3cf01adb39
2002-03-28 Andreas Jaeger <aj@suse.de> * sysdeps/unix/sysv/linux/x86_64/swapcontext.S: New. * sysdeps/unix/sysv/linux/x86_64/getcontext.S: New. * sysdeps/unix/sysv/linux/x86_64/setcontext.S: New. * sysdeps/unix/sysv/linux/x86_64/ucontext_i.h: New.
77 lines
2.4 KiB
ArmAsm
77 lines
2.4 KiB
ArmAsm
/* Save current context.
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Copyright (C) 2002 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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Contributed by Andreas Jaeger <aj@suse.de>, 2002.
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The GNU C Library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Lesser General Public
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License as published by the Free Software Foundation; either
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version 2.1 of the License, or (at your option) any later version.
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The GNU C Library is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public
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License along with the GNU C Library; if not, write to the Free
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Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
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02111-1307 USA. */
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#include <sysdep.h>
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#include "ucontext_i.h"
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/* int __getcontext (ucontext_t *ucp)
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Saves the machine context in UCP such that when it is activated,
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it appears as if __getcontext() returned again.
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This implementation is intended to be used for *synchronous* context
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switches only. Therefore, it does not have to save anything
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other than the PRESERVED state. */
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ENTRY(__getcontext)
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/* Save the preserved registers and the return address. */
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movq %rbx, oRBX(%rdi)
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movq %rbp, oRBP(%rdi)
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movq %r12, oR12(%rdi)
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movq %r13, oR13(%rdi)
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movq %r14, oR14(%rdi)
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movq %r15, oR15(%rdi)
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movq (%rsp), %rcx
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movq %rcx, oRIP(%rdi)
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leaq 8(%rsp), %rcx /* Exclude the return address. */
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movq %rcx, oRSP(%rdi)
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/* We have separate floating-point register content memory on the
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stack. We use the __fpregs_mem block in the context. Set the
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links up correctly. */
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leaq oFPREGSMEM(%rdi), %rcx
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movq %rcx, oFPREGS(%rdi)
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/* Save the floating-point environment. */
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fnstenv (%rcx)
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stmxcsr oMXCSR(%rdi)
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/* Save the current signal mask with
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rt_sigprocmask (SIG_BLOCK, NULL, set,_NSIG/8). */
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leaq oSIGMASK(%rdi), %rdx
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xorq %rsi,%rsi
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movq $SIG_BLOCK, %rdi
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movq $_NSIG8,%r10
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movq $__NR_rt_sigprocmask, %rax
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syscall
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cmpq $-4095, %rax /* Check %rax for error. */
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jae SYSCALL_ERROR_LABEL /* Jump to error handler if error. */
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/* All done, return 0 for success. */
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xorq %rax, %rax
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L(pseudo_end):
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ret
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PSEUDO_END(__getcontext)
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weak_alias(__getcontext, getcontext)
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