1/* $NetBSD: compat_setjmp.S,v 1.2 2014/01/23 03:08:50 christos Exp $ */ 2 3/* 4 * Copyright (c) 1994, 1995 Carnegie-Mellon University. 5 * All rights reserved. 6 * 7 * Author: Chris G. Demetriou 8 * 9 * Permission to use, copy, modify and distribute this software and 10 * its documentation is hereby granted, provided that both the copyright 11 * notice and this permission notice appear in all copies of the 12 * software, derivative works or modified versions, and any portions 13 * thereof, and that both notices appear in supporting documentation. 14 * 15 * CARNEGIE MELLON ALLOWS FREE USE OF THIS SOFTWARE IN ITS "AS IS" 16 * CONDITION. CARNEGIE MELLON DISCLAIMS ANY LIABILITY OF ANY KIND 17 * FOR ANY DAMAGES WHATSOEVER RESULTING FROM THE USE OF THIS SOFTWARE. 18 * 19 * Carnegie Mellon requests users of this software to return to 20 * 21 * Software Distribution Coordinator or Software.Distribution@CS.CMU.EDU 22 * School of Computer Science 23 * Carnegie Mellon University 24 * Pittsburgh PA 15213-3890 25 * 26 * any improvements or extensions that they make and grant Carnegie the 27 * rights to redistribute these changes. 28 */ 29 30#include <machine/asm.h> 31 32/* 33 * C library -- setjmp, longjmp 34 * 35 * longjmp(a,v) 36 * will generate a "return(v)" from 37 * the last call to 38 * setjmp(a) 39 * by restoring registers from the stack, 40 * and the previous signal state. 41 */ 42 43 .set noreorder 44 45LEAF(setjmp, 1) 46 LDGP(pv) 47 stq ra, (2 * 8)(a0) /* sc_pc = return address */ 48 stq s0, (( 9 + 4) * 8)(a0) /* saved bits of sc_regs */ 49 stq s1, ((10 + 4) * 8)(a0) 50 stq s2, ((11 + 4) * 8)(a0) 51 stq s3, ((12 + 4) * 8)(a0) 52 stq s4, ((13 + 4) * 8)(a0) 53 stq s5, ((14 + 4) * 8)(a0) 54 stq s6, ((15 + 4) * 8)(a0) 55 stq ra, ((26 + 4) * 8)(a0) 56 stq sp, ((30 + 4) * 8)(a0) 57 58 /* 59 * get signal information 60 */ 61 mov a0, s0 /* squirrel away ptr to sc */ 62 63 /* see what's blocked */ 64 mov zero, a0 65 CALL(sigblock) /* see what's blocked */ 66 stq v0, (1 * 8)(s0) /* and remember it in sc_mask */ 67 68 lda sp, -24(sp) /* sizeof struct sigaltstack */ 69 mov zero, a0 70 mov sp, a1 71 CALL(__sigaltstack14) 72 ldl t0, 16(sp) /* offset of ss_flags */ 73 lda sp, 24(sp) /* sizeof struct sigaltstack */ 74 ldq ra, ((26 + 4) * 8)(s0) /* restore return address */ 75 blt v0, botch /* check for error */ 76 and t0, 0x1, t0 /* get SA_ONSTACK flag */ 77 stq t0, (0 * 8)(s0) /* and save it in sc_onstack */ 78 /* 79 * Restore old s0 and a0, and continue saving registers 80 */ 81 mov s0, a0 82 ldq s0, (( 9 + 4) * 8)(a0) 83 84 ldq t0, magic /* sigcontext magic number */ 85 stq t0, ((31 + 4) * 8)(a0) /* magic in sc_regs[31] */ 86 /* Too bad we can't check if we actually used FP */ 87 ldiq t0, 1 88 stq t0, (36 * 8)(a0) /* say we've used FP. */ 89 stt fs0, ((2 + 37) * 8)(a0) /* saved bits of sc_fpregs */ 90 stt fs1, ((3 + 37) * 8)(a0) 91 stt fs2, ((4 + 37) * 8)(a0) 92 stt fs3, ((5 + 37) * 8)(a0) 93 stt fs4, ((6 + 37) * 8)(a0) 94 stt fs5, ((7 + 37) * 8)(a0) 95 stt fs6, ((8 + 37) * 8)(a0) 96 stt fs7, ((9 + 37) * 8)(a0) 97 mf_fpcr ft0 /* get FP control reg */ 98 stt ft0, (69 * 8)(a0) /* and store it in sc_fpcr */ 99 stq zero, (70 * 8)(a0) /* FP software control XXX */ 100 stq zero, (71 * 8)(a0) /* sc_reserved[0] */ 101 stq zero, (72 * 8)(a0) /* sc_reserved[1] */ 102 stq zero, (73 * 8)(a0) /* sc_xxx[0] */ 103 stq zero, (74 * 8)(a0) /* sc_xxx[1] */ 104 stq zero, (75 * 8)(a0) /* sc_xxx[2] */ 105 stq zero, (76 * 8)(a0) /* sc_xxx[3] */ 106 stq zero, (77 * 8)(a0) /* sc_xxx[4] */ 107 stq zero, (78 * 8)(a0) /* sc_xxx[5] */ 108 stq zero, (79 * 8)(a0) /* sc_xxx[6] */ 109 stq zero, (80 * 8)(a0) /* sc_xxx[7] */ 110 111 mov zero, v0 /* return zero */ 112 RET 113END(setjmp) 114 115LEAF(longjmp, 2) 116 LDGP(pv) 117 stq a1, (( 0 + 4) * 8)(a0) /* save return value */ 118 CALL(sigreturn) /* use sigreturn to return */ 119 120botch: 121 CALL(longjmperror) 122 CALL(abort) 123 RET /* "can't" get here... */ 124magic: 125 .quad 0xacedbade /* sigcontext magic number */ 126END(longjmp) 127