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* elf/rtld.c: Define __pointer_chk_guard_local and if necessary __pointer_chk_guard. (_rtld_global_ro): Initialize _dl_pointer_guard. (dl_main): Initialize __pointer_chk_guard_local and either __pointer_chk_guard or TLS value if necessary. (process_envvars): Recognize and handle LD_POINTER_GUARD. * sysdeps/generic/ldsodefs.h (rtld_global_ro): Add _dl_pointer_guard. * sysdeps/i386/__longjmp.S: Use PTR_DEMANGLE for PC if defined. * sysdeps/x86_64/__longjmp.S: Likewise. * sysdeps/i386/bsd-_setjmp.S: Use PTR_MANGLE for PC if defined. * sysdeps/i386/bsd-_setjmp.S: Likewise. * sysdeps/i386/setjmp.S: Likewise. [IS_IN_rtld]: Avoid call to __sigjmp_save. * sysdeps/i386/setjmp.S: Likewise. * sysdeps/unix/sysv/linux/i386/sysdep.h: Define PTR_MANGLE and PTR_DEMANGLE. * sysdeps/unix/sysv/linux/x86_64/sysdep.h: Likewise. * sysdeps/i386/elf/setjmp.S: Removed. * sysdeps/i386/elf/bsd-setjmp.S: Removed.
440 lines
15 KiB
C
440 lines
15 KiB
C
/* Definition for thread-local data handling. nptl/i386 version.
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Copyright (C) 2002, 2003, 2004, 2005 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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The GNU C Library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Lesser General Public
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License as published by the Free Software Foundation; either
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version 2.1 of the License, or (at your option) any later version.
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The GNU C Library is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public
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License along with the GNU C Library; if not, write to the Free
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Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
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02111-1307 USA. */
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#ifndef _TLS_H
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#define _TLS_H 1
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#include <dl-sysdep.h>
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#ifndef __ASSEMBLER__
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# include <stdbool.h>
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# include <stddef.h>
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# include <stdint.h>
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# include <stdlib.h>
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# include <list.h>
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/* Type for the dtv. */
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typedef union dtv
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{
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size_t counter;
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struct
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{
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void *val;
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bool is_static;
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} pointer;
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} dtv_t;
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typedef struct
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{
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void *tcb; /* Pointer to the TCB. Not necessarily the
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thread descriptor used by libpthread. */
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dtv_t *dtv;
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void *self; /* Pointer to the thread descriptor. */
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int multiple_threads;
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uintptr_t sysinfo;
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uintptr_t stack_guard;
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uintptr_t pointer_guard;
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} tcbhead_t;
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# define TLS_MULTIPLE_THREADS_IN_TCB 1
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#else /* __ASSEMBLER__ */
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# include <tcb-offsets.h>
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#endif
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/* We require TLS support in the tools. */
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#ifndef HAVE_TLS_SUPPORT
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# error "TLS support is required."
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#endif
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/* Signal that TLS support is available. */
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#define USE_TLS 1
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/* Alignment requirement for the stack. For IA-32 this is governed by
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the SSE memory functions. */
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#define STACK_ALIGN 16
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#ifndef __ASSEMBLER__
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/* Get system call information. */
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# include <sysdep.h>
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/* The old way: using LDT. */
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/* Structure passed to `modify_ldt', 'set_thread_area', and 'clone' calls. */
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struct user_desc
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{
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unsigned int entry_number;
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unsigned long int base_addr;
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unsigned int limit;
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unsigned int seg_32bit:1;
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unsigned int contents:2;
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unsigned int read_exec_only:1;
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unsigned int limit_in_pages:1;
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unsigned int seg_not_present:1;
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unsigned int useable:1;
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unsigned int empty:25;
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};
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/* Initializing bit fields is slow. We speed it up by using a union. */
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union user_desc_init
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{
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struct user_desc desc;
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unsigned int vals[4];
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};
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/* Get the thread descriptor definition. */
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# include <nptl/descr.h>
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/* This is the size of the initial TCB. Can't be just sizeof (tcbhead_t),
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because NPTL getpid, __libc_alloca_cutoff etc. need (almost) the whole
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struct pthread even when not linked with -lpthread. */
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# define TLS_INIT_TCB_SIZE sizeof (struct pthread)
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/* Alignment requirements for the initial TCB. */
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# define TLS_INIT_TCB_ALIGN __alignof__ (struct pthread)
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/* This is the size of the TCB. */
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# define TLS_TCB_SIZE sizeof (struct pthread)
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/* Alignment requirements for the TCB. */
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# define TLS_TCB_ALIGN __alignof__ (struct pthread)
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/* The TCB can have any size and the memory following the address the
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thread pointer points to is unspecified. Allocate the TCB there. */
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# define TLS_TCB_AT_TP 1
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/* Install the dtv pointer. The pointer passed is to the element with
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index -1 which contain the length. */
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# define INSTALL_DTV(descr, dtvp) \
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((tcbhead_t *) (descr))->dtv = (dtvp) + 1
