libexec/rtld-elf/x86_64/rtld_machdep.h

   1 /*-
   2  * Copyright (c) 1999, 2000 John D. Polstra.
   3  * All rights reserved.
   4  *
   5  * Redistribution and use in source and binary forms, with or without
   6  * modification, are permitted provided that the following conditions
   7  * are met:
   8  * 1. Redistributions of source code must retain the above copyright
   9  *    notice, this list of conditions and the following disclaimer.
  10  * 2. Redistributions in binary form must reproduce the above copyright
  11  *    notice, this list of conditions and the following disclaimer in the
  12  *    documentation and/or other materials provided with the distribution.
  13  *
  14  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
  15  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  16  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  17  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
  18  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  19  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  20  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  21  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  22  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  23  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  24  * SUCH DAMAGE.
  25  *
  26  * $FreeBSD: src/libexec/rtld-elf/amd64/rtld_machdep.h,v 1.13 2006/03/29 12:29:01 des Exp $
  27  */
  28
  29 #ifndef RTLD_MACHDEP_H
  30 #define RTLD_MACHDEP_H  1
  31
  32 #include <sys/types.h>
  33 #include <machine/atomic.h>
  34
  35 #define CACHE_LINE_SIZE         64
  36
  37 struct Struct_Obj_Entry;
  38
  39 /* Return the address of the .dynamic section in the dynamic linker. */
  40 #define rtld_dynamic(obj) \
  41     ((const Elf_Dyn *)((obj)->relocbase + (Elf_Addr)&_DYNAMIC))
  42
  43 /* Fixup the jump slot at "where" to transfer control to "target". */
  44 static inline Elf_Addr
  45 reloc_jmpslot(Elf_Addr *where, Elf_Addr target)
  46 {
  47 #ifdef dbg
  48     dbg("reloc_jmpslot: *%p = %p", (void *)(where),
  49         (void *)(target));
  50 #endif
  51     (*(Elf_Addr *)(where) = (Elf_Addr)(target));
  52     return target;
  53 }
  54
  55 static inline void
  56 atomic_decr_int(volatile int *p)
  57 {
  58     __asm __volatile ("lock; decl %0" : "+m"(*p) : : "cc");
  59 }
  60
  61 static inline void
  62 atomic_incr_int(volatile int *p)
  63 {
  64     __asm __volatile ("lock; incl %0" : "+m"(*p) : : "cc");
  65 }
  66
  67 #define make_function_pointer(def, defobj) \
  68         ((defobj)->relocbase + (def)->st_value)
  69
  70 #define call_initfini_pointer(obj, target) \
  71         (((InitFunc)(target))())
  72
  73 #define round(size, align) \
  74         (((size) + (align) - 1) & ~((align) - 1))
  75 #define calculate_first_tls_offset(size, align) \
  76         round(size, align)
  77 #define calculate_tls_offset(prev_offset, prev_size, size, align) \
  78         round((prev_offset) + (size), align)
  79 #define calculate_tls_end(off, size)    (off)
  80
  81 typedef struct {
  82     unsigned long ti_module;
  83     unsigned long ti_offset;
  84 } tls_index;
  85
  86 struct tls_tcb;
  87
  88 extern void *__tls_get_addr(tls_index *ti);
  89 extern void *__tls_get_addr_tcb(struct tls_tcb *tcb, tls_index *ti);
  90
  91 #endif