diff -r 000000000000 -r 83f4b4db085c toolsandutils/e32tools/elftools/inc/elfdefs.h --- /dev/null Thu Jan 01 00:00:00 1970 +0000 +++ b/toolsandutils/e32tools/elftools/inc/elfdefs.h Tue Feb 02 01:39:43 2010 +0200 @@ -0,0 +1,817 @@ +// Copyright (c) 2001-2009 Nokia Corporation and/or its subsidiary(-ies). +// All rights reserved. +// This component and the accompanying materials are made available +// under the terms of "Eclipse Public License v1.0" +// which accompanies this distribution, and is available +// at the URL "http://www.eclipse.org/legal/epl-v10.html". +// +// Initial Contributors: +// Nokia Corporation - initial contribution. +// +// Contributors: +// +// Description: +// lifted from the ARMELF spec +// +// + +#ifndef __ELFDEFS_H__ +#define __ELFDEFS_H__ + + +// ARMELF 3.1.2 +// Data Representation +typedef unsigned int Elf32_Addr; //Unsigned program address +typedef unsigned short Elf32_Half; //Unsigned medium integer +typedef unsigned int Elf32_Off; //Unsigned file offset +typedef signed int Elf32_Sword; //Signed large integer +typedef unsigned int Elf32_Word; //Unsigned large integer +typedef unsigned char UChar; //Unsigned small integer + +typedef char* MemAddr; +/* +3.2 ELF Header +Some object file control structures can grow, because the ELF header +contains their actual sizes. If the object file format changes, a +program may encounter control structures that are larger or smaller +than expected. Programs might therefore ignore extra information. The +treatment of missing information depends on context and will be +specified when and if extensions are defined. +*/ +#define EI_NIDENT 16 +typedef struct { + + // marks the file as an object file and provide machine-independent + // data with which to decode and interpret the file's contents. + unsigned char e_ident[EI_NIDENT]; + + // identifies the object file type. + Elf32_Half e_type; + + // specifies the required architecture for an individual file. + Elf32_Half e_machine; + + // identifies the object file version. + Elf32_Word e_version; + + // gives the virtual address to which the system first transfers + // control, thus starting the process. If the file has no associated + // entry point, this member holds zero. + Elf32_Addr e_entry; + + // holds the program header table's file offset in bytes. If the + // file has no program header table, this member holds zero. + Elf32_Off e_phoff; + + // holds the section header table's file offset in bytes. If the + // file has no section header table, this member holds zero. + Elf32_Off e_shoff; + + // holds processor-specific flags associated with the file. Flag + // names take the form EF_machine_flag. + Elf32_Word e_flags; + + // holds the ELF header's size in bytes. + Elf32_Half e_ehsize; + + // holds the size in bytes of one entry in the file's program + // header table; all entries are the same size. + Elf32_Half e_phentsize; + + // holds the number of entries in the program header table. + // Thus the product of e_phentsize and e_phnum gives the table's + // size in bytes. If a file has no program header table, e_phnum + // holds the value zero. + Elf32_Half e_phnum; + + // holds a section header's size in bytes. A section header is + // one entry in the section header table; all entries are the same size. + Elf32_Half e_shentsize; + + // holds the number of entries in the section header table. Thus + // the product of e_shentsize and e_shnum gives the section header + // table's size in bytes. If a file has no section header table, + // e_shnum holds the value zero. + Elf32_Half e_shnum; + + // holds the section header table index of the entry associated + // with the section name string table. If the file has no section + // name string table, this member holds the value SHN_UNDEF. + Elf32_Half e_shstrndx; + +} Elf32_Ehdr; + +// values for e_type +#define ET_NONE 0 // No file type +#define ET_REL 1 // Re-locatable +#define ET_EXEC 2 // Executable file +#define ET_DYN 3 // Shared object +#define ET_CORE 4 // Core file +#define ET_LOPROC 0xff00 // Processor-specific +#define ET_HIPROC 0xffff // Processor-specific + +//values for e_machine +#define EM_NONE 0 // No machine +#define EM_M32 1 // AT&T WE 32100 +#define EM_SPARC 2 // SPARC +#define EM_386 3 // Intel Architecture +#define EM_68K 4 // Moto 68000 +#define EM_88K 5 // Moto 88000 +#define EM_860 7 // Intel 80860 +#define EM_MIPS 8 // MIPS RS3000 Big-Endian +#define EM_MIPS_RS4_BE 10 // MIPS RS4000 Big-Endian +//#define RESERVED 11-16 Reserved for future use +#define EM_ARM 40 //ARM/Thumb Architecture + +// values for e_version +#define EV_NONE 0 // Invalid version +#define EV_CURRENT 1 // Current version + +// ELF Identification +#define EI_MAG0 0 // File identification +#define EI_MAG1 1 // File identification +#define EI_MAG2 2 // File identification +#define EI_MAG3 3 // File identification +#define EI_CLASS 4 // File class +#define EI_DATA 5 // Data encoding +#define EI_VERSION 6 // File version +#define EI_PAD 7 // Start of padding bytes + +// values for e_ident[0-3] +#define ELFMAG0 0x7f // e_ident[EI_MAG0] +#define ELFMAG1 'E' // e_ident[EI_MAG1] +#define ELFMAG2 'L' // e_ident[EI_MAG2] +#define ELFMAG3 'F' // e_ident[EI_MAG3] + +// values for e_ident[EI_CLASS]- identifies the file's class, or capacity. +#define ELFCLASSNONE 0 // Invalid class +#define ELFCLASS32 1 // 32-bit objects +#define ELFCLASS64 2 // 64-bit objects + +// values for e_ident[EI_DATA] - specifies the data encoding of the +// processor-specific data in the object file. +#define ELFDATANONE 0 // Invalid data encoding +#define ELFDATA2LSB 1 // 2's complement , with LSB at lowest address. +#define ELFDATA2MSB 2 // 2's complement , with MSB at lowest address. + +// ARM/THUMB specific values for e_flags + +// e_entry contains a program-loader entry point +#define EF_ARM_HASENTRY 0x02 +// Each subsection of the symbol table is sorted by symbol value +#define EF_ARM_SYMSARESORTED 0x04 +// Symbols in dynamic symbol tables that are defined in sections +// included in program segment n have st_shndx = n+ 1. +#define EF_ARM_DYNSYMSUSESEGIDX 0x8 +// Mapping symbols precede other local symbols in the symbol table +#define EF_ARM_MAPSYMSFIRST 0x10 +// This masks an 8-bit version number, the version of the ARM EABI to +// which this ELF file conforms. This EABI is version 2. A value of 0 +// denotes unknown conformance. (current version is 0x02000000) +#define EF_ARM_EABIMASK 0xFF000000 + +#define EF_ARM_EABI_VERSION 0x02000000 +#define EF_ARM_BPABI_VERSION 0x04000000 + +/* +3.3 Sections + +An object file's section header table lets one locate all the file's +sections. The section header table is an array of Elf32_Shdr +structures as described below. A section header table index is a +subscript into this array. The ELF header's e_shoff member gives the +byte offset from the beginning of the file to the section header +table; e_shnum tells how many entries the section header table +contains; e_shentsize gives the size in bytes of each entry. +*/ + +// Some section header table indexes are reserved; an object file will +// not have sections for these special indexes. + +// marks an undefined, missing, irrelevant, or otherwise meaningless +// section reference. +#define SHN_UNDEF 0 +// specifies the lower bound of the range of reserved indexes. +#define SHN_LORESERVE 0xff00 +// SHN_LOPROC-SHN_HIPRO - this inclusive range reserved for +// processor-specific semantics. +#define SHN_LOPROC 0xff00 +#define SHN_HIPROC 0xff1f +// Specifies absolute values for the corresponding reference. +// For example, symbols defined relative to section number SHN_ABS have +// absolute values and are not affected by relocation. +#define SHN_ABS 0xfff1 +// Symbols defined relative to this section are common symbols, +// such as FORTRAN COMMON or unallocated C external variables. +#define SHN_COMMON 0xfff2 +// specifies the upper bound of the range of reserved indexes. +#define SHN_HIRESERVE 0xffff + +typedef struct { + + // specifies the name of the section. Its value is an index into the + // section header string table