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Add support for reading ARM ELF build attributes.

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Build attribute sections can now be read if they exist via ELFObjectFile, and
the llvm-readobj tool has been extended with an option to dump this information
if requested. Regression tests are also included which exercise these features.

Also update the docs with a fixed ARM ABI link and a new link to the Addenda
which provides the build attributes specification.

llvm-svn: 181009
This commit is contained in:
Amara Emerson 2013-05-03 11:36:35 +00:00
parent 78396a723e
commit 863672f436
11 changed files with 652 additions and 140 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

4
docs/CompilerWriterInfo.rst
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@ -18,7 +18,9 @@ ARM
* `ARM documentation <http://www.arm.com/documentation/>`_ (`Processor Cores <http://www.arm.com/documentation/ARMProcessor_Cores/>`_ Cores)
* `ABI <http://www.arm.com/products/DevTools/ABI.html>`_
* `ELF ABI <http://infocenter.arm.com/help/topic/com.arm.doc.ihi0044e/IHI0044E_aaelf.pdf>`_
* `Addenda to the ARM ABI <http://infocenter.arm.com/help/topic/com.arm.doc.ihi0045d/IHI0045D_ABI_addenda.pdf>`_
* `ARM C Language Extensions <http://infocenter.arm.com/help/topic/com.arm.doc.ihi0053a/IHI0053A_acle.pdf>`_

