Fix assembly/disassembly of Thumb2 ADR instructions with immediate operands.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@139422 91177308-0d34-0410-b5e6-96231b3b80d8

lib/Target/ARM/ARMInstrThumb2.td

@@ -1146,7 +1146,7 @@ class T2PCOneRegImm<dag oops, dag iops, InstrItinClass itin,
 // assembler.
 def t2ADR : T2PCOneRegImm<(outs rGPR:$Rd),
               (ins t2adrlabel:$addr, pred:$p),
-              IIC_iALUi, "adr{$p}.w\t$Rd, #$addr", []> {
+              IIC_iALUi, "adr{$p}.w\t$Rd, $addr", []> {
   let Inst{31-27} = 0b11110;
   let Inst{25-24} = 0b10;
   // Inst{23:21} = '11' (add = FALSE) or '00' (add = TRUE)
@@ -1163,6 +1163,8 @@ def t2ADR : T2PCOneRegImm<(outs rGPR:$Rd),
   let Inst{26}    = addr{11};
   let Inst{14-12} = addr{10-8};
   let Inst{7-0}   = addr{7-0};
+
+  let DecoderMethod = "DecodeT2Adr";
 }
 
 let neverHasSideEffects = 1, isReMaterializable = 1 in

lib/Target/ARM/Disassembler/ARMDisassembler.cpp

@@ -299,6 +299,8 @@ static DecodeStatus DecodeT2LDRDPreInstruction(llvm::MCInst &Inst,unsigned Insn,
                                uint64_t Address, const void *Decoder);
 static DecodeStatus DecodeT2STRDPreInstruction(llvm::MCInst &Inst,unsigned Insn,
                                uint64_t Address, const void *Decoder);
+static DecodeStatus DecodeT2Adr(llvm::MCInst &Inst, unsigned Val,
+                                uint64_t Address, const void *Decoder);
 
 #include "ARMGenDisassemblerTables.inc"
 #include "ARMGenInstrInfo.inc"
@@ -3762,3 +3764,19 @@ DecodeT2STRDPreInstruction(llvm::MCInst &Inst, unsigned Insn,
 
   return S;
 }
+
+static DecodeStatus DecodeT2Adr(llvm::MCInst &Inst, uint32_t Insn,
+                                uint64_t Address, const void *Decoder) {
+  unsigned sign1 = fieldFromInstruction32(Insn, 21, 1);
+  unsigned sign2 = fieldFromInstruction32(Insn, 23, 1);
+  if (sign1 != sign2) return MCDisassembler::Fail;
+
+  unsigned Val = fieldFromInstruction32(Insn, 0, 8);
+  Val |= fieldFromInstruction32(Insn, 12, 3) << 8;
+  Val |= fieldFromInstruction32(Insn, 26, 1) << 11;
+  Val |= sign1 << 12;
+  Inst.addOperand(MCOperand::CreateImm(SignExtend32<13>(Val)));
+
+  return MCDisassembler::Success;
+}
+

lib/Target/ARM/MCTargetDesc/ARMMCCodeEmitter.cpp

@@ -662,7 +662,12 @@ getT2AdrLabelOpValue(const MCInst &MI, unsigned OpIdx,
   if (MO.isExpr())
     return ::getBranchTargetOpValue(MI, OpIdx, ARM::fixup_t2_adr_pcrel_12,
                                     Fixups);
-  return MO.getImm();
+  int32_t Val = MO.getImm();
+  if (Val < 0) {
+    Val *= -1;
+    Val |= 0x1000;
+  }
+  return Val;
 }
 
 /// getAdrLabelOpValue - Return encoding info for 8-bit immediate ADR label

test/MC/ARM/basic-thumb2-instructions.s

@@ -107,6 +107,12 @@ _func:
 @ FIXME: ADR
 @------------------------------------------------------------------------------
 
+        subw r11, pc, #3270
+        adr.w r11, #-826
+
+@ CHECK: subw	r11, pc, #3270          @ encoding: [0xaf,0xf6,0xc6,0x4b]
+@ CHECK: adr.w	r11, #-826              @ encoding: [0xaf,0xf2,0x3a,0x3b]
+
 @------------------------------------------------------------------------------
 @ AND (immediate)
 @------------------------------------------------------------------------------

test/MC/Disassembler/ARM/thumb2.txt

@@ -88,8 +88,13 @@
 
 
 #------------------------------------------------------------------------------
-# FIXME: ADR
+# ADR
 #------------------------------------------------------------------------------
+# CHECK: subw r11, pc, #3270
+# CHECK: subw r11, pc, #826
+
+0xaf 0xf6 0xc6 0x4b
+0xaf 0xf2 0x3a 0x3b
 
 #------------------------------------------------------------------------------
 # AND (immediate)