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New function
2006-08-20 Soren Sandmann <sandmann@daimi.au.dk> * elfparser.c (elf_parser_get_debug_link): New function * elfparser.c: Delete SymbolTable typedef * binparser.[ch] (bin_parser_get_data): New function (bin_parser_get_length): New function * elfparser.[ch] (elf_parser_get_crc32): New function * TODO: Updates * elfparser.c (elf_parser_lookup_symbol): Offset passed in addresses by the load address. * elfparser.c (elf_parser_get_load_address): New function to compute the load address of the beginning of the file.
This commit is contained in:
Soren Sandmann
committed by
Søren Sandmann Pedersen
Søren Sandmann Pedersen
parent
49e1fabe46
commit
1b72901c4d
206
elfparser.c
206
elfparser.c
@ -4,13 +4,8 @@
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#include "binparser.h"
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#include "elfparser.h"
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typedef struct SymbolTable SymbolTable;
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typedef struct Section Section;
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struct SymbolTable
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{
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};
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struct ElfSym
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{
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gulong offset;
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@ -22,23 +17,25 @@ struct Section
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const gchar * name;
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gsize offset;
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gsize size;
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gboolean allocated;
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gulong load_address;
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};
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struct ElfParser
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{
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BinParser * parser;
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BinParser * parser;
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BinFormat * header;
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BinFormat * strtab_format;
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BinFormat * shn_entry;
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BinFormat * sym_format;
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BinFormat * header;
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BinFormat * strtab_format;
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BinFormat * shn_entry;
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BinFormat * sym_format;
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int n_sections;
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Section ** sections;
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int n_sections;
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Section ** sections;
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int n_symbols;
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ElfSym * symbols;
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gsize sym_strings;
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int n_symbols;
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ElfSym * symbols;
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gsize sym_strings;
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};
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static gboolean parse_elf_signature (const guchar *data, gsize length,
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@ -72,11 +69,20 @@ section_new (ElfParser *parser,
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{
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BinParser *bparser = parser->parser;
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Section *section = g_new (Section, 1);
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guint64 flags;
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section->name = get_string (bparser, name_table, "sh_name");
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section->size = bin_parser_get_uint (bparser, "sh_size");
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section->offset = bin_parser_get_uint (bparser, "sh_offset");
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flags = bin_parser_get_uint (bparser, "sh_flags");
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section->allocated = !!(flags & SHF_ALLOC);
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if (section->allocated)
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section->load_address = bin_parser_get_uint (bparser, "sh_addr");
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else
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section->load_address = 0;
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return section;
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}
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@ -158,6 +164,70 @@ elf_parser_new (const guchar *data, gsize length)
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return parser;
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}
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guint32
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elf_parser_get_crc32 (ElfParser *parser)
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{
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static const unsigned long crc32_table[256] = {
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0x00000000, 0x77073096, 0xee0e612c, 0x990951ba, 0x076dc419, 0x706af48f,
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0xe963a535, 0x9e6495a3, 0x0edb8832, 0x79dcb8a4, 0xe0d5e91e, 0x97d2d988,
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0x09b64c2b, 0x7eb17cbd, 0xe7b82d07, 0x90bf1d91, 0x1db71064, 0x6ab020f2,
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0xf3b97148, 0x84be41de, 0x1adad47d, 0x6ddde4eb, 0xf4d4b551, 0x83d385c7,
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0x136c9856, 0x646ba8c0, 0xfd62f97a, 0x8a65c9ec, 0x14015c4f, 0x63066cd9,
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0xfa0f3d63, 0x8d080df5, 0x3b6e20c8, 0x4c69105e, 0xd56041e4, 0xa2677172,
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0x3c03e4d1, 0x4b04d447, 0xd20d85fd, 0xa50ab56b, 0x35b5a8fa, 0x42b2986c,
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0xdbbbc9d6, 0xacbcf940, 0x32d86ce3, 0x45df5c75, 0xdcd60dcf, 0xabd13d59,
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0x26d930ac, 0x51de003a, 0xc8d75180, 0xbfd06116, 0x21b4f4b5, 0x56b3c423,
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0xcfba9599, 0xb8bda50f, 0x2802b89e, 0x5f058808, 0xc60cd9b2, 0xb10be924,
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0x2f6f7c87, 0x58684c11, 0xc1611dab, 0xb6662d3d, 0x76dc4190, 0x01db7106,