section [see String Tablebelow], + // giving the location of a null-terminated string. + Elf32_Word sh_name; + + // categorizes the section's contents and semantics. Section types + // and their descriptions appear below. + Elf32_Word sh_type; + + // Sections support 1-bit flags that describe miscellaneous + // attributes. Flag definitions appear below. + Elf32_Word sh_flags; + + // If the section will appear in the memory image of a process, this + // member gives the address at which the section's first byte should + // reside. Otherwise, the member contains 0. + Elf32_Addr sh_addr; + + // gives the byte offset from the beginning of the file to the first + // byte in the section.One section type, SHT_NOBITS described below, + // occupies no space in the file, and its sh_offset member locates + // the conceptual placement in the file. + Elf32_Off sh_offset; + + // gives the section's size in bytes. Unless the section type is + // SHT_NOBITS, the section occupies sh_size bytes in the file. A + // section of type SHT_NOBITS may have a non-zero size, but it + // occupies no space in the file. + Elf32_Word sh_size; + + // holds a section header table index link, whose interpretation + // depends on the section type. A table below describes the values. + Elf32_Word sh_link; + + // holds extra information, whose interpretation depends on the + // section type. A table below describes the values. + Elf32_Word sh_info; + + // Some sections have address alignment constraints. For example, if + // a section holds a doubleword, the system must ensure double-word + // alignment for the entire section. That is, the value of sh_addr + // must be congruent to 0, modulo the value of + // sh_addralign. Currently, only 0 and positive integral powers of + // two are allowed. Values 0 and 1 mean the section has no alignment + // constraints. + Elf32_Word sh_addralign; + + // Some sections hold a table of fixed-size entries, such as a + // symbol table. For such a section, this member gives the size in + // bytes of each entry. The member contains 0 if the section does + // not hold a table of fixedsize entries. A section header's sh_type + // member specifies the section's semantics. + Elf32_Word sh_entsize; + +} Elf32_Shdr; + +// values for sh_type + +#define SHT_NULL 0 // marks the section header as inactive; it does + // not have an associated section. Other members of the section + // header have undefined values. +#define SHT_PROGBITS 1 // The section holds information defined by the + // program, whose format and meaning are determined solely by the + // program. +#define SHT_SYMTAB 2 //These sections hold a symbol table. +#define SHT_STRTAB 3 // The section holds a string table. +#define SHT_RELA 4 // The section holds relocation entries with + // explicit addends, such as type Elf32_Rela for the 32-bit class of + // object files. An object file may have multiple relocation + // sections. See Relocationbelow for details. +#define SHT_HASH 5 // The section holds a symbol hash table. +#define SHT_DYNAMIC 6 // The section holds information for dynamic + // linking. +#define SHT_NOTE 7 // This section holds information that marks the + // file in some way. +#define SHT_NOBITS 8 // A section of this type occupies no space in + // the file but otherwise resembles SHT_PROGBITS. Although this + // section contains no bytes, the sh_offset member contains the + // conceptual file offset. +#define SHT_REL 9 // The section holds relocation entries without + // explicit addends, such as type Elf32_Rel for the 32-bit class of + // object files. An object file may have multiple relocation + // sections. See Relocationbelow for details. +#define SHT_SHLIB 10 // This section type is reserved but has + // unspecified semantics. +#define SHT_DYNSYM 11 // This section hold dynamic symbol information +// SHT_LOPROC through SHT_HIPROC - Values in this inclusive range are +// reserved for processor-specific semantics. +#define SHT_LOPROC 0x70000000 +#define SHT_ARM_EXIDX 0x70000001 +#define SHT_HIPROC 