]>
Commit | Line | Data |
---|---|---|
3cf01adb | 1 | /* Install given 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 | ||
25 | /* int __setcontext (const ucontext_t *ucp) | |
26 | ||
27 | Restores the machine context in UCP and thereby resumes execution | |
28 | in that context. | |
29 | ||
30 | This implementation is intended to be used for *synchronous* context | |
31 | switches only. Therefore, it does not have to restore anything | |
32 | other than the PRESERVED state. */ | |
33 | ||
34 | ENTRY(__setcontext) | |
35 | /* Save argument since syscall will destroy it. */ | |
36 | pushq %rdi | |
4ef09295 | 37 | cfi_adjust_cfa_offset(8) |
3cf01adb AJ |
38 | |
39 | /* Set the signal mask with | |
40 | rt_sigprocmask (SIG_SETMASK, mask, NULL, _NSIG/8). */ | |
41 | leaq oSIGMASK(%rdi), %rsi | |
ee618985 UD |
42 | xorl %edx, %edx |
43 | movl $SIG_SETMASK, %edi | |
44 | movl $_NSIG8,%r10d | |
45 | movl $__NR_rt_sigprocmask, %eax | |
3cf01adb AJ |
46 | syscall |
47 | popq %rdi /* Reload %rdi, adjust stack. */ | |
4ef09295 | 48 | cfi_adjust_cfa_offset(-8) |
3cf01adb AJ |
49 | cmpq $-4095, %rax /* Check %rax for error. */ |
50 | jae SYSCALL_ERROR_LABEL /* Jump to error handler if error. */ | |
51 | ||
52 | /* Restore the floating-point context. Not the registers, only the | |
53 | rest. */ | |
54 | movq oFPREGS(%rdi), %rcx | |
55 | fldenv (%rcx) | |
56 | ldmxcsr oMXCSR(%rdi) | |
57 | ||
58 | ||
c816e074 AJ |
59 | /* Load the new stack pointer, the preserved registers and |
60 | registers used for passing args. */ | |
4ef09295 AJ |
61 | cfi_def_cfa(%rdi, 0) |
62 | cfi_offset(%rbx,oRBX) | |
63 | cfi_offset(%rbp,oRBP) | |
64 | cfi_offset(%r12,oR12) | |
65 | cfi_offset(%r13,oR13) | |
66 | cfi_offset(%r14,oR14) | |
67 | cfi_offset(%r15,oR15) | |
68 | cfi_offset(%rsp,oRSP) | |
69 | cfi_offset(%rip,oRIP) | |
70 | ||
3cf01adb AJ |
71 | movq oRSP(%rdi), %rsp |
72 | movq oRBX(%rdi), %rbx | |
73 | movq oRBP(%rdi), %rbp | |
74 | movq oR12(%rdi), %r12 | |
75 | movq oR13(%rdi), %r13 | |
76 | movq oR14(%rdi), %r14 | |
77 | movq oR15(%rdi), %r15 | |
78 | ||
79 | /* The following ret should return to the address set with | |
80 | getcontext. Therefore push the address on the stack. */ | |
81 | movq oRIP(%rdi), %rcx | |
82 | pushq %rcx | |
83 | ||
c816e074 AJ |
84 | movq oRSI(%rdi), %rsi |
85 | movq oRDX(%rdi), %rdx | |
86 | movq oRCX(%rdi), %rcx | |
87 | movq oR8(%rdi), %r8 | |
88 | movq oR9(%rdi), %r9 | |
89 | ||
90 | /* Setup finally %rdi. */ | |
91 | movq oRDI(%rdi), %rdi | |
92 | ||
4ef09295 AJ |
93 | /* End FDE here, we fall into another context. */ |
94 | cfi_endproc | |
95 | cfi_startproc | |
96 | ||
3cf01adb | 97 | /* Clear rax to indicate success. */ |
ee618985 | 98 | xorl %eax, %eax |
3cf01adb AJ |
99 | ret |
100 | PSEUDO_END(__setcontext) | |
101 | ||
1ab18a5b | 102 | weak_alias (__setcontext, setcontext) |