diff options
Diffstat (limited to 'elf_image.cpp')
| -rw-r--r-- | elf_image.cpp | 172 |
1 files changed, 0 insertions, 172 deletions
diff --git a/elf_image.cpp b/elf_image.cpp deleted file mode 100644 index 6db72f3..0000000 --- a/elf_image.cpp +++ /dev/null @@ -1,172 +0,0 @@ -/* SPDX-License-Identifier: Unlicense - */ - -#include "elf_image.h" - -#include <cassert> -#include <cstdio> - -ELF::ProgramHeader32Table ELF::ProgramHeader32Table::FromBytes( - const DataView &d, const DataEncoding e) -{ - if (d.buffer == nullptr || d.size == 0) { - return ELF::ProgramHeader32Table{}; - } - assert(d.size % kProgramHeaderSize == 0); - const size_t size = d.size / kProgramHeaderSize; - auto *headers = new ProgramHeader32[size]; - assert(headers != nullptr); - for (size_t i = 0; i < size; i++) { - headers[i] = ProgramHeader32::FromBytes(d.buffer + i * kProgramHeaderSize, e); - } - return ELF::ProgramHeader32Table{ headers, size, }; -} - -static char *ValidateELF(const DataView& d) -{ - char *error; - size_t size; - FILE *s = open_memstream(&error, &size); - assert(s); - using namespace ELF; - if (d.size < kHeaderSize) { - fprintf( - s, - "data size (%zu) is lower than minimum ELF header size (%zu): " - "ELF header could not fit", - d.size, - kHeaderSize); - fclose(s); - return error; - } - const auto header_raw = Header32Raw::FromBytes(d.buffer); - const auto header = Header32::FromBytes(d.buffer); - if (!MagicIsValid(header.ident.magic)) { - const uint8_t *m = header.ident.magic; - fprintf( - s, - "ELF Magic is invalid: expected [%02x %02x %02x %02x], got [%02x %02x %02x %02x]", - 0x7f, 'E', 'L', 'F', - m[0], m[1], m[2], m[3]); - fclose(s); - return error; - } - if (header.ident.version != Version::kCurrent) { - fprintf( - s, - "version (0x%02x) of ELF header.ident.version is not supported, " - "only \"Current\" version (0x%02x) is supported", - header_raw.ident.version, - static_cast<int>(Version::kCurrent)); - fclose(s); - return error; - } - if (header.version != Version::kCurrent) { - fprintf( - s, - "version (0x%02x) of ELF header.version is not supported, " - "only \"Current\" version (0x%02x) is supported", - header_raw.version, - static_cast<int>(Version::kCurrent)); - fclose(s); - return error; - } - if (header.type != ObjectType::kExec) { - fprintf( - s, - "object type (0x%02x) is not supported, " - "only Exec (0x%02x) object type is supported", - header_raw.type, - static_cast<int>(ObjectType::kExec)); - fclose(s); - return error; - } - if (header.machine != Machine::k68k) { - fprintf( - s, - "machine (0x%02x) is not supported, " - "only Motorola 68k (0x%02x) machine is supported", - header_raw.machine, - static_cast<int>(Machine::k68k)); - fclose(s); - return error; - } - if (header.phentsize != kProgramHeaderSize) { - fprintf( - s, - "phentsize is invalid: expected (%zu), got (%zu)", - kProgramHeaderSize, - size_t(header.phentsize)); - fclose(s); - return error; - } - if (d.size < header.phoff + header.phentsize * header.phnum) { - fprintf( - s, - "data size (%zu) is lower than program header table end offset (%zu): " - "program header table could not fit", - d.size, - size_t(header.phoff + header.phentsize * header.phnum)); - fclose(s); - return error; - } - bool has_segment_with_entry = false; - for (size_t i = 0; i < header.phnum; i++) { - const auto ph = ProgramHeader32::FromBytes( - d.buffer + header.phoff + header.phentsize * i, header.ident.data_encoding); - if (d.size < ph.offset + ph.filesz) { - fprintf( - s, - "data size (%zu) is lower than pht[%zu] segment end offset (%zu): " - "segment could not fit", - d.size, - i, - size_t(ph.offset + ph.filesz)); - fclose(s); - return error; - } - const bool is_code = (ph.flags & (kPHFlagX | kPHFlagW | kPHFlagR)) == (kPHFlagX | kPHFlagR); - if (ParsePHType(ph.type) == PHType::kLoad && is_code && ph.vaddr != 0) { - fprintf( - s, - "pht[%zu] segment is a code, but it's vaddr (0x%08x) is not zero: " - "non-zero base address is not supported", - i, - ph.vaddr); - fclose(s); - return error; - } - const bool contains_entry = header.entry >= ph.vaddr && header.entry < ph.vaddr + ph.memsz; - if (ParsePHType(ph.type) == PHType::kLoad && is_code && contains_entry) { - has_segment_with_entry = true; - } - } - if (!has_segment_with_entry) { - fprintf(s, "no code segments containing entry point (0x%08x) found", header.entry); - fclose(s); - return error; - } - fclose(s); - free(error); - return nullptr; -} - -ELF::Image::Image(DataBuffer&& data) - : _data(static_cast<DataBuffer&&>(data)) - , _error(ValidateELF(_data.View())) - , _h(_error ? ELF::Header32{} : ELF::Header32::FromBytes(_data.View().buffer)) - , _pht(_error - ? ELF::ProgramHeader32Table{} - : ELF::ProgramHeader32Table::FromBytes( - _data.View(_h.phoff, _h.phnum * kProgramHeaderSize), _h.ident.data_encoding)) -{} - -ELF::Image::~Image() -{ - if (_error) { - free(_error); - } - if (_pht.headers) { - delete [] _pht.headers; - } -} |