* Copyright (C) 2006 by Dominic Rath *
* Dominic.Rath@gmx.de *
* *
+ * Copyright (C) 2009 by David Brownell *
+ * *
* This program is free software; you can redistribute it and/or modify *
* it under the terms of the GNU General Public License as published by *
* the Free Software Foundation; either version 2 of the License, or *
#include "config.h"
#endif
+#include "target.h"
#include "arm_disassembler.h"
+#include <helper/log.h>
-#include "log.h"
-#include <string.h>
+/*
+ * This disassembler supports two main functions for OpenOCD:
+ *
+ * - Various "disassemble" commands. OpenOCD can serve as a
+ * machine-language debugger, without help from GDB.
+ *
+ * - Single stepping. Not all ARM cores support hardware single
+ * stepping. To work without that support, the debugger must
+ * be able to decode instructions to find out where to put a
+ * "next instruction" breakpoint.
+ *
+ * In addition, interpretation of ETM trace data needs some of the
+ * decoding mechanisms.
+ *
+ * At this writing (September 2009) neither function is complete.
+ *
+ * - ARM decoding
+ * * Old-style syntax (not UAL) is generally used
+ * * VFP instructions are not understood (ARMv5 and later)
+ * except as coprocessor 10/11 operations
+ * * Most ARM instructions through ARMv6 are decoded, but some
+ * of the post-ARMv4 opcodes may not be handled yet
+ * CPS, SDIV, UDIV, LDREX*, STREX*, QASX, ...
+ * * NEON instructions are not understood (ARMv7-A)
+ *
+ * - Thumb/Thumb2 decoding
+ * * UAL syntax should be consistently used
+ * * Any Thumb2 instructions used in Cortex-M3 (ARMv7-M) should
+ * be handled properly. Accordingly, so should the subset
+ * used in Cortex-M0/M1; and "original" 16-bit Thumb from
+ * ARMv4T and ARMv5T.
+ * * Conditional effects of Thumb2 "IT" (if-then) instructions
+ * are not handled: the affected instructions are not shown
+ * with their now-conditional suffixes.
+ * * Some ARMv6 and ARMv7-M Thumb2 instructions may not be
+ * handled (minimally for coprocessor access).
+ * * SIMD instructions, and some other Thumb2 instructions
+ * from ARMv7-A, are not understood.
+ *
+ * - ThumbEE decoding
+ * * As a Thumb2 variant, the Thumb2 comments (above) apply.
+ * * Opcodes changed by ThumbEE mode are not handled; these
+ * instructions wrongly decode as LDM and STM.
+ *
+ * - Jazelle decoding ... no support whatsoever for Jazelle mode
+ * or decoding. ARM encourages use of the more generic ThumbEE
+ * mode, instead of Jazelle mode, in current chips.
+ *
+ * - Single-step/emulation ... spotty support, which is only weakly
+ * tested. Thumb2 is not supported. (Arguably a full simulator
+ * is not needed to support just single stepping. Recognizing
+ * branch vs non-branch instructions suffices, except when the
+ * instruction faults and triggers a synchronous exception which
+ * can be intercepted using other means.)
+ *
+ * ARM DDI 0406B "ARM Architecture Reference Manual, ARM v7-A and
+ * ARM v7-R edition" gives the most complete coverage of the various
+ * generations of ARM instructions. At this writing it is publicly
+ * accessible to anyone willing to create an account at the ARM
+ * web site; see http://www.arm.com/documentation/ for information.
+ *
+ * ARM DDI 0403C "ARMv7-M Architecture Reference Manual" provides
+ * more details relevant to the Thumb2-only processors (such as
+ * the Cortex-M implementations).
+ */
/* textual represenation of the condition field */
/* ALways (default) is ommitted (empty string) */
-char *arm_condition_strings[] =
+static const char *arm_condition_strings[] =
{
"EQ", "NE", "CS", "CC", "MI", "PL", "VS", "VC", "HI", "LS", "GE", "LT", "GT", "LE", "", "NV"
};
/* make up for C's missing ROR */
-u32 ror(u32 value, int places)
-{
- return (value >> places) | (value << (32 - places));
+static uint32_t ror(uint32_t value, int places)
+{
+ return (value >> places) | (value << (32 - places));
+}
+
+static int evaluate_unknown(uint32_t opcode,
+ uint32_t address, struct arm_instruction *instruction)
+{
+ instruction->type = ARM_UNDEFINED_INSTRUCTION;
+ snprintf(instruction->text, 128,
+ "0x%8.8" PRIx32 "\t0x%8.8" PRIx32
+ "\tUNDEFINED INSTRUCTION", address, opcode);
+ return ERROR_OK;
}
-int evaluate_pld(u32 opcode, u32 address, arm_instruction_t *instruction)
+static int evaluate_pld(uint32_t opcode,
+ uint32_t address, struct arm_instruction *instruction)
{
/* PLD */
- if ((opcode & 0x0d70f0000) == 0x0550f000)
+ if ((opcode & 0x0d70f000) == 0x0550f000)
{
instruction->type = ARM_PLD;
-
- snprintf(instruction->text, 128, "0x%8.8x\t0x%8.8x\tPLD ...TODO...", address, opcode);
-
+
+ snprintf(instruction->text, 128, "0x%8.8" PRIx32 "\t0x%8.8" PRIx32 "\tPLD ...TODO...", address, opcode);
+
return ERROR_OK;
}
- else
- {
- instruction->type = ARM_UNDEFINED_INSTRUCTION;
- return ERROR_OK;
+ return evaluate_unknown(opcode, address, instruction);
+}
+
+static int evaluate_srs(uint32_t opcode,
+ uint32_t address, struct arm_instruction *instruction)
+{
+ const char *wback = (opcode & (1 << 21)) ? "!" : "";
+ const char *mode = "";
+
+ switch ((opcode >> 23) & 0x3) {
+ case 0:
+ mode = "DA";
+ break;
+ case 1:
+ /* "IA" is default */
+ break;
+ case 2:
+ mode = "DB";
+ break;
+ case 3:
+ mode = "IB";
+ break;
}
-
- ERROR("should never reach this point");
- return -1;
+
+ switch (opcode & 0x0e500000) {
+ case 0x08400000:
+ snprintf(instruction->text, 128, "0x%8.8" PRIx32
+ "\t0x%8.8" PRIx32
+ "\tSRS%s\tSP%s, #%d",
+ address, opcode,
+ mode, wback,
+ (unsigned)(opcode & 0x1f));
+ break;
+ case 0x08100000:
+ snprintf(instruction->text, 128, "0x%8.8" PRIx32
+ "\t0x%8.8" PRIx32
+ "\tRFE%s\tr%d%s",
+ address, opcode,
+ mode,
+ (unsigned)((opcode >> 16) & 0xf), wback);
+ break;
+ default:
+ return evaluate_unknown(opcode, address, instruction);
+ }
+ return ERROR_OK;
}
-int evaluate_swi(u32 opcode, u32 address, arm_instruction_t *instruction)
+static int evaluate_swi(uint32_t opcode,
+ uint32_t address, struct arm_instruction *instruction)
{
instruction->type = ARM_SWI;
-
- snprintf(instruction->text, 128, "0x%8.8x\t0x%8.8x\tSWI 0x%6.6x", address, opcode, (opcode & 0xffffff));
-
+
+ snprintf(instruction->text, 128,
+ "0x%8.8" PRIx32 "\t0x%8.8" PRIx32 "\tSVC %#6.6" PRIx32,
+ address, opcode, (opcode & 0xffffff));
+
return ERROR_OK;
}
-int evaluate_blx_imm(u32 opcode, u32 address, arm_instruction_t *instruction)
+static int evaluate_blx_imm(uint32_t opcode,
+ uint32_t address, struct arm_instruction *instruction)
{
int offset;
- u32 immediate;
- u32 target_address;
-
+ uint32_t immediate;
+ uint32_t target_address;
+
instruction->type = ARM_BLX;
immediate = opcode & 0x00ffffff;
-
+
/* sign extend 24-bit immediate */
if (immediate & 0x00800000)
offset = 0xff000000 | immediate;
else
offset = immediate;
-
+
/* shift two bits left */
offset <<= 2;
-
+
/* odd/event halfword */
if (opcode & 0x01000000)
offset |= 0x2;
-
+
target_address = address + 8 + offset;
-
- snprintf(instruction->text, 128, "0x%8.8x\t0x%8.8x\tBLX 0x%8.8x", address, opcode, target_address);
-
+
+ snprintf(instruction->text, 128, "0x%8.8" PRIx32 "\t0x%8.8" PRIx32 "\tBLX 0x%8.8" PRIx32 "", address, opcode, target_address);
+
instruction->info.b_bl_bx_blx.reg_operand = -1;
instruction->info.b_bl_bx_blx.target_address = target_address;
-
+
return ERROR_OK;
}
-int evaluate_b_bl(u32 opcode, u32 address, arm_instruction_t *instruction)
+static int evaluate_b_bl(uint32_t opcode,
+ uint32_t address, struct arm_instruction *instruction)
{
- u8 L;
- u32 immediate;
+ uint8_t L;
+ uint32_t immediate;
int offset;
- u32 target_address;
-
+ uint32_t target_address;
+
immediate = opcode & 0x00ffffff;
L = (opcode & 0x01000000) >> 24;
-
+
/* sign extend 24-bit immediate */
if (immediate & 0x00800000)
offset = 0xff000000 | immediate;
else
offset = immediate;
-
+
/* shift two bits left */
offset <<= 2;
-
+
target_address = address + 8 + offset;
if (L)
instruction->type = ARM_BL;
else
instruction->type = ARM_B;
-
- snprintf(instruction->text, 128, "0x%8.8x\t0x%8.8x\tB%s%s 0x%8.8x", address, opcode,
+
+ snprintf(instruction->text, 128, "0x%8.8" PRIx32 "\t0x%8.8" PRIx32 "\tB%s%s 0x%8.8" PRIx32 , address, opcode,
(L) ? "L" : "", COND(opcode), target_address);
-
+
instruction->info.b_bl_bx_blx.reg_operand = -1;
instruction->info.b_bl_bx_blx.target_address = target_address;
-
+
return ERROR_OK;
}
/* Coprocessor load/store and double register transfers */
/* both normal and extended instruction space (condition field b1111) */
-int evaluate_ldc_stc_mcrr_mrrc(u32 opcode, u32 address, arm_instruction_t *instruction)
+static int evaluate_ldc_stc_mcrr_mrrc(uint32_t opcode,
+ uint32_t address, struct arm_instruction *instruction)
{
- u8 cp_num = (opcode & 0xf00) >> 8;
-
+ uint8_t cp_num = (opcode & 0xf00) >> 8;
+
/* MCRR or MRRC */
if (((opcode & 0x0ff00000) == 0x0c400000) || ((opcode & 0x0ff00000) == 0x0c400000))
{
- u8 cp_opcode, Rd, Rn, CRm;
+ uint8_t cp_opcode, Rd, Rn, CRm;
char *mnemonic;
-
+
cp_opcode = (opcode & 0xf0) >> 4;
Rd = (opcode & 0xf000) >> 12;
Rn = (opcode & 0xf0000) >> 16;
CRm = (opcode & 0xf);
-
+
/* MCRR */
if ((opcode & 0x0ff00000) == 0x0c400000)
{
instruction->type = ARM_MCRR;
mnemonic = "MCRR";
}
-
+
/* MRRC */
if ((opcode & 0x0ff00000) == 0x0c500000)
{
instruction->type = ARM_MRRC;
mnemonic = "MRRC";
}
-
- snprintf(instruction->text, 128, "0x%8.8x\t0x%8.8x\t%s%s p%i, %x, r%i, r%i, c%i",
- address, opcode, mnemonic, COND(opcode), cp_num, cp_opcode, Rd, Rn, CRm);
+
+ snprintf(instruction->text, 128,
+ "0x%8.8" PRIx32 "\t0x%8.8" PRIx32
+ "\t%s%s%s p%i, %x, r%i, r%i, c%i",
+ address, opcode, mnemonic,
+ ((opcode & 0xf0000000) == 0xf0000000)
+ ? "2" : COND(opcode),
+ COND(opcode), cp_num, cp_opcode, Rd, Rn, CRm);
}
else /* LDC or STC */
{
- u8 CRd, Rn, offset;
- u8 U, N;
+ uint8_t CRd, Rn, offset;
+ uint8_t U;
char *mnemonic;
char addressing_mode[32];
-
+
CRd = (opcode & 0xf000) >> 12;
Rn = (opcode & 0xf0000) >> 16;
- offset = (opcode & 0xff);
-
+ offset = (opcode & 0xff) << 2;
+
/* load/store */
if (opcode & 0x00100000)
{
instruction->type = ARM_STC;
mnemonic = "STC";
}
-
+
U = (opcode & 0x00800000) >> 23;
- N = (opcode & 0x00400000) >> 22;
-
+
/* addressing modes */
- if ((opcode & 0x01200000) == 0x01000000) /* immediate offset */
- snprintf(addressing_mode, 32, "[r%i, #%s0x%2.2x*4]", Rn, (U) ? "" : "-", offset);
- else if ((opcode & 0x01200000) == 0x01200000) /* immediate pre-indexed */
- snprintf(addressing_mode, 32, "[r%i, #%s0x%2.2x*4]!", Rn, (U) ? "" : "-", offset);
- else if ((opcode & 0x01200000) == 0x00200000) /* immediate post-indexed */
- snprintf(addressing_mode, 32, "[r%i], #%s0x%2.2x*4", Rn, (U) ? "" : "-", offset);
+ if ((opcode & 0x01200000) == 0x01000000) /* offset */
+ snprintf(addressing_mode, 32, "[r%i, #%s%d]",
+ Rn, U ? "" : "-", offset);
+ else if ((opcode & 0x01200000) == 0x01200000) /* pre-indexed */
+ snprintf(addressing_mode, 32, "[r%i, #%s%d]!",
+ Rn, U ? "" : "-", offset);
+ else if ((opcode & 0x01200000) == 0x00200000) /* post-indexed */
+ snprintf(addressing_mode, 32, "[r%i], #%s%d",
+ Rn, U ? "" : "-", offset);
else if ((opcode & 0x01200000) == 0x00000000) /* unindexed */
- snprintf(addressing_mode, 32, "[r%i], #0x%2.2x", Rn, offset);
+ snprintf(addressing_mode, 32, "[r%i], {%d}",
+ Rn, offset >> 2);
- snprintf(instruction->text, 128, "0x%8.8x\t0x%8.8x\t%s%s%s p%i, c%i, %s",
- address, opcode, mnemonic, ((opcode & 0xf0000000) == 0xf0000000) ? COND(opcode) : "2",
- (N) ? "L" : "",
- cp_num, CRd, addressing_mode);
+ snprintf(instruction->text, 128, "0x%8.8" PRIx32
+ "\t0x%8.8" PRIx32
+ "\t%s%s%s p%i, c%i, %s",
+ address, opcode, mnemonic,
+ ((opcode & 0xf0000000) == 0xf0000000)
+ ? "2" : COND(opcode),
+ (opcode & (1 << 22)) ? "L" : "",
+ cp_num, CRd, addressing_mode);
}
-
+
return ERROR_OK;
}
/* Coprocessor data processing instructions */
/* Coprocessor register transfer instructions */
/* both normal and extended instruction space (condition field b1111) */
-int evaluate_cdp_mcr_mrc(u32 opcode, u32 address, arm_instruction_t *instruction)
+static int evaluate_cdp_mcr_mrc(uint32_t opcode,
+ uint32_t address, struct arm_instruction *instruction)
{
- char* cond;
+ const char *cond;
char* mnemonic;
- u8 cp_num, opcode_1, CRd_Rd, CRn, CRm, opcode_2;
-
+ uint8_t cp_num, opcode_1, CRd_Rd, CRn, CRm, opcode_2;
+
cond = ((opcode & 0xf0000000) == 0xf0000000) ? "2" : COND(opcode);
cp_num = (opcode & 0xf00) >> 8;
CRd_Rd = (opcode & 0xf000) >> 12;
CRn = (opcode & 0xf0000) >> 16;
CRm = (opcode & 0xf);
opcode_2 = (opcode & 0xe0) >> 5;
-
+
/* CDP or MRC/MCR */