186
include/llvm/Object/ELF.h
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@ -19,11 +19,13 @@
#include "llvm/ADT/SmallVector.h"
#include "llvm/ADT/StringSwitch.h"
#include "llvm/ADT/Triple.h"
#include "llvm/Object/ELF_ARM.h"
#include "llvm/Object/ObjectFile.h"
#include "llvm/Support/Casting.h"
#include "llvm/Support/ELF.h"
#include "llvm/Support/Endian.h"
#include "llvm/Support/ErrorHandling.h"
#include "llvm/Support/LEB128.h"
#include "llvm/Support/MemoryBuffer.h"
#include "llvm/Support/raw_ostream.h"
#include <algorithm>
@ -601,6 +603,7 @@ private:
const Elf_Shdr *dot_gnu_version_sec; // .gnu.version
const Elf_Shdr *dot_gnu_version_r_sec; // .gnu.version_r
const Elf_Shdr *dot_gnu_version_d_sec; // .gnu.version_d
const Elf_Shdr *dot_arm_attributes_sec; // .ARM.attributes
// Pointer to SONAME entry in dynamic string table
// This is set the first time getLoadName is called.
@ -643,6 +646,11 @@ private:
const Elf_Shdr *getRelSection(DataRefImpl Rel) const {
return getSection(Rel.w.b);
}
// Helper to read a single ARM attribute at the given pointer and return the
// read pointer moved forward to the next attribute location.
uintptr_t readARMSingleAttribute(uintptr_t ReadPtr,
ARMBuildAttrs::ARMGenericBuildAttrInfo &Attrs,
SmallVector<unsigned, 16> &TagSet) const;
public:
bool isRelocationHasAddend(DataRefImpl Rel) const;
@ -838,6 +846,18 @@ public:
return v->getType() == getELFType(ELFT::TargetEndianness == support::little,
ELFT::Is64Bits);
}
/// \brief Read the ARM build attributes of this object file.
/// \param Attrs The attributes container to put the attribute values.
/// \param TagsSet A list of attribute tags that were read.
error_code readARMBuildAttributes(
ARMBuildAttrs::ARMGenericBuildAttrInfo &Attrs,
SmallVector<unsigned, 16> &TagsSet) const;
/// \brief Checks if an ARM build attributes section exists.
bool hasARMBuildAttributes() const {
return dot_arm_attributes_sec ? true : false;
}
};
// Iterate through the version definitions, and place each Elf_Verdef
@ -2330,6 +2350,7 @@ ELFObjectFile<ELFT>::ELFObjectFile(MemoryBuffer *Object, error_code &ec)
, dot_gnu_version_sec(0)
, dot_gnu_version_r_sec(0)
, dot_gnu_version_d_sec(0)
, dot_arm_attributes_sec(0)
, dt_soname(0)
{
@ -2421,6 +2442,13 @@ ELFObjectFile<ELFT>::ELFObjectFile(MemoryBuffer *Object, error_code &ec)
dot_gnu_version_r_sec = sh;
break;
}
case ELF::SHT_ARM_ATTRIBUTES: {
if (dot_arm_attributes_sec != NULL)
// FIXME: Proper error handling.
report_fatal_error("More than one .arm.attributes section!");
dot_arm_attributes_sec = sh;
break;
}
}
++sh;
}
@ -2970,6 +2998,164 @@ static inline error_code GetELFSymbolVersion(const ObjectFile *Obj,
llvm_unreachable("Object passed to GetELFSymbolVersion() is not ELF");
}
template<class ELFT>
error_code ELFObjectFile<ELFT>::readARMBuildAttributes(
ARMBuildAttrs::ARMGenericBuildAttrInfo &Attrs,
SmallVector<unsigned, 16> &TagsSet) const {
if (getArch() != Triple::arm)
return object_error::invalid_file_type;
if (!dot_arm_attributes_sec)
return object_error::parse_failed;
const char *SecStart = (const char*)base() +
dot_arm_attributes_sec->sh_offset;
const char *SecEnd = SecStart + dot_arm_attributes_sec->sh_size;
char format_version = *SecStart;
if (format_version != ARMBuildAttrs::Format_Version)
return object_error::parse_failed;
uintptr_t SSectionPtr = (uintptr_t)SecStart + 1;
uintptr_t ReadPtr = SSectionPtr;
// Begin reading section after format-version byte
while (ReadPtr < (uintptr_t)SecEnd) {
// Read a subsection, starting with: <section-length> "vendor-name"
// For now, we only care about the "aeabi" pseudo-vendor subsection.
uint32_t SSectionLen = *(Elf_Word*)ReadPtr;
ReadPtr += sizeof(uint32_t);
StringRef Vendor((char*)(ReadPtr));
ReadPtr += Vendor.size() + 1; // Vendor string + NUL byte
if (Vendor != "aeabi") {
SSectionPtr += SSectionLen;
ReadPtr = SSectionPtr;
continue; //skip to the next sub-section
}
bool FoundFileTag = false;
uintptr_t SSSectionPtr = ReadPtr;
uint32_t SSSectionLen = *(Elf_Word*)ReadPtr;
// Found aeabi subsection, now find the File scope tag.
