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ARM: move ARMUnwindOp.h into Support

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Move the ARM EHABI unwind opcode definitions from the ARM MCTargetDesc into LLVM
Support.  This enables sharing of the definitions across the ARM target code as
well as llvm-readobj.  This will allow implementation of the unwind decoding in
llvm-readobj.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@198576 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Saleem Abdulrasool
2014-01-06 00:15:00 +00:00
parent 0dc0e22ada
commit 733d01ed45
4 changed files with 41 additions and 37 deletions
Download Patch File Download Diff File Expand all files Collapse all files

15
lib/Target/ARM/MCTargetDesc/ARMELFStreamer.cpp
View File

@@ -17,7 +17,6 @@
#include "ARMArchName.h"
#include "ARMFPUName.h"
#include "ARMRegisterInfo.h"
#include "ARMUnwindOp.h"
#include "ARMUnwindOpAsm.h"
#include "llvm/ADT/SmallPtrSet.h"
#include "llvm/ADT/StringExtras.h"
@@ -40,6 +39,7 @@
#include "llvm/MC/MCStreamer.h"
#include "llvm/MC/MCSymbol.h"
#include "llvm/MC/MCValue.h"
#include "llvm/Support/ARMEHABI.h"
#include "llvm/Support/Debug.h"
#include "llvm/Support/ELF.h"
#include "llvm/Support/FormattedStream.h"
@@ -49,7 +49,8 @@
using namespace llvm;
static std::string GetAEABIUnwindPersonalityName(unsigned Index) {
assert(Index < NUM_PERSONALITY_INDEX && "Invalid personality index");
assert(Index < ARM::EHABI::NUM_PERSONALITY_INDEX &&
"Invalid personality index");
return (Twine("__aeabi_unwind_cpp_pr") + Twine(Index)).str();
}
@@ -909,7 +910,7 @@ void ARMELFStreamer::Reset() {
ExTab = NULL;
FnStart = NULL;
Personality = NULL;
PersonalityIndex = NUM_PERSONALITY_INDEX;
PersonalityIndex = ARM::EHABI::NUM_PERSONALITY_INDEX;
FPReg = ARM::SP;
FPOffset = 0;
SPOffset = 0;
@@ -937,7 +938,7 @@ void ARMELFStreamer::emitFnEnd() {
// Emit the exception index table entry
SwitchToExIdxSection(*FnStart);
if (PersonalityIndex < NUM_PERSONALITY_INDEX)
if (PersonalityIndex < ARM::EHABI::NUM_PERSONALITY_INDEX)
EmitPersonalityFixup(GetAEABIUnwindPersonalityName(PersonalityIndex));
const MCSymbolRefExpr *FnStartRef =
@@ -948,7 +949,7 @@ void ARMELFStreamer::emitFnEnd() {
EmitValue(FnStartRef, 4);
if (CantUnwind) {
EmitIntValue(EXIDX_CANTUNWIND, 4);
EmitIntValue(ARM::EHABI::EXIDX_CANTUNWIND, 4);
} else if (ExTab) {
// Emit a reference to the unwind opcodes in the ".ARM.extab" section.
const MCSymbolRefExpr *ExTabEntryRef =
@@ -960,7 +961,7 @@ void ARMELFStreamer::emitFnEnd() {
// For the __aeabi_unwind_cpp_pr0, we have to emit the unwind opcodes in
// the second word of exception index table entry. The size of the unwind
// opcodes should always be 4 bytes.
assert(PersonalityIndex == AEABI_UNWIND_CPP_PR0 &&
assert(PersonalityIndex == ARM::EHABI::AEABI_UNWIND_CPP_PR0 &&
"Compact model must use __aeabi_cpp_unwind_pr0 as personality");
assert(Opcodes.size() == 4u &&
"Unwind opcode size for __aeabi_cpp_unwind_pr0 must be equal to 4");
@@ -1015,7 +1016,7 @@ void ARMELFStreamer::FlushUnwindOpcodes(bool NoHandlerData) {
// For compact model 0, we have to emit the unwind opcodes in the .ARM.exidx
// section. Thus, we don't have to create an entry in the .ARM.extab
// section.
if (NoHandlerData && PersonalityIndex == AEABI_UNWIND_CPP_PR0)
if (NoHandlerData && PersonalityIndex == ARM::EHABI::AEABI_UNWIND_CPP_PR0)
return;
// Switch to .ARM.extab section.