if (opcode & 0x00000010) /* bit 4 set -> MRC/MCR */
{
instruction->type = ARM_MCR;
mnemonic = "MCR";
}
-
+
opcode_1 = (opcode & 0x00e00000) >> 21;
-
- snprintf(instruction->text, 128, "0x%8.8x\t0x%8.8x\t%s%s p%i, 0x%2.2x, r%i, c%i, c%i, 0x%2.2x",
+
+ snprintf(instruction->text, 128, "0x%8.8" PRIx32 "\t0x%8.8" PRIx32 "\t%s%s p%i, 0x%2.2x, r%i, c%i, c%i, 0x%2.2x",
address, opcode, mnemonic, cond,
cp_num, opcode_1, CRd_Rd, CRn, CRm, opcode_2);
}
{
instruction->type = ARM_CDP;
mnemonic = "CDP";
-
+
opcode_1 = (opcode & 0x00f00000) >> 20;
-
- snprintf(instruction->text, 128, "0x%8.8x\t0x%8.8x\t%s%s p%i, 0x%2.2x, c%i, c%i, c%i, 0x%2.2x",
+
+ snprintf(instruction->text, 128, "0x%8.8" PRIx32 "\t0x%8.8" PRIx32 "\t%s%s p%i, 0x%2.2x, c%i, c%i, c%i, 0x%2.2x",
address, opcode, mnemonic, cond,
cp_num, opcode_1, CRd_Rd, CRn, CRm, opcode_2);
}
-
+
return ERROR_OK;
}
/* Load/store instructions */
-int evaluate_load_store(u32 opcode, u32 address, arm_instruction_t *instruction)
+static int evaluate_load_store(uint32_t opcode,
+ uint32_t address, struct arm_instruction *instruction)
{
- u8 I, P, U, B, W, L;
- u8 Rn, Rd;
+ uint8_t I, P, U, B, W, L;
+ uint8_t Rn, Rd;
char *operation; /* "LDR" or "STR" */
char *suffix; /* "", "B", "T", "BT" */
char offset[32];
-
+
/* examine flags */
I = (opcode & 0x02000000) >> 25;
P = (opcode & 0x01000000) >> 24;
B = (opcode & 0x00400000) >> 22;
W = (opcode & 0x00200000) >> 21;
L = (opcode & 0x00100000) >> 20;
-
+
/* target register */
Rd = (opcode & 0xf000) >> 12;
-
+
/* base register */
Rn = (opcode & 0xf0000) >> 16;
-
+
instruction->info.load_store.Rd = Rd;
instruction->info.load_store.Rn = Rn;
instruction->info.load_store.U = U;
operation = "LDR";
else
operation = "STR";
-
+
/* determine instruction type and suffix */
if (B)
{
suffix = "";
}
}
-
+
if (!I) /* #+-<offset_12> */
{
- u32 offset_12 = (opcode & 0xfff);
- snprintf(offset, 32, "#%s0x%x", (U) ? "" : "-", offset_12);
-
+ uint32_t offset_12 = (opcode & 0xfff);
+ if (offset_12)
+ snprintf(offset, 32, ", #%s0x%" PRIx32 "", (U) ? "" : "-", offset_12);
+ else
+ snprintf(offset, 32, "%s", "");
+
instruction->info.load_store.offset_mode = 0;
instruction->info.load_store.offset.offset = offset_12;
}
else /* either +-<Rm> or +-<Rm>, <shift>, #<shift_imm> */
{
- u8 shift_imm, shift;
- u8 Rm;
-
+ uint8_t shift_imm, shift;
+ uint8_t Rm;
+
shift_imm = (opcode & 0xf80) >> 7;
shift = (opcode & 0x60) >> 5;
Rm = (opcode & 0xf);
-
+
/* LSR encodes a shift by 32 bit as 0x0 */
if ((shift == 0x1) && (shift_imm == 0x0))
shift_imm = 0x20;
-
+
/* ASR encodes a shift by 32 bit as 0x0 */
if ((shift == 0x2) && (shift_imm == 0x0))
shift_imm = 0x20;
/* ROR by 32 bit is actually a RRX */
if ((shift == 0x3) && (shift_imm == 0x0))
shift = 0x4;
-
+
instruction->info.load_store.offset_mode = 1;
instruction->info.load_store.offset.reg.Rm = Rm;
instruction->info.load_store.offset.reg.shift = shift;
if ((shift_imm == 0x0) && (shift == 0x0)) /* +-<Rm> */
{
- snprintf(offset, 32, "%sr%i", (U) ? "" : "-", Rm);
+ snprintf(offset, 32, ", %sr%i", (U) ? "" : "-", Rm);
}
else /* +-<Rm>, <Shift>, #<shift_imm> */
{
switch (shift)
{
case 0x0: /* LSL */
- snprintf(offset, 32, "%sr%i, LSL #0x%x", (U) ? "" : "-", Rm, shift_imm);
+ snprintf(offset, 32, ", %sr%i, LSL #0x%x", (U) ? "" : "-", Rm, shift_imm);
break;
case 0x1: /* LSR */
- snprintf(offset, 32, "%sr%i, LSR #0x%x", (U) ? "" : "-", Rm, shift_imm);
+ snprintf(offset, 32, ", %sr%i, LSR #0x%x", (U) ? "" : "-", Rm, shift_imm);
break;
case 0x2: /* ASR */
- snprintf(offset, 32, "%sr%i, ASR #0x%x", (U) ? "" : "-", Rm, shift_imm);
+ snprintf(offset, 32, ", %sr%i, ASR #0x%x", (U) ? "" : "-", Rm, shift_imm);
break;
case 0x3: /* ROR */
- snprintf(offset, 32, "%sr%i, ROR #0x%x", (U) ? "" : "-", Rm, shift_imm);
+ snprintf(offset, 32, ", %sr%i, ROR #0x%x", (U) ? "" : "-", Rm, shift_imm);
break;
case 0x4: /* RRX */
- snprintf(offset, 32, "%sr%i, RRX", (U) ? "" : "-", Rm);
+ snprintf(offset, 32, ", %sr%i, RRX", (U) ? "" : "-", Rm);
break;
}
}
}
-
+
if (P == 1)
{
if (W == 0) /* offset */
{
- snprintf(instruction->text, 128, "0x%8.8x\t0x%8.8x\t%s%s%s r%i, [r%i, %s]",
+ snprintf(instruction->text, 128, "0x%8.8" PRIx32 "\t0x%8.8" PRIx32 "\t%s%s%s r%i, [r%i%s]",
address, opcode, operation, COND(opcode), suffix,
Rd, Rn, offset);
-
+
instruction->info.load_store.index_mode = 0;
}
else /* pre-indexed */
{
- snprintf(instruction->text, 128, "0x%8.8x\t0x%8.8x\t%s%s%s r%i, [r%i, %s]!",
+ snprintf(instruction->text, 128, "0x%8.8" PRIx32 "\t0x%8.8" PRIx32 "\t%s%s%s r%i, [r%i%s]!",
address, opcode, operation, COND(opcode), suffix,
Rd, Rn, offset);
-
+
instruction->info.load_store.index_mode = 1;
}
}
else /* post-indexed */
{
- snprintf(instruction->text, 128, "0x%8.8x\t0x%8.8x\t%s%s%s r%i, [r%i], %s",
+ snprintf(instruction->text, 128, "0x%8.8" PRIx32 "\t0x%8.8" PRIx32 "\t%s%s%s r%i, [r%i]%s",
address, opcode, operation, COND(opcode), suffix,
Rd, Rn, offset);
-
+
instruction->info.load_store.index_mode = 2;
}
-
+
+ return ERROR_OK;
+}
+
+static int evaluate_extend(uint32_t opcode, uint32_t address, char *cp)
+{
+ unsigned rm = (opcode >> 0) & 0xf;
+ unsigned rd = (opcode >> 12) & 0xf;
+ unsigned rn = (opcode >> 16) & 0xf;
+ char *type, *rot;
+
+ switch ((opcode >> 24) & 0x3) {
+ case 0:
+ type = "B16";
+ break;
+ case 1:
+ sprintf(cp, "UNDEFINED");
+ return ARM_UNDEFINED_INSTRUCTION;
+ case 2:
+ type = "B";
+ break;
+ default:
+ type = "H";
+ break;
+ }
+
+ switch ((opcode >> 10) & 0x3) {
+ case 0:
+ rot = "";
+ break;
+ case 1:
+ rot = ", ROR #8";
+ break;
+ case 2:
+ rot = ", ROR #16";
+ break;
+ default:
+ rot = ", ROR #24";
+ break;
+ }
+
+ if (rn == 0xf) {
+ sprintf(cp, "%cXT%s%s\tr%d, r%d%s",
+ (opcode & (1 << 22)) ? 'U' : 'S',
+ type, COND(opcode),
+ rd, rm, rot);
+ return ARM_MOV;
+ } else {
+ sprintf(cp, "%cXTA%s%s\tr%d, r%d, r%d%s",
+ (opcode & (1 << 22)) ? 'U' : 'S',
+ type, COND(opcode),
+ rd, rn, rm, rot);
+ return ARM_ADD;
+ }
+}
+
+static int evaluate_p_add_sub(uint32_t opcode, uint32_t address, char *cp)
+{
+ char *prefix;
+ char *op;
+ int type;
+
+ switch ((opcode >> 20) & 0x7) {
+ case 1:
+ prefix = "S";
+ break;
+ case 2:
+ prefix = "Q";
+ break;
+ case 3:
+ prefix = "SH";
+ break;
+ case 5:
+ prefix = "U";
+ break;
+ case 6:
+ prefix = "UQ";
+ break;
+ case 7:
+ prefix = "UH";
+ break;
+ default:
+ goto undef;
+ }
+
+ switch ((opcode >> 5) & 0x7) {
+ case 0:
+ op = "ADD16";
+ type = ARM_ADD;
+ break;
+ case 1:
+ op = "ADDSUBX";
+ type = ARM_ADD;
+ break;
+ case 2:
+ op = "SUBADDX";
+ type = ARM_SUB;
+ break;
+ case 3:
+ op = "SUB16";
+ type = ARM_SUB;
+ break;
+ case 4:
+ op = "ADD8";
+ type = ARM_ADD;
+ break;
+ case 7:
+ op = "SUB8";
+ type = ARM_SUB;
+ break;
+ default:
+ goto undef;
+ }
+
+ sprintf(cp, "%s%s%s\tr%d, r%d, r%d", prefix, op, COND(opcode),
+ (int) (opcode >> 12) & 0xf,
+ (int) (opcode >> 16) & 0xf,
+ (int) (opcode >> 0) & 0xf);
+ return type;
+
+undef:
+ /* these opcodes might be used someday */
+ sprintf(cp, "UNDEFINED");
+ return ARM_UNDEFINED_INSTRUCTION;
+}
+
+/* ARMv6 and later support "media" instructions (includes SIMD) */
+static int evaluate_media(uint32_t opcode, uint32_t address,
+ struct arm_instruction *instruction)
+{
+ char *cp = instruction->text;
+ char *mnemonic = NULL;
+
+ sprintf(cp,
+ "0x%8.8" PRIx32 "\t0x%8.8" PRIx32 "\t",
+ address, opcode);
+ cp = strchr(cp, 0);
+
+ /* parallel add/subtract */
+ if ((opcode & 0x01800000) == 0x00000000) {
+ instruction->type = evaluate_p_add_sub(opcode, address, cp);
+ return ERROR_OK;
+ }
+
+ /* halfword pack */
+ if ((opcode & 0x01f00020) == 0x00800000) {
+ char *type, *shift;
+ unsigned imm = (unsigned) (opcode >> 7) & 0x1f;
+
+ if (opcode & (1 << 6)) {
+ type = "TB";
+ shift = "ASR";
+ if (imm == 0)
+ imm = 32;
+ } else {
+ type = "BT";
+ shift = "LSL";
+ }
+ sprintf(cp, "PKH%s%s\tr%d, r%d, r%d, %s #%d",
+ type, COND(opcode),
+ (int) (opcode >> 12) & 0xf,
+ (int) (opcode >> 16) & 0xf,
+ (int) (opcode >> 0) & 0xf,
+ shift, imm);
+ return ERROR_OK;
+ }
+
+ /* word saturate */
+ if ((opcode & 0x01a00020) == 0x00a00000) {
+ char *shift;
+ unsigned imm = (unsigned) (opcode >> 7) & 0x1f;
+
+ if (opcode & (1 << 6)) {
+ shift = "ASR";
+ if (imm == 0)
+ imm = 32;
+ } else {
+ shift = "LSL";
+ }
+
+ sprintf(cp, "%cSAT%s\tr%d, #%d, r%d, %s #%d",
+ (opcode & (1 << 22)) ? 'U' : 'S',
+ COND(opcode),
+ (int) (opcode >> 12) & 0xf,
+ (int) (opcode >> 16) & 0x1f,
+ (int) (opcode >> 0) & 0xf,
+ shift, imm);
+ return ERROR_OK;
+ }
+
+ /* sign extension */
+ if ((opcode & 0x018000f0) == 0x00800070) {
+ instruction->type = evaluate_extend(opcode, address, cp);
+ return ERROR_OK;
+ }
+
+ /* multiplies */
+ if ((opcode & 0x01f00080) == 0x01000000) {
+ unsigned rn = (opcode >> 12) & 0xf;
+
+ if (rn != 0xf)
+ sprintf(cp, "SML%cD%s%s\tr%d, r%d, r%d, r%d",
+ (opcode & (1 << 6)) ? 'S' : 'A',
+ (opcode & (1 << 5)) ? "X" : "",
+ COND(opcode),
+ (int) (opcode >> 16) & 0xf,
+ (int) (opcode >> 0) & 0xf,
+ (int) (opcode >> 8) & 0xf,
+ rn);
+ else
+ sprintf(cp, "SMU%cD%s%s\tr%d, r%d, r%d",
+ (opcode & (1 << 6)) ? 'S' : 'A',
+ (opcode & (1 << 5)) ? "X" : "",
+ COND(opcode),
+ (int) (opcode >> 16) & 0xf,
+ (int) (opcode >> 0) & 0xf,
+ (int) (opcode >> 8) & 0xf);
+ return ERROR_OK;
+ }
+ if ((opcode & 0x01f00000) == 0x01400000) {
+ sprintf(cp, "SML%cLD%s%s\tr%d, r%d, r%d, r%d",
+ (opcode & (1 << 6)) ? 'S' : 'A',
+ (opcode & (1 << 5)) ? "X" : "",
+ COND(opcode),
+ (int) (opcode >> 12) & 0xf,
+ (int) (opcode >> 16) & 0xf,
+ (int) (opcode >> 0) & 0xf,
+ (int) (opcode >> 8) & 0xf);
+ return ERROR_OK;
+ }
+ if ((opcode & 0x01f00000) == 0x01500000) {
+ unsigned rn = (opcode >> 12) & 0xf;
+
+ switch (opcode & 0xc0) {
+ case 3:
+ if (rn == 0xf)
+ goto undef;
+ /* FALL THROUGH */
+ case 0:
+ break;
+ default:
+ goto undef;
+ }
+
+ if (rn != 0xf)
+ sprintf(cp, "SMML%c%s%s\tr%d, r%d, r%d, r%d",
+ (opcode & (1 << 6)) ? 'S' : 'A',
+ (opcode & (1 << 5)) ? "R" : "",
+ COND(opcode),
+ (int) (opcode >> 16) & 0xf,
+ (int) (opcode >> 0) & 0xf,
+ (int) (opcode >> 8) & 0xf,
+ rn);
+ else
+ sprintf(cp, "SMMUL%s%s\tr%d, r%d, r%d",
+ (opcode & (1 << 5)) ? "R" : "",
+ COND(opcode),
+ (int) (opcode >> 16) & 0xf,
+ (int) (opcode >> 0) & 0xf,
+ (int) (opcode >> 8) & 0xf);
+ return ERROR_OK;
+ }
+
+
+ /* simple matches against the remaining decode bits */
+ switch (opcode & 0x01f000f0) {
+ case 0x00a00030:
+ case 0x00e00030:
+ /* parallel halfword saturate */
+ sprintf(cp, "%cSAT16%s\tr%d, #%d, r%d",
+ (opcode & (1 << 22)) ? 'U' : 'S',
+ COND(opcode),
+ (int) (opcode >> 12) & 0xf,
+ (int) (opcode >> 16) & 0xf,
+ (int) (opcode >> 0) & 0xf);
+ return ERROR_OK;
+ case 0x00b00030:
+ mnemonic = "REV";
+ break;
+ case 0x00b000b0:
+ mnemonic = "REV16";
+ break;
+ case 0x00f000b0:
+ mnemonic = "REVSH";
+ break;
+ case 0x008000b0:
+ /* select bytes */
+ sprintf(cp, "SEL%s\tr%d, r%d, r%d", COND(opcode),
+ (int) (opcode >> 12) & 0xf,
+ (int) (opcode >> 16) & 0xf,
+ (int) (opcode >> 0) & 0xf);
+ return ERROR_OK;
+ case 0x01800010:
+ /* unsigned sum of absolute differences */
+ if (((opcode >> 12) & 0xf) == 0xf)
+ sprintf(cp, "USAD8%s\tr%d, r%d, r%d", COND(opcode),
+ (int) (opcode >> 16) & 0xf,
+ (int) (opcode >> 0) & 0xf,
+ (int) (opcode >> 8) & 0xf);
+ else
+ sprintf(cp, "USADA8%s\tr%d, r%d, r%d, r%d", COND(opcode),
+ (int) (opcode >> 16) & 0xf,
+ (int) (opcode >> 0) & 0xf,
+ (int) (opcode >> 8) & 0xf,
+ (int) (opcode >> 12) & 0xf);
+ return ERROR_OK;
+ }
+ if (mnemonic) {
+ unsigned rm = (opcode >> 0) & 0xf;
+ unsigned rd = (opcode >> 12) & 0xf;
+
+ sprintf(cp, "%s%s\tr%d, r%d", mnemonic, COND(opcode), rm, rd);
+ return ERROR_OK;
+ }
+
+undef:
+ /* these opcodes might be used someday */
+ sprintf(cp, "UNDEFINED");
return ERROR_OK;
}
/* Miscellaneous load/store instructions */
-int evaluate_misc_load_store(u32 opcode, u32 address, arm_instruction_t *instruction)
+static int evaluate_misc_load_store(uint32_t opcode,
+ uint32_t address, struct arm_instruction *instruction)
{
- u8 P, U, I, W, L, S, H;
- u8 Rn, Rd;
+ uint8_t P, U, I, W, L, S, H;
+ uint8_t Rn, Rd;
char *operation; /* "LDR" or "STR" */
char *suffix; /* "H", "SB", "SH", "D" */
char offset[32];
-
+
/* examine flags */
P = (opcode & 0x01000000) >> 24;
U = (opcode & 0x00800000) >> 23;
L = (opcode & 0x00100000) >> 20;
S = (opcode & 0x00000040) >> 6;
H = (opcode & 0x00000020) >> 5;
-
+
/* target register */
Rd = (opcode & 0xf000) >> 12;
-
+
/* base register */
Rn = (opcode & 0xf0000) >> 16;
-
+
instruction->info.load_store.Rd = Rd;
instruction->info.load_store.Rn = Rn;
instruction->info.load_store.U = U;
-
+
/* determine instruction type and suffix */