while (ReadPtr < SSectionPtr + SSectionLen) {
unsigned n = 0;
uint64_t Tag = decodeULEB128((uint8_t*)ReadPtr, &n);
ReadPtr += n;
SSSectionLen = *(Elf_Word*)ReadPtr;
if (Tag == ARMBuildAttrs::File) {
FoundFileTag = true;
break;
}
// We only handle File scope attributes, skip ahead to the next
// sub-subsection.
SSSectionPtr += SSSectionLen;
ReadPtr = SSSectionPtr;
}
if (!FoundFileTag)
return object_error::parse_failed;
ReadPtr += sizeof(uint32_t);
while (ReadPtr < SSSectionPtr + SSSectionLen) {
// Read any number of attributes.
// Attributes are pairs of <uleb128, uleb128> or <uleb128, NTBS>.
ReadPtr = readARMSingleAttribute(ReadPtr, Attrs, TagsSet);
}
Attrs.setValid(true);
}
return object_error::success;
}
#define SWITCH_ARM_ATTR_READ_ULEB(X) case ARMBuildAttrs::X: \
UlebValue = decodeULEB128((uint8_t*)ReadPtr, &n); \
ReadPtr += n; \
Attrs.Tag_##X = UlebValue; \
TagsSet.push_back(tag); \
break;
template<class ELFT>
uintptr_t ELFObjectFile<ELFT>::readARMSingleAttribute(uintptr_t ReadPtr,
ARMBuildAttrs::ARMGenericBuildAttrInfo &Attrs,
SmallVector<unsigned, 16> &TagsSet) const {
// The ABI says that tags in the range 0-63 must be handled by tools.
unsigned n = 0;
uint64_t tagInt = decodeULEB128((uint8_t*)ReadPtr, &n);
ARMBuildAttrs::AttrType tag = (ARMBuildAttrs::AttrType)tagInt;
ReadPtr += n;
uint64_t UlebValue = 0;
StringRef StrValue;
switch (tag) {
case ARMBuildAttrs::CPU_arch: // uleb128
UlebValue = decodeULEB128((uint8_t*)ReadPtr, &n);
ReadPtr += n;
Attrs.Tag_CPU_arch = (ARMBuildAttrs::CPUArch)UlebValue;
TagsSet.push_back(tag);
break;
case ARMBuildAttrs::CPU_raw_name: // NTBS
StrValue = (char*)ReadPtr;
Attrs.Tag_CPU_raw_name = StrValue;
TagsSet.push_back(ARMBuildAttrs::CPU_raw_name);
ReadPtr += StrValue.size() + 1;
break;
case ARMBuildAttrs::CPU_name: //NTBS
StrValue = (char*)ReadPtr;
Attrs.Tag_CPU_name = StrValue;
TagsSet.push_back(ARMBuildAttrs::CPU_name);
ReadPtr += StrValue.size() + 1;
break;
case ARMBuildAttrs::CPU_arch_profile: // uleb128
UlebValue = decodeULEB128((uint8_t*)ReadPtr, &n);
ReadPtr += n;
Attrs.Tag_CPU_arch_profile =
(ARMBuildAttrs::CPUArchProfile)UlebValue;
TagsSet.push_back(tag);
break;
SWITCH_ARM_ATTR_READ_ULEB(ARM_ISA_use)
SWITCH_ARM_ATTR_READ_ULEB(THUMB_ISA_use)
SWITCH_ARM_ATTR_READ_ULEB(FP_arch)
SWITCH_ARM_ATTR_READ_ULEB(WMMX_arch)
SWITCH_ARM_ATTR_READ_ULEB(Advanced_SIMD_arch)
SWITCH_ARM_ATTR_READ_ULEB(FP_HP_extension)
SWITCH_ARM_ATTR_READ_ULEB(CPU_unaligned_access)
SWITCH_ARM_ATTR_READ_ULEB(MPextension_use)
SWITCH_ARM_ATTR_READ_ULEB(DIV_use)
SWITCH_ARM_ATTR_READ_ULEB(T2EE_use)
SWITCH_ARM_ATTR_READ_ULEB(Virtualization_use)
SWITCH_ARM_ATTR_READ_ULEB(ABI_optimization_goals)
SWITCH_ARM_ATTR_READ_ULEB(ABI_FP_optimization_goals)
SWITCH_ARM_ATTR_READ_ULEB(PCS_config)
SWITCH_ARM_ATTR_READ_ULEB(ABI_PCS_R9_use)
SWITCH_ARM_ATTR_READ_ULEB(ABI_PCS_RW_data)
SWITCH_ARM_ATTR_READ_ULEB(ABI_PCS_RO_data)
SWITCH_ARM_ATTR_READ_ULEB(ABI_PCS_GOT_use)
SWITCH_ARM_ATTR_READ_ULEB(ABI_PCS_wchar_t)
SWITCH_ARM_ATTR_READ_ULEB(ABI_enum_size)
SWITCH_ARM_ATTR_READ_ULEB(ABI_align8_needed)
SWITCH_ARM_ATTR_READ_ULEB(ABI_align8_preserved)
SWITCH_ARM_ATTR_READ_ULEB(ABI_FP_rounding)
SWITCH_ARM_ATTR_READ_ULEB(ABI_FP_denormal)
SWITCH_ARM_ATTR_READ_ULEB(ABI_FP_number_model)
SWITCH_ARM_ATTR_READ_ULEB(ABI_FP_exceptions)
SWITCH_ARM_ATTR_READ_ULEB(ABI_FP_user_exceptions)
SWITCH_ARM_ATTR_READ_ULEB(ABI_HardFP_use)
SWITCH_ARM_ATTR_READ_ULEB(ABI_VFP_args)
default:
// Unhandled build attribute tag, according to the spec we should be able
// to infer the type of the value from (tag % 2) and skip over it.
if (tag & 0x1) {
// Value should be a null terminated byte string
StrValue = (char*)ReadPtr;
ReadPtr += StrValue.size() + 1;
} else {
// Value should be a uleb128
UlebValue = decodeULEB128((uint8_t*)ReadPtr, &n);
ReadPtr += n;
}
break;
}
return ReadPtr;
}
#undef SWITCH_ARM_ATTR_READ_ULEB
/// This function returns the hash value for a symbol in the .dynsym section
/// Name of the API remains consistent as specified in the libelf
/// REF : http://www.sco.com/developers/gabi/latest/ch5.dynamic.html#hash

