xcoff

package standard library
Version: master (849b791) Latest Latest
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Published: Jul 25, 2021 License: BSD-3-Clause Imports: 7 Imported by: 0

Documentation

Overview

Package xcoff implements access to XCOFF (Extended Common Object File Format) files.

Index

Constants

View Source
const (
	SAIAMAG   = 0x8
	AIAFMAG   = "`\n"
	AIAMAG    = "<aiaff>\n"
	AIAMAGBIG = "<bigaf>\n"

	// Sizeof
	FL_HSZ_BIG = 0x80
	AR_HSZ_BIG = 0x70
)
View Source
const (
	FILHSZ_32 = 20
	FILHSZ_64 = 24
)
View Source
const (
	U802TOCMAGIC = 0737 // AIX 32-bit XCOFF
	U64_TOCMAGIC = 0767 // AIX 64-bit XCOFF
)
View Source
const (
	F_RELFLG    = 0x0001
	F_EXEC      = 0x0002
	F_LNNO      = 0x0004
	F_FDPR_PROF = 0x0010
	F_FDPR_OPTI = 0x0020
	F_DSA       = 0x0040
	F_VARPG     = 0x0100
	F_DYNLOAD   = 0x1000
	F_SHROBJ    = 0x2000
	F_LOADONLY  = 0x4000
)

Flags that describe the type of the object file.

View Source
const (
	STYP_DWARF  = 0x0010
	STYP_TEXT   = 0x0020
	STYP_DATA   = 0x0040
	STYP_BSS    = 0x0080
	STYP_EXCEPT = 0x0100
	STYP_INFO   = 0x0200
	STYP_TDATA  = 0x0400
	STYP_TBSS   = 0x0800
	STYP_LOADER = 0x1000
	STYP_DEBUG  = 0x2000
	STYP_TYPCHK = 0x4000
	STYP_OVRFLO = 0x8000
)

Flags defining the section type.

View Source
const (
	SSUBTYP_DWINFO  = 0x10000 // DWARF info section
	SSUBTYP_DWLINE  = 0x20000 // DWARF line-number section
	SSUBTYP_DWPBNMS = 0x30000 // DWARF public names section
	SSUBTYP_DWPBTYP = 0x40000 // DWARF public types section
	SSUBTYP_DWARNGE = 0x50000 // DWARF aranges section
	SSUBTYP_DWABREV = 0x60000 // DWARF abbreviation section
	SSUBTYP_DWSTR   = 0x70000 // DWARF strings section
	SSUBTYP_DWRNGES = 0x80000 // DWARF ranges section
	SSUBTYP_DWLOC   = 0x90000 // DWARF location lists section
	SSUBTYP_DWFRAME = 0xA0000 // DWARF frames section
	SSUBTYP_DWMAC   = 0xB0000 // DWARF macros section
)
View Source
const (
	// Nscnum
	N_DEBUG = -2
	N_ABS   = -1
	N_UNDEF = 0

	//Ntype
	SYM_V_INTERNAL  = 0x1000
	SYM_V_HIDDEN    = 0x2000
	SYM_V_PROTECTED = 0x3000
	SYM_V_EXPORTED  = 0x4000
	SYM_TYPE_FUNC   = 0x0020 // is function
)
View Source
const (
	C_NULL    = 0   // Symbol table entry marked for deletion
	C_EXT     = 2   // External symbol
	C_STAT    = 3   // Static symbol
	C_BLOCK   = 100 // Beginning or end of inner block
	C_FCN     = 101 // Beginning or end of function
	C_FILE    = 103 // Source file name and compiler information
	C_HIDEXT  = 107 // Unnamed external symbol
	C_BINCL   = 108 // Beginning of include file
	C_EINCL   = 109 // End of include file
	C_WEAKEXT = 111 // Weak external symbol
	C_DWARF   = 112 // DWARF symbol
	C_GSYM    = 128 // Global variable
	C_LSYM    = 129 // Automatic variable allocated on stack
	C_PSYM    = 130 // Argument to subroutine allocated on stack
	C_RSYM    = 131 // Register variable
	C_RPSYM   = 132 // Argument to function or procedure stored in register
	C_STSYM   = 133 // Statically allocated symbol
	C_BCOMM   = 135 // Beginning of common block
	C_ECOML   = 136 // Local member of common block
	C_ECOMM   = 137 // End of common block
	C_DECL    = 140 // Declaration of object
	C_ENTRY   = 141 // Alternate entry
	C_FUN     = 142 // Function or procedure
	C_BSTAT   = 143 // Beginning of static block
	C_ESTAT   = 144 // End of static block
	C_GTLS    = 145 // Global thread-local variable
	C_STTLS   = 146 // Static thread-local variable
)