0x7fffffff +// Section types between SHT_LOUSER and SHT_HIUSER may be used by the +// application, without conflicting with current or future +// system-defined section types. +#define SHT_LOUSER 0x80000000 // This value specifies the lower bound + // of the range of indexes reserved for application programs. +#define SHT_HIUSER 0xffffffff // This value specifies the upper bound + // of the range of indexes reserved for application programs. + +// values for sh_flags + +// The section contains data that should be writable during process execution +#define SHF_WRITE 0x1 +// The section occupies memory during process execution. Some control +// sections do not reside in the memory image of an object file; this +// attribute is off for those sections +#define SHF_ALLOC 0x2 +// The section contains executable machine instructions. +#define SHF_EXECINSTR 0x4 +// Bits in this mask are reserved for processor-specific semantics. +#define SHF_MASKPROC 0xf0000000 + + +typedef struct { + + // holds an index into the object file's symbol string table, which + // holds the character representations of the symbol names. + Elf32_Word st_name; + + // gives the value of the associated symbol. Depending on the + // context this may be an absolute value, an address, and so on + Elf32_Addr st_value; + + // Many symbols have associated sizes. For example, a data object's + // size is the number of bytes contained in the object. This member + // holds 0 if the symbol has no size or an unknown size. + Elf32_Word st_size; + + // This member specifies the symbol's type and binding + // attributes. The following code shows how to manipulate the + // values. +#define ELF32_ST_BIND(i) ((i)>>4) +#define ELF32_ST_TYPE(i) ((i)&0xf) +#define ELF32_ST_INFO(b,t) (((b)<<4)+((t)&0xf)) + unsigned char st_info; + + // This member currently holds 0 and has no defined meaning. + unsigned char st_other; + + +#define ELF32_ST_VISIBILITY(o) ((o)&0x3) +#define ELF64_ST_VISIBILITY(o) ((o)&0x3) + + // Every symbol table entry is defined in relation to some section; + // this member holds the relevant section header table index. + Elf32_Half st_shndx; + +} Elf32_Sym; + +// Local symbols are not visible outside the object file containing +// their definition. Local symbols of the same name may exist in +// multiple files without interfering with each other. +#define STB_LOCAL 0 +// Global symbols are visible to all object files being combined. One +// file's definition of a global symbol will satisfy another file's +// undefined reference to the same global symbol. +#define STB_GLOBAL 1 +// Weak symbols resemble global symbols, but their definitions have +// lower precedence. Undefined weak symbols (weak references) may have +// processor- or OS-specific semantics +#define STB_WEAK 2 +// STB_LOPROC through STB_HIPROC - values in this inclusive range are +// reserved for processor-specific semantics. +#define STB_LOPROC 13 +#define STB_HIPROC 15 + +// The symbol's type is not specified. +#define STT_NOTYPE 0 +// The symbol is associated with a data object, such as a variable, an +// array, and so on. +#define STT_OBJECT 1 +// The symbol is associated with a function or other executable code. +#define STT_FUNC 2 +// The symbol is associated with a section. Symbol table entries of +// this type exist primarily for relocation and normally have +// STB_LOCAL binding. +#define STT_SECTION 3 +// A file symbol has STB_LOCAL binding, its section index is SHN_A BS, +// and it precedes the other STB_LOCAL symbols for the file, if it is +// present. +#define STT_FILE 4 +// Values in this inclusive range are reserved for processor-specific +// semantics. If a symbol's value refers to a specific location within +// a section, its section index member, st_shndx, holds an index into +// the section header table. As the section moves during relocation, +// the symbol's value changes as well, and references to the symbol +// continue to point to the same location in the program. Some special +// section index values give other