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/* Cancellable syscall wrapper. Linux/x86_64 version.
Copyright (C) 2023 Free Software Foundation, Inc.
This file is part of the GNU C Library.
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 <descr-const.h>
/* long int [rax] __syscall_cancel_arch (volatile int *cancelhandling [%rdi],
__syscall_arg_t nr [%rsi],
__syscall_arg_t arg1 [%rdx],
__syscall_arg_t arg2 [%rcx],
__syscall_arg_t arg3 [%r8],
__syscall_arg_t arg4 [%r9],
__syscall_arg_t arg5 [SP+8],
__syscall_arg_t arg6 [SP+16]) */
ENTRY (__syscall_cancel_arch)
.globl __syscall_cancel_arch_start
__syscall_cancel_arch_start:
/* if (*cancelhandling & CANCELED_BITMASK)
__syscall_do_cancel() */
mov (%rdi),%eax
testb $TCB_CANCELED_BITMASK, (%rdi)
jne __syscall_do_cancel
/* Issue a 6 argument syscall, the nr [%rax] being the syscall
number. */
mov %rdi,%r11
mov %rsi,%rax
mov %rdx,%rdi
mov %rcx,%rsi
mov %r8,%rdx
mov %r9,%r10
mov 8(%rsp),%r8
mov 16(%rsp),%r9
mov %r11,8(%rsp)
syscall
.globl __syscall_cancel_arch_end
__syscall_cancel_arch_end:
ret
END (__syscall_cancel_arch)
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