ARM IAS: support .personalityindex

The .personalityindex directive is equivalent to the .personality directive with
the ARM EABI personality with the specific index (0, 1, 2).  Both of these
directives indicate personality routines, so enhance the personality directive
handling to take into account personalityindex.

Bonus fix: flush the UnwindContext at the beginning of a new function.

Thanks to Logan Chien for additional tests!

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@199706 91177308-0d34-0410-b5e6-96231b3b80d8

diff --git a/include/llvm/MC/MCStreamer.h b/include/llvm/MC/MCStreamer.h
index 419e0068033c48a4ffc7a0e1fdef0405449b87bd..946baf1b7c4d8915b753f2f9d333637d0ffd9c91 100644 (file)
--- a/include/llvm/MC/MCStreamer.h
+++ b/include/llvm/MC/MCStreamer.h
@@ -85,6 +85,7 @@ public:
   virtual void emitFnEnd() = 0;
   virtual void emitCantUnwind() = 0;
   virtual void emitPersonality(const MCSymbol *Personality) = 0;
+  virtual void emitPersonalityIndex(unsigned Index) = 0;
   virtual void emitHandlerData() = 0;
   virtual void emitSetFP(unsigned FpReg, unsigned SpReg,
                          int64_t Offset = 0) = 0;

diff --git a/lib/Target/ARM/AsmParser/ARMAsmParser.cpp b/lib/Target/ARM/AsmParser/ARMAsmParser.cpp
index 1a3df51acd99b837c9f4b3fe6ea47a1387edd07c..0a1ba9105a7b93205f0ccb9465431600bc001ef8 100644 (file)
--- a/lib/Target/ARM/AsmParser/ARMAsmParser.cpp
+++ b/lib/Target/ARM/AsmParser/ARMAsmParser.cpp
@@ -40,6 +40,7 @@
 #include "llvm/MC/MCSymbol.h"
 #include "llvm/MC/MCTargetAsmParser.h"
 #include "llvm/Support/ARMBuildAttributes.h"
+#include "llvm/Support/ARMEHABI.h"
 #include "llvm/Support/Debug.h"
 #include "llvm/Support/ELF.h"
 #include "llvm/Support/MathExtras.h"
@@ -121,6 +122,7 @@ class UnwindContext {
   Locs FnStartLocs;
   Locs CantUnwindLocs;
   Locs PersonalityLocs;
+  Locs PersonalityIndexLocs;
   Locs HandlerDataLocs;
   int FPReg;
 
@@ -130,12 +132,15 @@ public:
   bool hasFnStart() const { return !FnStartLocs.empty(); }
   bool cantUnwind() const { return !CantUnwindLocs.empty(); }
   bool hasHandlerData() const { return !HandlerDataLocs.empty(); }
-  bool hasPersonality() const { return !PersonalityLocs.empty(); }
+  bool hasPersonality() const {
+    return !(PersonalityLocs.empty() && PersonalityIndexLocs.empty());
+  }
 
   void recordFnStart(SMLoc L) { FnStartLocs.push_back(L); }
   void recordCantUnwind(SMLoc L) { CantUnwindLocs.push_back(L); }
   void recordPersonality(SMLoc L) { PersonalityLocs.push_back(L); }
   void recordHandlerData(SMLoc L) { HandlerDataLocs.push_back(L); }
+  void recordPersonalityIndex(SMLoc L) { PersonalityIndexLocs.push_back(L); }
 
   void saveFPReg(int Reg) { FPReg = Reg; }
   int getFPReg() const { return FPReg; }
@@ -157,8 +162,18 @@ public:
   }
   void emitPersonalityLocNotes() const {
     for (Locs::const_iterator PI = PersonalityLocs.begin(),
-                              PE = PersonalityLocs.end(); PI != PE; ++PI)
-      Parser.Note(*PI, ".personality was specified here");
+                              PE = PersonalityLocs.end(),
+                              PII = PersonalityIndexLocs.begin(),
+                              PIE = PersonalityIndexLocs.end();
+         PI != PE || PII != PIE;) {
+      if (PI != PE && (PII == PIE || PI->getPointer() < PII->getPointer()))
+        Parser.Note(*PI++, ".personality was specified here");
+      else if (PII != PIE && (PI == PE || PII->getPointer() < PI->getPointer()))
+        Parser.Note(*PII++, ".personalityindex was specified here");
+      else
+        llvm_unreachable(".personality and .personalityindex cannot be "
+                         "at the same location");
+    }
   }
 
   void reset() {
@@ -166,6 +181,7 @@ public:
     CantUnwindLocs = Locs();
     PersonalityLocs = Locs();
     HandlerDataLocs = Locs();
+    PersonalityIndexLocs = Locs();
     FPReg = -1;
   }
 };
@@ -278,6 +294,7 @@ class ARMAsmParser : public MCTargetAsmParser {
   bool parseDirectiveInst(SMLoc L, char Suffix = '\0');
   bool parseDirectiveLtorg(SMLoc L);
   bool parseDirectiveEven(SMLoc L);
+  bool parseDirectivePersonalityIndex(SMLoc L);
 
