about summary refs log tree commit diff
path: root/src/thread/arm/__set_thread_area.c
blob: 09de65aab04aa8a225d62515d74b61740a4ba8b7 (plain) (blame)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
#include <stdint.h>
#include <elf.h>
#include "pthread_impl.h"
#include "libc.h"

#define HWCAP_TLS (1 << 15)

extern hidden const unsigned char
	__a_barrier_oldkuser[], __a_barrier_v6[], __a_barrier_v7[],
	__a_cas_v6[], __a_cas_v7[],
	__a_gettp_cp15[];

#define __a_barrier_kuser 0xffff0fa0
#define __a_barrier_oldkuser (uintptr_t)__a_barrier_oldkuser
#define __a_barrier_v6 (uintptr_t)__a_barrier_v6
#define __a_barrier_v7 (uintptr_t)__a_barrier_v7

#define __a_cas_kuser 0xffff0fc0
#define __a_cas_v6 (uintptr_t)__a_cas_v6
#define __a_cas_v7 (uintptr_t)__a_cas_v7

#define __a_gettp_kuser 0xffff0fe0
#define __a_gettp_cp15 (uintptr_t)__a_gettp_cp15

extern hidden uintptr_t __a_barrier_ptr, __a_cas_ptr, __a_gettp_ptr;

int __set_thread_area(void *p)
{
#if !__ARM_ARCH_7A__ && !__ARM_ARCH_7R__ && __ARM_ARCH < 7
	if (__hwcap & HWCAP_TLS) {
		size_t *aux;
		__a_cas_ptr = __a_cas_v7;
		__a_barrier_ptr = __a_barrier_v7;
		for (aux=libc.auxv; *aux; aux+=2) {
			if (*aux != AT_PLATFORM) continue;
			const char *s = (void *)aux[1];
			if (s[0]!='v' || s[1]!='6' || s[2]-'0'<10u) break;
			__a_cas_ptr = __a_cas_v6;
			__a_barrier_ptr = __a_barrier_v6;
			break;
		}
	} else {
		int ver = *(int *)0xffff0ffc;
		__a_gettp_ptr = __a_gettp_kuser;
		__a_cas_ptr = __a_cas_kuser;
		__a_barrier_ptr = __a_barrier_kuser;
		if (ver < 2) a_crash();
		if (ver < 3) __a_barrier_ptr = __a_barrier_oldkuser;
	}
#endif
	return __syscall(0xf0005, p);
}