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