[readelf] arm: Support for new pacbti unwind opcode 0xb5.

This patch adds readelf support for decoding the exception
table opcode "0xb5", which indicates to use effective vsp
as modifier for PAC validation as defined by EHABI
(https://github.com/ARM-software/abi-aa/releases/download/2022Q3/ehabi32.pdf
Section 10.3).

binutils/ChangeLog:

2022-11-07  Srinath Parvathaneni  <srinath.parvathaneni@arm.com>

        * readelf.c (decode_arm_unwind_bytecode): Add entry to decode opcode 0xb5.

diff --git a/binutils/readelf.c b/binutils/readelf.c
index 4d8e540b39b1a7089bbb31026ddbc597e3621731..c8323539a21f3d3ba757e364c06c3dc0e6e7fade 100644 (file)
--- a/binutils/readelf.c
+++ b/binutils/readelf.c
@@ -9916,6 +9916,8 @@ decode_arm_unwind_bytecode (Filedata *                 filedata,
        }
       else if (op == 0xb4)
        printf (_("     pop {ra_auth_code}"));
+      else if (op == 0xb5)
+       printf (_("     vsp as modifier for PAC validation"));
       else if ((op & 0xf8) == 0xb8 || (op & 0xf8) == 0xd0)
        {
          unsigned int count = op & 0x07;