xnu-4903.221.2.tar.gz

[apple/xnu.git] / libsyscall / os / tsd.h

diff --git a/libsyscall/os/tsd.h b/libsyscall/os/tsd.h
index d49087f1481048c693b2e9e930450a2bd624dbf4..474c97aec2976bba7491dc0bd2e3c457e3acac1e 100644 (file)
--- a/libsyscall/os/tsd.h
+++ b/libsyscall/os/tsd.h
@@ -29,8 +29,6 @@
 #ifndef OS_TSD_H
 #define OS_TSD_H
 
-#include <stdint.h>
-
 /* The low nine slots of the TSD are reserved for libsyscall usage. */
 #define __TSD_RESERVED_BASE 0
 #define __TSD_RESERVED_MAX 9
@@ -42,12 +40,20 @@
 #define __TSD_THREAD_QOS_CLASS 4
 #define __TSD_RETURN_TO_KERNEL 5
 /* slot 6 is reserved for Windows/WINE compatibility reasons */
+#define __TSD_PTR_MUNGE 7
+#define __TSD_MACH_SPECIAL_REPLY 8
 #define __TSD_SEMAPHORE_CACHE 9
 
+#ifndef __ASSEMBLER__
+
+#include <stdint.h>
+
 #ifdef __arm__
 #include <arm/arch.h>
 #endif
 
+extern void _thread_set_tsd_base(void *tsd_base);
+
 __attribute__((always_inline))
 static __inline__ unsigned int
 _os_cpu_number(void)
@@ -147,6 +153,61 @@ _os_tsd_set_direct(unsigned long slot, void *val)
 }
 #endif
 
-extern void _thread_set_tsd_base(void *tsd_base);
+__attribute__((always_inline, pure))
+static __inline__ uintptr_t
+_os_ptr_munge_token(void)
+{
+       return (uintptr_t)_os_tsd_get_direct(__TSD_PTR_MUNGE);
+}
 
-#endif
+__attribute__((always_inline, pure))
+static __inline__ uintptr_t
+_os_ptr_munge(uintptr_t ptr)
+{
+       return ptr ^ _os_ptr_munge_token();
+}
+#define _OS_PTR_MUNGE(_ptr) _os_ptr_munge((uintptr_t)(_ptr))
+#define _OS_PTR_UNMUNGE(_ptr) _os_ptr_munge((uintptr_t)(_ptr))
+
+#else // __ASSEMBLER__
+
+#define _OS_TSD_OFFSET(_key) \
+       ((__POINTER_WIDTH__/__CHAR_BIT__)*_key)
+
+#if defined(__i386__) || defined(__x86_64__)
+
+#define _OS_PTR_MUNGE(_reg) \
+       xor %gs:_OS_TSD_OFFSET(__TSD_PTR_MUNGE), _reg
+
+#define _OS_PTR_UNMUNGE(_reg) \
+       _OS_PTR_MUNGE(_reg)
+
+#elif defined(__arm__) || defined(__arm64__)
+
+#if defined(__arm__)
+
+#define _OS_PTR_MUNGE_TOKEN(_reg, _token) \
+       mrc p15, 0, _reg, c13, c0, 3; \
+       bic     _reg, _reg, #3; \
+       ldr     _token, [ _reg,  #_OS_TSD_OFFSET(__TSD_PTR_MUNGE) ]
+
+#elif defined(__arm64__)
+
+#define _OS_PTR_MUNGE_TOKEN(_reg, _token) \
+       mrs _reg, TPIDRRO_EL0 %% \
+       and     _reg, _reg, #~0x7 %% \
+       ldr     _token, [ _reg,  #_OS_TSD_OFFSET(__TSD_PTR_MUNGE) ]
+
+#endif // defined(__arm64__)
+
+#define _OS_PTR_MUNGE(_regdest, _regsrc, _token) \
+       eor _regdest, _regsrc, _token
+
+#define _OS_PTR_UNMUNGE(_regdest, _regsrc, _token) \
+       _OS_PTR_MUNGE(_regdest, _regsrc, _token)
+
+#endif // defined(__arm__) || defined(__arm64__)
+
+#endif // __ASSEMBLER__
+
+#endif // OS_TSD_H