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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.
80 lines
2.4 KiB
ArmAsm
80 lines
2.4 KiB
ArmAsm
/* Install given 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 __setcontext (const ucontext_t *ucp)
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Restores the machine context in UCP and thereby resumes execution
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in that context.
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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 restore anything
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other than the PRESERVED state. */
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ENTRY(__setcontext)
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/* Save argument since syscall will destroy it. */
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pushq %rdi
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/* Set the signal mask with
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rt_sigprocmask (SIG_SETMASK, mask, NULL, _NSIG/8). */
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leaq oSIGMASK(%rdi), %rsi
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xorq %rdx, %rdx
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movq $SIG_SETMASK, %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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popq %rdi /* Reload %rdi, adjust stack. */
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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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/* Restore the floating-point context. Not the registers, only the
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rest. */
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movq oFPREGS(%rdi), %rcx
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fldenv (%rcx)
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ldmxcsr oMXCSR(%rdi)
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/* Load the new stack pointer and the preserved registers. */
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movq oRSP(%rdi), %rsp
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movq oRBX(%rdi), %rbx
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movq oRBP(%rdi), %rbp
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movq oR12(%rdi), %r12
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movq oR13(%rdi), %r13
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movq oR14(%rdi), %r14
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movq oR15(%rdi), %r15
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/* The following ret should return to the address set with
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getcontext. Therefore push the address on the stack. */
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movq oRIP(%rdi), %rcx
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pushq %rcx
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/* Clear rax to indicate 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(__setcontext)
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weak_alias(__setcontext, setcontext)
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