1 /* Install given context.
2 Copyright (C) 2001-2024 Free Software Foundation, Inc.
3 This file is part of the GNU C Library.
5 The GNU C Library is free software; you can redistribute it and/or
6 modify it under the terms of the GNU Lesser General Public
7 License as published by the Free Software Foundation; either
8 version 2.1 of the License, or (at your option) any later version.
10 The GNU C Library is distributed in the hope that it will be useful,
11 but WITHOUT ANY WARRANTY; without even the implied warranty of
12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
13 Lesser General Public License for more details.
15 You should have received a copy of the GNU Lesser General Public
16 License along with the GNU C Library; if not, see
17 <https://www.gnu.org/licenses/>. */
21 #include "ucontext_i.h"
25 /* Load address of the context data structure. */
28 /* Get the current signal mask. Note that we preserve EBX in case
29 the system call fails and we return from the function with an
32 cfi_adjust_cfa_offset (4)
34 leal oSIGMASK(%eax), %ecx
35 movl $SIG_SETMASK, %ebx
36 cfi_rel_offset (ebx, 0)
37 movl $__NR_sigprocmask, %eax
40 cfi_adjust_cfa_offset (-4)
42 cmpl $-4095, %eax /* Check %eax for error. */
43 jae SYSCALL_ERROR_LABEL /* Jump to error handler if error. */
45 /* EAX was modified, reload it. */
48 /* Restore the floating-point context. Not the registers, only the
50 movl oFPREGS(%eax), %ecx
53 /* Restore the FS segment register. We don't touch the GS register
54 since it is used for threads. */
58 /* Fetch the address to return to. */
61 /* Load the new stack pointer. */
63 cfi_offset (edi, oEDI)
64 cfi_offset (esi, oESI)
65 cfi_offset (ebp, oEBP)
66 cfi_offset (ebx, oEBX)
69 /* Push the return address on the new stack so we can return there. */
72 /* Load the values of all the preserved registers (except ESP). */
78 /* All done, return 0 for success. */
81 /* End FDE here, we fall into another context. */
85 /* The following 'ret' will pop the address of the code and jump
89 PSEUDO_END(__setcontext)
90 libc_hidden_def (__setcontext)
92 weak_alias (__setcontext, setcontext)