_setjmp.S revision 1.2
1 1.2 matt /* $NetBSD: _setjmp.S,v 1.2 2003/10/06 05:30:21 matt Exp $ */ 2 1.1 fredette 3 1.1 fredette /*- 4 1.1 fredette * Copyright (c) 2002 The NetBSD Foundation, Inc. 5 1.1 fredette * All rights reserved. 6 1.1 fredette * 7 1.1 fredette * This code is derived from software contributed to The NetBSD Foundation 8 1.1 fredette * by Matthew Fredette. 9 1.1 fredette * 10 1.1 fredette * Redistribution and use in source and binary forms, with or without 11 1.1 fredette * modification, are permitted provided that the following conditions 12 1.1 fredette * are met: 13 1.1 fredette * 1. Redistributions of source code must retain the above copyright 14 1.1 fredette * notice, this list of conditions and the following disclaimer. 15 1.1 fredette * 2. Redistributions in binary form must reproduce the above copyright 16 1.1 fredette * notice, this list of conditions and the following disclaimer in the 17 1.1 fredette * documentation and/or other materials provided with the distribution. 18 1.1 fredette * 3. All advertising materials mentioning features or use of this software 19 1.1 fredette * must display the following acknowledgement: 20 1.1 fredette * This product includes software developed by the NetBSD 21 1.1 fredette * Foundation, Inc. and its contributors. 22 1.1 fredette * 4. Neither the name of The NetBSD Foundation nor the names of its 23 1.1 fredette * contributors may be used to endorse or promote products derived 24 1.1 fredette * from this software without specific prior written permission. 25 1.1 fredette * 26 1.1 fredette * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS 27 1.1 fredette * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED 28 1.1 fredette * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 29 1.1 fredette * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS 30 1.1 fredette * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 31 1.1 fredette * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 32 1.1 fredette * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 33 1.1 fredette * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 34 1.1 fredette * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 35 1.1 fredette * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 36 1.1 fredette * POSSIBILITY OF SUCH DAMAGE. 37 1.1 fredette */ 38 1.1 fredette 39 1.1 fredette #include <machine/asm.h> 40 1.1 fredette /* XXX fredette - this is awful */ 41 1.1 fredette #define _LOCORE 42 1.1 fredette #include <machine/frame.h> 43 1.1 fredette #undef _LOCORE 44 1.1 fredette 45 1.1 fredette #if defined(LIBC_SCCS) && !defined(lint) 46 1.2 matt RCSID("$NetBSD: _setjmp.S,v 1.2 2003/10/06 05:30:21 matt Exp $") 47 1.1 fredette #endif /* LIBC_SCCS and not lint */ 48 1.1 fredette 49 1.1 fredette /* 50 1.1 fredette * C library -- setjmp, longjmp 51 1.1 fredette * 52 1.1 fredette * longjmp(a,v) 53 1.1 fredette * will generate a "return(v)" from 54 1.1 fredette * the last call to 55 1.1 fredette * setjmp(a) 56 1.1 fredette * by restoring registers from the stack, 57 1.1 fredette * and a struct sigcontext, see <signal.h> 58 1.1 fredette */ 59 1.1 fredette 60 1.1 fredette ENTRY(_setjmp,0) 61 1.1 fredette /* A sigcontext is at the beginning of our jmp_buf. */ 62 1.1 fredette stw %r0, 0(%arg0) ; no onstack 63 1.1 fredette stw %r0, 4(%arg0) ; unused word (old style signal mask) 64 1.1 fredette stw %sp, 8(%arg0) ; sc.sc_sp = %sp 65 1.1 fredette stw %r0, 16(%arg0) ; sc.sc_ap = NULL 66 1.1 fredette mfsp %sr0, %r1 67 1.1 fredette stw %r1, 20(%arg0) ; sc.sc_pcsqh = %sr0 68 1.1 fredette stw %rp, 24(%arg0) ; sc.sc_pcoqh = %rp 69 1.1 fredette stw %r1, 28(%arg0) ; sc.sc_pcsqh = %sr0 70 1.1 fredette ldo 4(%rp), %r1 71 1.1 fredette stw %r1, 32(%arg0) ; sc.sc_pcoqt = %rp + 4 72 1.1 fredette stw %r0, 36(%arg0) ; set sc.sc_ps 73 1.1 fredette 74 1.1 fredette /* We store all callee-saved registers after the sigcontext. */ 75 1.1 fredette ldo 56(%arg0), %r1 76 1.1 fredette stwm %r3, 4(%r1) 77 1.1 fredette stwm %r4, 4(%r1) 78 1.1 fredette stwm %r5, 4(%r1) 79 1.1 fredette stwm %r6, 4(%r1) 80 1.1 fredette stwm %r7, 4(%r1) 81 1.1 fredette stwm %r8, 4(%r1) 82 1.1 fredette stwm %r9, 4(%r1) 83 1.1 fredette stwm %r10, 4(%r1) 84 1.1 fredette stwm %r11, 4(%r1) 85 1.1 fredette stwm %r12, 4(%r1) 86 1.1 fredette stwm %r13, 4(%r1) 87 1.1 fredette stwm %r14, 4(%r1) 88 1.1 fredette stwm %r15, 4(%r1) 89 1.1 fredette stwm %r16, 4(%r1) 90 1.1 fredette stwm %r17, 4(%r1) 91 1.1 fredette stwm %r18, 4(%r1) 92 1.1 fredette 93 1.1 fredette /* Return 0. */ 94 1.1 fredette bv %r0(%rp) 95 1.1 fredette copy %r0, %ret0 96 1.1 fredette EXIT(_setjmp) 97 1.1 fredette 98 1.1 fredette ENTRY(_longjmp,0) 99 1.1 fredette ldw 8(%arg0), %r1 ; ensure non-zero SP 100 1.1 fredette combt,=,n %r0, %r1, botch ; oops! 101 1.1 fredette add,<> %r0, %arg1, %ret0 ; ensure return value non-zero 102 1.1 fredette ldi 1, %ret0 103 1.1 fredette 104 1.1 fredette /* restore callee-saved registers */ 105 1.1 fredette ldo 56(%arg0), %r1 106 1.1 fredette ldwm 4(%r1), %r3 107 1.1 fredette ldwm 4(%r1), %r4 108 1.1 fredette ldwm 4(%r1), %r5 109 1.1 fredette ldwm 4(%r1), %r6 110 1.1 fredette ldwm 4(%r1), %r7 111 1.1 fredette ldwm 4(%r1), %r8 112 1.1 fredette ldwm 4(%r1), %r9 113 1.1 fredette ldwm 4(%r1), %r10 114 1.1 fredette ldwm 4(%r1), %r11 115 1.1 fredette ldwm 4(%r1), %r12 116 1.1 fredette ldwm 4(%r1), %r13 117 1.1 fredette ldwm 4(%r1), %r14 118 1.1 fredette ldwm 4(%r1), %r15 119 1.1 fredette ldwm 4(%r1), %r16 120 1.1 fredette ldwm 4(%r1), %r17 121 1.1 fredette ldwm 4(%r1), %r18 122 1.1 fredette 123 1.1 fredette /* restore the rest */ 124 1.1 fredette ldw 8(%arg0), %sp 125 1.1 fredette ldw 24(%arg0), %rp 126 1.1 fredette bv %r0(%rp) 127 1.1 fredette nop 128 1.2 matt botch: 129 1.1 fredette bl longjmperror, %rp 130 1.1 fredette nop 131 1.1 fredette EXIT(_longjmp) 132 1.1 fredette 133 1.1 fredette .end 134
Indexes created Tue Oct 21 08:09:48 GMT 2025