github.com/afumu/libc@v0.0.6/musl/arch/i386/atomic_arch.h (about)

     1  #define a_cas a_cas
     2  static inline int a_cas(volatile int *p, int t, int s)
     3  {
     4  	__asm__ __volatile__ (
     5  		"lock ; cmpxchg %3, %1"
     6  		: "=a"(t), "=m"(*p) : "a"(t), "r"(s) : "memory" );
     7  	return t;
     8  }
     9  
    10  #define a_swap a_swap
    11  static inline int a_swap(volatile int *p, int v)
    12  {
    13  	__asm__ __volatile__(
    14  		"xchg %0, %1"
    15  		: "=r"(v), "=m"(*p) : "0"(v) : "memory" );
    16  	return v;
    17  }
    18  
    19  #define a_fetch_add a_fetch_add
    20  static inline int a_fetch_add(volatile int *p, int v)
    21  {
    22  	__asm__ __volatile__(
    23  		"lock ; xadd %0, %1"
    24  		: "=r"(v), "=m"(*p) : "0"(v) : "memory" );
    25  	return v;
    26  }
    27  
    28  #define a_and a_and
    29  static inline void a_and(volatile int *p, int v)
    30  {
    31  	__asm__ __volatile__(
    32  		"lock ; and %1, %0"
    33  		: "=m"(*p) : "r"(v) : "memory" );
    34  }
    35  
    36  #define a_or a_or
    37  static inline void a_or(volatile int *p, int v)
    38  {
    39  	__asm__ __volatile__(
    40  		"lock ; or %1, %0"
    41  		: "=m"(*p) : "r"(v) : "memory" );
    42  }
    43  
    44  #define a_inc a_inc
    45  static inline void a_inc(volatile int *p)
    46  {
    47  	__asm__ __volatile__(
    48  		"lock ; incl %0"
    49  		: "=m"(*p) : "m"(*p) : "memory" );
    50  }
    51  
    52  #define a_dec a_dec
    53  static inline void a_dec(volatile int *p)
    54  {
    55  	__asm__ __volatile__(
    56  		"lock ; decl %0"
    57  		: "=m"(*p) : "m"(*p) : "memory" );
    58  }
    59  
    60  #define a_store a_store
    61  static inline void a_store(volatile int *p, int x)
    62  {
    63  	__asm__ __volatile__(
    64  		"mov %1, %0 ; lock ; orl $0,(%%esp)"
    65  		: "=m"(*p) : "r"(x) : "memory" );
    66  }
    67  
    68  #define a_barrier a_barrier
    69  static inline void a_barrier()
    70  {
    71  	__asm__ __volatile__( "" : : : "memory" );
    72  }
    73  
    74  #define a_spin a_spin
    75  static inline void a_spin()
    76  {
    77  	__asm__ __volatile__( "pause" : : : "memory" );
    78  }
    79  
    80  #define a_crash a_crash
    81  static inline void a_crash()
    82  {
    83  	__asm__ __volatile__( "hlt" : : : "memory" );
    84  }
    85  
    86  #define a_ctz_64 a_ctz_64
    87  static inline int a_ctz_64(uint64_t x)
    88  {
    89  	int r;
    90  	__asm__( "bsf %1,%0 ; jnz 1f ; bsf %2,%0 ; add $32,%0\n1:"
    91  		: "=&r"(r) : "r"((unsigned)x), "r"((unsigned)(x>>32)) );
    92  	return r;
    93  }
    94  
    95  #define a_ctz_32 a_ctz_32
    96  static inline int a_ctz_32(uint32_t x)
    97  {
    98  	int r;
    99  	__asm__( "bsf %1,%0" : "=r"(r) : "r"(x) );
   100  	return r;
   101  }
   102  
   103  #define a_clz_32 a_clz_32
   104  static inline int a_clz_32(uint32_t x)
   105  {
   106  	__asm__( "bsr %1,%0 ; xor $31,%0" : "=r"(x) : "r"(x) );
   107  	return x;
   108  }