Release 4.14 arch/m32r/include/asm/switch_to.h

/*
 * This file is subject to the terms and conditions of the GNU General Public
 * License.  See the file "COPYING" in the main directory of this archive
 * for more details.
 *
 * Copyright (C) 2001  Hiroyuki Kondo, Hirokazu Takata, and Hitoshi Yamamoto
 * Copyright (C) 2004, 2006  Hirokazu Takata <takata at linux-m32r.org>
 */
#ifndef _ASM_M32R_SWITCH_TO_H

#define _ASM_M32R_SWITCH_TO_H

/*
 * switch_to(prev, next) should switch from task `prev' to `next'
 * `prev' will never be the same as `next'.
 *
 * `next' and `prev' should be struct task_struct, but it isn't always defined
 */

#if defined(CONFIG_FRAME_POINTER) || \
	!defined(CONFIG_SCHED_OMIT_FRAME_POINTER)

#define M32R_PUSH_FP "       push fp\n"

#define M32R_POP_FP  "       pop  fp\n"
#else

#define M32R_PUSH_FP ""

#define M32R_POP_FP  ""
#endif


#define switch_to(prev, next, last)  do { \
        __asm__ __volatile__ ( \
                "       seth    lr, #high(1f)                           \n" \
                "       or3     lr, lr, #low(1f)                        \n" \
                "       st      lr, @%4  ; store old LR                 \n" \
                "       ld      lr, @%5  ; load new LR                  \n" \
                        M32R_PUSH_FP \
                "       st      sp, @%2  ; store old SP                 \n" \
                "       ld      sp, @%3  ; load new SP                  \n" \
                "       push    %1  ; store `prev' on new stack         \n" \
                "       jmp     lr                                      \n" \
                "       .fillinsn                                       \n" \
                "1:                                                     \n" \
                "       pop     %0  ; restore `__last' from new stack   \n" \
                        M32R_POP_FP \
                : "=r" (last) \
                : "0" (prev), \
                  "r" (&(prev->thread.sp)), "r" (&(next->thread.sp)), \
                  "r" (&(prev->thread.lr)), "r" (&(next->thread.lr)) \
                : "memory", "lr" \
        ); \
} while(0)

#endif /* _ASM_M32R_SWITCH_TO_H */
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Directory: arch/m32r/include/asm

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