Teach libObject about some more ELF relocations. llvm-objdump -r now knows

every relocation in C++ hello world built with debug info.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@163271 91177308-0d34-0410-b5e6-96231b3b80d8

diff --git a/include/llvm/Object/ELF.h b/include/llvm/Object/ELF.h
index 4ee2f91..d672e96 100644 (file)
--- a/include/llvm/Object/ELF.h
+++ b/include/llvm/Object/ELF.h
@@ -1711,15 +1711,15 @@ error_code ELFObjectFile<target_endianness, is64Bits>
   int64_t addend = 0;
   uint16_t symbol_index = 0;
   switch (sec->sh_type) {
-    default :
+    default:
       return object_error::parse_failed;
-    case ELF::SHT_REL : {
+    case ELF::SHT_REL: {
       type = getRel(Rel)->getType();
       symbol_index = getRel(Rel)->getSymbol();
       // TODO: Read implicit addend from section data.
       break;
     }
-    case ELF::SHT_RELA : {
+    case ELF::SHT_RELA: {
       type = getRela(Rel)->getType();
       symbol_index = getRela(Rel)->getSymbol();
       addend = getRela(Rel)->r_addend;
@@ -1733,9 +1733,8 @@ error_code ELFObjectFile<target_endianness, is64Bits>
   switch (Header->e_machine) {
   case ELF::EM_X86_64:
     switch (type) {
-    case ELF::R_X86_64_32S:
-      res = symname;
-      break;
+    case ELF::R_X86_64_PC8:
+    case ELF::R_X86_64_PC16:
     case ELF::R_X86_64_PC32: {
         std::string fmtbuf;
         raw_string_ostream fmt(fmtbuf);
@@ -1744,6 +1743,18 @@ error_code ELFObjectFile<target_endianness, is64Bits>
         Result.append(fmtbuf.begin(), fmtbuf.end());
       }
       break;
+    case ELF::R_X86_64_8:
+    case ELF::R_X86_64_16:
+    case ELF::R_X86_64_32:
+    case ELF::R_X86_64_32S:
+    case ELF::R_X86_64_64: {
+        std::string fmtbuf;
+        raw_string_ostream fmt(fmtbuf);
+        fmt << symname << (addend < 0 ? "" : "+") << addend;
+        fmt.flush();
+        Result.append(fmtbuf.begin(), fmtbuf.end());
+      }
+      break;
     default:
       res = "Unknown";
     }

diff --git a/test/Object/objdump-relocations.test b/test/Object/objdump-relocations.test
index a394a23..6d35a26 100644 (file)
--- a/test/Object/objdump-relocations.test
+++ b/test/Object/objdump-relocations.test
@@ -9,6 +9,9 @@ RUN:              | FileCheck %s -check-prefix ELF-x86-64
 RUN: llvm-objdump -r %p/Inputs/trivial-object-test.elf-hexagon \
 RUN:              | FileCheck %s -check-prefix ELF-hexagon
 
+RUN: llvm-objdump -r %p/Inputs/relocations.elf-x86-64 \
+RUN:              | FileCheck %s -check-prefix ELF-complex-x86-64
+
 COFF-i386: .text
 COFF-i386: IMAGE_REL_I386_DIR32 L_.str
 COFF-i386: IMAGE_REL_I386_REL32 _puts
@@ -36,3 +39,13 @@ ELF-hexagon: R_HEX_HI16 puts
 ELF-hexagon: R_HEX_LO16 puts
 ELF-hexagon: R_HEX_B15_PCREL testf
 ELF-hexagon: R_HEX_B22_PCREL puts
+
+ELF-complex-x86-64: .text
+ELF-complex-x86-64-NEXT: R_X86_64_8 .data-4
+ELF-complex-x86-64-NEXT: R_X86_64_16 .data-4
+ELF-complex-x86-64-NEXT: R_X86_64_32 .data-4
+ELF-complex-x86-64-NEXT: R_X86_64_32S .data-4
+ELF-complex-x86-64-NEXT: R_X86_64_64 .data-4
+ELF-complex-x86-64-NEXT: R_X86_64_PC32 .data-4-P
+ELF-complex-x86-64-NEXT: R_X86_64_32 .data+0
+ELF-complex-x86-64-NEXT: R_X86_64_32 .data+4