[llvm][readobj] Add AArch64 SME and SME2 note types

[DavidSpickett]

Summary

These are used to store new state added by the Scalable Matrix
Extension which is documented in
https://developer.arm.com/documentation/ddi0616/aa/.

The values match those defined by Linux, see:
https://github.com/torvalds/linux/blob/e62252bc55b6d4eddc6c2bdbf95a448180d6a08d/include/uapi/linux/elf.h#L435

The ZT register(s) are added by SME2 which is not yet publicly
documented but has support in LLVM and Linux already.

Also added descriptions for SVE and PAC_MASK notes since those
were missing.

[jhenderson]

LGTM, with one query.

llvm/tools/llvm-readobj/ELFDumper.cpp

5743

In the Linux elf.h, this is labelled as "ARM pointer authentication code masks" which doesn't mention registers. I don't know enough about this to know whether or not it's just missing the word though, so it's fine if nothing needs to change.

[DavidSpickett]

llvm/tools/llvm-readobj/ELFDumper.cpp

5743

That's a good point, they are not architectural registers but pseudo registers provided by Linux. I will fix this.

[DavidSpickett]

Correct description of PAC masks.

llvm/include/llvm/BinaryFormat/ELF.h

 //===- llvm/BinaryFormat/ELF.h - ELF constants and structures ---*- 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
 //
 //===----------------------------------------------------------------------===//
 //
enum : unsigned {
   NT_S390_GS_BC = 0x30c,
 
   NT_ARM_VFP = 0x400,
   NT_ARM_TLS = 0x401,
   NT_ARM_HW_BREAK = 0x402,
   NT_ARM_HW_WATCH = 0x403,
   NT_ARM_SVE = 0x405,
   NT_ARM_PAC_MASK = 0x406,
+  NT_ARM_SSVE = 0x40b,
+  NT_ARM_ZA = 0x40c,
+  NT_ARM_ZT = 0x40d,
 
   NT_FILE = 0x46494c45,
   NT_PRXFPREG = 0x46e62b7f,
   NT_SIGINFO = 0x53494749,
 };
 
 // LLVM-specific notes.
 enum {

llvm/lib/ObjectYAML/ELFYAML.cpp

 //===- ELFYAML.cpp - ELF YAMLIO implementation ----------------------------===//
 //
 // 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
 //
 //===----------------------------------------------------------------------===//
 //
#define ECase(X) IO.enumCase(Value, #X, ELF::X)
   ECase(NT_S390_GS_CB);
   ECase(NT_S390_GS_BC);
   ECase(NT_ARM_VFP);
   ECase(NT_ARM_TLS);
   ECase(NT_ARM_HW_BREAK);
   ECase(NT_ARM_HW_WATCH);
   ECase(NT_ARM_SVE);
   ECase(NT_ARM_PAC_MASK);
+  ECase(NT_ARM_SSVE);
+  ECase(NT_ARM_ZA);
+  ECase(NT_ARM_ZT);
   ECase(NT_FILE);
   ECase(NT_PRXFPREG);
   ECase(NT_SIGINFO);
   // LLVM-specific notes.
   ECase(NT_LLVM_HWASAN_GLOBALS);
   // GNU note types
   ECase(NT_GNU_ABI_TAG);
   ECase(NT_GNU_HWCAP);

llvm/test/tools/llvm-readobj/ELF/note-core.test

 # RUN: llvm-readelf --notes %t45.o | FileCheck %s --check-prefix=CHECK-GNU  -DDESC="NT_ARM_HW_BREAK (AArch hardware breakpoint registers)"
 # RUN: llvm-readobj --notes %t45.o | FileCheck %s --check-prefix=CHECK-LLVM -DDESC="NT_ARM_HW_BREAK (AArch hardware breakpoint registers)"
 
 ## Check ELF::NT_ARM_HW_WATCH.
 # RUN: yaml2obj %s -DTYPE=0x403 -o %t46.o
 # RUN: llvm-readelf --notes %t46.o | FileCheck %s --check-prefix=CHECK-GNU  -DDESC="NT_ARM_HW_WATCH (AArch hardware watchpoint registers)"
 # RUN: llvm-readobj --notes %t46.o | FileCheck %s --check-prefix=CHECK-LLVM -DDESC="NT_ARM_HW_WATCH (AArch hardware watchpoint registers)"
 
