_setjmp.S revision 1.6
1 /* $NetBSD: _setjmp.S,v 1.6 2020/05/05 06:20:55 skrll 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 #include <machine/frame.h> 34 35 #if defined(LIBC_SCCS) && !defined(lint) 36 RCSID("$NetBSD: _setjmp.S,v 1.6 2020/05/05 06:20:55 skrll Exp $") 37 #endif /* LIBC_SCCS and not lint */ 38 39 /* 40 * C library -- setjmp, longjmp 41 * 42 * longjmp(a,v) 43 * will generate a "return(v)" from 44 * the last call to 45 * setjmp(a) 46 * by restoring registers from the stack, 47 * and a struct sigcontext, see <signal.h> 48 */ 49 50 ENTRY(_setjmp,0) 51 /* A sigcontext is at the beginning of our jmp_buf. */ 52 stw %r0, 0(%arg0) ; no onstack 53 stw %r0, 4(%arg0) ; unused word (old style signal mask) 54 stw %sp, 8(%arg0) ; sc.sc_sp = %sp 55 stw %r0, 16(%arg0) ; sc.sc_ap = NULL 56 mfsp %sr0, %r1 57 stw %r1, 20(%arg0) ; sc.sc_pcsqh = %sr0 58 stw %rp, 24(%arg0) ; sc.sc_pcoqh = %rp 59 stw %r1, 28(%arg0) ; sc.sc_pcsqh = %sr0 60 ldo 4(%rp), %r1 61 stw %r1, 32(%arg0) ; sc.sc_pcoqt = %rp + 4 62 stw %r0, 36(%arg0) ; set sc.sc_ps 63 64 /* We store all callee-saved registers after the sigcontext. */ 65 ldo 56(%arg0), %r1 66 stwm %r3, 4(%r1) 67 stwm %r4, 4(%r1) 68 stwm %r5, 4(%r1) 69 stwm %r6, 4(%r1) 70 stwm %r7, 4(%r1) 71 stwm %r8, 4(%r1) 72 stwm %r9, 4(%r1) 73 stwm %r10, 4(%r1) 74 stwm %r11, 4(%r1) 75 stwm %r12, 4(%r1) 76 stwm %r13, 4(%r1) 77 stwm %r14, 4(%r1) 78 stwm %r15, 4(%r1) 79 stwm %r16, 4(%r1) 80 stwm %r17, 4(%r1) 81 stwm %r18, 4(%r1) 82 83 /* Return 0. */ 84 bv %r0(%rp) 85 copy %r0, %ret0 86 EXIT(_setjmp) 87 88 ENTRY(_longjmp,0) 89 ldw 8(%arg0), %r1 ; ensure non-zero SP 90 combt,=,n %r0, %r1, botch ; oops! 91 add,<> %r0, %arg1, %ret0 ; ensure return value non-zero 92 ldi 1, %ret0 93 94 /* restore callee-saved registers */ 95 ldo 56(%arg0), %r1 96 ldwm 4(%r1), %r3 97 ldwm 4(%r1), %r4 98 ldwm 4(%r1), %r5 99 ldwm 4(%r1), %r6 100 ldwm 4(%r1), %r7 101 ldwm 4(%r1), %r8 102 ldwm 4(%r1), %r9 103 ldwm 4(%r1), %r10 104 ldwm 4(%r1), %r11 105 ldwm 4(%r1), %r12 106 ldwm 4(%r1), %r13 107 ldwm 4(%r1), %r14 108 ldwm 4(%r1), %r15 109 ldwm 4(%r1), %r16 110 ldwm 4(%r1), %r17 111 ldwm 4(%r1), %r18 112 113 /* restore the rest */ 114 ldw 8(%arg0), %sp 115 ldw 24(%arg0), %rp 116 bv %r0(%rp) 117 nop 118 botch: 119 bl longjmperror, %rp 120 nop 121 bl abort, %rp 122 nop 123 EXIT(_longjmp) 124 125 .end 126
Indexes created Sun Oct 19 02:09:48 GMT 2025