/* Definition for thread-local data handling. nptl/x86_64 version.
- Copyright (C) 2002 Free Software Foundation, Inc.
+ Copyright (C) 2002-2014 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
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. */
+ License along with the GNU C Library; if not, see
+ <http://www.gnu.org/licenses/>. */
#ifndef _TLS_H
#define _TLS_H 1
#ifndef __ASSEMBLER__
+# include <asm/prctl.h> /* For ARCH_SET_FS. */
+# include <stdbool.h>
# include <stddef.h>
# include <stdint.h>
+# include <stdlib.h>
+# include <sysdep.h>
+# include <libc-internal.h>
+# include <kernel-features.h>
+
+/* Replacement type for __m128 since this file is included by ld.so,
+ which is compiled with -mno-sse. It must not change the alignment
+ of rtld_savespace_sse. */
+typedef struct
+{
+ int i[4];
+} __128bits;
/* Type for the dtv. */
typedef union dtv
{
size_t counter;
- void *pointer;
+ struct
+ {
+ void *val;
+ bool is_static;
+ } pointer;
} dtv_t;
typedef struct
{
- void *tcb; /* Pointer to the TCB. Not necessary the
+ 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;
+ int gscope_flag;
+ uintptr_t sysinfo;
+ uintptr_t stack_guard;
+ uintptr_t pointer_guard;
+ unsigned long int vgetcpu_cache[2];
+# ifndef __ASSUME_PRIVATE_FUTEX
+ int private_futex;
+# else
+ int __glibc_reserved1;
+# endif
+ int rtld_must_xmm_save;
+ /* Reservation of some values for the TM ABI. */
+ void *__private_tm[4];
+ /* GCC split stack support. */
+ void *__private_ss;
+ long int __glibc_reserved2;
+ /* Have space for the post-AVX register size. */
+ __128bits rtld_savespace_sse[8][4] __attribute__ ((aligned (32)));
+
+ void *__padding[8];
} tcbhead_t;
-#endif
-
-/* We require TLS support in the tools. */
-#ifndef HAVE_TLS_SUPPORT
-# error "TLS support is required."
+#else /* __ASSEMBLER__ */
+# include <tcb-offsets.h>
#endif
-/* Signal that TLS support is available. */
-#define USE_TLS 1
/* Alignment requirement for the stack. */
#define STACK_ALIGN 16
/* 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>
+#ifndef LOCK_PREFIX
+# ifdef UP
+# define LOCK_PREFIX /* nothing */
+# else
+# define LOCK_PREFIX "lock;"
+# endif
+#endif
-/* This is the size of the initial TCB. */
-# define TLS_INIT_TCB_SIZE sizeof (tcbhead_t)
+/* 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__ (tcbhead_t)
+# define TLS_INIT_TCB_ALIGN __alignof__ (struct pthread)
/* This is the size of the TCB. */
# define TLS_TCB_SIZE sizeof (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
+ ((tcbhead_t *) (descr))->dtv = (dtvp) + 1
/* Install new dtv for current thread. */
-# define INSTALL_NEW_DTV(dtv) \
+# define INSTALL_NEW_DTV(dtvp) \
({ struct pthread *__pd; \
- THREAD_SETMEM (__pd, header.data.dtvp, dtv); })
+ 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
-
-
-# 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.
: "=a" (_result) \
: "0" ((unsigned long int) __NR_arch_prctl), \
"D" ((unsigned long int) ARCH_SET_FS), \
- "S" (_descr) \
+ "S" (_thrdescr) \
: "memory", "cc", "r11", "cx"); \
\
- _result ? -1 : 0; })
+ _result ? "cannot set %fs base address for thread-local storage" : 0; \
+ })
/* Return the address of the dtv for the current thread. */
# define THREAD_DTV() \
({ struct pthread *__pd; \
- THREAD_GETMEM (__pd, header.data.dtvp); })
+ 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();
+ 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))); \
+ asm ("mov %%fs:%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_INCLUDE <sys/reg.h> /* For the FS constant. */
+# define DB_THREAD_SELF CONST_THREAD_AREA (64, FS)
/* 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))); \
+ asm volatile ("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))); \
+ asm volatile ("movl %%fs:%P1,%0" \
+ : "=r" (__value) \
+ : "i" (offsetof (struct pthread, member))); \
else \
{ \
if (sizeof (__value) != 8) \
4 or 8. */ \
abort (); \
\
- asm ("movq %%fs:%P1,%0" \
- : "=r" (__value) \
- : "i" (offsetof (struct pthread, member))); \
+ asm volatile ("movq %%fs:%P1,%q0" \