+## Check ELF::NT_ARM_SVE
+# RUN: yaml2obj %s -DTYPE=0x405 -o %t47.o
+# RUN: llvm-readelf --notes %t47.o | FileCheck %s --check-prefix=CHECK-GNU  -DDESC="NT_ARM_SVE (AArch64 SVE registers)"
+# RUN: llvm-readobj --notes %t47.o | FileCheck %s --check-prefix=CHECK-LLVM -DDESC="NT_ARM_SVE (AArch64 SVE registers)"
+
+## Check ELF::NT_ARM_PAC_MASK
+# RUN: yaml2obj %s -DTYPE=0x406 -o %t48.o
+# RUN: llvm-readelf --notes %t48.o | FileCheck %s --check-prefix=CHECK-GNU  -DDESC="NT_ARM_PAC_MASK (AArch64 Pointer Authentication code mask registers)"
+# RUN: llvm-readobj --notes %t48.o | FileCheck %s --check-prefix=CHECK-LLVM -DDESC="NT_ARM_PAC_MASK (AArch64 Pointer Authentication code mask registers)"
+
+## Check ELF::NT_ARM_SSVE
+# RUN: yaml2obj %s -DTYPE=0x40b -o %t49.o
+# RUN: llvm-readelf --notes %t49.o | FileCheck %s --check-prefix=CHECK-GNU  -DDESC="NT_ARM_SSVE (AArch64 Streaming SVE registers)"
+# RUN: llvm-readobj --notes %t49.o | FileCheck %s --check-prefix=CHECK-LLVM -DDESC="NT_ARM_SSVE (AArch64 Streaming SVE registers)"
+
+## Check ELF::NT_ARM_ZA
+# RUN: yaml2obj %s -DTYPE=0x40c -o %t50.o
+# RUN: llvm-readelf --notes %t50.o | FileCheck %s --check-prefix=CHECK-GNU  -DDESC="NT_ARM_ZA (AArch64 SME ZA registers)"
+# RUN: llvm-readobj --notes %t50.o | FileCheck %s --check-prefix=CHECK-LLVM -DDESC="NT_ARM_ZA (AArch64 SME ZA registers)"
+
+## Check ELF::NT_ARM_ZT
+# RUN: yaml2obj %s -DTYPE=0x40d -o %t51.o
+# RUN: llvm-readelf --notes %t51.o | FileCheck %s --check-prefix=CHECK-GNU  -DDESC="NT_ARM_ZT (AArch64 SME ZT registers)"
+# RUN: llvm-readobj --notes %t51.o | FileCheck %s --check-prefix=CHECK-LLVM -DDESC="NT_ARM_ZT (AArch64 SME ZT registers)"
+
 ## Check ELF::NT_FILE.
-# RUN: yaml2obj %s -DTYPE=0x46494c45 -o %t47.o
-# RUN: llvm-readelf --notes %t47.o | FileCheck %s --check-prefix=CHECK-GNU  -DDESC="NT_FILE (mapped files)"
-# RUN: llvm-readobj --notes %t47.o | FileCheck %s --check-prefix=CHECK-LLVM -DDESC="NT_FILE (mapped files)"
+# RUN: yaml2obj %s -DTYPE=0x46494c45 -o %t52.o
+# RUN: llvm-readelf --notes %t52.o | FileCheck %s --check-prefix=CHECK-GNU  -DDESC="NT_FILE (mapped files)"
+# RUN: llvm-readobj --notes %t52.o | FileCheck %s --check-prefix=CHECK-LLVM -DDESC="NT_FILE (mapped files)"
 
 ## Check ELF::NT_PRXFPREG.
-# RUN: yaml2obj %s -DTYPE=0x46e62b7f -o %t48.o
-# RUN: llvm-readelf --notes %t48.o | FileCheck %s --check-prefix=CHECK-GNU  -DDESC="NT_PRXFPREG (user_xfpregs structure)"
-# RUN: llvm-readobj --notes %t48.o | FileCheck %s --check-prefix=CHECK-LLVM -DDESC="NT_PRXFPREG (user_xfpregs structure)"
+# RUN: yaml2obj %s -DTYPE=0x46e62b7f -o %t53.o
+# RUN: llvm-readelf --notes %t53.o | FileCheck %s --check-prefix=CHECK-GNU  -DDESC="NT_PRXFPREG (user_xfpregs structure)"
+# RUN: llvm-readobj --notes %t53.o | FileCheck %s --check-prefix=CHECK-LLVM -DDESC="NT_PRXFPREG (user_xfpregs structure)"
 
