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audk/ArmPkg/Library/ArmDisassemblerLib/ArmDisassembler.c

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/** @file
Default exception handler
Copyright (c) 2008 - 2010, Apple Inc. All rights reserved.<BR>
Copyright (c) 2021, Arm Limited. All rights reserved.<BR>
SPDX-License-Identifier: BSD-2-Clause-Patent
**/
#include <Base.h>
#include <Library/BaseLib.h>
#include <Library/PrintLib.h>
#include <Library/ArmDisassemblerLib.h>
CHAR8 *gCondition[] = {
"EQ",
"NE",
"CS",
"CC",
"MI",
"PL",
"VS",
"VC",
"HI",
"LS",
"GE",
"LT",
"GT",
"LE",
"",
"2"
};
#define COND(_a) gCondition[((_a) >> 28)]
CHAR8 *gReg[] = {
"r0",
"r1",
"r2",
"r3",
"r4",
"r5",
"r6",
"r7",
"r8",
"r9",
"r10",
"r11",
"r12",
"sp",
"lr",
"pc"
};
CHAR8 *gLdmAdr[] = {
"DA",
"IA",
"DB",
"IB"
};
CHAR8 *gLdmStack[] = {
"FA",
"FD",
"EA",
"ED"
};
#define LDM_EXT(_reg, _off) ((_reg == 13) ? gLdmStack[(_off)] : gLdmAdr[(_off)])
#define SIGN(_U) ((_U) ? "" : "-")
#define WRITE(_Write) ((_Write) ? "!" : "")
#define BYTE(_B) ((_B) ? "B":"")
#define USER(_B) ((_B) ? "^" : "")
CHAR8 mMregListStr[4*15 + 1];
CHAR8 *
MRegList (
UINT32 OpCode
)
{
UINTN Index, Start, End;
BOOLEAN First;
mMregListStr[0] = '\0';
AsciiStrCatS (mMregListStr, sizeof mMregListStr, "{");
for (Index = 0, First = TRUE; Index <= 15; Index++) {
if ((OpCode & (1 << Index)) != 0) {
Start = End = Index;
for (Index++; ((OpCode & (1 << Index)) != 0) && Index <= 15; Index++) {
End = Index;
}
if (!First) {
AsciiStrCatS (mMregListStr, sizeof mMregListStr, ",");
} else {
First = FALSE;
}
if (Start == End) {
AsciiStrCatS (mMregListStr, sizeof mMregListStr, gReg[Start]);
AsciiStrCatS (mMregListStr, sizeof mMregListStr, ", ");
} else {
AsciiStrCatS (mMregListStr, sizeof mMregListStr, gReg[Start]);
AsciiStrCatS (mMregListStr, sizeof mMregListStr, "-");
AsciiStrCatS (mMregListStr, sizeof mMregListStr, gReg[End]);
}
}
}
if (First) {
AsciiStrCatS (mMregListStr, sizeof mMregListStr, "ERROR");
}
AsciiStrCatS (mMregListStr, sizeof mMregListStr, "}");
// BugBug: Make caller pass in buffer it is cleaner
return mMregListStr;
}
CHAR8 *
FieldMask (
IN UINT32 Mask
)
{
return "";
}
UINT32
RotateRight (
IN UINT32 Op,
IN UINT32 Shift
)
{
return (Op >> Shift) | (Op << (32 - Shift));
}
/**
Place a disassembly of **OpCodePtr into buffer, and update OpCodePtr to
point to next instruction.
We cheat and only decode instructions that access
memory. If the instruction is not found we dump the instruction in hex.
@param OpCodePtr Pointer to pointer of ARM instruction to disassemble.
@param Buf Buffer to sprintf disassembly into.
@param Size Size of Buf in bytes.
@param Extended TRUE dump hex for instruction too.
