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//===-- llvm/BinaryFormat/XCOFF.h - The XCOFF file format -------*- C++/-*-===//
//
// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
// See https://llvm.org/LICENSE.txt for license information.
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
//
//===----------------------------------------------------------------------===//
//
// This file defines manifest constants for the XCOFF object file format.
//
//===----------------------------------------------------------------------===//
#ifndef LLVM_BINARYFORMAT_XCOFF_H
#define LLVM_BINARYFORMAT_XCOFF_H
#include "llvm/ADT/StringRef.h"
#include <cstdint>
namespace llvm {
namespace XCOFF {
// Constants used in the XCOFF definition.
enum { FileNamePadSize = 6, NameSize = 8, SymbolTableEntrySize = 18 };
enum ReservedSectionNum { N_DEBUG = -2, N_ABS = -1, N_UNDEF = 0 };
// x_smclas field of x_csect from system header: /usr/include/syms.h
/// Storage Mapping Class definitions.
enum StorageMappingClass : uint8_t {
// READ ONLY CLASSES
XMC_PR = 0, ///< Program Code
XMC_RO = 1, ///< Read Only Constant
XMC_DB = 2, ///< Debug Dictionary Table
XMC_GL = 6, ///< Global Linkage (Interfile Interface Code)
XMC_XO = 7, ///< Extended Operation (Pseudo Machine Instruction)
XMC_SV = 8, ///< Supervisor Call (32-bit process only)
XMC_SV64 = 17, ///< Supervisor Call for 64-bit process
XMC_SV3264 = 18, ///< Supervisor Call for both 32- and 64-bit processes
XMC_TI = 12, ///< Traceback Index csect
XMC_TB = 13, ///< Traceback Table csect
// READ WRITE CLASSES
XMC_RW = 5, ///< Read Write Data
XMC_TC0 = 15, ///< TOC Anchor for TOC Addressability
XMC_TC = 3, ///< General TOC item
XMC_TD = 16, ///< Scalar data item in the TOC
XMC_DS = 10, ///< Descriptor csect
XMC_UA = 4, ///< Unclassified - Treated as Read Write
XMC_BS = 9, ///< BSS class (uninitialized static internal)
XMC_UC = 11, ///< Un-named Fortran Common
XMC_TL = 20, ///< Initialized thread-local variable
XMC_UL = 21, ///< Uninitialized thread-local variable
XMC_TE = 22 ///< Symbol mapped at the end of TOC
};
// Flags for defining the section type. Used for the s_flags field of
// the section header structure. Defined in the system header `scnhdr.h`.
enum SectionTypeFlags {
STYP_PAD = 0x0008,
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
};
// STORAGE CLASSES, n_sclass field of syment.
// The values come from `storclass.h` and `dbxstclass.h`.
enum StorageClass : uint8_t {
// Storage classes used for symbolic debugging symbols.
C_FILE = 103, // File name
C_BINCL = 108, // Beginning of include file
C_EINCL = 109, // Ending of include file
C_GSYM = 128, // Global variable
C_STSYM = 133, // Statically allocated symbol
C_BCOMM = 135, // Beginning of common block
C_ECOMM = 137, // End of common block
C_ENTRY = 141, // Alternate entry
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 classes used for DWARF symbols.
C_DWARF = 112, // DWARF section symbol
// Storage classes used for absolute symbols.
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_ECOML = 136, // Local member of common block
C_FUN = 142, // Function or procedure
// Storage classes used for undefined external symbols or
// symbols of general sections.
C_EXT = 2, // External symbol
C_WEAKEXT = 111, // Weak external symbol
// Storage classes used for symbols of general sections.
C_NULL = 0,
C_STAT = 3, // Static
C_BLOCK = 100, // ".bb" or ".eb"
C_FCN = 101, // ".bf" or ".ef"
C_HIDEXT = 107, // Un-named external symbol
C_INFO = 110, // Comment string in .info section
C_DECL = 140, // Declaration of object (type)
// Storage classes - Obsolete/Undocumented.
C_AUTO = 1, // Automatic variable
C_REG = 4, // Register variable
C_EXTDEF = 5, // External definition
C_LABEL = 6, // Label
C_ULABEL = 7, // Undefined label
C_MOS = 8, // Member of structure
C_ARG = 9, // Function argument
C_STRTAG = 10, // Structure tag
C_MOU = 11, // Member of union
C_UNTAG = 12, // Union tag
C_TPDEF = 13, // Type definition
C_USTATIC = 14, // Undefined static
C_ENTAG = 15, // Enumeration tag
C_MOE = 16, // Member of enumeration
C_REGPARM = 17, // Register parameter
C_FIELD = 18, // Bit field
C_EOS = 102, // End of structure
C_LINE = 104,
C_ALIAS = 105, // Duplicate tag
C_HIDDEN = 106, // Special storage class for external
C_EFCN = 255, // Physical end of function
// Storage classes - reserved
C_TCSYM = 134 // Reserved
};
enum SymbolType {
XTY_ER = 0, ///< External reference.