semantics. +#define STT_LOPROC 13 +#define STT_HIPROC 15 + +/* +STV_DEFAULT +The visibility of symbols with the STV_DEFAULT attribute is as specified by the symbol's +binding type. That is, global and weak symbols are visible outside of their defining +component, the executable file or shared object. Local symbols are hidden. Global and weak + symbols can also be preempted, that is, they may by interposed by definitions of the same + name in another component. + +STV_PROTECTED +A symbol defined in the current component is protected if it is visible in other components + but cannot be preempted. Any reference to such a symbol from within the defining component + must be resolved to the definition in that component, even if there is a definition in + another component that would interpose by the default rules. A symbol with STB_LOCAL binding + will not have STV_PROTECTED visibility. + +STV_HIDDEN +A symbol defined in the current component is hidden if its name is not visible to other + components. Such a symbol is necessarily protected. This attribute is used to control + the external interface of a component. An object named by such a symbol may still be + referenced from another component if its address is passed outside. + +A hidden symbol contained in a relocatable object is either removed or converted to +STB_LOCAL binding by the link-editor when the relocatable object is included in an + executable file or shared object. + +STV_INTERNAL +This visibility attribute is currently reserved. +*/ +#define STV_DEFAULT 0 +#define STV_INTERNAL 1 +#define STV_HIDDEN 2 +#define STV_PROTECTED 3 + +// Relocation Entries + +typedef struct { + + // r_offset gives the location at which to apply the relocation + // action. For a relocatable file, the value is the byte offset from + // the beginning of the section to the storage unit affected by the + // relocation. For an executable file or a shared object, the value + // is the virtual address of the storage unit affected by the + // relocation. + Elf32_Addr r_offset; + + // r_info gives both the symbol table index with respect to which + // the relocation must be made, and the type of relocation to + // apply. For example, a call instruction's relocation entry would + // hold the symbol table index of the function being called. If the + // index is STN_UNDEF, the undefined symbol index, the relocation + // uses 0 as the symbol value. Relocation types are + // processor-specific; descriptions of their behavior appear in + // section 4.5, Relocation types. When the text in section 4.5 + // refers to a relocation entry's relocation type or symbol table + // index, it means the result of applying ELF32_R_TYPE or + // ELF32_R_SYM, respectively, to the entry's r_info member. + +#define ELF32_R_SYM(i) ((i)>>8) +#define ELF32_R_TYPE(i) ((unsigned char)(i)) +#define ELF32_R_INFO(s,t) (((s)<<8)+(unsigned char)(t)) + + Elf32_Word r_info; +} Elf32_Rel; + +typedef struct { + Elf32_Addr r_offset; + Elf32_Word r_info; + Elf32_Sword r_addend; +} Elf32_Rela; + +// Program Header + +typedef struct { + + // p_type tells what kind of segment this array element describes or + // how to interpret the array element's information. Type values and + // their meanings are given below. + Elf32_Word p_type; + + // p_offset gives the offset from the start of the file at which the + // first byte of the segment resides. + Elf32_Off p_offset; + + // p_vaddr gives the virtual address at which the first byte of the + // segment resides in memory. + Elf32_Addr p_vaddr; + + // p_paddr - On systems for which physical addressing is relevant, + // this member is reserved for the segment's physical address. This + // member requires operating system specific information. + Elf32_Addr p_paddr; + + // p_filesz gives the number of bytes in the file image of the + // segment; it may be zero. + Elf32_Word p_filesz; + + // p_memsz gives the number of bytes in the memory image of the + // segment; it may be zero. + Elf32_Word p_memsz; + + // p_flags gives flags relevant to the