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#ifndef CYGONCE_LOADER_LOADER_HXX
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#define CYGONCE_LOADER_LOADER_HXX
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//==========================================================================
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//
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// loader.hxx
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//
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// ELF dynamic loader definitions
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//
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//==========================================================================
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//####ECOSGPLCOPYRIGHTBEGIN####
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// -------------------------------------------
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// This file is part of eCos, the Embedded Configurable Operating System.
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// Copyright (C) 1998, 1999, 2000, 2001, 2002 Red Hat, Inc.
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//
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// eCos is free software; you can redistribute it and/or modify it under
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// the terms of the GNU General Public License as published by the Free
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// Software Foundation; either version 2 or (at your option) any later version.
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//
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// eCos is distributed in the hope that it will be useful, but WITHOUT ANY
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// WARRANTY; without even the implied warranty of MERCHANTABILITY or
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// FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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// for more details.
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//
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// You should have received a copy of the GNU General Public License along
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// with eCos; if not, write to the Free Software Foundation, Inc.,
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// 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA.
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//
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// As a special exception, if other files instantiate templates or use macros
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// or inline functions from this file, or you compile this file and link it
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// with other works to produce a work based on this file, this file does not
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// by itself cause the resulting work to be covered by the GNU General Public
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// License. However the source code for this file must still be made available
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// in accordance with section (3) of the GNU General Public License.
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//
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// This exception does not invalidate any other reasons why a work based on
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// this file might be covered by the GNU General Public License.
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//
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// Alternative licenses for eCos may be arranged by contacting Red Hat, Inc.
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// at http://sources.redhat.com/ecos/ecos-license/
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// -------------------------------------------
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//####ECOSGPLCOPYRIGHTEND####
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//==========================================================================
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//#####DESCRIPTIONBEGIN####
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//
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// Author(s): nickg
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// Contributors: nickg
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// Date: 2000-11-15
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// Purpose: Define ELF dynamic loader
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// Description: The classes defined here collectively implement the
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// internal API of the ELF dynamic loader.
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// Usage: #include
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//
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//####DESCRIPTIONEND####
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//
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//==========================================================================
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#include
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#ifndef CYG_LOADER_DYNAMIC_LD
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#include // ELF data structures
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#ifdef __cplusplus
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#include
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#include // assertion macros
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#include
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// -------------------------------------------------------------------------
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// Forward definitions
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class Cyg_LoaderStream;
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class Cyg_LoaderMemBlock;
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class Cyg_LoaderMemAlloc;
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class Cyg_LoadObject_Base;
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class Cyg_LoadObject_Proc;
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class Cyg_LoadObject;
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class Cyg_Loader;
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// -------------------------------------------------------------------------
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// Error codes
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#define CYG_LOADERR_NOERROR 0 // No error
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#define CYG_LOADERR_NOT_ELF 1 // Not ELF format file
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#define CYG_LOADERR_INVALID_CLASS 2 // Not expected file class
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#define CYG_LOADERR_INVALID_BYTEORDER 3 // Not expected byte order
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#define CYG_LOADERR_INVALID_VERSION 4 // Not expected ELF version
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#define CYG_LOADERR_INVALID_MACHINE 5 // Not expected machine type
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#define CYG_LOADERR_NO_MEMORY 6 // No memory
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#define CYG_LOADERR_EOF 7 // End of input stream
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#define CYG_LOADERR_SEEK 8 // Cannot seek to stream position
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#define CYG_LOADERR_INVALID_RELOC 9 // Invalid or unexpected relocation
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#define CYG_LOADERR_NO_HASHTABLE 10 // No hash table in ELF file
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#define CYG_LOADERR_NO_SYMTAB 11 // No symbol table in ELF file
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#define CYG_LOADERR_NO_STRTAB 12 // No srting table in ELF file
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#define CYG_LOADERR_NO_SYMBOL 13 // Symbol not found
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// -------------------------------------------------------------------------
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// Value for undefined or otherwise invalid symbol addresses.
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#define CYG_LOADER_NULLSYMADDR 0
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// -------------------------------------------------------------------------
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// Loader Stream base class.
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// This defines the interface to data streams that are ELF dynamic executable
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// files.
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class Cyg_LoaderStream
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{
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public:
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Cyg_LoaderStream(); // Constructor
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virtual ~Cyg_LoaderStream(); // Destructor
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// The following functions are virtual and are supplied by a
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// derived class to access to data stream.