XTY_SD = 1, ///< Csect definition for initialized storage.
XTY_LD = 2, ///< Label definition.
///< Defines an entry point to an initialized csect.
XTY_CM = 3 ///< Common csect definition. For uninitialized storage.
};
// Relocation types, defined in `/usr/include/reloc.h`.
enum RelocationType : uint8_t {
R_POS = 0x00, ///< Positive relocation. Provides the address of the referenced
///< symbol.
R_RL = 0x0c, ///< Positive indirect load relocation. Modifiable instruction.
R_RLA = 0x0d, ///< Positive load address relocation. Modifiable instruction.
R_NEG = 0x01, ///< Negative relocation. Provides the negative of the address
///< of the referenced symbol.
R_REL = 0x02, ///< Relative to self relocation. Provides a displacement value
///< between the address of the referenced symbol and the
///< address being relocated.
R_TOC = 0x03, ///< Relative to the TOC relocation. Provides a displacement
///< that is the difference between the address of the
///< referenced symbol and the TOC anchor csect.
R_TRL = 0x12, ///< TOC relative indirect load relocation. Similar to R_TOC,
///< but not modifiable instruction.
R_TRLA =
0x13, ///< Relative to the TOC or to the thread-local storage base
///< relocation. Compilers are not permitted to generate this
///< relocation type. It is the result of a reversible
///< transformation by the linker of an R_TOC relation that turned a
///< load instruction into an add-immediate instruction.
R_GL = 0x05, ///< Global linkage-external TOC address relocation. Provides the
///< address of the external TOC associated with a defined
///< external symbol.
R_TCL = 0x06, ///< Local object TOC address relocation. Provides the address
///< of the local TOC entry of a defined external symbol.
R_REF = 0x0f, ///< A non-relocating relocation. Used to prevent the binder
///< from garbage collecting a csect (such as code used for
///< dynamic initialization of non-local statics) for which
///< another csect has an implicit dependency.
R_BA = 0x08, ///< Branch absolute relocation. Provides the address of the
///< referenced symbol. References a non-modifiable instruction.
R_BR = 0x0a, ///< Branch relative to self relocation. Provides the
///< displacement that is the difference between the address of
///< the referenced symbol and the address of the referenced
///< branch instruction. References a non-modifiable instruction.
R_RBA = 0x18, ///< Branch absolute relocation. Similar to R_BA but
///< references a modifiable instruction.
R_RBR = 0x1a, ///< Branch relative to self relocation. Similar to the R_BR
///< relocation type, but references a modifiable instruction.
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. Provides a handle for the module
///< containing the referenced symbol.
R_TLSML = 0x25, ///< Module reference to the local TLS storage.
R_TOCU = 0x30, ///< Relative to TOC upper. Specifies the high-order 16 bits of
///< a large code model TOC-relative relocation.
R_TOCL = 0x31 ///< Relative to TOC lower. Specifies the low-order 16 bits of a
///< large code model TOC-relative relocation.
};
struct FileHeader32 {
uint16_t Magic;
uint16_t NumberOfSections;
int32_t TimeStamp;
uint32_t SymbolTableFileOffset;
int32_t NumberOfSymbolTableEntries;
uint16_t AuxiliaryHeaderSize;
uint16_t Flags;
};
struct SectionHeader32 {
char Name[XCOFF::NameSize];
uint32_t PhysicalAddress;
uint32_t VirtualAddress;
uint32_t Size;
uint32_t FileOffsetToData;
uint32_t FileOffsetToRelocations;
uint32_t FileOffsetToLineNumbers;
uint16_t NumberOfRelocations;
uint16_t NumberOfLineNumbers;
int32_t Flags;
};
enum CFileStringType : uint8_t {
XFT_FN = 0, ///< Specifies the source-file name.
XFT_CT = 1, ///< Specifies the compiler time stamp.
XFT_CV = 2, ///< Specifies the compiler version number.
XFT_CD = 128 ///< Specifies compiler-defined information.
};
enum CFileLangId : uint8_t {
TB_C = 0, ///< C language.
TB_CPLUSPLUS = 9 ///< C++ language.
};
enum CFileCpuId : uint8_t {
TCPU_PPC64 = 2, ///< PowerPC common architecture 64-bit mode.
TCPU_COM = 3, ///< POWER and PowerPC architecture common.
TCPU_970 = 19 ///< PPC970 - PowerPC 64-bit architecture.
};
StringRef getMappingClassString(XCOFF::StorageMappingClass SMC);
} // end namespace XCOFF
} // end namespace llvm
#endif
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