[llvm] [AArch64][Windows] Add llvm-readobj support for ec_context unwind opcode (PR #69515)

[Billy Laws via llvm-commits]

https://github.com/bylaws updated https://github.com/llvm/llvm-project/pull/69515

>From f2f05e7b87ef3d92db6fda45ab669df28f4ad67e Mon Sep 17 00:00:00 2001
From: Billy Laws <blaws05 at gmail.com>
Date: Wed, 18 Oct 2023 21:32:36 +0100
Subject: [PATCH] [AArch64][Windows] Add llvm-readobj support for ec_context
 unwind opcode

---
 llvm/tools/llvm-readobj/ARMWinEHPrinter.cpp | 8 ++++++++
 llvm/tools/llvm-readobj/ARMWinEHPrinter.h   | 2 ++
 2 files changed, 10 insertions(+)

diff --git a/llvm/tools/llvm-readobj/ARMWinEHPrinter.cpp b/llvm/tools/llvm-readobj/ARMWinEHPrinter.cpp
index ef77d4b2fd224bd..cf5c77cf107c36f 100644
--- a/llvm/tools/llvm-readobj/ARMWinEHPrinter.cpp
+++ b/llvm/tools/llvm-readobj/ARMWinEHPrinter.cpp
@@ -171,6 +171,7 @@ const Decoder::RingEntry Decoder::Ring64[] = {
     {0xff, 0xe8, 1, &Decoder::opcode_trap_frame},
     {0xff, 0xe9, 1, &Decoder::opcode_machine_frame},
     {0xff, 0xea, 1, &Decoder::opcode_context},
+    {0xff, 0xeb, 1, &Decoder::opcode_ec_context},
     {0xff, 0xec, 1, &Decoder::opcode_clear_unwound_to_call},
     {0xff, 0xfc, 1, &Decoder::opcode_pac_sign_lr},
 };
@@ -969,6 +970,13 @@ bool Decoder::opcode_context(const uint8_t *OC, unsigned &Offset,
   return false;
 }
 
+bool Decoder::opcode_ec_context(const uint8_t *OC, unsigned &Offset,
+                                unsigned Length, bool Prologue) {
+  SW.startLine() << format("0x%02x                ; EC context\n", OC[Offset]);
+  ++Offset;
+  return false;
+}
+
 bool Decoder::opcode_clear_unwound_to_call(const uint8_t *OC, unsigned &Offset,
                                            unsigned Length, bool Prologue) {
   SW.startLine() << format("0x%02x                ; clear unwound to call\n",
diff --git a/llvm/tools/llvm-readobj/ARMWinEHPrinter.h b/llvm/tools/llvm-readobj/ARMWinEHPrinter.h
index 0ffebe5834c480b..fa5b31dd87b4b43 100644
--- a/llvm/tools/llvm-readobj/ARMWinEHPrinter.h
+++ b/llvm/tools/llvm-readobj/ARMWinEHPrinter.h
@@ -129,6 +129,8 @@ class Decoder {
                             unsigned Length, bool Prologue);
   bool opcode_context(const uint8_t *Opcodes, unsigned &Offset, unsigned Length,
                       bool Prologue);
+  bool opcode_ec_context(const uint8_t *Opcodes, unsigned &Offset,
+                         unsigned Length, bool Prologue);
   bool opcode_clear_unwound_to_call(const uint8_t *Opcodes, unsigned &Offset,
                                     unsigned Length, bool Prologue);
   bool opcode_pac_sign_lr(const uint8_t *Opcodes, unsigned &Offset,