libc-top-half/musl/src/internal/dynlink.h

   1 #ifndef _INTERNAL_RELOC_H
   2 #define _INTERNAL_RELOC_H
   3
   4 #include <features.h>
   5 #include <elf.h>
   6 #include <stdint.h>
   7 #include <stddef.h>
   8 #include <stdarg.h>
   9
  10 #if UINTPTR_MAX == 0xffffffff
  11 typedef Elf32_Ehdr Ehdr;
  12 typedef Elf32_Phdr Phdr;
  13 typedef Elf32_Sym Sym;
  14 #define R_TYPE(x) ((x)&255)
  15 #define R_SYM(x) ((x)>>8)
  16 #define R_INFO ELF32_R_INFO
  17 #else
  18 typedef Elf64_Ehdr Ehdr;
  19 typedef Elf64_Phdr Phdr;
  20 typedef Elf64_Sym Sym;
  21 #define R_TYPE(x) ((x)&0x7fffffff)
  22 #define R_SYM(x) ((x)>>32)
  23 #define R_INFO ELF64_R_INFO
  24 #endif
  25
  26 /* These enum constants provide unmatchable default values for
  27  * any relocation type the arch does not use. */
  28 enum {
  29         REL_NONE = 0,
  30         REL_SYMBOLIC = -100,
  31         REL_GOT,
  32         REL_PLT,
  33         REL_RELATIVE,
  34         REL_OFFSET,
  35         REL_OFFSET32,
  36         REL_COPY,
  37         REL_SYM_OR_REL,
  38         REL_DTPMOD,
  39         REL_DTPOFF,
  40         REL_TPOFF,
  41         REL_TPOFF_NEG,
  42         REL_TLSDESC,
  43         REL_FUNCDESC,
  44         REL_FUNCDESC_VAL,
  45 };
  46
  47 struct fdpic_loadseg {
  48         uintptr_t addr, p_vaddr, p_memsz;
  49 };
  50
  51 struct fdpic_loadmap {
  52         unsigned short version, nsegs;
  53         struct fdpic_loadseg segs[];
  54 };
  55
  56 struct fdpic_dummy_loadmap {
  57         unsigned short version, nsegs;
  58         struct fdpic_loadseg segs[1];
  59 };
  60
  61 #include "reloc.h"
  62
  63 #ifndef FDPIC_CONSTDISP_FLAG
  64 #define FDPIC_CONSTDISP_FLAG 0
  65 #endif
  66
  67 #ifndef DL_FDPIC
  68 #define DL_FDPIC 0
  69 #endif
  70
  71 #ifndef DL_NOMMU_SUPPORT
  72 #define DL_NOMMU_SUPPORT 0
  73 #endif
  74
  75 #if !DL_FDPIC
  76 #define IS_RELATIVE(x,s) ( \
  77         (R_TYPE(x) == REL_RELATIVE) || \
  78         (R_TYPE(x) == REL_SYM_OR_REL && !R_SYM(x)) )
  79 #else
  80 #define IS_RELATIVE(x,s) ( ( \
  81         (R_TYPE(x) == REL_FUNCDESC_VAL) || \
  82         (R_TYPE(x) == REL_SYMBOLIC) ) \
  83         && (((s)[R_SYM(x)].st_info & 0xf) == STT_SECTION) )
  84 #endif
  85
  86 #ifndef NEED_MIPS_GOT_RELOCS
  87 #define NEED_MIPS_GOT_RELOCS 0
  88 #endif
  89
  90 #ifndef DT_DEBUG_INDIRECT
  91 #define DT_DEBUG_INDIRECT 0
  92 #endif
  93
  94 #define AUX_CNT 32
  95 #define DYN_CNT 32
  96
  97 typedef void (*stage2_func)(unsigned char *, size_t *);
  98 typedef void (*stage3_func)(size_t *);
  99
 100 hidden void *__dlsym(void *restrict, const char *restrict, void *restrict);
 101
 102 hidden void __dl_seterr(const char *, ...);
 103 hidden int __dl_invalid_handle(void *);
 104 hidden void __dl_vseterr(const char *, va_list);
 105
 106 hidden ptrdiff_t __tlsdesc_static(), __tlsdesc_dynamic();
 107
 108 #endif