Mips direct object exception handling regression

Revision 177141 caused a regression in all but
mips64 little endian. That is because none of the
other Mips targets had test cases checking the 
contents of the .eh_frame section. This patch fixes
both the llvm code and adds an assembler test case 
to include the current 4 flavors.

The test cases unfortunately rely on llvm-objdump. A
preferable method would be to use a pretty printer output
such as what readelf -wf <elf_file> would give.

I also changed the name of the test case to correct a typo.



git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@178506 91177308-0d34-0410-b5e6-96231b3b80d8

4 files changed, 128 insertions, 3 deletions

diff --git a/include/llvm/Object/ELF.h b/include/llvm/Object/ELF.h
index 7ab3643b79..b0d8663b7d 100644
--- a/include/llvm/Object/ELF.h
+++ b/include/llvm/Object/ELF.h
@@ -1634,6 +1634,63 @@ error_code ELFObjectFile<ELFT>::getRelocationTypeName(
       res = "Unknown";
     }
     break;
+  case ELF::EM_MIPS:
+    switch (type) {
+      LLVM_ELF_SWITCH_RELOC_TYPE_NAME(R_MIPS_NONE);
+      LLVM_ELF_SWITCH_RELOC_TYPE_NAME(R_MIPS_16);
+      LLVM_ELF_SWITCH_RELOC_TYPE_NAME(R_MIPS_32);
+      LLVM_ELF_SWITCH_RELOC_TYPE_NAME(R_MIPS_REL32);
+      LLVM_ELF_SWITCH_RELOC_TYPE_NAME(R_MIPS_26);
+      LLVM_ELF_SWITCH_RELOC_TYPE_NAME(R_MIPS_HI16);
+      LLVM_ELF_SWITCH_RELOC_TYPE_NAME(R_MIPS_LO16);
+      LLVM_ELF_SWITCH_RELOC_TYPE_NAME(R_MIPS_GPREL16);
+      LLVM_ELF_SWITCH_RELOC_TYPE_NAME(R_MIPS_LITERAL);
+      LLVM_ELF_SWITCH_RELOC_TYPE_NAME(R_MIPS_GOT16);
+      LLVM_ELF_SWITCH_RELOC_TYPE_NAME(R_MIPS_PC16);
+      LLVM_ELF_SWITCH_RELOC_TYPE_NAME(R_MIPS_CALL16);
+      LLVM_ELF_SWITCH_RELOC_TYPE_NAME(R_MIPS_GPREL32);
+      LLVM_ELF_SWITCH_RELOC_TYPE_NAME(R_MIPS_SHIFT5);
+      LLVM_ELF_SWITCH_RELOC_TYPE_NAME(R_MIPS_SHIFT6);
+      LLVM_ELF_SWITCH_RELOC_TYPE_NAME(R_MIPS_64);
+      LLVM_ELF_SWITCH_RELOC_TYPE_NAME(R_MIPS_GOT_DISP);
+      LLVM_ELF_SWITCH_RELOC_TYPE_NAME(R_MIPS_GOT_PAGE);
+      LLVM_ELF_SWITCH_RELOC_TYPE_NAME(R_MIPS_GOT_OFST);
+      LLVM_ELF_SWITCH_RELOC_TYPE_NAME(R_MIPS_GOT_HI16);
+      LLVM_ELF_SWITCH_RELOC_TYPE_NAME(R_MIPS_GOT_LO16);
