diff options
Diffstat (limited to 'tools/ramscrgen/elf.cpp')
| -rw-r--r-- | tools/ramscrgen/elf.cpp | 101 |
1 files changed, 89 insertions, 12 deletions
diff --git a/tools/ramscrgen/elf.cpp b/tools/ramscrgen/elf.cpp index 7599fe0..7e78704 100644 --- a/tools/ramscrgen/elf.cpp +++ b/tools/ramscrgen/elf.cpp @@ -10,6 +10,8 @@ #define SHN_COMMON 0xFFF2 static std::string s_elfPath; +static std::string s_archiveFilePath; +static std::string s_archiveObjectPath; static FILE *s_file; @@ -22,6 +24,7 @@ static std::uint32_t s_symtabOffset; static std::uint32_t s_strtabOffset; static std::uint32_t s_symbolCount; +static std::uint32_t s_elfFileOffset; struct Symbol { @@ -31,7 +34,7 @@ struct Symbol static void Seek(long offset) { - if (std::fseek(s_file, offset, SEEK_SET) != 0) + if (std::fseek(s_file, s_elfFileOffset + offset, SEEK_SET) != 0) FATAL_ERROR("error: failed to seek to %ld in \"%s\"", offset, s_elfPath.c_str()); } @@ -98,6 +101,18 @@ static void VerifyElfIdent() FATAL_ERROR("error: \"%s\" not little-endian ELF\n", s_elfPath.c_str()); } +static void VerifyAr() +{ + char expectedMagic[8] = {'!', '<', 'a', 'r', 'c', 'h', '>', '\n'}; + char magic[8]; + + if (std::fread(magic, 8, 1, s_file) != 1) + FATAL_ERROR("error: failed to read AR magic from \"%s\"\n", s_archiveFilePath.c_str()); + + if (std::memcmp(magic, expectedMagic, 8) != 0) + FATAL_ERROR("error: AR magic did not match in \"%s\"\n", s_archiveFilePath.c_str()); +} + static void ReadElfHeader() { Seek(0x20); @@ -108,6 +123,40 @@ static void ReadElfHeader() s_shstrtabIndex = ReadInt16(); } +static void FindArObj() +{ + char file_ident[17] = {0}; + char filesize_s[11] = {0}; + char expectedEndMagic[2] = { 0x60, 0x0a }; + char end_magic[2]; + std::size_t filesize; + + Seek(8); + while (!std::feof(s_file)) { + if (std::fread(file_ident, 16, 1, s_file) != 1) + FATAL_ERROR("error: failed to read file ident in \"%s\"\n", s_archiveFilePath.c_str()); + Skip(32); + if (std::fread(filesize_s, 10, 1, s_file) != 1) + FATAL_ERROR("error: failed to read filesize in \"%s\"\n", s_archiveFilePath.c_str()); + if (std::fread(end_magic, 2, 1, s_file) != 1) + FATAL_ERROR("error: failed to read end sentinel in \"%s\"\n", s_archiveFilePath.c_str()); + if (std::memcmp(end_magic, expectedEndMagic, 2) != 0) + FATAL_ERROR("error: corrupted archive header in \"%s\" at \"%s\"\n", s_archiveFilePath.c_str(), file_ident); + + char * ptr = std::strchr(file_ident, '/'); + if (ptr != nullptr) + *ptr = 0; + filesize = std::strtoul(filesize_s, nullptr, 10); + if (std::strncmp(s_archiveObjectPath.c_str(), file_ident, 16) == 0) { + s_elfFileOffset = std::ftell(s_file); + return; + } + Skip(filesize); + } + + FATAL_ERROR("error: could not find object \"%s\" in archive \"%s\"\n", s_archiveObjectPath.c_str(), s_archiveFilePath.c_str()); +} + static std::string GetSectionName(std::uint32_t shstrtabOffset, int index) { Seek(s_sectionHeaderOffset + s_sectionHeaderEntrySize * index); @@ -153,21 +202,14 @@ static void FindTableOffsets() FATAL_ERROR("error: couldn't find .strtab section in \"%s\"\n", s_elfPath.c_str()); } -std::map<std::string, std::uint32_t> GetCommonSymbols(std::string path) +static std::map<std::string, std::uint32_t> GetCommonSymbols_Shared() { - s_elfPath = path; - - std::map<std::string, std::uint32_t> commonSymbols; - - s_file = std::fopen(s_elfPath.c_str(), "rb"); - - if (s_file == NULL) - FATAL_ERROR("error: failed to open \"%s\" for reading\n", path.c_str()); - VerifyElfIdent(); ReadElfHeader(); FindTableOffsets(); - + + std::map<std::string, std::uint32_t> commonSymbols; + std::vector<Symbol> commonSymbolVec; Seek(s_symtabOffset); @@ -193,3 +235,38 @@ std::map<std::string, std::uint32_t> GetCommonSymbols(std::string path) return commonSymbols; } + +std::map<std::string, std::uint32_t> GetCommonSymbolsFromLib(std::string sourcePath, std::string libpath) +{ + std::size_t colonPos = libpath.find(':'); + if (colonPos == std::string::npos) + FATAL_ERROR("error: missing colon separator in libfile \"%s\"\n", s_elfPath.c_str()); + + s_archiveObjectPath = libpath.substr(colonPos + 1); + s_archiveFilePath = sourcePath + "/" + libpath.substr(1, colonPos - 1); + s_elfPath = sourcePath + "/" + libpath.substr(1); + + s_file = std::fopen(s_archiveFilePath.c_str(), "rb"); + + if (s_file == NULL) + FATAL_ERROR("error: failed to open \"%s\" for reading\n", s_archiveFilePath.c_str()); + + VerifyAr(); + FindArObj(); + return GetCommonSymbols_Shared(); +} + +std::map<std::string, std::uint32_t> GetCommonSymbols(std::string sourcePath, std::string path) +{ + s_elfFileOffset = 0; + if (path[0] == '*') + return GetCommonSymbolsFromLib(sourcePath, path); + + s_elfPath = sourcePath + "/" + path; + s_file = std::fopen(s_elfPath.c_str(), "rb"); + + if (s_file == NULL) + FATAL_ERROR("error: failed to open \"%s\" for reading\n", path.c_str()); + + return GetCommonSymbols_Shared(); +} |