/* SPDX-License-Identifier: GPL-2.0 */
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/*
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* r2300_switch.S: R2300 specific task switching code.
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*
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* Copyright (C) 1994, 1995, 1996, 1999 by Ralf Baechle
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* Copyright (C) 1994, 1995, 1996 by Andreas Busse
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*
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* Multi-cpu abstraction and macros for easier reading:
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* Copyright (C) 1996 David S. Miller (davem@davemloft.net)
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*
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* Further modifications to make this work:
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* Copyright (c) 1998-2000 Harald Koerfgen
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*/
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#include <asm/asm.h>
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#include <asm/cachectl.h>
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#include <asm/export.h>
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#include <asm/fpregdef.h>
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#include <asm/mipsregs.h>
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#include <asm/asm-offsets.h>
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#include <asm/regdef.h>
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#include <asm/stackframe.h>
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#include <asm/thread_info.h>
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#include <asm/asmmacro.h>
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.set mips1
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.align 5
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/*
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* task_struct *resume(task_struct *prev, task_struct *next,
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* struct thread_info *next_ti)
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*/
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LEAF(resume)
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mfc0 t1, CP0_STATUS
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sw t1, THREAD_STATUS(a0)
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cpu_save_nonscratch a0
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sw ra, THREAD_REG31(a0)
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#if defined(CONFIG_STACKPROTECTOR) && !defined(CONFIG_SMP)
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PTR_LA t8, __stack_chk_guard
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LONG_L t9, TASK_STACK_CANARY(a1)
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LONG_S t9, 0(t8)
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#endif
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/*
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* The order of restoring the registers takes care of the race
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* updating $28, $29 and kernelsp without disabling ints.
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*/
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move $28, a2
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cpu_restore_nonscratch a1
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addiu t1, $28, _THREAD_SIZE - 32
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sw t1, kernelsp
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mfc0 t1, CP0_STATUS /* Do we really need this? */
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li a3, 0xff01
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and t1, a3
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lw a2, THREAD_STATUS(a1)
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nor a3, $0, a3
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and a2, a3
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or a2, t1
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mtc0 a2, CP0_STATUS
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move v0, a0
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jr ra
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END(resume)
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