2019-12-29 15:04:51 +00:00
|
|
|
/* Save current context.
|
2020-01-01 00:14:33 +00:00
|
|
|
Copyright (C) 2001-2020 Free Software Foundation, Inc.
|
2019-12-29 15:04:51 +00:00
|
|
|
This file is part of the GNU C Library.
|
|
|
|
|
Contributed by Ulrich Drepper <drepper@redhat.com>, 2001.
|
|
|
|
|
|
|
|
|
|
The GNU C Library is free software; you can redistribute it and/or
|
|
|
|
|
modify it under the terms of the GNU Lesser General Public
|
|
|
|
|
License as published by the Free Software Foundation; either
|
|
|
|
|
version 2.1 of the License, or (at your option) any later version.
|
|
|
|
|
|
|
|
|
|
The GNU C Library is distributed in the hope that it will be useful,
|
|
|
|
|
but WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
|
|
|
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
|
|
|
|
|
Lesser General Public License for more details.
|
|
|
|
|
|
|
|
|
|
You should have received a copy of the GNU Lesser General Public
|
|
|
|
|
License along with the GNU C Library; if not, see
|
|
|
|
|
<https://www.gnu.org/licenses/>. */
|
|
|
|
|
|
|
|
|
|
#include <sysdep.h>
|
|
|
|
|
|
|
|
|
|
#include "ucontext_i.h"
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
ENTRY(__getcontext)
|
|
|
|
|
/* Load address of the context data structure. */
|
|
|
|
|
movl 4(%esp), %eax
|
|
|
|
|
|
|
|
|
|
/* Return value of getcontext. EAX is the only register whose
|
|
|
|
|
value is not preserved. */
|
|
|
|
|
movl $0, oEAX(%eax)
|
|
|
|
|
|
|
|
|
|
/* Save the 32-bit register values and the return address. */
|
|
|
|
|
movl %ecx, oECX(%eax)
|
|
|
|
|
movl %edx, oEDX(%eax)
|
|
|
|
|
movl %edi, oEDI(%eax)
|
|
|
|
|
movl %esi, oESI(%eax)
|
|
|
|
|
movl %ebp, oEBP(%eax)
|
|
|
|
|
movl (%esp), %ecx
|
|
|
|
|
movl %ecx, oEIP(%eax)
|
|
|
|
|
leal 4(%esp), %ecx /* Exclude the return address. */
|
|
|
|
|
movl %ecx, oESP(%eax)
|
|
|
|
|
movl %ebx, oEBX(%eax)
|
|
|
|
|
|
|
|
|
|
/* Save the FS segment register. We don't touch the GS register
|
|
|
|
|
since it is used for threads. */
|
|
|
|
|
xorl %edx, %edx
|
|
|
|
|
movw %fs, %dx
|
|
|
|
|
movl %edx, oFS(%eax)
|
|
|
|
|
|
|
|
|
|
leal oFPREGS(%eax), %ecx
|
|
|
|
|
/* Save the floating-point context. */
|
|
|
|
|
fnstenv (%ecx)
|
|
|
|
|
/* And load it right back since the processor changes the mask.
|
|
|
|
|
Intel thought this opcode to be used in interrupt handlers which
|
|
|
|
|
would block all exceptions. */
|
|
|
|
|
fldenv (%ecx)
|
|
|
|
|
|
|
|
|
|
/* Save the current signal mask. */
|
|
|
|
|
subl $12, %esp
|
|
|
|
|
cfi_adjust_cfa_offset (12)
|
|
|
|
|
leal oSIGMASK(%eax), %eax
|
|
|
|
|
movl %eax, 8(%esp)
|
|
|
|
|
movl $0, 4(%esp)
|
|
|
|
|
movl $SIG_BLOCK, (%esp)
|
|
|
|
|
call HIDDEN_JUMPTARGET (__sigprocmask)
|
|
|
|
|
addl $12, %esp
|
|
|
|
|
cfi_adjust_cfa_offset (-12)
|
|
|
|
|
/* Propagate %eax (and errno, in case). */
|
|
|
|
|
|
|
|
|
|
ret
|
|
|
|
|
PSEUDO_END(__getcontext)
|
|
|
|
|
|
|
|
|
|
weak_alias (__getcontext, getcontext)
|
