1 files changed, 52 insertions, 0 deletions
diff --git a/libc-top-half/musl/src/thread/arm/__set_thread_area.c b/libc-top-half/musl/src/thread/arm/__set_thread_area.c
new file mode 100644
index 0000000..09de65a
--- /dev/null
+++ b/libc-top-half/musl/src/thread/arm/__set_thread_area.c
@@ -0,0 +1,52 @@
+#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);
+}