Storage Class.

View Source
const (
	XTY_ER = 0 // External reference
	XTY_SD = 1 // Section definition
	XTY_LD = 2 // Label definition
	XTY_CM = 3 // Common csect definition
)

Symbol type field.

View Source
const (
	XFT_FN = 0   // Source File Name
	XFT_CT = 1   // Compile Time Stamp
	XFT_CV = 2   // Compiler Version Number
	XFT_CD = 128 // Compiler Defined Information
)

Defines for File auxiliary definitions: x_ftype field of x_file

View Source
const (
	XMC_PR     = 0  // Program code
	XMC_RO     = 1  // Read-only constant
	XMC_DB     = 2  // Debug dictionary table
	XMC_TC     = 3  // TOC entry
	XMC_UA     = 4  // Unclassified
	XMC_RW     = 5  // Read/Write data
	XMC_GL     = 6  // Global linkage
	XMC_XO     = 7  // Extended operation
	XMC_SV     = 8  // 32-bit supervisor call descriptor
	XMC_BS     = 9  // BSS class
	XMC_DS     = 10 // Function descriptor
	XMC_UC     = 11 // Unnamed FORTRAN common
	XMC_TC0    = 15 // TOC anchor
	XMC_TD     = 16 // Scalar data entry in the TOC
	XMC_SV64   = 17 // 64-bit supervisor call descriptor
	XMC_SV3264 = 18 // Supervisor call descriptor for both 32-bit and 64-bit
	XMC_TL     = 20 // Read/Write thread-local data
	XMC_UL     = 21 // Read/Write thread-local data (.tbss)
	XMC_TE     = 22 // TOC entry
)

Storage-mapping class.

View Source
const (
	LDHDRSZ_32 = 32
	LDHDRSZ_64 = 56
)
View Source
const (
	R_POS = 0x00 // A(sym) Positive Relocation
	R_NEG = 0x01 // -A(sym) Negative Relocation
	R_REL = 0x02 // A(sym-*) Relative to self
	R_TOC = 0x03 // A(sym-TOC) Relative to TOC
	R_TRL = 0x12 // A(sym-TOC) TOC Relative indirect load.

	R_TRLA = 0x13 // A(sym-TOC) TOC Rel load address. modifiable inst
	R_GL   = 0x05 // A(external TOC of sym) Global Linkage
	R_TCL  = 0x06 // A(local TOC of sym) Local object TOC address
	R_RL   = 0x0C // A(sym) Pos indirect load. modifiable instruction
	R_RLA  = 0x0D // A(sym) Pos Load Address. modifiable instruction
	R_REF  = 0x0F // AL0(sym) Non relocating ref. No garbage collect
	R_BA   = 0x08 // A(sym) Branch absolute. Cannot modify instruction
	R_RBA  = 0x18 // A(sym) Branch absolute. modifiable instruction
	R_BR   = 0x0A // A(sym-*) Branch rel to self. non modifiable
	R_RBR  = 0x1A // A(sym-*) Branch rel to self. modifiable instr

	R_TLS    = 0x20 // General-dynamic reference to TLS symbol
	R_TLS_IE = 0x21 // Initial-exec reference to TLS symbol
	R_TLS_LD = 0x22 // Local-dynamic reference to TLS symbol
	R_TLS_LE = 0x23 // Local-exec reference to TLS symbol
	R_TLSM   = 0x24 // Module reference to TLS symbol
	R_TLSML  = 0x25 // Module reference to local (own) module

	R_TOCU = 0x30 // Relative to TOC - high order bits
	R_TOCL = 0x31 // Relative to TOC - low order bits
)
View Source
const SYMESZ = 18

Variables

This section is empty.

