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There were two issues fixed:

Browse Source 
1. The ARM Darwin *r9 call instructions were pseudo-ized recently.
   Modify the ARMDisassemblerCore.cpp file to accomodate the change.

2. The disassembler was unnecessarily adding 8 to the sign-extended imm24:

   imm32 = SignExtend(imm24:'00', 32); // A8.6.23 BL, BLX (immediate)
                                       // Encoding A1

   It has no business doing such.  Removed the offending logic.

Add test cases to arm-tests.txt.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@127707 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Johnny Chen 2011-03-15 22:27:33 +00:00
parent 6046cffbaf
commit 276f6f9cf9
2 changed files with 12 additions and 13 deletions
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17
lib/Target/ARM/Disassembler/ARMDisassemblerCore.cpp
View File

@ -679,8 +679,8 @@ static bool DisassembleCoprocessor(MCInst &MI, unsigned Opcode, uint32_t insn,
}
// Branch Instructions.
// BLr9: SignExtend(Imm24:'00', 32)
// Bcc, BLr9_pred: SignExtend(Imm24:'00', 32) Pred0 Pred1
// BL: SignExtend(Imm24:'00', 32)
// Bcc, BL_pred: SignExtend(Imm24:'00', 32) Pred0 Pred1
// SMC: ZeroExtend(imm4, 32)
// SVC: ZeroExtend(Imm24, 32)
//
@ -760,7 +760,7 @@ static bool DisassembleBrFrm(MCInst &MI, unsigned Opcode, uint32_t insn,
return true;
}
assert((Opcode == ARM::Bcc || Opcode == ARM::BLr9 || Opcode == ARM::BLr9_pred
assert((Opcode == ARM::Bcc || Opcode == ARM::BL || Opcode == ARM::BL_pred
|| Opcode == ARM::SMC || Opcode == ARM::SVC) &&
"Unexpected Opcode");
@ -778,12 +778,6 @@ static bool DisassembleBrFrm(MCInst &MI, unsigned Opcode, uint32_t insn,
unsigned Imm26 = slice(insn, 23, 0) << 2;
//Imm32 = signextend<signed int, 26>(Imm26);
Imm32 = SignExtend32<26>(Imm26);
// When executing an ARM instruction, PC reads as the address of the current
// instruction plus 8. The assembler subtracts 8 from the difference
// between the branch instruction and the target address, disassembler has
// to add 8 to compensate.
Imm32 += 8;
}
MI.addOperand(MCOperand::CreateImm(Imm32));
@ -793,7 +787,7 @@ static bool DisassembleBrFrm(MCInst &MI, unsigned Opcode, uint32_t insn,
}
// Misc. Branch Instructions.
// BLXr9, BXr9
// BLX, BX
// BX, BX_RET
static bool DisassembleBrMiscFrm(MCInst &MI, unsigned Opcode, uint32_t insn,
unsigned short NumOps, unsigned &NumOpsAdded, BO B) {
@ -810,8 +804,7 @@ static bool DisassembleBrMiscFrm(MCInst &MI, unsigned Opcode, uint32_t insn,
return true;
// BLX and BX take one GPR reg.
if (Opcode == ARM::BLXr9 || Opcode == ARM::BLXr9_pred ||
Opcode == ARM::BLX || Opcode == ARM::BLX_pred ||
if (Opcode == ARM::BLX || Opcode == ARM::BLX_pred ||
Opcode == ARM::BX) {
assert(NumOps >= 1 && OpInfo[OpIdx].RegClass == ARM::GPRRegClassID &&
"Reg operand expected");

8
test/MC/Disassembler/ARM/arm-tests.txt
View File

@ -1,7 +1,13 @@
# RUN: llvm-mc --disassemble %s -triple=arm-apple-darwin9 | FileCheck %s
# CHECK: b #0
0xfe 0xff 0xff 0xea
0x00 0x00 0x00 0xea
# CHECK: bl #7732
0x8d 0x07 0x00 0xeb
# CHECK: bleq #-4
0xff 0xff 0xff 0x0b
# CHECK: bfc r8, #0, #16
0x1f 0x80 0xcf 0xe7