segment. Defined flag values + // are given below. + Elf32_Word p_flags; + + // p_align - Loadable process segments must have congruent values + // for p_vaddr and p_offset, modulo the page size. This member gives + // the value to which the segments are aligned in memory and in the + // file. Values 0 and 1 mean that no alignment is + // required. Otherwise, p_align should be a positive, integral power + // of 2, and p_vaddr should equal p_offset, modulo p_align. + Elf32_Word p_align; + +} Elf32_Phdr; + +// Segment types - values for p_type + +// The array element is unused; other members' values are +// undefined. This type lets the program header table have ignored +// entries. +#define PT_NULL 0 +// The array element specifies a loadable segment, described by +// p_filesz and p_memsz (for additional explanation, see +// PT_LOAD below). +#define PT_LOAD 1 +// The array element specifies dynamic linking information. See +// subsection 4.7. +#define PT_DYNAMIC 2 +// The array element specifies the location and size of a +// null-terminated pathname to invoke as an interpreter. +#define PT_INTERP 3 +// The array element specifies the location and size of auxiliary +// information. +#define PT_NOTE 4 +// This segment type is reserved but has unspecified semantics. +#define PT_SHLIB 5 +// The array element, if present, specifies the location and size of +// the program header table itself (for additional explanation, see +// PT_ PHDR below). +#define PT_PHDR 6 +// Values in the inclusive [PT_LOPROC, PT_HIPROC] range are reserved +// for processor-specific semantics. +#define PT_LOPROC 0x70000000 +#define PT_HIPROC 0x7fffffff + +// values for p_flags +// The segment may be executed. +#define PF_X 1 +// The segment may be written to. +#define PF_W 2 +// The segment may be read. +#define PF_R 4 +// Reserved for processor-specific purposes (see 4.6, Program +// headers). +#define PF_MASKPROC 0xf0000000 +#define PF_ARM_ENTRY 0x80000000 + + +// Relocation types + +// ELF defines two sorts of relocation directive, SHT_REL, and +// SHT_RELA. Both identify: +// +// o A section containing the storage unit - byte, half-word, word, or +// instruction - being relocated. +// o An offset within the section - or the address within an +// executable program - of the storage unit itself. +// o A symbol,the value of which helps to define a new value for the +// storage unit. +// o A relocation typethat defines the computation to be +// performed. Computations are performed using 2's complement, 32-bit, +// unsigned arithmetic with silent overflow. +// o An addend, that also helps to define a new value for the storage +// unit. +// +// The addend may be encoded wholly in a field of the storage unit +// being relocated - relocation sort SHT_REL - or partly there and +// partly in the addendfield of the relocation directive - relocation +// sort SHT_RELA. Tables below describe the computation associated +// with each relocation type, using the following notation: +// +// A - denotes the addend used to compute the new value of the storage +// unit being relocated. +// - It is the value extracted from the storage unit being relocated +// (relocation directives of sort SHT_REL) or the sum of that +// value and the r_addend field of the relocation directive (sort +// SHT_RELA). +// - If it has a unit, the unit is bytes. An encoded address or +// offset value is converted to bytes on extraction from a storage +// unit and re-encoded on insertion into a storage unit. +// +// P - denotes the place (section offset or address of the storage +// unit) being re-located. It is the sum of the r_offset field of +// the relocation directive and the base address of the section +// being re-located. +// +// S - denotes the value of the symbol whose symbol table index is +// given in the r_info field of the relocation directive. +// +// B - denotes the base address of the consolidated section in which +// the symbol is defined. For relocations of type R_ARM_SBREL32, +// this is the least static data address (the static