**/
VOID
DisassembleArmInstruction (
IN UINT32 **OpCodePtr,
OUT CHAR8 *Buf,
OUT UINTN Size,
IN BOOLEAN Extended
)
{
UINT32 OpCode;
CHAR8 *Type;
CHAR8 *Root;
BOOLEAN Imm, Pre, Up, WriteBack, Write, Load, Sign, Half;
UINT32 Rn, Rd, Rm;
UINT32 IMod, Offset8, Offset12;
UINT32 Index;
UINT32 ShiftImm, Shift;
OpCode = **OpCodePtr;
Imm = (OpCode & BIT25) == BIT25; // I
Pre = (OpCode & BIT24) == BIT24; // P
Up = (OpCode & BIT23) == BIT23; // U
WriteBack = (OpCode & BIT22) == BIT22; // B, also called S
Write = (OpCode & BIT21) == BIT21; // W
Load = (OpCode & BIT20) == BIT20; // L
Sign = (OpCode & BIT6) == BIT6; // S
Half = (OpCode & BIT5) == BIT5; // H
Rn = (OpCode >> 16) & 0xf;
Rd = (OpCode >> 12) & 0xf;
Rm = (OpCode & 0xf);
if (Extended) {
Index = AsciiSPrint (Buf, Size, "0x%08x ", OpCode);
Buf += Index;
Size -= Index;
}
// LDREX, STREX
if ((OpCode & 0x0fe000f0) == 0x01800090) {
if (Load) {
// A4.1.27 LDREX{<cond>} <Rd>, [<Rn>]
AsciiSPrint (Buf, Size, "LDREX%a %a, [%a]", COND (OpCode), gReg[Rd], gReg[Rn]);
} else {
// A4.1.103 STREX{<cond>} <Rd>, <Rm>, [<Rn>]
AsciiSPrint (Buf, Size, "STREX%a %a, %a, [%a]", COND (OpCode), gReg[Rd], gReg[Rn], gReg[Rn]);
}
return;
}
// LDM/STM
if ((OpCode & 0x0e000000) == 0x08000000) {
if (Load) {
// A4.1.20 LDM{<cond>}<addressing_mode> <Rn>{!}, <registers>
// A4.1.21 LDM{<cond>}<addressing_mode> <Rn>, <registers_without_pc>^
// A4.1.22 LDM{<cond>}<addressing_mode> <Rn>{!}, <registers_and_pc>^
AsciiSPrint (Buf, Size, "LDM%a%a, %a%a, %a", COND (OpCode), LDM_EXT (Rn, (OpCode >> 23) & 3), gReg[Rn], WRITE (Write), MRegList (OpCode), USER (WriteBack));
} else {
// A4.1.97 STM{<cond>}<addressing_mode> <Rn>{!}, <registers>
// A4.1.98 STM{<cond>}<addressing_mode> <Rn>, <registers>^
AsciiSPrint (Buf, Size, "STM%a%a, %a%a, %a", COND (OpCode), LDM_EXT (Rn, (OpCode >> 23) & 3), gReg[Rn], WRITE (Write), MRegList (OpCode), USER (WriteBack));
}
return;
}
// LDR/STR Address Mode 2
if (((OpCode & 0x0c000000) == 0x04000000) || ((OpCode & 0xfd70f000) == 0xf550f000)) {
Offset12 = OpCode & 0xfff;
if ((OpCode & 0xfd70f000) == 0xf550f000) {
Index = AsciiSPrint (Buf, Size, "PLD");
} else {
Index = AsciiSPrint (Buf, Size, "%a%a%a%a %a, ", Load ? "LDR" : "STR", COND (OpCode), BYTE (WriteBack), (!(Pre) && Write) ? "T" : "", gReg[Rd]);
}
if (Pre) {
if (!Imm) {
// A5.2.2 [<Rn>, #+/-<offset_12>]
// A5.2.5 [<Rn>, #+/-<offset_12>]
AsciiSPrint (&Buf[Index], Size - Index, "[%a, #%a0x%x]%a", gReg[Rn], SIGN (Up), Offset12, WRITE (Write));
} else if ((OpCode & 0x03000ff0) == 0x03000000) {
// A5.2.3 [<Rn>, +/-<Rm>]
// A5.2.6 [<Rn>, +/-<Rm>]!
AsciiSPrint (&Buf[Index], Size - Index, "[%a, #%a%a]%a", gReg[Rn], SIGN (Up), WRITE (Write));
} else {
// A5.2.4 [<Rn>, +/-<Rm>, LSL #<shift_imm>]
// A5.2.7 [<Rn>, +/-<Rm>, LSL #<shift_imm>]!
ShiftImm = (OpCode >> 7) & 0x1f;
Shift = (OpCode >> 5) & 0x3;
if (Shift == 0x0) {
Type = "LSL";
} else if (Shift == 0x1) {
Type = "LSR";
if (ShiftImm == 0) {
ShiftImm = 32;
}
} else if (Shift == 0x2) {
Type = "ASR";
} else if (ShiftImm == 0) {
AsciiSPrint (&Buf[Index], Size - Index, "[%a, #%a%a, %a, RRX]%a", gReg[Rn], SIGN (Up), gReg[Rm], WRITE (Write));
return;
} else {
Type = "ROR";
}
AsciiSPrint (&Buf[Index], Size - Index, "[%a, #%a%a, %a, #%d]%a", gReg[Rn], SIGN (Up), gReg[Rm], Type, ShiftImm, WRITE (Write));
}
} else {
// !Pre
if (!Imm) {
// A5.2.8 [<Rn>], #+/-<offset_12>
AsciiSPrint (&Buf[Index], Size - Index, "[%a], #%a0x%x", gReg[Rn], SIGN (Up), Offset12);
} else if ((OpCode & 0x03000ff0) == 0x03000000) {
// A5.2.9 [<Rn>], +/-<Rm>
AsciiSPrint (&Buf[Index], Size - Index, "[%a], #%a%a", gReg[Rn], SIGN (Up), gReg[Rm]);
} else {
// A5.2.10 [<Rn>], +/-<Rm>, LSL #<shift_imm>
ShiftImm = (OpCode >> 7) & 0x1f;
Shift = (OpCode >> 5) & 0x3;
if (Shift == 0x0) {
Type = "LSL";
} else if (Shift == 0x1) {
Type = "LSR";
if (ShiftImm == 0) {
ShiftImm = 32;
}
} else if (Shift == 0x2) {
Type = "ASR";
} else if (ShiftImm == 0) {
AsciiSPrint (&Buf[Index], Size - Index, "[%a], #%a%a, %a, RRX", gReg[Rn], SIGN (Up), gReg[Rm]);
// FIx me
return;
} else {
Type = "ROR";
}
AsciiSPrint (&Buf[Index], Size - Index, "[%a], #%a%a, %a, #%d", gReg[Rn], SIGN (Up), gReg[Rm], Type, ShiftImm);
}
}
return;
}
if ((OpCode & 0x0e000000) == 0x00000000) {
// LDR/STR address mode 3
// LDR|STR{<cond>}H|SH|SB|D <Rd>, <addressing_mode>
if (Load) {
if (!Sign) {
Root = "LDR%aH %a, ";
} else if (!Half) {
Root = "LDR%aSB %a, ";
} else {
Root = "LDR%aSH %a, ";
}
} else {
if (!Sign) {
Root = "STR%aH %a ";
} else if (!Half) {
Root = "LDR%aD %a ";
} else {
Root = "STR%aD %a ";
}
}
Index = AsciiSPrint (Buf, Size, Root, COND (OpCode), gReg[Rd]);
Sign = (OpCode & BIT6) == BIT6;
Half = (OpCode & BIT5) == BIT5;
Offset8 = ((OpCode >> 4) | (OpCode * 0xf)) & 0xff;
if (Pre & !Write) {
// Immediate offset/index
if (WriteBack) {
// A5.3.2 [<Rn>, #+/-<offset_8>]
// A5.3.4 [<Rn>, #+/-<offset_8>]!
