nptl/sysdeps/powerpc/tls.h - nest-cam/v366/glibc - Git at Google

 /* Definition for thread-local data handling.  NPTL/PowerPC version.
    Copyright (C) 2003, 2005, 2006, 2007 Free Software Foundation, Inc.
    This file is part of the GNU C Library.

    The GNU C Library is free software; you can redistribute it and/or
    modify it under the terms of the GNU Lesser General Public
    License as published by the Free Software Foundation; either
    version 2.1 of the License, or (at your option) any later version.

    The GNU C Library is distributed in the hope that it will be useful,
    but WITHOUT ANY WARRANTY; without even the implied warranty of
    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
    Lesser General Public License for more details.

    You should have received a copy of the GNU Lesser General Public
    License along with the GNU C Library; if not, write to the Free
    Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
    02111-1307 USA.  */

 #ifndef _TLS_H
 #define _TLS_H	1

 # include <dl-sysdep.h>

 #ifndef __ASSEMBLER__
 # include <stdbool.h>
 # include <stddef.h>
 # include <stdint.h>

 /* Type for the dtv.  */
 typedef union dtv
 {
   size_t counter;
   struct
   {
     void *val;
     bool is_static;
   } pointer;
 } dtv_t;

 #else /* __ASSEMBLER__ */
 # include <tcb-offsets.h>
 #endif /* __ASSEMBLER__ */


 /* We require TLS support in the tools.  */
 #ifndef HAVE_TLS_SUPPORT
 # error "TLS support is required."
 #endif

 #ifndef __ASSEMBLER__

 /* Get system call information.  */
 # include <sysdep.h>

 /* The TP points to the start of the thread blocks.  */
 # define TLS_DTV_AT_TP	1

 /* We use the multiple_threads field in the pthread struct */
 #define TLS_MULTIPLE_THREADS_IN_TCB	1

 /* Get the thread descriptor definition.  */
 # include <nptl/descr.h>

 /* The stack_guard is accessed directly by GCC -fstack-protector code,
    so it is a part of public ABI.  The dtv and pointer_guard fields
    are private.  */
 typedef struct
 {
   uintptr_t pointer_guard;
   uintptr_t stack_guard;
   dtv_t *dtv;
 } tcbhead_t;

 /* This is the size of the initial TCB.  */
 # define TLS_INIT_TCB_SIZE	0

 /* Alignment requirements for the initial TCB.  */
 # define TLS_INIT_TCB_ALIGN	__alignof__ (struct pthread)

 /* This is the size of the TCB.  */
 # define TLS_TCB_SIZE		0

 /* Alignment requirements for the TCB.  */
 # define TLS_TCB_ALIGN		__alignof__ (struct pthread)

 /* This is the size we need before TCB.  */
 # define TLS_PRE_TCB_SIZE \
   (sizeof (struct pthread)						      \
    + ((sizeof (tcbhead_t) + TLS_TCB_ALIGN - 1) & ~(TLS_TCB_ALIGN - 1)))

 # ifndef __powerpc64__
 /* Register r2 (tp) is reserved by the ABI as "thread pointer". */
 register void *__thread_register __asm__ ("r2");
 #  define PT_THREAD_POINTER PT_R2
 # else
 /* Register r13 (tp) is reserved by the ABI as "thread pointer". */
 register void *__thread_register __asm__ ("r13");
 #  define PT_THREAD_POINTER PT_R13
 # endif

 /* The following assumes that TP (R2 or R13) points to the end of the
    TCB + 0x7000 (per the ABI).  This implies that TCB address is
    TP - 0x7000.  As we define TLS_DTV_AT_TP we can
    assume that the pthread struct is allocated immediately ahead of the
    TCB.  This implies that the pthread_descr address is
    TP - (TLS_PRE_TCB_SIZE + 0x7000).  */
 # define TLS_TCB_OFFSET	0x7000

 /* Install the dtv pointer.  The pointer passed is to the element with
    index -1 which contain the length.  */
 # define INSTALL_DTV(tcbp, dtvp) \
   ((tcbhead_t *) (tcbp))[-1].dtv = dtvp + 1

 /* Install new dtv for current thread.  */
 # define INSTALL_NEW_DTV(dtv) (THREAD_DTV() = (dtv))

 /* Return dtv of given thread descriptor.  */
 # define GET_DTV(tcbp)	(((tcbhead_t *) (tcbp))[-1].dtv)

