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authorEric Andersen <andersen@codepoet.org>2005-05-20 19:02:51 +0000
committerEric Andersen <andersen@codepoet.org>2005-05-20 19:02:51 +0000
commit124af9f4b2b77b1510d88cfc8092c788d7e513c7 (patch)
treeccce720bef4c1c604417e2082cf9997a8d6dd7ab /libpthread/nptl/sysdeps/i386/tls.h
parent8028f35dbe29c5ace3883005e08ac91d873553b2 (diff)
Back out nptl changes, which for now will be done in branches/uClibc-nptl
Diffstat (limited to 'libpthread/nptl/sysdeps/i386/tls.h')
-rw-r--r--libpthread/nptl/sysdeps/i386/tls.h419
1 files changed, 0 insertions, 419 deletions
diff --git a/libpthread/nptl/sysdeps/i386/tls.h b/libpthread/nptl/sysdeps/i386/tls.h
deleted file mode 100644
index 06def42a5..000000000
--- a/libpthread/nptl/sysdeps/i386/tls.h
+++ /dev/null
@@ -1,419 +0,0 @@
-/* Definition for thread-local data handling. nptl/i386 version.
- Copyright (C) 2002, 2003, 2004 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>
-# include <stdlib.h>
-# include <list.h>
-
-
-/* Type for the dtv. */
-typedef union dtv
-{
- size_t counter;
- struct
- {
- void *val;
- bool is_static;
- } pointer;
-} dtv_t;
-
-
-typedef struct
-{
- void *tcb; /* Pointer to the TCB. Not necessarily the
- thread descriptor used by libpthread. */
- dtv_t *dtv;
- void *self; /* Pointer to the thread descriptor. */
- int multiple_threads;
- uintptr_t sysinfo;
-} tcbhead_t;
-
-# define TLS_MULTIPLE_THREADS_IN_TCB 1
-
-#else /* __ASSEMBLER__ */
-# include <tcb-offsets.h>
-#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. For IA-32 this is governed by
- the SSE memory functions. */
-#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(dtvp) \
- ({ struct pthread *__pd; \
- THREAD_SETMEM (__pd, header.dtv, (dtvp)); })
-
-/* Return dtv of given thread descriptor. */
-# define GET_DTV(descr) \
- (((tcbhead_t *) (descr))->dtv)
-
-#define THREAD_SELF_SYSINFO THREAD_GETMEM (THREAD_SELF, header.sysinfo)
-#define THREAD_SYSINFO(pd) ((pd)->header.sysinfo)
-
-/* 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
-
-#if defined NEED_DL_SYSINFO
-# define INIT_SYSINFO \
- _head->sysinfo = GLRO(dl_sysinfo)
-#else
-# define INIT_SYSINFO
-#endif
-
-#ifndef LOCK_PREFIX
-# ifdef UP
-# define LOCK_PREFIX /* nothing */
-# else
-# define LOCK_PREFIX "lock;"
-# endif
-#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. */
-# define TLS_INIT_TP(thrdescr, secondcall) \
- ({ void *_thrdescr = (thrdescr); \
- tcbhead_t *_head = _thrdescr; \
- union user_desc_init _segdescr; \
- int _result; \
- \
- _head->tcb = _thrdescr; \
- /* For now the thread descriptor is at the same address. */ \
- _head->self = _thrdescr; \
- /* New syscall handling support. */ \
- INIT_SYSINFO; \
- \
- /* The 'entry_number' field. Let the kernel pick a value. */ \
- if (secondcall) \
- _segdescr.vals[0] = TLS_GET_GS () >> 3; \
- else \
- _segdescr.vals[0] = -1; \
- /* The 'base_addr' field. Pointer to the TCB. */ \
- _segdescr.vals[1] = (unsigned long int) _thrdescr; \
- /* The 'limit' field. We use 4GB which is 0xfffff pages. */ \
- _segdescr.vals[2] = 0xfffff; \
- /* Collapsed value of the bitfield: \
- .seg_32bit = 1 \
- .contents = 0 \
- .read_exec_only = 0 \
- .limit_in_pages = 1 \
- .seg_not_present = 0 \
- .useable = 1 */ \
- _segdescr.vals[3] = 0x51; \
- \
- /* Install the TLS. */ \
- asm volatile (TLS_LOAD_EBX \
- "int $0x80\n\t" \
- TLS_LOAD_EBX \
- : "=a" (_result), "=m" (_segdescr.desc.entry_number) \
- : "0" (__NR_set_thread_area), \
- TLS_EBX_ARG (&_segdescr.desc), "m" (_segdescr.desc)); \
- \
- if (_result == 0) \
- /* We know the index in the GDT, now load the segment register. \
- The use of the GDT is described by the value 3 in the lower \
- three bits of the segment descriptor value. \
- \
- Note that we have to do this even if the numeric value of \
- the descriptor does not change. Loading the segment register \
- causes the segment information from the GDT to be loaded \
- which is necessary since we have changed it. */ \
- TLS_SET_GS (_segdescr.desc.entry_number * 8 + 3); \
- \
- _result == 0 ? NULL \
