[PATCH] D149444: [ARM] Allow codegen for Armv6m eXecute-Only (XO) sections

[Ties Stuij via Phabricator via cfe-commits]

stuij updated this revision to Diff 525079.
stuij added a comment.

addressed review comment


Repository:
  rG LLVM Github Monorepo

CHANGES SINCE LAST ACTION
  https://reviews.llvm.org/D149444/new/

https://reviews.llvm.org/D149444

Files:
  clang/lib/Driver/ToolChains/Arch/ARM.cpp
  clang/test/Driver/arm-execute-only.c
  llvm/lib/Target/ARM/ARMSubtarget.cpp


Index: llvm/lib/Target/ARM/ARMSubtarget.cpp
===================================================================
--- llvm/lib/Target/ARM/ARMSubtarget.cpp
+++ llvm/lib/Target/ARM/ARMSubtarget.cpp
@@ -187,10 +187,12 @@
   // Assert this for now to make the change obvious.
   assert(hasV6T2Ops() || !hasThumb2());
 
-  // Execute only support requires movt support
   if (genExecuteOnly()) {
-    NoMovt = false;
-    assert(hasV8MBaselineOps() && "Cannot generate execute-only code for this target");
+    // Execute only support for >= v8-M Baseline requires movt support
+    if (hasV8MBaselineOps())
+      NoMovt = false;
+    if (!hasV6MOps())
+      llvm_unreachable("Cannot generate execute-only code for this target");
   }
 
   // Keep a pointer to static instruction cost data for the specified CPU.
Index: clang/test/Driver/arm-execute-only.c
===================================================================
--- clang/test/Driver/arm-execute-only.c
+++ clang/test/Driver/arm-execute-only.c
@@ -1,6 +1,11 @@
-// RUN: not %clang -c -target thumbv6m-eabi -mexecute-only %s 2>&1 | \
+// RUN: %clang -c -target thumbv6m-eabi -mexecute-only %s 2>&1 | \
+// RUN:   FileCheck -allow-empty --check-prefix CHECK-THIS %s
+// CHECK-THIS-NOT: warning:
+// CHECK-THIS-NOT: error:
+
+// RUN: not %clang -c -target thumbv6-eabi -mexecute-only %s 2>&1 |    \
 // RUN:   FileCheck --check-prefix CHECK-EXECUTE-ONLY-NOT-SUPPORTED %s
-// CHECK-EXECUTE-ONLY-NOT-SUPPORTED: error: execute only is not supported for the thumbv6m sub-architecture
+// CHECK-EXECUTE-ONLY-NOT-SUPPORTED: error: execute only is not supported for the armv6 sub-architecture
 
 // RUN: not %clang -target armv8m.main-eabi -mexecute-only -mno-movt %s 2>&1 \
 // RUN:    | FileCheck %s -check-prefix CHECK-EXECUTE-ONLY-NO-MOVT
@@ -11,7 +16,7 @@
 // CHECK-NO-EXECUTE-ONLY-ASM: warning: argument unused during compilation: '-mexecute-only'
 
 // -mpure-code flag for GCC compatibility
-// RUN: not %clang -c -target thumbv6m-eabi -mpure-code %s 2>&1 | \
+// RUN: not %clang -c -target armv6-eabi -mpure-code %s 2>&1 | \
 // RUN:   FileCheck --check-prefix CHECK-EXECUTE-ONLY-NOT-SUPPORTED %s
 
 // RUN: not %clang -target armv8m.main-eabi -mpure-code -mno-movt %s 2>&1 \
Index: clang/lib/Driver/ToolChains/Arch/ARM.cpp
===================================================================
--- clang/lib/Driver/ToolChains/Arch/ARM.cpp
+++ clang/lib/Driver/ToolChains/Arch/ARM.cpp
@@ -790,7 +790,8 @@
     if (Arg *A = Args.getLastArg(options::OPT_mexecute_only, options::OPT_mno_execute_only)) {
       if (A->getOption().matches(options::OPT_mexecute_only)) {
         if (getARMSubArchVersionNumber(Triple) < 7 &&
-            llvm::ARM::parseArch(Triple.getArchName()) != llvm::ARM::ArchKind::ARMV6T2)
+            llvm::ARM::parseArch(Triple.getArchName()) != llvm::ARM::ArchKind::ARMV6T2 &&
+             llvm::ARM::parseArch(Triple.getArchName()) != llvm::ARM::ArchKind::ARMV6M)
               D.Diag(diag::err_target_unsupported_execute_only) << Triple.getArchName();
         else if (Arg *B = Args.getLastArg(options::OPT_mno_movt))
           D.Diag(diag::err_opt_not_valid_with_opt)


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