 /* Code to initially initialize the thread pointer.  This might need
    special attention since 'errno' is not yet available and if the
    operation can cause a failure 'errno' must not be touched.  */
 # define TLS_INIT_TP(tcbp, secondcall) \
     (__thread_register = (void *) (tcbp) + TLS_TCB_OFFSET, NULL)

 /* Return the address of the dtv for the current thread.  */
 # define THREAD_DTV() \
     (((tcbhead_t *) (__thread_register - TLS_TCB_OFFSET))[-1].dtv)

 /* Return the thread descriptor for the current thread.  */
 # define THREAD_SELF \
     ((struct pthread *) (__thread_register \
 			 - TLS_TCB_OFFSET - TLS_PRE_TCB_SIZE))

 /* Magic for libthread_db to know how to do THREAD_SELF.  */
 # define DB_THREAD_SELF							      \
   REGISTER (32, 32, PT_THREAD_POINTER * 4,				      \
 	    - TLS_TCB_OFFSET - TLS_PRE_TCB_SIZE)			      \
   REGISTER (64, 64, PT_THREAD_POINTER * 8,				      \
 	    - TLS_TCB_OFFSET - TLS_PRE_TCB_SIZE)

 /* Read member of the thread descriptor directly.  */
 # define THREAD_GETMEM(descr, member) ((void)(descr), (THREAD_SELF)->member)

 /* Same as THREAD_GETMEM, but the member offset can be non-constant.  */
 # define THREAD_GETMEM_NC(descr, member, idx) \
     ((void)(descr), (THREAD_SELF)->member[idx])

 /* Set member of the thread descriptor directly.  */
 # define THREAD_SETMEM(descr, member, value) \
     ((void)(descr), (THREAD_SELF)->member = (value))

 /* Same as THREAD_SETMEM, but the member offset can be non-constant.  */
 # define THREAD_SETMEM_NC(descr, member, idx, value) \
     ((void)(descr), (THREAD_SELF)->member[idx] = (value))

 /* Set the stack guard field in TCB head.  */
 # define THREAD_SET_STACK_GUARD(value) \
     (((tcbhead_t *) ((char *) __thread_register				      \
 		     - TLS_TCB_OFFSET))[-1].stack_guard = (value))
 # define THREAD_COPY_STACK_GUARD(descr) \
     (((tcbhead_t *) ((char *) (descr)					      \
 		     + TLS_PRE_TCB_SIZE))[-1].stack_guard		      \
      = ((tcbhead_t *) ((char *) __thread_register			      \
 		       - TLS_TCB_OFFSET))[-1].stack_guard)

 /* Set the stack guard field in TCB head.  */
 # define THREAD_GET_POINTER_GUARD() \
     (((tcbhead_t *) ((char *) __thread_register				      \
 		     - TLS_TCB_OFFSET))[-1].pointer_guard)
 # define THREAD_SET_POINTER_GUARD(value) \
     (THREAD_GET_POINTER_GUARD () = (value))
 # define THREAD_COPY_POINTER_GUARD(descr) \
     (((tcbhead_t *) ((char *) (descr)					      \
 		     + TLS_PRE_TCB_SIZE))[-1].pointer_guard		      \
      = THREAD_GET_POINTER_GUARD())

 /* l_tls_offset == 0 is perfectly valid on PPC, so we have to use some
    different value to mean unset l_tls_offset.  */
 # define NO_TLS_OFFSET		-1

 /* Get and set the global scope generation counter in struct pthread.  */
 #define THREAD_GSCOPE_FLAG_UNUSED 0
 #define THREAD_GSCOPE_FLAG_USED   1
 #define THREAD_GSCOPE_FLAG_WAIT   2
 #define THREAD_GSCOPE_RESET_FLAG() \
   do									     \
     { int __res								     \
 	= atomic_exchange_rel (&THREAD_SELF->header.gscope_flag,	     \
 			       THREAD_GSCOPE_FLAG_UNUSED);		     \
       if (__res == THREAD_GSCOPE_FLAG_WAIT)				     \
 	lll_futex_wake (&THREAD_SELF->header.gscope_flag, 1, LLL_PRIVATE);   \
     }									     \
   while (0)
 #define THREAD_GSCOPE_SET_FLAG() \
   do									     \
     {									     \
       THREAD_SELF->header.gscope_flag = THREAD_GSCOPE_FLAG_USED;	     \
       atomic_write_barrier ();						     \
     }									     \
   while (0)
 #define THREAD_GSCOPE_WAIT() \
   GL(dl_wait_lookup_done) ()

 #endif /* __ASSEMBLER__ */

 #endif	/* tls.h */
	/* Definition for thread-local data handling. NPTL/PowerPC version.
	Copyright (C) 2003, 2005, 2006, 2007 Free Software Foundation, Inc.
	This file is part of the GNU C Library.

