1/* $OpenBSD: _setjmp.S,v 1.6 2016/05/09 16:33:48 guenther Exp $ */ 2/* $NetBSD: _setjmp.S,v 1.2 1996/10/17 03:08:03 cgd Exp $ */ 3 4/* 5 * Copyright (c) 1994, 1995 Carnegie-Mellon University. 6 * All rights reserved. 7 * 8 * Author: Chris G. Demetriou 9 * 10 * Permission to use, copy, modify and distribute this software and 11 * its documentation is hereby granted, provided that both the copyright 12 * notice and this permission notice appear in all copies of the 13 * software, derivative works or modified versions, and any portions 14 * thereof, and that both notices appear in supporting documentation. 15 * 16 * CARNEGIE MELLON ALLOWS FREE USE OF THIS SOFTWARE IN ITS "AS IS" 17 * CONDITION. CARNEGIE MELLON DISCLAIMS ANY LIABILITY OF ANY KIND 18 * FOR ANY DAMAGES WHATSOEVER RESULTING FROM THE USE OF THIS SOFTWARE. 19 * 20 * Carnegie Mellon requests users of this software to return to 21 * 22 * Software Distribution Coordinator or Software.Distribution@CS.CMU.EDU 23 * School of Computer Science 24 * Carnegie Mellon University 25 * Pittsburgh PA 15213-3890 26 * 27 * any improvements or extensions that they make and grant Carnegie the 28 * rights to redistribute these changes. 29 */ 30 31#include "SYS.h" 32 33/* 34 * C library -- _setjmp, _longjmp 35 * 36 * _longjmp(a,v) 37 * will generate a "return(v)" from 38 * the last call to 39 * _setjmp(a) 40 * by restoring registers from the stack, 41 * The previous signal state is NOT restored. 42 */ 43 44 .set noreorder 45 46LEAF(_setjmp, 1) 47 LDGP(pv) 48 stq ra, (2 * 8)(a0) /* sc_pc = return address */ 49 stq s0, (( 9 + 4) * 8)(a0) /* saved bits of sc_regs */ 50 stq s1, ((10 + 4) * 8)(a0) 51 stq s2, ((11 + 4) * 8)(a0) 52 stq s3, ((12 + 4) * 8)(a0) 53 stq s4, ((13 + 4) * 8)(a0) 54 stq s5, ((14 + 4) * 8)(a0) 55 stq s6, ((15 + 4) * 8)(a0) 56 stq ra, ((26 + 4) * 8)(a0) 57 stq sp, ((30 + 4) * 8)(a0) 58 ldiq t0, 0xacedbadd /* sigcontext magic number */ 59 stq t0, ((31 + 4) * 8)(a0) /* magic in sc_regs[31] */ 60 /* Too bad we can't check if we actually used FP */ 61 ldiq t0, 1 62 stq t0, (36 * 8)(a0) /* say we've used FP. */ 63 stt fs0, ((2 + 37) * 8)(a0) /* saved bits of sc_fpregs */ 64 stt fs1, ((3 + 37) * 8)(a0) 65 stt fs2, ((4 + 37) * 8)(a0) 66 stt fs3, ((5 + 37) * 8)(a0) 67 stt fs4, ((6 + 37) * 8)(a0) 68 stt fs5, ((7 + 37) * 8)(a0) 69 stt fs6, ((8 + 37) * 8)(a0) 70 stt fs7, ((9 + 37) * 8)(a0) 71 mf_fpcr ft0 /* get FP control reg */ 72 stt ft0, (69 * 8)(a0) /* and store it in sc_fpcr */ 73 stq zero, (70 * 8)(a0) /* FP software control XXX */ 74 stq zero, (71 * 8)(a0) /* sc_reserved[0] */ 75 stq zero, (72 * 8)(a0) /* sc_reserved[1] */ 76 stq zero, (73 * 8)(a0) /* sc_xxx[0] */ 77 stq zero, (74 * 8)(a0) /* sc_xxx[1] */ 78 stq zero, (75 * 8)(a0) /* sc_xxx[2] */ 79 stq zero, (76 * 8)(a0) /* sc_xxx[3] */ 80 stq zero, (77 * 8)(a0) /* sc_xxx[4] */ 81 stq zero, (78 * 8)(a0) /* sc_xxx[5] */ 82 stq zero, (79 * 8)(a0) /* sc_xxx[6] */ 83 stq zero, (80 * 8)(a0) /* sc_xxx[7] */ 84 85 mov zero, v0 /* return zero */ 86 RET 87END_STRONG(_setjmp) 88 89LEAF(_longjmp, 2) 90 LDGP(pv) 91 ldq t0, ((31 + 4) * 8)(a0) /* magic in sc_regs[31] */ 92 ldiq t1, 0xacedbadd 93 cmpeq t0, t1, t0 94 beq t0, botch /* If the magic was bad, punt */ 95 96 ldq ra, (2 * 8)(a0) /* sc_pc = return address */ 97 ldq s0, (( 9 + 4) * 8)(a0) /* saved bits of sc_regs */ 98 ldq s1, ((10 + 4) * 8)(a0) 99 ldq s2, ((11 + 4) * 8)(a0) 100 ldq s3, ((12 + 4) * 8)(a0) 101 ldq s4, ((13 + 4) * 8)(a0) 102 ldq s5, ((14 + 4) * 8)(a0) 103 ldq s6, ((15 + 4) * 8)(a0) 104 /* ldq ra, ((26 + 4) * 8)(a0) set above */ 105 ldq sp, ((30 + 4) * 8)(a0) 106 ldt fs0, ((2 + 37) * 8)(a0) /* saved bits of sc_fpregs */ 107 ldt fs1, ((3 + 37) * 8)(a0) 108 ldt fs2, ((4 + 37) * 8)(a0) 109 ldt fs3, ((5 + 37) * 8)(a0) 110 ldt fs4, ((6 + 37) * 8)(a0) 111 ldt fs5, ((7 + 37) * 8)(a0) 112 ldt fs6, ((8 + 37) * 8)(a0) 113 ldt fs7, ((9 + 37) * 8)(a0) 114 ldt ft0, (69 * 8)(a0) /* get sc_fpcr */ 115 mt_fpcr ft0 /* and restore it. */ 116 117 bne a1, 1f 118 addq a1, 1, a1 1191: 120 mov a1, v0 /* return second arg */ 121 RET 122 123botch: 124 CALL(_HIDDEN(abort)) 125 RET /* "can't" get here... */ 126END_STRONG(_longjmp) 127