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