_setjmp.S revision 1.4
1 /* $NetBSD: _setjmp.S,v 1.4 2008/04/28 20:22:56 martin Exp $ */ 2 3 /*- 4 * Copyright (c) 2002 The NetBSD Foundation, Inc. 5 * All rights reserved. 6 * 7 * This code is derived from software contributed to The NetBSD Foundation 8 * by Matthew Fredette. 9 * 10 * Redistribution and use in source and binary forms, with or without 11 * modification, are permitted provided that the following conditions 12 * are met: 13 * 1. Redistributions of source code must retain the above copyright 14 * notice, this list of conditions and the following disclaimer. 15 * 2. Redistributions in binary form must reproduce the above copyright 16 * notice, this list of conditions and the following disclaimer in the 17 * documentation and/or other materials provided with the distribution. 18 * 19 * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS 20 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED 21 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 22 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS 23 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 24 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 25 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 26 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 27 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 28 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 29 * POSSIBILITY OF SUCH DAMAGE. 30 */ 31 32 #include <machine/asm.h> 33 /* XXX fredette - this is awful */ 34 #define _LOCORE 35 #include <machine/frame.h> 36 #undef _LOCORE 37 38 #if defined(LIBC_SCCS) && !defined(lint) 39 RCSID("$NetBSD: _setjmp.S,v 1.4 2008/04/28 20:22:56 martin Exp $") 40 #endif /* LIBC_SCCS and not lint */ 41 42 /* 43 * C library -- setjmp, longjmp 44 * 45 * longjmp(a,v) 46 * will generate a "return(v)" from 47 * the last call to 48 * setjmp(a) 49 * by restoring registers from the stack, 50 * and a struct sigcontext, see <signal.h> 51 */ 52 53 ENTRY(_setjmp,0) 54 /* A sigcontext is at the beginning of our jmp_buf. */ 55 stw %r0, 0(%arg0) ; no onstack 56 stw %r0, 4(%arg0) ; unused word (old style signal mask) 57 stw %sp, 8(%arg0) ; sc.sc_sp = %sp 58 stw %r0, 16(%arg0) ; sc.sc_ap = NULL 59 mfsp %sr0, %r1 60 stw %r1, 20(%arg0) ; sc.sc_pcsqh = %sr0 61 stw %rp, 24(%arg0) ; sc.sc_pcoqh = %rp 62 stw %r1, 28(%arg0) ; sc.sc_pcsqh = %sr0 63 ldo 4(%rp), %r1 64 stw %r1, 32(%arg0) ; sc.sc_pcoqt = %rp + 4 65 stw %r0, 36(%arg0) ; set sc.sc_ps 66 67 /* We store all callee-saved registers after the sigcontext. */ 68 ldo 56(%arg0), %r1 69 stwm %r3, 4(%r1) 70 stwm %r4, 4(%r1) 71 stwm %r5, 4(%r1) 72 stwm %r6, 4(%r1) 73 stwm %r7, 4(%r1) 74 stwm %r8, 4(%r1) 75 stwm %r9, 4(%r1) 76 stwm %r10, 4(%r1) 77 stwm %r11, 4(%r1) 78 stwm %r12, 4(%r1) 79 stwm %r13, 4(%r1) 80 stwm %r14, 4(%r1) 81 stwm %r15, 4(%r1) 82 stwm %r16, 4(%r1) 83 stwm %r17, 4(%r1) 84 stwm %r18, 4(%r1) 85 86 /* Return 0. */ 87 bv %r0(%rp) 88 copy %r0, %ret0 89 EXIT(_setjmp) 90 91 ENTRY(_longjmp,0) 92 ldw 8(%arg0), %r1 ; ensure non-zero SP 93 combt,=,n %r0, %r1, botch ; oops! 94 add,<> %r0, %arg1, %ret0 ; ensure return value non-zero 95 ldi 1, %ret0 96 97 /* restore callee-saved registers */ 98 ldo 56(%arg0), %r1 99 ldwm 4(%r1), %r3 100 ldwm 4(%r1), %r4 101 ldwm 4(%r1), %r5 102 ldwm 4(%r1), %r6 103 ldwm 4(%r1), %r7 104 ldwm 4(%r1), %r8 105 ldwm 4(%r1), %r9 106 ldwm 4(%r1), %r10 107 ldwm 4(%r1), %r11 108 ldwm 4(%r1), %r12 109 ldwm 4(%r1), %r13 110 ldwm 4(%r1), %r14 111 ldwm 4(%r1), %r15 112 ldwm 4(%r1), %r16 113 ldwm 4(%r1), %r17 114 ldwm 4(%r1), %r18 115 116 /* restore the rest */ 117 ldw 8(%arg0), %sp 118 ldw 24(%arg0), %rp 119 bv %r0(%rp) 120 nop 121 botch: 122 bl longjmperror, %rp 123 nop 124 bl abort, %rp 125 nop 126 EXIT(_longjmp) 127 128 .end 129
Indexes created Mon Oct 20 03:09:53 GMT 2025