Add support for reading ARM ELF build attributes.

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.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@181009 91177308-0d34-0410-b5e6-96231b3b80d8

2 files changed, 8 insertions, 139 deletions

diff --git a/lib/Target/ARM/ARMAsmPrinter.cpp b/lib/Target/ARM/ARMAsmPrinter.cpp
index 13ec208793..2d5dca5c04 100644
--- a/lib/Target/ARM/ARMAsmPrinter.cpp
+++ b/lib/Target/ARM/ARMAsmPrinter.cpp
@@ -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,
diff --git a/lib/Target/ARM/ARMBuildAttrs.h b/lib/Target/ARM/ARMBuildAttrs.h
deleted file mode 100644
index 11bd6a4a8d..0000000000
--- a/lib/Target/ARM/ARMBuildAttrs.h
+++ /dev/null
@@ -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__