132 lines
3.0 KiB
C++
132 lines
3.0 KiB
C++
/*
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* \brief Interface between kernel and userland
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* \author Adrian-Ken Rueegsegger
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* \date 2015-02-06
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*/
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/*
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* Copyright (C) 2015-2017 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 Affero General Public License version 3.
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*/
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/* Genode includes */
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#include <kernel/interface.h>
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using namespace Kernel;
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/************************************
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** Helper macros for kernel calls **
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************************************/
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/**
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* Assign argument registers according to AMD64 parameter passing
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* convention to avoid additional register copy operations.
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*/
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#define CALL_1_FILL_ARG_REGS \
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register Call_arg arg_0_reg asm("rdi") = arg_0;
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#define CALL_2_FILL_ARG_REGS \
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CALL_1_FILL_ARG_REGS \
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register Call_arg arg_1_reg asm("rsi") = arg_1;
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#define CALL_3_FILL_ARG_REGS \
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CALL_2_FILL_ARG_REGS \
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register Call_arg arg_2_reg asm("rdx") = arg_2;
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#define CALL_4_FILL_ARG_REGS \
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CALL_3_FILL_ARG_REGS \
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register Call_arg arg_3_reg asm("rcx") = arg_3;
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#define CALL_5_FILL_ARG_REGS \
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CALL_4_FILL_ARG_REGS \
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register Call_arg arg_4_reg asm("r8") = arg_4;
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#define CALL_6_FILL_ARG_REGS \
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CALL_5_FILL_ARG_REGS \
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register Call_arg arg_5_reg asm("r9") = arg_5;
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#define CALL_1_SYSCALL "int $0x80\n" : "+r" (arg_0_reg)
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#define CALL_2_SYSCALL CALL_1_SYSCALL: "r" (arg_1_reg)
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#define CALL_3_SYSCALL CALL_2_SYSCALL, "r" (arg_2_reg)
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#define CALL_4_SYSCALL CALL_3_SYSCALL, "r" (arg_3_reg)
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#define CALL_5_SYSCALL CALL_4_SYSCALL, "r" (arg_4_reg)
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#define CALL_6_SYSCALL CALL_5_SYSCALL, "r" (arg_5_reg)
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/******************
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** Kernel calls **
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******************/
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Call_ret Kernel::call(Call_arg arg_0)
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{
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CALL_1_FILL_ARG_REGS
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asm volatile(CALL_1_SYSCALL);
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return arg_0_reg;
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}
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Call_ret_64 Kernel::call64(Call_arg arg_0)
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{
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CALL_1_FILL_ARG_REGS
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asm volatile(CALL_1_SYSCALL);
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return arg_0_reg;
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}
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Call_ret Kernel::call(Call_arg arg_0,
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Call_arg arg_1)
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{
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CALL_2_FILL_ARG_REGS
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asm volatile(CALL_2_SYSCALL);
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return arg_0_reg;
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}
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Call_ret Kernel::call(Call_arg arg_0,
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Call_arg arg_1,
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Call_arg arg_2)
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{
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CALL_3_FILL_ARG_REGS
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asm volatile(CALL_3_SYSCALL);
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return arg_0_reg;
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}
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Call_ret Kernel::call(Call_arg arg_0,
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Call_arg arg_1,
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Call_arg arg_2,
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Call_arg arg_3)
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{
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CALL_4_FILL_ARG_REGS
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asm volatile(CALL_4_SYSCALL);
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return arg_0_reg;
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}
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Call_ret Kernel::call(Call_arg arg_0,
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Call_arg arg_1,
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Call_arg arg_2,
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Call_arg arg_3,
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Call_arg arg_4)
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{
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CALL_5_FILL_ARG_REGS
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asm volatile(CALL_5_SYSCALL);
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return arg_0_reg;
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}
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Call_ret Kernel::call(Call_arg arg_0,
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Call_arg arg_1,
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Call_arg arg_2,
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Call_arg arg_3,
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Call_arg arg_4,
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Call_arg arg_5)
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{
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CALL_6_FILL_ARG_REGS
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asm volatile(CALL_6_SYSCALL);
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return arg_0_reg;
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}
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