base). +// +// relocation types 0-16 are generic +// Name Type Field Computation +//==================================================================== +#define R_ARM_NONE 0 // Any No relocation. +#define R_ARM_PC24 1 // ARM B/BL S - P + A +#define R_ARM_ABS32 2 // 32-bit word S + A +#define R_ARM_REL32 3 // 32-bit word S - P + A +#define R_ARM_PC13 4 // ARM LDR r, [pc,...] S - P + A +#define R_ARM_ABS16 5 // 16-bit half-word S + A +#define R_ARM_ABS12 6 // ARM LDR/STR S + A +#define R_ARM_THM_ABS5 7 // Thumb LDR/STR S + A +#define R_ARM_ABS8 8 // 8-bit byte S + A +#define R_ARM_SBREL32 9 // 32-bit word S - B + A +#define R_ARM_THM_PC22 10 // Thumb BL pair S - P + A +#define R_ARM_THM_PC8 11 // Thumb LDR r, [pc,...] S - P + A +#define R_ARM_AMP_VCALL9 12 // AMP VCALL Obsolete - SA-1500 +#define R_ARM_SWI24 13 // ARM SWI S + A +#define R_ARM_THM_SWI8 14 // Thumb SWI S + A +#define R_ARM_XPC25 15 // ARM BLX S - P + A +#define R_ARM_THM_XPC22 16 // Thumb BLX pair S - P + A + +// relocation types 17-31 are reserved for ARM Linux +#define R_ARM_GLOB_DAT 21 // PLT related S + A +#define R_ARM_JUMP_SLOT 22 // PLT related S + A +#define R_ARM_RELATIVE 23 // 32-bit word B(S) + A + +#define R_ARM_GOT_BREL 26 // + +#define R_ARM_ALU_PCREL_7_0 32 // ARM ADD/SUB (S - P + A) & 0x000000FF +#define R_ARM_ALU_PCREL_15_8 33 // ARM ADD/SUB (S - P + A) & 0x0000FF00 +#define R_ARM_ALU_PCREL_23_15 34 // ARM ADD/SUB (S - P + A) & 0x00FF0000 +#define R_ARM_LDR_SBREL_11_0 35 // ARM ADD/SUB (S - B + A) & 0x00000FFF +#define R_ARM_ALU_SBREL_19_12 36 // ARM ADD/SUB (S - B + A) & 0x000FF000 +#define R_ARM_ALU_SBREL_27_20 37 // ARM ADD/SUB (S - B + A) & 0x0FF00000 + +// Dynamic relocation types + +// A small set of relocation types supports relocating executable ELF +// files. They are used only in a relocation section embedded in a +// dynamic segment (see section 4.7, Dynamic linking and +// relocation). They cannot be used in a relocation section in a +// re-locatable ELF file. In Figure 4-13 below: +// +// .S is the displacement from its statically linked virtual address +// of the segment containing the symbol definition. +// +// .P is the displacement from its statically linked virtual address +// of the segment containing the place to be relocated. +// +// .SB is the displacement of the segment pointed to by the static +// base (PF_ARM_SB is set in the p_flags field of this segment's +// program header - see 4.6, Program headers). + + +// types 249 - 255 are dynamic relocation types and are only used in dynamic sections +#define R_ARM_RXPC25 249 // ARM BLX (.S - .P) + A + // For calls between program segments. +#define R_ARM_RSBREL32 250 // Word (.S - .SB) + A + // For an offset from SB, the static base. +#define R_ARM_THM_RPC22 251 // Thumb BL/BLX pair (.S - .P) + A + // For calls between program segments. +#define R_ARM_RREL32 252 // Word (.S - .P) + A + // For on offset between two segments. +#define R_ARM_RABS32 253 // Word .S + A + // For the address of a location in the target segment. +#define R_ARM_RPC24 254 // ARM B/BL (.S - .P) + A + // For calls between program segments. +#define R_ARM_RBASE 255 // None Identifies the segment being relocated by + // the following relocation directives. +// DYNAMIC SEGMENT +// The dynamic segment begins with a dynamic section containing an array of structures of type: +typedef struct Elf32_Dyn { + Elf32_Sword d_tag; + Elf32_Word d_val; +} Elf32_Dyn; + +// This entry marks the end of the dynamic array. mandatory +#define DT_NULL 0 +// Index in the string table of the name of a needed library. multiple +#define DT_NEEDED 1 +// These entries are unused by versions 1-2 of the ARM EABI. unused +#define DT_PLTRELSZ 2 +#define DT_PLTGOT 3 +// The offset of the hash table section in the dynamic segment. mandatory +#define DT_HASH 4 +// The offset of the string table section in the dynamic segment. mandatory +#define DT_STRTAB 5 +// The offset of the symbol table section in the dynamic segment. mandatory +#define DT_SYMTAB 6 +// The offset in the dynamic