+      LLVM_ELF_SWITCH_RELOC_TYPE_NAME(R_MIPS_SUB);
+      LLVM_ELF_SWITCH_RELOC_TYPE_NAME(R_MIPS_INSERT_A);
+      LLVM_ELF_SWITCH_RELOC_TYPE_NAME(R_MIPS_INSERT_B);
+      LLVM_ELF_SWITCH_RELOC_TYPE_NAME(R_MIPS_DELETE);
+      LLVM_ELF_SWITCH_RELOC_TYPE_NAME(R_MIPS_HIGHER);
+      LLVM_ELF_SWITCH_RELOC_TYPE_NAME(R_MIPS_HIGHEST);
+      LLVM_ELF_SWITCH_RELOC_TYPE_NAME(R_MIPS_CALL_HI16);
+      LLVM_ELF_SWITCH_RELOC_TYPE_NAME(R_MIPS_CALL_LO16);
+      LLVM_ELF_SWITCH_RELOC_TYPE_NAME(R_MIPS_SCN_DISP);
+      LLVM_ELF_SWITCH_RELOC_TYPE_NAME(R_MIPS_REL16);
+      LLVM_ELF_SWITCH_RELOC_TYPE_NAME(R_MIPS_ADD_IMMEDIATE);
+      LLVM_ELF_SWITCH_RELOC_TYPE_NAME(R_MIPS_PJUMP);
+      LLVM_ELF_SWITCH_RELOC_TYPE_NAME(R_MIPS_RELGOT);
+      LLVM_ELF_SWITCH_RELOC_TYPE_NAME(R_MIPS_JALR);
+      LLVM_ELF_SWITCH_RELOC_TYPE_NAME(R_MIPS_TLS_DTPMOD32);
+      LLVM_ELF_SWITCH_RELOC_TYPE_NAME(R_MIPS_TLS_DTPREL32);
+      LLVM_ELF_SWITCH_RELOC_TYPE_NAME(R_MIPS_TLS_DTPMOD64);
+      LLVM_ELF_SWITCH_RELOC_TYPE_NAME(R_MIPS_TLS_DTPREL64);
+      LLVM_ELF_SWITCH_RELOC_TYPE_NAME(R_MIPS_TLS_GD);
+      LLVM_ELF_SWITCH_RELOC_TYPE_NAME(R_MIPS_TLS_LDM);
+      LLVM_ELF_SWITCH_RELOC_TYPE_NAME(R_MIPS_TLS_DTPREL_HI16);
+      LLVM_ELF_SWITCH_RELOC_TYPE_NAME(R_MIPS_TLS_DTPREL_LO16);
+      LLVM_ELF_SWITCH_RELOC_TYPE_NAME(R_MIPS_TLS_GOTTPREL);
+      LLVM_ELF_SWITCH_RELOC_TYPE_NAME(R_MIPS_TLS_TPREL32);
+      LLVM_ELF_SWITCH_RELOC_TYPE_NAME(R_MIPS_TLS_TPREL64);
+      LLVM_ELF_SWITCH_RELOC_TYPE_NAME(R_MIPS_TLS_TPREL_HI16);
+      LLVM_ELF_SWITCH_RELOC_TYPE_NAME(R_MIPS_TLS_TPREL_LO16);
+      LLVM_ELF_SWITCH_RELOC_TYPE_NAME(R_MIPS_GLOB_DAT);
+      LLVM_ELF_SWITCH_RELOC_TYPE_NAME(R_MIPS_COPY);
+      LLVM_ELF_SWITCH_RELOC_TYPE_NAME(R_MIPS_JUMP_SLOT);
+    default:
+      res = "Unknown";
+    }
+    break;
   case ELF::EM_AARCH64:
     switch (type) {
       LLVM_ELF_SWITCH_RELOC_TYPE_NAME(R_AARCH64_NONE);
diff --git a/lib/MC/MCObjectFileInfo.cpp b/lib/MC/MCObjectFileInfo.cpp
index bafa002e3d..0d32ad40e8 100644
--- a/lib/MC/MCObjectFileInfo.cpp
+++ b/lib/MC/MCObjectFileInfo.cpp
@@ -223,9 +223,10 @@ void MCObjectFileInfo::InitMachOMCObjectFileInfo(Triple T) {
 }
 