AsciiSPrint (&Buf[Index], Size - Index, "[%a, #%a%d]%a", gReg[Rn], SIGN (Up), Offset8, WRITE (Write));
} else {
// A5.3.3 [<Rn>, +/-<Rm>]
// A5.3.5 [<Rn>, +/-<Rm>]!
AsciiSPrint (&Buf[Index], Size - Index, "[%a, #%a%]a", gReg[Rn], SIGN (Up), gReg[Rm], WRITE (Write));
}
} else {
// Register offset/index
if (WriteBack) {
// A5.3.6 [<Rn>], #+/-<offset_8>
AsciiSPrint (&Buf[Index], Size - Index, "[%a], #%a%d", gReg[Rn], SIGN (Up), Offset8);
} else {
// A5.3.7 [<Rn>], +/-<Rm>
AsciiSPrint (&Buf[Index], Size - Index, "[%a], #%a%a", gReg[Rn], SIGN (Up), gReg[Rm]);
}
}
return;
}
if ((OpCode & 0x0fb000f0) == 0x01000050) {
// A4.1.108 SWP SWP{<cond>}B <Rd>, <Rm>, [<Rn>]
// A4.1.109 SWPB SWP{<cond>}B <Rd>, <Rm>, [<Rn>]
AsciiSPrint (Buf, Size, "SWP%a%a %a, %a, [%a]", COND (OpCode), BYTE (WriteBack), gReg[Rd], gReg[Rm], gReg[Rn]);
return;
}
if ((OpCode & 0xfe5f0f00) == 0xf84d0500) {
// A4.1.90 SRS SRS<addressing_mode> #<mode>{!}
AsciiSPrint (Buf, Size, "SRS%a #0x%x%a", gLdmStack[(OpCode >> 23) & 3], OpCode & 0x1f, WRITE (Write));
return;
}
if ((OpCode & 0xfe500f00) == 0xf8100500) {
// A4.1.59 RFE<addressing_mode> <Rn>{!}
AsciiSPrint (Buf, Size, "RFE%a %a", gLdmStack[(OpCode >> 23) & 3], gReg[Rn], WRITE (Write));
return;
}
if ((OpCode & 0xfff000f0) == 0xe1200070) {
// A4.1.7 BKPT <immed_16>
AsciiSPrint (Buf, Size, "BKPT %x", ((OpCode >> 8) | (OpCode & 0xf)) & 0xffff);
return;
}
if ((OpCode & 0xfff10020) == 0xf1000000) {
// A4.1.16 CPS<effect> <iflags> {, #<mode>}
if (((OpCode >> 6) & 0x7) == 0) {
AsciiSPrint (Buf, Size, "CPS #0x%x", (OpCode & 0x2f));
} else {
IMod = (OpCode >> 18) & 0x3;
Index = AsciiSPrint (
Buf,
Size,
"CPS%a %a%a%a",
(IMod == 3) ? "ID" : "IE",
((OpCode & BIT8) != 0) ? "A" : "",
((OpCode & BIT7) != 0) ? "I" : "",
((OpCode & BIT6) != 0) ? "F" : ""
);
if ((OpCode & BIT17) != 0) {
AsciiSPrint (&Buf[Index], Size - Index, ", #0x%x", OpCode & 0x1f);
}
}
return;
}
if ((OpCode & 0x0f000000) == 0x0f000000) {
// A4.1.107 SWI{<cond>} <immed_24>
AsciiSPrint (Buf, Size, "SWI%a %x", COND (OpCode), OpCode & 0x00ffffff);
return;
}
if ((OpCode & 0x0fb00000) == 0x01000000) {
// A4.1.38 MRS{<cond>} <Rd>, CPSR MRS{<cond>} <Rd>, SPSR
AsciiSPrint (Buf, Size, "MRS%a %a, %a", COND (OpCode), gReg[Rd], WriteBack ? "SPSR" : "CPSR");