125
lib/Target/ARM/MCTargetDesc/ARMUnwindOp.h
View File

@@ -1,125 +0,0 @@
//===-- ARMUnwindOp.h - ARM Unwind Opcodes ----------------------*- C++ -*-===//
//
// The LLVM Compiler Infrastructure
//
// This file is distributed under the University of Illinois Open Source
// License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
//
// This file defines the constants for the ARM unwind opcodes and exception
// handling table entry kinds.
//
//===----------------------------------------------------------------------===//
#ifndef ARM_UNWIND_OP_H
#define ARM_UNWIND_OP_H
namespace llvm {
/// ARM exception handling table entry kinds
enum ARMEHTEntryKind {
EHT_GENERIC = 0x00,
EHT_COMPACT = 0x80
};
enum {
/// Special entry for the function never unwind
EXIDX_CANTUNWIND = 0x1
};
/// ARM-defined frame unwinding opcodes
enum ARMUnwindOpcodes {
// Format: 00xxxxxx
// Purpose: vsp = vsp + ((x << 2) + 4)
UNWIND_OPCODE_INC_VSP = 0x00,
// Format: 01xxxxxx
// Purpose: vsp = vsp - ((x << 2) + 4)
UNWIND_OPCODE_DEC_VSP = 0x40,
// Format: 10000000 00000000
// Purpose: refuse to unwind
UNWIND_OPCODE_REFUSE = 0x8000,
// Format: 1000xxxx xxxxxxxx
// Purpose: pop r[15:12], r[11:4]
// Constraint: x != 0
UNWIND_OPCODE_POP_REG_MASK_R4 = 0x8000,
// Format: 1001xxxx
// Purpose: vsp = r[x]
// Constraint: x != 13 && x != 15
UNWIND_OPCODE_SET_VSP = 0x90,
// Format: 10100xxx
// Purpose: pop r[(4+x):4]
UNWIND_OPCODE_POP_REG_RANGE_R4 = 0xa0,
// Format: 10101xxx
// Purpose: pop r14, r[(4+x):4]
UNWIND_OPCODE_POP_REG_RANGE_R4_R14 = 0xa8,
// Format: 10110000
// Purpose: finish
UNWIND_OPCODE_FINISH = 0xb0,
// Format: 10110001 0000xxxx
// Purpose: pop r[3:0]
// Constraint: x != 0
UNWIND_OPCODE_POP_REG_MASK = 0xb100,
// Format: 10110010 x(uleb128)
// Purpose: vsp = vsp + ((x << 2) + 0x204)
UNWIND_OPCODE_INC_VSP_ULEB128 = 0xb2,
// Format: 10110011 xxxxyyyy
// Purpose: pop d[(x+y):x]
UNWIND_OPCODE_POP_VFP_REG_RANGE_FSTMFDX = 0xb300,
// Format: 10111xxx
// Purpose: pop d[(8+x):8]
UNWIND_OPCODE_POP_VFP_REG_RANGE_FSTMFDX_D8 = 0xb8,
// Format: 11000xxx
// Purpose: pop wR[(10+x):10]
UNWIND_OPCODE_POP_WIRELESS_MMX_REG_RANGE_WR10 = 0xc0,
// Format: 11000110 xxxxyyyy
// Purpose: pop wR[(x+y):x]
UNWIND_OPCODE_POP_WIRELESS_MMX_REG_RANGE = 0xc600,
// Format: 11000111 0000xxxx
// Purpose: pop wCGR[3:0]
// Constraint: x != 0
UNWIND_OPCODE_POP_WIRELESS_MMX_REG_MASK = 0xc700,
// Format: 11001000 xxxxyyyy
// Purpose: pop d[(16+x+y):(16+x)]
UNWIND_OPCODE_POP_VFP_REG_RANGE_FSTMFDD_D16 = 0xc800,
// Format: 11001001 xxxxyyyy
// Purpose: pop d[(x+y):x]
UNWIND_OPCODE_POP_VFP_REG_RANGE_FSTMFDD = 0xc900,
// Format: 11010xxx
// Purpose: pop d[(8+x):8]
UNWIND_OPCODE_POP_VFP_REG_RANGE_FSTMFDD_D8 = 0xd0
};
/// ARM-defined Personality Routine Index
enum ARMPersonalityRoutineIndex {
// To make the exception handling table become more compact, ARM defined
// several personality routines in EHABI. There are 3 different
// personality routines in ARM EHABI currently. It is possible to have 16
// pre-defined personality routines at most.
AEABI_UNWIND_CPP_PR0 = 0,
AEABI_UNWIND_CPP_PR1 = 1,
AEABI_UNWIND_CPP_PR2 = 2,
NUM_PERSONALITY_INDEX
};
}
#endif // ARM_UNWIND_OP_H