339
include/llvm/Object/ELF_ARM.h Normal file
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@ -0,0 +1,339 @@
//===-- ELF_ARM.h - ARM ELF ABI ---------------------------------*- C++ -*-===//
//
// The LLVM Compiler Infrastructure
//
// This file is distributed under the University of Illinois Open Source
// License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
//
// This file contains enumerations and support routines for ARM build attributes
// as defined in ARM ABI addenda document (ABI release 2.08).
//
//===----------------------------------------------------------------------===//
#ifndef LLVM_OBJECT_ELF_ARM_H
#define LLVM_OBJECT_ELF_ARM_H
#include "llvm/ADT/SmallVector.h"
#include "llvm/Support/Endian.h"
namespace llvm {
namespace ARMBuildAttrs {
enum SpecialAttr {
// This is for the .cpu asm attr. It translates into one or more
// AttrType (below) entries in the .ARM.attributes section in the ELF.
SEL_CPU
};
enum AttrType {
// Rest correspond to ELF/.ARM.attributes
File = 1,
Section = 2,
Symbol = 3,
CPU_raw_name = 4,
CPU_name = 5,
CPU_arch = 6,
CPU_arch_profile = 7,
ARM_ISA_use = 8,
THUMB_ISA_use = 9,
FP_arch = 10,
WMMX_arch = 11,
Advanced_SIMD_arch = 12,
PCS_config = 13,
ABI_PCS_R9_use = 14,
ABI_PCS_RW_data = 15,
ABI_PCS_RO_data = 16,
ABI_PCS_GOT_use = 17,
ABI_PCS_wchar_t = 18,
ABI_FP_rounding = 19,
ABI_FP_denormal = 20,
ABI_FP_exceptions = 21,
ABI_FP_user_exceptions = 22,
ABI_FP_number_model = 23,
ABI_align8_needed = 24,
ABI_align8_preserved = 25,
ABI_enum_size = 26,
ABI_HardFP_use = 27,
ABI_VFP_args = 28,
ABI_WMMX_args = 29,
ABI_optimization_goals = 30,
ABI_FP_optimization_goals = 31,
compatibility = 32,
CPU_unaligned_access = 34,
FP_HP_extension = 36,
ABI_FP_16bit_format = 38,
MPextension_use = 42, // was 70, 2.08 ABI
DIV_use = 44,
nodefaults = 64,
also_compatible_with = 65,
T2EE_use = 66,
conformance = 67,
Virtualization_use = 68,
MPextension_use_old = 70
};
// Magic numbers for .ARM.attributes
enum AttrMagic {
Format_Version = 0x41
};
// Legal Values for CPU_arch, (=6), uleb128
enum CPUArch {
Pre_v4 = 0,
v4 = 1, // e.g. SA110
v4T = 2, // e.g. ARM7TDMI
v5T = 3, // e.g. ARM9TDMI
v5TE = 4, // e.g. ARM946E_S
v5TEJ = 5, // e.g. ARM926EJ_S
v6 = 6, // e.g. ARM1136J_S
v6KZ = 7, // e.g. ARM1176JZ_S
v6T2 = 8, // e.g. ARM1156T2F_S
v6K = 9, // e.g. ARM1136J_S
v7 = 10, // e.g. Cortex A8, Cortex M3
v6_M = 11, // e.g. Cortex M1
v6S_M = 12, // v6_M with the System extensions
v7E_M = 13, // v7_M with DSP extensions
v8
};
enum CPUArchProfile { // (=7), uleb128
Not_Applicable = 0, // pre v7, or cross-profile code
ApplicationProfile = (0x41), // 'A' (e.g. for Cortex A8)
RealTimeProfile = (0x52), // 'R' (e.g. for Cortex R4)
MicroControllerProfile = (0x4D), // 'M' (e.g. for Cortex M3)
SystemProfile = (0x53) // 'S' Application or real-time profile
};
// The following have a lot of common use cases
enum {
//ARMISAUse (=8), uleb128 and THUMBISAUse (=9), uleb128
Not_Allowed = 0,
Allowed = 1
};
enum {
// FP_arch (=10), uleb128 (formerly Tag_VFP_arch = 10)
AllowFPv2 = 2, // v2 FP ISA permitted (implies use of the v1 FP ISA)
AllowFPv3A = 3, // v3 FP ISA permitted (implies use of the v2 FP ISA)
AllowFPv3B = 4, // v3 FP ISA permitted, but only D0-D15, S0-S31
AllowFPv4A = 5, // v4 FP ISA permitted (implies use of v3 FP ISA)
AllowFPv4B = 6, // v4 FP ISA was permitted, but only D0-D15, S0-S31
AllowV8FP = 7, // ARMv8-A FP ISA permitted
AllowV8FPB = 8 // ARMv8-A FP ISA permitted, but only D0-D15, S0-D31
};
enum {
// Tag_THUMB_ISA_use, (=9), uleb128
AllowThumb32 = 2 // 32-bit Thumb (implies 16-bit instructions)
};
enum {
// Tag_WMMX_arch, (=11), uleb128
AllowWMMXv1 = 1, // The user permitted this entity to use WMMX v1
AllowWMMXv2 = 2 // The user permitted this entity to use WMMX v2
};
enum {
// Tag_ABI_FP_denormal, (=20), uleb128
MightFlushToZero = 0, // Denormal numbers might be flushed to (+) zero
IEEE754Denormal = 1 , // Depends on IEEE 754 denormal numbers
PreserveFPSign = 2 // Sign when flushed-to-zero is preserved
};
enum {
// Tag_ABI_FP_number_model, (=23), uleb128
AllowNormal = 1, // Use IEEE 754 format normal numbers only
AllowRTABI = 2, // numbers, infinities, and one quiet NaN (see [RTABI])
AllowIEE754 = 3 // this code to use all the IEEE 754-defined FP encodings
};
enum {
// Tag_ABI_FP_rounding, (=19), uleb128
FPRoundingNearest = 0, // Use the IEEE 754 round to nearest rounding mode
FPRoundingRuntime = 1 // Choose the IEEE 754 rounding mode at run time
};
enum {
// Tag_DIV_use, (=44), uleb128
AllowDIVThumb = 0, // Allow SDIV, UDIV on Thumb ISA, e.g. Cortex R4 or M3
NotAllowedDIV = 1, // Disallow SDIV and UDIV
AllowDIVv7a = 2 // Allow SDIV, UDIV on v7-a with integer div extension
};
enum {
// Tag_Virtualization_use, (=42), uleb128
TrustZone = 1, // Use of the TrustZone extension was permitted
VirtExts = 2, // Use of virtualization extensions (HVC, ERET) permitted
TrustZoneVirtExts = 3 // TrustZone and virtualization extensions permitted
};
enum {
// Tag_PCS_config, (=13), uleb128
PCS_none = 0, // No standard configuration used, or no information recorded
PCS_bare = 1, // Bare platform configuration
PCS_linux = 2, // Linux application configuration
PCS_linux_dso = 3, // Linux DSO configuration
PCS_palm_2004 = 4, // Palm OS 2004 configuration
PCS_palm_future = 5, // Reserved to future Palm OS configuration
PCS_symbian_2004 = 6, // Symbian OS 2004 configuration
