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//===- GNUInfo.h ----------------------------------------------------------===//
//
// The MCLinker Project
//
// This file is distributed under the University of Illinois Open Source
// License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
#ifndef MCLD_TARGET_GNUINFO_H_
#define MCLD_TARGET_GNUINFO_H_
#include <llvm/ADT/Triple.h>
#include <llvm/Support/ELF.h>
namespace mcld {
/** \class GNUInfo
* \brief GNUInfo records ELF-dependent and target-dependnet data fields
*/
class GNUInfo {
public:
explicit GNUInfo(const llvm::Triple& pTriple);
virtual ~GNUInfo() {}
/// ELFVersion - the value of e_ident[EI_VERSION]
virtual uint8_t ELFVersion() const { return llvm::ELF::EV_CURRENT; }
/// The return value of machine() it the same as e_machine in the ELF header
virtual uint32_t machine() const = 0;
/// OSABI - the value of e_ident[EI_OSABI]
uint8_t OSABI() const;
/// ABIVersion - the value of e_ident[EI_ABIVRESION]
virtual uint8_t ABIVersion() const { return 0x0; }
/// defaultTextSegmentAddr - target should specify its own default start
/// address of the text segment. esp. for exec.
virtual uint64_t defaultTextSegmentAddr() const { return 0x0; }
/// flags - the value of ElfXX_Ehdr::e_flags
virtual uint64_t flags() const = 0;
/// entry - the symbol name of the entry point
virtual const char* entry() const { return "_start"; }
/// dyld - the name of the default dynamic linker
/// target may override this function if needed.
virtual const char* dyld() const { return "/usr/lib/libc.so.1"; }
/// isDefaultExecStack - target should specify whether the stack is default
/// executable. If target favors another choice, please override this function
virtual bool isDefaultExecStack() const { return true; }
/// commonPageSize - the common page size of the target machine, and we set it
/// to 4K here. If target favors the different size, please override this
virtual uint64_t commonPageSize() const { return 0x1000; }
/// abiPageSize - the abi page size of the target machine, and we set it to 4K
/// here. If target favors the different size, please override this function
virtual uint64_t abiPageSize() const { return 0x1000; }
/// stubGroupSize - the default group size to place stubs between sections.
virtual unsigned stubGroupSize() const { return 0x10000; }
protected:
const llvm::Triple& m_Triple;
};
} // namespace mcld
#endif // MCLD_TARGET_GNUINFO_H_
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