42
lib/Target/ARM/MCTargetDesc/ARMUnwindOpAsm.cpp
View File

@@ -13,8 +13,7 @@
//===----------------------------------------------------------------------===//
#include "ARMUnwindOpAsm.h"
#include "ARMUnwindOp.h"
#include "llvm/Support/ARMEHABI.h"
#include "llvm/Support/ErrorHandling.h"
#include "llvm/Support/LEB128.h"
@@ -50,14 +49,15 @@ namespace {
/// Emit the personality index prefix.
inline void EmitPersonalityIndex(unsigned PI) {
assert(PI < NUM_PERSONALITY_INDEX && "Invalid personality prefix");
EmitByte(EHT_COMPACT | PI);
assert(PI < ARM::EHABI::NUM_PERSONALITY_INDEX &&
"Invalid personality prefix");
EmitByte(ARM::EHABI::EHT_COMPACT | PI);
}
/// Fill the rest of bytes with FINISH opcode.
inline void FillFinishOpcode() {
while (Pos < Vec.size())
EmitByte(UNWIND_OPCODE_FINISH);
EmitByte(ARM::EHABI::UNWIND_OPCODE_FINISH);
}
};
}
@@ -85,22 +85,22 @@ void UnwindOpcodeAssembler::EmitRegSave(uint32_t RegSave) {
uint32_t UnmaskedReg = RegSave & 0xfff0u & (~Mask);
if (UnmaskedReg == 0u) {
// Pop r[4 : (4 + n)]
EmitInt8(UNWIND_OPCODE_POP_REG_RANGE_R4 | Range);
EmitInt8(ARM::EHABI::UNWIND_OPCODE_POP_REG_RANGE_R4 | Range);
RegSave &= 0x000fu;
} else if (UnmaskedReg == (1u << 14)) {
// Pop r[14] + r[4 : (4 + n)]
EmitInt8(UNWIND_OPCODE_POP_REG_RANGE_R4_R14 | Range);
EmitInt8(ARM::EHABI::UNWIND_OPCODE_POP_REG_RANGE_R4_R14 | Range);
RegSave &= 0x000fu;
}
}
// Two bytes opcode to save register r15-r4
if ((RegSave & 0xfff0u) != 0)
EmitInt16(UNWIND_OPCODE_POP_REG_MASK_R4 | (RegSave >> 4));
EmitInt16(ARM::EHABI::UNWIND_OPCODE_POP_REG_MASK_R4 | (RegSave >> 4));
// Opcode to save register r3-r0
if ((RegSave & 0x000fu) != 0)
EmitInt16(UNWIND_OPCODE_POP_REG_MASK | (RegSave & 0x000fu));
EmitInt16(ARM::EHABI::UNWIND_OPCODE_POP_REG_MASK | (RegSave & 0x000fu));
}
/// Emit unwind opcodes for .vsave directives
@@ -125,7 +125,7 @@ void UnwindOpcodeAssembler::EmitVFPRegSave(uint32_t VFPRegSave) {
Bit >>= 1;
}
EmitInt16(UNWIND_OPCODE_POP_VFP_REG_RANGE_FSTMFDD_D16 |
EmitInt16(ARM::EHABI::UNWIND_OPCODE_POP_VFP_REG_RANGE_FSTMFDD_D16 |
((i - 16) << 4) | Range);
}
@@ -147,34 +147,36 @@ void UnwindOpcodeAssembler::EmitVFPRegSave(uint32_t VFPRegSave) {
Bit >>= 1;
}
EmitInt16(UNWIND_OPCODE_POP_VFP_REG_RANGE_FSTMFDD | (i << 4) | Range);
EmitInt16(ARM::EHABI::UNWIND_OPCODE_POP_VFP_REG_RANGE_FSTMFDD | (i << 4) |
Range);
}
}
/// Emit unwind opcodes to copy address from source register to $sp.
