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- /*
- * Copyright (C) 2008 The Android Open Source Project
- * All rights reserved.
- *
- * Redistribution and use in source and binary forms, with or without
- * modification, are permitted provided that the following conditions
- * are met:
- * * Redistributions of source code must retain the above copyright
- * notice, this list of conditions and the following disclaimer.
- * * Redistributions in binary form must reproduce the above copyright
- * notice, this list of conditions and the following disclaimer in
- * the documentation and/or other materials provided with the
- * distribution.
- *
- * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
- * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
- * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
- * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
- * COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
- * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
- * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
- * OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
- * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
- * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
- * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
- * SUCH DAMAGE.
- */
- #ifndef _SYS_TLS_H
- #define _SYS_TLS_H
- #include <sys/cdefs.h>
- __BEGIN_DECLS
- /** WARNING WARNING WARNING
- **
- ** This header file is *NOT* part of the public Bionic ABI/API
- ** and should not be used/included by user-serviceable parts of
- ** the system (e.g. applications).
- **
- ** It is only provided here for the benefit of the system dynamic
- ** linker and the OpenGL sub-system (which needs to access the
- ** pre-allocated slot directly for performance reason).
- **/
- /* Well-known TLS slots. What data goes in which slot is arbitrary unless otherwise noted. */
- enum {
- TLS_SLOT_SELF = 0, /* The kernel requires this specific slot for x86. */
- TLS_SLOT_THREAD_ID,
- TLS_SLOT_ERRNO=5,
- /* These two aren't used by bionic itself, but allow the graphics code to
- * access TLS directly rather than using the pthread API. */
- TLS_SLOT_OPENGL_API,
- TLS_SLOT_OPENGL,
- /* This slot is only used to pass information from the dynamic linker to
- * libc.so when the C library is loaded in to memory. The C runtime init
- * function will then clear it. Since its use is extremely temporary,
- * we reuse an existing location that isn't needed during libc startup. */
- TLS_SLOT_BIONIC_PREINIT = TLS_SLOT_OPENGL_API,
- TLS_SLOT_STACK_GUARD=8, /* GCC requires this specific slot for x86. */
- TLS_SLOT_DLERROR,
- TLS_SLOT_FIRST_USER_SLOT /* Must come last! */
- };
- /*
- * Maximum number of elements in the TLS array.
- * POSIX says this must be at least 128, but Android has traditionally had only 64, minus those
- * ones used internally by bionic itself.
- * There are two kinds of slot used internally by bionic --- there are the well-known slots
- * enumerated above, and then there are those that are allocated during startup by calls to
- * pthread_key_create; grep for GLOBAL_INIT_THREAD_LOCAL_BUFFER to find those. We need to manually
- * maintain that second number, but pthread_test will fail if we forget.
- */
- #define GLOBAL_INIT_THREAD_LOCAL_BUFFER_COUNT 4
- /*
- * This is PTHREAD_KEYS_MAX + TLS_SLOT_FIRST_USER_SLOT + GLOBAL_INIT_THREAD_LOCAL_BUFFER_COUNT
- * rounded up to maintain stack alignment.
- */
- #define BIONIC_ALIGN(x, a) (((x) + (a - 1)) & ~(a - 1))
- #define BIONIC_TLS_SLOTS BIONIC_ALIGN(128 + TLS_SLOT_FIRST_USER_SLOT + GLOBAL_INIT_THREAD_LOCAL_BUFFER_COUNT, 4)
- /* syscall only, do not call directly */
- extern int __set_tls(void* ptr);
- /* get the TLS */
- #if defined(__arm__)
- # define __get_tls() \
- ({ register unsigned int __val; \
- asm ("mrc p15, 0, %0, c13, c0, 3" : "=r"(__val)); \
- (volatile void*) __val; })
- #elif defined(__mips__)
- # define __get_tls() \
- /* On mips32r1, this goes via a kernel illegal instruction trap that's optimized for v1. */ \
- ({ register unsigned int __val asm("v1"); \
- asm (" .set push\n" \
- " .set mips32r2\n" \
- " rdhwr %0,$29\n" \
- " .set pop\n" : "=r"(__val)); \
- (volatile void*) __val; })
- #elif defined(__i386__)
- # define __get_tls() \
- ({ register void* __val; \
- asm ("movl %%gs:0, %0" : "=r"(__val)); \
- (volatile void*) __val; })
- #else
- #error unsupported architecture
- #endif
- __END_DECLS
- #if defined(__cplusplus)
- struct KernelArgumentBlock;
- extern __LIBC_HIDDEN__ void __libc_init_tls(KernelArgumentBlock& args);
- #endif
- #endif /* _SYS_TLS_H */
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