AcessNative/ld-acess_src/elf_load.c

   1 /*\r
   2  * Acess2 - AcessNative\r
   3  *\r
   4  * ELF Executable Loader Code\r
   5  */\r
   6 #define DEBUG   0\r
   7 #include <stdlib.h>\r
   8 #include <stdio.h>\r
   9 #include <string.h>\r
  10 #include <unistd.h>\r
  11 #include <inttypes.h>   // PRIx64\r
  12 #include "common.h"\r
  13 #include "elf32.h"\r
  14 #include "elf64.h"\r
  15 \r
  16 #define DEBUG_WARN      1\r
  17 \r
  18 #define MKPTR(_type,_val)       ((_type*)(uintptr_t)(_val))\r
  19 #define PTRMK(_type,_val)       MKPTR(_type,_val)\r
  20 #define PTR(_val)       ((void*)(uintptr_t)(_val))\r
  21 \r
  22 #if DEBUG\r
  23 # define ENTER(...)     printf("%s: ---- ENTER ----\n", __func__);\r
  24 # define LOG(s, ...)    printf("%s: " s, __func__, __VA_ARGS__)\r
  25 # define LOGS(s)        printf("%s: " s, __func__)\r
  26 # define LEAVE(...)     printf("%s: ---- LEAVE ----\n", __func__);\r
  27 #else\r
  28 # define ENTER(...)\r
  29 # define LOG(...)\r
  30 # define LOGS(...)\r
  31 # define LEAVE(...)\r
  32 #endif\r
  33 \r
  34 // === PROTOTYPES ===\r
  35 void    *Elf_Load(int FD);\r
  36 void    *Elf32Load(int FD, Elf32_Ehdr *hdr);\r
  37 void    *Elf64Load(int FD, Elf64_Ehdr *hdr);\r
  38 \r
  39 // === CODE ===\r
  40 void *Elf_Load(int FD)\r
  41 {\r
  42         Elf64_Ehdr      hdr;\r
  43         \r
  44         // Read ELF Header\r
  45         acess__SysRead(FD, &hdr, sizeof(hdr));\r
  46         \r
  47         // Check the file type\r
  48         if(hdr.e_ident[0] != 0x7F || hdr.e_ident[1] != 'E' || hdr.e_ident[2] != 'L' || hdr.e_ident[3] != 'F') {\r
  49                 Warning("Non-ELF File was passed to the ELF loader\n");\r
  50                 return NULL;\r
  51         }\r
  52 \r
  53         switch(hdr.e_ident[4])\r
  54         {\r
  55         case ELFCLASS32:\r
  56                 return Elf32Load(FD, (void*)&hdr);\r
  57         case ELFCLASS64:\r
  58                 return Elf64Load(FD, &hdr);\r
  59         default:\r
  60                 Warning("Unknown ELF class (%i)", hdr.e_ident[4]);\r
  61                 return NULL;\r
  62         }\r
  63 }\r
  64 \r
  65 void *Elf32Load(int FD, Elf32_Ehdr *hdr)\r
  66 {\r
  67         Elf32_Phdr      *phtab;\r
  68          int    i;\r
  69          int    iPageCount;\r
  70         uint32_t        max, base;\r
  71         uint32_t        addr;\r
  72         uint32_t        baseDiff = 0;\r
  73         \r
  74         ENTER("iFD", FD);\r
  75         \r
  76         // Check for a program header\r
  77         if(hdr->e_phoff == 0) {\r
  78                 #if DEBUG_WARN\r
  79                 Warning("ELF File does not contain a program header\n");\r
  80                 #endif\r
  81                 LEAVE('n');\r
  82                 return NULL;\r
  83         }\r
  84         \r
  85         // Read Program Header Table\r
  86         phtab = malloc( sizeof(Elf32_Phdr) * hdr->e_phnum );\r
  87         if( !phtab ) {\r
  88                 LEAVE('n');\r
  89                 return NULL;\r
  90         }\r
  91         LOG("hdr.e_phoff = 0x%08x\n", hdr->e_phoff);\r
  92         acess__SysSeek(FD, hdr->e_phoff, ACESS_SEEK_SET);\r
  93         acess__SysRead(FD, phtab, sizeof(Elf32_Phdr) * hdr->e_phnum);\r
