From 53625db42578d6c1b48b96e8b312bcbcb581ad15 Mon Sep 17 00:00:00 2001
From: Tim Haines <thaines.astro@gmail.com>
Date: Fri, 17 Nov 2023 16:20:08 -0600
Subject: [PATCH] Add missing flagc from RFLAGS

FLAGC is the lower bit of the I/O Permission Level field.
---
 common/h/registers/x86_64_regs.h    | 2 ++
 common/src/registers/MachRegister.C | 1 +
 dataflowAPI/src/SymEvalPolicy.C     | 2 ++
 3 files changed, 5 insertions(+)

diff --git a/common/h/registers/x86_64_regs.h b/common/h/registers/x86_64_regs.h
index 7d6ff54a45..95335299f4 100644
--- a/common/h/registers/x86_64_regs.h
+++ b/common/h/registers/x86_64_regs.h
@@ -129,6 +129,7 @@ namespace Dyninst { namespace x86_64 {
   const signed int IF    = x86::IF;    // Interrupt Enable Flag
   const signed int DF    = x86::DF;    // Direction Flag
   const signed int OF    = x86::OF;    // Overflow Flag
+  const signed int FLAGC = x86::FLAGC; // I/O Privilege Level (bits 12 and 13)
   const signed int NT    = x86::NT;    // Nested Task
   const signed int RF    = x86::RF;    // Resume Flag
 
@@ -216,6 +217,7 @@ namespace Dyninst { namespace x86_64 {
   DEF_REGISTER(       if_,     IF |   BIT |  FLAG | Arch_x86_64, "x86_64");
   DEF_REGISTER(        df,     DF |   BIT |  FLAG | Arch_x86_64, "x86_64");
   DEF_REGISTER(        of,     OF |   BIT |  FLAG | Arch_x86_64, "x86_64");
+  DEF_REGISTER(     flagc,  FLAGC |   BIT |  FLAG | Arch_x86_64, "x86_64");
   DEF_REGISTER(       nt_,     NT |   BIT |  FLAG | Arch_x86_64, "x86_64");
   DEF_REGISTER(        rf,     RF |   BIT |  FLAG | Arch_x86_64, "x86_64");
   DEF_REGISTER(        ds, BASEDS |  FULL |   SEG | Arch_x86_64, "x86_64");
diff --git a/common/src/registers/MachRegister.C b/common/src/registers/MachRegister.C
index a0908c5a59..d5c43e7a41 100644
--- a/common/src/registers/MachRegister.C
+++ b/common/src/registers/MachRegister.C
@@ -809,6 +809,7 @@ namespace Dyninst {
               case x86_64::IF: n = x86_flag_if; break;
               case x86_64::DF: n = x86_flag_df; break;
               case x86_64::OF: n = x86_flag_of; break;
+              case x86_64::FLAGC: n = x86_flag_iopl0; break;
               default:
                 c = -1;
                 return;
diff --git a/dataflowAPI/src/SymEvalPolicy.C b/dataflowAPI/src/SymEvalPolicy.C
index 22a6db1b7b..f6d3c75792 100644
--- a/dataflowAPI/src/SymEvalPolicy.C
+++ b/dataflowAPI/src/SymEvalPolicy.C
@@ -474,6 +474,8 @@ Absloc SymEvalPolicy_64::convert(X86Flag f)
          return Absloc(x86_64::df);
       case x86_flag_of:
          return Absloc(x86_64::of);
+      case x86_flag_iopl0:
+         return Absloc(x86_64::FLAGC);
       case x86_flag_nt:
          return Absloc(x86_64::nt_);
       default: