arch/sh/include/asm/system_32.h

   1 #ifndef __ASM_SH_SYSTEM_32_H
   2 #define __ASM_SH_SYSTEM_32_H
   3
   4 #include <linux/types.h>
   5
   6 struct task_struct *__switch_to(struct task_struct *prev,
   7                                 struct task_struct *next);
   8
   9 /*
  10  *      switch_to() should switch tasks to task nr n, first
  11  */
  12 #define switch_to(prev, next, last)                                     \
  13 do {                                                                    \
  14         register u32 *__ts1 __asm__ ("r1") = (u32 *)&prev->thread.sp;   \
  15         register u32 *__ts2 __asm__ ("r2") = (u32 *)&prev->thread.pc;   \
  16         register u32 *__ts4 __asm__ ("r4") = (u32 *)prev;               \
  17         register u32 *__ts5 __asm__ ("r5") = (u32 *)next;               \
  18         register u32 *__ts6 __asm__ ("r6") = (u32 *)&next->thread.sp;   \
  19         register u32 __ts7 __asm__ ("r7") = next->thread.pc;            \
  20         struct task_struct *__last;                                     \
  21                                                                         \
  22         __asm__ __volatile__ (                                          \
  23                 ".balign 4\n\t"                                         \
  24                 "stc.l  gbr, @-r15\n\t"                                 \
  25                 "sts.l  pr, @-r15\n\t"                                  \
  26                 "mov.l  r8, @-r15\n\t"                                  \
  27                 "mov.l  r9, @-r15\n\t"                                  \
  28                 "mov.l  r10, @-r15\n\t"                                 \
  29                 "mov.l  r11, @-r15\n\t"                                 \
  30                 "mov.l  r12, @-r15\n\t"                                 \
  31                 "mov.l  r13, @-r15\n\t"                                 \
  32                 "mov.l  r14, @-r15\n\t"                                 \
  33                 "mov.l  r15, @r1\t! save SP\n\t"                        \
  34                 "mov.l  @r6, r15\t! change to new stack\n\t"            \
  35                 "mova   1f, %0\n\t"                                     \
  36                 "mov.l  %0, @r2\t! save PC\n\t"                         \
  37                 "mov.l  2f, %0\n\t"                                     \
  38                 "jmp    @%0\t! call __switch_to\n\t"                    \
  39                 " lds   r7, pr\t!  with return to new PC\n\t"           \
  40                 ".balign        4\n"                                    \
  41                 "2:\n\t"                                                \
  42                 ".long  __switch_to\n"                                  \
  43                 "1:\n\t"                                                \
  44                 "mov.l  @r15+, r14\n\t"                                 \
  45                 "mov.l  @r15+, r13\n\t"                                 \
  46                 "mov.l  @r15+, r12\n\t"                                 \
  47                 "mov.l  @r15+, r11\n\t"                                 \
  48                 "mov.l  @r15+, r10\n\t"                                 \
  49                 "mov.l  @r15+, r9\n\t"                                  \
  50                 "mov.l  @r15+, r8\n\t"                                  \
  51                 "lds.l  @r15+, pr\n\t"                                  \
  52                 "ldc.l  @r15+, gbr\n\t"                                 \
  53                 : "=z" (__last)                                         \
  54                 : "r" (__ts1), "r" (__ts2), "r" (__ts4),                \
  55                   "r" (__ts5), "r" (__ts6), "r" (__ts7)                 \
  56                 : "r3", "t");                                           \
  57                                                                         \
  58         last = __last;                                                  \
  59 } while (0)
  60
  61 #define __uses_jump_to_uncached __attribute__ ((__section__ (".uncached.text")))
  62
  63 /*
  64  * Jump to uncached area.
  65  * When handling TLB or caches, we need to do it from an uncached area.
  66  */
  67 #define jump_to_uncached()                      \
  68 do {                                            \
  69         unsigned long __dummy;                  \
  70                                                 \
  71         __asm__ __volatile__(                   \
  72                 "mova   1f, %0\n\t"             \
  73                 "add    %1, %0\n\t"             \
  74                 "jmp    @%0\n\t"                \
  75                 " nop\n\t"                      \
  76                 ".balign 4\n"                   \
  77                 "1:"                            \
  78                 : "=&z" (__dummy)               \
  79                 : "r" (cached_to_uncached));    \
  80 } while (0)
  81
  82 /*
  83  * Back to cached area.
  84  */
  85 #define back_to_cached()                                \
  86 do {                                                    \
  87         unsigned long __dummy;                          \
  88         ctrl_barrier();                                 \
  89         __asm__ __volatile__(                           \
  90                 "mov.l  1f, %0\n\t"                     \
  91                 "jmp    @%0\n\t"                        \
  92                 " nop\n\t"                              \
  93                 ".balign 4\n"                           \
  94                 "1:     .long 2f\n"                     \
  95                 "2:"                                    \
  96                 : "=&r" (__dummy));                     \
  97 } while (0)
  98
  99 int handle_unaligned_access(opcode_t instruction, struct pt_regs *regs,
 100                             struct mem_access *ma);
 101
 102 #endif /* __ASM_SH_SYSTEM_32_H */