return;
}
if ((OpCode & 0x0db00000) == 0x01200000) {
// A4.1.38 MSR{<cond>} CPSR_<fields>, #<immediate> MSR{<cond>} CPSR_<fields>, <Rm>
if (Imm) {
// MSR{<cond>} CPSR_<fields>, #<immediate>
AsciiSPrint (Buf, Size, "MRS%a %a_%a, #0x%x", COND (OpCode), WriteBack ? "SPSR" : "CPSR", FieldMask ((OpCode >> 16) & 0xf), RotateRight (OpCode & 0xf, ((OpCode >> 8) & 0xf) *2));
} else {
// MSR{<cond>} CPSR_<fields>, <Rm>
AsciiSPrint (Buf, Size, "MRS%a %a_%a, %a", COND (OpCode), WriteBack ? "SPSR" : "CPSR", gReg[Rd]);
}
return;
}
if ((OpCode & 0xff000010) == 0xfe000000) {
// A4.1.13 CDP{<cond>} <coproc>, <opcode_1>, <CRd>, <CRn>, <CRm>, <opcode_2>
AsciiSPrint (Buf, Size, "CDP%a 0x%x, 0x%x, CR%d, CR%d, CR%d, 0x%x", COND (OpCode), (OpCode >> 8) & 0xf, (OpCode >> 20) & 0xf, Rn, Rd, Rm, (OpCode >> 5) &0x7);
return;
}
if ((OpCode & 0x0e000000) == 0x0c000000) {
// A4.1.19 LDC and A4.1.96 SDC
if ((OpCode & 0xf0000000) == 0xf0000000) {
Index = AsciiSPrint (Buf, Size, "%a2 0x%x, CR%d, ", Load ? "LDC" : "SDC", (OpCode >> 8) & 0xf, Rd);
} else {
Index = AsciiSPrint (Buf, Size, "%a%a 0x%x, CR%d, ", Load ? "LDC" : "SDC", COND (OpCode), (OpCode >> 8) & 0xf, Rd);
}
if (!Pre) {
if (!Write) {
// A5.5.5.5 [<Rn>], <option>
AsciiSPrint (&Buf[Index], Size - Index, "[%a], {0x%x}", gReg[Rn], OpCode & 0xff);
} else {
// A.5.5.4 [<Rn>], #+/-<offset_8>*4
AsciiSPrint (&Buf[Index], Size - Index, "[%a], #%a0x%x*4", gReg[Rn], SIGN (Up), OpCode & 0xff);
}
} else {
// A5.5.5.2 [<Rn>, #+/-<offset_8>*4 ]!
AsciiSPrint (&Buf[Index], Size - Index, "[%a, #%a0x%x*4]%a", gReg[Rn], SIGN (Up), OpCode & 0xff, WRITE (Write));
}
}
if ((OpCode & 0x0f000010) == 0x0e000010) {
// A4.1.32 MRC2, MCR2
AsciiSPrint (Buf, Size, "%a%a 0x%x, 0x%x, %a, CR%d, CR%d, 0x%x", Load ? "MRC" : "MCR", COND (OpCode), (OpCode >> 8) & 0xf, (OpCode >> 20) & 0xf, gReg[Rd], Rn, Rm, (OpCode >> 5) &0x7);
return;
}
if ((OpCode & 0x0ff00000) == 0x0c400000) {
// A4.1.33 MRRC2, MCRR2
AsciiSPrint (Buf, Size, "%a%a 0x%x, 0x%x, %a, %a, CR%d", Load ? "MRRC" : "MCRR", COND (OpCode), (OpCode >> 4) & 0xf, (OpCode >> 20) & 0xf, gReg[Rd], gReg[Rn], Rm);
return;
}
AsciiSPrint (Buf, Size, "Faulting OpCode 0x%08x", OpCode);
*OpCodePtr += 1;
return;
}
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