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/* Install new dtv for current thread. */
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# define INSTALL_NEW_DTV(dtvp) \
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({ struct pthread *__pd; \
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THREAD_SETMEM (__pd, header.dtv, (dtvp)); })
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/* Return dtv of given thread descriptor. */
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# define GET_DTV(descr) \
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(((tcbhead_t *) (descr))->dtv)
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#define THREAD_SELF_SYSINFO THREAD_GETMEM (THREAD_SELF, header.sysinfo)
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#define THREAD_SYSINFO(pd) ((pd)->header.sysinfo)
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/* Macros to load from and store into segment registers. */
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# ifndef TLS_GET_GS
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# define TLS_GET_GS() \
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({ int __seg; __asm ("movw %%gs, %w0" : "=q" (__seg)); __seg & 0xffff; })
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# endif
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# ifndef TLS_SET_GS
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# define TLS_SET_GS(val) \
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__asm ("movw %w0, %%gs" :: "q" (val))
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# endif
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# ifndef __NR_set_thread_area
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# define __NR_set_thread_area 243
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# endif
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# ifndef TLS_FLAG_WRITABLE
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# define TLS_FLAG_WRITABLE 0x00000001
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# endif
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// XXX Enable for the real world.
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#if 0
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# ifndef __ASSUME_SET_THREAD_AREA
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# error "we need set_thread_area"
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# endif
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#endif
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# ifdef __PIC__
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# define TLS_EBX_ARG "r"
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# define TLS_LOAD_EBX "xchgl %3, %%ebx\n\t"
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# else
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# define TLS_EBX_ARG "b"
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# define TLS_LOAD_EBX
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# endif
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#if defined NEED_DL_SYSINFO
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# define INIT_SYSINFO \
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_head->sysinfo = GLRO(dl_sysinfo)
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#else
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# define INIT_SYSINFO
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#endif
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#ifndef LOCK_PREFIX
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# ifdef UP
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# define LOCK_PREFIX /* nothing */
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# else
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# define LOCK_PREFIX "lock;"
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# endif
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#endif
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/* Code to initially initialize the thread pointer. This might need
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special attention since 'errno' is not yet available and if the
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operation can cause a failure 'errno' must not be touched. */
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# define TLS_INIT_TP(thrdescr, secondcall) \
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({ void *_thrdescr = (thrdescr); \
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tcbhead_t *_head = _thrdescr; \
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union user_desc_init _segdescr; \
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int _result; \
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\
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_head->tcb = _thrdescr; \
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/* For now the thread descriptor is at the same address. */ \
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_head->self = _thrdescr; \
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/* New syscall handling support. */ \
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INIT_SYSINFO; \
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\
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/* The 'entry_number' field. Let the kernel pick a value. */ \
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if (secondcall) \
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_segdescr.vals[0] = TLS_GET_GS () >> 3; \
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else \
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_segdescr.vals[0] = -1; \
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/* The 'base_addr' field. Pointer to the TCB. */ \
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_segdescr.vals[1] = (unsigned long int) _thrdescr; \
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/* The 'limit' field. We use 4GB which is 0xfffff pages. */ \
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_segdescr.vals[2] = 0xfffff; \
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/* Collapsed value of the bitfield: \
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.seg_32bit = 1 \
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.contents = 0 \
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.read_exec_only = 0 \
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.limit_in_pages = 1 \
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.seg_not_present = 0 \
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.useable = 1 */ \
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_segdescr.vals[3] = 0x51; \
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\
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/* Install the TLS. */ \
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asm volatile (TLS_LOAD_EBX \
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"int $0x80\n\t" \
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TLS_LOAD_EBX \
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: "=a" (_result), "=m" (_segdescr.desc.entry_number) \
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: "0" (__NR_set_thread_area), \
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TLS_EBX_ARG (&_segdescr.desc), "m" (_segdescr.desc)); \
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\
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if (_result == 0) \
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/* We know the index in the GDT, now load the segment register. \
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The use of the GDT is described by the value 3 in the lower \
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three bits of the segment descriptor value. \
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\
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Note that we have to do this even if the numeric value of \
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the descriptor does not change. Loading the segment register \
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causes the segment information from the GDT to be loaded \
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which is necessary since we have changed it. */ \
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TLS_SET_GS (_segdescr.desc.entry_number * 8 + 3); \
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\
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_result == 0 ? NULL \
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: "set_thread_area failed when setting up thread-local storage\n"; })
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/* Return the address of the dtv for the current thread. */
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# define THREAD_DTV() \
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({ struct pthread *__pd; \
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THREAD_GETMEM (__pd, header.dtv); })
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/* Return the thread descriptor for the current thread.
