1/* $OpenBSD: setjmp.S,v 1.11 2016/05/29 07:59:36 guenther Exp $ */ 2 3/*- 4 * Copyright (c) 1990 The Regents of the University of California. 5 * All rights reserved. 6 * 7 * This code is derived from software contributed to Berkeley by 8 * the Systems Programming Group of the University of Utah Computer 9 * Science Department. 10 * 11 * Redistribution and use in source and binary forms, with or without 12 * modification, are permitted provided that the following conditions 13 * are met: 14 * 1. Redistributions of source code must retain the above copyright 15 * notice, this list of conditions and the following disclaimer. 16 * 2. Redistributions in binary form must reproduce the above copyright 17 * notice, this list of conditions and the following disclaimer in the 18 * documentation and/or other materials provided with the distribution. 19 * 3. Neither the name of the University nor the names of its contributors 20 * may be used to endorse or promote products derived from this software 21 * without specific prior written permission. 22 * 23 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 24 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 25 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 26 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 27 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 28 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 29 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 30 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 31 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 32 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 33 * SUCH DAMAGE. 34 */ 35 36#include "SYS.h" 37 38 .section .openbsd.randomdata,"aw",@progbits 39 .align 4 40.L__jmpxor 41 .zero 4*2 ; (r2/rp, r30/sp) 42 43/* 44 * C library -- setjmp, longjmp 45 * 46 * longjmp(a,v) 47 * will generate a "return(v)" from 48 * the last call to 49 * setjmp(a) 50 * by restoring registers from the stack, 51 * and a struct sigcontext, see <signal.h> 52 */ 53 54ENTRY(sigsetjmp, 64) 55 sub,<> %r0, %arg1, %r0 56 b .L_setjmp$dosaves 57 stw %arg1, 44(%arg0) ; last of reserved words 58 59ALTENTRY(setjmp) 60 copy %arg0, %arg2 ; save jmpbuf in %arg2 61 62 ldi 1, %arg0 ; how = SIG_BLOCK 63 copy %r0, %arg1 ; set = empty 64 stw %rp, HPPA_FRAME_ERP(%sr0,%sp) 65 ldil L%SYSCALLGATE, %r1 66 ble 4(%sr7, %r1) 67 ldi SYS_sigprocmask, %t1 68 ldw HPPA_FRAME_ERP(%sr0,%sp), %rp 69 70 copy %arg2, %arg0 ; restore jmpbuf to %arg0 71 stw %ret0, 4(%arg0) ; mask 72 73ALTENTRY(_setjmp) 74.L_setjmp$dosaves 75#ifdef __PIC__ 76 addil LT%.L__jmpxor, %r19 77 ldw RT%.L__jmpxor(%r1), %t2 78#else 79 ldil L%.L__jmpxor, %t1 80 ldo R%.L__jmpxor(%t1), %t2 81#endif 82 ldw 0(%t2), %t1 ; xor for r2/rp 83 ldw 4(%t2), %t2 ; xor for r30/sp, overwrite address 84 85 xor %sp, %t2, %t2 86 stw %t2, 12(%arg0) ; sc.sc_sp = %sp 87 xor %rp, %t1, %t1 88 stw %t1, 20(%arg0) ; sc.sc_pcoqh = %rp 89 copy %r0, %t1 90 copy %r0, %t2 91 92 /* We store all callee-saved registers after the sigcontext. */ 93 ldo 48(%arg0), %r1 ; offset to after sc 94 stwm %r3, 4(%r1) 95 stwm %r4, 4(%r1) 96 stwm %r5, 4(%r1) 97 stwm %r6, 4(%r1) 98 stwm %r7, 4(%r1) 99 stwm %r8, 4(%r1) 100 stwm %r9, 4(%r1) 101 stwm %r10, 4(%r1) 102 stwm %r11, 4(%r1) 103 stwm %r12, 4(%r1) 104 stwm %r13, 4(%r1) 105 stwm %r14, 4(%r1) 106 stwm %r15, 4(%r1) 107 stwm %r16, 4(%r1) 108 stwm %r17, 4(%r1) 109 stwm %r18, 4(%r1) 110 111 /* Return 0. */ 112 bv %r0(%rp) 113 copy %r0, %ret0 114EXIT(sigsetjmp) 115 .size _setjmp, . - _setjmp 116 .size setjmp, . - setjmp 117 118ENTRY(siglongjmp,64) 119 ldw 44(%arg0), %arg2 120 sub,<> %r0, %arg2, %r0 121 b .L_longjmp$restores 122 nop 123 124ALTENTRY(longjmp) 125 copy %arg1, %arg3 ; save val in %arg3 126 copy %arg0, %arg2 ; save jmpbuf in %arg2 127 128 ldw 4(%arg0), %arg1 ; set from jumpbuf 129 ldi 3, %arg0 ; how = SIG_SETMASK 130 stw %rp, HPPA_FRAME_ERP(%sr0,%sp) 131 ldil L%SYSCALLGATE, %r1 132 ble 4(%sr7, %r1) 133 ldi SYS_sigprocmask, %t1 134 ldw HPPA_FRAME_ERP(%sr0,%sp), %rp 135 136 copy %arg2, %arg0 ; restore jmpbuf to %arg0 137 copy %arg3, %arg1 ; restore val to %arg1 138 139ALTENTRY(_longjmp) 140.L_longjmp$restores 141 /* restore callee-saved registers */ 142 ldo 48(%arg0), %r1 143 ldwm 4(%r1), %r3 144 ldwm 4(%r1), %r4 145 ldwm 4(%r1), %r5 146 ldwm 4(%r1), %r6 147 ldwm 4(%r1), %r7 148 ldwm 4(%r1), %r8 149 ldwm 4(%r1), %r9 150 ldwm 4(%r1), %r10 151 ldwm 4(%r1), %r11 152 ldwm 4(%r1), %r12 153 ldwm 4(%r1), %r13 154 ldwm 4(%r1), %r14 155 ldwm 4(%r1), %r15 156 ldwm 4(%r1), %r16 157 ldwm 4(%r1), %r17 158 ldwm 4(%r1), %r18 159 160 /* restore the rest */ 161#ifdef __PIC__ 162 addil LT%.L__jmpxor, %r19 163 ldw RT%.L__jmpxor(%r1), %t2 164#else 165 ldil L%.L__jmpxor, t1 166 ldo R%.L__jmpxor(t1), t2 167#endif 168 ldw 0(t2), t1 ; xor for r2/rp 169 ldw 4(t2), t2 ; xor for r30/sp, overwrite address 170 171 ldw 12(%arg0), %r1 172 xor %r1, %t2, %sp 173 ldw 20(%arg0), %r1 174 xor %r1, %t1, %rp 175 copy %r0, %t1 ; overwrite the cookies 176 copy %r0, %t2 177 sub,<> %arg1, %r0, %r0 178 ldo 1(%arg1), %arg1 179 bv %r0(%rp) 180 copy %arg1, %ret0 181EXIT(siglongjmp) 182 .size _longjmp, . - _longjmp 183 .size longjmp, . - longjmp 184 185 .end 186