 void MCObjectFileInfo::InitELFMCObjectFileInfo(Triple T) {
-  // FIXME: Check this. Mips64el is using the base values, which is most likely
-  // incorrect.
-  if (T.getArch() != Triple::mips64el)
+  if (T.getArch() != Triple::mips &&
+      T.getArch() != Triple::mipsel &&
+      T.getArch() != Triple::mips64 &&
+      T.getArch() != Triple::mips64el )
     FDECFIEncoding = dwarf::DW_EH_PE_pcrel | dwarf::DW_EH_PE_sdata4;
 
   if (T.getArch() == Triple::x86) {
diff --git a/test/MC/Mips/eh-frame.s b/test/MC/Mips/eh-frame.s
new file mode 100644
index 0000000000..56278b8b99
--- /dev/null
+++ b/test/MC/Mips/eh-frame.s
@@ -0,0 +1,46 @@
+// Assembler generated object test.
+// This tests .eh_frame descriptors minimally.
+
+// What we really need is a prettyprinter output check not unlike what
+// gnu's readobj generates instead of checking the bits for .eh_frame.
+
+// RUN: llvm-mc -filetype=obj -mcpu=mips32r2 -triple mipsel-unknown-linux -arch=mipsel %s -o - \
+// RUN: | llvm-objdump -s - | FileCheck -check-prefix=CHECK-LEO32 %s
+
+// RUN: llvm-mc -filetype=obj -mcpu=mips32r2 -triple mips-unknown-linux -arch=mips %s -o - \
+// RUN: | llvm-objdump -s - | FileCheck -check-prefix=CHECK-BEO32 %s
+
+// RUN: llvm-mc -filetype=obj -mcpu=mips64r2 -mattr=n64 -arch=mips64el %s -o - \
+// RUN: | llvm-objdump -s - | FileCheck -check-prefix=CHECK-LE64 %s
+
+// RUN: llvm-mc -filetype=obj -mcpu=mips64r2 -mattr=n64 -arch=mips64 %s -o - \
+// RUN: | llvm-objdump -s - | FileCheck -check-prefix=CHECK-BE64 %s
+
+// O32 little endian
+// CHECK-LEO32: Contents of section .eh_frame:
+// CHECK-LEO32-NEXT: 0000 10000000 00000000 017a5200 017c1f01  .........zR..|..
+// CHECK-LEO32-NEXT: 0010 000c1d00 10000000 18000000 00000000  ................
+// CHECK-LEO32-NEXT: 0020 00000000 00000000                    ........
+
+// O32 big endian
+// CHECK-BEO32: Contents of section .eh_frame:
+// CHECK-BEO32-NEXT 0000 00000010 00000000 017a5200 017c1f01  .........zR..|..
+// CHECK-BEO32-NEXT 0010 000c1d00 00000010 00000018 00000000  ................
+// CHECK-BEO32-NEXT 0020 00000000 00000000                    ........
+
+// N64 little endian
+// CHECK-LE64: Contents of section .eh_frame:
+// CHECK-LE64-NEXT: 0000 10000000 00000000 017a5200 01781f01  .........zR..x..
+// CHECK-LE64-NEXT: 0010 000c1d00 18000000 18000000 00000000  ................
+// CHECK-LE64-NEXT: 0020 00000000 00000000 00000000 00000000  ................
+
+// N64 big endian
+// CHECK-BE64: Contents of section .eh_frame:
+// CHECK-BE64-NEXT: 0000 00000010 00000000 017a5200 01781f01  .........zR..x..
+// CHECK-BE64-NEXT: 0010 000c1d00 00000018 00000018 00000000  ................
+// CHECK-BE64-NEXT: 0020 00000000 00000000 00000000 00000000  ................
+
+func:
+	.cfi_startproc
+	.cfi_endproc
+
diff --git a/test/MC/Mips/fde-reloc.s b/test/MC/Mips/fde-reloc.s
new file mode 100644
index 0000000000..2db5d0b638
--- /dev/null
+++ b/test/MC/Mips/fde-reloc.s
@@ -0,0 +1,21 @@
+// This just tests that a relocation of the specified type shows up as the first
+// relocation in the relocation section for .eh_frame when produced by the
+// assembler.
+
+// RUN: llvm-mc -filetype=obj %s -o - -triple mips-unknown-unknown | \
+// RUN: llvm-objdump -r - | FileCheck --check-prefix=MIPS32 %s
+
+// RUN: llvm-mc -filetype=obj %s -o - -triple mips64-unknown-unknown | \
+// RUN: llvm-objdump -r - | FileCheck --check-prefix=MIPS64 %s
+
+// PR15448
+
+func:
+	.cfi_startproc
+	.cfi_endproc
+
+// MIPS32: RELOCATION RECORDS FOR [.eh_frame]:
+// MIPS32-NEXT: R_MIPS_32
+
+// MIPS64: RELOCATION RECORDS FOR [.eh_frame]:
+// MIPS64-NEXT: R_MIPS_64