--- /dev/null
+/* Definition for thread-local data handling. nptl/x86_64 version.
+ Copyright (C) 2002 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
+
+#ifndef __ASSEMBLER__
+# include <stddef.h>
+# include <stdint.h>
+
+
+/* Type for the dtv. */
+typedef union dtv
+{
+ size_t counter;
+ void *pointer;
+} dtv_t;
+
+
+typedef struct
+{
+ void *tcb; /* Pointer to the TCB. Not necessary the
+ thread descriptor used by libpthread. */
+ dtv_t *dtv;
+ void *self; /* Pointer to the thread descriptor. */
+} tcbhead_t;
+#endif
+
+
+/* We require TLS support in the tools. */
+#ifndef HAVE_TLS_SUPPORT
+# error "TLS support is required."
+#endif
+
+/* Signal that TLS support is available. */
+#define USE_TLS 1
+
+/* Alignment requirement for the stack. */
+#define STACK_ALIGN 16
+
+
+#ifndef __ASSEMBLER__
+/* Get system call information. */
+# include <sysdep.h>
+
+/* The old way: using LDT. */
+
+/* Structure passed to `modify_ldt', 'set_thread_area', and 'clone' calls. */
+struct user_desc
+{
+ unsigned int entry_number;
+ unsigned long int base_addr;
+ unsigned int limit;
+ unsigned int seg_32bit:1;
+ unsigned int contents:2;
+ unsigned int read_exec_only:1;
+ unsigned int limit_in_pages:1;
+ unsigned int seg_not_present:1;
+ unsigned int useable:1;
+ unsigned int empty:25;
+};
+
+/* Initializing bit fields is slow. We speed it up by using a union. */
+union user_desc_init
+{
+ struct user_desc desc;
+ unsigned int vals[4];
+};
+
+
+/* Get the thread descriptor definition. */
+# include <nptl/descr.h>
+
+/* This is the size of the initial TCB. */
+# define TLS_INIT_TCB_SIZE sizeof (tcbhead_t)
+
+/* Alignment requirements for the initial TCB. */
+# define TLS_INIT_TCB_ALIGN __alignof__ (tcbhead_t)
+
+/* This is the size of the TCB. */
+# define TLS_TCB_SIZE sizeof (struct pthread)
+
+/* Alignment requirements for the TCB. */
+# define TLS_TCB_ALIGN __alignof__ (struct pthread)
+
+/* The TCB can have any size and the memory following the address the
+ thread pointer points to is unspecified. Allocate the TCB there. */
+# define TLS_TCB_AT_TP 1
+
+
+/* Install the dtv pointer. The pointer passed is to the element with
+ index -1 which contain the length. */
+# define INSTALL_DTV(descr, dtvp) \
+ ((tcbhead_t *) (descr))->dtv = dtvp + 1
+
+/* Install new dtv for current thread. */
+# define INSTALL_NEW_DTV(dtv) \
+ ({ struct pthread *__pd; \
+ THREAD_SETMEM (__pd, header.data.dtvp, dtv); })
+
+/* Return dtv of given thread descriptor. */
+# define GET_DTV(descr) \
+ (((tcbhead_t *) (descr))->dtv)
+
+
+/* Macros to load from and store into segment registers. */
+# ifndef TLS_GET_GS
+# define TLS_GET_GS() \
+ ({ int __seg; __asm ("movw %%gs, %w0" : "=q" (__seg)); __seg & 0xffff; })
+# endif
+# ifndef TLS_SET_GS
+# define TLS_SET_GS(val) \
+ __asm ("movw %w0, %%gs" :: "q" (val))
+# endif
+
+
+# ifndef __NR_set_thread_area
+# define __NR_set_thread_area 243
+# endif
+# ifndef TLS_FLAG_WRITABLE
+# define TLS_FLAG_WRITABLE 0x00000001
+# endif
+
+// XXX Enable for the real world.
+#if 0
+# ifndef __ASSUME_SET_THREAD_AREA
+# error "we need set_thread_area"
+# endif
+#endif
+
+# ifdef __PIC__
+# define TLS_EBX_ARG "r"
+# define TLS_LOAD_EBX "xchgl %3, %%ebx\n\t"
+# else
+# define TLS_EBX_ARG "b"
+# define TLS_LOAD_EBX
+# endif
+
+/* 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.
+
+ We have to make the syscall for both uses of the macro since the
+ address might be (and probably is) different. */
+# define TLS_INIT_TP(thrdescr, secondcall) \
+ ({ void *_thrdescr = (thrdescr); \
+ tcbhead_t *_head = _thrdescr; \
+ int _result; \
+ \
+ _head->tcb = _thrdescr; \
+ /* For now the thread descriptor is at the same address. */ \
+ _head->self = _thrdescr; \
+ \
+ /* It is a simple syscall to set the %fs value for the thread. */ \
+ asm volatile ("syscall" \
+ : "=a" (_result) \
+ : "0" ((unsigned long int) __NR_arch_prctl), \
+ "D" ((unsigned long int) ARCH_SET_FS), \
+ "S" (_descr) \
+ : "memory", "cc", "r11", "cx"); \
+ \
+ _result ? -1 : 0; })
+
+
+/* Return the address of the dtv for the current thread. */
+# define THREAD_DTV() \
+ ({ struct pthread *__pd; \
+ THREAD_GETMEM (__pd, header.data.dtvp); })
+
+
+/* Return the thread descriptor for the current thread.
