1 /*
2 * This file is subject to the terms and condi
3 * License. See the file "COPYING" in the mai
4 * for more details.
5 *
6 * Copyright (C) 1994, 1995, 1996, 1998, 1999,
7 * Copyright (C) 1996 David S. Miller (davem@d
8 * Copyright (C) 1994, 1995, 1996, by Andreas
9 * Copyright (C) 1999 Silicon Graphics, Inc.
10 * Copyright (C) 2000 MIPS Technologies, Inc.
11 * written by Carsten Langgaard, carstenl@m
12 */
13 #include <asm/asm.h>
14 #include <asm/cachectl.h>
15 #include <asm/mipsregs.h>
16 #include <asm/asm-offsets.h>
17 #include <asm/regdef.h>
18 #include <asm/stackframe.h>
19 #include <asm/thread_info.h>
20
21 #include <asm/asmmacro.h>
22
23 /*
24 * task_struct *resume(task_struct *prev, task
25 * struct thread_info *nex
26 */
27 .align 5
28 LEAF(resume)
29 mfc0 t1, CP0_STATUS
30 LONG_S t1, THREAD_STATUS(a0)
31 cpu_save_nonscratch a0
32 LONG_S ra, THREAD_REG31(a0)
33
34 #if defined(CONFIG_STACKPROTECTOR) && !defined
35 PTR_LA t8, __stack_chk_guard
36 LONG_L t9, TASK_STACK_CANARY(a1)
37 LONG_S t9, 0(t8)
38 #endif
39
40 /*
41 * The order of restoring the register
42 * updating $28, $29 and kernelsp with
43 */
44 move $28, a2
45 cpu_restore_nonscratch a1
46
47 PTR_ADDU t0, $28, _THREAD_SIZE
48 set_saved_sp t0, t1, t2
49 mfc0 t1, CP0_STATUS /* Do
50 li a3, 0xff01
51 and t1, a3
52 LONG_L a2, THREAD_STATUS(a1)
53 nor a3, $0, a3
54 and a2, a3
55 or a2, t1
56 mtc0 a2, CP0_STATUS
57 move v0, a0
58 jr ra
59 END(resume)
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