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3cf01adb | 1 | /* Save current context. |
b168057a | 2 | Copyright (C) 2002-2015 Free Software Foundation, Inc. |
3cf01adb AJ |
3 | This file is part of the GNU C Library. |
4 | Contributed by Andreas Jaeger <aj@suse.de>, 2002. | |
5 | ||
6 | The GNU C Library is free software; you can redistribute it and/or | |
7 | modify it under the terms of the GNU Lesser General Public | |
8 | License as published by the Free Software Foundation; either | |
9 | version 2.1 of the License, or (at your option) any later version. | |
10 | ||
11 | The GNU C Library is distributed in the hope that it will be useful, | |
12 | but WITHOUT ANY WARRANTY; without even the implied warranty of | |
13 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
14 | Lesser General Public License for more details. | |
15 | ||
16 | You should have received a copy of the GNU Lesser General Public | |
59ba27a6 PE |
17 | License along with the GNU C Library; if not, see |
18 | <http://www.gnu.org/licenses/>. */ | |
3cf01adb AJ |
19 | |
20 | #include <sysdep.h> | |
21 | ||
22 | #include "ucontext_i.h" | |
23 | ||
24 | /* int __getcontext (ucontext_t *ucp) | |
25 | ||
26 | Saves the machine context in UCP such that when it is activated, | |
27 | it appears as if __getcontext() returned again. | |
28 | ||
29 | This implementation is intended to be used for *synchronous* context | |
30 | switches only. Therefore, it does not have to save anything | |
31 | other than the PRESERVED state. */ | |
32 | ||
33 | ||
34 | ENTRY(__getcontext) | |
c816e074 AJ |
35 | /* Save the preserved registers, the registers used for passing |
36 | args, and the return address. */ | |
3cf01adb AJ |
37 | movq %rbx, oRBX(%rdi) |
38 | movq %rbp, oRBP(%rdi) | |
39 | movq %r12, oR12(%rdi) | |
40 | movq %r13, oR13(%rdi) | |
41 | movq %r14, oR14(%rdi) | |
42 | movq %r15, oR15(%rdi) | |
43 | ||
c816e074 AJ |
44 | movq %rdi, oRDI(%rdi) |
45 | movq %rsi, oRSI(%rdi) | |
46 | movq %rdx, oRDX(%rdi) | |
47 | movq %rcx, oRCX(%rdi) | |
48 | movq %r8, oR8(%rdi) | |
49 | movq %r9, oR9(%rdi) | |
50 | ||
3cf01adb AJ |
51 | movq (%rsp), %rcx |
52 | movq %rcx, oRIP(%rdi) | |
53 | leaq 8(%rsp), %rcx /* Exclude the return address. */ | |
54 | movq %rcx, oRSP(%rdi) | |
55 | ||
56 | /* We have separate floating-point register content memory on the | |
57 | stack. We use the __fpregs_mem block in the context. Set the | |
58 | links up correctly. */ | |
59 | ||
60 | leaq oFPREGSMEM(%rdi), %rcx | |
61 | movq %rcx, oFPREGS(%rdi) | |
62 | /* Save the floating-point environment. */ | |
63 | fnstenv (%rcx) | |
75ea32ab | 64 | fldenv (%rcx) |
3cf01adb AJ |
65 | stmxcsr oMXCSR(%rdi) |
66 | ||
67 | /* Save the current signal mask with | |
68 | rt_sigprocmask (SIG_BLOCK, NULL, set,_NSIG/8). */ | |
69 | leaq oSIGMASK(%rdi), %rdx | |
ee618985 UD |
70 | xorl %esi,%esi |
71 | #if SIG_BLOCK == 0 | |
72 | xorl %edi, %edi | |
73 | #else | |
74 | movl $SIG_BLOCK, %edi | |
75 | #endif | |
76 | movl $_NSIG8,%r10d | |
77 | movl $__NR_rt_sigprocmask, %eax | |
3cf01adb AJ |
78 | syscall |
79 | cmpq $-4095, %rax /* Check %rax for error. */ | |
80 | jae SYSCALL_ERROR_LABEL /* Jump to error handler if error. */ | |
81 | ||
82 | /* All done, return 0 for success. */ | |
ee618985 | 83 | xorl %eax, %eax |
3cf01adb AJ |
84 | ret |
85 | PSEUDO_END(__getcontext) | |
86 | ||
1ab18a5b | 87 | weak_alias (__getcontext, getcontext) |