if (S) /* signed */
{
instruction->type = ARM_STRH;
}
}
-
+
if (I) /* Immediate offset/index (#+-<offset_8>)*/
{
- u32 offset_8 = ((opcode & 0xf00) >> 4) | (opcode & 0xf);
- snprintf(offset, 32, "#%s0x%x", (U) ? "" : "-", offset_8);
-
+ uint32_t offset_8 = ((opcode & 0xf00) >> 4) | (opcode & 0xf);
+ snprintf(offset, 32, "#%s0x%" PRIx32 "", (U) ? "" : "-", offset_8);
+
instruction->info.load_store.offset_mode = 0;
instruction->info.load_store.offset.offset = offset_8;
}
else /* Register offset/index (+-<Rm>) */
{
- u8 Rm;
+ uint8_t Rm;
Rm = (opcode & 0xf);
snprintf(offset, 32, "%sr%i", (U) ? "" : "-", Rm);
-
+
instruction->info.load_store.offset_mode = 1;
instruction->info.load_store.offset.reg.Rm = Rm;
instruction->info.load_store.offset.reg.shift = 0x0;
instruction->info.load_store.offset.reg.shift_imm = 0x0;
}
-
+
if (P == 1)
{
if (W == 0) /* offset */
{
- snprintf(instruction->text, 128, "0x%8.8x\t0x%8.8x\t%s%s%s r%i, [r%i, %s]",
+ snprintf(instruction->text, 128, "0x%8.8" PRIx32 "\t0x%8.8" PRIx32 "\t%s%s%s r%i, [r%i, %s]",
address, opcode, operation, COND(opcode), suffix,
Rd, Rn, offset);
-
+
instruction->info.load_store.index_mode = 0;
}
else /* pre-indexed */
{
- snprintf(instruction->text, 128, "0x%8.8x\t0x%8.8x\t%s%s%s r%i, [r%i, %s]!",
+ snprintf(instruction->text, 128, "0x%8.8" PRIx32 "\t0x%8.8" PRIx32 "\t%s%s%s r%i, [r%i, %s]!",
address, opcode, operation, COND(opcode), suffix,
Rd, Rn, offset);
-
+
instruction->info.load_store.index_mode = 1;
}
}
else /* post-indexed */
{
- snprintf(instruction->text, 128, "0x%8.8x\t0x%8.8x\t%s%s%s r%i, [r%i], %s",
+ snprintf(instruction->text, 128, "0x%8.8" PRIx32 "\t0x%8.8" PRIx32 "\t%s%s%s r%i, [r%i], %s",
address, opcode, operation, COND(opcode), suffix,
Rd, Rn, offset);
-
+
instruction->info.load_store.index_mode = 2;
}
-
+
return ERROR_OK;
}
/* Load/store multiples instructions */
-int evaluate_ldm_stm(u32 opcode, u32 address, arm_instruction_t *instruction)
+static int evaluate_ldm_stm(uint32_t opcode,
+ uint32_t address, struct arm_instruction *instruction)
{
- u8 P, U, S, W, L, Rn;
- u32 register_list;
+ uint8_t P, U, S, W, L, Rn;
+ uint32_t register_list;
char *addressing_mode;
char *mnemonic;
char reg_list[69];
char *reg_list_p;
int i;
int first_reg = 1;
-
+
P = (opcode & 0x01000000) >> 24;
U = (opcode & 0x00800000) >> 23;
S = (opcode & 0x00400000) >> 22;
L = (opcode & 0x00100000) >> 20;
register_list = (opcode & 0xffff);
Rn = (opcode & 0xf0000) >> 16;
-
+
instruction->info.load_store_multiple.Rn = Rn;
instruction->info.load_store_multiple.register_list = register_list;
instruction->info.load_store_multiple.S = S;
instruction->info.load_store_multiple.W = W;
-
+
if (L)
{
instruction->type = ARM_LDM;
instruction->type = ARM_STM;
mnemonic = "STM";
}
-
+
if (P)
{
if (U)
if (U)
{
instruction->info.load_store_multiple.addressing_mode = 0;
- addressing_mode = "IA";
+ /* "IA" is the default in UAL syntax */
+ addressing_mode = "";
}
else
{
addressing_mode = "DA";
}
}
-
+
reg_list_p = reg_list;
for (i = 0; i <= 15; i++)
{
}
}
}
-
- snprintf(instruction->text, 128, "0x%8.8x\t0x%8.8x\t%s%s%s r%i%s, {%s}%s",
- address, opcode, mnemonic, COND(opcode), addressing_mode,
+
+ snprintf(instruction->text, 128,
+ "0x%8.8" PRIx32 "\t0x%8.8" PRIx32
+ "\t%s%s%s r%i%s, {%s}%s",
+ address, opcode,
+ mnemonic, addressing_mode, COND(opcode),
Rn, (W) ? "!" : "", reg_list, (S) ? "^" : "");
-
+
return ERROR_OK;
}
/* Multiplies, extra load/stores */
-int evaluate_mul_and_extra_ld_st(u32 opcode, u32 address, arm_instruction_t *instruction)
+static int evaluate_mul_and_extra_ld_st(uint32_t opcode,
+ uint32_t address, struct arm_instruction *instruction)
{
/* Multiply (accumulate) (long) and Swap/swap byte */
if ((opcode & 0x000000f0) == 0x00000090)
/* Multiply (accumulate) */
if ((opcode & 0x0f800000) == 0x00000000)
{
- u8 Rm, Rs, Rn, Rd, S;
+ uint8_t Rm, Rs, Rn, Rd, S;
Rm = opcode & 0xf;
Rs = (opcode & 0xf00) >> 8;
Rn = (opcode & 0xf000) >> 12;
Rd = (opcode & 0xf0000) >> 16;
S = (opcode & 0x00100000) >> 20;
-
+
/* examine A bit (accumulate) */
if (opcode & 0x00200000)
{
instruction->type = ARM_MLA;
- snprintf(instruction->text, 128, "0x%8.8x\t0x%8.8x\tMLA%s%s r%i, r%i, r%i, r%i",
+ snprintf(instruction->text, 128, "0x%8.8" PRIx32 "\t0x%8.8" PRIx32 "\tMLA%s%s r%i, r%i, r%i, r%i",
address, opcode, COND(opcode), (S) ? "S" : "", Rd, Rm, Rs, Rn);
}
else
{
instruction->type = ARM_MUL;
- snprintf(instruction->text, 128, "0x%8.8x\t0x%8.8x\tMUL%s%s r%i, r%i, r%i",
+ snprintf(instruction->text, 128, "0x%8.8" PRIx32 "\t0x%8.8" PRIx32 "\tMUL%s%s r%i, r%i, r%i",
address, opcode, COND(opcode), (S) ? "S" : "", Rd, Rm, Rs);
}
-
+
return ERROR_OK;
}
-
+
/* Multiply (accumulate) long */
if ((opcode & 0x0f800000) == 0x00800000)
{
- char* mnemonic;
- u8 Rm, Rs, RdHi, RdLow, S;
+ char* mnemonic = NULL;
+ uint8_t Rm, Rs, RdHi, RdLow, S;
Rm = opcode & 0xf;
Rs = (opcode & 0xf00) >> 8;
RdHi = (opcode & 0xf000) >> 12;
RdLow = (opcode & 0xf0000) >> 16;
S = (opcode & 0x00100000) >> 20;
-
+
switch ((opcode & 0x00600000) >> 21)
{
case 0x0:
mnemonic = "SMLAL";
break;
}
-
- snprintf(instruction->text, 128, "0x%8.8x\t0x%8.8x\t%s%s%s r%i, r%i, r%i, r%i",
+
+ snprintf(instruction->text, 128, "0x%8.8" PRIx32 "\t0x%8.8" PRIx32 "\t%s%s%s r%i, r%i, r%i, r%i",
address, opcode, mnemonic, COND(opcode), (S) ? "S" : "",
RdLow, RdHi, Rm, Rs);
-
+
return ERROR_OK;
}
-
+
/* Swap/swap byte */
if ((opcode & 0x0f800000) == 0x01000000)
{
- u8 Rm, Rd, Rn;
+ uint8_t Rm, Rd, Rn;
Rm = opcode & 0xf;
Rd = (opcode & 0xf000) >> 12;
Rn = (opcode & 0xf0000) >> 16;
-
+
/* examine B flag */
instruction->type = (opcode & 0x00400000) ? ARM_SWPB : ARM_SWP;
-
- snprintf(instruction->text, 128, "0x%8.8x\t0x%8.8x\t%s%s r%i, r%i, [r%i]",
+
+ snprintf(instruction->text, 128, "0x%8.8" PRIx32 "\t0x%8.8" PRIx32 "\t%s%s r%i, r%i, [r%i]",
address, opcode, (opcode & 0x00400000) ? "SWPB" : "SWP", COND(opcode), Rd, Rm, Rn);
return ERROR_OK;
}
-
+
}
-
+
return evaluate_misc_load_store(opcode, address, instruction);
}
-int evaluate_mrs_msr(u32 opcode, u32 address, arm_instruction_t *instruction)
+static int evaluate_mrs_msr(uint32_t opcode,
+ uint32_t address, struct arm_instruction *instruction)
{
int R = (opcode & 0x00400000) >> 22;
char *PSR = (R) ? "SPSR" : "CPSR";
-
+
/* Move register to status register (MSR) */
if (opcode & 0x00200000)
{
instruction->type = ARM_MSR;
-
+
/* immediate variant */
if (opcode & 0x02000000)
{
- u8 immediate = (opcode & 0xff);
- u8 rotate = (opcode & 0xf00);
-
- snprintf(instruction->text, 128, "0x%8.8x\t0x%8.8x\tMSR%s %s_%s%s%s%s, 0x%8.8x",
+ uint8_t immediate = (opcode & 0xff);
+ uint8_t rotate = (opcode & 0xf00);
+
+ snprintf(instruction->text, 128, "0x%8.8" PRIx32 "\t0x%8.8" PRIx32 "\tMSR%s %s_%s%s%s%s, 0x%8.8" PRIx32 ,
address, opcode, COND(opcode), PSR,
(opcode & 0x10000) ? "c" : "",
(opcode & 0x20000) ? "x" : "",
(opcode & 0x40000) ? "s" : "",
(opcode & 0x80000) ? "f" : "",
ror(immediate, (rotate * 2))
- );
+);
}
else /* register variant */
{
- u8 Rm = opcode & 0xf;
- snprintf(instruction->text, 128, "0x%8.8x\t0x%8.8x\tMSR%s %s_%s%s%s%s, r%i",
+ uint8_t Rm = opcode & 0xf;
+ snprintf(instruction->text, 128, "0x%8.8" PRIx32 "\t0x%8.8" PRIx32 "\tMSR%s %s_%s%s%s%s, r%i",
address, opcode, COND(opcode), PSR,
(opcode & 0x10000) ? "c" : "",
(opcode & 0x20000) ? "x" : "",
(opcode & 0x40000) ? "s" : "",
(opcode & 0x80000) ? "f" : "",
Rm
- );
+);
}
-
+
}
else /* Move status register to register (MRS) */
{
- u8 Rd;
-
+ uint8_t Rd;
+
instruction->type = ARM_MRS;
Rd = (opcode & 0x0000f000) >> 12;
-
- snprintf(instruction->text, 128, "0x%8.8x\t0x%8.8x\tMRS%s r%i, %s",
+
+ snprintf(instruction->text, 128, "0x%8.8" PRIx32 "\t0x%8.8" PRIx32 "\tMRS%s r%i, %s",
address, opcode, COND(opcode), Rd, PSR);
}
-
+
return ERROR_OK;
}
/* Miscellaneous instructions */
-int evaluate_misc_instr(u32 opcode, u32 address, arm_instruction_t *instruction)
+static int evaluate_misc_instr(uint32_t opcode,
+ uint32_t address, struct arm_instruction *instruction)
{
/* MRS/MSR */
if ((opcode & 0x000000f0) == 0x00000000)
{
evaluate_mrs_msr(opcode, address, instruction);
}
-
+
/* BX */
if ((opcode & 0x006000f0) == 0x00200010)
{
- u8 Rm;
+ uint8_t Rm;
+ instruction->type = ARM_BX;
+ Rm = opcode & 0xf;
+
+ snprintf(instruction->text, 128, "0x%8.8" PRIx32 "\t0x%8.8" PRIx32 "\tBX%s r%i",
+ address, opcode, COND(opcode), Rm);
+
+ instruction->info.b_bl_bx_blx.reg_operand = Rm;
+ instruction->info.b_bl_bx_blx.target_address = -1;
+ }
+
+ /* BXJ - "Jazelle" support (ARMv5-J) */
+ if ((opcode & 0x006000f0) == 0x00200020)
+ {
+ uint8_t Rm;
instruction->type = ARM_BX;
Rm = opcode & 0xf;
-
- snprintf(instruction->text, 128, "0x%8.8x\t0x%8.8x\tBX%s r%i",
+
+ snprintf(instruction->text, 128,
+ "0x%8.8" PRIx32 "\t0x%8.8" PRIx32 "\tBXJ%s r%i",
address, opcode, COND(opcode), Rm);
-
+
instruction->info.b_bl_bx_blx.reg_operand = Rm;
instruction->info.b_bl_bx_blx.target_address = -1;
}
-
+
/* CLZ */
- if ((opcode & 0x0060000f0) == 0x00300010)
+ if ((opcode & 0x006000f0) == 0x00600010)
{
- u8 Rm, Rd;
+ uint8_t Rm, Rd;
instruction->type = ARM_CLZ;
Rm = opcode & 0xf;
Rd = (opcode & 0xf000) >> 12;
- snprintf(instruction->text, 128, "0x%8.8x\t0x%8.8x\tCLZ%s r%i, r%i",
+ snprintf(instruction->text, 128, "0x%8.8" PRIx32 "\t0x%8.8" PRIx32 "\tCLZ%s r%i, r%i",
address, opcode, COND(opcode), Rd, Rm);
}
-
- /* BLX */
- if ((opcode & 0x0060000f0) == 0x00200030)
+
+ /* BLX(2) */
+ if ((opcode & 0x006000f0) == 0x00200030)
{
- u8 Rm;
+ uint8_t Rm;
instruction->type = ARM_BLX;
Rm = opcode & 0xf;
-
- snprintf(instruction->text, 128, "0x%8.8x\t0x%8.8x\tBLX%s r%i",
+
+ snprintf(instruction->text, 128, "0x%8.8" PRIx32 "\t0x%8.8" PRIx32 "\tBLX%s r%i",
address, opcode, COND(opcode), Rm);
+
+ instruction->info.b_bl_bx_blx.reg_operand = Rm;
+ instruction->info.b_bl_bx_blx.target_address = -1;
}
-
+
/* Enhanced DSP add/subtracts */
if ((opcode & 0x0000000f0) == 0x00000050)
{
- u8 Rm, Rd, Rn;
- char *mnemonic;
+ uint8_t Rm, Rd, Rn;
+ char *mnemonic = NULL;
Rm = opcode & 0xf;
Rd = (opcode & 0xf000) >> 12;
Rn = (opcode & 0xf0000) >> 16;
-
+
switch ((opcode & 0x00600000) >> 21)
{
case 0x0:
mnemonic = "QDSUB";
break;
}
-
- snprintf(instruction->text, 128, "0x%8.8x\t0x%8.8x\t%s%s r%i, r%i, r%i",
+
+ snprintf(instruction->text, 128, "0x%8.8" PRIx32 "\t0x%8.8" PRIx32 "\t%s%s r%i, r%i, r%i",
address, opcode, mnemonic, COND(opcode), Rd, Rm, Rn);
}
-
+
/* Software breakpoints */
if ((opcode & 0x0000000f0) == 0x00000070)
{
- u32 immediate;
+ uint32_t immediate;
instruction->type = ARM_BKPT;
immediate = ((opcode & 0x000fff00) >> 4) | (opcode & 0xf);
-
- snprintf(instruction->text, 128, "0x%8.8x\t0x%8.8x\tBKPT 0x%4.4x",
- address, opcode, immediate);
+
+ snprintf(instruction->text, 128, "0x%8.8" PRIx32 "\t0x%8.8" PRIx32 "\tBKPT 0x%4.4" PRIx32 "",
+ address, opcode, immediate);
}
-
+
/* Enhanced DSP multiplies */
if ((opcode & 0x000000090) == 0x00000080)
{
int x = (opcode & 0x20) >> 5;
int y = (opcode & 0x40) >> 6;
-
- /* SMLA<x><y> */
+
+ /* SMLA < x><y> */
if ((opcode & 0x00600000) == 0x00000000)
{
- u8 Rd, Rm, Rs, Rn;
+ uint8_t Rd, Rm, Rs, Rn;
instruction->type = ARM_SMLAxy;
Rd = (opcode & 0xf0000) >> 16;
Rm = (opcode & 0xf);
Rs = (opcode & 0xf00) >> 8;
Rn = (opcode & 0xf000) >> 12;
-
- snprintf(instruction->text, 128, "0x%8.8x\t0x%8.8x\tSMLA%s%s%s r%i, r%i, r%i, r%i",
+
+ snprintf(instruction->text, 128, "0x%8.8" PRIx32 "\t0x%8.8" PRIx32 "\tSMLA%s%s%s r%i, r%i, r%i, r%i",
address, opcode, (x) ? "T" : "B", (y) ? "T" : "B", COND(opcode),
Rd, Rm, Rs, Rn);
}
-
- /* SMLAL<x><y> */
+
+ /* SMLAL < x><y> */
if ((opcode & 0x00600000) == 0x00400000)
{
- u8 RdLow, RdHi, Rm, Rs;
+ uint8_t RdLow, RdHi, Rm, Rs;
instruction->type = ARM_SMLAxy;
RdHi = (opcode & 0xf0000) >> 16;
RdLow = (opcode & 0xf000) >> 12;
Rm = (opcode & 0xf);
Rs = (opcode & 0xf00) >> 8;
-
- snprintf(instruction->text, 128, "0x%8.8x\t0x%8.8x\tSMLA%s%s%s r%i, r%i, r%i, r%i",
+
+ snprintf(instruction->text, 128, "0x%8.8" PRIx32 "\t0x%8.8" PRIx32 "\tSMLA%s%s%s r%i, r%i, r%i, r%i",
address, opcode, (x) ? "T" : "B", (y) ? "T" : "B", COND(opcode),
RdLow, RdHi, Rm, Rs);
}
-
- /* SMLAW<y> */
+
+ /* SMLAW < y> */
if (((opcode & 0x00600000) == 0x00100000) && (x == 0))
{
- u8 Rd, Rm, Rs, Rn;
+ uint8_t Rd, Rm, Rs, Rn;
instruction->type = ARM_SMLAWy;
Rd = (opcode & 0xf0000) >> 16;
Rm = (opcode & 0xf);
Rs = (opcode & 0xf00) >> 8;
Rn = (opcode & 0xf000) >> 12;
- snprintf(instruction->text, 128, "0x%8.8x\t0x%8.8x\tSMLAW%s%s r%i, r%i, r%i, r%i",
+ snprintf(instruction->text, 128, "0x%8.8" PRIx32 "\t0x%8.8" PRIx32 "\tSMLAW%s%s r%i, r%i, r%i, r%i",
