[Lldb-commits] [lldb] r126172 - in /lldb/trunk/source/Plugins/Instruction/ARM: EmulateInstructionARM.cpp EmulateInstructionARM.h
Johnny Chen
johnny.chen at apple.com
Mon Feb 21 17:01:04 PST 2011
Author: johnny
Date: Mon Feb 21 19:01:03 2011
New Revision: 126172
URL: http://llvm.org/viewvc/llvm-project?rev=126172&view=rev
Log:
Add emulation methods for "MVN (immediate)" and "MVN (register)".
Modified:
lldb/trunk/source/Plugins/Instruction/ARM/EmulateInstructionARM.cpp
lldb/trunk/source/Plugins/Instruction/ARM/EmulateInstructionARM.h
Modified: lldb/trunk/source/Plugins/Instruction/ARM/EmulateInstructionARM.cpp
URL: http://llvm.org/viewvc/llvm-project/lldb/trunk/source/Plugins/Instruction/ARM/EmulateInstructionARM.cpp?rev=126172&r1=126171&r2=126172&view=diff
==============================================================================
--- lldb/trunk/source/Plugins/Instruction/ARM/EmulateInstructionARM.cpp (original)
+++ lldb/trunk/source/Plugins/Instruction/ARM/EmulateInstructionARM.cpp Mon Feb 21 19:01:03 2011
@@ -714,12 +714,10 @@
return true;
}
-// Bitwise NOT (immediate) writes the bitwise inverse of an immediate value to
-// the destination register. It can optionally update the condition flags based
-// on the value.
-// MVN (immediate)
+// Bitwise NOT (immediate) writes the bitwise inverse of an immediate value to the destination register.
+// It can optionally update the condition flags based on the value.
bool
-EmulateInstructionARM::EmulateMVNRdImm (ARMEncoding encoding)
+EmulateInstructionARM::EmulateMVNImm (ARMEncoding encoding)
{
#if 0
// ARM pseudo code...
@@ -746,7 +744,6 @@
if (ConditionPassed())
{
uint32_t Rd; // the destination register
- uint32_t imm12; // the first operand to ThumbExpandImm_C or ARMExpandImm_C
uint32_t imm32; // the output after ThumbExpandImm_C or ARMExpandImm_C
uint32_t carry; // the carry bit after ThumbExpandImm_C or ARMExpandImm_C
bool setflags;
@@ -754,14 +751,16 @@
case eEncodingT1:
Rd = Bits32(opcode, 11, 8);
setflags = BitIsSet(opcode, 20);
- imm12 = Bit32(opcode, 26) << 11 | Bits32(opcode, 14, 12) << 8 | Bits32(opcode, 7, 0);
- imm32 = ThumbExpandImm_C(imm12, APSR_C, carry);
+ imm32 = ThumbExpandImm_C(opcode, APSR_C, carry);
break;
case eEncodingA1:
Rd = Bits32(opcode, 15, 12);
setflags = BitIsSet(opcode, 20);
- imm12 = Bits32(opcode, 11, 0);
- imm32 = ARMExpandImm_C(imm12, APSR_C, carry);
+ imm32 = ARMExpandImm_C(opcode, APSR_C, carry);
+ // if Rd == '1111' && S == '1' then SEE SUBS PC, LR and related instructions;
+ // TODO: Emulate SUBS PC, LR and related instructions.
+ if (Rd == 15 && setflags)
+ return false;
break;
default:
return false;
@@ -779,6 +778,88 @@
return true;
}
+// Bitwise NOT (register) writes the bitwise inverse of a register value to the destination register.
+// It can optionally update the condition flags based on the result.
+bool
+EmulateInstructionARM::EmulateMVNReg (ARMEncoding encoding)
+{
+#if 0
+ // ARM pseudo code...
+ if (ConditionPassed())
+ {
+ EncodingSpecificOperations();
+ (shifted, carry) = Shift_C(R[m], shift_t, shift_n, APSR.C);
+ result = NOT(shifted);
+ if d == 15 then // Can only occur for ARM encoding
+ ALUWritePC(result); // setflags is always FALSE here
+ else
+ R[d] = result;
+ if setflags then
+ APSR.N = result<31>;
+ APSR.Z = IsZeroBit(result);
+ APSR.C = carry;
+ // APSR.V unchanged
+ }
+#endif
+
+ bool success = false;
+ const uint32_t opcode = OpcodeAsUnsigned (&success);
+ if (!success)
+ return false;
+
+ if (ConditionPassed())
+ {
+ uint32_t Rm; // the source register
+ uint32_t Rd; // the destination register
+ ARM_ShifterType shift_t;
+ uint32_t shift_n; // the shift applied to the value read from Rm
+ bool setflags;
+ uint32_t carry; // the carry bit after the shift operation
+ switch (encoding) {
+ case eEncodingT1:
+ Rd = Bits32(opcode, 2, 0);
+ Rm = Bits32(opcode, 5, 3);
+ setflags = !InITBlock();
+ shift_t = SRType_LSL;
+ shift_n = 0;
+ if (InITBlock())
+ return false;
+ break;
+ case eEncodingT2:
+ Rd = Bits32(opcode, 11, 8);
+ Rm = Bits32(opcode, 3, 0);
+ setflags = BitIsSet(opcode, 20);
+ shift_n = DecodeImmShift(Bits32(opcode, 5, 4), Bits32(opcode, 14, 12)<<2 | Bits32(opcode, 7, 6), shift_t);
+ // if (BadReg(d) || BadReg(m)) then UNPREDICTABLE;
+ if ((BadReg(Rd) || BadReg(Rm)))
+ return false;
+ case eEncodingA1:
+ Rd = Bits32(opcode, 15, 12);
+ Rm = Bits32(opcode, 3, 0);
+ setflags = BitIsSet(opcode, 20);
+ shift_n = DecodeImmShift(Bits32(opcode, 6, 5), Bits32(opcode, 11, 7), shift_t);
+ break;
+ default:
+ return false;
+ }
+ uint32_t value = ReadCoreReg(Rm, &success);
+ if (!success)
+ return false;
+
+ uint32_t shifted = Shift_C(value, shift_t, shift_n, APSR_C, carry);
+ uint32_t result = ~shifted;
+
+ // The context specifies that an immediate is to be moved into Rd.
