prx.h

   1 /**
   2  * Author: Humberto Naves (hsnaves@gmail.com)
   3  */
   4
   5 #ifndef __PRX_H
   6 #define __PRX_H
   7
   8 #include "types.h"
   9 #include "nids.h"
  10
  11 #define ELF_HEADER_IDENT        16
  12 #define ELF_PRX_TYPE            0xFFA0
  13 #define ELF_MACHINE_MIPS        8
  14 #define ELF_VERSION_CURRENT     1
  15 #define ELF_FLAGS_MACH_ALLEGREX 0x00A20000
  16 #define ELF_FLAGS_ABI_EABI32    0x00003000
  17 #define ELF_FLAGS_MIPS_ARCH2    0x10000000
  18
  19
  20 /* Structure to hold prx header data */
  21 struct prx
  22 {
  23   uint8  ident[ELF_HEADER_IDENT];
  24   uint16 type;
  25   uint16 machine;
  26   uint32 version;
  27   uint32 entry;
  28   uint32 phoff;
  29   uint32 shoff;
  30   uint32 flags;
  31   uint16 ehsize;
  32   uint16 phentsize;
  33   uint16 phnum;
  34   uint16 shentsize;
  35   uint16 shnum;
  36   uint16 shstrndx;
  37
  38   uint32 size;
  39   const uint8 *data;
  40
  41   struct elf_section *sections;
  42
  43   struct elf_program *programs;
  44
  45   uint32 relocnum;
  46   struct prx_reloc *relocs;
  47   struct prx_reloc *relocsbyaddr;
  48
  49   struct prx_modinfo *modinfo;
  50 };
  51
  52 #define SHT_NULL            0
  53 #define SHT_PROGBITS        1
  54 #define SHT_STRTAB          3
  55 #define SHT_NOBITS          8
  56 #define SHT_LOPROC 0x70000000
  57 #define SHT_HIPROC 0x7fffffff
  58 #define SHT_LOUSER 0x80000000
  59 #define SHT_HIUSER 0xffffffff
  60
  61 #define SHT_PRXRELOC (SHT_LOPROC | 0xA0)
  62
  63 #define SHF_WRITE               1
  64 #define SHF_ALLOC               2
  65 #define SHF_EXECINSTR           4
  66
  67 /* Structure defining a single elf section */
  68 struct elf_section
  69 {
  70   uint32 idxname;
  71   uint32 type;
  72   uint32 flags;
  73   uint32 addr;
  74   uint32 offset;
  75   uint32 size;
  76   uint32 link;
  77   uint32 info;
  78   uint32 addralign;
  79   uint32 entsize;
  80
  81   const uint8 *data;
  82   const char *name;
  83
  84 };
  85
  86 #define PT_NULL                 0
  87 #define PT_LOAD                 1
  88 #define PT_LOPROC               0x70000000
  89 #define PT_HIPROC               0x7fffffff
  90 #define PT_PRXRELOC             (PT_LOPROC | 0xA0)
  91 #define PT_PRXRELOC2            (PT_LOPROC | 0xA1)
  92
  93 #define PF_X                    1
  94 #define PF_W                    2
  95 #define PF_R                    4
  96
  97 struct elf_program
  98 {
  99   uint32 type;
 100   uint32 offset;
 101   uint32 vaddr;
 102   uint32 paddr;
 103   uint32 filesz;
 104   uint32 memsz;
 105   uint32 flags;
 106   uint32 align;
 107
 108   const uint8 *data;
 109 };
 110
 111
 112 /* MIPS Reloc Entry Types */
 113 #define R_MIPS_NONE     0
 114 #define R_MIPS_16       1
 115 #define R_MIPS_32       2
 116 #define R_MIPS_26       4
 117 #define R_MIPS_HI16     5
 118 #define R_MIPS_LO16     6
 119 #define R_MIPSX_HI16   13
 120 #define R_MIPSX_J26    14
 121 #define R_MIPSX_JAL26  15
 122
 123
 124 struct prx_reloc {
 125   uint32 offset;
 126   uint8 type;
 127   uint8 offsbase;
 128   uint8 addrbase;
 129   uint8 extra;
 130   uint32 addend;
 131   uint32 vaddr;
 132   uint32 target;
 133 };
 134
 135 struct prx_modinfo {
 136
 137   uint16 attributes;
 138   uint16 version;
 139   uint32 gp;
 140   uint32 expvaddr;
 141   uint32 expvaddrbtm;
 142   uint32 impvaddr;
 143   uint32 impvaddrbtm;
 144
 145   uint32 numimports;
 146   uint32 numexports;
 147
 148   struct prx_import *imports;
 149   struct prx_export *exports;
 150
 151   const char *name;
 152 };
 153
 154 struct prx_import {
 155
 156   uint32 namevaddr;
 157   uint32 flags;
 158   uint8  size;
 159   uint8  nvars;
 160   uint16 nfuncs;
 161   uint32 nidsvaddr;
 162   uint32 funcsvaddr;
 163   uint32 varsvaddr;
 164
 165   struct prx_function *funcs;
 166   struct prx_variable *vars;
 167
 168   const char *name;
 169
 170 };
 171
 172 struct prx_export {
 173   uint32 namevaddr;
 174   uint32 flags;
 175   uint8 size;
 176   uint8 nvars;
 177   uint16 nfuncs;
 178   uint32 expvaddr;
 179
 180   struct prx_function *funcs;
 181   struct prx_variable *vars;
 182
 183   const char *name;
 184 };
 185
 186 struct prx_function {
 187   uint32 vaddr;
 188   uint32 nid;
 189   const char *name;
 190   const char *libname;
 191   void *pfunc;
 192   int numargs;
 193 };
 194
 195 struct prx_variable {
 196   uint32 vaddr;
 197   uint32 nid;
 198   const char *name;
 199   const char *libname;
 200 };
 201
 202 uint32 read_uint32_le (const uint8 *bytes);
 203 uint16 read_uint16_le (const uint8 *bytes);
 204 void write_uint32_le (uint8 *bytes, uint32 val);
 205
 206 struct prx *prx_load (const char *path);
 207 void prx_free (struct prx *p);
 208 void prx_print (struct prx *p, int prtrelocs);
 209
 210 void prx_resolve_nids (struct prx *p, struct nidstable *nids);
 211
 212 uint32 prx_translate (struct prx *p, uint32 vaddr);
 213
 214 int prx_inside_prx (struct prx *p, uint32 offset, uint32 size);
 215 int prx_inside_progfile (struct elf_program *program, uint32 vaddr, uint32 size);
 216 int prx_inside_progmem (struct elf_program *program, uint32 vaddr, uint32 size);
 217 int prx_inside_strprogfile (struct elf_program *program, uint32 vaddr);
 218
 219 uint32 prx_findreloc (struct prx *p, uint32 target);
 220 uint32 prx_findrelocbyaddr (struct prx *p, uint32 vaddr);
 221
 222
 223
 224 #endif /* __PRX_H */