github.com/afumu/libc@v0.0.6/musl/arch/sh/atomic_arch.h (about)

     1  #include "libc.h"
     2  
     3  #if defined(__SH4A__)
     4  
     5  #define a_ll a_ll
     6  static inline int a_ll(volatile int *p)
     7  {
     8  	int v;
     9  	__asm__ __volatile__ ("movli.l @%1, %0" : "=z"(v) : "r"(p), "m"(*p));
    10  	return v;
    11  }
    12  
    13  #define a_sc a_sc
    14  static inline int a_sc(volatile int *p, int v)
    15  {
    16  	int r;
    17  	__asm__ __volatile__ (
    18  		"movco.l %2, @%3 ; movt %0"
    19  		: "=r"(r), "=m"(*p) : "z"(v), "r"(p) : "memory", "cc");
    20  	return r;
    21  }
    22  
    23  #define a_barrier a_barrier
    24  static inline void a_barrier()
    25  {
    26  	__asm__ __volatile__ ("synco" ::: "memory");
    27  }
    28  
    29  #define a_pre_llsc a_barrier
    30  #define a_post_llsc a_barrier
    31  
    32  #else
    33  
    34  #define a_cas a_cas
    35  extern hidden const void *__sh_cas_ptr;
    36  static inline int a_cas(volatile int *p, int t, int s)
    37  {
    38  	register int r1 __asm__("r1");
    39  	register int r2 __asm__("r2") = t;
    40  	register int r3 __asm__("r3") = s;
    41  	__asm__ __volatile__ (
    42  		"jsr @%4 ; nop"
    43  		: "=r"(r1), "+r"(r3) : "z"(p), "r"(r2), "r"(__sh_cas_ptr)
    44  		: "memory", "pr", "cc");
    45  	return r3;
    46  }
    47  
    48  #endif