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The contained asm must *not* be marked volatile since otherwise
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assignments like
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pthread_descr self = thread_self();
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do not get optimized away. */
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# define THREAD_SELF \
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({ struct pthread *__self; \
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asm ("movl %%gs:%c1,%0" : "=r" (__self) \
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: "i" (offsetof (struct pthread, header.self))); \
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__self;})
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/* Magic for libthread_db to know how to do THREAD_SELF. */
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# define DB_THREAD_SELF \
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REGISTER_THREAD_AREA (32, offsetof (struct user_regs_struct, xgs), 3) \
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REGISTER_THREAD_AREA (64, 26 * 8, 3) /* x86-64's user_regs_struct->gs */
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/* Read member of the thread descriptor directly. */
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# define THREAD_GETMEM(descr, member) \
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({ __typeof (descr->member) __value; \
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if (sizeof (__value) == 1) \
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asm volatile ("movb %%gs:%P2,%b0" \
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: "=q" (__value) \
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: "0" (0), "i" (offsetof (struct pthread, member))); \
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else if (sizeof (__value) == 4) \
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asm volatile ("movl %%gs:%P1,%0" \
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: "=r" (__value) \
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: "i" (offsetof (struct pthread, member))); \
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else \
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{ \
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if (sizeof (__value) != 8) \
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/* There should not be any value with a size other than 1, \
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4 or 8. */ \
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abort (); \
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\
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asm volatile ("movl %%gs:%P1,%%eax\n\t" \
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"movl %%gs:%P2,%%edx" \
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: "=A" (__value) \
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: "i" (offsetof (struct pthread, member)), \
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"i" (offsetof (struct pthread, member) + 4)); \
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} \
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__value; })
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/* Same as THREAD_GETMEM, but the member offset can be non-constant. */
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# define THREAD_GETMEM_NC(descr, member, idx) \
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({ __typeof (descr->member[0]) __value; \
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if (sizeof (__value) == 1) \
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asm volatile ("movb %%gs:%P2(%3),%b0" \
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: "=q" (__value) \
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: "0" (0), "i" (offsetof (struct pthread, member[0])), \
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"r" (idx)); \
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else if (sizeof (__value) == 4) \
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asm volatile ("movl %%gs:%P1(,%2,4),%0" \
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: "=r" (__value) \
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: "i" (offsetof (struct pthread, member[0])), \
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"r" (idx)); \
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else \
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{ \
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if (sizeof (__value) != 8) \
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/* There should not be any value with a size other than 1, \
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4 or 8. */ \
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abort (); \
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\
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asm volatile ("movl %%gs:%P1(,%2,8),%%eax\n\t" \
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"movl %%gs:4+%P1(,%2,8),%%edx" \
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: "=&A" (__value) \
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: "i" (offsetof (struct pthread, member[0])), \
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"r" (idx)); \
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} \
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__value; })
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/* Same as THREAD_SETMEM, but the member offset can be non-constant. */
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# define THREAD_SETMEM(descr, member, value) \
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({ if (sizeof (descr->member) == 1) \
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asm volatile ("movb %b0,%%gs:%P1" : \
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: "iq" (value), \
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"i" (offsetof (struct pthread, member))); \
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else if (sizeof (descr->member) == 4) \
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asm volatile ("movl %0,%%gs:%P1" : \
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: "ir" (value), \
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"i" (offsetof (struct pthread, member))); \
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else \
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{ \
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if (sizeof (descr->member) != 8) \
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/* There should not be any value with a size other than 1, \
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4 or 8. */ \
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abort (); \
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\
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asm volatile ("movl %%eax,%%gs:%P1\n\t" \