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0x98d220bc, 0xefd5102a, 0x71b18589, 0x06b6b51f, 0x9fbfe4a5, 0xe8b8d433,
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0x7807c9a2, 0x0f00f934, 0x9609a88e, 0xe10e9818, 0x7f6a0dbb, 0x086d3d2d,
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0x91646c97, 0xe6635c01, 0x6b6b51f4, 0x1c6c6162, 0x856530d8, 0xf262004e,
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0x6c0695ed, 0x1b01a57b, 0x8208f4c1, 0xf50fc457, 0x65b0d9c6, 0x12b7e950,
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0x8bbeb8ea, 0xfcb9887c, 0x62dd1ddf, 0x15da2d49, 0x8cd37cf3, 0xfbd44c65,
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0x4db26158, 0x3ab551ce, 0xa3bc0074, 0xd4bb30e2, 0x4adfa541, 0x3dd895d7,
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0xa4d1c46d, 0xd3d6f4fb, 0x4369e96a, 0x346ed9fc, 0xad678846, 0xda60b8d0,
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0x44042d73, 0x33031de5, 0xaa0a4c5f, 0xdd0d7cc9, 0x5005713c, 0x270241aa,
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0xbe0b1010, 0xc90c2086, 0x5768b525, 0x206f85b3, 0xb966d409, 0xce61e49f,
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0x5edef90e, 0x29d9c998, 0xb0d09822, 0xc7d7a8b4, 0x59b33d17, 0x2eb40d81,
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0xb7bd5c3b, 0xc0ba6cad, 0xedb88320, 0x9abfb3b6, 0x03b6e20c, 0x74b1d29a,
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0xead54739, 0x9dd277af, 0x04db2615, 0x73dc1683, 0xe3630b12, 0x94643b84,
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0x0d6d6a3e, 0x7a6a5aa8, 0xe40ecf0b, 0x9309ff9d, 0x0a00ae27, 0x7d079eb1,
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0xf00f9344, 0x8708a3d2, 0x1e01f268, 0x6906c2fe, 0xf762575d, 0x806567cb,
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0x196c3671, 0x6e6b06e7, 0xfed41b76, 0x89d32be0, 0x10da7a5a, 0x67dd4acc,
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0xf9b9df6f, 0x8ebeeff9, 0x17b7be43, 0x60b08ed5, 0xd6d6a3e8, 0xa1d1937e,
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0x38d8c2c4, 0x4fdff252, 0xd1bb67f1, 0xa6bc5767, 0x3fb506dd, 0x48b2364b,
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0xd80d2bda, 0xaf0a1b4c, 0x36034af6, 0x41047a60, 0xdf60efc3, 0xa867df55,
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0x316e8eef, 0x4669be79, 0xcb61b38c, 0xbc66831a, 0x256fd2a0, 0x5268e236,
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0xcc0c7795, 0xbb0b4703, 0x220216b9, 0x5505262f, 0xc5ba3bbe, 0xb2bd0b28,
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0x2bb45a92, 0x5cb36a04, 0xc2d7ffa7, 0xb5d0cf31, 0x2cd99e8b, 0x5bdeae1d,
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0x9b64c2b0, 0xec63f226, 0x756aa39c, 0x026d930a, 0x9c0906a9, 0xeb0e363f,
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0x72076785, 0x05005713, 0x95bf4a82, 0xe2b87a14, 0x7bb12bae, 0x0cb61b38,
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0x92d28e9b, 0xe5d5be0d, 0x7cdcefb7, 0x0bdbdf21, 0x86d3d2d4, 0xf1d4e242,
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0x68ddb3f8, 0x1fda836e, 0x81be16cd, 0xf6b9265b, 0x6fb077e1, 0x18b74777,
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0x88085ae6, 0xff0f6a70, 0x66063bca, 0x11010b5c, 0x8f659eff, 0xf862ae69,
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0x616bffd3, 0x166ccf45, 0xa00ae278, 0xd70dd2ee, 0x4e048354, 0x3903b3c2,
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0xa7672661, 0xd06016f7, 0x4969474d, 0x3e6e77db, 0xaed16a4a, 0xd9d65adc,
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0x40df0b66, 0x37d83bf0, 0xa9bcae53, 0xdebb9ec5, 0x47b2cf7f, 0x30b5ffe9,
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0xbdbdf21c, 0xcabac28a, 0x53b39330, 0x24b4a3a6, 0xbad03605, 0xcdd70693,
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0x54de5729, 0x23d967bf, 0xb3667a2e, 0xc4614ab8, 0x5d681b02, 0x2a6f2b94,
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0xb40bbe37, 0xc30c8ea1, 0x5a05df1b, 0x2d02ef8d
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};
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const guchar *data;
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gsize length;
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gulong crc;
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gsize i;
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data = bin_parser_get_data (parser->parser);
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length = bin_parser_get_length (parser->parser);
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crc = 0;
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for (i = 0; i < length; ++i)
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crc = crc32_table[(crc ^ data[i]) & 0xff] ^ (crc >> 8);
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return crc & 0xFFFFFFFF;
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}
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void
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elf_parser_free (ElfParser *parser)
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{
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@ -292,8 +362,37 @@ read_symbols (ElfParser *parser)
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}
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}
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/*
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* Returns the address that the start of the file would be loaded
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* at if the whole file was mapped
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*/
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static gulong
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elf_parser_get_load_address (ElfParser *parser)
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{
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int i;
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gulong load_address = (gulong)-1;
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for (i = 0; i < parser->n_sections; ++i)
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{
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Section *section = parser->sections[i];
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if (section->allocated)
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{
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gulong addr = section->load_address - section->offset;
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load_address = MIN (load_address, addr);
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}
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}
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g_print ("load address is: %8p\n", (void *)load_address);
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return load_address;
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}
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static ElfSym *
