1#include "libc.h"
2
3#if __ARM_ARCH_4__ || __ARM_ARCH_4T__ || __ARM_ARCH == 4
4#define BLX "mov lr,pc\n\tbx"
5#else
6#define BLX "blx"
7#endif
8
9extern hidden uintptr_t __a_cas_ptr, __a_barrier_ptr;
10
11#if ((__ARM_ARCH_6__ || __ARM_ARCH_6K__ || __ARM_ARCH_6KZ__ || __ARM_ARCH_6ZK__) && !__thumb__) \
12 || __ARM_ARCH_6T2__ || __ARM_ARCH_7A__ || __ARM_ARCH_7R__ || __ARM_ARCH >= 7
13
14#define a_ll a_ll
15static inline int a_ll(volatile int *p)
16{
17 int v;
18 __asm__ __volatile__ ("ldrex %0, %1" : "=r"(v) : "Q"(*p));
19 return v;
20}
21
22#define a_sc a_sc
23static inline int a_sc(volatile int *p, int v)
24{
25 int r;
26 __asm__ __volatile__ ("strex %0,%2,%1" : "=&r"(r), "=Q"(*p) : "r"(v) : "memory");
27 return !r;
28}
29
30#if __ARM_ARCH_7A__ || __ARM_ARCH_7R__ || __ARM_ARCH >= 7
31
32#define a_barrier a_barrier
33static inline void a_barrier()
34{
35 __asm__ __volatile__ ("dmb ish" : : : "memory");
36}
37
38#endif
39
40#define a_pre_llsc a_barrier
41#define a_post_llsc a_barrier
42
43#else
44
45#define a_cas a_cas
46static inline int a_cas(volatile int *p, int t, int s)
47{
48 for (;;) {
49 register int r0 __asm__("r0") = t;
50 register int r1 __asm__("r1") = s;
51 register volatile int *r2 __asm__("r2") = p;
52 register uintptr_t r3 __asm__("r3") = __a_cas_ptr;
53 int old;
54 __asm__ __volatile__ (
55 BLX " r3"
56 : "+r"(r0), "+r"(r3) : "r"(r1), "r"(r2)
57 : "memory", "lr", "ip", "cc" );
58 if (!r0) return t;
59 if ((old=*p)!=t) return old;
60 }
61}
62
63#endif
64
65#ifndef a_barrier
66#define a_barrier a_barrier
67static inline void a_barrier()
68{
69 register uintptr_t ip __asm__("ip") = __a_barrier_ptr;
70 __asm__ __volatile__( BLX " ip" : "+r"(ip) : : "memory", "cc", "lr" );
71}
72#endif
73
74#define a_crash a_crash
75static inline void a_crash()
76{
77 __asm__ __volatile__(
78#ifndef __thumb__
79 ".word 0xe7f000f0"
80#else
81 ".short 0xdeff"
82#endif
83 : : : "memory");
84}
85
86#if __ARM_ARCH >= 5 && (!__thumb__ || __thumb2__)
87
88#define a_clz_32 a_clz_32
89static inline int a_clz_32(uint32_t x)
90{
91 __asm__ ("clz %0, %1" : "=r"(x) : "r"(x));
92 return x;
93}
94
95#if __ARM_ARCH_6T2__ || __ARM_ARCH_7A__ || __ARM_ARCH_7R__ || __ARM_ARCH >= 7
96
97#define a_ctz_32 a_ctz_32
98static inline int a_ctz_32(uint32_t x)
99{
100 uint32_t xr;
101 __asm__ ("rbit %0, %1" : "=r"(xr) : "r"(x));
102 return a_clz_32(xr);
103}
104
105#endif
106
107#endif