   StringRef splitMnemonic(StringRef Mnemonic, unsigned &PredicationCode,
                           bool &CarrySetting, unsigned &ProcessorIMod,
@@ -8062,6 +8079,8 @@ bool ARMAsmParser::ParseDirective(AsmToken DirectiveID) {
     return parseDirectiveLtorg(DirectiveID.getLoc());
   else if (IDVal == ".even")
     return parseDirectiveEven(DirectiveID.getLoc());
+  else if (IDVal == ".personalityindex")
+    return parseDirectivePersonalityIndex(DirectiveID.getLoc());
   return true;
 }
 
@@ -8454,6 +8473,9 @@ bool ARMAsmParser::parseDirectiveFnStart(SMLoc L) {
     return false;
   }
 
+  // Reset the unwind directives parser state
+  UC.reset();
+
   getTargetStreamer().emitFnStart();
 
   UC.recordFnStart(L);
@@ -8504,6 +8526,8 @@ bool ARMAsmParser::parseDirectiveCantUnwind(SMLoc L) {
 /// parseDirectivePersonality
 ///  ::= .personality name
 bool ARMAsmParser::parseDirectivePersonality(SMLoc L) {
+  bool HasExistingPersonality = UC.hasPersonality();
+
   UC.recordPersonality(L);
 
   // Check the ordering of unwind directives
@@ -8521,6 +8545,12 @@ bool ARMAsmParser::parseDirectivePersonality(SMLoc L) {
     UC.emitHandlerDataLocNotes();
     return false;
   }
+  if (HasExistingPersonality) {
+    Parser.eatToEndOfStatement();
+    Error(L, "multiple personality directives");
+    UC.emitPersonalityLocNotes();
+    return false;
+  }
 
   // Parse the name of the personality routine
   if (Parser.getTok().isNot(AsmToken::Identifier)) {
@@ -8830,6 +8860,61 @@ bool ARMAsmParser::parseDirectiveEven(SMLoc L) {
   return false;
 }
 
+/// parseDirectivePersonalityIndex
+///   ::= .personalityindex index
+bool ARMAsmParser::parseDirectivePersonalityIndex(SMLoc L) {
+  bool HasExistingPersonality = UC.hasPersonality();
+
+  UC.recordPersonalityIndex(L);
+
+  if (!UC.hasFnStart()) {
+    Parser.eatToEndOfStatement();
+    Error(L, ".fnstart must precede .personalityindex directive");
+    return false;
+  }
+  if (UC.cantUnwind()) {
+    Parser.eatToEndOfStatement();
+    Error(L, ".personalityindex cannot be used with .cantunwind");
+    UC.emitCantUnwindLocNotes();
+    return false;
+  }
+  if (UC.hasHandlerData()) {
+    Parser.eatToEndOfStatement();
+    Error(L, ".personalityindex must precede .handlerdata directive");
+    UC.emitHandlerDataLocNotes();
+    return false;
+  }
+  if (HasExistingPersonality) {
+    Parser.eatToEndOfStatement();
+    Error(L, "multiple personality directives");
+    UC.emitPersonalityLocNotes();
+    return false;
+  }
+
+  const MCExpr *IndexExpression;
+  SMLoc IndexLoc = Parser.getTok().getLoc();
+  if (Parser.parseExpression(IndexExpression)) {
+    Parser.eatToEndOfStatement();
+    return false;
+  }
+
+  const MCConstantExpr *CE = dyn_cast<MCConstantExpr>(IndexExpression);
+  if (!CE) {
+    Parser.eatToEndOfStatement();
+    Error(IndexLoc, "index must be a constant number");
+    return false;
+  }
+  if (CE->getValue() < 0 ||
+      CE->getValue() >= ARM::EHABI::NUM_PERSONALITY_INDEX) {
+    Parser.eatToEndOfStatement();
+    Error(IndexLoc, "personality routine index should be in range [0-3]");
+    return false;
+  }
+
+  getTargetStreamer().emitPersonalityIndex(CE->getValue());
+  return false;
+}
+
 /// Force static initialization.
 extern "C" void LLVMInitializeARMAsmParser() {
   RegisterMCAsmParser<ARMAsmParser> X(TheARMTarget);

