1 | /* |
2 | * This file is subject to the terms and conditions of the GNU General Public |
3 | * License. See the file "COPYING" in the main directory of this archive |
4 | * for more details. |
5 | * |
6 | * Copyright (C) 1994, 1995, 1996, 1998, 1999, 2002, 2003 Ralf Baechle |
7 | * Copyright (C) 1996 David S. Miller (davem@davemloft.net) |
8 | * Copyright (C) 1994, 1995, 1996, by Andreas Busse |
9 | * Copyright (C) 1999 Silicon Graphics, Inc. |
10 | * Copyright (C) 2000 MIPS Technologies, Inc. |
11 | * written by Carsten Langgaard, carstenl@mips.com |
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_struct *next, |
25 | * struct thread_info *next_ti) |
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(CONFIG_SMP) |
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 registers takes care of the race |
42 | * updating $28, $29 and kernelsp without disabling ints. |
43 | */ |
44 | move $28, a2 |
45 | cpu_restore_nonscratch a1 |
46 | |
47 | PTR_ADDU t0, $28, _THREAD_SIZE - 32 |
48 | set_saved_sp t0, t1, t2 |
49 | mfc0 t1, CP0_STATUS /* Do we really need this? */ |
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) |
60 | |