add records and macros to interpret an ELF binary

arch/x86/include/asm/elf.h

@@ -0,0 +1,179 @@
+/*
+ * Copyright (c) 2010, Stefan Lankes, RWTH Aachen University
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are met:
+ *    * Redistributions of source code must retain the above copyright
+ *      notice, this list of conditions and the following disclaimer.
+ *    * Redistributions in binary form must reproduce the above copyright
+ *      notice, this list of conditions and the following disclaimer in the
+ *      documentation and/or other materials provided with the distribution.
+ *    * Neither the name of the University nor the names of its contributors
+ *      may be used to endorse or promote products derived from this
+ *      software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND
+ * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
+ * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
+ * DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE FOR ANY
+ * DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
+ * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
+ * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
+ * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
+ * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+/**
+ * @author Stefan Lankes
+ * @file arch/x86/include/asm/elf.h
+ * @brief Define constants and structures related to ELF
+ *
+ * This file keeps define constants for identification and definition of ELF files.\n
+ * ELF files consist of up to five parts:
+ * - ELF header
+ * - program header table
+ * - section header table
+ * - ELF sections
+ * - ELF segment
+ */
+#ifndef __ELF_H__
+#define __ELF_H__
+
+#include <eduos/config.h>
+#include <asm/stddef.h>
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+#define ELF_MAGIC 0x464C457F
+
+#define ELF_ET_NONE	0x0000	// no type
+#define ELF_ET_REL	0x0001	// relocatable
+#define ELF_ET_EXEC	0x0002	// executeable
+#define ELF_ET_DYN	0x0003	// Shared-Object-File
+#define ELF_ET_CORE	0x0004	// Corefile
+#define ELF_ET_LOPROC	0xFF00	// Processor-specific
+#define ELF_ET_HIPROC	0x00FF	// Processor-specific
+ 
+#define ELF_EM_NONE	0x0000	// no type
+#define ELF_EM_M32	0x0001	// AT&T WE 32100
+#define ELF_EM_SPARC	0x0002	// SPARC
+#define ELF_EM_386	0x0003	// Intel 80386
+#define ELF_EM_68K	0x0004	// Motorola 68000
+#define ELF_EM_88K	0x0005	// Motorola 88000
+#define ELF_EM_860	0x0007	// Intel 80860
+#define ELF_EM_MIPS	0x0008	// MIPS RS3000
+
+#define ELF_CLASS_NONE	0x0000
+#define ELF_CLASS_32	0x0001	// 32bit file
+#define ELF_CLASS_64	0x0002	// 64bit file
+ 
+#define ELF_DATA_NONE	0x0000
+#define ELF_DATA_2LSB	0x0001
+#define ELF_DATA_2MSB	0x002
+ 
+/* Legal values for p_type (segment type).  */
+
+#define ELF_PT_NULL		0	/* Program header table entry unused */
+#define ELF_PT_LOAD		1	/* Loadable program segment */
+#define ELF_PT_DYNAMIC		2	/* Dynamic linking information */
+#define ELF_PT_INTERP		3	/* Program interpreter */
+#define ELF_PT_NOTE		4	/* Auxiliary information */
+#define ELF_PT_SHLIB		5
+#define ELF_PT_PHDR		6	/* Entry for header table itself */
+#define ELF_PT_TLS		7	/* Thread-local storage segment */
+#define ELF_PT_NUM		8	/* Number of defined types */
+#define ELF_PT_LOOS		0x60000000	/* Start of OS-specific */
+#define ELF_PT_GNU_EH_FRAME	0x6474e550	/* GCC .eh_frame_hdr segment */
+#define ELF_PT_GNU_STACK	0x6474e551	/* Indicates stack executability */
+#define ELF_PT_GNU_RELRO	0x6474e552	/* Read-only after relocation */
+#define ELF_PT_LOSUNW		0x6ffffffa
+#define ELF_PT_SUNWBSS		0x6ffffffa	/* Sun Specific segment */
+#define ELF_PT_SUNWSTACK	0x6ffffffb	/* Stack segment */
+#define ELF_PT_HISUNW		0x6fffffff
+#define ELF_PT_HIOS		0x6fffffff	/* End of OS-specific */
+#define ELF_PT_LOPROC		0x70000000	/* Start of processor-specific */
+#define ELF_PT_HIPROC		0x7fffffff	/* End of processor-specific */
+
+/* These constants define the permissions on sections in the program
+   header, p_flags. */
+#define PF_R			0x4
+#define PF_W			0x2
+#define PF_X			0x1
+
+/** @brief Identification part of an ELF-file's header
+ *
+ * This structure keeps information about the file format
+ */
+typedef struct {
+	uint32_t magic;
+	uint8_t _class;
+	uint8_t data;
+	uint8_t version;
+	uint8_t pad[8];
+	uint8_t nident;
+} __attribute__ ((packed)) elf_ident_t;
+
+/** @brief Information about the executable
+ *
+ * ELF header\n
+ * This structure keeps information about the format of the executable itself.
+ */
+typedef struct {
+	elf_ident_t ident;
+	uint16_t type;
+	uint16_t machine;
+	uint32_t version;
+	uint32_t entry;
+	uint32_t ph_offset;
+	uint32_t sh_offset;
+	uint32_t flags;
+	uint16_t header_size;
+	uint16_t ph_entry_size;
+	uint16_t ph_entry_count;
+	uint16_t sh_entry_size;
+	uint16_t sh_entry_count;
+	uint16_t sh_str_table_index;
+} __attribute__ ((packed)) elf_header_t;
+
+/** @brief program header information
+ *
+ * program header table\n
+ * This structure keeps information about the program header.
+ */
+typedef struct {
+	uint32_t type;
+	uint32_t offset;
+	uint32_t virt_addr;
+	uint32_t phys_addr;
+	uint32_t file_size;
+	uint32_t mem_size;
+	uint32_t flags;
+	uint32_t alignment;
+} __attribute__ ((packed)) elf_program_header_t;
+
+/** @brief Information about ELF section
+ *
+ * ELF section\n
+ * This structure keeps information about a specific ELF section
+ */
+typedef struct {
+uint32_t name;
+	uint32_t type;
+	uint32_t flags;
+	uint32_t addr;
+	uint32_t offset;
+	uint32_t size;
+	uint32_t link;
+	uint32_t info;
+	uint32_t align;
+	uint32_t enttry_size;
+} __attribute__ ((packed)) elf_section_header_t;
+
+#ifdef __cplusplus
+}
+#endif
+#endif