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virtual cyg_code get_byte(CYG_BYTE *val); // Get a byte from the stream
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virtual cyg_code get_data(CYG_BYTE *addr, CYG_ADDRWORD size);
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virtual cyg_code seek(CYG_ADDRWORD pos); // seek to given position
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// The following functions all make use of the virtual functions
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// to access the data stream.
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cyg_code get_word16(CYG_WORD16 *val); // get a 16 bit value
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cyg_code get_word32(CYG_WORD32 *val); // get a 32 bit value
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cyg_code get_word64(CYG_WORD64 *val); // get a 64 bit value
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};
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// -------------------------------------------------------------------------
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// Memory allocation object. All memory allocated by the Loader is described
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// by one of these.
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struct Cyg_LoaderMemBlock
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: public Cyg_DNode_T
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{
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void *address; // data address
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cyg_int32 size; // block size
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cyg_int32 alignment; // block alignment
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Cyg_LoaderMemAlloc *mem; // allocator used
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CYG_ADDRESS actual_address; // allocator specific actual address for block
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CYG_WORD32 actual_size; // allocator specific actual size for block
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// Convenience free() function
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void free();
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};
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// -------------------------------------------------------------------------
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// Memory allocator base class
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// This defines the interface to a memory allocator used by the loader.
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class Cyg_LoaderMemAlloc
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{
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public:
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Cyg_LoaderMemAlloc();
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virtual ~Cyg_LoaderMemAlloc();
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// The following functions are virtual so that alternative memory
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// allocators may be implemented. The default behaviour of this
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// class is to use malloc/realloc/free to support these functions.
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// Allocate memory of the supplied size and alignment.
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// size - size in bytes
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// alignment - alignment expressed as a power of 2
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// defaults to 8 byte alignment
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virtual Cyg_LoaderMemBlock *alloc( cyg_int32 size,
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cyg_int32 alignment = 8);
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// Reallocate block
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// block - block to reallocate
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// size - new size in bytes
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// alignment - new alignment, -1 if old alignment is to be used.
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virtual Cyg_LoaderMemBlock *realloc( Cyg_LoaderMemBlock *block,
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cyg_int32 size,
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cyg_int32 alignment = -1);
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// Free a previously allocated memory segment.
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virtual void free( Cyg_LoaderMemBlock *block );
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};
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// -------------------------------------------------------------------------
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// Cyg_LoaderMemBlock convenience free() function implementation.
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inline void Cyg_LoaderMemBlock::free() { mem->free(this); };
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// -------------------------------------------------------------------------
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// A loaded object
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class Cyg_LoadObject_Base
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: public Cyg_DNode_T
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{
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friend class Cyg_Loader;
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protected:
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// The following fields come from the constructor arguments
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cyg_uint32 mode; // mode flags
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Cyg_LoaderMemAlloc *memalloc; // Memory allocator
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// The following fields are derived from the ELF header
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Elf32_Word e_type; // File type
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Elf32_Addr e_entry; // Executable entry point
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// The following fields are derived from the PT_DYNAMIC segment in
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// the program header. These fields are named after the DT_ tags
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// that their values are derived from.
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Elf32_Word flags; // flags from DT_FLAGS
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Elf32_Word soname; // name of module, if defined
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Elf_Hash *hash; // address of hash table
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Elf32_Word *bucket; // derived bucket array address
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Elf32_Word *chain; // derived chain array address
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// String table
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unsigned char *strtab; // address of table
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Elf32_Word strsize; // size of table in bytes
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// Symbol table
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Elf32_Sym *symtab; // address of table
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Elf32_Word syment; // size of entry
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// PTL and GOT
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Elf32_Addr pltgot; // address of PLT and/or GOT
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// PLT relocation entries
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Elf32_Addr jmprel; // address of relocation table
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Elf32_Word pltrelsz; // size of jmprel table in bytes
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Elf32_Word pltrel; // type of table entries: DT_REL
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// or DT_RELA
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// Relocation table with implicit addends
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Elf32_Rel *rel; // table address
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Elf32_Word relsize; // table size in bytes
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Elf32_Word relent; // size of entry
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// Relocation table with explicit addends
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Elf32_Rela *rela; // table address
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Elf32_Word relasize; // table size in bytes
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Elf32_Word relaent; // size of entry
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// Init and Fini support
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Elf32_Addr init; // address of init function
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Elf32_Addr fini; // address of fini function
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Elf32_Addr *init_array; // address of init array
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Elf32_Word init_array_sz; // size of init array
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Elf32_Addr *fini_array; // address of fini array
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Elf32_Word fini_array_sz; // size of fini array
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Elf32_Addr *pre_init_array; // address of pre_init array
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Elf32_Word pre_init_array_sz; // size of pre_init array
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Elf32_Dyn *dynamic; // address of _DYNAMIC section
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CYG_ADDRESS base; // base address used in address and
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// relocation calcualtions
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Cyg_CList_T segs; // chain of loaded segments
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cyg_code error; // most recent error code
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// private functions
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void parse_dynamic( Elf32_Dyn *dynamic );
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// Translate a symbol from its symbol table index into its
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// actual address
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CYG_ADDRESS get_sym_addr_from_ix( Elf32_Word sym );
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// Get a symbol from this object's symbol table.
