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The Mips specific relocation R_MIPS_GOT_DISP

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is used in cases where global symbols are 
directly represented in the GOT and we use an 
offset into the global offset table.

This patch adds direct object support for R_MIPS_GOT_DISP.

llvm-svn: 160183
This commit is contained in:
Jack Carter 2012-07-13 19:15:47 +00:00
parent d4d064d1da
commit b8e3cf5fbc
5 changed files with 30 additions and 4 deletions
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4
lib/Target/Mips/MCTargetDesc/MipsAsmBackend.cpp
View File

@ -40,6 +40,7 @@ static unsigned adjustFixupValue(unsigned Kind, uint64_t Value) {
case Mips::fixup_Mips_GPOFF_LO:
case Mips::fixup_Mips_GOT_PAGE:
case Mips::fixup_Mips_GOT_OFST:
case Mips::fixup_Mips_GOT_DISP:
break;
case Mips::fixup_Mips_PC16:
// So far we are only using this type for branches.
@ -166,7 +167,8 @@ public:
{ "fixup_Mips_GPOFF_HI", 0, 16, 0 },
{ "fixup_Mips_GPOFF_LO", 0, 16, 0 },
{ "fixup_Mips_GOT_PAGE", 0, 16, 0 },
{ "fixup_Mips_GOT_OFST", 0, 16, 0 }
{ "fixup_Mips_GOT_OFST", 0, 16, 0 },
{ "fixup_Mips_GOT_DISP", 0, 16, 0 }
};
if (Kind < FirstTargetFixupKind)

3
lib/Target/Mips/MCTargetDesc/MipsELFObjectWriter.cpp
View File

@ -156,6 +156,9 @@ unsigned MipsELFObjectWriter::GetRelocType(const MCValue &Target,
case Mips::fixup_Mips_GOT_OFST:
Type = ELF::R_MIPS_GOT_OFST;
break;
case Mips::fixup_Mips_GOT_DISP:
Type = ELF::R_MIPS_GOT_DISP;
break;
case Mips::fixup_Mips_GPOFF_HI:
Type = setRType((unsigned)ELF::R_MIPS_GPREL16, Type);
Type = setRType2((unsigned)ELF::R_MIPS_SUB, Type);

3
lib/Target/Mips/MCTargetDesc/MipsFixupKinds.h
View File

@ -107,6 +107,9 @@ namespace Mips {
// resulting in - R_MIPS_GOT_OFST
fixup_Mips_GOT_OFST,
// resulting in - R_MIPS_GOT_DISP
fixup_Mips_GOT_DISP,
// Marker
LastTargetFixupKind,
NumTargetFixupKinds = LastTargetFixupKind - FirstTargetFixupKind

6
lib/Target/Mips/MCTargetDesc/MipsMCCodeEmitter.cpp
View File

@ -201,9 +201,6 @@ getMachineOpValue(const MCInst &MI, const MCOperand &MO,
switch(cast<MCSymbolRefExpr>(Expr)->getKind()) {
default: llvm_unreachable("Unknown fixup kind!");
break;
case MCSymbolRefExpr::VK_Mips_GOT_DISP :
llvm_unreachable("fixup kind VK_Mips_GOT_DISP not supported for direct object!");
break;
case MCSymbolRefExpr::VK_Mips_GPOFF_HI :
FixupKind = Mips::fixup_Mips_GPOFF_HI;
break;
@ -216,6 +213,9 @@ getMachineOpValue(const MCInst &MI, const MCOperand &MO,
case MCSymbolRefExpr::VK_Mips_GOT_OFST :
FixupKind = Mips::fixup_Mips_GOT_OFST;
break;
case MCSymbolRefExpr::VK_Mips_GOT_DISP :
FixupKind = Mips::fixup_Mips_GOT_DISP;
break;
case MCSymbolRefExpr::VK_Mips_GPREL:
FixupKind = Mips::fixup_Mips_GPREL16;
break;

18
test/MC/Mips/r-mips-got-disp.ll Normal file
View File

@ -0,0 +1,18 @@
; RUN: llc -march=mips64el -filetype=obj -mcpu=mips64r2 < %s -o - | elf-dump --dump-section-data | FileCheck %s
; Check that the R_MIPS_GOT_DISP relocations were created.
; CHECK: ('r_type', 0x13)
@shl = global i64 1, align 8
@.str = private unnamed_addr constant [8 x i8] c"0x%llx\0A\00", align 1
define i32 @main() nounwind {
entry:
%0 = load i64* @shl, align 8
%call = tail call i32 (i8*, ...)* @printf(i8* getelementptr inbounds ([8 x i8]* @.str, i64 0, i64 0), i64 %0) nounwind
ret i32 0
}
declare i32 @printf(i8* nocapture, ...) nounwind