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Linux/arch/mips/kernel/r2300_switch.S

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  1 /* SPDX-License-Identifier: GPL-2.0 */
  2 /*
  3  * r2300_switch.S: R2300 specific task switching code.
  4  *
  5  * Copyright (C) 1994, 1995, 1996, 1999 by Ralf Baechle
  6  * Copyright (C) 1994, 1995, 1996 by Andreas Busse
  7  *
  8  * Multi-cpu abstraction and macros for easier reading:
  9  * Copyright (C) 1996 David S. Miller (davem@davemloft.net)
 10  *
 11  * Further modifications to make this work:
 12  * Copyright (c) 1998-2000 Harald Koerfgen
 13  */
 14 #include <asm/asm.h>
 15 #include <asm/cachectl.h>
 16 #include <asm/export.h>
 17 #include <asm/fpregdef.h>
 18 #include <asm/mipsregs.h>
 19 #include <asm/asm-offsets.h>
 20 #include <asm/regdef.h>
 21 #include <asm/stackframe.h>
 22 #include <asm/thread_info.h>
 23 
 24 #include <asm/asmmacro.h>
 25 
 26         .set    mips1
 27         .align  5
 28 
 29 /*
 30  * task_struct *resume(task_struct *prev, task_struct *next,
 31  *                     struct thread_info *next_ti)
 32  */
 33 LEAF(resume)
 34         mfc0    t1, CP0_STATUS
 35         sw      t1, THREAD_STATUS(a0)
 36         cpu_save_nonscratch a0
 37         sw      ra, THREAD_REG31(a0)
 38 
 39 #if defined(CONFIG_STACKPROTECTOR) && !defined(CONFIG_SMP)
 40         PTR_LA  t8, __stack_chk_guard
 41         LONG_L  t9, TASK_STACK_CANARY(a1)
 42         LONG_S  t9, 0(t8)
 43 #endif
 44 
 45         /*
 46          * The order of restoring the registers takes care of the race
 47          * updating $28, $29 and kernelsp without disabling ints.
 48          */
 49         move    $28, a2
 50         cpu_restore_nonscratch a1
 51 
 52         addiu   t1, $28, _THREAD_SIZE - 32
 53         sw      t1, kernelsp
 54 
 55         mfc0    t1, CP0_STATUS          /* Do we really need this? */
 56         li      a3, 0xff01
 57         and     t1, a3
 58         lw      a2, THREAD_STATUS(a1)
 59         nor     a3, $0, a3
 60         and     a2, a3
 61         or      a2, t1
 62         mtc0    a2, CP0_STATUS
 63         move    v0, a0
 64         jr      ra
 65         END(resume)

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