ldso/include/ldso.h

   1 /*
   2  * Copyright (C) 2000-2005 by Erik Andersen <andersen@codepoet.org>
   3  *
   4  * GNU Lesser General Public License version 2.1 or later.
   5  */
   6
   7 #ifndef _LDSO_H
   8 #define _LDSO_H
   9
  10 #include <features.h>
  11
  12 #ifdef __ARCH_USE_MMU__
  13 # define _MAP_UNINITIALIZED 0
  14 #else
  15 # define _MAP_UNINITIALIZED MAP_UNINITIALIZED
  16 #endif
  17
  18 /* Prepare for the case that `__builtin_expect' is not available.  */
  19 #if defined __GNUC__ && __GNUC__ == 2 && __GNUC_MINOR__ < 96
  20 #define __builtin_expect(x, expected_value) (x)
  21 #endif
  22 #ifndef likely
  23 # define likely(x)      __builtin_expect((!!(x)),1)
  24 #endif
  25 #ifndef unlikely
  26 # define unlikely(x)    __builtin_expect((!!(x)),0)
  27 #endif
  28 #ifndef __LINUX_COMPILER_H
  29 #define __LINUX_COMPILER_H
  30 #endif
  31
  32 /* Pull in compiler and arch stuff */
  33 #include <stdlib.h>
  34 #include <stdarg.h>
  35 #include <stddef.h> /* for ptrdiff_t */
  36 #include <stdbool.h>
  37 #define _FCNTL_H
  38 /* We need this if arch has only new syscalls defined */
  39 #ifndef AT_FDCWD
  40 #define AT_FDCWD -100
  41 #endif /* AT_FDCWD */
  42 #include <bits/fcntl.h>
  43 #include <bits/wordsize.h>
  44 /* Pull in the arch specific type information */
  45 #include <sys/types.h>
  46 /* Pull in the arch specific page size */
  47 #include <bits/uClibc_page.h>
  48 /* Pull in the MIN macro */
  49 #include <sys/param.h>
  50 /* Pull in the ldso syscalls and string functions */
  51 #ifndef __ARCH_HAS_NO_SHARED__
  52 #include <dl-syscall.h>
  53 #include <dl-string.h>
  54 /* Now the ldso specific headers */
  55 #include <dl-elf.h>
  56 #ifdef __UCLIBC_HAS_TLS__
  57 /* Defines USE_TLS */
  58 #include <tls.h>
  59 #endif
  60 #include <dl-hash.h>
  61
  62 /* common align masks, if not specified by sysdep headers */
  63 #ifndef ADDR_ALIGN
  64 #define ADDR_ALIGN (_dl_pagesize - 1)
  65 #endif
  66
  67 #ifndef PAGE_ALIGN
  68 #define PAGE_ALIGN (~ADDR_ALIGN)
  69 #endif
  70
  71 #ifndef OFFS_ALIGN
  72 #define OFFS_ALIGN (PAGE_ALIGN & ~(1ul << (sizeof(_dl_pagesize) * 8 - 1)))
  73 #endif
  74
  75 /* For INIT/FINI dependency sorting. */
  76 struct init_fini_list {
  77         struct init_fini_list *next;
  78         struct elf_resolve *tpnt;
  79 };
  80
  81 /* Global variables used within the shared library loader */
  82 extern char *_dl_library_path;         /* Where we look for libraries */
  83 extern char *_dl_preload;              /* Things to be loaded before the libs */
  84 #ifdef __LDSO_SEARCH_INTERP_PATH__
  85 extern const char *_dl_ldsopath;       /* Where the shared lib loader was found */
  86 #endif
  87 extern const char *_dl_progname;       /* The name of the executable being run */
  88 extern size_t _dl_pagesize;            /* Store the page size for use later */
  89 #ifdef __LDSO_PRELINK_SUPPORT__
  90 extern char *_dl_trace_prelink;        /* Library for prelinking trace */
  91 extern struct elf_resolve *_dl_trace_prelink_map;       /* Library map for prelinking trace */
  92 #else
  93 #define _dl_trace_prelink               0
  94 #endif
  95 #ifdef __DSBT__
  96 extern void **_dl_ldso_dsbt;
  97 #endif
  98
  99 #if defined(USE_TLS) && USE_TLS
 100 extern void _dl_add_to_slotinfo (struct link_map  *l);
