mirror of
https://sourceware.org/git/glibc.git
synced 2024-11-27 07:20:11 +00:00
a5df0318ef
* elf/dl-support.c [!THREAD_GSCOPE_IN_TCB] (_dl_thread_gscope_count): Define variable. * sysdeps/generic/ldsodefs.h [!THREAD_GSCOPE_IN_TCB] (struct rtld_global): Add _dl_thread_gscope_count member. * sysdeps/mach/hurd/tls.h: Include <atomic.h>. [!defined __ASSEMBLER__] (THREAD_GSCOPE_GLOBAL, THREAD_GSCOPE_SET_FLAG, THREAD_GSCOPE_RESET_FLAG, THREAD_GSCOPE_WAIT): Define macros. * sysdeps/generic/tls.h: Document THREAD_GSCOPE_IN_TCB. * sysdeps/aarch64/nptl/tls.h: Define THREAD_GSCOPE_IN_TCB to 1. * sysdeps/alpha/nptl/tls.h: Define THREAD_GSCOPE_IN_TCB to 1. * sysdeps/arm/nptl/tls.h: Define THREAD_GSCOPE_IN_TCB to 1. * sysdeps/hppa/nptl/tls.h: Define THREAD_GSCOPE_IN_TCB to 1. * sysdeps/i386/nptl/tls.h: Define THREAD_GSCOPE_IN_TCB to 1. * sysdeps/ia64/nptl/tls.h: Define THREAD_GSCOPE_IN_TCB to 1. * sysdeps/m68k/nptl/tls.h: Define THREAD_GSCOPE_IN_TCB to 1. * sysdeps/microblaze/nptl/tls.h: Define THREAD_GSCOPE_IN_TCB to 1. * sysdeps/mips/nptl/tls.h: Define THREAD_GSCOPE_IN_TCB to 1. * sysdeps/nios2/nptl/tls.h: Define THREAD_GSCOPE_IN_TCB to 1. * sysdeps/powerpc/nptl/tls.h: Define THREAD_GSCOPE_IN_TCB to 1. * sysdeps/riscv/nptl/tls.h: Define THREAD_GSCOPE_IN_TCB to 1. * sysdeps/s390/nptl/tls.h: Define THREAD_GSCOPE_IN_TCB to 1. * sysdeps/sh/nptl/tls.h: Define THREAD_GSCOPE_IN_TCB to 1. * sysdeps/sparc/nptl/tls.h: Define THREAD_GSCOPE_IN_TCB to 1. * sysdeps/tile/nptl/tls.h: Define THREAD_GSCOPE_IN_TCB to 1. * sysdeps/x86_64/nptl/tls.h: Define THREAD_GSCOPE_IN_TCB to 1.
437 lines
15 KiB
C
437 lines
15 KiB
C
/* Definition for thread-local data handling. nptl/i386 version.
|
|
Copyright (C) 2002-2018 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, see
|
|
<http://www.gnu.org/licenses/>. */
|
|
|
|
#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 <sysdep.h>
|
|
# include <libc-pointer-arith.h> /* For cast_to_integer. */
|
|
# include <kernel-features.h>
|
|
# include <dl-dtv.h>
|
|
|
|
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;
|
|
uintptr_t stack_guard;
|
|
uintptr_t pointer_guard;
|
|
int gscope_flag;
|
|
#ifndef __ASSUME_PRIVATE_FUTEX
|
|
int private_futex;
|
|
#else
|
|
int __glibc_reserved1;
|
|
#endif
|
|
/* Reservation of some values for the TM ABI. */
|
|
void *__private_tm[4];
|
|
/* GCC split stack support. */
|
|
void *__private_ss;
|
|
} tcbhead_t;
|
|
|
|
# define TLS_MULTIPLE_THREADS_IN_TCB 1
|
|
|
|
#else /* __ASSEMBLER__ */
|
|
# include <tcb-offsets.h>
|
|
#endif
|
|
|
|
|
|
/* 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];
|
|
};
|
|
|
|
|
|
/* This is the size of the initial TCB. Can't be just sizeof (tcbhead_t),
|
|
because NPTL getpid, __libc_alloca_cutoff etc. need (almost) the whole
|
|
struct pthread even when not linked with -lpthread. */
|
|
# define TLS_INIT_TCB_SIZE sizeof (struct pthread)
|
|
|
|
/* 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 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
|
|
# define TLS_DTV_AT_TP 0
|
|
|
|
/* Get the thread descriptor definition. */
|
|
# include <nptl/descr.h>
|
|
|
|
|
|
/* 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)
|
|
|
|
/* 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
|
|
|
|
#ifdef NEED_DL_SYSINFO
|
|
# define INIT_SYSINFO \
|
|
_head->sysinfo = GLRO(dl_sysinfo)
|
|
# define SETUP_THREAD_SYSINFO(pd) \
|
|
((pd)->header.sysinfo = THREAD_GETMEM (THREAD_SELF, header.sysinfo))
|
|
# define CHECK_THREAD_SYSINFO(pd) \
|
|
assert ((pd)->header.sysinfo == THREAD_GETMEM (THREAD_SELF, header.sysinfo))
|
|
#else
|
|
# define INIT_SYSINFO
|
|
#endif
|
|
|
|
#ifndef LOCK_PREFIX
