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

   1 /* SPDX-License-Identifier: GPL-2.0 */
   2 #ifndef __ASM_SH_CMPXCHG_GRB_H
   3 #define __ASM_SH_CMPXCHG_GRB_H
   4
   5 static inline unsigned long xchg_u32(volatile u32 *m, unsigned long val)
   6 {
   7         unsigned long retval;
   8
   9         __asm__ __volatile__ (
  10                 "   .align 2              \n\t"
  11                 "   mova    1f,   r0      \n\t" /* r0 = end point */
  12                 "   nop                   \n\t"
  13                 "   mov    r15,   r1      \n\t" /* r1 = saved sp */
  14                 "   mov    #-4,   r15     \n\t" /* LOGIN */
  15                 "   mov.l  @%1,   %0      \n\t" /* load  old value */
  16                 "   mov.l   %2,   @%1     \n\t" /* store new value */
  17                 "1: mov     r1,   r15     \n\t" /* LOGOUT */
  18                 : "=&r" (retval),
  19                   "+r"  (m),
  20                   "+r"  (val)           /* inhibit r15 overloading */
  21                 :
  22                 : "memory", "r0", "r1");
  23
  24         return retval;
  25 }
  26
  27 static inline unsigned long xchg_u16(volatile u16 *m, unsigned long val)
  28 {
  29         unsigned long retval;
  30
  31         __asm__ __volatile__ (
  32                 "   .align  2             \n\t"
  33                 "   mova    1f,   r0      \n\t" /* r0 = end point */
  34                 "   mov    r15,   r1      \n\t" /* r1 = saved sp */
  35                 "   mov    #-6,   r15     \n\t" /* LOGIN */
  36                 "   mov.w  @%1,   %0      \n\t" /* load  old value */
  37                 "   extu.w  %0,   %0      \n\t" /* extend as unsigned */
  38                 "   mov.w   %2,   @%1     \n\t" /* store new value */
  39                 "1: mov     r1,   r15     \n\t" /* LOGOUT */
  40                 : "=&r" (retval),
  41                   "+r"  (m),
  42                   "+r"  (val)           /* inhibit r15 overloading */
  43                 :
  44                 : "memory" , "r0", "r1");
  45
  46         return retval;
  47 }
  48
  49 static inline unsigned long xchg_u8(volatile u8 *m, unsigned long val)
  50 {
  51         unsigned long retval;
  52
  53         __asm__ __volatile__ (
  54                 "   .align  2             \n\t"
  55                 "   mova    1f,   r0      \n\t" /* r0 = end point */
  56                 "   mov    r15,   r1      \n\t" /* r1 = saved sp */
  57                 "   mov    #-6,   r15     \n\t" /* LOGIN */
  58                 "   mov.b  @%1,   %0      \n\t" /* load  old value */
  59                 "   extu.b  %0,   %0      \n\t" /* extend as unsigned */
  60                 "   mov.b   %2,   @%1     \n\t" /* store new value */
  61                 "1: mov     r1,   r15     \n\t" /* LOGOUT */
  62                 : "=&r" (retval),
  63                   "+r"  (m),
  64                   "+r"  (val)           /* inhibit r15 overloading */
  65                 :
  66                 : "memory" , "r0", "r1");
  67
  68         return retval;
  69 }
  70
  71 static inline unsigned long __cmpxchg_u32(volatile int *m, unsigned long old,
  72                                           unsigned long new)
  73 {
  74         unsigned long retval;
  75
  76         __asm__ __volatile__ (
  77                 "   .align  2             \n\t"
  78                 "   mova    1f,   r0      \n\t" /* r0 = end point */
  79                 "   nop                   \n\t"
  80                 "   mov    r15,   r1      \n\t" /* r1 = saved sp */
  81                 "   mov    #-8,   r15     \n\t" /* LOGIN */
  82                 "   mov.l  @%3,   %0      \n\t" /* load  old value */
  83                 "   cmp/eq  %0,   %1      \n\t"
  84                 "   bf            1f      \n\t" /* if not equal */
  85                 "   mov.l   %2,   @%3     \n\t" /* store new value */
  86                 "1: mov     r1,   r15     \n\t" /* LOGOUT */
  87                 : "=&r" (retval),
  88                   "+r"  (old), "+r"  (new) /* old or new can be r15 */
  89                 :  "r"  (m)
  90                 : "memory" , "r0", "r1", "t");
  91
  92         return retval;
  93 }
  94
  95 #endif /* __ASM_SH_CMPXCHG_GRB_H */