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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) 2001 Hiroyuki Kondo, Hirokazu Takata, and Hitoshi Yamamoto | |
7 | * Copyright (C) 2004, 2006 Hirokazu Takata <takata at linux-m32r.org> | |
8 | */ | |
9 | #ifndef _ASM_M32R_SWITCH_TO_H | |
10 | #define _ASM_M32R_SWITCH_TO_H | |
11 | ||
12 | /* | |
13 | * switch_to(prev, next) should switch from task `prev' to `next' | |
14 | * `prev' will never be the same as `next'. | |
15 | * | |
16 | * `next' and `prev' should be struct task_struct, but it isn't always defined | |
17 | */ | |
18 | ||
19 | #if defined(CONFIG_FRAME_POINTER) || \ | |
20 | !defined(CONFIG_SCHED_OMIT_FRAME_POINTER) | |
21 | #define M32R_PUSH_FP " push fp\n" | |
22 | #define M32R_POP_FP " pop fp\n" | |
23 | #else | |
24 | #define M32R_PUSH_FP "" | |
25 | #define M32R_POP_FP "" | |
26 | #endif | |
27 | ||
28 | #define switch_to(prev, next, last) do { \ | |
29 | __asm__ __volatile__ ( \ | |
30 | " seth lr, #high(1f) \n" \ | |
31 | " or3 lr, lr, #low(1f) \n" \ | |
32 | " st lr, @%4 ; store old LR \n" \ | |
33 | " ld lr, @%5 ; load new LR \n" \ | |
34 | M32R_PUSH_FP \ | |
35 | " st sp, @%2 ; store old SP \n" \ | |
36 | " ld sp, @%3 ; load new SP \n" \ | |
37 | " push %1 ; store `prev' on new stack \n" \ | |
38 | " jmp lr \n" \ | |
39 | " .fillinsn \n" \ | |
40 | "1: \n" \ | |
41 | " pop %0 ; restore `__last' from new stack \n" \ | |
42 | M32R_POP_FP \ | |
43 | : "=r" (last) \ | |
44 | : "0" (prev), \ | |
45 | "r" (&(prev->thread.sp)), "r" (&(next->thread.sp)), \ | |
46 | "r" (&(prev->thread.lr)), "r" (&(next->thread.lr)) \ | |
47 | : "memory", "lr" \ | |
48 | ); \ | |
49 | } while(0) | |
50 | ||
51 | #endif /* _ASM_M32R_SWITCH_TO_H */ |