src/ucontext/x86_64/_setcontext.s

   1 /*
   2  * Copyright (c) 2007,2009 Apple 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 #if defined(__x86_64__)
  25
  26 #include <architecture/i386/asm_help.h>
  27
  28 #define MCONTEXT_SS_RAX     16
  29 #define MCONTEXT_SS_RBX     24
  30 #define MCONTEXT_SS_RCX     32
  31 #define MCONTEXT_SS_RDX     40
  32 #define MCONTEXT_SS_RDI     48
  33 #define MCONTEXT_SS_RSI     56
  34 #define MCONTEXT_SS_RBP     64
  35 #define MCONTEXT_SS_RSP     72
  36 #define MCONTEXT_SS_R8      80
  37 #define MCONTEXT_SS_RIP     144
  38 #define MCONTEXT_SS_RFLAGS  152
  39
  40 TEXT
  41 .private_extern __setcontext
  42 LABEL(__setcontext)
  43         /* struct mcontext_t * %rdi */
  44 #if DEBUG
  45         movq  MCONTEXT_SS_RSI(%rdi),   %rsi
  46         movq  MCONTEXT_SS_RCX(%rdi),   %rcx
  47         movq  MCONTEXT_SS_R8+0(%rdi),  %r8
  48         movq  MCONTEXT_SS_R8+8(%rdi),  %r9
  49         movq  MCONTEXT_SS_R8+16(%rdi), %r10
  50         movq  MCONTEXT_SS_R8+24(%rdi), %r11
  51 #endif
  52         movq  MCONTEXT_SS_RBX(%rdi),   %rbx
  53         movq  MCONTEXT_SS_R8+32(%rdi), %r12
  54         movq  MCONTEXT_SS_R8+40(%rdi), %r13
  55         movq  MCONTEXT_SS_R8+48(%rdi), %r14
  56         movq  MCONTEXT_SS_R8+56(%rdi), %r15
  57
  58         movq  MCONTEXT_SS_RSP(%rdi), %rsp
  59         movq  MCONTEXT_SS_RBP(%rdi), %rbp
  60
  61         xorl  %eax, %eax        /* force x=getcontext(); ... setcontext(); to keep x==0 */
  62
  63 #if DEBUG
  64         movq  MCONTEXT_SS_RIP(%rdi), %rdx
  65         movq  MCONTEXT_SS_RDI(%rdi), %rdi
  66         jmp  *%rdx
  67 #else
  68         jmp  *MCONTEXT_SS_RIP(%rdi)
  69 #endif
  70
  71 #endif /* __x86_64__ */