segment of an SHT_RELA relocation +// section, Its bytesize,and the byte size of an ARMRELA-type +// relocation entry. optional +#define DT_RELA 7 +#define DT_RELASZ 8 +#define DT_RELAENT 9 +// The byte size of the string table section. mandatory +#define DT_STRSZ 10 +// The byte size of an ARM symbol table entry. mandatory +#define DT_SYMENT 11 +// These entries are unused by versions 1-2 of the ARM EABI. unused +#define DT_INIT 12 +#define DT_FINI 13 +// The Index in the string table of the name of this shared object. mandatory +#define DT_SONAME 14 +// Unused by the ARM EABI. unused +#define DT_RPATH 15 +#define DT_SYMBOLIC 16 +//The offset in the dynamic segment of an SHT_REL relocation section, +//Its bytesize, and the byte size of an ARMREL-type relocation +//entry. optional +#define DT_REL 17 +#define DT_RELSZ 18 +#define DT_RELENT 19 +// These entries are unused by versions 1-2 of the ARM EABI. unused +#define DT_PLTREL 20 +#define DT_DEBUG 21 +#define DT_TEXTREL 22 +#define DT_JMPREL 23 +#define DT_BIND_NOW 24 +#define DT_INIT_ARRAY 25 +#define DT_FINI_ARRAY 26 +#define DT_INIT_ARRAYSZ 27 +#define DT_FINI_ARRAYSZ 28 + +#define DT_VERSYM 0x6ffffff0 /* see section 3.3.3.1 in bpabi*/ +#define DT_RELCOUNT 0x6ffffffa +#define DT_VERDEF 0x6ffffffc /* Address of version definition + table */ +#define DT_VERDEFNUM 0x6ffffffd /* Number of version definitions */ +#define DT_VERNEED 0x6ffffffe /* Address of table with needed + versions */ +#define DT_VERNEEDNUM 0x6fffffff /* Number of needed versions */ + +// Values in this range are reserved to the ARM EABI. unused +#define DT_LOPROC 0x70000000 +#define DT_HIPROC 0x7fffffff +#define DT_ARM_RESERVED1 0x70000000 +/* Number of entries in the dynamic symbol table, including the initial dummy symbol. */ +#define DT_ARM_SYMTABSZ_21 0x70000000 // For RVCT 2.1 +#define DT_ARM_SYMTABSZ 0x70000001 // The DT_ARM_SYMTABSZ tag value has been changed from RVCT2.2 +/* Holds the address of the pre-emption map for platforms that use the DLL static binding model. */ +#define DT_ARM_PREEMPTMAP 0x70000002 +#define DT_ARM_RESERVED2 0x70000003 +#define DT_ARM_PLTGOTBASE 0x70000004 +#define DT_ARM_PLTGOTLIMIT 0x70000005 + +// What the hash table looks like in the dynamic segment +typedef struct Elf32_HashTable { + Elf32_Word nBuckets; + Elf32_Word nChains; + // Elf32_Word bucket[nBuckets]; + // Elf32_Word chain[nChains]; +} Elf32_HashTable; + + +typedef struct +{ + Elf32_Half vd_version; /* Version revision */ + Elf32_Half vd_flags; /* Version information */ + Elf32_Half vd_ndx; /* Version Index */ + Elf32_Half vd_cnt; /* Number of associated aux entries */ + Elf32_Word vd_hash; /* Version name hash value */ + Elf32_Word vd_aux; /* Offset in bytes to verdaux array */ + Elf32_Word vd_next; /* Offset in bytes to next verdef + entry */ +} Elf32_Verdef; + +typedef struct +{ + Elf32_Word vda_name; /* Version or dependency names */ + Elf32_Word vda_next; /* Offset in bytes to next verdaux + entry */ +} Elf32_Verdaux; + + +typedef struct +{ + Elf32_Half vn_version; /* Version of structure */ + Elf32_Half vn_cnt; /* Number of associated aux entries */ + Elf32_Word vn_file; /* Offset of filename for this + dependency */ + Elf32_Word vn_aux; /* Offset in bytes to vernaux array */ + Elf32_Word vn_next; /* Offset in bytes to next verneed + entry */ +} Elf32_Verneed; + +typedef struct { + Elf32_Word vna_hash; + Elf32_Half vna_flags; + Elf32_Half vna_other; + Elf32_Word vna_name; + Elf32_Word vna_next; +} Elf32_Vernaux; + + +enum ESegmentType +{ + ESegmentUndefined = SHN_UNDEF, // undefined or meaningless section/segment reference + ESegmentRO, // Read Only (text) segment + ESegmentRW, // Read Write (data) segment + ESegmentDynamic, // Dynamic segment + ESegmentABS = SHN_ABS, // Symbols defined relative to section number SHN_ABS have + // absolute values and are not affected by relocation. + ESegmentCommon = SHN_COMMON, // Symbols defined relative to section number SHN_ABS have + // absolute values and are not affected by relocation. +}; + +#endif + + + + +