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Teach ARM/MC/ELF to handle R_ARM_JUMP24 relocation type for conditional jumps.

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(yes, this is different from R_ARM_CALL)

- Adds a new method getARMBranchTargetOpValue() which handles the
  necessary distinction between the conditional and unconditional br/bl
  needed for ARM/ELF

At least for ARM mode, the needed fixup for conditional versus unconditional
br/bl is identical, but the ARM docs and existing ARM tools expect this
reloc type...

Added a few FIXME's for future naming fixups in ARMInstrInfo.td




git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@124895 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Jason W Kim 2011-02-04 19:47:15 +00:00
parent cb6404711b
commit 685c350ae7
9 changed files with 88 additions and 16 deletions
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12
lib/MC/ELFObjectWriter.cpp
View File

@ -1503,7 +1503,7 @@ unsigned ARMELFObjectWriter::GetRelocType(const MCValue &Target,
break;
}
break;
case ARM::fixup_arm_branch:
case ARM::fixup_arm_uncondbranch:
switch (Modifier) {
case MCSymbolRefExpr::VK_ARM_PLT:
Type = ELF::R_ARM_PLT32;
@ -1513,6 +1513,9 @@ unsigned ARMELFObjectWriter::GetRelocType(const MCValue &Target,
break;
}
break;
case ARM::fixup_arm_condbranch:
Type = ELF::R_ARM_JUMP24;
break;
case ARM::fixup_arm_movt_hi16:
case ARM::fixup_arm_movt_hi16_pcrel:
Type = ELF::R_ARM_MOVT_PREL;
@ -1565,11 +1568,12 @@ unsigned ARMELFObjectWriter::GetRelocType(const MCValue &Target,
case ARM::fixup_arm_thumb_br:
assert(0 && "Unimplemented");
break;
case ARM::fixup_arm_branch:
// FIXME: Differentiate between R_ARM_CALL and
// R_ARM_JUMP24 (latter used for conditional jumps)
case ARM::fixup_arm_uncondbranch:
Type = ELF::R_ARM_CALL;
break;
case ARM::fixup_arm_condbranch:
Type = ELF::R_ARM_JUMP24;
break;
case ARM::fixup_arm_movt_hi16:
Type = ELF::R_ARM_MOVT_ABS;
break;

3
lib/MC/MachObjectWriter.cpp
View File

@ -940,7 +940,8 @@ public:
case ARM::fixup_arm_ldst_pcrel_12:
case ARM::fixup_arm_pcrel_10:
case ARM::fixup_arm_adr_pcrel_12:
case ARM::fixup_arm_branch:
case ARM::fixup_arm_condbranch:
case ARM::fixup_arm_uncondbranch:
RelocType = unsigned(macho::RIT_ARM_Branch24Bit);
// Report as 'long', even though that is not quite accurate.
Log2Size = llvm::Log2_32(4);

9
lib/Target/ARM/ARMAsmBackend.cpp
View File

@ -67,7 +67,8 @@ public:
{ "fixup_arm_adr_pcrel_12", 1, 24, MCFixupKindInfo::FKF_IsPCRel },
{ "fixup_t2_adr_pcrel_12", 0, 32, MCFixupKindInfo::FKF_IsPCRel |
MCFixupKindInfo::FKF_IsAlignedDownTo32Bits},
{ "fixup_arm_branch", 0, 24, MCFixupKindInfo::FKF_IsPCRel },
{ "fixup_arm_condbranch", 0, 24, MCFixupKindInfo::FKF_IsPCRel },
{ "fixup_arm_uncondbranch", 0, 24, MCFixupKindInfo::FKF_IsPCRel },
{ "fixup_t2_condbranch", 0, 32, MCFixupKindInfo::FKF_IsPCRel },
{ "fixup_t2_uncondbranch", 0, 32, MCFixupKindInfo::FKF_IsPCRel },
{ "fixup_arm_thumb_br", 0, 16, MCFixupKindInfo::FKF_IsPCRel },
@ -254,7 +255,8 @@ static unsigned adjustFixupValue(unsigned Kind, uint64_t Value) {
return swapped;
}
case ARM::fixup_arm_branch:
case ARM::fixup_arm_condbranch:
case ARM::fixup_arm_uncondbranch:
// These values don't encode the low two bits since they're always zero.
// Offset by 8 just as above.
return 0xffffff & ((Value - 8) >> 2);
@ -454,7 +456,8 @@ static unsigned getFixupKindNumBytes(unsigned Kind) {
case ARM::fixup_arm_ldst_pcrel_12:
case ARM::fixup_arm_pcrel_10:
case ARM::fixup_arm_adr_pcrel_12:
case ARM::fixup_arm_branch:
case ARM::fixup_arm_condbranch:
case ARM::fixup_arm_uncondbranch:
return 3;
case FK_Data_4:

2
lib/Target/ARM/ARMCodeEmitter.cpp
View File

@ -187,6 +187,8 @@ namespace {
const { return 0; }
unsigned getUnconditionalBranchTargetOpValue(const MachineInstr &MI,
unsigned Op) const { return 0; }
unsigned getARMBranchTargetOpValue(const MachineInstr &MI, unsigned Op)
const { return 0; }
unsigned getCCOutOpValue(const MachineInstr &MI, unsigned Op)
const { return 0; }
unsigned getSOImmOpValue(const MachineInstr &MI, unsigned Op)

9
lib/Target/ARM/ARMFixupKinds.h
View File

@ -40,9 +40,12 @@ enum Fixups {
// fixup_t2_adr_pcrel_12 - 12-bit PC relative relocation for the ADR
// instruction.
fixup_t2_adr_pcrel_12,
// fixup_arm_branch - 24-bit PC relative relocation for direct branch
// instructions.
fixup_arm_branch,
// fixup_arm_condbranch - 24-bit PC relative relocation for conditional branch
// instructions.
fixup_arm_condbranch,
// fixup_arm_uncondbranch - 24-bit PC relative relocation for
// branch instructions. (unconditional)
fixup_arm_uncondbranch,
// fixup_t2_condbranch - 20-bit PC relative relocation for Thumb2 direct
// uconditional branch instructions.
fixup_t2_condbranch,

22
lib/Target/ARM/ARMInstrInfo.td
View File

@ -293,20 +293,36 @@ def fsub_mlx : PatFrag<(ops node:$lhs, node:$rhs),(fsub node:$lhs, node:$rhs),[{
//
// Branch target.
// FIXME: rename brtarget to t2_brtarget
def brtarget : Operand<OtherVT> {
let EncoderMethod = "getBranchTargetOpValue";
}
// FIXME: get rid of this one?
def uncondbrtarget : Operand<OtherVT> {
let EncoderMethod = "getUnconditionalBranchTargetOpValue";
}
// Branch target for ARM. Handles conditional/unconditional
def br_target : Operand<OtherVT> {
let EncoderMethod = "getARMBranchTargetOpValue";
}
// Call target.
// FIXME: rename bltarget to t2_bl_target?
def bltarget : Operand<i32> {
// Encoded the same as branch targets.
let EncoderMethod = "getBranchTargetOpValue";
}
// Call target for ARM. Handles conditional/unconditional
// FIXME: rename bl_target to t2_bltarget?
def bl_target : Operand<i32> {
// Encoded the same as branch targets.
let EncoderMethod = "getARMBranchTargetOpValue";
}
// A list of registers separated by comma. Used by load/store multiple.
def RegListAsmOperand : AsmOperandClass {
let Name = "RegList";
@ -1271,7 +1287,7 @@ let isCall = 1,
D16, D17, D18, D19, D20, D21, D22, D23,
D24, D25, D26, D27, D28, D29, D30, D31, CPSR, FPSCR],
Uses = [SP] in {
def BL : ABXI<0b1011, (outs), (ins bltarget:$func, variable_ops),
def BL : ABXI<0b1011, (outs), (ins bl_target:$func, variable_ops),
IIC_Br, "bl\t$func",
[(ARMcall tglobaladdr:$func)]>,
Requires<[IsARM, IsNotDarwin]> {
@ -1280,7 +1296,7 @@ let isCall = 1,
let Inst{23-0} = func;
}
def BL_pred : ABI<0b1011, (outs), (ins bltarget:$func, variable_ops),
def BL_pred : ABI<0b1011, (outs), (ins bl_target:$func, variable_ops),
IIC_Br, "bl", "\t$func",
[(ARMcall_pred tglobaladdr:$func)]>,
Requires<[IsARM, IsNotDarwin]> {
@ -1456,7 +1472,7 @@ let isBranch = 1, isTerminator = 1 in {
// FIXME: should be able to write a pattern for ARMBrcond, but can't use
// a two-value operand where a dag node expects two operands. :(
def Bcc : ABI<0b1010, (outs), (ins brtarget:$target),
def Bcc : ABI<0b1010, (outs), (ins br_target:$target),
IIC_Br, "b", "\t$target",
[/*(ARMbrcond bb:$target, imm:$cc, CCR:$ccr)*/]> {
bits<24> target;

