1/* $OpenBSD: setjmp.S,v 1.12 2023/12/10 16:45:51 deraadt 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$dosaves 57 stw %arg1, 44(%arg0) ; last of reserved words 58 59ALTENTRY(setjmp) 60 copy %arg0, %arg2 ; save jmpbuf in %arg2 61 62 ldi 1, %arg0 ; how = SIG_BLOCK 63 copy %r0, %arg1 ; set = empty 64 stw %rp, HPPA_FRAME_ERP(%sr0,%sp) 65 ldil L%SYSCALLGATE, %r1 6699: ble 4(%sr7, %r1) 67 PINSYSCALL(SYS_sigprocmask, 99b) 68 ldi SYS_sigprocmask, %t1 69 ldw HPPA_FRAME_ERP(%sr0,%sp), %rp 70 71 copy %arg2, %arg0 ; restore jmpbuf to %arg0 72 stw %ret0, 4(%arg0) ; mask 73 74ALTENTRY(_setjmp) 75.L_setjmp$dosaves 76#ifdef __PIC__ 77 addil LT%.L__jmpxor, %r19 78 ldw RT%.L__jmpxor(%r1), %t2 79#else 80 ldil L%.L__jmpxor, %t1 81 ldo R%.L__jmpxor(%t1), %t2 82#endif 83 ldw 0(%t2), %t1 ; xor for r2/rp 84 ldw 4(%t2), %t2 ; xor for r30/sp, overwrite address 85 86 xor %sp, %t2, %t2 87 stw %t2, 12(%arg0) ; sc.sc_sp = %sp 88 xor %rp, %t1, %t1 89 stw %t1, 20(%arg0) ; sc.sc_pcoqh = %rp 90 copy %r0, %t1 91 copy %r0, %t2 92 93 /* We store all callee-saved registers after the sigcontext. */ 94 ldo 48(%arg0), %r1 ; offset to after sc 95 stwm %r3, 4(%r1) 96 stwm %r4, 4(%r1) 97 stwm %r5, 4(%r1) 98 stwm %r6, 4(%r1) 99 stwm %r7, 4(%r1) 100 stwm %r8, 4(%r1) 101 stwm %r9, 4(%r1) 102 stwm %r10, 4(%r1) 103 stwm %r11, 4(%r1) 104 stwm %r12, 4(%r1) 105 stwm %r13, 4(%r1) 106 stwm %r14, 4(%r1) 107 stwm %r15, 4(%r1) 108 stwm %r16, 4(%r1) 109 stwm %r17, 4(%r1) 110 stwm %r18, 4(%r1) 111 112 /* Return 0. */ 113 bv %r0(%rp) 114 copy %r0, %ret0 115EXIT(sigsetjmp) 116 .size _setjmp, . - _setjmp 117 .size setjmp, . - setjmp 118 119ENTRY(siglongjmp,64) 120 ldw 44(%arg0), %arg2 121 sub,<> %r0, %arg2, %r0 122 b .L_longjmp$restores 123 nop 124 125ALTENTRY(longjmp) 126 copy %arg1, %arg3 ; save val in %arg3 127 copy %arg0, %arg2 ; save jmpbuf in %arg2 128 129 ldw 4(%arg0), %arg1 ; set from jumpbuf 130 ldi 3, %arg0 ; how = SIG_SETMASK 131 stw %rp, HPPA_FRAME_ERP(%sr0,%sp) 132 ldil L%SYSCALLGATE, %r1 13398: ble 4(%sr7, %r1) 134 PINSYSCALL(SYS_sigprocmask, 98b) 135 ldi SYS_sigprocmask, %t1 136 ldw HPPA_FRAME_ERP(%sr0,%sp), %rp 137 138 copy %arg2, %arg0 ; restore jmpbuf to %arg0 139 copy %arg3, %arg1 ; restore val to %arg1 140 141ALTENTRY(_longjmp) 142.L_longjmp$restores 143 /* restore callee-saved registers */ 144 ldo 48(%arg0), %r1 145 ldwm 4(%r1), %r3 146 ldwm 4(%r1), %r4 147 ldwm 4(%r1), %r5 148 ldwm 4(%r1), %r6 149 ldwm 4(%r1), %r7 150 ldwm 4(%r1), %r8 151 ldwm 4(%r1), %r9 152 ldwm 4(%r1), %r10 153 ldwm 4(%r1), %r11 154 ldwm 4(%r1), %r12 155 ldwm 4(%r1), %r13 156 ldwm 4(%r1), %r14 157 ldwm 4(%r1), %r15 158 ldwm 4(%r1), %r16 159 ldwm 4(%r1), %r17 160 ldwm 4(%r1), %r18 161 162 /* restore the rest */ 163#ifdef __PIC__ 164 addil LT%.L__jmpxor, %r19 165 ldw RT%.L__jmpxor(%r1), %t2 166#else 167 ldil L%.L__jmpxor, t1 168 ldo R%.L__jmpxor(t1), t2 169#endif 170 ldw 0(t2), t1 ; xor for r2/rp 171 ldw 4(t2), t2 ; xor for r30/sp, overwrite address 172 173 ldw 12(%arg0), %r1 174 xor %r1, %t2, %sp 175 ldw 20(%arg0), %r1 176 xor %r1, %t1, %rp 177 copy %r0, %t1 ; overwrite the cookies 178 copy %r0, %t2 179 sub,<> %arg1, %r0, %r0 180 ldo 1(%arg1), %arg1 181 bv %r0(%rp) 182 copy %arg1, %ret0 183EXIT(siglongjmp) 184 .size _longjmp, . - _longjmp 185 .size longjmp, . - longjmp 186 187 .end 188