_setjmp.S revision 1.7
1 /* $NetBSD: _setjmp.S,v 1.7 2024/05/04 14:48:28 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 "assym.h" 33 34 #include <machine/asm.h> 35 #include <machine/frame.h> 36 37 #if defined(LIBC_SCCS) && !defined(lint) 38 RCSID("$NetBSD: _setjmp.S,v 1.7 2024/05/04 14:48:28 skrll Exp $") 39 #endif /* LIBC_SCCS and not lint */ 40 41 /* 42 * C library -- setjmp, longjmp 43 * 44 * longjmp(a,v) 45 * will generate a "return(v)" from 46 * the last call to 47 * setjmp(a) 48 * by restoring registers from the stack, 49 * and a struct sigcontext, see <signal.h> 50 */ 51 52 ENTRY(_setjmp,0) 53 /* A sigcontext is at the beginning of our jmp_buf. */ 54 stw %r0, _SC_ONSTACK(%arg0) ; no onstack 55 stw %r0, _SC_MASK13(%arg0) ; unused word (old style signal mask) 56 stw %sp, _SC_REGS_SP(%arg0) ; sc.sc_sp = %sp 57 stw %r0, _SC_REGS_AP(%arg0) ; sc.sc_ap = NULL 58 mfsp %sr0, %r1 59 stw %r1, _SC_REGS_PCSQH(%arg0) ; sc.sc_pcsqh = %sr0 60 stw %rp, _SC_REGS_PCOQH(%arg0) ; sc.sc_pcoqh = %rp 61 stw %r1, _SC_REGS_PCSQT(%arg0) ; sc.sc_pcsqh = %sr0 62 ldo 4(%rp), %r1 63 stw %r1, _SC_REGS_PCOQT(%arg0) ; sc.sc_pcoqt = %rp + 4 64 stw %r0, _SC_REGS_PS(%arg0) ; set sc.sc_ps 65 66 /* We store all callee-saved registers after the sigcontext. */ 67 ldo SIZEOF_SIGCONTEXT(%arg0), %r1 68 stwm %r3, 4(%r1) 69 stwm %r4, 4(%r1) 70 stwm %r5, 4(%r1) 71 stwm %r6, 4(%r1) 72 stwm %r7, 4(%r1) 73 stwm %r8, 4(%r1) 74 stwm %r9, 4(%r1) 75 stwm %r10, 4(%r1) 76 stwm %r11, 4(%r1) 77 stwm %r12, 4(%r1) 78 stwm %r13, 4(%r1) 79 stwm %r14, 4(%r1) 80 stwm %r15, 4(%r1) 81 stwm %r16, 4(%r1) 82 stwm %r17, 4(%r1) 83 stwm %r18, 4(%r1) 84 85 /* Return 0. */ 86 bv %r0(%rp) 87 copy %r0, %ret0 88 EXIT(_setjmp) 89 90 ENTRY(_longjmp,0) 91 ldw _SC_REGS_SP(%arg0), %r1 ; ensure non-zero SP 92 combt,=,n %r0, %r1, botch ; oops! 93 add,<> %r0, %arg1, %ret0 ; ensure return value non-zero 94 ldi 1, %ret0 95 96 /* restore callee-saved registers */ 97 ldo SIZEOF_SIGCONTEXT(%arg0), %r1 98 ldwm 4(%r1), %r3 99 ldwm 4(%r1), %r4 100 ldwm 4(%r1), %r5 101 ldwm 4(%r1), %r6 102 ldwm 4(%r1), %r7 103 ldwm 4(%r1), %r8 104 ldwm 4(%r1), %r9 105 ldwm 4(%r1), %r10 106 ldwm 4(%r1), %r11 107 ldwm 4(%r1), %r12 108 ldwm 4(%r1), %r13 109 ldwm 4(%r1), %r14 110 ldwm 4(%r1), %r15 111 ldwm 4(%r1), %r16 112 ldwm 4(%r1), %r17 113 ldwm 4(%r1), %r18 114 115 /* restore the rest */ 116 ldw _SC_REGS_SP(%arg0), %sp 117 ldw _SC_REGS_PCOQH(%arg0), %rp 118 bv %r0(%rp) 119 nop 120 botch: 121 bl longjmperror, %rp 122 nop 123 bl abort, %rp 124 nop 125 EXIT(_longjmp) 126 127 .end 128
Indexes created Sun Oct 19 02:09:48 GMT 2025