  94         \r
  95         // Count Pages\r
  96         iPageCount = 0;\r
  97         LOG("hdr.e_phnum = %i\n", hdr->e_phnum);\r
  98         for( i = 0; i < hdr->e_phnum; i++ )\r
  99         {\r
 100                 // Ignore Non-LOAD types\r
 101                 if(phtab[i].p_type != PT_LOAD)\r
 102                         continue;\r
 103                 iPageCount += ((phtab[i].p_vaddr&0xFFF) + phtab[i].p_memsz + 0xFFF) >> 12;\r
 104                 LOG("phtab[%i] = {p_vaddr:0x%x, p_memsz:0x%x}\n", i, phtab[i].p_vaddr, phtab[i].MemSize);\r
 105         }\r
 106         \r
 107         LOG("iPageCount = %i\n", iPageCount);\r
 108         \r
 109         // Allocate Information Structure\r
 110         //ret = malloc( sizeof(tBinary) + sizeof(tBinaryPage)*iPageCount );\r
 111         // Fill Info Struct\r
 112         //ret->Entry = hdr.entrypoint;\r
 113         //ret->Base = -1;               // Set Base to maximum value\r
 114         //ret->NumPages = iPageCount;\r
 115         //ret->Interpreter = NULL;\r
 116 \r
 117         // Prescan for base and size\r
 118         max = 0;\r
 119         base = 0xFFFFFFFF;\r
 120         for( i = 0; i < hdr->e_phnum; i ++)\r
 121         {\r
 122                 if( phtab[i].p_type != PT_LOAD )\r
 123                         continue;\r
 124                 if( phtab[i].p_vaddr < base )\r
 125                         base = phtab[i].p_vaddr;\r
 126                 if( phtab[i].p_vaddr + phtab[i].p_memsz > max )\r
 127                         max = phtab[i].p_vaddr + phtab[i].p_memsz;\r
 128         }\r
 129 \r
 130         LOG("base = %08x, max = %08x\n", base, max);\r
 131 \r
 132         if( base == 0 ) {\r
 133                 // Find a nice space (47 address bits allowed)\r
 134                 base = FindFreeRange( max, 47 );\r
 135                 LOG("new base = %08x\n", base);\r
 136                 if( base == 0 ) return NULL;\r
 137                 baseDiff = base;\r
 138         }\r
 139         \r
 140         // Load Pages\r
 141         for( i = 0; i < hdr->e_phnum; i++ )\r
 142         {\r
 143                 // Get Interpreter Name\r
 144                 if( phtab[i].p_type == PT_INTERP )\r
 145                 {\r
 146                         char *tmp;\r
 147                         //if(ret->Interpreter)  continue;\r
 148                         tmp = malloc(phtab[i].p_filesz);\r
 149                         acess__SysSeek(FD, phtab[i].p_offset, ACESS_SEEK_SET);\r
 150                         acess__SysRead(FD, tmp, phtab[i].p_filesz);\r
 151                         //ret->Interpreter = Binary_RegInterp(tmp);\r
 152                         LOG("Interpreter '%s'\n", tmp);\r
 153                         free(tmp);\r
 154                         continue;\r
 155                 }\r
 156                 // Ignore non-LOAD types\r
 157                 if(phtab[i].p_type != PT_LOAD)  continue;\r
 158                 \r
 159                 LOG("phtab[%i] = PT_LOAD {Adj p_vaddr:0x%x, p_offset:0x%x, p_filesz:0x%x, p_memsz:0x%x}\n",\r
 160                         i, phtab[i].p_vaddr+baseDiff, phtab[i].p_offset, phtab[i].p_filesz, phtab[i].p_memsz);\r
 161                 \r
 162                 addr = phtab[i].p_vaddr + baseDiff;\r
 163 \r
