpej 32 1.2 thorpej #include <machine/asm.h> 33 1.2 thorpej #if defined(SYSLIBC_SCCS) && !defined(lint) 34 1.9.28.1 tls RCSID("$NetBSD: swapcontext.S,v 1.9.28.1 2014/08/20 00:02:11 tls Exp $") 35 1.2 thorpej #endif /* SYSLIBC_SCCS and not lint */ 36 1.2 thorpej 37 1.4 uwe /* 38 1.4 uwe * int 39 1.4 uwe * swapcontext(ucontext_t * restrict oucp, ucontext_t * restrict ucp); 40 1.4 uwe */ 41 1.2 thorpej ENTRY(swapcontext) 42 1.7 uwe PIC_PROLOGUE(.L_got) 43 1.4 uwe mov.l r5, @-sp 44 1.4 uwe sts.l pr, @-sp 45 1.6 uwe 46 1.4 uwe mov.l .L__getcontext, r0 47 1.4 uwe 1: CALL r0 /* _getcontext(oucp) */ 48 1.4 uwe mov.l r4, @-sp 49 1.4 uwe mov.l @sp+, r1 50 1.2 thorpej tst r0, r0 51 1.4 uwe bf 3f /* return error from getcontext */ 52 1.4 uwe 53 1.5 uwe /* Note: getcontext does _UC_MACHINE_INTRV(oucp) = 0 for us */ 54 1.4 uwe mov.l @sp, r0 55 1.5 uwe mov.l r0, @(36 + 1 * 4, r1) /* _UC_MACHINE_SET_PC(oucp, pr) */ 56 1.4 uwe mov.l .L_setcontext, r2 57 1.4 uwe 2: CALL r2 /* setcontext(ucp) */ 58 1.4 uwe mov.l @(4, sp), r4 59 1.4 uwe /* if we get here, return error from setcontext */ 60 1.4 uwe 3: 61 1.4 uwe lds.l @sp+, pr 62 1.9.28.1 tls #ifdef __PIC__ 63 1.6 uwe add #4, sp 64 1.6 uwe rts 65 1.6 uwe PIC_EPILOGUE 66 1.6 uwe #else 67 1.2 thorpej rts 68 1.4 uwe add #4, sp 69 1.6 uwe #endif 70 1.2 thorpej 71 1.2 thorpej .align 2 72 1.6 uwe .L_got: PIC_GOT_DATUM 73 1.6 uwe .L__getcontext: CALL_DATUM(_C_LABEL(_getcontext), 1b) 74 1.6 uwe .L_setcontext: CALL_DATUM(_C_LABEL(setcontext), 2b) 75 1.8 uwe SET_ENTRY_SIZE(swapcontext) 76
Indexes created Mon Oct 13 08:09:50 GMT 2025