38
lib/Target/ARM/ARMMCCodeEmitter.cpp
View File

@ -99,6 +99,10 @@ public:
uint32_t getUnconditionalBranchTargetOpValue(const MCInst &MI, unsigned OpIdx,
SmallVectorImpl<MCFixup> &Fixups) const;
/// getARMBranchTargetOpValue - Return encoding info for 24-bit immediate
/// branch target.
uint32_t getARMBranchTargetOpValue(const MCInst &MI, unsigned OpIdx,
SmallVectorImpl<MCFixup> &Fixups) const;
/// getAdrLabelOpValue - Return encoding info for 12-bit immediate
/// ADR label target.
@ -473,6 +477,23 @@ getThumbCBTargetOpValue(const MCInst &MI, unsigned OpIdx,
return ::getBranchTargetOpValue(MI, OpIdx, ARM::fixup_arm_thumb_cb, Fixups);
}
/// Return true if this branch has a non-always predication
static bool HasConditionalBranch(const MCInst &MI) {
int NumOp = MI.getNumOperands();
if (NumOp >= 2) {
for (int i = 0; i < NumOp-1; ++i) {
const MCOperand &MCOp1 = MI.getOperand(i);
const MCOperand &MCOp2 = MI.getOperand(i + 1);
if (MCOp1.isImm() && MCOp2.isReg() &&
(MCOp2.getReg() == 0 || MCOp2.getReg() == ARM::CPSR)) {
if (ARMCC::CondCodes(MCOp1.getImm()) != ARMCC::AL)
return true;
}
}
}
return false;
}
/// getBranchTargetOpValue - Return encoding info for 24-bit immediate branch
/// target.
uint32_t ARMMCCodeEmitter::
@ -483,9 +504,24 @@ getBranchTargetOpValue(const MCInst &MI, unsigned OpIdx,
if (Subtarget->isThumb2())
return
::getBranchTargetOpValue(MI, OpIdx, ARM::fixup_t2_condbranch, Fixups);
return ::getBranchTargetOpValue(MI, OpIdx, ARM::fixup_arm_branch, Fixups);
return getARMBranchTargetOpValue(MI, OpIdx, Fixups);
}
/// getBranchTargetOpValue - Return encoding info for 24-bit immediate branch
/// target.
uint32_t ARMMCCodeEmitter::
getARMBranchTargetOpValue(const MCInst &MI, unsigned OpIdx,
SmallVectorImpl<MCFixup> &Fixups) const {
if (HasConditionalBranch(MI))
return ::getBranchTargetOpValue(MI, OpIdx,
ARM::fixup_arm_condbranch, Fixups);
return ::getBranchTargetOpValue(MI, OpIdx,
ARM::fixup_arm_uncondbranch, Fixups);
}
/// getUnconditionalBranchTargetOpValue - Return encoding info for 24-bit
/// immediate branch target.
uint32_t ARMMCCodeEmitter::

2
test/MC/ARM/arm_fixups.s
View File

@ -2,6 +2,6 @@
// RUN: FileCheck < %t %s
// CHECK: bl _printf @ encoding: [A,A,A,0xeb]
// CHECK: @ fixup A - offset: 0, value: _printf, kind: fixup_arm_branch
// CHECK: @ fixup A - offset: 0, value: _printf, kind: fixup_arm_uncondbranch
bl _printf

7
utils/TableGen/EDEmitter.cpp
View File

@ -325,6 +325,9 @@ static int X86TypeFromOpName(LiteralConstantEmitter *type,
PCR("uncondbrtarget");
PCR("bltarget");
// all I, ARM mode only, conditional/unconditional
PCR("br_target");
PCR("bl_target");
return 1;
}
@ -600,6 +603,10 @@ static int ARMFlagFromOpName(LiteralConstantEmitter *type,
MISC("t_bcctarget", "kOperandTypeARMBranchTarget"); // ?
MISC("t_cbtarget", "kOperandTypeARMBranchTarget"); // ?
MISC("bltarget", "kOperandTypeARMBranchTarget"); // ?
MISC("br_target", "kOperandTypeARMBranchTarget"); // ?
MISC("bl_target", "kOperandTypeARMBranchTarget"); // ?
MISC("t_bltarget", "kOperandTypeARMBranchTarget"); // ?
MISC("t_blxtarget", "kOperandTypeARMBranchTarget"); // ?
MISC("so_reg", "kOperandTypeARMSoReg"); // R, R, I