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switch_to_32.h
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1 #ifndef __ASM_SH_SWITCH_TO_32_H
2 #define __ASM_SH_SWITCH_TO_32_H
3 
4 #ifdef CONFIG_SH_DSP
5 
6 #define is_dsp_enabled(tsk) \
7  (!!(tsk->thread.dsp_status.status & SR_DSP))
8 
9 #define __restore_dsp(tsk) \
10 do { \
11  register u32 *__ts2 __asm__ ("r2") = \
12  (u32 *)&tsk->thread.dsp_status; \
13  __asm__ __volatile__ ( \
14  ".balign 4\n\t" \
15  "movs.l @r2+, a0\n\t" \
16  "movs.l @r2+, a1\n\t" \
17  "movs.l @r2+, a0g\n\t" \
18  "movs.l @r2+, a1g\n\t" \
19  "movs.l @r2+, m0\n\t" \
20  "movs.l @r2+, m1\n\t" \
21  "movs.l @r2+, x0\n\t" \
22  "movs.l @r2+, x1\n\t" \
23  "movs.l @r2+, y0\n\t" \
24  "movs.l @r2+, y1\n\t" \
25  "lds.l @r2+, dsr\n\t" \
26  "ldc.l @r2+, rs\n\t" \
27  "ldc.l @r2+, re\n\t" \
28  "ldc.l @r2+, mod\n\t" \
29  : : "r" (__ts2)); \
30 } while (0)
31 
32 #define __save_dsp(tsk) \
33 do { \
34  register u32 *__ts2 __asm__ ("r2") = \
35  (u32 *)&tsk->thread.dsp_status + 14; \
36  \
37  __asm__ __volatile__ ( \
38  ".balign 4\n\t" \
39  "stc.l mod, @-r2\n\t" \
40  "stc.l re, @-r2\n\t" \
41  "stc.l rs, @-r2\n\t" \
42  "sts.l dsr, @-r2\n\t" \
43  "movs.l y1, @-r2\n\t" \
44  "movs.l y0, @-r2\n\t" \
45  "movs.l x1, @-r2\n\t" \
46  "movs.l x0, @-r2\n\t" \
47  "movs.l m1, @-r2\n\t" \
48  "movs.l m0, @-r2\n\t" \
49  "movs.l a1g, @-r2\n\t" \
50  "movs.l a0g, @-r2\n\t" \
51  "movs.l a1, @-r2\n\t" \
52  "movs.l a0, @-r2\n\t" \
53  : : "r" (__ts2)); \
54 } while (0)
55 
56 #else
57 
58 #define is_dsp_enabled(tsk) (0)
59 #define __save_dsp(tsk) do { } while (0)
60 #define __restore_dsp(tsk) do { } while (0)
61 #endif
62 
63 struct task_struct *__switch_to(struct task_struct *prev,
64  struct task_struct *next);
65 
66 /*
67  * switch_to() should switch tasks to task nr n, first
68  */
69 #define switch_to(prev, next, last) \
70 do { \
71  register u32 *__ts1 __asm__ ("r1"); \
72  register u32 *__ts2 __asm__ ("r2"); \
73  register u32 *__ts4 __asm__ ("r4"); \
74  register u32 *__ts5 __asm__ ("r5"); \
75  register u32 *__ts6 __asm__ ("r6"); \
76  register u32 __ts7 __asm__ ("r7"); \
77  struct task_struct *__last; \
78  \
79  if (is_dsp_enabled(prev)) \
80  __save_dsp(prev); \
81  \
82  __ts1 = (u32 *)&prev->thread.sp; \
83  __ts2 = (u32 *)&prev->thread.pc; \
84  __ts4 = (u32 *)prev; \
85  __ts5 = (u32 *)next; \
86  __ts6 = (u32 *)&next->thread.sp; \
87  __ts7 = next->thread.pc; \
88  \
89  __asm__ __volatile__ ( \
90  ".balign 4\n\t" \
91  "stc.l gbr, @-r15\n\t" \
92  "sts.l pr, @-r15\n\t" \
93  "mov.l r8, @-r15\n\t" \
94  "mov.l r9, @-r15\n\t" \
95  "mov.l r10, @-r15\n\t" \
96  "mov.l r11, @-r15\n\t" \
97  "mov.l r12, @-r15\n\t" \
98  "mov.l r13, @-r15\n\t" \
99  "mov.l r14, @-r15\n\t" \
100  "mov.l r15, @r1\t! save SP\n\t" \
101  "mov.l @r6, r15\t! change to new stack\n\t" \
102  "mova 1f, %0\n\t" \
103  "mov.l %0, @r2\t! save PC\n\t" \
104  "mov.l 2f, %0\n\t" \
105  "jmp @%0\t! call __switch_to\n\t" \
106  " lds r7, pr\t! with return to new PC\n\t" \
107  ".balign 4\n" \
108  "2:\n\t" \
109  ".long __switch_to\n" \
110  "1:\n\t" \
111  "mov.l @r15+, r14\n\t" \
112  "mov.l @r15+, r13\n\t" \
113  "mov.l @r15+, r12\n\t" \
114  "mov.l @r15+, r11\n\t" \
115  "mov.l @r15+, r10\n\t" \
116  "mov.l @r15+, r9\n\t" \
117  "mov.l @r15+, r8\n\t" \
118  "lds.l @r15+, pr\n\t" \
119  "ldc.l @r15+, gbr\n\t" \
120  : "=z" (__last) \
121  : "r" (__ts1), "r" (__ts2), "r" (__ts4), \
122  "r" (__ts5), "r" (__ts6), "r" (__ts7) \
123  : "r3", "t"); \
124  \
125  last = __last; \
126 } while (0)
127 
128 #define finish_arch_switch(prev) \
129 do { \
130  if (is_dsp_enabled(prev)) \
131  __restore_dsp(prev); \
132 } while (0)
133 
134 #endif /* __ASM_SH_SWITCH_TO_32_H */
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