Functions

This section is empty.

Types

type Archive

type Archive struct {
	ArchiveHeader
	Members []*Member
	// contains filtered or unexported fields
}

Archive represents an open AIX big archive.

func NewArchive

func NewArchive(r io.ReaderAt) (*Archive, error)

NewArchive creates a new Archive for accessing an AIX big archive in an underlying reader.

func OpenArchive

func OpenArchive(name string) (*Archive, error)

OpenArchive opens the named archive using os.Open and prepares it for use as an AIX big archive.

func (*Archive) Close

func (a *Archive) Close() error

Close closes the Archive. If the Archive was created using NewArchive directly instead of OpenArchive, Close has no effect.

func (*Archive) GetFile

func (arch *Archive) GetFile(name string) (*File, error)

GetFile returns the XCOFF file defined by member name. FIXME: This doesn't work if an archive has two members with the same name which can occur if a archive has both 32-bits and 64-bits files.

type ArchiveHeader

type ArchiveHeader struct {
	// contains filtered or unexported fields
}

MemberHeader holds information about a big archive file header

type AuxCSect32

type AuxCSect32 struct {
	Xscnlen   int32  // Length or symbol table index
	Xparmhash uint32 // Offset of parameter type-check string
	Xsnhash   uint16 // .typchk section number
	Xsmtyp    uint8  // Symbol alignment and type
	Xsmclas   uint8  // Storage-mapping class
	Xstab     uint32 // Reserved
	Xsnstab   uint16 // Reserved
}

csect Auxiliary Entry.

type AuxCSect64

type AuxCSect64 struct {
	Xscnlenlo uint32 // Lower 4 bytes of length or symbol table index
	Xparmhash uint32 // Offset of parameter type-check string
	Xsnhash   uint16 // .typchk section number
	Xsmtyp    uint8  // Symbol alignment and type
	Xsmclas   uint8  // Storage-mapping class
	Xscnlenhi int32  // Upper 4 bytes of length or symbol table index
	Xpad      uint8  // Unused
	Xauxtype  uint8  // Type of auxiliary entry
}

type AuxFcn32

type AuxFcn32 struct {
	Xexptr   uint32 // File offset to exception table entry
	Xfsize   uint32 // Size of function in bytes
	Xlnnoptr uint32 // File pointer to line number
	Xendndx  uint32 // Symbol table index of next entry
	Xpad     uint16 // Unused
}

Function Auxiliary Entry

type AuxFcn64

type AuxFcn64 struct {
	Xlnnoptr uint64 // File pointer to line number
	Xfsize   uint32 // Size of function in bytes
	Xendndx  uint32 // Symbol table index of next entry
	Xpad     uint8  // Unused
	Xauxtype uint8  // Type of auxiliary entry
}

type AuxFile64

type AuxFile64 struct {
	Xfname   [8]byte // Name or offset inside string table
	Xftype   uint8   // Source file string type
	Xauxtype uint8   // Type of auxiliary entry
}

File Auxiliary Entry

type AuxSect64

type AuxSect64 struct {
	Xscnlen uint64 // section length
	Xnreloc uint64 // Num RLDs

	Xauxtype uint8 // Type of auxiliary entry
	// contains filtered or unexported fields
}

type AuxiliaryCSect

type AuxiliaryCSect struct {
	Length              int64
	StorageMappingClass int
	SymbolType          int
}

AuxiliaryCSect holds information about an XCOFF symbol in an AUX_CSECT entry.

type AuxiliaryFcn

type AuxiliaryFcn struct {
	Size int64
}

AuxiliaryFcn holds information about an XCOFF symbol in an AUX_FCN entry.

type File

type File struct {
	FileHeader
	Sections     []*Section
	Symbols      []*Symbol
	StringTable  []byte
	LibraryPaths []string
	// contains filtered or unexported fields
}

A File represents an open XCOFF file.

func NewFile

func NewFile(r io.ReaderAt) (*File, error)

