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Diffstat (limited to 'sysdeps/mach/hurd/i386/getcontext.S')
-rw-r--r--sysdeps/mach/hurd/i386/getcontext.S74
1 files changed, 74 insertions, 0 deletions
diff --git a/sysdeps/mach/hurd/i386/getcontext.S b/sysdeps/mach/hurd/i386/getcontext.S
new file mode 100644
index 0000000000..e71f3bc645
--- /dev/null
+++ b/sysdeps/mach/hurd/i386/getcontext.S
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+/* Save current context.
+ Copyright (C) 2001-2015 Free Software Foundation, Inc.
+ 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
+ <http://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)