diff options
Diffstat (limited to 'libpthread/nptl/sysdeps/x86_64/tls.h')
| -rw-r--r-- | libpthread/nptl/sysdeps/x86_64/tls.h | 334 |
1 files changed, 334 insertions, 0 deletions
diff --git a/libpthread/nptl/sysdeps/x86_64/tls.h b/libpthread/nptl/sysdeps/x86_64/tls.h new file mode 100644 index 000000000..516827b8e --- /dev/null +++ b/libpthread/nptl/sysdeps/x86_64/tls.h @@ -0,0 +1,334 @@ +/* Definition for thread-local data handling. nptl/x86_64 version. + Copyright (C) 2002, 2003, 2004, 2005 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 <asm/prctl.h> /* For ARCH_SET_FS. */ +#ifndef __ASSEMBLER__ +# include <stdbool.h> +# include <stddef.h> +# include <stdint.h> +# include <stdlib.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 necessary 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; +} tcbhead_t; + +#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. */ +#define STACK_ALIGN 16 + + +#ifndef __ASSEMBLER__ +/* Get system call information. */ +# include <sysdep.h> + + +/* 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. 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 + + +/* 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. */ +# define TLS_GET_FS() \ + ({ int __seg; __asm ("movl %%fs, %0" : "=q" (__seg)); __seg; }) +# define TLS_SET_FS(val) \ + __asm ("movl %0, %%fs" :: "q" (val)) + + +/* 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" (_thrdescr) \ + : "memory", "cc", "r11", "cx"); \ + \ + _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.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 ("movq %%fs:%c1,%q0" : "=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 volatile ("movb %%fs:%P2,%b0" \ + : "=q" (__value) \ + : "0" (0), "i" (offsetof (struct pthread, member))); \ + else if (sizeof (__value) == 4) \ + asm volatile ("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 volatile ("movq %%fs:%P1,%q0" \ + : "=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 volatile ("movb %%fs:%P2(%q3),%b0" \ + : "=q" (__value) \ + : "0" (0), "i" (offsetof (struct pthread, member[0])), \ + "r" (idx)); \ + else if (sizeof (__value) == 4) \ + asm volatile ("movl %%fs:%P1(,%q2,4),%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 ("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 %b0,%%fs:%P1" : \ + : "iq" (value), \ + "i" (offsetof (struct pthread, member))); \ + else if (sizeof (descr->member) == 4) \ + asm volatile ("movl %0,%%fs:%P1" : \ + : IMM_MODE (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 %q0,%%fs:%P1" : \ + : IMM_MODE ((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 %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(,%q2,4)" : \ + : IMM_MODE (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 %q0,%%fs:%P1(,%q2,8)" : \ + : IMM_MODE ((unsigned long int) 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 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)) + +#endif /* __ASSEMBLER__ */ + +#endif /* tls.h */ |