address, opcode, (y) ? "T" : "B", COND(opcode),
Rd, Rm, Rs, Rn);
}
-
- /* SMUL<x><y> */
+
+ /* SMUL < x><y> */
if ((opcode & 0x00600000) == 0x00300000)
{
- u8 Rd, Rm, Rs;
+ uint8_t Rd, Rm, Rs;
instruction->type = ARM_SMULxy;
Rd = (opcode & 0xf0000) >> 16;
Rm = (opcode & 0xf);
Rs = (opcode & 0xf00) >> 8;
-
- snprintf(instruction->text, 128, "0x%8.8x\t0x%8.8x\tSMULW%s%s%s r%i, r%i, r%i",
+
+ snprintf(instruction->text, 128, "0x%8.8" PRIx32 "\t0x%8.8" PRIx32 "\tSMULW%s%s%s r%i, r%i, r%i",
address, opcode, (x) ? "T" : "B", (y) ? "T" : "B", COND(opcode),
Rd, Rm, Rs);
}
-
- /* SMULW<y> */
+
+ /* SMULW < y> */
if (((opcode & 0x00600000) == 0x00100000) && (x == 1))
{
- u8 Rd, Rm, Rs;
+ uint8_t Rd, Rm, Rs;
instruction->type = ARM_SMULWy;
Rd = (opcode & 0xf0000) >> 16;
Rm = (opcode & 0xf);
Rs = (opcode & 0xf00) >> 8;
-
- snprintf(instruction->text, 128, "0x%8.8x\t0x%8.8x\tSMULW%s%s r%i, r%i, r%i",
+
+ snprintf(instruction->text, 128, "0x%8.8" PRIx32 "\t0x%8.8" PRIx32 "\tSMULW%s%s r%i, r%i, r%i",
address, opcode, (y) ? "T" : "B", COND(opcode),
Rd, Rm, Rs);
}
}
-
+
return ERROR_OK;
}
-int evaluate_data_proc(u32 opcode, u32 address, arm_instruction_t *instruction)
+static int evaluate_data_proc(uint32_t opcode,
+ uint32_t address, struct arm_instruction *instruction)
{
- u8 I, op, S, Rn, Rd;
- char *mnemonic;
+ uint8_t I, op, S, Rn, Rd;
+ char *mnemonic = NULL;
char shifter_operand[32];
-
+
I = (opcode & 0x02000000) >> 25;
op = (opcode & 0x01e00000) >> 21;
S = (opcode & 0x00100000) >> 20;
-
+
Rd = (opcode & 0xf000) >> 12;
Rn = (opcode & 0xf0000) >> 16;
-
+
instruction->info.data_proc.Rd = Rd;
instruction->info.data_proc.Rn = Rn;
instruction->info.data_proc.S = S;
mnemonic = "MVN";
break;
}
-
+
if (I) /* immediate shifter operand (#<immediate>)*/
{
- u8 immed_8 = opcode & 0xff;
- u8 rotate_imm = (opcode & 0xf00) >> 8;
- u32 immediate;
-
+ uint8_t immed_8 = opcode & 0xff;
+ uint8_t rotate_imm = (opcode & 0xf00) >> 8;
+ uint32_t immediate;
+
immediate = ror(immed_8, rotate_imm * 2);
-
- snprintf(shifter_operand, 32, "#0x%x", immediate);
-
+
+ snprintf(shifter_operand, 32, "#0x%" PRIx32 "", immediate);
+
instruction->info.data_proc.variant = 0;
instruction->info.data_proc.shifter_operand.immediate.immediate = immediate;
}
else /* register-based shifter operand */
{
- u8 shift, Rm;
+ uint8_t shift, Rm;
shift = (opcode & 0x60) >> 5;
Rm = (opcode & 0xf);
-
+
if ((opcode & 0x10) != 0x10) /* Immediate shifts ("<Rm>" or "<Rm>, <shift> #<shift_immediate>") */
{
- u8 shift_imm;
+ uint8_t shift_imm;
shift_imm = (opcode & 0xf80) >> 7;
instruction->info.data_proc.variant = 1;
instruction->info.data_proc.shifter_operand.immediate_shift.Rm = Rm;
instruction->info.data_proc.shifter_operand.immediate_shift.shift_imm = shift_imm;
instruction->info.data_proc.shifter_operand.immediate_shift.shift = shift;
-
+
+ /* LSR encodes a shift by 32 bit as 0x0 */
+ if ((shift == 0x1) && (shift_imm == 0x0))
+ shift_imm = 0x20;
+
+ /* ASR encodes a shift by 32 bit as 0x0 */
+ if ((shift == 0x2) && (shift_imm == 0x0))
+ shift_imm = 0x20;
+
+ /* ROR by 32 bit is actually a RRX */
+ if ((shift == 0x3) && (shift_imm == 0x0))
+ shift = 0x4;
+
if ((shift_imm == 0x0) && (shift == 0x0))
{
snprintf(shifter_operand, 32, "r%i", Rm);
}
else if (shift == 0x1) /* LSR */
{
- if (shift_imm == 0x0)
- shift_imm = 0x32;
snprintf(shifter_operand, 32, "r%i, LSR #0x%x", Rm, shift_imm);
}
else if (shift == 0x2) /* ASR */
{
- if (shift_imm == 0x0)
- shift_imm = 0x32;
snprintf(shifter_operand, 32, "r%i, ASR #0x%x", Rm, shift_imm);
}
- else if (shift == 0x3) /* ROR or RRX */
+ else if (shift == 0x3) /* ROR */
{
- if (shift_imm == 0x0) /* RRX */
- snprintf(shifter_operand, 32, "r%i, RRX", Rm);
- else
- snprintf(shifter_operand, 32, "r%i, ROR #0x%x", Rm, shift_imm);
+ snprintf(shifter_operand, 32, "r%i, ROR #0x%x", Rm, shift_imm);
+ }
+ else if (shift == 0x4) /* RRX */
+ {
+ snprintf(shifter_operand, 32, "r%i, RRX", Rm);
}
}
}
else /* Register shifts ("<Rm>, <shift> <Rs>") */
{
- u8 Rs = (opcode & 0xf00) >> 8;
-
+ uint8_t Rs = (opcode & 0xf00) >> 8;
+
instruction->info.data_proc.variant = 2;
instruction->info.data_proc.shifter_operand.register_shift.Rm = Rm;
instruction->info.data_proc.shifter_operand.register_shift.Rs = Rs;
instruction->info.data_proc.shifter_operand.register_shift.shift = shift;
-
+
if (shift == 0x0) /* LSL */
{
snprintf(shifter_operand, 32, "r%i, LSL r%i", Rm, Rs);
{
snprintf(shifter_operand, 32, "r%i, ASR r%i", Rm, Rs);
}
- else if (shift == 0x3) /* ROR or RRX */
+ else if (shift == 0x3) /* ROR */
{
snprintf(shifter_operand, 32, "r%i, ROR r%i", Rm, Rs);
}
}
}
-
+
if ((op < 0x8) || (op == 0xc) || (op == 0xe)) /* <opcode3>{<cond>}{S} <Rd>, <Rn>, <shifter_operand> */
{
- snprintf(instruction->text, 128, "0x%8.8x\t0x%8.8x\t%s%s%s r%i, r%i, %s",
+ snprintf(instruction->text, 128, "0x%8.8" PRIx32 "\t0x%8.8" PRIx32 "\t%s%s%s r%i, r%i, %s",
address, opcode, mnemonic, COND(opcode),
(S) ? "S" : "", Rd, Rn, shifter_operand);
}
else if ((op == 0xd) || (op == 0xf)) /* <opcode1>{<cond>}{S} <Rd>, <shifter_operand> */
{
- snprintf(instruction->text, 128, "0x%8.8x\t0x%8.8x\t%s%s%s r%i, %s",
+ if (opcode == 0xe1a00000) /* print MOV r0,r0 as NOP */
+ snprintf(instruction->text, 128, "0x%8.8" PRIx32 "\t0x%8.8" PRIx32 "\tNOP",address, opcode);
+ else
+ snprintf(instruction->text, 128, "0x%8.8" PRIx32 "\t0x%8.8" PRIx32 "\t%s%s%s r%i, %s",
address, opcode, mnemonic, COND(opcode),
(S) ? "S" : "", Rd, shifter_operand);
}
else /* <opcode2>{<cond>} <Rn>, <shifter_operand> */
{
- snprintf(instruction->text, 128, "0x%8.8x\t0x%8.8x\t%s%s r%i, %s",
+ snprintf(instruction->text, 128, "0x%8.8" PRIx32 "\t0x%8.8" PRIx32 "\t%s%s r%i, %s",
address, opcode, mnemonic, COND(opcode),
Rn, shifter_operand);
}
-
+
return ERROR_OK;
}
-
-int evaluate_opcode(u32 opcode, u32 address, arm_instruction_t *instruction)
+
+int arm_evaluate_opcode(uint32_t opcode, uint32_t address,
+ struct arm_instruction *instruction)
{
/* clear fields, to avoid confusion */
- memset(instruction, 0, sizeof(arm_instruction_t));
+ memset(instruction, 0, sizeof(struct arm_instruction));
instruction->opcode = opcode;
-
+ instruction->instruction_size = 4;
+
/* catch opcodes with condition field [31:28] = b1111 */
if ((opcode & 0xf0000000) == 0xf0000000)
{
/* Undefined instruction (or ARMv5E cache preload PLD) */
if ((opcode & 0x08000000) == 0x00000000)
return evaluate_pld(opcode, address, instruction);
-
- /* Undefined instruction */
+
+ /* Undefined instruction (or ARMv6+ SRS/RFE) */
if ((opcode & 0x0e000000) == 0x08000000)
- {
- instruction->type = ARM_UNDEFINED_INSTRUCTION;
- snprintf(instruction->text, 128, "0x%8.8x\t0x%8.8x\tUNDEFINED INSTRUCTION", address, opcode);
- return ERROR_OK;
- }
-
+ return evaluate_srs(opcode, address, instruction);
+
/* Branch and branch with link and change to Thumb */
if ((opcode & 0x0e000000) == 0x0a000000)
return evaluate_blx_imm(opcode, address, instruction);
-
- /* Extended coprocessor opcode space (ARMv5 and higher )*/
+
+ /* Extended coprocessor opcode space (ARMv5 and higher)*/
/* Coprocessor load/store and double register transfers */
if ((opcode & 0x0e000000) == 0x0c000000)
return evaluate_ldc_stc_mcrr_mrrc(opcode, address, instruction);
-
+
/* Coprocessor data processing */
if ((opcode & 0x0f000100) == 0x0c000000)
return evaluate_cdp_mcr_mrc(opcode, address, instruction);
-
+
/* Coprocessor register transfers */
if ((opcode & 0x0f000010) == 0x0c000010)
return evaluate_cdp_mcr_mrc(opcode, address, instruction);
-
+
/* Undefined instruction */
if ((opcode & 0x0f000000) == 0x0f000000)
{
instruction->type = ARM_UNDEFINED_INSTRUCTION;
- snprintf(instruction->text, 128, "0x%8.8x\t0x%8.8x\tUNDEFINED INSTRUCTION", address, opcode);
+ snprintf(instruction->text, 128, "0x%8.8" PRIx32 "\t0x%8.8" PRIx32 "\tUNDEFINED INSTRUCTION", address, opcode);
return ERROR_OK;
}
}
-
+
/* catch opcodes with [27:25] = b000 */
if ((opcode & 0x0e000000) == 0x00000000)
{
/* Multiplies, extra load/stores */
if ((opcode & 0x00000090) == 0x00000090)
return evaluate_mul_and_extra_ld_st(opcode, address, instruction);
-
+
/* Miscellaneous instructions */
if ((opcode & 0x0f900000) == 0x01000000)
return evaluate_misc_instr(opcode, address, instruction);
-
+
return evaluate_data_proc(opcode, address, instruction);
}
-
+
/* catch opcodes with [27:25] = b001 */
if ((opcode & 0x0e000000) == 0x02000000)
{
if ((opcode & 0x0fb00000) == 0x03000000)
{
instruction->type = ARM_UNDEFINED_INSTRUCTION;
- snprintf(instruction->text, 128, "0x%8.8x\t0x%8.8x\tUNDEFINED INSTRUCTION", address, opcode);
+ snprintf(instruction->text, 128, "0x%8.8" PRIx32 "\t0x%8.8" PRIx32 "\tUNDEFINED INSTRUCTION", address, opcode);
return ERROR_OK;
}
-
+
/* Move immediate to status register */
if ((opcode & 0x0fb00000) == 0x03200000)
return evaluate_mrs_msr(opcode, address, instruction);
-
+
return evaluate_data_proc(opcode, address, instruction);
}
-
+
/* catch opcodes with [27:25] = b010 */
if ((opcode & 0x0e000000) == 0x04000000)
{
/* Load/store immediate offset */
return evaluate_load_store(opcode, address, instruction);
}
-
+
/* catch opcodes with [27:25] = b011 */
- if ((opcode & 0x0e000000) == 0x04000000)
+ if ((opcode & 0x0e000000) == 0x06000000)
{
- /* Undefined instruction */
- if ((opcode & 0x00000010) == 0x00000010)
+ /* Load/store register offset */
+ if ((opcode & 0x00000010) == 0x00000000)
+ return evaluate_load_store(opcode, address, instruction);
+
+ /* Architecturally Undefined instruction
+ * ... don't expect these to ever be used
+ */
+ if ((opcode & 0x07f000f0) == 0x07f000f0)
{
instruction->type = ARM_UNDEFINED_INSTRUCTION;
- snprintf(instruction->text, 128, "0x%8.8x\t0x%8.8x\tUNDEFINED INSTRUCTION", address, opcode);
+ snprintf(instruction->text, 128,
+ "0x%8.8" PRIx32 "\t0x%8.8" PRIx32 "\tUNDEF",
+ address, opcode);
return ERROR_OK;
}
-
- /* Load/store register offset */
- return evaluate_load_store(opcode, address, instruction);
+ /* "media" instructions */
+ return evaluate_media(opcode, address, instruction);
}
-
+
/* catch opcodes with [27:25] = b100 */
if ((opcode & 0x0e000000) == 0x08000000)
{
/* Load/store multiple */
return evaluate_ldm_stm(opcode, address, instruction);
}
-
+
/* catch opcodes with [27:25] = b101 */
if ((opcode & 0x0e000000) == 0x0a000000)
{
/* Branch and branch with link */
return evaluate_b_bl(opcode, address, instruction);
}
-
+
/* catch opcodes with [27:25] = b110 */
- if ((opcode & 0x0e000000) == 0x0a000000)
+ if ((opcode & 0x0e000000) == 0x0c000000)
{
/* Coprocessor load/store and double register transfers */
return evaluate_ldc_stc_mcrr_mrrc(opcode, address, instruction);
}
-
+
/* catch opcodes with [27:25] = b111 */
if ((opcode & 0x0e000000) == 0x0e000000)
{
/* Software interrupt */
if ((opcode & 0x0f000000) == 0x0f000000)
return evaluate_swi(opcode, address, instruction);
-
+
/* Coprocessor data processing */
if ((opcode & 0x0f000010) == 0x0e000000)
return evaluate_cdp_mcr_mrc(opcode, address, instruction);
-
+
/* Coprocessor register transfers */
if ((opcode & 0x0f000010) == 0x0e000010)
return evaluate_cdp_mcr_mrc(opcode, address, instruction);
}
-
- ERROR("should never reach this point");
+
+ LOG_ERROR("ARM: should never reach this point (opcode=%08x)",
+ (unsigned) opcode);
return -1;
}
+
+static int evaluate_b_bl_blx_thumb(uint16_t opcode,
+ uint32_t address, struct arm_instruction *instruction)
+{
+ uint32_t offset = opcode & 0x7ff;
+ uint32_t opc = (opcode >> 11) & 0x3;
+ uint32_t target_address;
+ char *mnemonic = NULL;
+
+ /* sign extend 11-bit offset */
+ if (((opc == 0) || (opc == 2)) && (offset & 0x00000400))
+ offset = 0xfffff800 | offset;
+
+ target_address = address + 4 + (offset << 1);
+
+ switch (opc)
+ {
+ /* unconditional branch */
+ case 0:
+ instruction->type = ARM_B;
+ mnemonic = "B";
+ break;
+ /* BLX suffix */
+ case 1:
+ instruction->type = ARM_BLX;
+ mnemonic = "BLX";
+ target_address &= 0xfffffffc;
+ break;
+ /* BL/BLX prefix */
+ case 2:
+ instruction->type = ARM_UNKNOWN_INSTUCTION;
+ mnemonic = "prefix";
+ target_address = offset << 12;
+ break;
+ /* BL suffix */
+ case 3:
+ instruction->type = ARM_BL;
+ mnemonic = "BL";
+ break;
+ }
+
+ /* TODO: deal correctly with dual opcode (prefixed) BL/BLX;
+ * these are effectively 32-bit instructions even in Thumb1. For
+ * disassembly, it's simplest to always use the Thumb2 decoder.
+ *
+ * But some cores will evidently handle them as two instructions,
+ * where exceptions may occur between the two. The ETMv3.2+ ID
+ * register has a bit which exposes this behavior.