PCS_symbian_future = 7 // Reserved to future Symbian OS configuration
};
enum {
// Tag_ABI_PCS_R9_use, (=14), uleb128
PCS_R9_normal = 0, // R9 used as V6 (just another callee-saved register,
// implied by omitting the tag)
PCS_R9_SB = 1, // R9 used as SB, a global Static Base register
PCS_R9_TLS = 2, // R9 used as a Thread Local Storage (TLS) pointer
PCS_R9_none = 3 // R9 not used at all by code associated with
// the attributed entity.
};
enum {
// Tag_ABI_PCS_RW_data, (=15), uleb128
PCS_RW_data_abs = 0, // RW static data permitted to be addressed absolutely
PCS_RW_data_pcrel = 1, // RW static data was only permitted to be
// addressed PC-relative.
PCS_RW_data_sbrel = 2, // RW static data was only permitted to be addressed
// SB-relative.
PCS_RW_data_none = 3 // No permission to use RW static data
};
enum {
// Tag_ABI_PCS_RO_data, (=16), uleb128
PCS_RO_data_abs = 0, // RO static data permitted to be addressed absolutely
PCS_RO_data_pcrel = 1, // RO static data was only permitted to be
// addressed PC-relative.
PCS_RO_data_none = 2 // No permission to use RO static data
};
enum {
// Tag_ABI_PCS_GOT_use, (=17), uleb128
PCS_GOT_none = 0, // No permission to import static data
PCS_GOT_direct = 1, // Permission to address imported data directly
PCS_GOT_indirect = 2 // The user permitted this entity to address imported
// data indirectly (e.g. via a GOT)
};
enum {
// Tag_ABI_PCS_wchar_t, (=18), uleb128
PCS_wchar_t_disallowed = 0, // The user prohibited the use of wchar_t
PCS_wchar_t_2 = 2, // The user intended the size of wchar_t to be 2
PCS_wchar_t_4 = 4 // The user intended the size of wchar_t to be 4
};
enum {
// Tag_ABI_enum_size, (=26), uleb128
PCS_enum_size = 1, // Enum values occupy the smallest container big enough
// to hold all their values.
PCS_enum_size_32 = 2, // The user intended Enum containers to be 32-bit
PCS_enum_size_abi32 = 3 // The user intended that every enumeration visible
// across an ABI-complying interface contains a value needing 32 bits to
// encode it; other enums can be containerized.
};
enum {
// Tag_ABI_align_needed, (=24), uleb128
PCS_Align_needed_disallowed = 0, // The user did not permit code to depend
// the alignment of 8-byte data or data with extended (>8-byte) alignment.
PCS_Align_needed_8 = 1, // Code was permitted to depend on the 8-byte
// alignment of 8-byte data items.
PCS_Align_needed_4 = 2, // Code was permitted to depend on the 4-byte
// alignment of 8-byte data items.
PCS_Align_needed_res = 3 // Reserved
// OR: n (in 4..12) Code was permitted to depend on the 8-byte alignment of
// 8-byte data items and the alignment of data items having up to 2^n byte
// extended alignment.
};
enum {
// Tag_ABI_align_preserved, (=25), uleb128
PCS_Align_preserved_none = 0, // The user did not require code to preserve
// 8-byte alignment of 8-byte data objects.
PCS_Align_preserved_8 = 1, // Code was required to preserve 8-byte alignment
// of 8-byte data objects.
PCS_Align_preserved_8sp = 2, // Code was required to preserve 8-byte
// alignment of 8-byte data objects and to ensure (SP MOD 8) = 0 at all
// instruction boundaries (not just at function calls).
PCS_Align_preserved_res = 3 // Reserved
// OR: n (in 4..12) Code was required to preserve the alignments of case 2
// and the alignment of data items having up to 2^n byte extended alignment
};
enum {
// Tag_ABI_HardFP_use, (=27), uleb128
HardFPImplied = 0, // FP use should be implied by Tag_FP_arch
HardFP_SP_VFP = 1, // Use only SP FP instructions
HardFP_Reserved = 2, // Reserved
HardFP_ImpliedDup = 3 // Deprecated duplicate of the default HardFPImplied
};
enum {
// Tag_ABI_VFP_args, (=28), uleb128
VFPArgs_base = 0, // FP parameter/result passing using AAPCS, base variant
VFPArgs_VFP = 1, // FP parameter/result passing using AAPCS, VFP variant
VFPArgs_toolchain = 2, // FP parameter/result passing to conform to tool
// chain-specific conventions
VFPArgs_baseVFP = 3 // FP parameter/result passing using both base and VFP
//variants. Did not permit non-variadic functions to pass FP params/results.
};
/// Contains build ARM aeabi attribute values.
class ARMGenericBuildAttrInfo {
public:
ARMGenericBuildAttrInfo()
: Valid(false) {}
CPUArch Tag_CPU_arch;
CPUArchProfile Tag_CPU_arch_profile;
std::string Tag_CPU_raw_name;
std::string Tag_CPU_name;
unsigned Tag_ARM_ISA_use;
unsigned Tag_THUMB_ISA_use;
unsigned Tag_FP_arch;
unsigned Tag_WMMX_arch;
unsigned Tag_Advanced_SIMD_arch;
unsigned Tag_FP_HP_extension;
unsigned Tag_CPU_unaligned_access;
unsigned Tag_MPextension_use;
unsigned Tag_DIV_use;
unsigned Tag_T2EE_use;
unsigned Tag_Virtualization_use;
unsigned Tag_ABI_optimization_goals;
unsigned Tag_ABI_FP_optimization_goals;
//PCS/ABI attributes
unsigned Tag_PCS_config;
unsigned Tag_ABI_PCS_R9_use;
unsigned Tag_ABI_PCS_RW_data;
unsigned Tag_ABI_PCS_RO_data;
unsigned Tag_ABI_PCS_GOT_use;
unsigned Tag_ABI_PCS_wchar_t;
unsigned Tag_ABI_enum_size;
unsigned Tag_ABI_align8_needed;
unsigned Tag_ABI_align8_preserved;
//FP
unsigned Tag_ABI_FP_rounding;
unsigned Tag_ABI_FP_denormal;
unsigned Tag_ABI_FP_number_model;
unsigned Tag_ABI_FP_exceptions;
unsigned Tag_ABI_FP_user_exceptions;
unsigned Tag_ABI_HardFP_use;
unsigned Tag_ABI_VFP_args;
private:
bool Valid;
public:
/// Indicates whether this instance contains valid or default values.
bool isValid() { return Valid; }
void setValid(bool v) { Valid = v; }
};
}
} // llvm
#endif // LLVM_OBJECT_ELF_ARM_H

