ldso/include/ldso.h

   1 /* vi: set sw=4 ts=4: */
   2 /*
   3  * Copyright (C) 2000-2005 by Erik Andersen <andersen@codepoet.org>
   4  *
   5  * GNU Lesser General Public License version 2.1 or later.
   6  */
   7
   8 #ifndef _LDSO_H_
   9 #define _LDSO_H_
  10
  11 #include <features.h>
  12
  13 /* Prepare for the case that `__builtin_expect' is not available.  */
  14 #if defined __GNUC__ && __GNUC__ == 2 && __GNUC_MINOR__ < 96
  15 #define __builtin_expect(x, expected_value) (x)
  16 #endif
  17 #ifndef likely
  18 # define likely(x)      __builtin_expect((!!(x)),1)
  19 #endif
  20 #ifndef unlikely
  21 # define unlikely(x)    __builtin_expect((!!(x)),0)
  22 #endif
  23 #ifndef __LINUX_COMPILER_H
  24 #define __LINUX_COMPILER_H
  25 #endif
  26
  27 /* Pull in compiler and arch stuff */
  28 #include <stdlib.h>
  29 #include <stdarg.h>
  30 #define _FCNTL_H
  31 #include <bits/fcntl.h>
  32 #include <bits/wordsize.h>
  33 /* Pull in the arch specific type information */
  34 #include <sys/types.h>
  35 /* Pull in the arch specific page size */
  36 #include <bits/uClibc_page.h>
  37 /* Pull in the ldso syscalls and string functions */
  38 #ifndef __ARCH_HAS_NO_SHARED__
  39 #include <dl-syscall.h>
  40 #include <dl-string.h>
  41 #include <dlfcn.h>
  42 /* Now the ldso specific headers */
  43 #include <dl-elf.h>
  44 #ifdef __UCLIBC_HAS_TLS__
  45 /* Defines USE_TLS */
  46 #include <tls.h>
  47 #endif
  48 #include <dl-hash.h>
  49
  50 /* common align masks, if not specified by sysdep headers */
  51 #ifndef ADDR_ALIGN
  52 #define ADDR_ALIGN (_dl_pagesize - 1)
  53 #endif
  54
  55 #ifndef PAGE_ALIGN
  56 #define PAGE_ALIGN (~ADDR_ALIGN)
  57 #endif
  58
  59 #ifndef OFFS_ALIGN
  60 #define OFFS_ALIGN (PAGE_ALIGN & ~(1ul << (sizeof(_dl_pagesize) * 8 - 1)))
  61 #endif
  62
  63 /* For INIT/FINI dependency sorting. */
  64 struct init_fini_list {
  65         struct init_fini_list *next;
  66         struct elf_resolve *tpnt;
  67 };
  68
  69 /* Global variables used within the shared library loader */
  70 extern char *_dl_library_path;         /* Where we look for libraries */
  71 extern char *_dl_preload;              /* Things to be loaded before the libs */
  72 extern char *_dl_ldsopath;             /* Where the shared lib loader was found */
  73 extern const char *_dl_progname;       /* The name of the executable being run */
  74 extern size_t _dl_pagesize;            /* Store the page size for use later */
  75
  76 #if defined(USE_TLS) && USE_TLS
  77 extern void _dl_add_to_slotinfo (struct link_map  *l);
  78 extern void ** __attribute__ ((const)) _dl_initial_error_catch_tsd (void);
  79 #endif
  80
  81 #ifdef USE_TLS
  82 void _dl_add_to_slotinfo (struct link_map  *l);
  83 void ** __attribute__ ((const)) _dl_initial_error_catch_tsd (void);
  84 #endif
  85 #ifdef __SUPPORT_LD_DEBUG__
  86 extern char *_dl_debug;
  87 extern char *_dl_debug_symbols;
  88 extern char *_dl_debug_move;
  89 extern char *_dl_debug_reloc;
  90 extern char *_dl_debug_detail;
  91 extern char *_dl_debug_nofixups;
  92 extern char *_dl_debug_bindings;
  93 extern int   _dl_debug_file;
  94 # define __dl_debug_dprint(fmt, args...) \
  95         _dl_dprintf(_dl_debug_file, "%s:%i: " fmt, __FUNCTION__, __LINE__, ## args);
  96 # define _dl_if_debug_dprint(fmt, args...) \
  97         do { if (_dl_debug) __dl_debug_dprint(fmt, ## args); } while (0)
  98 #else
  99 # define __dl_debug_dprint(fmt, args...) do {} while (0)
 100 # define _dl_if_debug_dprint(fmt, args...) do {} while (0)
 101 # define _dl_debug_file 2
 102 #endif /* __SUPPORT_LD_DEBUG__ */
 103
 104 #ifdef IS_IN_rtld
 105 # ifdef __SUPPORT_LD_DEBUG__
 106 #  define _dl_assert(expr)                                              \
 107         do {                                                            \
 108                 if (!(expr)) {                                          \
 109                         __dl_debug_dprint("assert(%s)\n", #expr);       \
 110                         _dl_exit(45);                                   \
 111                 }                                                       \
 112         } while (0)
 113 # else
 114 #  define _dl_assert(expr) ((void)0)
 115 # endif
 116 #else
 117 # include <assert.h>
 118 # define _dl_assert(expr) assert(expr)
 119 #endif
 120
 121 #ifdef __SUPPORT_LD_DEBUG_EARLY__
 122 # define _dl_debug_early(fmt, args...) __dl_debug_dprint(fmt, ## args)
 123 #else
 124 # define _dl_debug_early(fmt, args...) do {} while (0)
 125 #endif /* __SUPPORT_LD_DEBUG_EARLY__ */
 126
 127 #ifndef NULL
 128 #define NULL ((void *) 0)
 129 #endif
 130
 131 extern void *_dl_malloc(size_t size);
 132 extern void *_dl_calloc(size_t __nmemb, size_t __size);
 133 extern void *_dl_realloc(void *__ptr, size_t __size);
 134 extern void _dl_free(void *);
 135 extern char *_dl_getenv(const char *symbol, char **envp);
 136 extern void _dl_unsetenv(const char *symbol, char **envp);
 137 extern char *_dl_strdup(const char *string);
 138 extern void _dl_dprintf(int, const char *, ...);
 139
 140 #ifndef DL_GET_READY_TO_RUN_EXTRA_PARMS
 141 # define DL_GET_READY_TO_RUN_EXTRA_PARMS
 142 #endif
 143 #ifndef DL_GET_READY_TO_RUN_EXTRA_ARGS
 144 # define DL_GET_READY_TO_RUN_EXTRA_ARGS
 145 #endif
 146
 147 extern void _dl_get_ready_to_run(struct elf_resolve *tpnt, DL_LOADADDR_TYPE load_addr,
 148                 ElfW(auxv_t) auxvt[AT_EGID + 1], char **envp, char **argv
 149                 DL_GET_READY_TO_RUN_EXTRA_PARMS);
 150
 151 #ifdef HAVE_DL_INLINES_H
 152 #include <dl-inlines.h>
 153 #endif
 154
 155 #else /* __ARCH_HAS_NO_SHARED__ */
 156 #include <dl-defs.h>
 157 #endif
 158
 159 #endif /* _LDSO_H_ */