_setjmp.S revision 1.5
1 1.5 skrll /* $NetBSD: _setjmp.S,v 1.5 2020/05/04 06:42:11 skrll 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 * 19 1.1 fredette * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS 20 1.1 fredette * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED 21 1.1 fredette * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 22 1.1 fredette * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS 23 1.1 fredette * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 24 1.1 fredette * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 25 1.1 fredette * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 26 1.1 fredette * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 27 1.1 fredette * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 28 1.1 fredette * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 29 1.1 fredette * POSSIBILITY OF SUCH DAMAGE. 30 1.1 fredette */ 31 1.1 fredette 32 1.1 fredette #include <machine/asm.h> 33 1.1 fredette #include <machine/frame.h> 34 1.1 fredette 35 1.1 fredette #if defined(LIBC_SCCS) && !defined(lint) 36 1.5 skrll RCSID("$NetBSD: _setjmp.S,v 1.5 2020/05/04 06:42:11 skrll Exp $") 37 1.1 fredette #endif /* LIBC_SCCS and not lint */ 38 1.1 fredette 39 1.1 fredette /* 40 1.1 fredette * C library -- setjmp, longjmp 41 1.1 fredette * 42 1.1 fredette * longjmp(a,v) 43 1.1 fredette * will generate a "return(v)" from 44 1.1 fredette * the last call to 45 1.1 fredette * setjmp(a) 46 1.1 fredette * by restoring registers from the stack, 47 1.1 fredette * and a struct sigcontext, see <signal.h> 48 1.1 fredette */ 49 1.1 fredette 50 1.1 fredette ENTRY(_setjmp,0) 51 1.1 fredette /* A sigcontext is at the beginning of our jmp_buf. */ 52 1.1 fredette stw %r0, 0(%arg0) ; no onstack 53 1.1 fredette stw %r0, 4(%arg0) ; unused word (old style signal mask) 54 1.1 fredette stw %sp, 8(%arg0) ; sc.sc_sp = %sp 55 1.1 fredette stw %r0, 16(%arg0) ; sc.sc_ap = NULL 56 1.1 fredette mfsp %sr0, %r1 57 1.1 fredette stw %r1, 20(%arg0) ; sc.sc_pcsqh = %sr0 58 1.1 fredette stw %rp, 24(%arg0) ; sc.sc_pcoqh = %rp 59 1.1 fredette stw %r1, 28(%arg0) ; sc.sc_pcsqh = %sr0 60 1.1 fredette ldo 4(%rp), %r1 61 1.1 fredette stw %r1, 32(%arg0) ; sc.sc_pcoqt = %rp + 4 62 1.1 fredette stw %r0, 36(%arg0) ; set sc.sc_ps 63 1.1 fredette 64 1.1 fredette /* We store all callee-saved registers after the sigcontext. */ 65 1.1 fredette ldo 56(%arg0), %r1 66 1.1 fredette stwm %r3, 4(%r1) 67 1.1 fredette stwm %r4, 4(%r1) 68 1.1 fredette stwm %r5, 4(%r1) 69 1.1 fredette stwm %r6, 4(%r1) 70 1.1 fredette stwm %r7, 4(%r1) 71 1.1 fredette stwm %r8, 4(%r1) 72 1.1 fredette stwm %r9, 4(%r1) 73 1.1 fredette stwm %r10, 4(%r1) 74 1.1 fredette stwm %r11, 4(%r1) 75 1.1 fredette stwm %r12, 4(%r1) 76 1.1 fredette stwm %r13, 4(%r1) 77 1.1 fredette stwm %r14, 4(%r1) 78 1.1 fredette stwm %r15, 4(%r1) 79 1.1 fredette stwm %r16, 4(%r1) 80 1.1 fredette stwm %r17, 4(%r1) 81 1.1 fredette stwm %r18, 4(%r1) 82 1.1 fredette 83 1.1 fredette /* Return 0. */ 84 1.1 fredette bv %r0(%rp) 85 1.1 fredette copy %r0, %ret0 86 1.1 fredette EXIT(_setjmp) 87 1.1 fredette 88 1.1 fredette ENTRY(_longjmp,0) 89 1.1 fredette ldw 8(%arg0), %r1 ; ensure non-zero SP 90 1.1 fredette combt,=,n %r0, %r1, botch ; oops! 91 1.1 fredette add,<> %r0, %arg1, %ret0 ; ensure return value non-zero 92 1.1 fredette ldi 1, %ret0 93 1.1 fredette 94 1.1 fredette /* restore callee-saved registers */ 95 1.1 fredette ldo 56(%arg0), %r1 96 1.1 fredette ldwm 4(%r1), %r3 97 1.1 fredette ldwm 4(%r1), %r4 98 1.1 fredette ldwm 4(%r1), %r5 99 1.1 fredette ldwm 4(%r1), %r6 100 1.1 fredette ldwm 4(%r1), %r7 101 1.1 fredette ldwm 4(%r1), %r8 102 1.1 fredette ldwm 4(%r1), %r9 103 1.1 fredette ldwm 4(%r1), %r10 104 1.1 fredette ldwm 4(%r1), %r11 105 1.1 fredette ldwm 4(%r1), %r12 106 1.1 fredette ldwm 4(%r1), %r13 107 1.1 fredette ldwm 4(%r1), %r14 108 1.1 fredette ldwm 4(%r1), %r15 109 1.1 fredette ldwm 4(%r1), %r16 110 1.1 fredette ldwm 4(%r1), %r17 111 1.1 fredette ldwm 4(%r1), %r18 112 1.1 fredette 113 1.1 fredette /* restore the rest */ 114 1.1 fredette ldw 8(%arg0), %sp 115 1.1 fredette ldw 24(%arg0), %rp 116 1.1 fredette bv %r0(%rp) 117 1.1 fredette nop 118 1.2 matt botch: 119 1.1 fredette bl longjmperror, %rp 120 1.1 fredette nop 121 1.3 chs bl abort, %rp 122 1.3 chs nop 123 1.1 fredette EXIT(_longjmp) 124 1.1 fredette 125 1.1 fredette .end 126
Indexes created Mon Oct 20 20:10:13 GMT 2025