 ## Check ELF::NT_SIGINFO.
-# RUN: yaml2obj %s -DTYPE=0x53494749 -o %t49.o
-# RUN: llvm-readelf --notes %t49.o | FileCheck %s --check-prefix=CHECK-GNU  -DDESC="NT_SIGINFO (siginfo_t data)"
-# RUN: llvm-readobj --notes %t49.o | FileCheck %s --check-prefix=CHECK-LLVM -DDESC="NT_SIGINFO (siginfo_t data)"
+# RUN: yaml2obj %s -DTYPE=0x53494749 -o %t54.o
+# RUN: llvm-readelf --notes %t54.o | FileCheck %s --check-prefix=CHECK-GNU  -DDESC="NT_SIGINFO (siginfo_t data)"
+# RUN: llvm-readobj --notes %t54.o | FileCheck %s --check-prefix=CHECK-LLVM -DDESC="NT_SIGINFO (siginfo_t data)"
 
 ## Check an arbitrary unknown type.
-# RUN: yaml2obj %s -DTYPE=0x12345678 -o %t50.o
-# RUN: llvm-readelf --notes %t50.o | FileCheck %s --check-prefix=CHECK-GNU  -DDESC="Unknown note type: (0x12345678)"
-# RUN: llvm-readobj --notes %t50.o | FileCheck %s --check-prefix=CHECK-LLVM -DDESC="Unknown (0x12345678)"
+# RUN: yaml2obj %s -DTYPE=0x12345678 -o %t55.o
+# RUN: llvm-readelf --notes %t55.o | FileCheck %s --check-prefix=CHECK-GNU  -DDESC="Unknown note type: (0x12345678)"
+# RUN: llvm-readobj --notes %t55.o | FileCheck %s --check-prefix=CHECK-LLVM -DDESC="Unknown (0x12345678)"
 
 # CHECK-GNU:      Owner Data size  Description
 # CHECK-GNU-NEXT: CORE  0x00000000 [[DESC]]
 # CHECK-GNU-EMPTY:
 
 # CHECK-LLVM:      Note {
 # CHECK-LLVM-NEXT:   Owner: CORE
 # CHECK-LLVM-NEXT:   Data size: 0x0

llvm/tools/llvm-readobj/ELFDumper.cpp

 //===- ELFDumper.cpp - ELF-specific dumper --------------------------------===//
 //
 // 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
 //
 //===----------------------------------------------------------------------===//
 ///
const NoteType CoreNoteTypes[] = {
      "NT_S390_GS_BC (s390 guarded-storage broadcast control)"},
 
     {ELF::NT_ARM_VFP, "NT_ARM_VFP (arm VFP registers)"},
     {ELF::NT_ARM_TLS, "NT_ARM_TLS (AArch TLS registers)"},
     {ELF::NT_ARM_HW_BREAK,
      "NT_ARM_HW_BREAK (AArch hardware breakpoint registers)"},
     {ELF::NT_ARM_HW_WATCH,
      "NT_ARM_HW_WATCH (AArch hardware watchpoint registers)"},
+    {ELF::NT_ARM_SVE, "NT_ARM_SVE (AArch64 SVE registers)"},
+    {ELF::NT_ARM_PAC_MASK,
+     "NT_ARM_PAC_MASK (AArch64 Pointer Authentication code mask registers)"},
+    {ELF::NT_ARM_SSVE, "NT_ARM_SSVE (AArch64 Streaming SVE registers)"},
+    {ELF::NT_ARM_ZA, "NT_ARM_ZA (AArch64 SME ZA registers)"},
+    {ELF::NT_ARM_ZT, "NT_ARM_ZT (AArch64 SME ZT registers)"},
 
     {ELF::NT_FILE, "NT_FILE (mapped files)"},
     {ELF::NT_PRXFPREG, "NT_PRXFPREG (user_xfpregs structure)"},
     {ELF::NT_SIGINFO, "NT_SIGINFO (siginfo_t data)"},
 };
 
 template <class ELFT>
 StringRef getNoteTypeName(const typename ELFT::Note &Note, unsigned ELFType) {