HelenOS sources

root/kernel/arch/riscv64/src/context.S

#
# Copyright (c) 2003-2004 Jakub Jermar
# 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
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#include <abi/asmtool.h>
#include <arch/context_struct.h>

.text

FUNCTION_BEGIN(context_save_arch)
        sd gp, CONTEXT_OFFSET_GP(a0)
        sd tp, CONTEXT_OFFSET_TP(a0)
        sd s0, CONTEXT_OFFSET_S0(a0)
        sd s1, CONTEXT_OFFSET_S1(a0)
        sd s2, CONTEXT_OFFSET_S2(a0)
        sd s3, CONTEXT_OFFSET_S3(a0)
        sd s4, CONTEXT_OFFSET_S4(a0)
        sd s5, CONTEXT_OFFSET_S5(a0)
        sd s6, CONTEXT_OFFSET_S6(a0)
        sd s7, CONTEXT_OFFSET_S7(a0)
        sd s8, CONTEXT_OFFSET_S8(a0)
        sd s9, CONTEXT_OFFSET_S9(a0)
        sd s10, CONTEXT_OFFSET_S10(a0)
        sd s11, CONTEXT_OFFSET_S11(a0)

        sd ra, CONTEXT_OFFSET_PC(a0)
        sd sp, CONTEXT_OFFSET_SP(a0)

        # context_save returns 1
        li a0, 1
        ret
FUNCTION_END(context_save_arch)

FUNCTION_BEGIN(context_restore_arch)
        ld gp, CONTEXT_OFFSET_GP(a0)
        ld tp, CONTEXT_OFFSET_TP(a0)
        ld s0, CONTEXT_OFFSET_S0(a0)
        ld s1, CONTEXT_OFFSET_S1(a0)
        ld s2, CONTEXT_OFFSET_S2(a0)
        ld s3, CONTEXT_OFFSET_S3(a0)
        ld s4, CONTEXT_OFFSET_S4(a0)
        ld s5, CONTEXT_OFFSET_S5(a0)
        ld s6, CONTEXT_OFFSET_S6(a0)
        ld s7, CONTEXT_OFFSET_S7(a0)
        ld s8, CONTEXT_OFFSET_S8(a0)
        ld s9, CONTEXT_OFFSET_S9(a0)
        ld s10, CONTEXT_OFFSET_S10(a0)
        ld s11, CONTEXT_OFFSET_S11(a0)

        ld ra, CONTEXT_OFFSET_PC(a0)
        ld sp, CONTEXT_OFFSET_SP(a0)

        # context_restore returns 0
        li a0, 0
        ret
FUNCTION_END(context_restore_arch)