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csantifort |
/*----------------------------------------------------------------
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// //
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// elfsplitter.c //
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// //
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// This file is part of the Amber project //
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// http://www.opencores.org/project,amber //
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// //
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// Description //
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// Used by the boot loader to split an elf file and copy it //
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// to the correct memory locations ready for execution. //
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// //
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// Author(s): //
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// - Conor Santifort, csantifort.amber@gmail.com //
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// //
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//////////////////////////////////////////////////////////////////
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// //
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// Copyright (C) 2010 Authors and OPENCORES.ORG //
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// //
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// This source file may be used and distributed without //
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// restriction provided that this copyright statement is not //
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// removed from the file and that any derivative work contains //
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// the original copyright notice and the associated disclaimer. //
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// //
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// This source file is free software; you can redistribute it //
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// and/or modify it under the terms of the GNU Lesser General //
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// Public License as published by the Free Software Foundation; //
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// either version 2.1 of the License, or (at your option) any //
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// later version. //
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// //
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// This source is distributed in the hope that it will be //
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// useful, but WITHOUT ANY WARRANTY; without even the implied //
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// warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR //
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// PURPOSE. See the GNU Lesser General Public License for more //
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// details. //
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// //
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// You should have received a copy of the GNU Lesser General //
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// Public License along with this source; if not, download it //
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// from http://www.opencores.org/lgpl.shtml //
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// //
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----------------------------------------------------------------*/
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#define MEM_BUF_ENTRIES 32
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/*
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ELF File Structure
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A single segment usually consist of several sections. E.g., a loadable
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read-only segment could contain sections for executable code, read-only
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data, and symbols for the dynamic linker. Relocatable files have section
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header tables. Executable files have program header tables. Shared object
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files have both. Sections are intended for further processing by a linker,
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while the segments are intended to be mapped into memory.
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*/
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#define EI_NIDENT 16
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#define SHT_PROGBITS 1
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#define SHT_NOBITS 8
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/* Main ELF Header Table */
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typedef struct {
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unsigned char e_ident[EI_NIDENT]; /* bytes 0 to 15 */
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unsigned short e_e_type; /* bytes 15 to 16 */
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unsigned short e_machine; /* bytes 17 to 18 */
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unsigned int e_version; /* bytes 19 to 22 */
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unsigned int e_entry; /* bytes 23 to 26 */
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unsigned int e_phoff; /* bytes 27 to 30 */
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unsigned int e_shoff; /* bytes 31 to 34 */
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unsigned int e_flags; /* bytes 35 to 38 */
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unsigned short e_ehsize; /* bytes 39 to 40 */
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unsigned short e_phentsize; /* bytes 41 to 42 */
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unsigned short e_phnum; /* bytes 43 to 44 (2B to 2C) */
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unsigned short e_shentsize; /* bytes 45 to 46 */
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unsigned short e_shnum; /* bytes 47 to 48 */
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unsigned short e_shstrndx; /* bytes 49 to 50 */
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} ElfHeader;
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/* Section Headers */
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typedef struct {
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unsigned int sh_name; /* section name - index into string table */
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unsigned int sh_type; /* SHT_... */
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unsigned int sh_flags; /* SHF_... */
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unsigned int sh_addr; /* virtual address */
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unsigned int sh_offset; /* file offset */
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unsigned int sh_size; /* section size */
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unsigned int sh_link; /* misc info */
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unsigned int sh_info; /* misc info */
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unsigned int sh_addralign; /* memory alignment */
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unsigned int sh_entsize; /* entry size if table */
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} Elf32_Shdr;
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/* Buffer to hold interrupt vector memory values
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Can't copy these into mem0 locations until ready to pass control
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t new program
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*/
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typedef struct {
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char data;
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int valid;
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} mem_entry_t;
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typedef struct {
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mem_entry_t entry [MEM_BUF_ENTRIES];
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} mem_buf_t;
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/* global vectors */
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mem_buf_t* elf_mem0_g;
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/* function prototypes */
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int elfsplitter (char*, socket_t*);
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