arch/sh/include/asm/cmpxchg-grb.h

   1 #ifndef __ASM_SH_CMPXCHG_GRB_H
   2 #define __ASM_SH_CMPXCHG_GRB_H
   3
   4 static inline unsigned long xchg_u32(volatile u32 *m, unsigned long val)
   5 {
   6         unsigned long retval;
   7
   8         __asm__ __volatile__ (
   9                 "   .align 2              \n\t"
  10                 "   mova    1f,   r0      \n\t" /* r0 = end point */
  11                 "   nop                   \n\t"
  12                 "   mov    r15,   r1      \n\t" /* r1 = saved sp */
  13                 "   mov    #-4,   r15     \n\t" /* LOGIN */
  14                 "   mov.l  @%1,   %0      \n\t" /* load  old value */
  15                 "   mov.l   %2,   @%1     \n\t" /* store new value */
  16                 "1: mov     r1,   r15     \n\t" /* LOGOUT */
  17                 : "=&r" (retval),
  18                   "+r"  (m),
  19                   "+r"  (val)           /* inhibit r15 overloading */
  20                 :
  21                 : "memory", "r0", "r1");
  22
  23         return retval;
  24 }
  25
  26 static inline unsigned long xchg_u8(volatile u8 *m, unsigned long val)
  27 {
  28         unsigned long retval;
  29
  30         __asm__ __volatile__ (
  31                 "   .align  2             \n\t"
  32                 "   mova    1f,   r0      \n\t" /* r0 = end point */
  33                 "   mov    r15,   r1      \n\t" /* r1 = saved sp */
  34                 "   mov    #-6,   r15     \n\t" /* LOGIN */
  35                 "   mov.b  @%1,   %0      \n\t" /* load  old value */
  36                 "   extu.b  %0,   %0      \n\t" /* extend as unsigned */
  37                 "   mov.b   %2,   @%1     \n\t" /* store new value */
  38                 "1: mov     r1,   r15     \n\t" /* LOGOUT */
  39                 : "=&r" (retval),
  40                   "+r"  (m),
  41                   "+r"  (val)           /* inhibit r15 overloading */
  42                 :
  43                 : "memory" , "r0", "r1");
  44
  45         return retval;
  46 }
  47
  48 static inline unsigned long __cmpxchg_u32(volatile int *m, unsigned long old,
  49                                           unsigned long new)
  50 {
  51         unsigned long retval;
  52
  53         __asm__ __volatile__ (
  54                 "   .align  2             \n\t"
  55                 "   mova    1f,   r0      \n\t" /* r0 = end point */
  56                 "   nop                   \n\t"
  57                 "   mov    r15,   r1      \n\t" /* r1 = saved sp */
  58                 "   mov    #-8,   r15     \n\t" /* LOGIN */
  59                 "   mov.l  @%3,   %0      \n\t" /* load  old value */
  60                 "   cmp/eq  %0,   %1      \n\t"
  61                 "   bf            1f      \n\t" /* if not equal */
  62                 "   mov.l   %2,   @%3     \n\t" /* store new value */
  63                 "1: mov     r1,   r15     \n\t" /* LOGOUT */
  64                 : "=&r" (retval),
  65                   "+r"  (old), "+r"  (new) /* old or new can be r15 */
  66                 :  "r"  (m)
  67                 : "memory" , "r0", "r1", "t");
  68
  69         return retval;
  70 }
  71
  72 #endif /* __ASM_SH_CMPXCHG_GRB_H */