diff options
Diffstat (limited to 'lib/mipsobj.cpp')
| -rw-r--r-- | lib/mipsobj.cpp | 269 |
1 files changed, 269 insertions, 0 deletions
diff --git a/lib/mipsobj.cpp b/lib/mipsobj.cpp new file mode 100644 index 0000000..97663e6 --- /dev/null +++ b/lib/mipsobj.cpp @@ -0,0 +1,269 @@ +#include "mipsobj.h" + +section::section(const String & _name, int _type) : name(_name), type(_type), datas(0), length(0) { } +section::section() : name(""), type(-1), datas(0), length(0) { } + +section::~section() { + if (datas) + free(datas); +} + +void section::setname(const String & _name) { + name = _name; +} + +void section::settype(int _type) { + type = _type; +} + +void section::putdatas(const Uint8 * _datas, int _length) { + if (type != BSS) { + datas = (Uint8 *) realloc(datas, length + _length); + memcpy(datas + length, _datas, _length); + } + length += _length; +} + +int section::gettype() { + return type; +} + +int section::getsize() { + return length; +} + +const Uint8 * section::getdatas() { + return datas; +} + +void section::putreloc(const String & _symbol, int _type, Uint32 _offset) { + struct reloc_t r; + + r.symbol = _symbol; + r.type = _type; + r.offset = _offset; + + putreloc(r); +} + +void section::putreloc(const struct reloc_t & r) { + relocs.push_back(r); +} + +mipsobj::mipsobj() : loaded(false) { } + +mipsobj::~mipsobj() { } + +void loadELF(Handle * elf) throw (GeneralException) { +} + +#define OBJSIG 0x024b4e4c + +#define READNAME(_str, _file) { \ + char _name[256]; \ + int _len; \ + \ + _len = _file->readU8(); \ + _file->read(_name, _len); \ + _name[_len] = 0; \ + _str = _name; \ +} + +void mipsobj::loadOBJ(Handle * obj) throw (GeneralException) { + int cursec, len, reloctype, relocexpr, id; + bool eof = false; + std::map<int, String> secnames; + std::map<int, String> symbolnames; + Uint8 * datas; + struct reloc_t reloc; + struct symbol_t symbol; + String name; + + while (!eof) { + int entryid = obj->readU8(); + + switch (entryid) { + case 0x00: + eof = true; + break; + + case 0x02: + len = obj->readU16(); + datas = (Uint8 *) malloc(len); + + obj->read(datas, len); + sections[secnames[cursec]].putdatas(datas, len); + + free(datas); + break; + + case 0x06: + cursec = obj->readU16(); + break; + + case 0x08: + len = obj->readU32(); + + sections[secnames[cursec]].putdatas(0, len); + break; + + case 0x0a: + reloctype = obj->readU8(); + reloc.offset = obj->readU16(); + + switch (reloctype) { + case 0x10: + reloc.type = R_MIPS_32; + break; + case 0x4a: + reloc.type = R_MIPS_26; + break; + case 0x52: + reloc.type = R_MIPS_HI16; + break; + case 0x54: + reloc.type = R_MIPS_LO16; + break; + case 0x0a: + case 0x26: + case 0x28: + case 0x64: + printm(M_ERROR, "Relocation type %02x not supported.\n", reloctype); + exit(-1); + break; + default: + printm(M_ERROR, "Relocation type %02x UNKNOWN! Please send the object to the author.\n", reloctype); + exit(-1); + } + + relocexpr = obj->readU8(); + + switch (relocexpr) { + case 0x02: + reloc.symbol = symbolnames[obj->readU16()]; + break; + case 0x04: + reloc.symbol = secnames[obj->readU16()]; + break; + case 0x00: + case 0x0c: + case 0x16: + case 0x2c: + case 0x2e: + case 0x30: + case 0x32: + case 0x36: + printm(M_ERROR, "Relocation expression %02x not supported.\n", relocexpr); + exit(-1); + break; + default: + printm(M_ERROR, "Relocation expression %02x UNKNOWN! Please mail the author.\n", relocexpr); + exit(-1); + break; + } + + sections[secnames[cursec]].relocs.push_back(reloc); + + break; + + case 0x0c: + id = obj->readU16(); + symbol.section = obj->readU16(); + symbol.offset = obj->readU32(); + READNAME(symbol.name, obj); + symbol.type = GLOBAL; + + symbolnames[id] = symbol.name; + + break; + + case 0x0e: + id = obj->readU16(); + READNAME(symbol.name, obj); + symbol.type = EXTERN; + + symbolnames[id] = symbol.name; + + break; + + case 0x10: + id = obj->readU16(); + obj->readU8(); + obj->readU16(); + READNAME(name, obj); + + secnames[id] = name; + + break; + + case 0x12: + printm(M_WARNING, "Local symbol not supported.\n"); + obj->readU16(); + obj->readU32(); + READNAME(name, obj); + break; + + case 0x1c: + printm(M_WARNING, "File number and name not supported.\n"); + obj->readU16(); + READNAME(name, obj); + break; + + case 0x2e: + if ((id = obj->readU8()) != 7) { + printm(M_ERROR, "CPU type %i not supported.\n", id); + exit(-1); + } + break; + + case 0x30: + printm(M_ERROR, "Constant not supported.\n"); + exit(-1); + break; + + default: + printm(M_ERROR, "Object entry type %i UNKNOWN! Please send the object to the author.\n", entryid); + exit(-1); + break; + } + } +} + +#define LIBSIG 0x0142494c + +void mipsobj::loadLIB(Handle * lib, const String & objname) throw (GeneralException) { + char _name[9]; + String name; + int hsize, size, ptr; + bool found = false; + + lib->seek(0); + + if (lib->readU32() != LIBSIG) { + throw GeneralException("Not a Psy-Q lib file"); + } + + while (lib->tell() != lib->GetSize()) { + ptr = lib->tell(); + + lib->read(_name, 8); + name = _name; + lib->seek(4, SEEK_CUR); + hsize = lib->readU32(); + size = lib->readU32(); + + if (objname == name.trim()) { + lib->seek(ptr + hsize); + found = true; + break; + } + + lib->seek(ptr + size); + } + + if (!found) { + throw GeneralException("Object `" + objname + "' not found in archive " + lib->GetName()); + } + + loadOBJ(lib); +} |