16
lib/Target/ARM/ARMAsmPrinter.cpp
View File

@ -15,7 +15,6 @@
#define DEBUG_TYPE "asm-printer"
#include "ARMAsmPrinter.h"
#include "ARM.h"
#include "ARMBuildAttrs.h"
#include "ARMConstantPoolValue.h"
#include "ARMMachineFunctionInfo.h"
#include "ARMTargetMachine.h"
@ -44,6 +43,7 @@
#include "llvm/MC/MCSectionMachO.h"
#include "llvm/MC/MCStreamer.h"
#include "llvm/MC/MCSymbol.h"
#include "llvm/Object/ELF_ARM.h"
#include "llvm/Support/CommandLine.h"
#include "llvm/Support/Debug.h"
#include "llvm/Support/ELF.h"
@ -90,7 +90,7 @@ namespace {
break;
/* GAS requires .fpu to be emitted regardless of EABI attribute */
case ARMBuildAttrs::Advanced_SIMD_arch:
case ARMBuildAttrs::VFP_arch:
case ARMBuildAttrs::FP_arch:
Streamer.EmitRawText(StringRef("\t.fpu ") + String.lower());
break;
}
@ -798,24 +798,24 @@ void ARMAsmPrinter::emitAttributes() {
/* VFPv4 + .fpu */
if (Subtarget->hasVFP4()) {
AttrEmitter->EmitAttribute(ARMBuildAttrs::VFP_arch,
AttrEmitter->EmitAttribute(ARMBuildAttrs::FP_arch,
ARMBuildAttrs::AllowFPv4A);
if (emitFPU)
AttrEmitter->EmitTextAttribute(ARMBuildAttrs::VFP_arch, "vfpv4");
AttrEmitter->EmitTextAttribute(ARMBuildAttrs::FP_arch, "vfpv4");
/* VFPv3 + .fpu */
} else if (Subtarget->hasVFP3()) {
AttrEmitter->EmitAttribute(ARMBuildAttrs::VFP_arch,
AttrEmitter->EmitAttribute(ARMBuildAttrs::FP_arch,
ARMBuildAttrs::AllowFPv3A);
if (emitFPU)
AttrEmitter->EmitTextAttribute(ARMBuildAttrs::VFP_arch, "vfpv3");
AttrEmitter->EmitTextAttribute(ARMBuildAttrs::FP_arch, "vfpv3");
/* VFPv2 + .fpu */
} else if (Subtarget->hasVFP2()) {
AttrEmitter->EmitAttribute(ARMBuildAttrs::VFP_arch,
AttrEmitter->EmitAttribute(ARMBuildAttrs::FP_arch,
ARMBuildAttrs::AllowFPv2);
if (emitFPU)
AttrEmitter->EmitTextAttribute(ARMBuildAttrs::VFP_arch, "vfpv2");
AttrEmitter->EmitTextAttribute(ARMBuildAttrs::FP_arch, "vfpv2");
}
/* TODO: ARMBuildAttrs::Allowed is not completely accurate,

131
lib/Target/ARM/ARMBuildAttrs.h
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@ -1,131 +0,0 @@
//===-- ARMBuildAttrs.h - ARM Build Attributes ------------------*- C++ -*-===//
//
// The LLVM Compiler Infrastructure
//
// This file is distributed under the University of Illinois Open Source
// License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
//
// This file contains enumerations and support routines for ARM build attributes
// as defined in ARM ABI addenda document (ABI release 2.08).
//
//===----------------------------------------------------------------------===//
#ifndef __TARGET_ARMBUILDATTRS_H__
#define __TARGET_ARMBUILDATTRS_H__
namespace ARMBuildAttrs {
enum SpecialAttr {
// This is for the .cpu asm attr. It translates into one or more
// AttrType (below) entries in the .ARM.attributes section in the ELF.
SEL_CPU
};
enum AttrType {
// Rest correspond to ELF/.ARM.attributes
File = 1,
Section = 2,
Symbol = 3,
CPU_raw_name = 4,
CPU_name = 5,
CPU_arch = 6,
CPU_arch_profile = 7,
ARM_ISA_use = 8,
THUMB_ISA_use = 9,
VFP_arch = 10,
WMMX_arch = 11,
Advanced_SIMD_arch = 12,
PCS_config = 13,
ABI_PCS_R9_use = 14,
ABI_PCS_RW_data = 15,
ABI_PCS_RO_data = 16,
ABI_PCS_GOT_use = 17,
ABI_PCS_wchar_t = 18,
ABI_FP_rounding = 19,
ABI_FP_denormal = 20,
ABI_FP_exceptions = 21,
ABI_FP_user_exceptions = 22,
ABI_FP_number_model = 23,
ABI_align8_needed = 24,
ABI_align8_preserved = 25,
ABI_enum_size = 26,
ABI_HardFP_use = 27,
ABI_VFP_args = 28,
ABI_WMMX_args = 29,
ABI_optimization_goals = 30,
ABI_FP_optimization_goals = 31,
compatibility = 32,
CPU_unaligned_access = 34,
VFP_HP_extension = 36,
ABI_FP_16bit_format = 38,
MPextension_use = 42, // was 70, 2.08 ABI
DIV_use = 44,
nodefaults = 64,
also_compatible_with = 65,
T2EE_use = 66,
conformance = 67,
Virtualization_use = 68,
MPextension_use_old = 70
};
// Magic numbers for .ARM.attributes
enum AttrMagic {
Format_Version = 0x41
};
// Legal Values for CPU_arch, (=6), uleb128
enum CPUArch {
Pre_v4 = 0,
v4 = 1, // e.g. SA110
v4T = 2, // e.g. ARM7TDMI
v5T = 3, // e.g. ARM9TDMI
v5TE = 4, // e.g. ARM946E_S
v5TEJ = 5, // e.g. ARM926EJ_S
v6 = 6, // e.g. ARM1136J_S
v6KZ = 7, // e.g. ARM1176JZ_S
v6T2 = 8, // e.g. ARM1156T2F_S
v6K = 9, // e.g. ARM1136J_S
v7 = 10, // e.g. Cortex A8, Cortex M3
v6_M = 11, // e.g. Cortex M1
v6S_M = 12, // v6_M with the System extensions
v7E_M = 13 // v7_M with DSP extensions
};
enum CPUArchProfile { // (=7), uleb128
Not_Applicable = 0, // pre v7, or cross-profile code
ApplicationProfile = (0x41), // 'A' (e.g. for Cortex A8)
RealTimeProfile = (0x52), // 'R' (e.g. for Cortex R4)
MicroControllerProfile = (0x4D), // 'M' (e.g. for Cortex M3)
SystemProfile = (0x53) // 'S' Application or real-time profile
};
// The following have a lot of common use cases
enum {
//ARMISAUse (=8), uleb128 and THUMBISAUse (=9), uleb128
Not_Allowed = 0,
Allowed = 1,
// FP_arch (=10), uleb128 (formerly Tag_VFP_arch = 10)
AllowFPv2 = 2, // v2 FP ISA permitted (implies use of the v1 FP ISA)
AllowFPv3A = 3, // v3 FP ISA permitted (implies use of the v2 FP ISA)
AllowFPv3B = 4, // v3 FP ISA permitted, but only D0-D15, S0-S31
AllowFPv4A = 5, // v4 FP ISA permitted (implies use of v3 FP ISA)
AllowFPv4B = 6, // v4 FP ISA was permitted, but only D0-D15, S0-S31
// Tag_WMMX_arch, (=11), uleb128
AllowThumb32 = 2, // 32-bit Thumb (implies 16-bit instructions)
// Tag_WMMX_arch, (=11), uleb128
AllowWMMXv1 = 2, // The user permitted this entity to use WMMX v2
// Tag_ABI_FP_denormal, (=20), uleb128
PreserveFPSign = 2, // sign when flushed-to-zero is preserved
// Tag_ABI_FP_number_model, (=23), uleb128
AllowRTABI = 2, // numbers, infinities, and one quiet NaN (see [RTABI])
AllowIEE754 = 3 // this code to use all the IEEE 754-defined FP encodings
};
}
#endif // __TARGET_ARMBUILDATTRS_H__