- : "set_thread_area failed when setting up thread-local storage\n"; })
-
-
-/* Return the address of the dtv for the current thread. */
-# define THREAD_DTV() \
- ({ struct pthread *__pd; \
- THREAD_GETMEM (__pd, header.dtv); })
-
-
-/* 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 ("movl %%gs:%c1,%0" : "=r" (__self) \
- : "i" (offsetof (struct pthread, header.self))); \
- __self;})
-
-/* Magic for libthread_db to know how to do THREAD_SELF. */
-# define DB_THREAD_SELF \
- REGISTER_THREAD_AREA (32, offsetof (struct user_regs_struct, xgs), 3) \
- REGISTER_THREAD_AREA (64, 26 * 8, 3) /* x86-64's user_regs_struct->gs */
-
-
-/* Read member of the thread descriptor directly. */
-# define THREAD_GETMEM(descr, member) \
- ({ __typeof (descr->member) __value; \
- if (sizeof (__value) == 1) \
- asm volatile ("movb %%gs:%P2,%b0" \
- : "=q" (__value) \
- : "0" (0), "i" (offsetof (struct pthread, member))); \
- else if (sizeof (__value) == 4) \
- asm volatile ("movl %%gs:%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 volatile ("movl %%gs:%P1,%%eax\n\t" \
- "movl %%gs:%P2,%%edx" \
- : "=A" (__value) \
- : "i" (offsetof (struct pthread, member)), \
- "i" (offsetof (struct pthread, member) + 4)); \
- } \
- __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 volatile ("movb %%gs:%P2(%3),%b0" \
- : "=q" (__value) \
- : "0" (0), "i" (offsetof (struct pthread, member[0])), \
- "r" (idx)); \
- else if (sizeof (__value) == 4) \
- asm volatile ("movl %%gs:%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 volatile ("movl %%gs:%P1(,%2,8),%%eax\n\t" \
- "movl %%gs:4+%P1(,%2,8),%%edx" \
- : "=&A" (__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 %b0,%%gs:%P1" : \
- : "iq" (value), \
- "i" (offsetof (struct pthread, member))); \
- else if (sizeof (descr->member) == 4) \
- asm volatile ("movl %0,%%gs:%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 ("movl %%eax,%%gs:%P1\n\t" \
- "movl %%edx,%%gs:%P2" : \
- : "A" (value), \
- "i" (offsetof (struct pthread, member)), \
- "i" (offsetof (struct pthread, member) + 4)); \
- }})
-
-
-/* Set member of the thread descriptor directly. */
-# define THREAD_SETMEM_NC(descr, member, idx, value) \
- ({ if (sizeof (descr->member[0]) == 1) \
- asm volatile ("movb %b0,%%gs:%P1(%2)" : \
- : "iq" (value), \
- "i" (offsetof (struct pthread, member)), \
- "r" (idx)); \
- else if (sizeof (descr->member[0]) == 4) \
- asm volatile ("movl %0,%%gs:%P1(,%2,4)" : \
- : "ir" (value), \
- "i" (offsetof (struct pthread, member)), \
- "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 ("movl %%eax,%%gs:%P1(,%2,8)\n\t" \
- "movl %%edx,%%gs:4+%P1(,%2,8)" : \
- : "A" (value), \
- "i" (offsetof (struct pthread, member)), \
- "r" (idx)); \
- }})
-
-
-/* Atomic compare and exchange on TLS, returning old value. */
-#define THREAD_ATOMIC_CMPXCHG_VAL(descr, member, newval, oldval) \
- ({ __typeof (descr->member) __ret; \
- __typeof (oldval) __old = (oldval); \
- if (sizeof (descr->member) == 4) \
- asm volatile (LOCK_PREFIX "cmpxchgl %2, %%gs:%P3" \
- : "=a" (__ret) \
- : "0" (__old), "r" (newval), \
- "i" (offsetof (struct pthread, member))); \
- else \
- /* Not necessary for other sizes in the moment. */ \
- abort (); \
- __ret; })
-
-
-/* Atomic set bit. */
-#define THREAD_ATOMIC_BIT_SET(descr, member, bit) \
- (void) ({ if (sizeof ((descr)->member) == 4) \
- asm volatile (LOCK_PREFIX "orl %1, %%gs:%P0" \
- :: "i" (offsetof (struct pthread, member)), \
- "ir" (1 << (bit))); \
- else \
- /* Not necessary for other sizes in the moment. */ \
- abort (); })
-
-
-/* Call the user-provided thread function. */
-#define CALL_THREAD_FCT(descr) \
- ({ void *__res; \
- int __ignore1, __ignore2; \
- asm volatile ("pushl %%eax\n\t" \
- "pushl %%eax\n\t" \
- "pushl %%eax\n\t" \
- "pushl %%gs:%P4\n\t" \
- "call *%%gs:%P3\n\t" \
- "addl $16, %%esp" \
- : "=a" (__res), "=c" (__ignore1), "=d" (__ignore2) \
- : "i" (offsetof (struct pthread, start_routine)), \
- "i" (offsetof (struct pthread, arg))); \
- __res; })
-
-
-#endif /* __ASSEMBLER__ */
-
-#endif /* tls.h */