mirror of
https://sourceware.org/git/glibc.git
synced 2024-11-25 14:30:06 +00:00
Update.
2002-11-27 Ulrich Drepper <drepper@redhat.com> * sysdeps/x86_64/tls.h: New file.
This commit is contained in:
Ulrich Drepper
parent
117c452c98
commit
a39313366a
@ -1,3 +1,7 @@
|
||||
2002-11-27 Ulrich Drepper <drepper@redhat.com>
|
||||
|
||||
* sysdeps/x86_64/tls.h: New file.
|
||||
|
||||
2002-11-26 Ulrich Drepper <drepper@redhat.com>
|
||||
|
||||
* sysdeps/i386/tls.h (THREAD_GETMEM_NC): Change interface. It now
|
||||
|
||||
302
nptl/sysdeps/x86_64/tls.h
Normal file
302
nptl/sysdeps/x86_64/tls.h
Normal file
@ -0,0 +1,302 @@
|
||||
/* 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 */
|
||||
Loading…
Reference in New Issue
Block a user