From: Daniel Dunbar <daniel@zuster.org>
Date: Tue, 9 Mar 2010 21:27:58 +0000 (+0000)
Subject: MC/Mach-O: For PCrel relocations, we need to compensate for the PCrel adjustment... 
X-Git-Url: http://demsky.eecs.uci.edu/git/?a=commitdiff_plain;h=f3a066f7c3ef4e729c92929acab352a93f8d7563;p=oota-llvm.git

MC/Mach-O: For PCrel relocations, we need to compensate for the PCrel adjustment when determining if we need a scattered relocation.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@98082 91177308-0d34-0410-b5e6-96231b3b80d8
---

diff --git a/lib/MC/MCAssembler.cpp b/lib/MC/MCAssembler.cpp
index b3e8114b422..cf02cc15c5a 100644
--- a/lib/MC/MCAssembler.cpp
+++ b/lib/MC/MCAssembler.cpp
@@ -504,15 +504,21 @@ public:
                              MCAsmFixup &Fixup,
                              DenseMap<const MCSymbol*,MCSymbolData*> &SymbolMap,
                              std::vector<MachRelocationEntry> &Relocs) {
+    unsigned IsPCRel = isFixupKindPCRel(Fixup.Kind);
+    unsigned Log2Size = getFixupKindLog2Size(Fixup.Kind);
+
     MCValue Target;
     if (!Fixup.Value->EvaluateAsRelocatable(Target))
       llvm_report_error("expected relocatable expression");
 
-    // If this is a difference or a local symbol plus an offset, then we need a
-    // scattered relocation entry.
+    // If this is a difference or a defined symbol plus an offset, then we need
+    // a scattered relocation entry.
+    uint32_t Offset = Target.getConstant();
+    if (IsPCRel)
+      Offset += 1 << Log2Size;
     if (Target.getSymB() ||
         (Target.getSymA() && !Target.getSymA()->isUndefined() &&
-         Target.getConstant()))
+         Offset))
       return ComputeScatteredRelocationInfo(Asm, Fragment, Fixup, Target,
                                             SymbolMap, Relocs);
 
@@ -520,8 +526,6 @@ public:
     uint32_t Address = Fragment.getOffset() + Fixup.Offset;
     uint32_t Value = 0;
     unsigned Index = 0;
-    unsigned IsPCRel = isFixupKindPCRel(Fixup.Kind);
-    unsigned Log2Size = getFixupKindLog2Size(Fixup.Kind);
     unsigned IsExtern = 0;
     unsigned Type = 0;
 
diff --git a/test/MC/MachO/reloc-pcrel.s b/test/MC/MachO/reloc-pcrel.s
new file mode 100644
index 00000000000..fff7cc0ada0
--- /dev/null
+++ b/test/MC/MachO/reloc-pcrel.s
@@ -0,0 +1,62 @@
+// RUN: llvm-mc -triple i386-apple-darwin9 %s -filetype=obj -o - | macho-dump | FileCheck %s
+
+// CHECK: # Relocation 0
+// CHECK: (('word-0', 0xe4000045),
+// CHECK:  ('word-1', 0x4)),
+// CHECK: # Relocation 1
+// CHECK: (('word-0', 0xe1000000),
+// CHECK:  ('word-1', 0x6)),
+// CHECK: # Relocation 2
+// CHECK: (('word-0', 0x40),
+// CHECK:  ('word-1', 0xd000002)),
+// CHECK: # Relocation 3
+// CHECK: (('word-0', 0x3b),
+// CHECK:  ('word-1', 0xd000002)),
+// CHECK: # Relocation 4
+// CHECK: (('word-0', 0x36),
+// CHECK:  ('word-1', 0xd000002)),
+// CHECK: # Relocation 5
+// CHECK: (('word-0', 0xe0000031),
+// CHECK:  ('word-1', 0x4)),
+// CHECK: # Relocation 6
+// CHECK: (('word-0', 0xe000002c),
+// CHECK:  ('word-1', 0x4)),
+// CHECK: # Relocation 7
+// CHECK: (('word-0', 0x27),
+// CHECK:  ('word-1', 0x5000001)),
+// CHECK: # Relocation 8
+// CHECK: (('word-0', 0xe0000022),
+// CHECK:  ('word-1', 0x2)),
+// CHECK: # Relocation 9
+// CHECK: (('word-0', 0xe000001d),
+// CHECK:  ('word-1', 0x2)),
+// CHECK: # Relocation 10
+// CHECK: (('word-0', 0x18),
+// CHECK:  ('word-1', 0x5000001)),
+// CHECK-NEXT: ])
+
+        xorl %eax,%eax
+        
+        .globl _a
+_a:
+        xorl %eax,%eax
+_b:
+        xorl %eax,%eax
+L0:
+        xorl %eax,%eax
+L1:     
+
+        call L0
+        call L0 - 1
+        call L0 + 1
+        call _a
+        call _a - 1
+        call _a + 1
+        call _b
+        call _b - 1
+        call _b + 1
+        call _c
+        call _c - 1
+        call _c + 1
+//        call _a - L0
+        call _b - L0