NewFile creates a new File for accessing an XCOFF binary in an underlying reader.

func Open

func Open(name string) (*File, error)

Open opens the named file using os.Open and prepares it for use as an XCOFF binary.

func (*File) CSect

func (f *File) CSect(name string) []byte

CSect reads and returns the contents of a csect.

func (*File) Close

func (f *File) Close() error

Close closes the File. If the File was created using NewFile directly instead of Open, Close has no effect.

func (*File) DWARF

func (f *File) DWARF() (*dwarf.Data, error)

func (*File) ImportedLibraries

func (f *File) ImportedLibraries() ([]string, error)

ImportedLibraries returns the names of all libraries referred to by the binary f that are expected to be linked with the binary at dynamic link time.

func (*File) ImportedSymbols

func (f *File) ImportedSymbols() ([]ImportedSymbol, error)

ImportedSymbols returns the names of all symbols referred to by the binary f that are expected to be satisfied by other libraries at dynamic load time. It does not return weak symbols.

func (*File) Section

func (f *File) Section(name string) *Section

Section returns the first section with the given name, or nil if no such section exists. Xcoff have section's name limited to 8 bytes. Some sections like .gosymtab can be trunked but this method will still find them.

func (*File) SectionByType

func (f *File) SectionByType(typ uint32) *Section

SectionByType returns the first section in f with the given type, or nil if there is no such section.

type FileHeader

type FileHeader struct {
	TargetMachine uint16
}

FileHeader holds information about an XCOFF file header.

type FileHeader32

type FileHeader32 struct {
	Fmagic   uint16 // Target machine
	Fnscns   uint16 // Number of sections
	Ftimedat int32  // Time and date of file creation
	Fsymptr  uint32 // Byte offset to symbol table start
	Fnsyms   int32  // Number of entries in symbol table
	Fopthdr  uint16 // Number of bytes in optional header
	Fflags   uint16 // Flags
}

File Header.

type FileHeader64

type FileHeader64 struct {
	Fmagic   uint16 // Target machine
	Fnscns   uint16 // Number of sections
	Ftimedat int32  // Time and date of file creation
	Fsymptr  uint64 // Byte offset to symbol table start
	Fopthdr  uint16 // Number of bytes in optional header
	Fflags   uint16 // Flags
	Fnsyms   int32  // Number of entries in symbol table
}

type ImportedSymbol

type ImportedSymbol struct {
	Name    string
	Library string
}

ImportedSymbol holds information about an imported XCOFF symbol.

type LoaderHeader32

type LoaderHeader32 struct {
	Lversion int32  // Loader section version number
	Lnsyms   int32  // Number of symbol table entries
	Lnreloc  int32  // Number of relocation table entries
	Listlen  uint32 // Length of import file ID string table
	Lnimpid  int32  // Number of import file IDs
	Limpoff  uint32 // Offset to start of import file IDs
	Lstlen   uint32 // Length of string table
	Lstoff   uint32 // Offset to start of string table
}

Loader Header.

type LoaderHeader64

type LoaderHeader64 struct {
	Lversion int32  // Loader section version number
	Lnsyms   int32  // Number of symbol table entries
	Lnreloc  int32  // Number of relocation table entries
	Listlen  uint32 // Length of import file ID string table
	Lnimpid  int32  // Number of import file IDs
	Lstlen   uint32 // Length of string table
	Limpoff  uint64 // Offset to start of import file IDs
	Lstoff   uint64 // Offset to start of string table
	Lsymoff  uint64 // Offset to start of symbol table
	Lrldoff  uint64 // Offset to start of relocation entries
}

type LoaderSymbol32

type LoaderSymbol32 struct {
	Lname   [8]byte // Symbol name or byte offset into string table
	Lvalue  uint32  // Address field
	Lscnum  int16   // Section number containing symbol
	Lsmtype int8    // Symbol type, export, import flags
	Lsmclas int8    // Symbol storage class
	Lifile  int32   // Import file ID; ordinal of import file IDs
	Lparm   uint32  // Parameter type-check field
}

Loader Symbol.

