1/* 2 * Copyright (c) 1999-2016 Apple Computer, Inc. All rights reserved. 3 * 4 * @APPLE_LICENSE_HEADER_START@ 5 * 6 * This file contains Original Code and/or Modifications of Original Code 7 * as defined in and that are subject to the Apple Public Source License 8 * Version 2.0 (the 'License'). You may not use this file except in 9 * compliance with the License. Please obtain a copy of the License at 10 * http://www.opensource.apple.com/apsl/ and read it before using this 11 * file. 12 * 13 * The Original Code and all software distributed under the License are 14 * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER 15 * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES, 16 * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY, 17 * FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT. 18 * Please see the License for the specific language governing rights and 19 * limitations under the License. 20 * 21 * @APPLE_LICENSE_HEADER_END@ 22 */ 23/* 24 * Copyright (c) 1995 NeXT Computer, Inc. All Rights Reserved 25 * 26 * HISTORY 27 * 20-Apr-92 Bruce Martin ([email protected]) 28 * Created from M68K sources. 29 */ 30 31/* 32 * C library -- _setjmp, _longjmp 33 * 34 * _longjmp(a,v) 35 * will generate a "return(v)" from 36 * the last call to 37 * _setjmp(a) 38 * by restoring registers from the stack, 39 * The previous signal state is NOT restored. 40 * 41 */ 42 43#include <architecture/i386/asm_help.h> 44 45#define JB_RBX 0 46#define JB_RBP 8 47#define JB_RSP 16 48#define JB_R12 24 49#define JB_R13 32 50#define JB_R14 40 51#define JB_R15 48 52#define JB_RIP 56 53#define JB_RFLAGS 64 54#define JB_MXCSR 72 55#define JB_FPCONTROL 76 56#define JB_MASK 80 57 58LEAF(__setjmp, 0) 59 // %rdi is a jmp_buf (struct sigcontext *) 60 61 // now build sigcontext 62 movq %rbx, JB_RBX(%rdi) 63 movq %rbp, JB_RBP(%rdi) 64 movq %r12, JB_R12(%rdi) 65 movq %r13, JB_R13(%rdi) 66 movq %r14, JB_R14(%rdi) 67 movq %r15, JB_R15(%rdi) 68 69 // RIP is set to the frame return address value 70 movq (%rsp), %rax 71 movq %rax, JB_RIP(%rdi) 72 // RSP is set to the frame return address plus 8 73 leaq 8(%rsp), %rax 74 movq %rax, JB_RSP(%rdi) 75 76 // save fp control word 77 fnstcw JB_FPCONTROL(%rdi) 78 79 // save MXCSR 80 stmxcsr JB_MXCSR(%rdi) 81 82 // return 0 83 xorl %eax, %eax 84 ret 85 UNWIND_EPILOGUE 86 87 88LEAF(__longjmp, 0) 89 fninit // Clear all FP exceptions 90 // %rdi is a jmp_buf (struct sigcontext *) 91 // %esi is the return value 92 movl %esi, %eax 93 testl %esi, %esi 94 jnz 1f 95 incl %eax 96 97 // general registers 981: 99 movq JB_RBX(%rdi), %rbx 100 movq JB_RBP(%rdi), %rbp 101 movq JB_RSP(%rdi), %rsp 102 movq JB_R12(%rdi), %r12 103 movq JB_R13(%rdi), %r13 104 movq JB_R14(%rdi), %r14 105 movq JB_R15(%rdi), %r15 106 107 // restore FP control word 108 fldcw JB_FPCONTROL(%rdi) 109 110 // restore MXCSR 111 ldmxcsr JB_MXCSR(%rdi) 112 113 114 // Make sure DF is reset 115 cld 116 117 jmp *JB_RIP(%rdi) 118 UNWIND_EPILOGUE 119