	The GNU C Library is free software; you can redistribute it and/or
	modify it under the terms of the GNU Lesser General Public
	License as published by the Free Software Foundation; either
	version 2.1 of the License, or (at your option) any later version.

	The GNU C Library is distributed in the hope that it will be useful,
	but WITHOUT ANY WARRANTY; without even the implied warranty of
	MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
	Lesser General Public License for more details.

	You should have received a copy of the GNU Lesser General Public
	License along with the GNU C Library; if not, write to the Free
	Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
	02111-1307 USA. */

	#ifndef _TLS_H
	#define _TLS_H 1

	# include <dl-sysdep.h>

	#ifndef __ASSEMBLER__
	# include <stdbool.h>
	# include <stddef.h>
	# include <stdint.h>

	/* Type for the dtv. */
	typedef union dtv
	{
	size_t counter;
	struct
	{
	void *val;
	bool is_static;
	} pointer;
	} dtv_t;

	#else /* __ASSEMBLER__ */
	# include <tcb-offsets.h>
	#endif /* __ASSEMBLER__ */


	/* We require TLS support in the tools. */
	#ifndef HAVE_TLS_SUPPORT
	# error "TLS support is required."
	#endif

	#ifndef __ASSEMBLER__

	/* Get system call information. */
	# include <sysdep.h>

	/* The TP points to the start of the thread blocks. */
	# define TLS_DTV_AT_TP 1

	/* We use the multiple_threads field in the pthread struct */
	#define TLS_MULTIPLE_THREADS_IN_TCB 1

	/* Get the thread descriptor definition. */
	# include <nptl/descr.h>

	/* The stack_guard is accessed directly by GCC -fstack-protector code,
	so it is a part of public ABI. The dtv and pointer_guard fields
	are private. */
	typedef struct
	{
	uintptr_t pointer_guard;
	uintptr_t stack_guard;
	dtv_t *dtv;
	} tcbhead_t;

	/* This is the size of the initial TCB. */
	# define TLS_INIT_TCB_SIZE 0

	/* Alignment requirements for the initial TCB. */
	# define TLS_INIT_TCB_ALIGN __alignof__ (struct pthread)

	/* This is the size of the TCB. */
	# define TLS_TCB_SIZE 0

	/* Alignment requirements for the TCB. */
	# define TLS_TCB_ALIGN __alignof__ (struct pthread)

	/* This is the size we need before TCB. */
	# define TLS_PRE_TCB_SIZE \
	(sizeof (struct pthread) \
	+ ((sizeof (tcbhead_t) + TLS_TCB_ALIGN - 1) & ~(TLS_TCB_ALIGN - 1)))

	# ifndef __powerpc64__
	/* Register r2 (tp) is reserved by the ABI as "thread pointer". */
	register void *__thread_register __asm__ ("r2");
	# define PT_THREAD_POINTER PT_R2
	# else
	/* Register r13 (tp) is reserved by the ABI as "thread pointer". */
	register void *__thread_register __asm__ ("r13");
	# define PT_THREAD_POINTER PT_R13
	# endif

	/* The following assumes that TP (R2 or R13) points to the end of the
	TCB + 0x7000 (per the ABI). This implies that TCB address is
	TP - 0x7000. As we define TLS_DTV_AT_TP we can
	assume that the pthread struct is allocated immediately ahead of the
	TCB. This implies that the pthread_descr address is
	TP - (TLS_PRE_TCB_SIZE + 0x7000). */
	# define TLS_TCB_OFFSET 0x7000

	/* Install the dtv pointer. The pointer passed is to the element with
	index -1 which contain the length. */
	# define INSTALL_DTV(tcbp, dtvp) \
	((tcbhead_t *) (tcbp))[-1].dtv = dtvp + 1

	/* Install new dtv for current thread. */
	# define INSTALL_NEW_DTV(dtv) (THREAD_DTV() = (dtv))

	/* Return dtv of given thread descriptor. */
	# define GET_DTV(tcbp) (((tcbhead_t *) (tcbp))[-1].dtv)

