1 1.7 skrll /* $NetBSD: _setjmp.S,v 1.7 2024/05/04 14:48:28 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 1.7 skrll #include "assym.h" 33 1.7 skrll 34 1.1 fredette #include <machine/asm.h> 35 1.1 fredette #include <machine/frame.h> 36 1.1 fredette 37 1.1 fredette #if defined(LIBC_SCCS) && !defined(lint) 38 1.7 skrll RCSID("$NetBSD: _setjmp.S,v 1.7 2024/05/04 14:48:28 skrll Exp $") 39 1.1 fredette #endif /* LIBC_SCCS and not lint */ 40 1.1 fredette 41 1.1 fredette /* 42 1.1 fredette * C library -- setjmp, longjmp 43 1.1 fredette * 44 1.1 fredette * longjmp(a,v) 45 1.1 fredette * will generate a "return(v)" from 46 1.1 fredette * the last call to 47 1.1 fredette * setjmp(a) 48 1.1 fredette * by restoring registers from the stack, 49 1.1 fredette * and a struct sigcontext, see <signal.h> 50 1.1 fredette */ 51 1.1 fredette 52 1.1 fredette ENTRY(_setjmp,0) 53 1.1 fredette /* A sigcontext is at the beginning of our jmp_buf. */ 54 1.7 skrll stw %r0, _SC_ONSTACK(%arg0) ; no onstack 55 1.7 skrll stw %r0, _SC_MASK13(%arg0) ; unused word (old style signal mask) 56 1.7 skrll stw %sp, _SC_REGS_SP(%arg0) ; sc.sc_sp = %sp 57 1.7 skrll stw %r0, _SC_REGS_AP(%arg0) ; sc.sc_ap = NULL 58 1.1 fredette mfsp %sr0, %r1 59 1.7 skrll stw %r1, _SC_REGS_PCSQH(%arg0) ; sc.sc_pcsqh = %sr0 60 1.7 skrll stw %rp, _SC_REGS_PCOQH(%arg0) ; sc.sc_pcoqh = %rp 61 1.7 skrll stw %r1, _SC_REGS_PCSQT(%arg0) ; sc.sc_pcsqh = %sr0 62 1.1 fredette ldo 4(%rp), %r1 63 1.7 skrll stw %r1, _SC_REGS_PCOQT(%arg0) ; sc.sc_pcoqt = %rp + 4 64 1.7 skrll stw %r0, _SC_REGS_PS(%arg0) ; set sc.sc_ps 65 1.1 fredette 66 1.1 fredette /* We store all callee-saved registers after the sigcontext. */ 67 1.7 skrll ldo SIZEOF_SIGCONTEXT(%arg0), %r1 68 1.1 fredette stwm %r3, 4(%r1) 69 1.1 fredette stwm %r4, 4(%r1) 70 1.1 fredette stwm %r5, 4(%r1) 71 1.1 fredette stwm %r6, 4(%r1) 72 1.1 fredette stwm %r7, 4(%r1) 73 1.1 fredette stwm %r8, 4(%r1) 74 1.1 fredette stwm %r9, 4(%r1) 75 1.1 fredette stwm %r10, 4(%r1) 76 1.1 fredette stwm %r11, 4(%r1) 77 1.1 fredette stwm %r12, 4(%r1) 78 1.1 fredette stwm %r13, 4(%r1) 79 1.1 fredette stwm %r14, 4(%r1) 80 1.1 fredette stwm %r15, 4(%r1) 81 1.1 fredette stwm %r16, 4(%r1) 82 1.1 fredette stwm %r17, 4(%r1) 83 1.1 fredette stwm %r18, 4(%r1) 84 1.1 fredette 85 1.1 fredette /* Return 0. */ 86 1.1 fredette bv %r0(%rp) 87 1.6 skrll copy %r0, %ret0 88 1.1 fredette EXIT(_setjmp) 89 1.1 fredette 90 1.1 fredette ENTRY(_longjmp,0) 91 1.7 skrll ldw _SC_REGS_SP(%arg0), %r1 ; ensure non-zero SP 92 1.1 fredette combt,=,n %r0, %r1, botch ; oops! 93 1.1 fredette add,<> %r0, %arg1, %ret0 ; ensure return value non-zero 94 1.1 fredette ldi 1, %ret0 95 1.1 fredette 96 1.1 fredette /* restore callee-saved registers */ 97 1.7 skrll ldo SIZEOF_SIGCONTEXT(%arg0), %r1 98 1.1 fredette ldwm 4(%r1), %r3 99 1.1 fredette ldwm 4(%r1), %r4 100 1.1 fredette ldwm 4(%r1), %r5 101 1.1 fredette ldwm 4(%r1), %r6 102 1.1 fredette ldwm 4(%r1), %r7 103 1.1 fredette ldwm 4(%r1), %r8 104 1.1 fredette ldwm 4(%r1), %r9 105 1.1 fredette ldwm 4(%r1), %r10 106 1.1 fredette ldwm 4(%r1), %r11 107 1.1 fredette ldwm 4(%r1), %r12 108 1.1 fredette ldwm 4(%r1), %r13 109 1.1 fredette ldwm 4(%r1), %r14 110 1.1 fredette ldwm 4(%r1), %r15 111 1.1 fredette ldwm 4(%r1), %r16 112 1.1 fredette ldwm 4(%r1), %r17 113 1.1 fredette ldwm 4(%r1), %r18 114 1.1 fredette 115 1.1 fredette /* restore the rest */ 116 1.7 skrll ldw _SC_REGS_SP(%arg0), %sp 117 1.7 skrll ldw _SC_REGS_PCOQH(%arg0), %rp 118 1.1 fredette bv %r0(%rp) 119 1.6 skrll nop 120 1.2 matt botch: 121 1.1 fredette bl longjmperror, %rp 122 1.6 skrll nop 123 1.3 chs bl abort, %rp 124 1.6 skrll nop 125 1.1 fredette EXIT(_longjmp) 126 1.1 fredette 127 1.1 fredette .end 128
Indexes created Mon Oct 20 20:10:13 GMT 2025