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72 lines
2.6 KiB
ArmAsm
72 lines
2.6 KiB
ArmAsm
/* $NetBSD: __syscall.S,v 1.1 2014/08/10 05:47:37 matt Exp $ */
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/*-
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* Copyright (c) 2014 The NetBSD Foundation, Inc.
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* All rights reserved.
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*
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* This code is derived from software contributed to The NetBSD Foundation
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* by Matt Thomas of 3am Software Foundry.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
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* ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
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* TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
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* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
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* BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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* POSSIBILITY OF SUCH DAMAGE.
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*/
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#include "SYS.h"
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#ifndef FUNCNAME
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#define FUNCNAME __syscall
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#define SYSTRAP_SYSCALL SYSTRAP(__syscall)
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#endif
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#if SYS_MAXSYSARGS > 8
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#error SYS_MAXSYSARGS is greater than 8
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#endif
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ENTRY(FUNCNAME)
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/*
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* AAPCS64 supplies the first 8 arguments in registers but since
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* the first argument is the syscall #, we only have room for 7
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* arguments. Thus if the syscall uses all 8 arguments, the last
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* argument will have been placed on the stack. Rather than
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* complicating the kernel syscall code to deal with that, we fixup
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* things here.
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*
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* First we move the syscall number to x17 freeing a register.
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* Then we move the rest of the arguments to their proper register.
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* Finally, load x7 from the stack.
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*
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* Now everything looks as if the syscall wrapper was directly called.
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* (unless it was for pipe, fork, vfork, ptrace, or __clone).
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*/
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mov x17, x0
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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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ldr x7, [sp, #0]
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SYSTRAP_SYSCALL
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_INVOKE_CERROR()
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ret
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END(FUNCNAME)
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