+ : "=r" (__value) \
+ : "i" (offsetof (struct pthread, member))); \
} \
__value; })
# 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)); \
+ asm volatile ("movb %%fs:%P2(%q3),%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)); \
+ asm volatile ("movl %%fs:%P1(,%q2,4),%0" \
+ : "=r" (__value) \
+ : "i" (offsetof (struct pthread, member[0])), "r" (idx));\
else \
{ \
if (sizeof (__value) != 8) \
4 or 8. */ \
abort (); \
\
- asm ("movq %%fs:%P1(,%2,8),%0" \
- : "=r" (__value) \
- : "i" (offsetof (struct pthread, member[0])), "r" (idx)); \
+ asm volatile ("movq %%fs:%P1(,%q2,8),%q0" \
+ : "=r" (__value) \
+ : "i" (offsetof (struct pthread, member[0])), \
+ "r" (idx)); \
} \
__value; })
+/* Loading addresses of objects on x86-64 needs to be treated special
+ when generating PIC code. */
+#ifdef __pic__
+# define IMM_MODE "nr"
+#else
+# define IMM_MODE "ir"
+#endif
+
+
/* 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" : \
+ asm volatile ("movb %b0,%%fs:%P1" : \
: "iq" (value), \
"i" (offsetof (struct pthread, member))); \
else if (sizeof (descr->member) == 4) \
asm volatile ("movl %0,%%fs:%P1" : \
- : "ir" (value), \
+ : IMM_MODE (value), \
"i" (offsetof (struct pthread, member))); \
else \
{ \
4 or 8. */ \
abort (); \
\
- asm volatile ("movq %0,%%fs:%P1" : \
- : "ir" ((unsigned long int) value), \
+ asm volatile ("movq %q0,%%fs:%P1" : \
+ : IMM_MODE ((uint64_t) cast_to_integer (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)" : \
+ asm volatile ("movb %b0,%%fs:%P1(%q2)" : \
: "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), \
+ asm volatile ("movl %0,%%fs:%P1(,%q2,4)" : \
+ : IMM_MODE (value), \
"i" (offsetof (struct pthread, member[0])), \
"r" (idx)); \
else \
4 or 8. */ \
abort (); \
\
- asm volatile ("movq %0,%%fs:%P1(,%2,8)" : \
- : "r" ((unsigned long int) value), \
+ asm volatile ("movq %q0,%%fs:%P1(,%q2,8)" : \
+ : IMM_MODE ((uint64_t) cast_to_integer (value)), \
"i" (offsetof (struct pthread, member[0])), \
"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, %%fs:%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, %%fs:%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, %%fs:%P0" \
+ :: "i" (offsetof (struct pthread, member)), \
+ "ir" (1 << (bit))); \
+ else \
+ /* Not necessary for other sizes in the moment. */ \
+ abort (); })
+
+
+# define CALL_THREAD_FCT(descr) \
+ ({ void *__res; \
+ asm volatile ("movq %%fs:%P2, %%rdi\n\t" \
+ "callq *%%fs:%P1" \
+ : "=a" (__res) \
+ : "i" (offsetof (struct pthread, start_routine)), \
+ "i" (offsetof (struct pthread, arg)) \
+ : "di", "si", "cx", "dx", "r8", "r9", "r10", "r11", \
+ "memory", "cc"); \
+ __res; })
+
+
+/* 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_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, %%fs:%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) ()
+
+
+# ifdef SHARED
+/* Defined in dl-trampoline.S. */
+extern void _dl_x86_64_save_sse (void);
+extern void _dl_x86_64_restore_sse (void);
+
+# define RTLD_CHECK_FOREIGN_CALL \
+ (THREAD_GETMEM (THREAD_SELF, header.rtld_must_xmm_save) != 0)
+
+/* NB: Don't use the xchg operation because that would imply a lock
+ prefix which is expensive and unnecessary. The cache line is also
+ not contested at all. */
+# define RTLD_ENABLE_FOREIGN_CALL \
+ int old_rtld_must_xmm_save = THREAD_GETMEM (THREAD_SELF, \
+ header.rtld_must_xmm_save); \
+ THREAD_SETMEM (THREAD_SELF, header.rtld_must_xmm_save, 1)
+
+# define RTLD_PREPARE_FOREIGN_CALL \
+ do if (THREAD_GETMEM (THREAD_SELF, header.rtld_must_xmm_save)) \
+ { \
+ _dl_x86_64_save_sse (); \
+ THREAD_SETMEM (THREAD_SELF, header.rtld_must_xmm_save, 0); \
+ } \
+ while (0)
+
+# define RTLD_FINALIZE_FOREIGN_CALL \
+ do { \
+ if (THREAD_GETMEM (THREAD_SELF, header.rtld_must_xmm_save) == 0) \
+ _dl_x86_64_restore_sse (); \
+ THREAD_SETMEM (THREAD_SELF, header.rtld_must_xmm_save, \
+ old_rtld_must_xmm_save); \
+ } while (0)
+# endif
+
+
#endif /* __ASSEMBLER__ */
#endif /* tls.h */
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