[lld] [llvm] [LLD][ELF][AArch64] Add support for SHF_AARCH64_PURECODE ELF section flag (3/3) (PR #125689)

[Csanád Hajdú via llvm-commits]

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@@ -2844,6 +2848,36 @@ static void readSecurityNotes(Ctx &ctx) {
     ctx.arg.andFeatures &= ~GNU_PROPERTY_AARCH64_FEATURE_1_GCS;
 }
 
+static void checkExecuteOnly(Ctx &ctx) {
+  if (ctx.arg.emachine != EM_AARCH64)
+    return;
+
+  auto reportUnless = [&](StringRef config, bool cond) -> ELFSyncStream {
+    if (cond)
+      return {ctx, DiagLevel::None};
+    if (config == "error")
+      return {ctx, DiagLevel::Err};
+    if (config == "warning")
+      return {ctx, DiagLevel::Warn};
+    return {ctx, DiagLevel::None};
+  };
+
+  for (ELFFileBase *file : ctx.objectFiles) {
+    for (InputSectionBase *section : file->getSections()) {
+      if (!(section && section->flags & SHF_EXECINSTR))
+        continue;
+
+      OutputSection *outputSection = section->getOutputSection();
+      if (outputSection && outputSection->name == ".text") {
+        reportUnless(ctx.arg.zExecuteOnlyReport,
+                     section->flags & SHF_AARCH64_PURECODE)
+            << file << ": -z execute-only-report: section " << section->name
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Il-Capitano wrote:

I didn't know about that, thanks for pointing it out.

https://github.com/llvm/llvm-project/pull/125689