+ EmulateInstruction::Context context;
+ context.type = EmulateInstruction::eContextImmediate;
+ context.SetNoArgs ();
+
+ if (!WriteCoreRegOptionalFlags(context, result, Rd, setflags, carry))
+ return false;
+ }
+ return true;
+}
+
// PC relative immediate load into register, possibly followed by ADD (SP plus register).
// LDR (literal)
bool
@@ -5993,8 +6074,10 @@
{ 0x0ff0f010, 0x01100000, ARMvAll, eEncodingA1, eSize32, &EmulateInstructionARM::EmulateTSTReg, "tst<c> <Rn>, <Rm> {,<shift>}"},
- // move bitwise not
- { 0x0fef0000, 0x03e00000, ARMvAll, eEncodingA1, eSize32, &EmulateInstructionARM::EmulateMVNRdImm, "mvn{s}<c> <Rd>, #<const>"},
+ // mvn (immediate)
+ { 0x0fef0000, 0x03e00000, ARMvAll, eEncodingA1, eSize32, &EmulateInstructionARM::EmulateMVNImm, "mvn{s}<c> <Rd>, #<const>"},
+ // mvn (register)
+ { 0x0fef0010, 0x01e00000, ARMvAll, eEncodingA1, eSize32, &EmulateInstructionARM::EmulateMVNReg, "mvn{s}<c> <Rd>, <Rm> {,<shift>}"},
// asr (immediate)
{ 0x0fef0070, 0x01a00040, ARMvAll, eEncodingA1, eSize32, &EmulateInstructionARM::EmulateASRImm, "asr{s}<c> <Rd>, <Rm>, #imm"},
// asr (register)
@@ -6174,8 +6257,11 @@
// move immediate
{ 0xfffff800, 0x00002000, ARMvAll, eEncodingT1, eSize16, &EmulateInstructionARM::EmulateMOVRdImm, "movs|mov<c> <Rd>, #imm8"},
{ 0xfbef8000, 0xf04f0000, ARMV6T2_ABOVE, eEncodingT2, eSize32, &EmulateInstructionARM::EmulateMOVRdImm, "mov{s}<c>.w <Rd>, #<const>"},
- // move bitwise not
- { 0xfbef8000, 0xf06f0000, ARMV6T2_ABOVE, eEncodingT1, eSize32, &EmulateInstructionARM::EmulateMVNRdImm, "mvn{s} <Rd>, #<const>"},
+ // mvn (immediate)
+ { 0xfbef8000, 0xf06f0000, ARMV6T2_ABOVE, eEncodingT1, eSize32, &EmulateInstructionARM::EmulateMVNImm, "mvn{s} <Rd>, #<const>"},
+ // mvn (register)
+ { 0xffffffc0, 0x000043c0, ARMvAll, eEncodingT1, eSize16, &EmulateInstructionARM::EmulateMVNReg, "mvns|mvn<c> <Rd>, <Rm>"},
+ { 0xffef8000, 0xea6f0000, ARMV6T2_ABOVE, eEncodingT2, eSize32, &EmulateInstructionARM::EmulateMVNReg, "mvn{s}<c>.w <Rd>, <Rm> {,<shift>}"},
// compare a register with immediate
{ 0xfffff800, 0x00002800, ARMvAll, eEncodingT1, eSize16, &EmulateInstructionARM::EmulateCMPRnImm, "cmp<c> <Rn>, #imm8"},
// compare Rn with Rm (Rn and Rm both from r0-r7)
Modified: lldb/trunk/source/Plugins/Instruction/ARM/EmulateInstructionARM.h
URL: http://llvm.org/viewvc/llvm-project/lldb/trunk/source/Plugins/Instruction/ARM/EmulateInstructionARM.h?rev=126172&r1=126171&r2=126172&view=diff
==============================================================================
--- lldb/trunk/source/Plugins/Instruction/ARM/EmulateInstructionARM.h (original)
+++ lldb/trunk/source/Plugins/Instruction/ARM/EmulateInstructionARM.h Mon Feb 21 19:01:03 2011
@@ -417,10 +417,6 @@
bool
EmulateMOVRdImm (ARMEncoding encoding);
- // A8.6.106 MVN (immediate)
- bool
- EmulateMVNRdImm (ARMEncoding encoding);
-
// A8.6.35 CMP (immediate)
bool
EmulateCMPRnImm (ARMEncoding encoding);
@@ -629,9 +625,13 @@
bool
EmulateMUL (ARMEncoding encoding);
- // A8.6.107 MVN (register) - Encoding T1, A1
+ // A8.6.106 MVN (immediate)
+ bool
+ EmulateMVNImm (ARMEncoding encoding);
+
+ // A8.6.107 MVN (register)
bool
- EmulateMVNRegister (ARMEncoding encoding);
+ EmulateMVNReg (ARMEncoding encoding);
// A8.6.113 ORR (immediate)
bool
More information about the lldb-commits
mailing list