1 /* Install given context.
2 Copyright (C) 2001, 2002, 2003 Free Software Foundation, Inc.
3 This file is part of the GNU C Library.
4 Contributed by Ulrich Drepper <drepper@redhat.com>, 2001.
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.
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.
16 You should have received a copy of the GNU Lesser General Public
17 License along with the GNU C Library; if not, write to the Free
18 Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
23 #include "ucontext_i.h"
27 /* Load address of the context data structure. */
30 /* Get the current signal mask. Note that we preserve EBX in case
31 the system call fails and we return from the function with an
35 leal oSIGMASK(%eax), %ecx
36 movl $SIG_SETMASK, %ebx
37 movl $__NR_sigprocmask, %eax
40 cmpl $-4095, %eax /* Check %eax for error. */
41 jae SYSCALL_ERROR_LABEL /* Jump to error handler if error. */
43 /* EAX was modified, reload it. */
46 /* Restore the floating-point context. Not the registers, only the
48 movl oFPREGS(%eax), %ecx
51 /* Restore the FS segment register. We don't touch the GS register
52 since it is used for threads. */
56 /* Fetch the address to return to. */
59 /* Load the new stack pointer. */
62 /* Push the return address on the new stack so we can return there. */
65 /* Load the values of all the 32-bit registers (except ESP).
66 Since we are loading from EAX, it must be last. */
75 /* The following 'ret' will pop the address of the code and jump
80 PSEUDO_END(__setcontext)
82 weak_alias(__setcontext, setcontext)