 164                 if( AllocateMemory( addr, phtab[i].p_memsz ) ) {\r
 165                         fprintf(stderr, "Elf_Load: Unable to map memory at %x (0x%x bytes)\n",\r
 166                                 addr, phtab[i].p_memsz);\r
 167                         free( phtab );\r
 168                         return NULL;\r
 169                 }\r
 170                 \r
 171                 acess__SysSeek(FD, phtab[i].p_offset, ACESS_SEEK_SET);\r
 172                 acess__SysRead(FD, PTRMK(void, addr), phtab[i].p_filesz);\r
 173                 memset( PTRMK(char, addr) + phtab[i].p_filesz, 0, phtab[i].p_memsz - phtab[i].p_filesz );\r
 174         }\r
 175         \r
 176         // Clean Up\r
 177         free(phtab);\r
 178         // Return\r
 179         LEAVE('p', base);\r
 180         return PTRMK(void, base);\r
 181 }\r
 182 \r
 183 void *Elf64Load(int FD, Elf64_Ehdr *hdr)\r
 184 {\r
 185         Elf64_Phdr      *phtab;\r
 186          int    i;\r
 187          int    iPageCount;\r
 188         uint64_t        max, base;\r
 189         uint64_t        addr;\r
 190         uint64_t        baseDiff = 0;\r
 191         \r
 192         ENTER("iFD", FD);\r
 193         \r
 194         if( sizeof(void*) == 4) {\r
 195                 Warning("ELF64 being loaded in 32-bit env, this may not work");\r
 196         }\r
 197 \r
 198         // Check for a program header\r
 199         if(hdr->e_phoff == 0) {\r
 200                 #if DEBUG_WARN\r
 201                 Warning("ELF File does not contain a program header\n");\r
 202                 #endif\r
 203                 LEAVE('n');\r
 204                 return NULL;\r
 205         }\r
 206         \r
 207         // Read Program Header Table\r
 208         phtab = malloc( sizeof(Elf64_Phdr) * hdr->e_phnum );\r
 209         if( !phtab ) {\r
 210                 LEAVE('n');\r
 211                 return NULL;\r
 212         }\r
 213         LOG("hdr.e_phoff = 0x%08llx\n", (long long)hdr->e_phoff);\r
 214         acess__SysSeek(FD, hdr->e_phoff, ACESS_SEEK_SET);\r
 215         acess__SysRead(FD, phtab, sizeof(Elf64_Phdr) * hdr->e_phnum);\r
 216         \r
 217         // Count Pages\r
 218         iPageCount = 0;\r
 219         LOG("hdr.e_phnum = %i\n", hdr->e_phnum);\r
 220         for( i = 0; i < hdr->e_phnum; i++ )\r
 221         {\r
 222                 // Ignore Non-LOAD types\r
 223                 if(phtab[i].p_type != PT_LOAD)\r
 224                         continue;\r
 225                 iPageCount += ((phtab[i].p_vaddr&0xFFF) + phtab[i].p_memsz + 0xFFF) >> 12;\r
 226                 LOG("phtab[%i] = {p_vaddr:0x%llx, p_memsz:0x%llx}\n",\r
 227                         i, (long long)phtab[i].p_vaddr, (long long)phtab[i].p_memsz);\r
 228         }\r
 229         \r
 230         LOG("iPageCount = %i\n", iPageCount);\r
 231         \r
 232         // Allocate Information Structure\r
 233         //ret = malloc( sizeof(tBinary) + sizeof(tBinaryPage)*iPageCount );\r
 234         // Fill Info Struct\r
 235         //ret->Entry = hdr.entrypoint;\r
 236         //ret->Base = -1;               // Set Base to maximum value\r
 237         //ret->NumPages = iPageCount;\r
 238         //ret->Interpreter = NULL;\r
 239 \r
 240         // Prescan for base and size\r
