| Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 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 |
| Justin P. Mattock | 79add62 | 2011-04-04 14:15:29 -0700 | [diff] [blame] | 7 | * Copyright (C) 1996 David S. Miller (davem@davemloft.net) |
| Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 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 | */ |
| Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 13 | #include <asm/asm.h> |
| 14 | #include <asm/cachectl.h> |
| Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 15 | #include <asm/mipsregs.h> |
| Sam Ravnborg | 048eb58 | 2005-09-09 22:32:31 +0200 | [diff] [blame] | 16 | #include <asm/asm-offsets.h> |
| Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 17 | #include <asm/regdef.h> |
| 18 | #include <asm/stackframe.h> |
| 19 | #include <asm/thread_info.h> |
| 20 | |
| 21 | #include <asm/asmmacro.h> |
| 22 | |
| Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 23 | /* |
| Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 24 | * task_struct *resume(task_struct *prev, task_struct *next, |
| Paul Burton | 1a3d595 | 2015-08-03 08:49:30 -0700 | [diff] [blame] | 25 | * struct thread_info *next_ti) |
| Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 26 | */ |
| 27 | .align 5 |
| 28 | LEAF(resume) |
| Atsushi Nemoto | 5323180 | 2007-04-14 02:37:26 +0900 | [diff] [blame] | 29 | mfc0 t1, CP0_STATUS |
| 30 | LONG_S t1, THREAD_STATUS(a0) |
| Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 31 | cpu_save_nonscratch a0 |
| 32 | LONG_S ra, THREAD_REG31(a0) |
| 33 | |
| Linus Torvalds | 050e9ba | 2018-06-14 12:21:18 +0900 | [diff] [blame] | 34 | #if defined(CONFIG_STACKPROTECTOR) && !defined(CONFIG_SMP) |
| James Hogan | 8b3c569 | 2013-10-07 12:14:26 +0100 | [diff] [blame] | 35 | PTR_LA t8, __stack_chk_guard |
| Gregory Fong | 1400eb6 | 2013-06-17 19:36:07 +0000 | [diff] [blame] | 36 | LONG_L t9, TASK_STACK_CANARY(a1) |
| 37 | LONG_S t9, 0(t8) |
| 38 | #endif |
| 39 | |
| Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 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 | |
| Ralf Baechle | 3bd3966 | 2007-07-11 08:32:21 +0100 | [diff] [blame] | 47 | PTR_ADDU t0, $28, _THREAD_SIZE - 32 |
| Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 48 | set_saved_sp t0, t1, t2 |
| Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 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) |