diff --git a/lib/Target/ARM/MCTargetDesc/ARMELFStreamer.cpp b/lib/Target/ARM/MCTargetDesc/ARMELFStreamer.cpp
index 4c079262943ac899b39fc295fb4edb205467ad25..82543a45f24d824aac8c971a1a2f685b788efd5e 100644 (file)
--- a/lib/Target/ARM/MCTargetDesc/ARMELFStreamer.cpp
+++ b/lib/Target/ARM/MCTargetDesc/ARMELFStreamer.cpp
@@ -117,6 +117,7 @@ class ARMTargetAsmStreamer : public ARMTargetStreamer {
   virtual void emitFnEnd();
   virtual void emitCantUnwind();
   virtual void emitPersonality(const MCSymbol *Personality);
+  virtual void emitPersonalityIndex(unsigned Index);
   virtual void emitHandlerData();
   virtual void emitSetFP(unsigned FpReg, unsigned SpReg, int64_t Offset = 0);
   virtual void emitPad(int64_t Offset);
@@ -148,6 +149,9 @@ void ARMTargetAsmStreamer::emitCantUnwind() { OS << "\t.cantunwind\n"; }
 void ARMTargetAsmStreamer::emitPersonality(const MCSymbol *Personality) {
   OS << "\t.personality " << Personality->getName() << '\n';
 }
+void ARMTargetAsmStreamer::emitPersonalityIndex(unsigned Index) {
+  OS << "\t.personalityindex " << Index << '\n';
+}
 void ARMTargetAsmStreamer::emitHandlerData() { OS << "\t.handlerdata\n"; }
 void ARMTargetAsmStreamer::emitSetFP(unsigned FpReg, unsigned SpReg,
                                      int64_t Offset) {
@@ -357,6 +361,7 @@ private:
   virtual void emitFnEnd();
   virtual void emitCantUnwind();
   virtual void emitPersonality(const MCSymbol *Personality);
+  virtual void emitPersonalityIndex(unsigned Index);
   virtual void emitHandlerData();
   virtual void emitSetFP(unsigned FpReg, unsigned SpReg, int64_t Offset = 0);
   virtual void emitPad(int64_t Offset);
@@ -415,6 +420,7 @@ public:
   void emitFnEnd();
   void emitCantUnwind();
   void emitPersonality(const MCSymbol *Per);
+  void emitPersonalityIndex(unsigned index);
   void emitHandlerData();
   void emitSetFP(unsigned NewFpReg, unsigned NewSpReg, int64_t Offset = 0);
   void emitPad(int64_t Offset);
@@ -614,6 +620,9 @@ void ARMTargetELFStreamer::emitCantUnwind() { getStreamer().emitCantUnwind(); }
 void ARMTargetELFStreamer::emitPersonality(const MCSymbol *Personality) {
   getStreamer().emitPersonality(Personality);
 }
+void ARMTargetELFStreamer::emitPersonalityIndex(unsigned Index) {
+  getStreamer().emitPersonalityIndex(Index);
+}
 void ARMTargetELFStreamer::emitHandlerData() {
   getStreamer().emitHandlerData();
 }
@@ -1135,6 +1144,11 @@ void ARMELFStreamer::emitPersonality(const MCSymbol *Per) {
   UnwindOpAsm.setPersonality(Per);
 }
 
+void ARMELFStreamer::emitPersonalityIndex(unsigned Index) {
+  assert(Index < ARM::EHABI::NUM_PERSONALITY_INDEX && "invalid index");
+  PersonalityIndex = Index;
+}
+
 void ARMELFStreamer::emitSetFP(unsigned NewFPReg, unsigned NewSPReg,
                                int64_t Offset) {
   assert((NewSPReg == ARM::SP || NewSPReg == FPReg) &&