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Elf32_Sym *get_sym( Elf32_Word ix );
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// Get a name from this object's string table.
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char *get_name( Elf32_Word offset );
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// Look up the name in the hash table and return its symbol
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// table entry, or NULL if not found.
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Elf32_Sym *hash_lookup( const char *name );
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// Look up the name in the hash table and return its absolute
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// address or CYG_LOADER_NULLSYMADDR if it is not found.
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CYG_ADDRESS hash_lookup_addr( const char *name );
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// Standard ELF-defined hash function for symbol table.
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static unsigned long elf_hash( const unsigned char *name );
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public:
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// Constructor - reads and allocates the executable.
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Cyg_LoadObject_Base();
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Cyg_LoadObject_Base( Cyg_LoaderStream& stream,
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cyg_uint32 mode,
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Cyg_LoaderMemAlloc *mem );
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~Cyg_LoadObject_Base(); // Destructor
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inline cyg_code get_error() { return error; };
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// Translate a symbol into its address.
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void *symbol( const char *name );
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// Start this executable running
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cyg_code exec(int argc, char **argv, char **envv);
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};
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#endif // __cplusplus
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#endif // CYG_LOADER_DYNAMIC_LD
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// -------------------------------------------------------------------------
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// All the following files should have suitable ifdefs so that only
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// one actually provides content.
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#include // MIPS ELF support
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#include // ARM ELF support
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#include // i386 ELF support
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#include // PowerPC ELF support
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//#include // Sparc ELF support
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//#include // SH ELF support
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// -------------------------------------------------------------------------
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#ifndef CYG_LOADER_DYNAMIC_LD
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#ifdef __cplusplus
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class Cyg_LoadObject :
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public Cyg_LoadObject_Proc
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{
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Cyg_LoaderMemBlock *block;
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public:
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inline Cyg_LoadObject()
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: Cyg_LoadObject_Proc()
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{
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};
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inline Cyg_LoadObject( Cyg_LoaderStream& stream,
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cyg_uint32 mode,
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Cyg_LoaderMemAlloc *mem,
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Cyg_LoaderMemBlock *ablock = NULL)
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: Cyg_LoadObject_Proc( stream, mode, mem )
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{
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block = ablock;
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};
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inline ~Cyg_LoadObject() {};
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Cyg_LoaderMemBlock *get_block() { return block; };
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// Apply dynamic relocations to the executable
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void relocate();
|
377 |
|
|
|
378 |
|
|
// Apply PLT relocations
|
379 |
|
|
void relocate_plt();
|
380 |
|
|
};
|
381 |
|
|
|
382 |
|
|
// -------------------------------------------------------------------------
|
383 |
|
|
// Main loader class
|
384 |
|
|
|
385 |
|
|
class Cyg_Loader
|
386 |
|
|
{
|
387 |
|
|
// current error code.
|
388 |
|
|
cyg_code error;
|
389 |
|
|
|
390 |
|
|
// Default memory allocator.
|
391 |
|
|
Cyg_LoaderMemAlloc *mem_default;
|
392 |
|
|
|
393 |
|
|
// Load object for main program
|
394 |
|
|
Cyg_LoadObject *main;
|
395 |
|
|
|
396 |
|
|
// List of loaded executables, including the main
|
397 |
|
|
// program and all libraries.
