/*
* Copyright (c) 2015 Petr Pavlu
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
*
* - Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* - Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* - The name of the author may not be used to endorse or promote products
* derived from this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
/** @addtogroup libcarm64
* @{
*/
/** @file
* @brief Syscall routine.
*/
#include <libc.h>
/** Syscall routine.
*
* Stores p1-p6, id to r0-r6 registers and calls <code>svc</code> instruction.
* Returned value is read from r0 register.
*
* @param p1 Parameter 1.
* @param p2 Parameter 2.
* @param p3 Parameter 3.
* @param p4 Parameter 4.
* @param p5 Parameter 5.
* @param p6 Parameter 6.
* @param id Number of syscall.
*
* @return Syscall return value.
*/
sysarg_t __syscall(const sysarg_t p1, const sysarg_t p2, const sysarg_t p3,
const sysarg_t p4, const sysarg_t p5, const sysarg_t p6,
const syscall_t id)
{
register sysarg_t __arm_reg_x0 asm("x0") = p1;
register sysarg_t __arm_reg_x1 asm("x1") = p2;
register sysarg_t __arm_reg_x2 asm("x2") = p3;
register sysarg_t __arm_reg_x3 asm("x3") = p4;
register sysarg_t __arm_reg_x4 asm("x4") = p5;
register sysarg_t __arm_reg_x5 asm("x5") = p6;
register sysarg_t __arm_reg_x6 asm("x6") = id;
asm volatile (
"svc #0"
: "=r" (__arm_reg_x0)
: "r" (__arm_reg_x0),
"r" (__arm_reg_x1),
"r" (__arm_reg_x2),
"r" (__arm_reg_x3),
"r" (__arm_reg_x4),
"r" (__arm_reg_x5),
"r" (__arm_reg_x6)
:
/*
* Clobber memory too as some arguments might be actually
* pointers.
*/
"memory"
);
return __arm_reg_x0;
}
/** @}
*/