diff --git a/lib/Target/ARM/MCTargetDesc/ARMUnwindOpAsm.cpp b/lib/Target/ARM/MCTargetDesc/ARMUnwindOpAsm.cpp
index 8cba45acf304e3ffcad877f435eb2527b0ac183d..593fe349b1d4f699083e3fb0d1f32dccea60a747 100644 (file)
--- a/lib/Target/ARM/MCTargetDesc/ARMUnwindOpAsm.cpp
+++ b/lib/Target/ARM/MCTargetDesc/ARMUnwindOpAsm.cpp
@@ -194,14 +194,17 @@ void UnwindOpcodeAssembler::Finalize(unsigned &PersonalityIndex,
     Result.resize(RoundUpSize);
     OpStreamer.EmitSize(RoundUpSize);
   } else {
-    if (Ops.size() <= 3) {
+    // If no personalityindex is specified, select ane
+    if (PersonalityIndex == ARM::EHABI::NUM_PERSONALITY_INDEX)
+      PersonalityIndex = (Ops.size() <= 3) ? ARM::EHABI::AEABI_UNWIND_CPP_PR0
+                                           : ARM::EHABI::AEABI_UNWIND_CPP_PR1;
+    if (PersonalityIndex == ARM::EHABI::AEABI_UNWIND_CPP_PR0) {
       // __aeabi_unwind_cpp_pr0: [ 0x80 , OP1 , OP2 , OP3 ]
-      PersonalityIndex = ARM::EHABI::AEABI_UNWIND_CPP_PR0;
+      assert(Ops.size() <= 3 && "too many opcodes for __aeabi_unwind_cpp_pr0");
       Result.resize(4);
       OpStreamer.EmitPersonalityIndex(PersonalityIndex);
     } else {
-      // __aeabi_unwind_cpp_pr1: [ 0x81 , SIZE , OP1 , OP2 , ... ]
-      PersonalityIndex = ARM::EHABI::AEABI_UNWIND_CPP_PR1;
+      // __aeabi_unwind_cpp_pr{1,2}: [ {0x81,0x82} , SIZE , OP1 , OP2 , ... ]
       size_t TotalSize = Ops.size() + 2;
       size_t RoundUpSize = (TotalSize + 3) / 4 * 4;
       Result.resize(RoundUpSize);

diff --git a/test/MC/ARM/eh-directive-personalityindex-diagnostics.s b/test/MC/ARM/eh-directive-personalityindex-diagnostics.s
new file mode 100644 (file)
index 0000000..2dc2c80
--- /dev/null
+++ b/test/MC/ARM/eh-directive-personalityindex-diagnostics.s
@@ -0,0 +1,122 @@
+@ RUN: not llvm-mc -triple armv7-linux-eabi -filetype asm -o /dev/null %s 2>&1  \
+@ RUN:   | FileCheck %s
+
+       .syntax unified
+       .thumb
+
+       .global function
+       .type function,%function
+       .thumb_func
+function:
+       .personalityindex 0
+
+@ CHECK: error: .fnstart must precede .personalityindex directive
+@ CHECK:       .personalityindex 0
+@ CHECK:        ^
+
+       .global ununwindable
+       .type ununwindable,%function
+       .thumb_func
+ununwindable:
+       .fnstart
+       .cantunwind
+       .personalityindex 0
+       .fnend
+
+@ CHECK: error: .personalityindex cannot be used with .cantunwind
+@ CHECK:       .personalityindex 0
+@ CHECK:        ^
+@ CHECK: note: .cantunwind was specified here
+@ CHECK:       .cantunwind
+@ CHECK:        ^
+
+       .global nodata
+       .type nodata,%function
+       .thumb_func
+nodata:
+       .fnstart
+       .handlerdata
+       .personalityindex 0
+       .fnend
+
+@ CHECK: error: .personalityindex must precede .handlerdata directive
+@ CHECK:       .personalityindex 0
+@ CHECK:        ^
+@ CHECK: note: .handlerdata was specified here
+@ CHECK:       .handlerdata
+@ CHECK:        ^
+
+       .global multiple_personality
+       .type multiple_personality,%function
+       .thumb_func
+multiple_personality:
+       .fnstart
+       .personality __aeabi_personality_pr0
+       .personalityindex 0
+       .fnend
+
+@ CHECK: error: multiple personality directives
+@ CHECK:       .personalityindex 0
+@ CHECK:        ^
+@ CHECK: note: .personality was specified here
+@ CHECK:       .personality __aeabi_personality_pr0
+@ CHECK:        ^
+@ CHECK: note: .personalityindex was specified here
+@ CHECK:       .personalityindex 0
+@ CHECK:       ^
+
+       .global multiple_personality_indicies
+       .type multiple_personality_indicies,%function
+       .thumb_func
+multiple_personality_indicies:
+       .fnstart
+       .personalityindex 0
+       .personalityindex 1
+       .fnend
+
+@ CHECK: error: multiple personality directives
+@ CHECK:       .personalityindex 1
+@ CHECK:        ^
+@ CHECK: note: .personalityindex was specified here
+@ CHECK:       .personalityindex 0
+@ CHECK:        ^
+@ CHECK: note: .personalityindex was specified here
+@ CHECK:       .personalityindex 1
+@ CHECK:        ^
+
+       .global invalid_expression
+       .type invalid_expression,%function
+       .thumb_func
+invalid_expression:
+       .fnstart
+       .personalityindex <expression>
+       .fnend
+
+@ CHECK: error: unknown token in expression
+@ CHECK:       .personalityindex <expression>
+@ CHECK:                          ^
+
+       .global nonconstant_expression
+       .type nonconstant_expression,%function
+       .thumb_func
+nonconstant_expression:
+       .fnstart
+       .personalityindex nonconstant_expression
+       .fnend
+
+@ CHECK: error: index must be a constant number
+@ CHECK:       .personalityindex nonconstant_expression
+@ CHECK:                          ^
+
+       .global bad_index
+       .type bad_index,%function
+       .thumb_func
+bad_index:
+       .fnstart
+       .personalityindex 42
+       .fnend
+
+@ CHECK: error: personality routine index should be in range [0-3]
+@ CHECK:       .personalityindex 42
+@ CHECK:                          ^
+

