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Handle the case of the magical _GLOBAL_OFFSET_TABLE_ showing up in a

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symbol difference. This matches gas behavior and fixes PR11513.

We still don't handle _GLOBAL_OFFSET_TABLE_ in data sections.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@146238 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Rafael Espindola 2011-12-09 03:03:58 +00:00
parent 85f5a1ae39
commit 1d5969d839
2 changed files with 24 additions and 7 deletions
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11
lib/MC/ELFObjectWriter.cpp
View File

@ -1742,6 +1742,15 @@ unsigned X86ELFObjectWriter::GetRelocType(const MCValue &Target,
}
} else {
if (IsPCRel) {
switch ((unsigned)Fixup.getKind()) {
default: llvm_unreachable("invalid fixup kind!");
case X86::reloc_global_offset_table:
Type = ELF::R_386_GOTPC;
break;
case FK_PCRel_4:
case FK_Data_4:
switch (Modifier) {
default:
llvm_unreachable("Unimplemented");
@ -1752,6 +1761,8 @@ unsigned X86ELFObjectWriter::GetRelocType(const MCValue &Target,
Type = ELF::R_386_PLT32;
break;
}
break;
}
} else {
switch ((unsigned)Fixup.getKind()) {
default: llvm_unreachable("invalid fixup kind!");

6
test/MC/ELF/relocation-386.s
View File

@ -160,6 +160,11 @@
// CHECK-NEXT: ('r_sym', 0x00000d)
// CHECK-NEXT: ('r_type', 0x21)
// CHECK-NEXT: ),
// Relocation 25 (_GLOBAL_OFFSET_TABLE_-bar2) is of type R_386_GOTPC.
// CHECK-NEXT: Relocation 25
// CHECK-NEXT: (('r_offset', 0x00000094)
// CHECK-NEXT: ('r_sym', 0x00000b)
// CHECK-NEXT: ('r_type', 0x0a)
// Section 4 is bss
// CHECK: # Section 4
@ -225,6 +230,7 @@ bar2:
movl zed@DTPOFF(%eax), %eax
pushl $bar
addl foo@GOTTPOFF(%edx), %eax
subl _GLOBAL_OFFSET_TABLE_-bar2, %ebx
.section zedsec,"awT",@progbits
zed: