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/* 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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