diff --git a/test/MC/ARM/eh-directive-personalityindex.s b/test/MC/ARM/eh-directive-personalityindex.s
new file mode 100644 (file)
index 0000000..5517227
--- /dev/null
+++ b/test/MC/ARM/eh-directive-personalityindex.s
@@ -0,0 +1,202 @@
+@ RUN: llvm-mc -triple armv7-linux-eabi -filetype obj -o - %s \
+@ RUN:   | llvm-readobj -s -sd -sr | FileCheck %s
+
+       .syntax unified
+       .thumb
+
+
+       .section .pr0
+
+       .global pr0
+       .type pr0,%function
+       .thumb_func
+pr0:
+       .fnstart
+       .personalityindex 0
+       bx lr
+       .fnend
+
+@ CHECK: Section {
+@ CHECK:   Name: .ARM.exidx.pr0
+@ CHECK:   SectionData (
+@ CHECK:     0000: 00000000 B0B0B080
+@ CHECK:   )
+@ CHECK: }
+
+@ CHECK: Section {
+@ CHECK:   Name: .rel.ARM.exidx.pr0
+@ CHECK:   Relocations [
+@ CHECK:     0x0 R_ARM_PREL31 .pr0 0x0
+@ CHECK:     0x0 R_ARM_NONE __aeabi_unwind_cpp_pr0 0x0
+@ CHECK:   ]
+@ CHECK: }
+
+       .section .pr0.nontrivial
+
+       .global pr0_nontrivial
+       .type pr0_nontrivial,%function
+       .thumb_func
+pr0_nontrivial:
+       .fnstart
+       .personalityindex 0
+       .pad #0x10
+       sub sp, sp, #0x10
+       add sp, sp, #0x10
+       bx lr
+       .fnend
+
+@ CHECK: Section {
+@ CHECK:   Name: .ARM.exidx.pr0.nontrivial
+@ CHECK:   SectionData (
+@ CHECK:     0000: 00000000 B0B00380
+@ CHECK:   )
+@ CHECK: }
+
+@ CHECK: Section {
+@ CHECK:   Name: .rel.ARM.exidx.pr0.nontrivial
+@ CHECK:   Relocations [
+@ CHECK:     0x0 R_ARM_PREL31 .pr0.nontrivial 0x0
+@ CHECK:     0x0 R_ARM_NONE __aeabi_unwind_cpp_pr0 0x0
+@ CHECK:   ]
+@ CHECK: }
+
+       .section .pr1
+
+       .global pr1
+       .type pr1,%function
+       .thumb_func
+pr1:
+       .fnstart
+       .personalityindex 1
+       bx lr
+       .fnend
+
+@ CHECK: Section {
+@ CHECK:   Name: .ARM.extab.pr1
+@ CHECK:   SectionData (
+@ CHECK:     0000: B0B00081 00000000
+@ CHECK:   )
+@ CHECK: }
+
+@ CHECK: Section {
+@ CHECK:   Name: .ARM.exidx.pr1
+@ CHECK:   SectionData (
+@ CHECK:     0000: 00000000 00000000
+@ CHECK:   )
+@ CHECK: }
+
+@ CHECK: Section {
+@ CHECK:   Name: .rel.ARM.exidx.pr1
+@ CHECK:   Relocations [
+@ CHECK:     0x0 R_ARM_PREL31 .pr1 0x0
+@ CHECK:     0x0 R_ARM_NONE __aeabi_unwind_cpp_pr1 0x0
+@ CHECK:     0x4 R_ARM_PREL31 .ARM.extab.pr1 0x0
+@ CHECK:   ]
+@ CHECK: }
+
+       .section .pr1.nontrivial
+
+       .global pr1_nontrivial