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46
test/Object/readobj-elf-arm-buildattrs.test Normal file
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@ -0,0 +1,46 @@
RUN: llvm-readobj -arm-buildattrs %p/Inputs/trivial-object-test.elf-arm \
RUN: | FileCheck %s -check-prefix=SMALL
RUN: llvm-readobj -arm-buildattrs %p/Inputs/arm-attributes.elf-arm \
RUN: | FileCheck %s -check-prefix=LARGE
SMALL: ARMBuildAttributes {
SMALL: Tag_CPU_name: Cortex-A8
SMALL: Tag_CPU_arch: 10
SMALL: Tag_ARM_ISA_use: 1
SMALL: Tag_THUMB_ISA_use: 2
SMALL: Tag_FP_arch: 3
SMALL: Tag_Advanced_SIMD_arch: 1
SMALL: Tag_ABI_FP_denormal: 1
SMALL: Tag_ABI_FP_exceptions: 1
SMALL: Tag_ABI_FP_number_model: 3
SMALL: Tag_ABI_align8_needed: 1
SMALL: Tag_ABI_align8_preserved: 1
SMALL: Tag_ABI_HardFP_use: 3
SMALL: Tag_ABI_VFP_args: 1
SMALL: Tag_DIV_use: 1
SMALL: Tag_Virtualization_use: 1
LARGE: ARMBuildAttributes {
LARGE: Tag_CPU_name: iwmmxt2
LARGE: Tag_CPU_arch: 4
LARGE: Tag_ARM_ISA_use: 1
LARGE: Tag_THUMB_ISA_use: 1
LARGE: Tag_WMMX_arch: 2
LARGE: Tag_Advanced_SIMD_arch: 1
LARGE: Tag_ABI_PCS_RW_data: 3
LARGE: Tag_ABI_PCS_GOT_use: 2
LARGE: Tag_ABI_PCS_wchar_t: 4
LARGE: Tag_ABI_FP_rounding: 1
LARGE: Tag_ABI_FP_denormal: 1
LARGE: Tag_ABI_FP_exceptions: 1
LARGE: Tag_ABI_FP_number_model: 3
LARGE: Tag_ABI_align8_needed: 1
LARGE: Tag_ABI_align8_preserved: 1
LARGE: Tag_ABI_enum_size: 2
LARGE: Tag_ABI_HardFP_use: 3
LARGE: Tag_ABI_VFP_args: 1
LARGE: Tag_ABI_optimization_goals: 1
LARGE: Tag_CPU_unaligned_access: 1
LARGE: Tag_FP_HP_extension: 1
LARGE: Tag_DIV_use: 1
LARGE: Tag_T2EE_use: 1

