mirror of
https://sourceware.org/git/glibc.git
synced 2024-11-27 07:20:11 +00:00
103 lines
2.8 KiB
ArmAsm
103 lines
2.8 KiB
ArmAsm
/* Install given context.
|
|
Copyright (C) 2002-2015 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 __setcontext (const ucontext_t *ucp)
|
|
|
|
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 restore anything
|
|
other than the PRESERVED state. */
|
|
|
|
ENTRY(__setcontext)
|
|
/* Save argument since syscall will destroy it. */
|
|
pushq %rdi
|
|
cfi_adjust_cfa_offset(8)
|
|
|
|
/* Set the signal mask with
|
|
rt_sigprocmask (SIG_SETMASK, mask, NULL, _NSIG/8). */
|
|
leaq oSIGMASK(%rdi), %rsi
|
|
xorl %edx, %edx
|
|
movl $SIG_SETMASK, %edi
|
|
movl $_NSIG8,%r10d
|
|
movl $__NR_rt_sigprocmask, %eax
|
|
syscall
|
|
popq %rdi /* Reload %rdi, adjust stack. */
|
|
cfi_adjust_cfa_offset(-8)
|
|
cmpq $-4095, %rax /* Check %rax for error. */
|
|
jae SYSCALL_ERROR_LABEL /* Jump to error handler if error. */
|
|
|
|
/* Restore the floating-point context. Not the registers, only the
|
|
rest. */
|
|
movq oFPREGS(%rdi), %rcx
|
|
fldenv (%rcx)
|
|
ldmxcsr oMXCSR(%rdi)
|
|
|
|
|
|
/* Load the new stack pointer, the preserved registers and
|
|
registers used for passing args. */
|
|
cfi_def_cfa(%rdi, 0)
|
|
cfi_offset(%rbx,oRBX)
|
|
cfi_offset(%rbp,oRBP)
|
|
cfi_offset(%r12,oR12)
|
|
cfi_offset(%r13,oR13)
|
|
cfi_offset(%r14,oR14)
|
|
cfi_offset(%r15,oR15)
|
|
cfi_offset(%rsp,oRSP)
|
|
cfi_offset(%rip,oRIP)
|
|
|
|
movq oRSP(%rdi), %rsp
|
|
movq oRBX(%rdi), %rbx
|
|
movq oRBP(%rdi), %rbp
|
|
movq oR12(%rdi), %r12
|
|
movq oR13(%rdi), %r13
|
|
movq oR14(%rdi), %r14
|
|
movq oR15(%rdi), %r15
|
|
|
|
/* The following ret should return to the address set with
|
|
getcontext. Therefore push the address on the stack. */
|
|
movq oRIP(%rdi), %rcx
|
|
pushq %rcx
|
|
|
|
movq oRSI(%rdi), %rsi
|
|
movq oRDX(%rdi), %rdx
|
|
movq oRCX(%rdi), %rcx
|
|
movq oR8(%rdi), %r8
|
|
movq oR9(%rdi), %r9
|
|
|
|
/* Setup finally %rdi. */
|
|
movq oRDI(%rdi), %rdi
|
|
|
|
/* End FDE here, we fall into another context. */
|
|
cfi_endproc
|
|
cfi_startproc
|
|
|
|
/* Clear rax to indicate success. */
|
|
xorl %eax, %eax
|
|
ret
|
|
PSEUDO_END(__setcontext)
|
|
|
|
weak_alias (__setcontext, setcontext)
|