1 /* SPDX-License-Identifier: GPL-2.0 */
2 #ifndef __ASM_SH_SWITCH_TO_32_H
3 #define __ASM_SH_SWITCH_TO_32_H
4
5 #ifdef CONFIG_SH_DSP
6
7 #define is_dsp_enabled(tsk) \
8 (!!(tsk->thread.dsp_status.status & SR_DSP))
9
10 #define __restore_dsp(tsk) \
11 do { \
12 register u32 *__ts2 __asm__ ("r2") = \
13 (u32 *)&tsk->thread.dsp_status; \
14 __asm__ __volatile__ ( \
15 ".balign 4\n\t" \
16 "movs.l @r2+, a0\n\t" \
17 "movs.l @r2+, a1\n\t" \
18 "movs.l @r2+, a0g\n\t" \
19 "movs.l @r2+, a1g\n\t" \
20 "movs.l @r2+, m0\n\t" \
21 "movs.l @r2+, m1\n\t" \
22 "movs.l @r2+, x0\n\t" \
23 "movs.l @r2+, x1\n\t" \
24 "movs.l @r2+, y0\n\t" \
25 "movs.l @r2+, y1\n\t" \
26 "lds.l @r2+, dsr\n\t" \
27 "ldc.l @r2+, rs\n\t" \
28 "ldc.l @r2+, re\n\t" \
29 "ldc.l @r2+, mod\n\t" \
30 : : "r" (__ts2)); \
31 } while (0)
32
33 #define __save_dsp(tsk) \
34 do { \
35 register u32 *__ts2 __asm__ ("r2") = \
36 (u32 *)&tsk->thread.dsp_status + 14; \
37 \
38 __asm__ __volatile__ ( \
39 ".balign 4\n\t" \
40 "stc.l mod, @-r2\n\t" \
41 "stc.l re, @-r2\n\t" \
42 "stc.l rs, @-r2\n\t" \
43 "sts.l dsr, @-r2\n\t" \
44 "movs.l y1, @-r2\n\t" \
45 "movs.l y0, @-r2\n\t" \
46 "movs.l x1, @-r2\n\t" \
47 "movs.l x0, @-r2\n\t" \
48 "movs.l m1, @-r2\n\t" \
49 "movs.l m0, @-r2\n\t" \
50 "movs.l a1g, @-r2\n\t" \
51 "movs.l a0g, @-r2\n\t" \
52 "movs.l a1, @-r2\n\t" \
53 "movs.l a0, @-r2\n\t" \
54 : : "r" (__ts2)); \
55 } while (0)
56
57 #else
58
59 #define is_dsp_enabled(tsk) (0)
60 #define __save_dsp(tsk) do { } while (0)
61 #define __restore_dsp(tsk) do { } while (0)
62 #endif
63
64 struct task_struct *__switch_to(struct task_struct *prev,
65 struct task_struct *next);
66
67 /*
68 * switch_to() should switch tasks to task nr n, first
69 */
70 #define switch_to(prev, next, last) \
71 do { \
72 register u32 *__ts1 __asm__ ("r1"); \
73 register u32 *__ts2 __asm__ ("r2"); \
74 register u32 *__ts4 __asm__ ("r4"); \
75 register u32 *__ts5 __asm__ ("r5"); \
76 register u32 *__ts6 __asm__ ("r6"); \
77 register u32 __ts7 __asm__ ("r7"); \
78 struct task_struct *__last; \
79 \
80 if (is_dsp_enabled(prev)) \
81 __save_dsp(prev); \
82 if (is_dsp_enabled(next)) \
83 __restore_dsp(next); \
84 \
85 __ts1 = (u32 *)&prev->thread.sp; \
86 __ts2 = (u32 *)&prev->thread.pc; \
87 __ts4 = (u32 *)prev; \
88 __ts5 = (u32 *)next; \
89 __ts6 = (u32 *)&next->thread.sp; \
90 __ts7 = next->thread.pc; \
91 \
92 __asm__ __volatile__ ( \
93 ".balign 4\n\t" \
94 "stc.l gbr, @-r15\n\t" \
95 "sts.l pr, @-r15\n\t" \
96 "mov.l r8, @-r15\n\t" \
97 "mov.l r9, @-r15\n\t" \
98 "mov.l r10, @-r15\n\t" \
99 "mov.l r11, @-r15\n\t" \
100 "mov.l r12, @-r15\n\t" \
101 "mov.l r13, @-r15\n\t" \
102 "mov.l r14, @-r15\n\t" \
103 "mov.l r15, @r1\t! save SP\n\t" \
104 "mov.l @r6, r15\t! change to new stack\n\t" \
105 "mova 1f, %0\n\t" \
106 "mov.l %0, @r2\t! save PC\n\t" \
107 "mov.l 2f, %0\n\t" \
108 "jmp @%0\t! call __switch_to\n\t" \
109 " lds r7, pr\t! with return to new PC\n\t" \
110 ".balign 4\n" \
111 "2:\n\t" \
112 ".long __switch_to\n" \
113 "1:\n\t" \
114 "mov.l @r15+, r14\n\t" \
115 "mov.l @r15+, r13\n\t" \
116 "mov.l @r15+, r12\n\t" \
117 "mov.l @r15+, r11\n\t" \
118 "mov.l @r15+, r10\n\t" \
119 "mov.l @r15+, r9\n\t" \
120 "mov.l @r15+, r8\n\t" \
121 "lds.l @r15+, pr\n\t" \
122 "ldc.l @r15+, gbr\n\t" \
123 : "=z" (__last) \
124 : "r" (__ts1), "r" (__ts2), "r" (__ts4), \
125 "r" (__ts5), "r" (__ts6), "r" (__ts7) \
126 : "r3", "t"); \
127 \
128 last = __last; \
129 } while (0)
130
131 #endif /* __ASM_SH_SWITCH_TO_32_H */