|
|
# ifdef UP
|
|
# define LOCK_PREFIX /* nothing */
|
|
# else
|
|
# define LOCK_PREFIX "lock;"
|
|
# endif
|
|
#endif
|
|
|
|
static inline void __attribute__ ((unused, always_inline))
|
|
tls_fill_user_desc (union user_desc_init *desc,
|
|
unsigned int entry_number,
|
|
void *pd)
|
|
{
|
|
desc->vals[0] = entry_number;
|
|
/* The 'base_addr' field. Pointer to the TCB. */
|
|
desc->vals[1] = (unsigned long int) pd;
|
|
/* The 'limit' field. We use 4GB which is 0xfffff pages. */
|
|
desc->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 */
|
|
desc->vals[3] = 0x51;
|
|
}
|
|
|
|
/* 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) \
|
|
({ 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; \
|
|
\
|
|
/* Let the kernel pick a value for the 'entry_number' field. */ \
|
|
tls_fill_user_desc (&_segdescr, -1, _thrdescr); \
|
|
\
|
|
/* Install the TLS. */ \
|
|
INTERNAL_SYSCALL_DECL (err); \
|
|
_result = INTERNAL_SYSCALL (set_thread_area, err, 1, &_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"; })
|
|
|
|
# define TLS_DEFINE_INIT_TP(tp, pd) \
|
|
union user_desc_init _segdescr; \
|
|
/* Find the 'entry_number' field that the kernel selected in TLS_INIT_TP. \
|
|
The first three bits of the segment register value select the GDT, \
|
|
ignore them. We get the index from the value of the %gs register in \
|
|
the current thread. */ \
|
|
tls_fill_user_desc (&_segdescr, TLS_GET_GS () >> 3, pd); \
|
|
const struct user_desc *tp = &_segdescr.desc
|
|
|
|
|
|
/* 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; })
|
|
|
|
|
|
|
|
/* Set member of the thread descriptor directly. */
|
|
# 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" ((uint64_t) cast_to_integer (value)), \
|
|
"i" (offsetof (struct pthread, member)), \
|
|
"i" (offsetof (struct pthread, member) + 4)); \
|
|
}})
|
|
|
|
|
|
/* Same as THREAD_SETMEM, but the member offset can be non-constant. */
|
|
# 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" ((uint64_t) cast_to_integer (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 logical and. */
|
|
#define THREAD_ATOMIC_AND(descr, member, val) \
|
|
(void) ({ if (sizeof ((descr)->member) == 4) \
|
|
asm volatile (LOCK_PREFIX "andl %1, %%gs:%P0" \
|
|
:: "i" (offsetof (struct pthread, member)), \
|
|
"ir" (val)); \
|
|
else \
|
|
/* Not necessary for other sizes in the moment. */ \
|
|
abort (); })
|
|
|
|
|
|
/* 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 (); })
|
|
|
|
|
|
/* Set the stack guard field in TCB head. */
|
|
#define THREAD_SET_STACK_GUARD(value) \
|
|
THREAD_SETMEM (THREAD_SELF, header.stack_guard, value)
|
|
#define THREAD_COPY_STACK_GUARD(descr) \
|
|
((descr)->header.stack_guard \
|
|
= THREAD_GETMEM (THREAD_SELF, header.stack_guard))
|
|
|
|
|
|
/* Set the pointer guard field in the TCB head. */
|
|
#define THREAD_SET_POINTER_GUARD(value) \
|
|
THREAD_SETMEM (THREAD_SELF, header.pointer_guard, value)
|
|
#define THREAD_COPY_POINTER_GUARD(descr) \
|
|
((descr)->header.pointer_guard \
|
|
= THREAD_GETMEM (THREAD_SELF, header.pointer_guard))
|
|
|
|
|
|
/* Get and set the global scope generation counter in the TCB head. */
|
|
#define THREAD_GSCOPE_IN_TCB 1
|
|
#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; \
|
|
asm volatile ("xchgl %0, %%gs:%P1" \
|
|
: "=r" (__res) \
|
|
: "i" (offsetof (struct pthread, header.gscope_flag)), \
|
|
"0" (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() \
|
|
THREAD_SETMEM (THREAD_SELF, header.gscope_flag, THREAD_GSCOPE_FLAG_USED)
|
|
#define THREAD_GSCOPE_WAIT() \
|
|
GL(dl_wait_lookup_done) ()
|
|
|
|
#endif /* __ASSEMBLER__ */
|
|
|
|
#endif /* tls.h */
|