type LoaderSymbol64

type LoaderSymbol64 struct {
	Lvalue  uint64 // Address field
	Loffset uint32 // Byte offset into string table of symbol name
	Lscnum  int16  // Section number containing symbol
	Lsmtype int8   // Symbol type, export, import flags
	Lsmclas int8   // Symbol storage class
	Lifile  int32  // Import file ID; ordinal of import file IDs
	Lparm   uint32 // Parameter type-check field
}

type Member

type Member struct {
	MemberHeader
	// contains filtered or unexported fields
}

Member represents a member of an AIX big archive.

type MemberHeader

type MemberHeader struct {
	Name string
	Size uint64
}

MemberHeader holds information about a big archive member

type Reloc

type Reloc struct {
	VirtualAddress   uint64
	Symbol           *Symbol
	Signed           bool
	InstructionFixed bool
	Length           uint8
	Type             uint8
}

type Reloc32

type Reloc32 struct {
	Rvaddr  uint32 // (virtual) address of reference
	Rsymndx uint32 // Index into symbol table
	Rsize   uint8  // Sign and reloc bit len
	Rtype   uint8  // Toc relocation type
}

type Reloc64

type Reloc64 struct {
	Rvaddr  uint64 // (virtual) address of reference
	Rsymndx uint32 // Index into symbol table
	Rsize   uint8  // Sign and reloc bit len
	Rtype   uint8  // Toc relocation type
}

type Section

type Section struct {
	SectionHeader
	Relocs []Reloc
	io.ReaderAt
	// contains filtered or unexported fields
}

func (*Section) Data

func (s *Section) Data() ([]byte, error)

Data reads and returns the contents of the XCOFF section s.

type SectionHeader

type SectionHeader struct {
	Name           string
	VirtualAddress uint64
	Size           uint64
	Type           uint32
	Relptr         uint64
	Nreloc         uint32
}

SectionHeader holds information about an XCOFF section header.

type SectionHeader32

type SectionHeader32 struct {
	Sname    [8]byte // Section name
	Spaddr   uint32  // Physical address
	Svaddr   uint32  // Virtual address
	Ssize    uint32  // Section size
	Sscnptr  uint32  // Offset in file to raw data for section
	Srelptr  uint32  // Offset in file to relocation entries for section
	Slnnoptr uint32  // Offset in file to line number entries for section
	Snreloc  uint16  // Number of relocation entries
	Snlnno   uint16  // Number of line number entries
	Sflags   uint32  // Flags to define the section type
}

Section Header.

type SectionHeader64

type SectionHeader64 struct {
	Sname    [8]byte // Section name
	Spaddr   uint64  // Physical address
	Svaddr   uint64  // Virtual address
	Ssize    uint64  // Section size
	Sscnptr  uint64  // Offset in file to raw data for section
	Srelptr  uint64  // Offset in file to relocation entries for section
	Slnnoptr uint64  // Offset in file to line number entries for section
	Snreloc  uint32  // Number of relocation entries
	Snlnno   uint32  // Number of line number entries
	Sflags   uint32  // Flags to define the section type
	Spad     uint32  // Needs to be 72 bytes long
}

type SymEnt32

type SymEnt32 struct {
	Nname   [8]byte // Symbol name
	Nvalue  uint32  // Symbol value
	Nscnum  int16   // Section number of symbol
	Ntype   uint16  // Basic and derived type specification
	Nsclass int8    // Storage class of symbol
	Nnumaux int8    // Number of auxiliary entries
}

Symbol Table Entry.

type SymEnt64

type SymEnt64 struct {
	Nvalue  uint64 // Symbol value
	Noffset uint32 // Offset of the name in string table or .debug section
	Nscnum  int16  // Section number of symbol
	Ntype   uint16 // Basic and derived type specification
	Nsclass int8   // Storage class of symbol
	Nnumaux int8   // Number of auxiliary entries
}

type Symbol

type Symbol struct {
	Name          string
	Value         uint64
	SectionNumber int
	StorageClass  int
	AuxFcn        AuxiliaryFcn
	AuxCSect      AuxiliaryCSect
}

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