	/* Code to initially initialize the thread pointer. This might need
	special attention since 'errno' is not yet available and if the
	operation can cause a failure 'errno' must not be touched. */
	# define TLS_INIT_TP(tcbp, secondcall) \
	(__thread_register = (void *) (tcbp) + TLS_TCB_OFFSET, NULL)

	/* Return the address of the dtv for the current thread. */
	# define THREAD_DTV() \
	(((tcbhead_t *) (__thread_register - TLS_TCB_OFFSET))[-1].dtv)

	/* Return the thread descriptor for the current thread. */
	# define THREAD_SELF \
	((struct pthread *) (__thread_register \
	- TLS_TCB_OFFSET - TLS_PRE_TCB_SIZE))

	/* Magic for libthread_db to know how to do THREAD_SELF. */
	# define DB_THREAD_SELF \
	REGISTER (32, 32, PT_THREAD_POINTER * 4, \
	- TLS_TCB_OFFSET - TLS_PRE_TCB_SIZE) \
	REGISTER (64, 64, PT_THREAD_POINTER * 8, \
	- TLS_TCB_OFFSET - TLS_PRE_TCB_SIZE)

	/* Read member of the thread descriptor directly. */
	# define THREAD_GETMEM(descr, member) ((void)(descr), (THREAD_SELF)->member)

	/* Same as THREAD_GETMEM, but the member offset can be non-constant. */
	# define THREAD_GETMEM_NC(descr, member, idx) \
	((void)(descr), (THREAD_SELF)->member[idx])

	/* Set member of the thread descriptor directly. */
	# define THREAD_SETMEM(descr, member, value) \
	((void)(descr), (THREAD_SELF)->member = (value))

	/* Same as THREAD_SETMEM, but the member offset can be non-constant. */
	# define THREAD_SETMEM_NC(descr, member, idx, value) \
	((void)(descr), (THREAD_SELF)->member[idx] = (value))

	/* Set the stack guard field in TCB head. */
	# define THREAD_SET_STACK_GUARD(value) \
	(((tcbhead_t ) ((char ) __thread_register \
	- TLS_TCB_OFFSET))[-1].stack_guard = (value))
	# define THREAD_COPY_STACK_GUARD(descr) \
	(((tcbhead_t ) ((char ) (descr) \
	+ TLS_PRE_TCB_SIZE))[-1].stack_guard \
	= ((tcbhead_t ) ((char ) __thread_register \
	- TLS_TCB_OFFSET))[-1].stack_guard)

	/* Set the stack guard field in TCB head. */
	# define THREAD_GET_POINTER_GUARD() \
	(((tcbhead_t ) ((char ) __thread_register \
	- TLS_TCB_OFFSET))[-1].pointer_guard)
	# define THREAD_SET_POINTER_GUARD(value) \
	(THREAD_GET_POINTER_GUARD () = (value))
	# define THREAD_COPY_POINTER_GUARD(descr) \
	(((tcbhead_t ) ((char ) (descr) \
	+ TLS_PRE_TCB_SIZE))[-1].pointer_guard \
	= THREAD_GET_POINTER_GUARD())

	/* l_tls_offset == 0 is perfectly valid on PPC, so we have to use some
	different value to mean unset l_tls_offset. */
	# define NO_TLS_OFFSET -1

	/* Get and set the global scope generation counter in struct pthread. */
	#define THREAD_GSCOPE_FLAG_UNUSED 0
	#define THREAD_GSCOPE_FLAG_USED 1
	#define THREAD_GSCOPE_FLAG_WAIT 2
	#define THREAD_GSCOPE_RESET_FLAG() \
	do \
	{ int __res \
	= atomic_exchange_rel (&THREAD_SELF->header.gscope_flag, \
	THREAD_GSCOPE_FLAG_UNUSED); \
	if (__res == THREAD_GSCOPE_FLAG_WAIT) \
	lll_futex_wake (&THREAD_SELF->header.gscope_flag, 1, LLL_PRIVATE); \
	} \
	while (0)
	#define THREAD_GSCOPE_SET_FLAG() \
	do \
	{ \
	THREAD_SELF->header.gscope_flag = THREAD_GSCOPE_FLAG_USED; \
	atomic_write_barrier (); \
	} \
	while (0)
	#define THREAD_GSCOPE_WAIT() \
	GL(dl_wait_lookup_done) ()

	#endif /* __ASSEMBLER__ */

	#endif /* tls.h */