63
tools/llvm-readobj/ELFDumper.cpp
View File

@ -51,6 +51,7 @@ public:
virtual void printDynamicTable() LLVM_OVERRIDE;
virtual void printNeededLibraries() LLVM_OVERRIDE;
virtual void printProgramHeaders() LLVM_OVERRIDE;
virtual void printARMBuildAttributes() LLVM_OVERRIDE;
private:
typedef ELFObjectFile<ELFT> ELFO;
@ -858,3 +859,65 @@ void ELFDumper<ELFT>::printProgramHeaders() {
W.printNumber("Alignment", PI->p_align);
}
}
#define LLVM_READOBJ_ARMATTR_NUMCASE(X) case ARMBuildAttrs::X: \
W.printNumber(" Tag_" #X, BuildAttrs.Tag_##X); \
break; \
#define LLVM_READOBJ_ARMATTR_STRCASE(X) case ARMBuildAttrs::X: \
W.printString(" Tag_" #X, BuildAttrs.Tag_##X); \
break; \
template<class ELFT>
void ELFDumper<ELFT>::printARMBuildAttributes() {
if (Obj->getArch() != Triple::arm || !Obj->hasARMBuildAttributes())
return;
ARMBuildAttrs::ARMGenericBuildAttrInfo BuildAttrs;
SmallVector<unsigned, 16> AttrsRead;
error_code EC = Obj->readARMBuildAttributes(BuildAttrs, AttrsRead);
if (error(EC))
return;
DictScope D(W, "ARMBuildAttributes");
for (SmallVector<unsigned, 16>::iterator I = AttrsRead.begin(),
E = AttrsRead.end(); I != E; ++I) {
switch (*I) {
LLVM_READOBJ_ARMATTR_STRCASE(CPU_name)
LLVM_READOBJ_ARMATTR_STRCASE(CPU_raw_name)
LLVM_READOBJ_ARMATTR_NUMCASE(CPU_arch)
LLVM_READOBJ_ARMATTR_NUMCASE(CPU_arch_profile)
LLVM_READOBJ_ARMATTR_NUMCASE(ARM_ISA_use)
LLVM_READOBJ_ARMATTR_NUMCASE(THUMB_ISA_use)
LLVM_READOBJ_ARMATTR_NUMCASE(FP_arch)
LLVM_READOBJ_ARMATTR_NUMCASE(WMMX_arch)
LLVM_READOBJ_ARMATTR_NUMCASE(Advanced_SIMD_arch)
LLVM_READOBJ_ARMATTR_NUMCASE(PCS_config)
LLVM_READOBJ_ARMATTR_NUMCASE(ABI_PCS_R9_use)
LLVM_READOBJ_ARMATTR_NUMCASE(ABI_PCS_RW_data)
LLVM_READOBJ_ARMATTR_NUMCASE(ABI_PCS_RO_data)
LLVM_READOBJ_ARMATTR_NUMCASE(ABI_PCS_GOT_use)
LLVM_READOBJ_ARMATTR_NUMCASE(ABI_PCS_wchar_t)
LLVM_READOBJ_ARMATTR_NUMCASE(ABI_FP_rounding)
LLVM_READOBJ_ARMATTR_NUMCASE(ABI_FP_denormal)
LLVM_READOBJ_ARMATTR_NUMCASE(ABI_FP_exceptions)
LLVM_READOBJ_ARMATTR_NUMCASE(ABI_FP_user_exceptions)
LLVM_READOBJ_ARMATTR_NUMCASE(ABI_FP_number_model)
LLVM_READOBJ_ARMATTR_NUMCASE(ABI_align8_needed)
LLVM_READOBJ_ARMATTR_NUMCASE(ABI_align8_preserved)
LLVM_READOBJ_ARMATTR_NUMCASE(ABI_enum_size)
LLVM_READOBJ_ARMATTR_NUMCASE(ABI_HardFP_use)
LLVM_READOBJ_ARMATTR_NUMCASE(ABI_VFP_args)
LLVM_READOBJ_ARMATTR_NUMCASE(CPU_unaligned_access)
LLVM_READOBJ_ARMATTR_NUMCASE(FP_HP_extension)
LLVM_READOBJ_ARMATTR_NUMCASE(MPextension_use)
LLVM_READOBJ_ARMATTR_NUMCASE(DIV_use)
LLVM_READOBJ_ARMATTR_NUMCASE(T2EE_use)
LLVM_READOBJ_ARMATTR_NUMCASE(Virtualization_use)
LLVM_READOBJ_ARMATTR_NUMCASE(ABI_optimization_goals)
LLVM_READOBJ_ARMATTR_NUMCASE(ABI_FP_optimization_goals)
default:
break;
}
}
}

1
tools/llvm-readobj/ObjDumper.h
View File

@ -39,6 +39,7 @@ public:
virtual void printDynamicTable() { }
virtual void printNeededLibraries() { }
virtual void printProgramHeaders() { }
virtual void printARMBuildAttributes() { }
protected:
StreamWriter& W;

6
tools/llvm-readobj/llvm-readobj.cpp
View File

@ -128,6 +128,10 @@ namespace opts {
// -expand-relocs
cl::opt<bool> ExpandRelocs("expand-relocs",
cl::desc("Expand each shown relocation to multiple lines"));
// -arm-buildattrs
cl::opt<bool> ArmBuildAttrs("arm-buildattrs",
cl::desc("Display ARM ELF build attributes"));
} // namespace opts
namespace llvm {
@ -221,6 +225,8 @@ static void dumpObject(const ObjectFile *Obj) {
Dumper->printNeededLibraries();
if (opts::ProgramHeaders)
Dumper->printProgramHeaders();
if (opts::ArmBuildAttrs)
Dumper->printARMBuildAttributes();
}