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do_lookup (ElfSym *symbols, gulong address, int first, int last)
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do_lookup (ElfSym *symbols,
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gulong address,
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int first,
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int last)
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{
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if (address >= symbols[last].address)
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{
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@ -316,13 +415,9 @@ do_lookup (ElfSym *symbols, gulong address, int first, int last)
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int mid = (first + last) / 2;
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if (symbols[mid].address > address)
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{
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return do_lookup (symbols, address, first, mid);
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}
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else
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{
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return do_lookup (symbols, address, mid, last);
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}
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}
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}
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@ -336,8 +431,15 @@ elf_parser_lookup_symbol (ElfParser *parser,
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if (parser->n_symbols == 0)
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return NULL;
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/* FIXME: we should offset address based on the files load address */
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address += elf_parser_get_load_address (parser);
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#if 0
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g_print ("the address we are looking up is %p\n", address);
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#endif
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/* FIXME: we should look at the symbol size and check if the
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* address is actually within the function.
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*/
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return do_lookup (parser->symbols, address, 0, parser->n_symbols - 1);
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}
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@ -363,6 +465,68 @@ parser_from_sym (const ElfSym *sym)
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return NULL;
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}
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const char *
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elf_parser_get_debug_link (ElfParser *parser, guint32 *crc32)
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{
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const Section *debug_link = find_section (parser, ".gnu_debuglink");
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const gchar *result;
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gsize crc_offset;
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if (!debug_link)
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return NULL;
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bin_parser_begin (parser->parser, NULL, debug_link->offset);
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result = bin_parser_get_string (parser->parser);
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bin_parser_end (parser->parser);
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crc_offset = strlen (result) + 1;
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crc_offset = (crc_offset + 3) & ~3;
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/* FIXME: This is broken for two reasons:
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*
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* (1) It assumes file_endian==machine_endian
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*
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* (2) It doesn't check for file overrun.
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*
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* The fix is to make binparser capable of dealing with stuff
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* outside of records.
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*/
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*crc32 = *(guint32 *)(result + crc_offset);
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return result;
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}
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#if 0
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get_debug_link_info (bfd *abfd, unsigned long *crc32_out)
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{
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asection *sect;
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bfd_size_type debuglink_size;
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unsigned long crc32;
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char *contents;
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int crc_offset;
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sect = bfd_get_section_by_name (abfd, ".gnu_debuglink");
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if (sect == NULL)
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return NULL;
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debuglink_size = bfd_section_size (abfd, sect);
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contents = g_malloc (debuglink_size);
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bfd_get_section_contents (abfd, sect, contents,
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(file_ptr)0, (bfd_size_type)debuglink_size);
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/* Crc value is stored after the filename, aligned up to 4 bytes. */
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crc_offset = strlen (contents) + 1;
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crc_offset = (crc_offset + 3) & ~3;
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crc32 = bfd_get_32 (abfd, (bfd_byte *) (contents + crc_offset));
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*crc32_out = crc32;
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return contents;
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}
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#endif
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const char *
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elf_sym_get_name (const ElfSym *sym)
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{
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