+ */
+
+ snprintf(instruction->text, 128,
+ "0x%8.8" PRIx32 " 0x%4.4x \t%s\t%#8.8" PRIx32,
+ address, opcode, mnemonic, target_address);
+
+ instruction->info.b_bl_bx_blx.reg_operand = -1;
+ instruction->info.b_bl_bx_blx.target_address = target_address;
+
+ return ERROR_OK;
+}
+
+static int evaluate_add_sub_thumb(uint16_t opcode,
+ uint32_t address, struct arm_instruction *instruction)
+{
+ uint8_t Rd = (opcode >> 0) & 0x7;
+ uint8_t Rn = (opcode >> 3) & 0x7;
+ uint8_t Rm_imm = (opcode >> 6) & 0x7;
+ uint32_t opc = opcode & (1 << 9);
+ uint32_t reg_imm = opcode & (1 << 10);
+ char *mnemonic;
+
+ if (opc)
+ {
+ instruction->type = ARM_SUB;
+ mnemonic = "SUBS";
+ }
+ else
+ {
+ /* REVISIT: if reg_imm == 0, display as "MOVS" */
+ instruction->type = ARM_ADD;
+ mnemonic = "ADDS";
+ }
+
+ instruction->info.data_proc.Rd = Rd;
+ instruction->info.data_proc.Rn = Rn;
+ instruction->info.data_proc.S = 1;
+
+ if (reg_imm)
+ {
+ instruction->info.data_proc.variant = 0; /*immediate*/
+ instruction->info.data_proc.shifter_operand.immediate.immediate = Rm_imm;
+ snprintf(instruction->text, 128,
+ "0x%8.8" PRIx32 " 0x%4.4x \t%s\tr%i, r%i, #%d",
+ address, opcode, mnemonic, Rd, Rn, Rm_imm);
+ }
+ else
+ {
+ instruction->info.data_proc.variant = 1; /*immediate shift*/
+ instruction->info.data_proc.shifter_operand.immediate_shift.Rm = Rm_imm;
+ snprintf(instruction->text, 128,
+ "0x%8.8" PRIx32 " 0x%4.4x \t%s\tr%i, r%i, r%i",
+ address, opcode, mnemonic, Rd, Rn, Rm_imm);
+ }
+
+ return ERROR_OK;
+}
+
+static int evaluate_shift_imm_thumb(uint16_t opcode,
+ uint32_t address, struct arm_instruction *instruction)
+{
+ uint8_t Rd = (opcode >> 0) & 0x7;
+ uint8_t Rm = (opcode >> 3) & 0x7;
+ uint8_t imm = (opcode >> 6) & 0x1f;
+ uint8_t opc = (opcode >> 11) & 0x3;
+ char *mnemonic = NULL;
+
+ switch (opc)
+ {
+ case 0:
+ instruction->type = ARM_MOV;
+ mnemonic = "LSLS";
+ instruction->info.data_proc.shifter_operand.immediate_shift.shift = 0;
+ break;
+ case 1:
+ instruction->type = ARM_MOV;
+ mnemonic = "LSRS";
+ instruction->info.data_proc.shifter_operand.immediate_shift.shift = 1;
+ break;
+ case 2:
+ instruction->type = ARM_MOV;
+ mnemonic = "ASRS";
+ instruction->info.data_proc.shifter_operand.immediate_shift.shift = 2;
+ break;
+ }
+
+ if ((imm == 0) && (opc != 0))
+ imm = 32;
+
+ instruction->info.data_proc.Rd = Rd;
+ instruction->info.data_proc.Rn = -1;
+ instruction->info.data_proc.S = 1;
+
+ instruction->info.data_proc.variant = 1; /*immediate_shift*/
+ instruction->info.data_proc.shifter_operand.immediate_shift.Rm = Rm;
+ instruction->info.data_proc.shifter_operand.immediate_shift.shift_imm = imm;
+
+ snprintf(instruction->text, 128,
+ "0x%8.8" PRIx32 " 0x%4.4x \t%s\tr%i, r%i, #%#2.2x" ,
+ address, opcode, mnemonic, Rd, Rm, imm);
+
+ return ERROR_OK;
+}
+
+static int evaluate_data_proc_imm_thumb(uint16_t opcode,
+ uint32_t address, struct arm_instruction *instruction)
+{
+ uint8_t imm = opcode & 0xff;
+ uint8_t Rd = (opcode >> 8) & 0x7;
+ uint32_t opc = (opcode >> 11) & 0x3;
+ char *mnemonic = NULL;
+
+ instruction->info.data_proc.Rd = Rd;
+ instruction->info.data_proc.Rn = Rd;
+ instruction->info.data_proc.S = 1;
+ instruction->info.data_proc.variant = 0; /*immediate*/
+ instruction->info.data_proc.shifter_operand.immediate.immediate = imm;
+
+ switch (opc)
+ {
+ case 0:
+ instruction->type = ARM_MOV;
+ mnemonic = "MOVS";
+ instruction->info.data_proc.Rn = -1;
+ break;
+ case 1:
+ instruction->type = ARM_CMP;
+ mnemonic = "CMP";
+ instruction->info.data_proc.Rd = -1;
+ break;
+ case 2:
+ instruction->type = ARM_ADD;
+ mnemonic = "ADDS";
+ break;
+ case 3:
+ instruction->type = ARM_SUB;
+ mnemonic = "SUBS";
+ break;
+ }
+
+ snprintf(instruction->text, 128,
+ "0x%8.8" PRIx32 " 0x%4.4x \t%s\tr%i, #%#2.2x",
+ address, opcode, mnemonic, Rd, imm);
+
+ return ERROR_OK;
+}
+
+static int evaluate_data_proc_thumb(uint16_t opcode,
+ uint32_t address, struct arm_instruction *instruction)
+{
+ uint8_t high_reg, op, Rm, Rd,H1,H2;
+ char *mnemonic = NULL;
+ bool nop = false;
+
+ high_reg = (opcode & 0x0400) >> 10;
+ op = (opcode & 0x03C0) >> 6;
+
+ Rd = (opcode & 0x0007);
+ Rm = (opcode & 0x0038) >> 3;
+ H1 = (opcode & 0x0080) >> 7;
+ H2 = (opcode & 0x0040) >> 6;
+
+ instruction->info.data_proc.Rd = Rd;
+ instruction->info.data_proc.Rn = Rd;
+ instruction->info.data_proc.S = (!high_reg || (instruction->type == ARM_CMP));
+ instruction->info.data_proc.variant = 1 /*immediate shift*/;
+ instruction->info.data_proc.shifter_operand.immediate_shift.Rm = Rm;
+
+ if (high_reg)
+ {
+ Rd |= H1 << 3;
+ Rm |= H2 << 3;
+ op >>= 2;
+
+ switch (op)
+ {
+ case 0x0:
+ instruction->type = ARM_ADD;
+ mnemonic = "ADD";
+ break;
+ case 0x1:
+ instruction->type = ARM_CMP;
+ mnemonic = "CMP";
+ break;
+ case 0x2:
+ instruction->type = ARM_MOV;
+ mnemonic = "MOV";
+ if (Rd == Rm)
+ nop = true;
+ break;
+ case 0x3:
+ if ((opcode & 0x7) == 0x0)
+ {
+ instruction->info.b_bl_bx_blx.reg_operand = Rm;
+ if (H1)
+ {
+ instruction->type = ARM_BLX;
+ snprintf(instruction->text, 128,
+ "0x%8.8" PRIx32
+ " 0x%4.4x \tBLX\tr%i",
+ address, opcode, Rm);
+ }
+ else
+ {
+ instruction->type = ARM_BX;
+ snprintf(instruction->text, 128,
+ "0x%8.8" PRIx32
+ " 0x%4.4x \tBX\tr%i",
+ address, opcode, Rm);
+ }
+ }
+ else
+ {
+ instruction->type = ARM_UNDEFINED_INSTRUCTION;
+ snprintf(instruction->text, 128,
+ "0x%8.8" PRIx32
+ " 0x%4.4x \t"
+ "UNDEFINED INSTRUCTION",
+ address, opcode);
+ }
+ return ERROR_OK;
+ break;
+ }
+ }
+ else
+ {
+ switch (op)
+ {
+ case 0x0:
+ instruction->type = ARM_AND;
+ mnemonic = "ANDS";
+ break;
+ case 0x1:
+ instruction->type = ARM_EOR;
+ mnemonic = "EORS";
+ break;
+ case 0x2:
+ instruction->type = ARM_MOV;
+ mnemonic = "LSLS";
+ instruction->info.data_proc.variant = 2 /*register shift*/;
+ instruction->info.data_proc.shifter_operand.register_shift.shift = 0;
+ instruction->info.data_proc.shifter_operand.register_shift.Rm = Rd;
+ instruction->info.data_proc.shifter_operand.register_shift.Rs = Rm;
+ break;
+ case 0x3:
+ instruction->type = ARM_MOV;
+ mnemonic = "LSRS";
+ instruction->info.data_proc.variant = 2 /*register shift*/;
+ instruction->info.data_proc.shifter_operand.register_shift.shift = 1;
+ instruction->info.data_proc.shifter_operand.register_shift.Rm = Rd;
+ instruction->info.data_proc.shifter_operand.register_shift.Rs = Rm;
+ break;
+ case 0x4:
+ instruction->type = ARM_MOV;
+ mnemonic = "ASRS";
+ instruction->info.data_proc.variant = 2 /*register shift*/;
+ instruction->info.data_proc.shifter_operand.register_shift.shift = 2;
+ instruction->info.data_proc.shifter_operand.register_shift.Rm = Rd;
+ instruction->info.data_proc.shifter_operand.register_shift.Rs = Rm;
+ break;
+ case 0x5:
+ instruction->type = ARM_ADC;
+ mnemonic = "ADCS";
+ break;
+ case 0x6:
+ instruction->type = ARM_SBC;
+ mnemonic = "SBCS";
+ break;
+ case 0x7:
+ instruction->type = ARM_MOV;
+ mnemonic = "RORS";
+ instruction->info.data_proc.variant = 2 /*register shift*/;
+ instruction->info.data_proc.shifter_operand.register_shift.shift = 3;
+ instruction->info.data_proc.shifter_operand.register_shift.Rm = Rd;
+ instruction->info.data_proc.shifter_operand.register_shift.Rs = Rm;
+ break;
+ case 0x8:
+ instruction->type = ARM_TST;
+ mnemonic = "TST";
+ break;
+ case 0x9:
+ instruction->type = ARM_RSB;
+ mnemonic = "RSBS";
+ instruction->info.data_proc.variant = 0 /*immediate*/;
+ instruction->info.data_proc.shifter_operand.immediate.immediate = 0;
+ instruction->info.data_proc.Rn = Rm;
+ break;
+ case 0xA:
+ instruction->type = ARM_CMP;
+ mnemonic = "CMP";
+ break;
+ case 0xB:
+ instruction->type = ARM_CMN;
+ mnemonic = "CMN";
+ break;
+ case 0xC:
+ instruction->type = ARM_ORR;
+ mnemonic = "ORRS";
+ break;
+ case 0xD:
+ instruction->type = ARM_MUL;
+ mnemonic = "MULS";
+ break;
+ case 0xE:
+ instruction->type = ARM_BIC;
+ mnemonic = "BICS";
+ break;
+ case 0xF:
+ instruction->type = ARM_MVN;
+ mnemonic = "MVNS";
+ break;
+ }
+ }
+
+ if (nop)
+ snprintf(instruction->text, 128,
+ "0x%8.8" PRIx32 " 0x%4.4x \tNOP\t\t\t"
+ "; (%s r%i, r%i)",
+ address, opcode, mnemonic, Rd, Rm);
+ else
+ snprintf(instruction->text, 128,
+ "0x%8.8" PRIx32 " 0x%4.4x \t%s\tr%i, r%i",
+ address, opcode, mnemonic, Rd, Rm);
+
+ return ERROR_OK;
+}
+
+/* PC-relative data addressing is word-aligned even with Thumb */
+static inline uint32_t thumb_alignpc4(uint32_t addr)
+{
+ return (addr + 4) & ~3;
+}
+
+static int evaluate_load_literal_thumb(uint16_t opcode,
+ uint32_t address, struct arm_instruction *instruction)
+{
+ uint32_t immediate;
+ uint8_t Rd = (opcode >> 8) & 0x7;
+
+ instruction->type = ARM_LDR;
+ immediate = opcode & 0x000000ff;
+ immediate *= 4;
+
+ instruction->info.load_store.Rd = Rd;
+ instruction->info.load_store.Rn = 15 /*PC*/;
+ instruction->info.load_store.index_mode = 0; /*offset*/
+ instruction->info.load_store.offset_mode = 0; /*immediate*/
+ instruction->info.load_store.offset.offset = immediate;
+
+ snprintf(instruction->text, 128,
+ "0x%8.8" PRIx32 " 0x%4.4x \t"
+ "LDR\tr%i, [pc, #%#" PRIx32 "]\t; %#8.8" PRIx32,
+ address, opcode, Rd, immediate,
+ thumb_alignpc4(address) + immediate);
+
+ return ERROR_OK;
+}
+
+static int evaluate_load_store_reg_thumb(uint16_t opcode,
+ uint32_t address, struct arm_instruction *instruction)
+{
+ uint8_t Rd = (opcode >> 0) & 0x7;
+ uint8_t Rn = (opcode >> 3) & 0x7;
+ uint8_t Rm = (opcode >> 6) & 0x7;
+ uint8_t opc = (opcode >> 9) & 0x7;
+ char *mnemonic = NULL;
+
+ switch (opc)
+ {
+ case 0:
+ instruction->type = ARM_STR;
+ mnemonic = "STR";
+ break;
+ case 1:
+ instruction->type = ARM_STRH;
+ mnemonic = "STRH";
+ break;
+ case 2:
+ instruction->type = ARM_STRB;
+ mnemonic = "STRB";
+ break;
+ case 3:
+ instruction->type = ARM_LDRSB;
+ mnemonic = "LDRSB";
+ break;
+ case 4:
+ instruction->type = ARM_LDR;
+ mnemonic = "LDR";
+ break;
+ case 5:
+ instruction->type = ARM_LDRH;
+ mnemonic = "LDRH";
+ break;
+ case 6:
+ instruction->type = ARM_LDRB;
+ mnemonic = "LDRB";
+ break;
+ case 7:
+ instruction->type = ARM_LDRSH;
+ mnemonic = "LDRSH";
+ break;
+ }
+
+ snprintf(instruction->text, 128,
+ "0x%8.8" PRIx32 " 0x%4.4x \t%s\tr%i, [r%i, r%i]",
+ address, opcode, mnemonic, Rd, Rn, Rm);
+
+ instruction->info.load_store.Rd = Rd;
+ instruction->info.load_store.Rn = Rn;
+ instruction->info.load_store.index_mode = 0; /*offset*/
+ instruction->info.load_store.offset_mode = 1; /*register*/
+ instruction->info.load_store.offset.reg.Rm = Rm;
+
+ return ERROR_OK;
+}
+
+static int evaluate_load_store_imm_thumb(uint16_t opcode,
+ uint32_t address, struct arm_instruction *instruction)
+{
+ uint32_t offset = (opcode >> 6) & 0x1f;
+ uint8_t Rd = (opcode >> 0) & 0x7;
+ uint8_t Rn = (opcode >> 3) & 0x7;
+ uint32_t L = opcode & (1 << 11);
+ uint32_t B = opcode & (1 << 12);
+ char *mnemonic;
+ char suffix = ' ';
+ uint32_t shift = 2;
+
+ if (L)
+ {
+ instruction->type = ARM_LDR;
+ mnemonic = "LDR";
+ }
+ else
+ {
+ instruction->type = ARM_STR;
+ mnemonic = "STR";
+ }
+
+ if ((opcode&0xF000) == 0x8000)
+ {
+ suffix = 'H';
+ shift = 1;
+ }
+ else if (B)
+ {
+ suffix = 'B';
+ shift = 0;
+ }
+
+ snprintf(instruction->text, 128,
+ "0x%8.8" PRIx32 " 0x%4.4x \t%s%c\tr%i, [r%i, #%#" PRIx32 "]",
+ address, opcode, mnemonic, suffix, Rd, Rn, offset << shift);
+
+ instruction->info.load_store.Rd = Rd;
+ instruction->info.load_store.Rn = Rn;
+ instruction->info.load_store.index_mode = 0; /*offset*/
+ instruction->info.load_store.offset_mode = 0; /*immediate*/
+ instruction->info.load_store.offset.offset = offset << shift;
+
+ return ERROR_OK;
+}
+
+static int evaluate_load_store_stack_thumb(uint16_t opcode,
+ uint32_t address, struct arm_instruction *instruction)
+{
+ uint32_t offset = opcode & 0xff;
+ uint8_t Rd = (opcode >> 8) & 0x7;
+ uint32_t L = opcode & (1 << 11);
+ char *mnemonic;
+
+ if (L)
+ {
+ instruction->type = ARM_LDR;
+ mnemonic = "LDR";
+ }
+ else
+ {
+ instruction->type = ARM_STR;
+ mnemonic = "STR";
+ }
+
+ snprintf(instruction->text, 128,
+ "0x%8.8" PRIx32 " 0x%4.4x \t%s\tr%i, [SP, #%#" PRIx32 "]",
+ address, opcode, mnemonic, Rd, offset*4);
+
+ instruction->info.load_store.Rd = Rd;
+ instruction->info.load_store.Rn = 13 /*SP*/;
+ instruction->info.load_store.index_mode = 0; /*offset*/
+ instruction->info.load_store.offset_mode = 0; /*immediate*/
+ instruction->info.load_store.offset.offset = offset*4;
+
+ return ERROR_OK;
+}
+
+static int evaluate_add_sp_pc_thumb(uint16_t opcode,
+ uint32_t address, struct arm_instruction *instruction)
+{
+ uint32_t imm = opcode & 0xff;
+ uint8_t Rd = (opcode >> 8) & 0x7;
+ uint8_t Rn;
+ uint32_t SP = opcode & (1 << 11);
+ const char *reg_name;
+
+ instruction->type = ARM_ADD;
+
+ if (SP)
+ {
+ reg_name = "SP";
+ Rn = 13;
+ }
+ else
+ {
+ reg_name = "PC";
+ Rn = 15;
+ }
+
+ snprintf(instruction->text, 128,
+ "0x%8.8" PRIx32 " 0x%4.4x \tADD\tr%i, %s, #%#" PRIx32,
+ address, opcode, Rd, reg_name, imm * 4);
+
+ instruction->info.data_proc.variant = 0 /* immediate */;
+ instruction->info.data_proc.Rd = Rd;
+ instruction->info.data_proc.Rn = Rn;
+ instruction->info.data_proc.shifter_operand.immediate.immediate = imm*4;
+
+ return ERROR_OK;
+}
+
+static int evaluate_adjust_stack_thumb(uint16_t opcode,
+ uint32_t address, struct arm_instruction *instruction)
+{
+ uint32_t imm = opcode & 0x7f;
+ uint8_t opc = opcode & (1 << 7);
+ char *mnemonic;
+
+
+ if (opc)
+ {
+ instruction->type = ARM_SUB;
+ mnemonic = "SUB";
+ }
+ else
+ {
+ instruction->type = ARM_ADD;
+ mnemonic = "ADD";
+ }
+
+ snprintf(instruction->text, 128,
+ "0x%8.8" PRIx32 " 0x%4.4x \t%s\tSP, #%#" PRIx32,
+ address, opcode, mnemonic, imm*4);
+
+ instruction->info.data_proc.variant = 0 /* immediate */;
+ instruction->info.data_proc.Rd = 13 /*SP*/;
+ instruction->info.data_proc.Rn = 13 /*SP*/;
+ instruction->info.data_proc.shifter_operand.immediate.immediate = imm*4;
+
+ return ERROR_OK;
+}
+
+static int evaluate_breakpoint_thumb(uint16_t opcode,
+ uint32_t address, struct arm_instruction *instruction)
+{
+ uint32_t imm = opcode & 0xff;
+
+ instruction->type = ARM_BKPT;
+
+ snprintf(instruction->text, 128,
+ "0x%8.8" PRIx32 " 0x%4.4x \tBKPT\t%#2.2" PRIx32 "",
+ address, opcode, imm);
+
+ return ERROR_OK;
+}
+
+static int evaluate_load_store_multiple_thumb(uint16_t opcode,
+ uint32_t address, struct arm_instruction *instruction)
+{
+ uint32_t reg_list = opcode & 0xff;
+ uint32_t L = opcode & (1 << 11);
+ uint32_t R = opcode & (1 << 8);
+ uint8_t Rn = (opcode >> 8) & 7;
+ uint8_t addr_mode = 0 /* IA */;
+ char reg_names[40];
+ char *reg_names_p;
+ char *mnemonic;
+ char ptr_name[7] = "";
+ int i;
+
+ /* REVISIT: in ThumbEE mode, there are no LDM or STM instructions.
