[AArch64] fix bug #55005 handle DW_CFA_GNU_NegateRAState

GCC on AArch64 uses DW_CFA_GNU_NegateRAState for return address signing.

Differential Revision: https://reviews.llvm.org/D142572

(cherry picked from commit 9921197)

Author: Sebastian Pop

bolt/lib/Core/Exceptions.cpp

@@ -626,18 +626,25 @@ bool CFIReaderWriter::fillCFIInfoFor(BinaryFunction &Function) const {
         errs() << "BOLT-WARNING: DW_CFA_MIPS_advance_loc unimplemented\n";
       return false;
     case DW_CFA_GNU_window_save:
+      // DW_CFA_GNU_window_save and DW_CFA_GNU_NegateRAState just use the same
+      // id but mean different things. The latter is used in AArch64.
+      if (Function.getBinaryContext().isAArch64()) {
+        Function.addCFIInstruction(
+            Offset, MCCFIInstruction::createNegateRAState(nullptr));
+        break;
+      }
+      if (opts::Verbosity >= 1)
+        errs() << "BOLT-WARNING: DW_CFA_GNU_window_save unimplemented\n";
+      return false;
     case DW_CFA_lo_user:
     case DW_CFA_hi_user:
-      if (opts::Verbosity >= 1) {
-        errs() << "BOLT-WARNING: DW_CFA_GNU_* and DW_CFA_*_user "
-                  "unimplemented\n";
-      }
+      if (opts::Verbosity >= 1)
+        errs() << "BOLT-WARNING: DW_CFA_*_user unimplemented\n";
       return false;
     default:
-      if (opts::Verbosity >= 1) {
+      if (opts::Verbosity >= 1)
         errs() << "BOLT-WARNING: Unrecognized CFI instruction: " << Instr.Opcode
                << '\n';
-      }
       return false;
     }
 

bolt/test/AArch64/Inputs/dw_cfa_gnu_window_save.yaml

@@ -0,0 +1,62 @@
+--- !ELF
+FileHeader:
+  Class:           ELFCLASS64
+  Data:            ELFDATA2LSB
+  Type:            ET_EXEC
+  Machine:         EM_AARCH64
+  Entry:           0x4100C0
+ProgramHeaders:
+  - Type:            PT_LOAD
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+    LastSec:         .fini
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+    Type:            SHT_PROGBITS
+    Flags:           [ SHF_ALLOC ]
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+    AddressAlign:    0x8
+    Content:         1000000000000000017A520004781E011B0C1F0010000000180000003C00FFFF3C0000000041071E140000002C0000006800FFFF08000000000000000000000010000000440000007000FFFF300000000000000010000000580000008C00FFFF3C00000000000000240000006C000000B400FFFF3800000000412D410E209D049E0342930248DEDDD30E00412D0000001400000094000000C400FFFF08000000000000000000000010000000AC00000068FFFEFF080000000000000000000000
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+    Section:         .text
+    Value:           0x410080
+  - Name:            _ITM_deregisterTMCloneTable
+    Binding:         STB_WEAK
+  - Name:            _ITM_registerTMCloneTable
+    Binding:         STB_WEAK
+...

bolt/test/AArch64/dw_cfa_gnu_window_save.test

@@ -0,0 +1,8 @@
+# Check that llvm-bolt can handle DW_CFA_GNU_window_save on AArch64.
+
+RUN: yaml2obj %p/Inputs/dw_cfa_gnu_window_save.yaml &> %t.exe
+RUN: llvm-bolt %t.exe -o %t.bolt 2>&1 | FileCheck %s
+
+CHECK-NOT: paciasp
+CHECK-NOT: autiasp
+CHECK-NOT: ERROR: unable to fill CFI.