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switch_to_32.h
/* 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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