+ * The STMIA and LDMIA opcodes are used for other instructions.
+ */
+
+ if ((opcode & 0xf000) == 0xc000)
+ { /* generic load/store multiple */
+ char *wback = "!";
+
+ if (L)
+ {
+ instruction->type = ARM_LDM;
+ mnemonic = "LDM";
+ if (opcode & (1 << Rn))
+ wback = "";
+ }
+ else
+ {
+ instruction->type = ARM_STM;
+ mnemonic = "STM";
+ }
+ snprintf(ptr_name, sizeof ptr_name, "r%i%s, ", Rn, wback);
+ }
+ else
+ { /* push/pop */
+ Rn = 13; /* SP */
+ if (L)
+ {
+ instruction->type = ARM_LDM;
+ mnemonic = "POP";
+ if (R)
+ reg_list |= (1 << 15) /*PC*/;
+ }
+ else
+ {
+ instruction->type = ARM_STM;
+ mnemonic = "PUSH";
+ addr_mode = 3; /*DB*/
+ if (R)
+ reg_list |= (1 << 14) /*LR*/;
+ }
+ }
+
+ reg_names_p = reg_names;
+ for (i = 0; i <= 15; i++)
+ {
+ if (reg_list & (1 << i))
+ reg_names_p += snprintf(reg_names_p, (reg_names + 40 - reg_names_p), "r%i, ", i);
+ }
+ if (reg_names_p > reg_names)
+ reg_names_p[-2] = '\0';
+ else /* invalid op : no registers */
+ reg_names[0] = '\0';
+
+ snprintf(instruction->text, 128,
+ "0x%8.8" PRIx32 " 0x%4.4x \t%s\t%s{%s}",
+ address, opcode, mnemonic, ptr_name, reg_names);
+
+ instruction->info.load_store_multiple.register_list = reg_list;
+ instruction->info.load_store_multiple.Rn = Rn;
+ instruction->info.load_store_multiple.addressing_mode = addr_mode;
+
+ return ERROR_OK;
+}
+
+static int evaluate_cond_branch_thumb(uint16_t opcode,
+ uint32_t address, struct arm_instruction *instruction)
+{
+ uint32_t offset = opcode & 0xff;
+ uint8_t cond = (opcode >> 8) & 0xf;
+ uint32_t target_address;
+
+ if (cond == 0xf)
+ {
+ instruction->type = ARM_SWI;
+ snprintf(instruction->text, 128,
+ "0x%8.8" PRIx32 " 0x%4.4x \tSVC\t%#2.2" PRIx32,
+ address, opcode, offset);
+ return ERROR_OK;
+ }
+ else if (cond == 0xe)
+ {
+ instruction->type = ARM_UNDEFINED_INSTRUCTION;
+ snprintf(instruction->text, 128,
+ "0x%8.8" PRIx32 " 0x%4.4x \tUNDEFINED INSTRUCTION",
+ address, opcode);
+ return ERROR_OK;
+ }
+
+ /* sign extend 8-bit offset */
+ if (offset & 0x00000080)
+ offset = 0xffffff00 | offset;
+
+ target_address = address + 4 + (offset << 1);
+
+ snprintf(instruction->text, 128,
+ "0x%8.8" PRIx32 " 0x%4.4x \tB%s\t%#8.8" PRIx32,
+ address, opcode,
+ arm_condition_strings[cond], target_address);
+
+ instruction->type = ARM_B;
+ instruction->info.b_bl_bx_blx.reg_operand = -1;
+ instruction->info.b_bl_bx_blx.target_address = target_address;
+
+ return ERROR_OK;
+}
+
+static int evaluate_cb_thumb(uint16_t opcode, uint32_t address,
+ struct arm_instruction *instruction)
+{
+ unsigned offset;
+
+ /* added in Thumb2 */
+ offset = (opcode >> 3) & 0x1f;
+ offset |= (opcode & 0x0200) >> 4;
+
+ snprintf(instruction->text, 128,
+ "0x%8.8" PRIx32 " 0x%4.4x \tCB%sZ\tr%d, %#8.8" PRIx32,
+ address, opcode,
+ (opcode & 0x0800) ? "N" : "",
+ opcode & 0x7, address + 4 + (offset << 1));
+
+ return ERROR_OK;
+}
+
+static int evaluate_extend_thumb(uint16_t opcode, uint32_t address,
+ struct arm_instruction *instruction)
+{
+ /* added in ARMv6 */
+ snprintf(instruction->text, 128,
+ "0x%8.8" PRIx32 " 0x%4.4x \t%cXT%c\tr%d, r%d",
+ address, opcode,
+ (opcode & 0x0080) ? 'U' : 'S',
+ (opcode & 0x0040) ? 'B' : 'H',
+ opcode & 0x7, (opcode >> 3) & 0x7);
+
+ return ERROR_OK;
+}
+
+static int evaluate_cps_thumb(uint16_t opcode, uint32_t address,
+ struct arm_instruction *instruction)
+{
+ /* added in ARMv6 */
+ if ((opcode & 0x0ff0) == 0x0650)
+ snprintf(instruction->text, 128,
+ "0x%8.8" PRIx32 " 0x%4.4x \tSETEND %s",
+ address, opcode,
+ (opcode & 0x80) ? "BE" : "LE");
+ else /* ASSUME (opcode & 0x0fe0) == 0x0660 */
+ snprintf(instruction->text, 128,
+ "0x%8.8" PRIx32 " 0x%4.4x \tCPSI%c\t%s%s%s",
+ address, opcode,
+ (opcode & 0x0010) ? 'D' : 'E',
+ (opcode & 0x0004) ? "A" : "",
+ (opcode & 0x0002) ? "I" : "",
+ (opcode & 0x0001) ? "F" : "");
+
+ return ERROR_OK;
+}
+
+static int evaluate_byterev_thumb(uint16_t opcode, uint32_t address,
+ struct arm_instruction *instruction)
+{
+ char *suffix;
+
+ /* added in ARMv6 */
+ switch ((opcode >> 6) & 3) {
+ case 0:
+ suffix = "";
+ break;
+ case 1:
+ suffix = "16";
+ break;
+ default:
+ suffix = "SH";
+ break;
+ }
+ snprintf(instruction->text, 128,
+ "0x%8.8" PRIx32 " 0x%4.4x \tREV%s\tr%d, r%d",
+ address, opcode, suffix,
+ opcode & 0x7, (opcode >> 3) & 0x7);
+
+ return ERROR_OK;
+}
+
+static int evaluate_hint_thumb(uint16_t opcode, uint32_t address,
+ struct arm_instruction *instruction)
+{
+ char *hint;
+
+ switch ((opcode >> 4) & 0x0f) {
+ case 0:
+ hint = "NOP";
+ break;
+ case 1:
+ hint = "YIELD";
+ break;
+ case 2:
+ hint = "WFE";
+ break;
+ case 3:
+ hint = "WFI";
+ break;
+ case 4:
+ hint = "SEV";
+ break;
+ default:
+ hint = "HINT (UNRECOGNIZED)";
+ break;
+ }
+
+ snprintf(instruction->text, 128,
+ "0x%8.8" PRIx32 " 0x%4.4x \t%s",
+ address, opcode, hint);
+
+ return ERROR_OK;
+}
+
+static int evaluate_ifthen_thumb(uint16_t opcode, uint32_t address,
+ struct arm_instruction *instruction)
+{
+ unsigned cond = (opcode >> 4) & 0x0f;
+ char *x = "", *y = "", *z = "";
+
+ if (opcode & 0x01)
+ z = (opcode & 0x02) ? "T" : "E";
+ if (opcode & 0x03)
+ y = (opcode & 0x04) ? "T" : "E";
+ if (opcode & 0x07)
+ x = (opcode & 0x08) ? "T" : "E";
+
+ snprintf(instruction->text, 128,
+ "0x%8.8" PRIx32 " 0x%4.4x \tIT%s%s%s\t%s",
+ address, opcode,
+ x, y, z, arm_condition_strings[cond]);
+
+ /* NOTE: strictly speaking, the next 1-4 instructions should
+ * now be displayed with the relevant conditional suffix...
+ */
+
+ return ERROR_OK;
+}
+
+int thumb_evaluate_opcode(uint16_t opcode, uint32_t address, struct arm_instruction *instruction)
+{
+ /* clear fields, to avoid confusion */
+ memset(instruction, 0, sizeof(struct arm_instruction));
+ instruction->opcode = opcode;
+ instruction->instruction_size = 2;
+
+ if ((opcode & 0xe000) == 0x0000)
+ {
+ /* add/substract register or immediate */
+ if ((opcode & 0x1800) == 0x1800)
+ return evaluate_add_sub_thumb(opcode, address, instruction);
+ /* shift by immediate */
+ else
+ return evaluate_shift_imm_thumb(opcode, address, instruction);
+ }
+
+ /* Add/substract/compare/move immediate */
+ if ((opcode & 0xe000) == 0x2000)
+ {
+ return evaluate_data_proc_imm_thumb(opcode, address, instruction);
+ }
+
+ /* Data processing instructions */
+ if ((opcode & 0xf800) == 0x4000)
+ {
+ return evaluate_data_proc_thumb(opcode, address, instruction);
+ }
+
+ /* Load from literal pool */
+ if ((opcode & 0xf800) == 0x4800)
+ {
+ return evaluate_load_literal_thumb(opcode, address, instruction);
+ }
+
+ /* Load/Store register offset */
+ if ((opcode & 0xf000) == 0x5000)
+ {
+ return evaluate_load_store_reg_thumb(opcode, address, instruction);
+ }
+
+ /* Load/Store immediate offset */
+ if (((opcode & 0xe000) == 0x6000)
+ ||((opcode & 0xf000) == 0x8000))
+ {
+ return evaluate_load_store_imm_thumb(opcode, address, instruction);
+ }
+
+ /* Load/Store from/to stack */
+ if ((opcode & 0xf000) == 0x9000)
+ {
+ return evaluate_load_store_stack_thumb(opcode, address, instruction);
+ }
+
+ /* Add to SP/PC */
+ if ((opcode & 0xf000) == 0xa000)
+ {
+ return evaluate_add_sp_pc_thumb(opcode, address, instruction);
+ }
+
+ /* Misc */
+ if ((opcode & 0xf000) == 0xb000)
+ {
+ switch ((opcode >> 8) & 0x0f) {
+ case 0x0:
+ return evaluate_adjust_stack_thumb(opcode, address, instruction);
+ case 0x1:
+ case 0x3:
+ case 0x9:
+ case 0xb:
+ return evaluate_cb_thumb(opcode, address, instruction);
+ case 0x2:
+ return evaluate_extend_thumb(opcode, address, instruction);
+ case 0x4:
+ case 0x5:
+ case 0xc:
+ case 0xd:
+ return evaluate_load_store_multiple_thumb(opcode, address,
+ instruction);
+ case 0x6:
+ return evaluate_cps_thumb(opcode, address, instruction);
+ case 0xa:
+ if ((opcode & 0x00c0) == 0x0080)
+ break;
+ return evaluate_byterev_thumb(opcode, address, instruction);
+ case 0xe:
+ return evaluate_breakpoint_thumb(opcode, address, instruction);
+ case 0xf:
+ if (opcode & 0x000f)
+ return evaluate_ifthen_thumb(opcode, address,
+ instruction);
+ else
+ return evaluate_hint_thumb(opcode, address,
+ instruction);
+ }
+
+ instruction->type = ARM_UNDEFINED_INSTRUCTION;
+ snprintf(instruction->text, 128,
+ "0x%8.8" PRIx32 " 0x%4.4x \tUNDEFINED INSTRUCTION",
+ address, opcode);
+ return ERROR_OK;
+ }
+
+ /* Load/Store multiple */
+ if ((opcode & 0xf000) == 0xc000)
+ {
+ return evaluate_load_store_multiple_thumb(opcode, address, instruction);
+ }
+
+ /* Conditional branch + SWI */
+ if ((opcode & 0xf000) == 0xd000)
+ {
+ return evaluate_cond_branch_thumb(opcode, address, instruction);
+ }
+
+ if ((opcode & 0xe000) == 0xe000)
+ {
+ /* Undefined instructions */
+ if ((opcode & 0xf801) == 0xe801)
+ {
+ instruction->type = ARM_UNDEFINED_INSTRUCTION;
+ snprintf(instruction->text, 128,
+ "0x%8.8" PRIx32 " 0x%8.8x\t"
+ "UNDEFINED INSTRUCTION",
+ address, opcode);
+ return ERROR_OK;
+ }
+ else
+ { /* Branch to offset */
+ return evaluate_b_bl_blx_thumb(opcode, address, instruction);
+ }
+ }
+
+ LOG_ERROR("Thumb: should never reach this point (opcode=%04x)", opcode);
+ return -1;
+}
+
+static int t2ev_b_bl(uint32_t opcode, uint32_t address,
+ struct arm_instruction *instruction, char *cp)
+{
+ unsigned offset;
+ unsigned b21 = 1 << 21;
+ unsigned b22 = 1 << 22;
+
+ /* instead of combining two smaller 16-bit branch instructions,
+ * Thumb2 uses only one larger 32-bit instruction.
