1 /* SPDX-License-Identifier: GPL-2.0 */
2 /*
3 * r2300_switch.S: R2300 specific task switchi
4 *
5 * Copyright (C) 1994, 1995, 1996, 1999 by Ral
6 * Copyright (C) 1994, 1995, 1996 by Andreas B
7 *
8 * Multi-cpu abstraction and macros for easier
9 * Copyright (C) 1996 David S. Miller (davem@d
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/fpregdef.h>
17 #include <asm/mipsregs.h>
18 #include <asm/asm-offsets.h>
19 #include <asm/regdef.h>
20 #include <asm/stackframe.h>
21 #include <asm/thread_info.h>
22
23 #include <asm/asmmacro.h>
24
25 .set mips1
26 .align 5
27
28 /*
29 * task_struct *resume(task_struct *prev, task
30 * struct thread_info *nex
31 */
32 LEAF(resume)
33 mfc0 t1, CP0_STATUS
34 sw t1, THREAD_STATUS(a0)
35 cpu_save_nonscratch a0
36 sw ra, THREAD_REG31(a0)
37
38 #if defined(CONFIG_STACKPROTECTOR) && !defined
39 PTR_LA t8, __stack_chk_guard
40 LONG_L t9, TASK_STACK_CANARY(a1)
41 LONG_S t9, 0(t8)
42 #endif
43
44 /*
45 * The order of restoring the register
46 * updating $28, $29 and kernelsp with
47 */
48 move $28, a2
49 cpu_restore_nonscratch a1
50
51 addiu t1, $28, _THREAD_SIZE - 32
52 sw t1, kernelsp
53
54 mfc0 t1, CP0_STATUS /* Do
55 li a3, 0xff01
56 and t1, a3
57 lw a2, THREAD_STATUS(a1)
58 nor a3, $0, a3
59 and a2, a3
60 or a2, t1
61 mtc0 a2, CP0_STATUS
62 move v0, a0
63 jr ra
64 END(resume)
Linux® is a registered trademark of Linus Torvalds in the United States and other countries.
TOMOYO® is a registered trademark of NTT DATA CORPORATION.