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