+
+ The contained asm must *not* be marked volatile since otherwise
+ assignments like
+ pthread_descr self = thread_self();
+ do not get optimized away. */
+# define THREAD_SELF \
+ ({ struct pthread *__self; \
+ asm ("movq %%fs:%c1,%0" : "=r" (__self) \
+ : "i" (offsetof (struct pthread, header.data.self))); \
+ __self;})
+
+
+/* Read member of the thread descriptor directly. */
+# define THREAD_GETMEM(descr, member) \
+ ({ __typeof (descr->member) __value; \
+ if (sizeof (__value) == 1) \
+ asm ("movb %%fs:%P2,%b0" \
+ : "=q" (__value) \
+ : "0" (0), "i" (offsetof (struct pthread, member))); \
+ else if (sizeof (__value) == 4) \
+ asm ("movl %%fs:%P1,%0" \
+ : "=r" (__value) \
+ : "i" (offsetof (struct pthread, member))); \
+ else \
+ { \
+ if (sizeof (__value) != 8) \
+ /* There should not be any value with a size other than 1, \
+ 4 or 8. */ \
+ abort (); \
+ \
+ asm ("movq %%fs:%P1,%0" \
+ : "=r" (__value) \
+ : "i" (offsetof (struct pthread, member))); \
+ } \
+ __value; })
+
+
+/* Same as THREAD_GETMEM, but the member offset can be non-constant. */
+# define THREAD_GETMEM_NC(descr, member, idx) \
+ ({ __typeof (descr->member[0]) __value; \
+ if (sizeof (__value) == 1) \
+ asm ("movb %%fs:%P2(%3),%b0" \
+ : "=q" (__value) \
+ : "0" (0), "i" (offsetof (struct pthread, member[0])), \
+ "r" (idx)); \
+ else if (sizeof (__value) == 4) \
+ asm ("movl %%fs:%P1(,%2,4),%0" \
+ : "=r" (__value) \
+ : "i" (offsetof (struct pthread, member[0])), "r" (idx)); \
+ else \
+ { \
+ if (sizeof (__value) != 8) \
+ /* There should not be any value with a size other than 1, \
+ 4 or 8. */ \
+ abort (); \
+ \
+ asm ("movq %%fs:%P1(,%2,8),%0" \
+ : "=r" (__value) \
+ : "i" (offsetof (struct pthread, member[0])), "r" (idx)); \
+ } \
+ __value; })
+
+
+/* Same as THREAD_SETMEM, but the member offset can be non-constant. */
+# define THREAD_SETMEM(descr, member, value) \
+ ({ if (sizeof (descr->member) == 1) \
+ asm volatile ("movb %0,%%fs:%P1" : \
+ : "iq" (value), \
+ "i" (offsetof (struct pthread, member))); \
+ else if (sizeof (descr->member) == 4) \
+ asm volatile ("movl %0,%%fs:%P1" : \
+ : "ir" (value), \
+ "i" (offsetof (struct pthread, member))); \
+ else \
+ { \
+ if (sizeof (descr->member) != 8) \
+ /* There should not be any value with a size other than 1, \
+ 4 or 8. */ \
+ abort (); \
+ \
+ asm volatile ("movq %0,%%fs:%P1" : \
+ : "ir" ((unsigned long int) value), \
+ "i" (offsetof (struct pthread, member))); \
+ }})
+
+
+/* Set member of the thread descriptor directly. */
+# define THREAD_SETMEM_NC(descr, member, idx, value) \
+ ({ if (sizeof (descr->member[0]) == 1) \
+ asm volatile ("movb %0,%%fs:%P1(%2)" : \
+ : "iq" (value), \
+ "i" (offsetof (struct pthread, member[0])), \
+ "r" (idx)); \
+ else if (sizeof (descr->member[0]) == 4) \
+ asm volatile ("movl %0,%%fs:%P1(,%2,4)" : \
+ : "ir" (value), \
+ "i" (offsetof (struct pthread, member[0])), \
+ "r" (idx)); \
+ else \
+ { \
+ if (sizeof (descr->member[0]) != 8) \
+ /* There should not be any value with a size other than 1, \
+ 4 or 8. */ \
+ abort (); \
+ \
+ asm volatile ("movq %0,%%fs:%P1(,%2,8)" : \
+ : "r" ((unsigned long int) value), \
+ "i" (offsetof (struct pthread, member[0])), \
+ "r" (idx)); \
+ }})
+
+
+#endif /* __ASSEMBLER__ */
+
+#endif /* tls.h */
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