[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

diff --git a/bolt/lib/Core/Exceptions.cpp b/bolt/lib/Core/Exceptions.cpp
index f8eabcf..34e7454 100644 (file)
--- a/bolt/lib/Core/Exceptions.cpp
+++ b/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;
     }
 

diff --git a/bolt/test/AArch64/Inputs/dw_cfa_gnu_window_save.yaml b/bolt/test/AArch64/Inputs/dw_cfa_gnu_window_save.yaml
new file mode 100644 (file)
index 0000000..faa32e0
--- /dev/null
+++ b/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
+    Flags:           [ PF_X, PF_R ]
+    FirstSec:        .init
+    LastSec:         .fini
+    VAddr:           0x410000
+    Align:           0x10000
+Sections:
+  - Name:            .init
+    Type:            SHT_PROGBITS
+    Flags:           [ SHF_ALLOC, SHF_EXECINSTR ]
+    Address:         0x410000
+    AddressAlign:    0x4
+    Offset:          0x10000
+    Content:         3F2303D5FD7BBFA9FD0300913F000094FD7BC1A8BF2303D5C0035FD6
+  - Name:            .plt
+    Type:            SHT_PROGBITS
+    Flags:           [ SHF_ALLOC, SHF_EXECINSTR ]
+    Address:         0x410020
+    AddressAlign:    0x10
+    Content:         F07BBFA9700100F011FE47F910E23F9120021FD61F2003D51F2003D51F2003D590010090110240F91002009120021FD690010090110640F91022009120021FD690010090110A40F91042009120021FD6
+  - Name:            .text
+    Type:            SHT_PROGBITS
+    Flags:           [ SHF_ALLOC, SHF_EXECINSTR ]
+    Address:         0x410080
+    AddressAlign:    0x40
+    Content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
+  - Name:            .fini
+    Type:            SHT_PROGBITS
+    Flags:           [ SHF_ALLOC, SHF_EXECINSTR ]
+    Address:         0x4101CC
+    AddressAlign:    0x4
+    Content:         3F2303D5FD7BBFA9FD030091FD7BC1A8BF2303D5C0035FD6
+  - Name:            .eh_frame
+    Type:            SHT_PROGBITS
+    Flags:           [ SHF_ALLOC ]
+    Address:         0x420068
+    AddressAlign:    0x8
+    Content:         1000000000000000017A520004781E011B0C1F0010000000180000003C00FFFF3C0000000041071E140000002C0000006800FFFF08000000000000000000000010000000440000007000FFFF300000000000000010000000580000008C00FFFF3C00000000000000240000006C000000B400FFFF3800000000412D410E209D049E0342930248DEDDD30E00412D0000001400000094000000C400FFFF08000000000000000000000010000000AC00000068FFFEFF080000000000000000000000
+  - Name:            .rela.text
+    Type:            SHT_RELA
+    Flags:           [ SHF_INFO_LINK ]
+    Link:            .symtab
+    AddressAlign:    0x8
+    Info:            .text
+Symbols:
+  - Name:            .text
+    Type:            STT_SECTION
+    Section:         .text
+    Value:           0x410080
+  - Name:            _ITM_deregisterTMCloneTable
+    Binding:         STB_WEAK
+  - Name:            _ITM_registerTMCloneTable
+    Binding:         STB_WEAK
+...

diff --git a/bolt/test/AArch64/dw_cfa_gnu_window_save.test b/bolt/test/AArch64/dw_cfa_gnu_window_save.test
new file mode 100644 (file)
index 0000000..2e044b3
--- /dev/null
+++ b/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.