 241         max = 0;\r
 242         base = 0xFFFFFFFF;\r
 243         for( i = 0; i < hdr->e_phnum; i ++)\r
 244         {\r
 245                 if( phtab[i].p_type != PT_LOAD )\r
 246                         continue;\r
 247                 if( phtab[i].p_vaddr < base )\r
 248                         base = phtab[i].p_vaddr;\r
 249                 if( phtab[i].p_vaddr + phtab[i].p_memsz > max )\r
 250                         max = phtab[i].p_vaddr + phtab[i].p_memsz;\r
 251         }\r
 252 \r
 253         LOG("base = %08lx, max = %08lx\n", base, max);\r
 254 \r
 255         if( base == 0 ) {\r
 256                 // Find a nice space (31 address bits allowed)\r
 257                 base = FindFreeRange( max, 31 );\r
 258                 LOG("new base = %08lx\n", base);\r
 259                 if( base == 0 ) return NULL;\r
 260                 baseDiff = base;\r
 261         }\r
 262         \r
 263         // Load Pages\r
 264         for( i = 0; i < hdr->e_phnum; i++ )\r
 265         {\r
 266                 // Get Interpreter Name\r
 267                 if( phtab[i].p_type == PT_INTERP )\r
 268                 {\r
 269                         char *tmp;\r
 270                         //if(ret->Interpreter)  continue;\r
 271                         tmp = malloc(phtab[i].p_filesz+1);\r
 272                         tmp[ phtab[i].p_filesz ] = 0;\r
 273                         acess__SysSeek(FD, phtab[i].p_offset, ACESS_SEEK_SET);\r
 274                         acess__SysRead(FD, tmp, phtab[i].p_filesz);\r
 275                         //ret->Interpreter = Binary_RegInterp(tmp);\r
 276                         LOG("Interpreter '%s'\n", tmp);\r
 277                         free(tmp);\r
 278                         continue;\r
 279                 }\r
 280                 // Ignore non-LOAD types\r
 281                 if(phtab[i].p_type != PT_LOAD)  continue;\r
 282                 \r
 283                 LOG("phtab[%i] = PT_LOAD {Adj p_vaddr:0x%llx, p_offset:0x%llx, p_filesz:0x%llx, p_memsz:0x%llx}\n",\r
 284                         i,\r
 285                         (long long)phtab[i].p_vaddr+baseDiff, (long long)phtab[i].p_offset,\r
 286                         (long long)phtab[i].p_filesz, (long long)phtab[i].p_memsz\r
 287                         );\r
 288                 \r
 289                 addr = phtab[i].p_vaddr + baseDiff;\r
 290 \r
 291                 if( AllocateMemory( addr, phtab[i].p_memsz ) ) {\r
 292                         fprintf(stderr, "Elf_Load: Unable to map memory at %"PRIx64" (0x%"PRIx64" bytes)\n",\r
 293                                 (uint64_t)addr, (uint64_t)phtab[i].p_memsz);\r
 294                         free( phtab );\r
 295                         return NULL;\r
 296                 }\r
 297                 \r
 298                 acess__SysSeek(FD, phtab[i].p_offset, ACESS_SEEK_SET);\r
 299                 acess__SysRead(FD, PTRMK(void, addr), phtab[i].p_filesz);\r
 300                 memset( PTRMK(char, addr) + phtab[i].p_filesz, 0, phtab[i].p_memsz - phtab[i].p_filesz );\r
 301         }\r
 302         \r
 303         // Clean Up\r
 304         free(phtab);\r
 305         // Return\r
 306         LEAVE('p', base);\r
 307         return PTRMK(void, base);\r
 308 }\r
 309 \r