This patch fixes a Mips specific bug where

we need to generate a N64 compound relocation
R_MIPS_GPREL_32/R_MIPS_64/R_MIPS_NONE.

The bug was exposed by the SingleSourcetest case
DuffsDevice.c.

Contributer: Jack Carter

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@172496 91177308-0d34-0410-b5e6-96231b3b80d8

diff --git a/lib/Target/Mips/MCTargetDesc/MipsELFObjectWriter.cpp b/lib/Target/Mips/MCTargetDesc/MipsELFObjectWriter.cpp
index f82e203c23caf44439880f8c3a0b4d242aed563a..7afb77ecb5fa0b5fdab02660c18aba2d98eb2025 100644 (file)
--- a/lib/Target/Mips/MCTargetDesc/MipsELFObjectWriter.cpp
+++ b/lib/Target/Mips/MCTargetDesc/MipsELFObjectWriter.cpp
@@ -108,7 +108,13 @@ unsigned MipsELFObjectWriter::GetRelocType(const MCValue &Target,
     Type = ELF::R_MIPS_64;
     break;
   case FK_GPRel_4:
-    Type = ELF::R_MIPS_GPREL32;
+    if (isN64()) {
+      Type = setRType((unsigned)ELF::R_MIPS_GPREL32, Type);
+      Type = setRType2((unsigned)ELF::R_MIPS_64, Type);
+      Type = setRType3((unsigned)ELF::R_MIPS_NONE, Type);
+    }
+    else
+      Type = ELF::R_MIPS_GPREL32;
     break;
   case Mips::fixup_Mips_GPREL16:
     Type = ELF::R_MIPS_GPREL16;

diff --git a/test/MC/Mips/elf-gprel-32-64.ll b/test/MC/Mips/elf-gprel-32-64.ll
new file mode 100644 (file)
index 0000000..b946822
--- /dev/null
+++ b/test/MC/Mips/elf-gprel-32-64.ll
@@ -0,0 +1,37 @@
+; RUN: llc -filetype=obj -march=mips64el -mcpu=mips64 %s -o - \
+; RUN: | elf-dump --dump-section-data \
+; RUN: | FileCheck %s
+
+define i32 @test(i32 %c) nounwind {
+entry:
+  switch i32 %c, label %sw.default [
+    i32 0, label %sw.bb
+    i32 1, label %sw.bb2
+    i32 2, label %sw.bb5
+    i32 3, label %sw.bb8
+  ]
+
+sw.bb:
+  br label %return
+sw.bb2:
+  br label %return
+sw.bb5:
+  br label %return
+sw.bb8:
+  br label %return
+sw.default:
+  br label %return
+
+return:
+  %retval.0 = phi i32 [ -1, %sw.default ], [ 7, %sw.bb8 ], [ 2, %sw.bb5 ], [ 3, %sw.bb2 ], [ 1, %sw.bb ]
+  ret i32 %retval.0
+}
+
+; Check that the appropriate relocations were created.
+
+; R_MIPS_GPREL32/R_MIPS_64/R_MIPS_NONE
+; CHECK: (('sh_name', 0x{{[a-z0-9]+}}) # '.rela.rodata'
+; CHECK:      ('r_type3', 0x00)
+; CHECK-NEXT: ('r_type2', 0x12)
+; CHECK-NEXT: ('r_type', 0x0c)
+