 101 extern void ** __attribute__ ((const)) _dl_initial_error_catch_tsd (void);
 102 #endif
 103
 104 #ifdef __SUPPORT_LD_DEBUG__
 105 extern char *_dl_debug;
 106 extern char *_dl_debug_symbols;
 107 extern char *_dl_debug_move;
 108 extern char *_dl_debug_reloc;
 109 extern char *_dl_debug_detail;
 110 extern char *_dl_debug_nofixups;
 111 extern char *_dl_debug_bindings;
 112 extern int   _dl_debug_file;
 113 # define __dl_debug_dprint(fmt, args...) \
 114         _dl_dprintf(_dl_debug_file, "%s:%i: " fmt, __func__, __LINE__, ## args);
 115 # define _dl_if_debug_dprint(fmt, args...) \
 116         do { if (_dl_debug) __dl_debug_dprint(fmt, ## args); } while (0)
 117 #else
 118 # define __dl_debug_dprint(fmt, args...) do {} while (0)
 119 # define _dl_if_debug_dprint(fmt, args...) do {} while (0)
 120 /* disabled on purpose, _dl_debug_file should be guarded by __SUPPORT_LD_DEBUG__
 121 # define _dl_debug_file 2*/
 122 #endif /* __SUPPORT_LD_DEBUG__ */
 123
 124 #ifdef IS_IN_rtld
 125 # ifdef __SUPPORT_LD_DEBUG__
 126 #  define _dl_assert(expr)                                              \
 127         do {                                                            \
 128                 if (!(expr)) {                                          \
 129                         __dl_debug_dprint("assert(%s)\n", #expr);       \
 130                         _dl_exit(45);                                   \
 131                 }                                                       \
 132         } while (0)
 133 # else
 134 #  define _dl_assert(expr) ((void)0)
 135 # endif
 136 #else
 137 # include <assert.h>
 138 # define _dl_assert(expr) assert(expr)
 139 #endif
 140
 141 #ifdef __SUPPORT_LD_DEBUG_EARLY__
 142 # define _dl_debug_early(fmt, args...) __dl_debug_dprint(fmt, ## args)
 143 #else
 144 # define _dl_debug_early(fmt, args...) do {} while (0)
 145 #endif /* __SUPPORT_LD_DEBUG_EARLY__ */
 146
 147 #ifndef NULL
 148 #define NULL ((void *) 0)
 149 #endif
 150
 151 extern void *_dl_malloc(size_t size);
 152 extern void *_dl_calloc(size_t __nmemb, size_t __size);
 153 extern void *_dl_realloc(void *__ptr, size_t __size);
 154 extern void _dl_free(void *);
 155 extern char *_dl_getenv(const char *symbol, char **envp);
 156 extern void _dl_unsetenv(const char *symbol, char **envp);
 157 #ifdef IS_IN_rtld
 158 extern char *_dl_strdup(const char *string);
 159 extern void _dl_dprintf(int, const char *, ...);
 160 #else
 161 # include <string.h>
 162 # define _dl_strdup strdup
 163 # include <stdio.h>
 164 # ifdef __USE_GNU
 165 #  define _dl_dprintf dprintf
 166 # else
 167 #  define _dl_dprintf(fd, fmt, args...) fprintf(stderr, fmt, ## args)
 168 # endif
 169 #endif
 170
 171 #ifndef DL_GET_READY_TO_RUN_EXTRA_PARMS
 172 # define DL_GET_READY_TO_RUN_EXTRA_PARMS
 173 #endif
 174 #ifndef DL_GET_READY_TO_RUN_EXTRA_ARGS
 175 # define DL_GET_READY_TO_RUN_EXTRA_ARGS
 176 #endif
 177
 178 extern void *_dl_get_ready_to_run(struct elf_resolve *tpnt, DL_LOADADDR_TYPE load_addr,
 179                 ElfW(auxv_t) auxvt[AT_EGID + 1], char **envp, char **argv
 180                 DL_GET_READY_TO_RUN_EXTRA_PARMS);
 181
 182 #ifdef HAVE_DL_INLINES_H
 183 #include <dl-inlines.h>
 184 #endif
 185
 186 #else /* __ARCH_HAS_NO_SHARED__ */
 187 #include <dl-defs.h>
 188 #endif
 189
 190 #endif /* _LDSO_H */