132 lines
3.5 KiB
C
132 lines
3.5 KiB
C
/* SPDX-License-Identifier: GPL-2.0 */
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#ifndef __ASM_SH_SWITCH_TO_32_H
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#define __ASM_SH_SWITCH_TO_32_H
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#ifdef CONFIG_SH_DSP
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#define is_dsp_enabled(tsk) \
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(!!(tsk->thread.dsp_status.status & SR_DSP))
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#define __restore_dsp(tsk) \
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do { \
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register u32 *__ts2 __asm__ ("r2") = \
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(u32 *)&tsk->thread.dsp_status; \
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__asm__ __volatile__ ( \
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".balign 4\n\t" \
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"movs.l @r2+, a0\n\t" \
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"movs.l @r2+, a1\n\t" \
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"movs.l @r2+, a0g\n\t" \
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"movs.l @r2+, a1g\n\t" \
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"movs.l @r2+, m0\n\t" \
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"movs.l @r2+, m1\n\t" \
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"movs.l @r2+, x0\n\t" \
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"movs.l @r2+, x1\n\t" \
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"movs.l @r2+, y0\n\t" \
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"movs.l @r2+, y1\n\t" \
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"lds.l @r2+, dsr\n\t" \
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"ldc.l @r2+, rs\n\t" \
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"ldc.l @r2+, re\n\t" \
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"ldc.l @r2+, mod\n\t" \
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: : "r" (__ts2)); \
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} while (0)
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#define __save_dsp(tsk) \
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do { \
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register u32 *__ts2 __asm__ ("r2") = \
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(u32 *)&tsk->thread.dsp_status + 14; \
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\
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__asm__ __volatile__ ( \
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".balign 4\n\t" \
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"stc.l mod, @-r2\n\t" \
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"stc.l re, @-r2\n\t" \
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"stc.l rs, @-r2\n\t" \
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"sts.l dsr, @-r2\n\t" \
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"movs.l y1, @-r2\n\t" \
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"movs.l y0, @-r2\n\t" \
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"movs.l x1, @-r2\n\t" \
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"movs.l x0, @-r2\n\t" \
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"movs.l m1, @-r2\n\t" \
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"movs.l m0, @-r2\n\t" \
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"movs.l a1g, @-r2\n\t" \
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"movs.l a0g, @-r2\n\t" \
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"movs.l a1, @-r2\n\t" \
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"movs.l a0, @-r2\n\t" \
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: : "r" (__ts2)); \
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} while (0)
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#else
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#define is_dsp_enabled(tsk) (0)
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#define __save_dsp(tsk) do { } while (0)
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#define __restore_dsp(tsk) do { } while (0)
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#endif
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struct task_struct *__switch_to(struct task_struct *prev,
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struct task_struct *next);
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/*
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* switch_to() should switch tasks to task nr n, first
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*/
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#define switch_to(prev, next, last) \
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do { \
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register u32 *__ts1 __asm__ ("r1"); \
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register u32 *__ts2 __asm__ ("r2"); \
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register u32 *__ts4 __asm__ ("r4"); \
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register u32 *__ts5 __asm__ ("r5"); \
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register u32 *__ts6 __asm__ ("r6"); \
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register u32 __ts7 __asm__ ("r7"); \
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struct task_struct *__last; \
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\
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if (is_dsp_enabled(prev)) \
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__save_dsp(prev); \
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if (is_dsp_enabled(next)) \
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__restore_dsp(next); \
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\
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__ts1 = (u32 *)&prev->thread.sp; \
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__ts2 = (u32 *)&prev->thread.pc; \
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__ts4 = (u32 *)prev; \
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__ts5 = (u32 *)next; \
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__ts6 = (u32 *)&next->thread.sp; \
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__ts7 = next->thread.pc; \
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\
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__asm__ __volatile__ ( \
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".balign 4\n\t" \
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"stc.l gbr, @-r15\n\t" \
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"sts.l pr, @-r15\n\t" \
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"mov.l r8, @-r15\n\t" \
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"mov.l r9, @-r15\n\t" \
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"mov.l r10, @-r15\n\t" \
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"mov.l r11, @-r15\n\t" \
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"mov.l r12, @-r15\n\t" \
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"mov.l r13, @-r15\n\t" \
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"mov.l r14, @-r15\n\t" \
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"mov.l r15, @r1\t! save SP\n\t" \
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"mov.l @r6, r15\t! change to new stack\n\t" \
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"mova 1f, %0\n\t" \
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"mov.l %0, @r2\t! save PC\n\t" \
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"mov.l 2f, %0\n\t" \
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"jmp @%0\t! call __switch_to\n\t" \
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" lds r7, pr\t! with return to new PC\n\t" \
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".balign 4\n" \
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"2:\n\t" \
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".long __switch_to\n" \
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"1:\n\t" \
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"mov.l @r15+, r14\n\t" \
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"mov.l @r15+, r13\n\t" \
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"mov.l @r15+, r12\n\t" \
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"mov.l @r15+, r11\n\t" \
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"mov.l @r15+, r10\n\t" \
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"mov.l @r15+, r9\n\t" \
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"mov.l @r15+, r8\n\t" \
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"lds.l @r15+, pr\n\t" \
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"ldc.l @r15+, gbr\n\t" \
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: "=z" (__last) \
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: "r" (__ts1), "r" (__ts2), "r" (__ts4), \
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"r" (__ts5), "r" (__ts6), "r" (__ts7) \
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: "r3", "t"); \
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\
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last = __last; \
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} while (0)
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#endif /* __ASM_SH_SWITCH_TO_32_H */
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