+ */
+ offset = opcode & 0x7ff;
+ offset |= (opcode & 0x03ff0000) >> 5;
+ if (opcode & (1 << 26)) {
+ offset |= 0xff << 23;
+ if ((opcode & (1 << 11)) == 0)
+ b21 = 0;
+ if ((opcode & (1 << 13)) == 0)
+ b22 = 0;
+ } else {
+ if (opcode & (1 << 11))
+ b21 = 0;
+ if (opcode & (1 << 13))
+ b22 = 0;
+ }
+ offset |= b21;
+ offset |= b22;
+
+
+ address += 4;
+ address += offset << 1;
+
+ instruction->type = (opcode & (1 << 14)) ? ARM_BL : ARM_B;
+ instruction->info.b_bl_bx_blx.reg_operand = -1;
+ instruction->info.b_bl_bx_blx.target_address = address;
+ sprintf(cp, "%s\t%#8.8" PRIx32,
+ (opcode & (1 << 14)) ? "BL" : "B.W",
+ address);
+
+ return ERROR_OK;
+}
+
+static int t2ev_cond_b(uint32_t opcode, uint32_t address,
+ struct arm_instruction *instruction, char *cp)
+{
+ unsigned offset;
+ unsigned b17 = 1 << 17;
+ unsigned b18 = 1 << 18;
+ unsigned cond = (opcode >> 22) & 0x0f;
+
+ offset = opcode & 0x7ff;
+ offset |= (opcode & 0x003f0000) >> 5;
+ if (opcode & (1 << 26)) {
+ offset |= 0xffff << 19;
+ if ((opcode & (1 << 11)) == 0)
+ b17 = 0;
+ if ((opcode & (1 << 13)) == 0)
+ b18 = 0;
+ } else {
+ if (opcode & (1 << 11))
+ b17 = 0;
+ if (opcode & (1 << 13))
+ b18 = 0;
+ }
+ offset |= b17;
+ offset |= b18;
+
+ address += 4;
+ address += offset << 1;
+
+ instruction->type = ARM_B;
+ instruction->info.b_bl_bx_blx.reg_operand = -1;
+ instruction->info.b_bl_bx_blx.target_address = address;
+ sprintf(cp, "B%s.W\t%#8.8" PRIx32,
+ arm_condition_strings[cond],
+ address);
+
+ return ERROR_OK;
+}
+
+static const char *special_name(int number)
+{
+ char *special = "(RESERVED)";
+
+ switch (number) {
+ case 0:
+ special = "apsr";
+ break;
+ case 1:
+ special = "iapsr";
+ break;
+ case 2:
+ special = "eapsr";
+ break;
+ case 3:
+ special = "xpsr";
+ break;
+ case 5:
+ special = "ipsr";
+ break;
+ case 6:
+ special = "epsr";
+ break;
+ case 7:
+ special = "iepsr";
+ break;
+ case 8:
+ special = "msp";
+ break;
+ case 9:
+ special = "psp";
+ break;
+ case 16:
+ special = "primask";
+ break;
+ case 17:
+ special = "basepri";
+ break;
+ case 18:
+ special = "basepri_max";
+ break;
+ case 19:
+ special = "faultmask";
+ break;
+ case 20:
+ special = "control";
+ break;
+ }
+ return special;
+}
+
+static int t2ev_hint(uint32_t opcode, uint32_t address,
+ struct arm_instruction *instruction, char *cp)
+{
+ const char *mnemonic;
+
+ if (opcode & 0x0700) {
+ instruction->type = ARM_UNDEFINED_INSTRUCTION;
+ strcpy(cp, "UNDEFINED");
+ return ERROR_OK;
+ }
+
+ if (opcode & 0x00f0) {
+ sprintf(cp, "DBG\t#%d", (int) opcode & 0xf);
+ return ERROR_OK;
+ }
+
+ switch (opcode & 0x0f) {
+ case 0:
+ mnemonic = "NOP.W";
+ break;
+ case 1:
+ mnemonic = "YIELD.W";
+ break;
+ case 2:
+ mnemonic = "WFE.W";
+ break;
+ case 3:
+ mnemonic = "WFI.W";
+ break;
+ case 4:
+ mnemonic = "SEV.W";
+ break;
+ default:
+ mnemonic = "HINT.W (UNRECOGNIZED)";
+ break;
+ }
+ strcpy(cp, mnemonic);
+ return ERROR_OK;
+}
+
+static int t2ev_misc(uint32_t opcode, uint32_t address,
+ struct arm_instruction *instruction, char *cp)
+{
+ const char *mnemonic;
+
+ switch ((opcode >> 4) & 0x0f) {
+ case 0:
+ mnemonic = "LEAVEX";
+ break;
+ case 1:
+ mnemonic = "ENTERX";
+ break;
+ case 2:
+ mnemonic = "CLREX";
+ break;
+ case 4:
+ mnemonic = "DSB";
+ break;
+ case 5:
+ mnemonic = "DMB";
+ break;
+ case 6:
+ mnemonic = "ISB";
+ break;
+ default:
+ return ERROR_INVALID_ARGUMENTS;
+ }
+ strcpy(cp, mnemonic);
+ return ERROR_OK;
+}
+
+static int t2ev_b_misc(uint32_t opcode, uint32_t address,
+ struct arm_instruction *instruction, char *cp)
+{
+ /* permanently undefined */
+ if ((opcode & 0x07f07000) == 0x07f02000) {
+ instruction->type = ARM_UNDEFINED_INSTRUCTION;
+ strcpy(cp, "UNDEFINED");
+ return ERROR_OK;
+ }
+
+ switch ((opcode >> 12) & 0x5) {
+ case 0x1:
+ case 0x5:
+ return t2ev_b_bl(opcode, address, instruction, cp);
+ case 0x4:
+ goto undef;
+ case 0:
+ if (((opcode >> 23) & 0x07) != 0x07)
+ return t2ev_cond_b(opcode, address, instruction, cp);
+ if (opcode & (1 << 26))
+ goto undef;
+ break;
+ }
+
+ switch ((opcode >> 20) & 0x7f) {
+ case 0x38:
+ case 0x39:
+ sprintf(cp, "MSR\t%s, r%d", special_name(opcode & 0xff),
+ (int) (opcode >> 16) & 0x0f);
+ return ERROR_OK;
+ case 0x3a:
+ return t2ev_hint(opcode, address, instruction, cp);
+ case 0x3b:
+ return t2ev_misc(opcode, address, instruction, cp);
+ case 0x3c:
+ sprintf(cp, "BXJ\tr%d", (int) (opcode >> 16) & 0x0f);
+ return ERROR_OK;
+ case 0x3e:
+ case 0x3f:
+ sprintf(cp, "MRS\tr%d, %s", (int) (opcode >> 8) & 0x0f,
+ special_name(opcode & 0xff));
+ return ERROR_OK;
+ }
+
+undef:
+ return ERROR_INVALID_ARGUMENTS;
+}
+
+static int t2ev_data_mod_immed(uint32_t opcode, uint32_t address,
+ struct arm_instruction *instruction, char *cp)
+{
+ char *mnemonic = NULL;
+ int rn = (opcode >> 16) & 0xf;
+ int rd = (opcode >> 8) & 0xf;
+ unsigned immed = opcode & 0xff;
+ unsigned func;
+ bool one = false;
+ char *suffix = "";
+ char *suffix2 = "";
+
+ /* ARMv7-M: A5.3.2 Modified immediate constants */
+ func = (opcode >> 11) & 0x0e;
+ if (immed & 0x80)
+ func |= 1;
+ if (opcode & (1 << 26))
+ func |= 0x10;
+
+ /* "Modified" immediates */
+ switch (func >> 1) {
+ case 0:
+ break;
+ case 2:
+ immed <<= 8;
+ /* FALLTHROUGH */
+ case 1:
+ immed += immed << 16;
+ break;
+ case 3:
+ immed += immed << 8;
+ immed += immed << 16;
+ break;
+ default:
+ immed |= 0x80;
+ immed = ror(immed, func);
+ }
+
+ if (opcode & (1 << 20))
+ suffix = "S";
+
+ switch ((opcode >> 21) & 0xf) {
+ case 0:
+ if (rd == 0xf) {
+ instruction->type = ARM_TST;
+ mnemonic = "TST";
+ one = true;
+ suffix = "";
+ rd = rn;
+ } else {
+ instruction->type = ARM_AND;
+ mnemonic = "AND";
+ }
+ break;
+ case 1:
+ instruction->type = ARM_BIC;
+ mnemonic = "BIC";
+ break;
+ case 2:
+ if (rn == 0xf) {
+ instruction->type = ARM_MOV;
+ mnemonic = "MOV";
+ one = true;
+ suffix2 = ".W";
+ } else {
+ instruction->type = ARM_ORR;
+ mnemonic = "ORR";
+ }
+ break;
+ case 3:
+ if (rn == 0xf) {
+ instruction->type = ARM_MVN;
+ mnemonic = "MVN";
+ one = true;
+ } else {
+ // instruction->type = ARM_ORN;
+ mnemonic = "ORN";
+ }
+ break;
+ case 4:
+ if (rd == 0xf) {
+ instruction->type = ARM_TEQ;
+ mnemonic = "TEQ";
+ one = true;
+ suffix = "";
+ rd = rn;
+ } else {
+ instruction->type = ARM_EOR;
+ mnemonic = "EOR";
+ }
+ break;
+ case 8:
+ if (rd == 0xf) {
+ instruction->type = ARM_CMN;
+ mnemonic = "CMN";
+ one = true;
+ suffix = "";
+ rd = rn;
+ } else {
+ instruction->type = ARM_ADD;
+ mnemonic = "ADD";
+ suffix2 = ".W";
+ }
+ break;
+ case 10:
+ instruction->type = ARM_ADC;
+ mnemonic = "ADC";
+ suffix2 = ".W";
+ break;
+ case 11:
+ instruction->type = ARM_SBC;
+ mnemonic = "SBC";
+ break;
+ case 13:
+ if (rd == 0xf) {
+ instruction->type = ARM_CMP;
+ mnemonic = "CMP";
+ one = true;
+ suffix = "";
+ rd = rn;
+ } else {
+ instruction->type = ARM_SUB;
+ mnemonic = "SUB";
+ }
+ suffix2 = ".W";
+ break;
+ case 14:
+ instruction->type = ARM_RSB;
+ mnemonic = "RSB";
+ suffix2 = ".W";
+ break;
+ default:
+ return ERROR_INVALID_ARGUMENTS;
+ }
+
+ if (one)
+ sprintf(cp, "%s%s\tr%d, #%d\t; %#8.8x",
+ mnemonic, suffix2 ,rd, immed, immed);
+ else
+ sprintf(cp, "%s%s%s\tr%d, r%d, #%d\t; %#8.8x",
+ mnemonic, suffix, suffix2,
+ rd, rn, immed, immed);
+
+ return ERROR_OK;
+}
+
+static int t2ev_data_immed(uint32_t opcode, uint32_t address,
+ struct arm_instruction *instruction, char *cp)
+{
+ char *mnemonic = NULL;
+ int rn = (opcode >> 16) & 0xf;
+ int rd = (opcode >> 8) & 0xf;
+ unsigned immed;
+ bool add = false;
+ bool is_signed = false;
+
+ immed = (opcode & 0x0ff) | ((opcode & 0x7000) >> 4);
+ if (opcode & (1 << 26))
+ immed |= (1 << 11);
+
+ switch ((opcode >> 20) & 0x1f) {
+ case 0:
+ if (rn == 0xf) {
+ add = true;
+ goto do_adr;
+ }
+ mnemonic = "ADDW";
+ break;
+ case 4:
+ immed |= (opcode >> 4) & 0xf000;
+ sprintf(cp, "MOVW\tr%d, #%d\t; %#3.3x", rd, immed, immed);
+ return ERROR_OK;
+ case 0x0a:
+ if (rn == 0xf)
+ goto do_adr;
+ mnemonic = "SUBW";
+ break;
+ case 0x0c:
+ /* move constant to top 16 bits of register */
+ immed |= (opcode >> 4) & 0xf000;
+ sprintf(cp, "MOVT\tr%d, #%d\t; %#4.4x", rd, immed, immed);
+ return ERROR_OK;
+ case 0x10:
+ case 0x12:
+ is_signed = true;
+ case 0x18:
+ case 0x1a:
+ /* signed/unsigned saturated add */
+ immed = (opcode >> 6) & 0x03;
+ immed |= (opcode >> 10) & 0x1c;
+ sprintf(cp, "%sSAT\tr%d, #%d, r%d, %s #%d\t",
+ is_signed ? "S" : "U",
+ rd, (int) (opcode & 0x1f) + is_signed, rn,
+ (opcode & (1 << 21)) ? "ASR" : "LSL",
+ immed ? immed : 32);
+ return ERROR_OK;
+ case 0x14:
+ is_signed = true;
+ /* FALLTHROUGH */
+ case 0x1c:
+ /* signed/unsigned bitfield extract */
+ immed = (opcode >> 6) & 0x03;
+ immed |= (opcode >> 10) & 0x1c;
+ sprintf(cp, "%sBFX\tr%d, r%d, #%d, #%d\t",
+ is_signed ? "S" : "U",
+ rd, rn, immed,
+ (int) (opcode & 0x1f) + 1);
+ return ERROR_OK;
+ case 0x16:
+ immed = (opcode >> 6) & 0x03;
+ immed |= (opcode >> 10) & 0x1c;
+ if (rn == 0xf) /* bitfield clear */
+ sprintf(cp, "BFC\tr%d, #%d, #%d\t",
+ rd, immed,
+ (int) (opcode & 0x1f) + 1 - immed);
+ else /* bitfield insert */
+ sprintf(cp, "BFI\tr%d, r%d, #%d, #%d\t",
+ rd, rn, immed,
+ (int) (opcode & 0x1f) + 1 - immed);
+ return ERROR_OK;
+ default:
+ return ERROR_INVALID_ARGUMENTS;
+ }
+
+ sprintf(cp, "%s\tr%d, r%d, #%d\t; %#3.3x", mnemonic,
+ rd, rn, immed, immed);
+ return ERROR_OK;
+
+do_adr:
+ address = thumb_alignpc4(address);
+ if (add)
+ address += immed;
+ else
+ address -= immed;
+ /* REVISIT "ADD/SUB Rd, PC, #const ; 0x..." might be better;
+ * not hiding the pc-relative stuff will sometimes be useful.
+ */
+ sprintf(cp, "ADR.W\tr%d, %#8.8" PRIx32, rd, address);
+ return ERROR_OK;
+}
+
+static int t2ev_store_single(uint32_t opcode, uint32_t address,
+ struct arm_instruction *instruction, char *cp)
+{
+ unsigned op = (opcode >> 20) & 0xf;
+ char *size = "";
+ char *suffix = "";
+ char *p1 = "";
+ char *p2 = "]";
+ unsigned immed;
+ unsigned rn = (opcode >> 16) & 0x0f;
+ unsigned rt = (opcode >> 12) & 0x0f;
+
+ if (rn == 0xf)
+ return ERROR_INVALID_ARGUMENTS;
+
+ if (opcode & 0x0800)
+ op |= 1;
+ switch (op) {
+ /* byte */
+ case 0x8:
+ case 0x9:
+ size = "B";
+ goto imm12;
+ case 0x1:
+ size = "B";
+ goto imm8;
+ case 0x0:
+ size = "B";
+ break;
+ /* halfword */
+ case 0xa:
+ case 0xb:
+ size = "H";
+ goto imm12;
+ case 0x3:
+ size = "H";
+ goto imm8;
+ case 0x2:
+ size = "H";
+ break;
+ /* word */
+ case 0xc:
+ case 0xd:
+ goto imm12;
+ case 0x5:
+ goto imm8;
+ case 0x4:
+ break;
+ /* error */
+ default:
+ return ERROR_INVALID_ARGUMENTS;
+ }
+
+ sprintf(cp, "STR%s.W\tr%d, [r%d, r%d, LSL #%d]",
+ size, rt, rn, (int) opcode & 0x0f,
+ (int) (opcode >> 4) & 0x03);
+ return ERROR_OK;
+
+imm12:
+ immed = opcode & 0x0fff;
+ sprintf(cp, "STR%s.W\tr%d, [r%d, #%u]\t; %#3.3x",
+ size, rt, rn, immed, immed);
+ return ERROR_OK;
+
+imm8:
+ immed = opcode & 0x00ff;
+
+ switch (opcode & 0x700) {
+ case 0x600:
+ suffix = "T";
+ break;
+ case 0x000:
+ case 0x200:
+ return ERROR_INVALID_ARGUMENTS;
+ }
+
+ /* two indexed modes will write back rn */
+ if (opcode & 0x100) {
+ if (opcode & 0x400) /* pre-indexed */
+ p2 = "]!";
+ else { /* post-indexed */
+ p1 = "]";
+ p2 = "";
+ }
+ }
+
+ sprintf(cp, "STR%s%s\tr%d, [r%d%s, #%s%u%s\t; %#2.2x",
+ size, suffix, rt, rn, p1,
+ (opcode & 0x200) ? "" : "-",
+ immed, p2, immed);
+ return ERROR_OK;
+}
+
+static int t2ev_mul32(uint32_t opcode, uint32_t address,
+ struct arm_instruction *instruction, char *cp)
+{
+ int ra = (opcode >> 12) & 0xf;
+
+ switch (opcode & 0x007000f0) {
+ case 0:
+ if (ra == 0xf)
+ sprintf(cp, "MUL\tr%d, r%d, r%d",
+ (int) (opcode >> 8) & 0xf,
+ (int) (opcode >> 16) & 0xf,
+ (int) (opcode >> 0) & 0xf);
+ else
+ sprintf(cp, "MLA\tr%d, r%d, r%d, r%d",
+ (int) (opcode >> 8) & 0xf,
+ (int) (opcode >> 16) & 0xf,
+ (int) (opcode >> 0) & 0xf, ra);
+ break;
+ case 0x10:
+ sprintf(cp, "MLS\tr%d, r%d, r%d, r%d",
+ (int) (opcode >> 8) & 0xf,
+ (int) (opcode >> 16) & 0xf,
+ (int) (opcode >> 0) & 0xf, ra);
+ break;
+ default:
+ return ERROR_INVALID_ARGUMENTS;
+ }
+ return ERROR_OK;
+}
+
+static int t2ev_mul64_div(uint32_t opcode, uint32_t address,
+ struct arm_instruction *instruction, char *cp)
+{
+ int op = (opcode >> 4) & 0xf;
+ char *infix = "MUL";
+
+ op += (opcode >> 16) & 0x70;
+ switch (op) {
+ case 0x40:
+ case 0x60:
+ infix = "MLA";
+ /* FALLTHROUGH */
+ case 0:
+ case 0x20:
+ sprintf(cp, "%c%sL\tr%d, r%d, r%d, r%d",
+ (op & 0x20) ? 'U' : 'S',
+ infix,
+ (int) (opcode >> 12) & 0xf,
+ (int) (opcode >> 8) & 0xf,
+ (int) (opcode >> 16) & 0xf,
+ (int) (opcode >> 0) & 0xf);
+ break;
+ case 0x1f:
+ case 0x3f:
+ sprintf(cp, "%cDIV\tr%d, r%d, r%d",
+ (op & 0x20) ? 'U' : 'S',
+ (int) (opcode >> 8) & 0xf,
+ (int) (opcode >> 16) & 0xf,
+ (int) (opcode >> 0) & 0xf);
+ break;
+ default:
+ return ERROR_INVALID_ARGUMENTS;
+ }
+
+ return ERROR_OK;
+}
+
