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Mips direct object xgot support

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This patch provides support for the MIPS relocations:

    *)  R_MIPS_GOT_HI16
    *)  R_MIPS_GOT_LO16
    *)  R_MIPS_CALL_HI16
    *)  R_MIPS_CALL_LO16

These are used for large GOT instruction sequences.

Contributer: Jack Carter


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@168471 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Jack Carter 2012-11-21 23:38:59 +00:00
parent 17ced4521f
commit 198ad916d7
5 changed files with 87 additions and 1 deletions
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10
lib/Target/Mips/MCTargetDesc/MipsAsmBackend.cpp
View File

@ -42,6 +42,8 @@ static unsigned adjustFixupValue(unsigned Kind, uint64_t Value) {
case Mips::fixup_Mips_GOT_PAGE:
case Mips::fixup_Mips_GOT_OFST:
case Mips::fixup_Mips_GOT_DISP:
case Mips::fixup_Mips_GOT_LO16:
case Mips::fixup_Mips_CALL_LO16:
break;
case Mips::fixup_Mips_PC16:
// So far we are only using this type for branches.
@ -60,6 +62,8 @@ static unsigned adjustFixupValue(unsigned Kind, uint64_t Value) {
break;
case Mips::fixup_Mips_HI16:
case Mips::fixup_Mips_GOT_Local:
case Mips::fixup_Mips_GOT_HI16:
case Mips::fixup_Mips_CALL_HI16:
// Get the 2nd 16-bits. Also add 1 if bit 15 is 1.
Value = ((Value + 0x8000) >> 16) & 0xffff;
break;
@ -179,7 +183,11 @@ public:
{ "fixup_Mips_GOT_OFST", 0, 16, 0 },
{ "fixup_Mips_GOT_DISP", 0, 16, 0 },
{ "fixup_Mips_HIGHER", 0, 16, 0 },
{ "fixup_Mips_HIGHEST", 0, 16, 0 }
{ "fixup_Mips_HIGHEST", 0, 16, 0 },
{ "fixup_Mips_GOT_HI16", 0, 16, 0 },
{ "fixup_Mips_GOT_LO16", 0, 16, 0 },
{ "fixup_Mips_CALL_HI16", 0, 16, 0 },
{ "fixup_Mips_CALL_LO16", 0, 16, 0 }
};
if (Kind < FirstTargetFixupKind)

12
lib/Target/Mips/MCTargetDesc/MipsELFObjectWriter.cpp
View File

@ -179,6 +179,18 @@ unsigned MipsELFObjectWriter::GetRelocType(const MCValue &Target,
case Mips::fixup_Mips_HIGHEST:
Type = ELF::R_MIPS_HIGHEST;
break;
case Mips::fixup_Mips_GOT_HI16:
Type = ELF::R_MIPS_GOT_HI16;
break;
case Mips::fixup_Mips_GOT_LO16:
Type = ELF::R_MIPS_GOT_LO16;
break;
case Mips::fixup_Mips_CALL_HI16:
Type = ELF::R_MIPS_CALL_HI16;
break;
case Mips::fixup_Mips_CALL_LO16:
Type = ELF::R_MIPS_CALL_LO16;
break;
}
return Type;
}

12
lib/Target/Mips/MCTargetDesc/MipsFixupKinds.h
View File

@ -116,6 +116,18 @@ namespace Mips {
// resulting in - R_MIPS_HIGHEST
fixup_Mips_HIGHEST,
// resulting in - R_MIPS_GOT_HI16
fixup_Mips_GOT_HI16,
// resulting in - R_MIPS_GOT_LO16
fixup_Mips_GOT_LO16,
// resulting in - R_MIPS_CALL_HI16
fixup_Mips_CALL_HI16,
// resulting in - R_MIPS_CALL_LO16
fixup_Mips_CALL_LO16,
// Marker
LastTargetFixupKind,
NumTargetFixupKinds = LastTargetFixupKind - FirstTargetFixupKind

12
lib/Target/Mips/MCTargetDesc/MipsMCCodeEmitter.cpp
View File

@ -287,6 +287,18 @@ getMachineOpValue(const MCInst &MI, const MCOperand &MO,
case MCSymbolRefExpr::VK_Mips_HIGHEST:
FixupKind = Mips::fixup_Mips_HIGHEST;
break;
case MCSymbolRefExpr::VK_Mips_GOT_HI16:
FixupKind = Mips::fixup_Mips_GOT_HI16;
break;
case MCSymbolRefExpr::VK_Mips_GOT_LO16:
FixupKind = Mips::fixup_Mips_GOT_LO16;
break;
case MCSymbolRefExpr::VK_Mips_CALL_HI16:
FixupKind = Mips::fixup_Mips_CALL_HI16;
break;
case MCSymbolRefExpr::VK_Mips_CALL_LO16:
FixupKind = Mips::fixup_Mips_CALL_LO16;
break;
} // switch
Fixups.push_back(MCFixup::Create(0, MO.getExpr(), MCFixupKind(FixupKind)));

42
test/MC/Mips/xgot.ll Normal file
View File

@ -0,0 +1,42 @@
; RUN: llc -filetype=obj -mtriple mipsel-unknown-linux -mxgot %s -o - | elf-dump --dump-section-data | FileCheck %s
@.str = private unnamed_addr constant [16 x i8] c"ext_1=%d, i=%d\0A\00", align 1
@ext_1 = external global i32
define void @fill() nounwind {
entry:
; Check that the appropriate relocations were created.
; For the xgot case we want to see R_MIPS_[GOT|CALL]_[HI|LO]16.
; R_MIPS_HI16
; CHECK: ('r_type', 0x05)
; R_MIPS_LO16
; CHECK: ('r_type', 0x06)
; R_MIPS_GOT_HI16
; CHECK: ('r_type', 0x16)
; R_MIPS_GOT_LO16
; CHECK: ('r_type', 0x17)
; R_MIPS_GOT
; CHECK: ('r_type', 0x09)
; R_MIPS_LO16
; CHECK: ('r_type', 0x06)
; R_MIPS_CALL_HI16
; CHECK: ('r_type', 0x1e)
; R_MIPS_CALL_LO16
; CHECK: ('r_type', 0x1f)
%0 = load i32* @ext_1, align 4
%call = tail call i32 (i8*, ...)* @printf(i8* getelementptr inbounds ([16 x i8]* @.str, i32 0, i32 0), i32 %0) nounwind
ret void
}
declare i32 @printf(i8* nocapture, ...) nounwind