diff options
Diffstat (limited to 'sysdeps/unix/sysv/linux/x86_64/swapcontext.S')
| -rw-r--r-- | sysdeps/unix/sysv/linux/x86_64/swapcontext.S | 120 |
1 files changed, 0 insertions, 120 deletions
diff --git a/sysdeps/unix/sysv/linux/x86_64/swapcontext.S b/sysdeps/unix/sysv/linux/x86_64/swapcontext.S deleted file mode 100644 index 0e1f0b5cab..0000000000 --- a/sysdeps/unix/sysv/linux/x86_64/swapcontext.S +++ /dev/null @@ -1,120 +0,0 @@ -/* Save current context and install the given one. - Copyright (C) 2002-2017 Free Software Foundation, Inc. - This file is part of the GNU C Library. - Contributed by Andreas Jaeger <aj@suse.de>, 2002. - - 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" - - -/* int __swapcontext (ucontext_t *oucp, const ucontext_t *ucp); - - Saves the machine context in oucp such that when it is activated, - it appears as if __swapcontextt() returned again, restores the - machine context in ucp and thereby resumes execution in that - context. - - This implementation is intended to be used for *synchronous* context - switches only. Therefore, it does not have to save anything - other than the PRESERVED state. */ - -ENTRY(__swapcontext) - /* Save the preserved registers, the registers used for passing args, - and the return address. */ - movq %rbx, oRBX(%rdi) - movq %rbp, oRBP(%rdi) - movq %r12, oR12(%rdi) - movq %r13, oR13(%rdi) - movq %r14, oR14(%rdi) - movq %r15, oR15(%rdi) - - movq %rdi, oRDI(%rdi) - movq %rsi, oRSI(%rdi) - movq %rdx, oRDX(%rdi) - movq %rcx, oRCX(%rdi) - movq %r8, oR8(%rdi) - movq %r9, oR9(%rdi) - - movq (%rsp), %rcx - movq %rcx, oRIP(%rdi) - leaq 8(%rsp), %rcx /* Exclude the return address. */ - movq %rcx, oRSP(%rdi) - - /* We have separate floating-point register content memory on the - stack. We use the __fpregs_mem block in the context. Set the - links up correctly. */ - leaq oFPREGSMEM(%rdi), %rcx - movq %rcx, oFPREGS(%rdi) - /* Save the floating-point environment. */ - fnstenv (%rcx) - stmxcsr oMXCSR(%rdi) - - - /* The syscall destroys some registers, save them. */ - movq %rsi, %r12 - - /* Save the current signal mask and install the new one with - rt_sigprocmask (SIG_BLOCK, newset, oldset,_NSIG/8). */ - leaq oSIGMASK(%rdi), %rdx - leaq oSIGMASK(%rsi), %rsi - movl $SIG_SETMASK, %edi - movl $_NSIG8,%r10d - movl $__NR_rt_sigprocmask, %eax - syscall - cmpq $-4095, %rax /* Check %rax for error. */ - jae SYSCALL_ERROR_LABEL /* Jump to error handler if error. */ - - /* Restore destroyed registers. */ - movq %r12, %rsi - - /* Restore the floating-point context. Not the registers, only the - rest. */ - movq oFPREGS(%rsi), %rcx - fldenv (%rcx) - ldmxcsr oMXCSR(%rsi) - - /* Load the new stack pointer and the preserved registers. */ - movq oRSP(%rsi), %rsp - movq oRBX(%rsi), %rbx - movq oRBP(%rsi), %rbp - movq oR12(%rsi), %r12 - movq oR13(%rsi), %r13 - movq oR14(%rsi), %r14 - movq oR15(%rsi), %r15 - - /* The following ret should return to the address set with - getcontext. Therefore push the address on the stack. */ - movq oRIP(%rsi), %rcx - pushq %rcx - - /* Setup registers used for passing args. */ - movq oRDI(%rsi), %rdi - movq oRDX(%rsi), %rdx - movq oRCX(%rsi), %rcx - movq oR8(%rsi), %r8 - movq oR9(%rsi), %r9 - - /* Setup finally %rsi. */ - movq oRSI(%rsi), %rsi - - /* Clear rax to indicate success. */ - xorl %eax, %eax - ret -PSEUDO_END(__swapcontext) - -weak_alias (__swapcontext, swapcontext) |