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Linux/arch/h8300/include/asm/switch_to.h

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  1 /* SPDX-License-Identifier: GPL-2.0 */
  2 #ifndef _H8300_SWITCH_TO_H
  3 #define _H8300_SWITCH_TO_H
  4 
  5 /*
  6  * switch_to(n) should switch tasks to task ptr, first checking that
  7  * ptr isn't the current task, in which case it does nothing.  This
  8  * also clears the TS-flag if the task we switched to has used the
  9  * math co-processor latest.
 10  */
 11 /*
 12  * switch_to() saves the extra registers, that are not saved
 13  * automatically by SAVE_SWITCH_STACK in resume(), ie. d0-d5 and
 14  * a0-a1. Some of these are used by schedule() and its predecessors
 15  * and so we might get see unexpected behaviors when a task returns
 16  * with unexpected register values.
 17  *
 18  * syscall stores these registers itself and none of them are used
 19  * by syscall after the function in the syscall has been called.
 20  *
 21  * Beware that resume now expects *next to be in d1 and the offset of
 22  * tss to be in a1. This saves a few instructions as we no longer have
 23  * to push them onto the stack and read them back right after.
 24  *
 25  * 02/17/96 - Jes Sorensen (jds@kom.auc.dk)
 26  *
 27  * Changed 96/09/19 by Andreas Schwab
 28  * pass prev in a0, next in a1, offset of tss in d1, and whether
 29  * the mm structures are shared in d2 (to avoid atc flushing).
 30  *
 31  * H8/300 Porting 2002/09/04 Yoshinori Sato
 32  */
 33 
 34 asmlinkage void resume(void);
 35 #define switch_to(prev, next, last) \
 36 do {                         \
 37         void *_last;                                        \
 38         __asm__ __volatile__(                               \
 39                 "mov.l  %1, er0\n\t"                        \
 40                 "mov.l  %2, er1\n\t"                        \
 41                 "mov.l  %3, er2\n\t"                        \
 42                 "jsr @_resume\n\t"                          \
 43                 "mov.l  er2,%0\n\t"                         \
 44                 : "=r" (_last)                              \
 45                 : "r" (&(prev->thread)),                    \
 46                   "r" (&(next->thread)),                    \
 47                   "g" (prev)                                \
 48                 : "cc", "er0", "er1", "er2", "er3");        \
 49         (last) = _last;                                     \
 50 } while (0)
 51 
 52 #endif /* _H8300_SWITCH_TO_H */
 53 

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