161 lines
4.4 KiB
C++
161 lines
4.4 KiB
C++
/*
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* \brief Syscall-framework implementation for ARM V7A systems
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* \author Martin stein
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* \date 2011-11-30
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*/
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/*
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* Copyright (C) 2011-2013 Genode Labs GmbH
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*
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* This file is part of the Genode OS framework, which is distributed
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* under the terms of the GNU General Public License version 2.
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*/
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/* Genode includes */
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#include <base/syscall.h>
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using namespace Kernel;
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/******************************************************************
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** Inline assembly templates for syscalls with 1 to 6 arguments **
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******************************************************************/
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#define SYSCALL_6_ASM_OPS \
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"mov r5, #0 \n" \
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"add r5, %[arg_5] \n" \
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SYSCALL_5_ASM_OPS
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#define SYSCALL_5_ASM_OPS \
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"mov r4, #0 \n" \
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"add r4, %[arg_4] \n" \
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SYSCALL_4_ASM_OPS
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#define SYSCALL_4_ASM_OPS \
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"mov r3, #0 \n" \
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"add r3, %[arg_3] \n" \
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SYSCALL_3_ASM_OPS
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#define SYSCALL_3_ASM_OPS \
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"mov r2, #0 \n" \
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"add r2, %[arg_2] \n" \
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SYSCALL_2_ASM_OPS
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#define SYSCALL_2_ASM_OPS \
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"mov r1, #0 \n" \
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"add r1, %[arg_1] \n" \
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SYSCALL_1_ASM_OPS
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#define SYSCALL_1_ASM_OPS \
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"mov r0, #0 \n" \
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"add r0, %[arg_0] \n" \
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"svc 0x0 \n" \
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"mov %[result], #0 \n" \
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"add %[result], r0 "
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/*****************************************************************************
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** Inline assembly "writeable" template-args for syscalls with 1 to 6 args **
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*****************************************************************************/
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#define SYSCALL_6_ASM_WRITE [arg_5] "+r" (arg_5), SYSCALL_5_ASM_WRITE
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#define SYSCALL_5_ASM_WRITE [arg_4] "+r" (arg_4), SYSCALL_4_ASM_WRITE
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#define SYSCALL_4_ASM_WRITE [arg_3] "+r" (arg_3), SYSCALL_3_ASM_WRITE
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#define SYSCALL_3_ASM_WRITE [arg_2] "+r" (arg_2), SYSCALL_2_ASM_WRITE
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#define SYSCALL_2_ASM_WRITE [arg_1] "+r" (arg_1), SYSCALL_1_ASM_WRITE
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#define SYSCALL_1_ASM_WRITE \
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[arg_0] "+r" (arg_0), \
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[result] "+r" (result)
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/**********************************************************************
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** Inline assembly clobber lists for syscalls with 1 to 6 arguments **
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**********************************************************************/
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#define SYSCALL_6_ASM_CLOBBER "r5", SYSCALL_5_ASM_CLOBBER
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#define SYSCALL_5_ASM_CLOBBER "r4", SYSCALL_4_ASM_CLOBBER
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#define SYSCALL_4_ASM_CLOBBER "r3", SYSCALL_3_ASM_CLOBBER
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#define SYSCALL_3_ASM_CLOBBER "r2", SYSCALL_2_ASM_CLOBBER
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#define SYSCALL_2_ASM_CLOBBER "r1", SYSCALL_1_ASM_CLOBBER
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#define SYSCALL_1_ASM_CLOBBER "r0"
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/************************************
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** Syscalls with 1 to 6 arguments **
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************************************/
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Syscall_ret Kernel::syscall(Syscall_arg arg_0)
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{
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Syscall_ret result = 0;
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asm volatile(SYSCALL_1_ASM_OPS
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: SYSCALL_1_ASM_WRITE
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:: SYSCALL_1_ASM_CLOBBER);
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return result;
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}
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Syscall_ret Kernel::syscall(Syscall_arg arg_0,
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Syscall_arg arg_1)
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{
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Syscall_ret result = 0;
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asm volatile(SYSCALL_2_ASM_OPS
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: SYSCALL_2_ASM_WRITE
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:: SYSCALL_2_ASM_CLOBBER);
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return result;
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}
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Syscall_ret Kernel::syscall(Syscall_arg arg_0,
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Syscall_arg arg_1,
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Syscall_arg arg_2)
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{
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Syscall_ret result = 0;
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asm volatile(SYSCALL_3_ASM_OPS
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: SYSCALL_3_ASM_WRITE
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:: SYSCALL_3_ASM_CLOBBER);
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return result;
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}
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Syscall_ret Kernel::syscall(Syscall_arg arg_0,
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Syscall_arg arg_1,
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Syscall_arg arg_2,
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Syscall_arg arg_3)
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{
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Syscall_ret result = 0;
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asm volatile(SYSCALL_4_ASM_OPS
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: SYSCALL_4_ASM_WRITE
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:: SYSCALL_4_ASM_CLOBBER);
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return result;
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}
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Syscall_ret Kernel::syscall(Syscall_arg arg_0,
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Syscall_arg arg_1,
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Syscall_arg arg_2,
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Syscall_arg arg_3,
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Syscall_arg arg_4)
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{
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Syscall_ret result = 0;
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asm volatile(SYSCALL_5_ASM_OPS
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: SYSCALL_5_ASM_WRITE
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:: SYSCALL_5_ASM_CLOBBER);
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return result;
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}
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Syscall_ret Kernel::syscall(Syscall_arg arg_0,
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Syscall_arg arg_1,
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Syscall_arg arg_2,
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Syscall_arg arg_3,
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Syscall_arg arg_4,
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Syscall_arg arg_5)
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{
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Syscall_ret result = 0;
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asm volatile(SYSCALL_6_ASM_OPS
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: SYSCALL_6_ASM_WRITE
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:: SYSCALL_6_ASM_CLOBBER);
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return result;
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}
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