switch_to_32.h (3631B)
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) \ 11do { \ 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) \ 34do { \ 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 64struct 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) \ 71do { \ 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 */