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45 lines
1.3 KiB
ArmAsm
45 lines
1.3 KiB
ArmAsm
/* Copyright (C) 2005-2020 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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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 License as
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published by the Free Software Foundation; either version 2.1 of the
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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, see
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<https://www.gnu.org/licenses/>. */
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#include <sysdep.h>
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/* syscall (int nr, ...)
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AArch64 system calls take between 0 and 7 arguments. On entry here nr
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is in w0 and any other system call arguments are in register x1..x7.
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For kernel entry we need to move the system call nr to x8 then
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load the remaining arguments to register. */
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ENTRY (syscall)
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uxtw x8, w0
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mov x0, x1
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mov x1, x2
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mov x2, x3
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mov x3, x4
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mov x4, x5
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mov x5, x6
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mov x6, x7
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svc 0x0
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cmn x0, #4095
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b.cs 1f
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RET
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1:
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b SYSCALL_ERROR
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PSEUDO_END (syscall)
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