libexec/rtld-elf/i386/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/i386/rtld_machdep.h,v 1.3.2.2 2002/07/02 04:10:51 jdp Exp $
  27  * $DragonFly: src/libexec/rtld-elf/i386/rtld_machdep.h,v 1.7 2005/05/11 19:47:09 dillon Exp $
  28  */
  29
  30 #ifndef RTLD_MACHDEP_H
  31 #define RTLD_MACHDEP_H  1
  32
  33 /* Return the address of the .dynamic section in the dynamic linker. */
  34 #define rtld_dynamic(obj) \
  35     ((const Elf_Dyn *)((obj)->relocbase + (Elf_Addr)&_DYNAMIC))
  36
  37 /* Fixup the jump slot at "where" to transfer control to "target". */
  38 #define reloc_jmpslot(where, target)                    \
  39     do {                                                \
  40         dbg("reloc_jmpslot: *%p = %p", (void *)(where), \
  41           (void *)(target));                            \
  42         (*(Elf_Addr *)(where) = (Elf_Addr)(target));    \
  43     } while (0)
  44
  45 static inline void
  46 atomic_decr_int(volatile int *p)
  47 {
  48     __asm __volatile ("lock; decl %0" : "+m"(*p) : : "cc");
  49 }
  50
  51 static inline void
  52 atomic_incr_int(volatile int *p)
  53 {
  54     __asm __volatile ("lock; incl %0" : "+m"(*p) : : "cc");
  55 }
  56
  57 static inline void
  58 atomic_add_int(volatile int *p, int val)
  59 {
  60     __asm __volatile ("lock; addl %1, %0"
  61         : "+m"(*p)
  62         : "ri"(val)
  63         : "cc");
  64 }
  65
  66 #define round(size, align) \
  67         (((size) + (align) - 1) & ~((align) - 1))
  68 #define calculate_first_tls_offset(size, align) \
  69         round(size, align)
  70 #define calculate_tls_offset(prev_offset, prev_size, size, align) \
  71         round((prev_offset) + (size), align)
  72 #define calculate_tls_end(off, size)    (off)
  73
  74 typedef struct {
  75     unsigned long ti_module;
  76     unsigned long ti_offset;
  77 } tls_index;
  78
  79 struct tls_tcb;
  80
  81 extern void *___tls_get_addr(tls_index *ti) __attribute__((__regparm__(1)));
  82 extern void *__tls_get_addr(tls_index *ti);
  83 extern void *__tls_get_addr_tcb(struct tls_tcb *tcb, tls_index *ti);
  84
  85 #endif