void UnwindOpcodeAssembler::EmitSetSP(uint16_t Reg) {
EmitInt8(UNWIND_OPCODE_SET_VSP | Reg);
EmitInt8(ARM::EHABI::UNWIND_OPCODE_SET_VSP | Reg);
}
/// Emit unwind opcodes to add $sp with an offset.
void UnwindOpcodeAssembler::EmitSPOffset(int64_t Offset) {
if (Offset > 0x200) {
uint8_t Buff[16];
Buff[0] = UNWIND_OPCODE_INC_VSP_ULEB128;
Buff[0] = ARM::EHABI::UNWIND_OPCODE_INC_VSP_ULEB128;
size_t ULEBSize = encodeULEB128((Offset - 0x204) >> 2, Buff + 1);
EmitBytes(Buff, ULEBSize + 1);
} else if (Offset > 0) {
if (Offset > 0x100) {
EmitInt8(UNWIND_OPCODE_INC_VSP | 0x3fu);
EmitInt8(ARM::EHABI::UNWIND_OPCODE_INC_VSP | 0x3fu);
Offset -= 0x100;
}
EmitInt8(UNWIND_OPCODE_INC_VSP | static_cast<uint8_t>((Offset - 4) >> 2));
EmitInt8(ARM::EHABI::UNWIND_OPCODE_INC_VSP |
static_cast<uint8_t>((Offset - 4) >> 2));
} else if (Offset < 0) {
while (Offset < -0x100) {
EmitInt8(UNWIND_OPCODE_DEC_VSP | 0x3fu);
EmitInt8(ARM::EHABI::UNWIND_OPCODE_DEC_VSP | 0x3fu);
Offset += 0x100;
}
EmitInt8(UNWIND_OPCODE_DEC_VSP |
EmitInt8(ARM::EHABI::UNWIND_OPCODE_DEC_VSP |
static_cast<uint8_t>(((-Offset) - 4) >> 2));
}
}
@@ -186,7 +188,7 @@ void UnwindOpcodeAssembler::Finalize(unsigned &PersonalityIndex,
if (HasPersonality) {
// User-specifed personality routine: [ SIZE , OP1 , OP2 , ... ]
PersonalityIndex = NUM_PERSONALITY_INDEX;
PersonalityIndex = ARM::EHABI::NUM_PERSONALITY_INDEX;
size_t TotalSize = Ops.size() + 1;
size_t RoundUpSize = (TotalSize + 3) / 4 * 4;
Result.resize(RoundUpSize);
@@ -194,12 +196,12 @@ void UnwindOpcodeAssembler::Finalize(unsigned &PersonalityIndex,
} else {
if (Ops.size() <= 3) {
// __aeabi_unwind_cpp_pr0: [ 0x80 , OP1 , OP2 , OP3 ]
PersonalityIndex = AEABI_UNWIND_CPP_PR0;
PersonalityIndex = ARM::EHABI::AEABI_UNWIND_CPP_PR0;
Result.resize(4);
OpStreamer.EmitPersonalityIndex(PersonalityIndex);
} else {
// __aeabi_unwind_cpp_pr1: [ 0x81 , SIZE , OP1 , OP2 , ... ]
PersonalityIndex = AEABI_UNWIND_CPP_PR1;
PersonalityIndex = ARM::EHABI::AEABI_UNWIND_CPP_PR1;
size_t TotalSize = Ops.size() + 2;
size_t RoundUpSize = (TotalSize + 3) / 4 * 4;
Result.resize(RoundUpSize);

3
lib/Target/ARM/MCTargetDesc/ARMUnwindOpAsm.h
View File

@@ -15,10 +15,9 @@
#ifndef ARM_UNWIND_OP_ASM_H
#define ARM_UNWIND_OP_ASM_H
#include "ARMUnwindOp.h"
#include "llvm/ADT/SmallVector.h"
#include "llvm/ADT/StringRef.h"
#include "llvm/Support/ARMEHABI.h"
#include "llvm/Support/DataTypes.h"
namespace llvm {