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"movl %%edx,%%gs:%P2" : \
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: "A" (value), \
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"i" (offsetof (struct pthread, member)), \
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"i" (offsetof (struct pthread, member) + 4)); \
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}})
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/* Set member of the thread descriptor directly. */
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# define THREAD_SETMEM_NC(descr, member, idx, value) \
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({ if (sizeof (descr->member[0]) == 1) \
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asm volatile ("movb %b0,%%gs:%P1(%2)" : \
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: "iq" (value), \
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"i" (offsetof (struct pthread, member)), \
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"r" (idx)); \
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else if (sizeof (descr->member[0]) == 4) \
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asm volatile ("movl %0,%%gs:%P1(,%2,4)" : \
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: "ir" (value), \
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"i" (offsetof (struct pthread, member)), \
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"r" (idx)); \
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else \
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{ \
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if (sizeof (descr->member[0]) != 8) \
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/* There should not be any value with a size other than 1, \
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4 or 8. */ \
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abort (); \
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\
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asm volatile ("movl %%eax,%%gs:%P1(,%2,8)\n\t" \
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"movl %%edx,%%gs:4+%P1(,%2,8)" : \
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: "A" (value), \
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"i" (offsetof (struct pthread, member)), \
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"r" (idx)); \
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}})
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/* Atomic compare and exchange on TLS, returning old value. */
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#define THREAD_ATOMIC_CMPXCHG_VAL(descr, member, newval, oldval) \
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({ __typeof (descr->member) __ret; \
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__typeof (oldval) __old = (oldval); \
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if (sizeof (descr->member) == 4) \
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asm volatile (LOCK_PREFIX "cmpxchgl %2, %%gs:%P3" \
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: "=a" (__ret) \
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: "0" (__old), "r" (newval), \
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"i" (offsetof (struct pthread, member))); \
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else \
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/* Not necessary for other sizes in the moment. */ \
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abort (); \
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__ret; })
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/* Atomic set bit. */
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#define THREAD_ATOMIC_BIT_SET(descr, member, bit) \
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(void) ({ if (sizeof ((descr)->member) == 4) \
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asm volatile (LOCK_PREFIX "orl %1, %%gs:%P0" \
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:: "i" (offsetof (struct pthread, member)), \
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"ir" (1 << (bit))); \
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else \
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/* Not necessary for other sizes in the moment. */ \
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abort (); })
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/* Call the user-provided thread function. */
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#define CALL_THREAD_FCT(descr) \
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({ void *__res; \
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int __ignore1, __ignore2; \
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asm volatile ("pushl %%eax\n\t" \
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"pushl %%eax\n\t" \
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"pushl %%eax\n\t" \
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"pushl %%gs:%P4\n\t" \
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"call *%%gs:%P3\n\t" \
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"addl $16, %%esp" \
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: "=a" (__res), "=c" (__ignore1), "=d" (__ignore2) \
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: "i" (offsetof (struct pthread, start_routine)), \
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"i" (offsetof (struct pthread, arg))); \
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__res; })
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/* Set the stack guard field in TCB head. */
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#define THREAD_SET_STACK_GUARD(value) \
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THREAD_SETMEM (THREAD_SELF, header.stack_guard, value)
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#define THREAD_COPY_STACK_GUARD(descr) \
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((descr)->header.stack_guard \
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= THREAD_GETMEM (THREAD_SELF, header.stack_guard))
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/* Set the pointer guard field in the TCB head. */
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#define THREAD_SET_POINTER_GUARD(value) \
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THREAD_SETMEM (THREAD_SELF, header.pointer_guard, value)
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#define THREAD_COPY_POINTER_GUARD(descr) \
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((descr)->header.pointer_guard \
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= THREAD_GETMEM (THREAD_SELF, header.pointer_guard))
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#endif /* __ASSEMBLER__ */
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#endif /* tls.h */
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