+       .type pr1_nontrivial,%function
+       .thumb_func
+pr1_nontrivial:
+       .fnstart
+       .personalityindex 1
+       .pad #0x10
+       sub sp, sp, #0x10
+       add sp, sp, #0x10
+       bx lr
+       .fnend
+
+@ CHECK: Section {
+@ CHECK:   Name: .ARM.extab.pr1.nontrivial
+@ CHECK:   SectionData (
+@ CHECK:     0000: B0030081 00000000
+@ CHECK:   )
+@ CHECK: }
+
+@ CHECK: Section {
+@ CHECK:   Name: .ARM.exidx.pr1.nontrivial
+@ CHECK:   SectionData (
+@ CHECK:     0000: 00000000 00000000
+@ CHECK:   )
+@ CHECK: }
+
+@ CHECK: Section {
+@ CHECK:   Name: .rel.ARM.exidx.pr1.nontrivial
+@ CHECK:   Relocations [
+@ CHECK:     0x0 R_ARM_PREL31 .pr1.nontrivial 0x0
+@ CHECK:     0x0 R_ARM_NONE __aeabi_unwind_cpp_pr1 0x0
+@ CHECK:     0x4 R_ARM_PREL31 .ARM.extab.pr1.nontrivial 0x0
+@ CHECK:   ]
+@ CHECK: }
+
+       .section .pr2
+
+       .global pr2
+       .type pr2,%function
+       .thumb_func
+pr2:
+       .fnstart
+       .personalityindex 2
+       bx lr
+       .fnend
+
+@ CHECK: Section {
+@ CHECK:   Name: .ARM.extab.pr2
+@ CHECK:   SectionData (
+@ CHECK:     0000: B0B00082 00000000
+@ CHECK:   )
+@ CHECK: }
+
+@ CHECK: Section {
+@ CHECK:   Name: .ARM.exidx.pr2
+@ CHECK:   SectionData (
+@ CHECK:     0000: 00000000 00000000
+@ CHECK:   )
+@ CHECK: }
+
+@ CHECK: Section {
+@ CHECK:   Name: .rel.ARM.exidx.pr2
+@ CHECK:   Relocations [
+@ CHECK:     0x0 R_ARM_PREL31 .pr2 0x0
+@ CHECK:     0x0 R_ARM_NONE __aeabi_unwind_cpp_pr2 0x0
+@ CHECK:     0x4 R_ARM_PREL31 .ARM.extab.pr2 0x0
+@ CHECK:   ]
+@ CHECK: }
+
+       .section .pr2.nontrivial
+       .type pr2_nontrivial,%function
+       .thumb_func
+pr2_nontrivial:
+       .fnstart
+       .personalityindex 2
+       .pad #0x10
+       sub sp, sp, #0x10
+       add sp, sp, #0x10
+       bx lr
+       .fnend
+
+@ CHECK: Section {
+@ CHECK:   Name: .ARM.extab.pr2.nontrivial
+@ CHECK:   SectionData (
+@ CHECK:     0000: B0030082 00000000
+@ CHECK:   )
+@ CHECK: }
+
+@ CHECK: Section {
+@ CHECK:   Name: .ARM.exidx.pr2.nontrivial
+@ CHECK:   SectionData (
+@ CHECK:     0000: 00000000 00000000
+@ CHECK:   )
+@ CHECK: }
+
+@ CHECK: Section {
+@ CHECK:   Name: .rel.ARM.exidx.pr2.nontrivial
+@ CHECK:   Relocations [
+@ CHECK:     0x0 R_ARM_PREL31 .pr2.nontrivial 0x0
+@ CHECK:     0x0 R_ARM_NONE __aeabi_unwind_cpp_pr2 0x0
+@ CHECK:     0x4 R_ARM_PREL31 .ARM.extab.pr2.nontrivial 0x0
+@ CHECK:   ]
+@ CHECK: }
+