|
398 |
|
|
Cyg_CList_T loadlist;
|
399 |
|
|
|
400 |
|
|
public:
|
401 |
|
|
|
402 |
|
|
Cyg_Loader( Cyg_LoaderMemAlloc *mem); // Constructor
|
403 |
|
|
|
404 |
|
|
~Cyg_Loader(); // Destructor
|
405 |
|
|
|
406 |
|
|
|
407 |
|
|
// Load an object and all its dependencies.
|
408 |
|
|
cyg_code load( Cyg_LoaderStream& stream,
|
409 |
|
|
cyg_uint32 mode,
|
410 |
|
|
Cyg_LoadObject **object);
|
411 |
|
|
|
412 |
|
|
// Close an object and remove it from memory
|
413 |
|
|
cyg_code close( Cyg_LoadObject *object );
|
414 |
|
|
|
415 |
|
|
// Translate current error code into a string.
|
416 |
|
|
const char *error_string( );
|
417 |
|
|
|
418 |
|
|
// Look up a symbol
|
419 |
|
|
Elf32_Sym *hash_lookup( const char *name );
|
420 |
|
|
|
421 |
|
|
// look up a named symbol in loadlist and return its
|
422 |
|
|
// address relocated to its load address.
|
423 |
|
|
CYG_ADDRESS hash_lookup_addr( const char *name );
|
424 |
|
|
|
425 |
|
|
// Static pointer to loader object
|
426 |
|
|
static Cyg_Loader *loader;
|
427 |
|
|
};
|
428 |
|
|
|
429 |
|
|
//==========================================================================
|
430 |
|
|
// Memory based loader stream
|
431 |
|
|
|
432 |
|
|
class Cyg_LoaderStream_Mem
|
433 |
|
|
: public Cyg_LoaderStream
|
434 |
|
|
{
|
435 |
|
|
CYG_ADDRESS base;
|
436 |
|
|
CYG_ADDRESS pos;
|
437 |
|
|
CYG_ADDRESS end;
|
438 |
|
|
|
439 |
|
|
public:
|
440 |
|
|
|
441 |
|
|
Cyg_LoaderStream_Mem( const void *addr, cyg_int32 size );
|
442 |
|
|
|
443 |
|
|
~Cyg_LoaderStream_Mem(); // Destructor
|
444 |
|
|
|
445 |
|
|
cyg_code get_byte(CYG_BYTE *val); // Get a byte from the stream
|
446 |
|
|
|
447 |
|
|
cyg_code get_data(CYG_BYTE *addr, CYG_ADDRWORD size);
|
448 |
|
|
|
449 |
|
|
cyg_code seek(CYG_ADDRWORD pos); // seek to given position
|
450 |
|
|
|
451 |
|
|
};
|
452 |
|
|
|
453 |
|
|
//==========================================================================
|
454 |
|
|
// Fileio based loader stream
|
455 |
|
|
|
456 |
|
|
#ifdef CYGPKG_IO_FILEIO
|
457 |
|
|
|
458 |
|
|
class Cyg_LoaderStream_File
|
459 |
|
|
: public Cyg_LoaderStream
|
460 |
|
|
{
|
461 |
|
|
int fd;
|
462 |
|
|
|
463 |
|
|
public:
|
464 |
|
|
|
465 |
|
|
Cyg_LoaderStream_File( int afd );
|
466 |
|
|
|
467 |
|
|
~Cyg_LoaderStream_File(); // Destructor
|
468 |
|
|
|
469 |
|
|
cyg_code get_byte(CYG_BYTE *val); // Get a byte from the stream
|
470 |
|
|
|
471 |
|
|
cyg_code get_data(CYG_BYTE *addr, CYG_ADDRWORD size);
|
472 |
|
|
|
473 |
|
|
cyg_code seek(CYG_ADDRWORD pos); // seek to given position
|
474 |
|
|
|
475 |
|
|
};
|
476 |
|
|
|
477 |
|
|
#endif
|
478 |
|
|
|
479 |
|
|
// -------------------------------------------------------------------------
|
480 |
|
|
|
481 |
|
|
#endif // __cplusplus
|
482 |
|
|
|
483 |
|
|
#endif // CYG_LOADER_DYNAMIC_LD
|
484 |
|
|
|
485 |
|
|
// -------------------------------------------------------------------------
|
486 |
|
|
#endif // ifndef CYGONCE_LOADER_LOADER_HXX
|
487 |
|
|
// EOF loader.hxx
|