181 lines
4.6 KiB
C++
181 lines
4.6 KiB
C++
/*
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* \brief Interface between kernel and userland
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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 <kernel/interface.h>
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using namespace Kernel;
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/**********************************************************************
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** Inline assembly templates for kernel calls with 1 to 6 arguments **
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**********************************************************************/
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#define CALL_6_ASM_OPS \
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"mov r5, #0 \n" \
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"add r5, %[arg_5] \n" \
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CALL_5_ASM_OPS
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#define CALL_5_ASM_OPS \
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"mov r4, #0 \n" \
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"add r4, %[arg_4] \n" \
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CALL_4_ASM_OPS
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#define CALL_4_ASM_OPS \
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"mov r3, #0 \n" \
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"add r3, %[arg_3] \n" \
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CALL_3_ASM_OPS
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#define CALL_3_ASM_OPS \
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"mov r2, #0 \n" \
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"add r2, %[arg_2] \n" \
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CALL_2_ASM_OPS
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#define CALL_2_ASM_OPS \
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"mov r1, #0 \n" \
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"add r1, %[arg_1] \n" \
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CALL_1_ASM_OPS
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#define CALL_1_ASM_OPS \
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"mov r0, #0 \n" \
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"add r0, %[arg_0] \n" \
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"swi 0 \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" tpl-args for kernel calls with 1 to 6 args **
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****************************************************************************/
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#define CALL_6_ASM_WRITE [arg_5] "+r" (arg_5), CALL_5_ASM_WRITE
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#define CALL_5_ASM_WRITE [arg_4] "+r" (arg_4), CALL_4_ASM_WRITE
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#define CALL_4_ASM_WRITE [arg_3] "+r" (arg_3), CALL_3_ASM_WRITE
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#define CALL_3_ASM_WRITE [arg_2] "+r" (arg_2), CALL_2_ASM_WRITE
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#define CALL_2_ASM_WRITE [arg_1] "+r" (arg_1), CALL_1_ASM_WRITE
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#define CALL_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 kernel calls with 1 to 6 arguments **
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**************************************************************************/
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#define CALL_6_ASM_CLOBBER "r5", CALL_5_ASM_CLOBBER
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#define CALL_5_ASM_CLOBBER "r4", CALL_4_ASM_CLOBBER
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#define CALL_4_ASM_CLOBBER "r3", CALL_3_ASM_CLOBBER
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#define CALL_3_ASM_CLOBBER "r2", CALL_2_ASM_CLOBBER
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#define CALL_2_ASM_CLOBBER "r1", CALL_1_ASM_CLOBBER
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#define CALL_1_ASM_CLOBBER "r0"
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/************************************
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** Calls with 1 to 6 arguments **
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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_ret result = 0;
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asm volatile(CALL_1_ASM_OPS
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: CALL_1_ASM_WRITE
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:: CALL_1_ASM_CLOBBER);
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return result;
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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_ret result = 0;
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asm volatile(CALL_2_ASM_OPS
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: CALL_2_ASM_WRITE
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:: CALL_2_ASM_CLOBBER);
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return result;
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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_ret result = 0;
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asm volatile(CALL_3_ASM_OPS
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: CALL_3_ASM_WRITE
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:: CALL_3_ASM_CLOBBER);
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return result;
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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_ret result = 0;
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asm volatile(CALL_4_ASM_OPS
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: CALL_4_ASM_WRITE
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:: CALL_4_ASM_CLOBBER);
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return result;
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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_ret result = 0;
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asm volatile(CALL_5_ASM_OPS
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: CALL_5_ASM_WRITE
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:: CALL_5_ASM_CLOBBER);
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return result;
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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_ret result = 0;
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asm volatile(CALL_6_ASM_OPS
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: CALL_6_ASM_WRITE
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:: CALL_6_ASM_CLOBBER);
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return result;
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}
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/*************************
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** CPU-state utilities **
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*************************/
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typedef Thread_reg_id Reg_id;
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static addr_t const _cpu_state_regs[] = {
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Reg_id::R0, Reg_id::R1, Reg_id::R2, Reg_id::R3, Reg_id::R4,
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Reg_id::R5, Reg_id::R6, Reg_id::R7, Reg_id::R8, Reg_id::R9,
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Reg_id::R10, Reg_id::R11, Reg_id::R12, Reg_id::SP, Reg_id::LR,
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Reg_id::IP, Reg_id::CPSR, Reg_id::CPU_EXCEPTION };
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addr_t const * cpu_state_regs() { return _cpu_state_regs; }
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size_t cpu_state_regs_length()
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{
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return sizeof(_cpu_state_regs)/sizeof(_cpu_state_regs[0]);
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}
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