source: mainline/arch/mips32/src/context.S@ a0bb10ef

#
# 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
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#
# - Redistributions of source code must retain the above copyright
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# THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
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#include <arch/asm/regname.h>
#include <arch/context_offset.h>
        
.text   

.set noat
.set noreorder
.set nomacro

.global context_save_arch
.global context_restore_arch

.macro CONTEXT_STORE r
        sw $s0,OFFSET_S0(\r)
        sw $s1,OFFSET_S1(\r)
        sw $s2,OFFSET_S2(\r)
        sw $s3,OFFSET_S3(\r)
        sw $s4,OFFSET_S4(\r)
        sw $s5,OFFSET_S5(\r)
        sw $s6,OFFSET_S6(\r)
        sw $s7,OFFSET_S7(\r)
        sw $s8,OFFSET_S8(\r)
        sw $gp,OFFSET_GP(\r)
        
        sw $ra,OFFSET_PC(\r)
        sw $sp,OFFSET_SP(\r)
.endm

.macro CONTEXT_LOAD r
        lw $s0,OFFSET_S0(\r)
        lw $s1,OFFSET_S1(\r)
        lw $s2,OFFSET_S2(\r)
        lw $s3,OFFSET_S3(\r)
        lw $s4,OFFSET_S4(\r)
        lw $s5,OFFSET_S5(\r)
        lw $s6,OFFSET_S6(\r)
        lw $s7,OFFSET_S7(\r)
        lw $s8,OFFSET_S8(\r)
        lw $gp,OFFSET_GP(\r)
        
        lw $ra,OFFSET_PC(\r)
        lw $sp,OFFSET_SP(\r)
.endm

        
context_save_arch:
        CONTEXT_STORE $a0

        # context_save returns 1
        j $31
        li $2, 1        
        
context_restore_arch:
        CONTEXT_LOAD $a0

        # context_restore returns 0
        j $31
        xor $2, $2