+static int t2ev_ldm_stm(uint32_t opcode, uint32_t address,
+ struct arm_instruction *instruction, char *cp)
+{
+ int rn = (opcode >> 16) & 0xf;
+ int op = (opcode >> 22) & 0x6;
+ int t = (opcode >> 21) & 1;
+ unsigned registers = opcode & 0xffff;
+ char *mode = "";
+
+ if (opcode & (1 << 20))
+ op |= 1;
+
+ switch (op) {
+ case 0:
+ mode = "DB";
+ /* FALL THROUGH */
+ case 6:
+ sprintf(cp, "SRS%s\tsp%s, #%d", mode,
+ t ? "!" : "",
+ (unsigned) (opcode & 0x1f));
+ return ERROR_OK;
+ case 1:
+ mode = "DB";
+ /* FALL THROUGH */
+ case 7:
+ sprintf(cp, "RFE%s\tr%d%s", mode,
+ (unsigned) ((opcode >> 16) & 0xf),
+ t ? "!" : "");
+ return ERROR_OK;
+ case 2:
+ sprintf(cp, "STM.W\tr%d%s, ", rn, t ? "!" : "");
+ break;
+ case 3:
+ if (rn == 13 && t)
+ sprintf(cp, "POP.W\t");
+ else
+ sprintf(cp, "LDM.W\tr%d%s, ", rn, t ? "!" : "");
+ break;
+ case 4:
+ if (rn == 13 && t)
+ sprintf(cp, "PUSH.W\t");
+ else
+ sprintf(cp, "STMDB\tr%d%s, ", rn, t ? "!" : "");
+ break;
+ case 5:
+ sprintf(cp, "LDMDB.W\tr%d%s, ", rn, t ? "!" : "");
+ break;
+ default:
+ return ERROR_INVALID_ARGUMENTS;
+ }
+
+ cp = strchr(cp, 0);
+ *cp++ = '{';
+ for (t = 0; registers; t++, registers >>= 1) {
+ if ((registers & 1) == 0)
+ continue;
+ registers &= ~1;
+ sprintf(cp, "r%d%s", t, registers ? ", " : "");
+ cp = strchr(cp, 0);
+ }
+ *cp++ = '}';
+ *cp++ = 0;
+
+ return ERROR_OK;
+}
+
+/* load/store dual or exclusive, table branch */
+static int t2ev_ldrex_strex(uint32_t opcode, uint32_t address,
+ struct arm_instruction *instruction, char *cp)
+{
+ unsigned op1op2 = (opcode >> 20) & 0x3;
+ unsigned op3 = (opcode >> 4) & 0xf;
+ char *mnemonic;
+ unsigned rn = (opcode >> 16) & 0xf;
+ unsigned rt = (opcode >> 12) & 0xf;
+ unsigned rd = (opcode >> 8) & 0xf;
+ unsigned imm = opcode & 0xff;
+ char *p1 = "";
+ char *p2 = "]";
+
+ op1op2 |= (opcode >> 21) & 0xc;
+ switch (op1op2) {
+ case 0:
+ mnemonic = "STREX";
+ goto strex;
+ case 1:
+ mnemonic = "LDREX";
+ goto ldrex;
+ case 2:
+ case 6:
+ case 8:
+ case 10:
+ case 12:
+ case 14:
+ mnemonic = "STRD";
+ goto immediate;
+ case 3:
+ case 7:
+ case 9:
+ case 11:
+ case 13:
+ case 15:
+ mnemonic = "LDRD";
+ if (rn == 15)
+ goto literal;
+ else
+ goto immediate;
+ case 4:
+ switch (op3) {
+ case 4:
+ mnemonic = "STREXB";
+ break;
+ case 5:
+ mnemonic = "STREXH";
+ break;
+ default:
+ return ERROR_INVALID_ARGUMENTS;
+ }
+ rd = opcode & 0xf;
+ imm = 0;
+ goto strex;
+ case 5:
+ switch (op3) {
+ case 0:
+ sprintf(cp, "TBB\t[r%u, r%u]", rn, imm & 0xf);
+ return ERROR_OK;
+ case 1:
+ sprintf(cp, "TBH\t[r%u, r%u, LSL #1]", rn, imm & 0xf);
+ return ERROR_OK;
+ case 4:
+ mnemonic = "LDREXB";
+ break;
+ case 5:
+ mnemonic = "LDREXH";
+ break;
+ default:
+ return ERROR_INVALID_ARGUMENTS;
+ }
+ imm = 0;
+ goto ldrex;
+ }
+ return ERROR_INVALID_ARGUMENTS;
+
+strex:
+ imm <<= 2;
+ if (imm)
+ sprintf(cp, "%s\tr%u, r%u, [r%u, #%u]\t; %#2.2x",
+ mnemonic, rd, rt, rn, imm, imm);
+ else
+ sprintf(cp, "%s\tr%u, r%u, [r%u]",
+ mnemonic, rd, rt, rn);
+ return ERROR_OK;
+
+ldrex:
+ imm <<= 2;
+ if (imm)
+ sprintf(cp, "%s\tr%u, [r%u, #%u]\t; %#2.2x",
+ mnemonic, rt, rn, imm, imm);
+ else
+ sprintf(cp, "%s\tr%u, [r%u]",
+ mnemonic, rt, rn);
+ return ERROR_OK;
+
+immediate:
+ /* two indexed modes will write back rn */
+ if (opcode & (1 << 21)) {
+ if (opcode & (1 << 24)) /* pre-indexed */
+ p2 = "]!";
+ else { /* post-indexed */
+ p1 = "]";
+ p2 = "";
+ }
+ }
+
+ imm <<= 2;
+ sprintf(cp, "%s\tr%u, r%u, [r%u%s, #%s%u%s\t; %#2.2x",
+ mnemonic, rt, rd, rn, p1,
+ (opcode & (1 << 23)) ? "" : "-",
+ imm, p2, imm);
+ return ERROR_OK;
+
+literal:
+ address = thumb_alignpc4(address);
+ imm <<= 2;
+ if (opcode & (1 << 23))
+ address += imm;
+ else
+ address -= imm;
+ sprintf(cp, "%s\tr%u, r%u, %#8.8" PRIx32,
+ mnemonic, rt, rd, address);
+ return ERROR_OK;
+}
+
+static int t2ev_data_shift(uint32_t opcode, uint32_t address,
+ struct arm_instruction *instruction, char *cp)
+{
+ int op = (opcode >> 21) & 0xf;
+ int rd = (opcode >> 8) & 0xf;
+ int rn = (opcode >> 16) & 0xf;
+ int type = (opcode >> 4) & 0x3;
+ int immed = (opcode >> 6) & 0x3;
+ char *mnemonic;
+ char *suffix = "";
+
+ immed |= (opcode >> 10) & 0x1c;
+ if (opcode & (1 << 20))
+ suffix = "S";
+
+ switch (op) {
+ case 0:
+ if (rd == 0xf) {
+ if (!(opcode & (1 << 20)))
+ return ERROR_INVALID_ARGUMENTS;
+ instruction->type = ARM_TST;
+ mnemonic = "TST";
+ suffix = "";
+ goto two;
+ }
+ instruction->type = ARM_AND;
+ mnemonic = "AND";
+ break;
+ case 1:
+ instruction->type = ARM_BIC;
+ mnemonic = "BIC";
+ break;
+ case 2:
+ if (rn == 0xf) {
+ instruction->type = ARM_MOV;
+ switch (type) {
+ case 0:
+ if (immed == 0) {
+ sprintf(cp, "MOV%s.W\tr%d, r%d",
+ suffix, rd,
+ (int) (opcode & 0xf));
+ return ERROR_OK;
+ }
+ mnemonic = "LSL";
+ break;
+ case 1:
+ mnemonic = "LSR";
+ break;
+ case 2:
+ mnemonic = "ASR";
+ break;
+ default:
+ if (immed == 0) {
+ sprintf(cp, "RRX%s\tr%d, r%d",
+ suffix, rd,
+ (int) (opcode & 0xf));
+ return ERROR_OK;
+ }
+ mnemonic = "ROR";
+ break;
+ }
+ goto immediate;
+ } else {
+ instruction->type = ARM_ORR;
+ mnemonic = "ORR";
+ }
+ break;
+ case 3:
+ if (rn == 0xf) {
+ instruction->type = ARM_MVN;
+ mnemonic = "MVN";
+ rn = rd;
+ goto two;
+ } else {
+ // instruction->type = ARM_ORN;
+ mnemonic = "ORN";
+ }
+ break;
+ case 4:
+ if (rd == 0xf) {
+ if (!(opcode & (1 << 20)))
+ return ERROR_INVALID_ARGUMENTS;
+ instruction->type = ARM_TEQ;
+ mnemonic = "TEQ";
+ suffix = "";
+ goto two;
+ }
+ instruction->type = ARM_EOR;
+ mnemonic = "EOR";
+ break;
+ case 8:
+ if (rd == 0xf) {
+ if (!(opcode & (1 << 20)))
+ return ERROR_INVALID_ARGUMENTS;
+ instruction->type = ARM_CMN;
+ mnemonic = "CMN";
+ suffix = "";
+ goto two;
+ }
+ instruction->type = ARM_ADD;
+ mnemonic = "ADD";
+ break;
+ case 0xa:
+ instruction->type = ARM_ADC;
+ mnemonic = "ADC";
+ break;
+ case 0xb:
+ instruction->type = ARM_SBC;
+ mnemonic = "SBC";
+ break;
+ case 0xd:
+ if (rd == 0xf) {
+ if (!(opcode & (1 << 21)))
+ return ERROR_INVALID_ARGUMENTS;
+ instruction->type = ARM_CMP;
+ mnemonic = "CMP";
+ suffix = "";
+ goto two;
+ }
+ instruction->type = ARM_SUB;
+ mnemonic = "SUB";
+ break;
+ case 0xe:
+ instruction->type = ARM_RSB;
+ mnemonic = "RSB";
+ break;
+ default:
+ return ERROR_INVALID_ARGUMENTS;
+ }
+
+ sprintf(cp, "%s%s.W\tr%d, r%d, r%d",
+ mnemonic, suffix, rd, rn, (int) (opcode & 0xf));
+
+shift:
+ cp = strchr(cp, 0);
+
+ switch (type) {
+ case 0:
+ if (immed == 0)
+ return ERROR_OK;
+ suffix = "LSL";
+ break;
+ case 1:
+ suffix = "LSR";
+ if (immed == 32)
+ immed = 0;
+ break;
+ case 2:
+ suffix = "ASR";
+ if (immed == 32)
+ immed = 0;
+ break;
+ case 3:
+ if (immed == 0) {
+ strcpy(cp, ", RRX");
+ return ERROR_OK;
+ }
+ suffix = "ROR";
+ break;
+ }
+ sprintf(cp, ", %s #%d", suffix, immed ? immed : 32);
+ return ERROR_OK;
+
+two:
+ sprintf(cp, "%s%s.W\tr%d, r%d",
+ mnemonic, suffix, rn, (int) (opcode & 0xf));
+ goto shift;
+
+immediate:
+ sprintf(cp, "%s%s.W\tr%d, r%d, #%d",
+ mnemonic, suffix, rd,
+ (int) (opcode & 0xf), immed ? immed : 32);
+ return ERROR_OK;
+}
+
+static int t2ev_data_reg(uint32_t opcode, uint32_t address,
+ struct arm_instruction *instruction, char *cp)
+{
+ char *mnemonic;
+ char * suffix = "";
+
+ if (((opcode >> 4) & 0xf) == 0) {
+ switch ((opcode >> 21) & 0x7) {
+ case 0:
+ mnemonic = "LSL";
+ break;
+ case 1:
+ mnemonic = "LSR";
+ break;
+ case 2:
+ mnemonic = "ASR";
+ break;
+ case 3:
+ mnemonic = "ROR";
+ break;
+ default:
+ return ERROR_INVALID_ARGUMENTS;
+ }
+
+ instruction->type = ARM_MOV;
+ if (opcode & (1 << 20))
+ suffix = "S";
+ sprintf(cp, "%s%s.W\tr%d, r%d, r%d",
+ mnemonic, suffix,
+ (int) (opcode >> 8) & 0xf,
+ (int) (opcode >> 16) & 0xf,
+ (int) (opcode >> 0) & 0xf);
+
+ } else if (opcode & (1 << 7)) {
+ switch ((opcode >> 20) & 0xf) {
+ case 0:
+ case 1:
+ case 4:
+ case 5:
+ switch ((opcode >> 4) & 0x3) {
+ case 1:
+ suffix = ", ROR #8";
+ break;
+ case 2:
+ suffix = ", ROR #16";
+ break;
+ case 3:
+ suffix = ", ROR #24";
+ break;
+ }
+ sprintf(cp, "%cXT%c.W\tr%d, r%d%s",
+ (opcode & (1 << 24)) ? 'U' : 'S',
+ (opcode & (1 << 26)) ? 'B' : 'H',
+ (int) (opcode >> 8) & 0xf,
+ (int) (opcode >> 0) & 0xf,
+ suffix);
+ break;
+ case 8:
+ case 9:
+ case 0xa:
+ case 0xb:
+ if (opcode & (1 << 6))
+ return ERROR_INVALID_ARGUMENTS;
+ if (((opcode >> 12) & 0xf) != 0xf)
+ return ERROR_INVALID_ARGUMENTS;
+ if (!(opcode & (1 << 20)))
+ return ERROR_INVALID_ARGUMENTS;
+
+ switch (((opcode >> 19) & 0x04)
+ | ((opcode >> 4) & 0x3)) {
+ case 0:
+ mnemonic = "REV.W";
+ break;
+ case 1:
+ mnemonic = "REV16.W";
+ break;
+ case 2:
+ mnemonic = "RBIT";
+ break;
+ case 3:
+ mnemonic = "REVSH.W";
+ break;
+ case 4:
+ mnemonic = "CLZ";
+ break;
+ default:
+ return ERROR_INVALID_ARGUMENTS;
+ }
+ sprintf(cp, "%s\tr%d, r%d",
+ mnemonic,
+ (int) (opcode >> 8) & 0xf,
+ (int) (opcode >> 0) & 0xf);
+ break;
+ default:
+ return ERROR_INVALID_ARGUMENTS;
+ }
+ }
+
+ return ERROR_OK;
+}
+
+static int t2ev_load_word(uint32_t opcode, uint32_t address,
+ struct arm_instruction *instruction, char *cp)
+{
+ int rn = (opcode >> 16) & 0xf;
+ int immed;
+
+ instruction->type = ARM_LDR;
+
+ if (rn == 0xf) {
+ immed = opcode & 0x0fff;
+ if ((opcode & (1 << 23)) == 0)
+ immed = -immed;
+ sprintf(cp, "LDR\tr%d, %#8.8" PRIx32,
+ (int) (opcode >> 12) & 0xf,
+ thumb_alignpc4(address) + immed);
+ return ERROR_OK;
+ }
+
+ if (opcode & (1 << 23)) {
+ immed = opcode & 0x0fff;
+ sprintf(cp, "LDR.W\tr%d, [r%d, #%d]\t; %#3.3x",
+ (int) (opcode >> 12) & 0xf,
+ rn, immed, immed);
+ return ERROR_OK;
+ }
+
+ if (!(opcode & (0x3f << 6))) {
+ sprintf(cp, "LDR.W\tr%d, [r%d, r%d, LSL #%d]",
+ (int) (opcode >> 12) & 0xf,
+ rn,
+ (int) (opcode >> 0) & 0xf,
+ (int) (opcode >> 4) & 0x3);
+ return ERROR_OK;
+ }
+
+
+ if (((opcode >> 8) & 0xf) == 0xe) {
+ immed = opcode & 0x00ff;
+
+ sprintf(cp, "LDRT\tr%d, [r%d, #%d]\t; %#2.2x",
+ (int) (opcode >> 12) & 0xf,
+ rn, immed, immed);
+ return ERROR_OK;
+ }
+
+ if (((opcode >> 8) & 0xf) == 0xc || (opcode & 0x0900) == 0x0900) {
+ char *p1 = "]", *p2 = "";
+
+ if (!(opcode & 0x0500))
+ return ERROR_INVALID_ARGUMENTS;
+
+ immed = opcode & 0x00ff;
+
+ /* two indexed modes will write back rn */
+ if (opcode & 0x100) {
+ if (opcode & 0x400) /* pre-indexed */
+ p2 = "]!";
+ else { /* post-indexed */
+ p1 = "]";
+ p2 = "";
+ }
+ }
+
+ sprintf(cp, "LDR\tr%d, [r%d%s, #%s%u%s\t; %#2.2x",
+ (int) (opcode >> 12) & 0xf,
+ rn, p1,
+ (opcode & 0x200) ? "" : "-",
+ immed, p2, immed);
+ return ERROR_OK;
+ }
+
+ return ERROR_INVALID_ARGUMENTS;
+}
+
+static int t2ev_load_byte_hints(uint32_t opcode, uint32_t address,
+ struct arm_instruction *instruction, char *cp)
+{
+ int rn = (opcode >> 16) & 0xf;
+ int rt = (opcode >> 12) & 0xf;
+ int op2 = (opcode >> 6) & 0x3f;
+ unsigned immed;
+ char *p1 = "", *p2 = "]";
+ char *mnemonic;
+
+ switch ((opcode >> 23) & 0x3) {
+ case 0:
+ if ((rn & rt) == 0xf) {
+pld_literal:
+ immed = opcode & 0xfff;
+ address = thumb_alignpc4(address);
+ if (opcode & (1 << 23))
+ address += immed;
+ else
+ address -= immed;
+ sprintf(cp, "PLD\tr%d, %#8.8" PRIx32,
+ rt, address);
+ return ERROR_OK;
+ }
+ if (rn == 0x0f && rt != 0x0f) {
+ldrb_literal:
+ immed = opcode & 0xfff;
+ address = thumb_alignpc4(address);
+ if (opcode & (1 << 23))
+ address += immed;
+ else
+ address -= immed;
+ sprintf(cp, "LDRB\tr%d, %#8.8" PRIx32,
+ rt, address);
+ return ERROR_OK;
+ }
+ if (rn == 0x0f)
+ break;
+ if ((op2 & 0x3c) == 0x38) {
+ immed = opcode & 0xff;
+ sprintf(cp, "LDRBT\tr%d, [r%d, #%d]\t; %#2.2x",
+ rt, rn, immed, immed);
+ return ERROR_OK;
+ }
+ if ((op2 & 0x3c) == 0x30) {
+ if (rt == 0x0f) {
+ immed = opcode & 0xff;
+ immed = -immed;
+preload_immediate:
+ p1 = (opcode & (1 << 21)) ? "W" : "";
+ sprintf(cp, "PLD%s\t[r%d, #%d]\t; %#6.6x",
+ p1, rn, immed, immed);
+ return ERROR_OK;
+ }
+ mnemonic = "LDRB";
+ldrxb_immediate_t3:
+ immed = opcode & 0xff;
+ if (!(opcode & 0x200))
+ immed = -immed;
+
+ /* two indexed modes will write back rn */
+ if (opcode & 0x100) {
+ if (opcode & 0x400) /* pre-indexed */
+ p2 = "]!";
+ else { /* post-indexed */
+ p1 = "]";
+ p2 = "";
+ }
+ }
+ldrxb_immediate_t2:
+ sprintf(cp, "%s\tr%d, [r%d%s, #%d%s\t; %#8.8x",
+ mnemonic, rt, rn, p1,
+ immed, p2, immed);
+ return ERROR_OK;
+ }
+ if ((op2 & 0x24) == 0x24) {
+ mnemonic = "LDRB";
+ goto ldrxb_immediate_t3;
+ }
+ if (op2 == 0) {
+ int rm = opcode & 0xf;
+
+ if (rt == 0x0f)
+ sprintf(cp, "PLD\t");
+ else
+ sprintf(cp, "LDRB.W\tr%d, ", rt);
+ immed = (opcode >> 4) & 0x3;
+ cp = strchr(cp, 0);
+ sprintf(cp, "[r%d, r%d, LSL #%d]", rn, rm, immed);
+ return ERROR_OK;
+ }
+ break;
+ case 1:
+ if ((rn & rt) == 0xf)
+ goto pld_literal;
+ if (rt == 0xf) {
+ immed = opcode & 0xfff;
+ goto preload_immediate;
+ }
+ if (rn == 0x0f)
+ goto ldrb_literal;
+ mnemonic = "LDRB.W";
+ immed = opcode & 0xfff;
+ goto ldrxb_immediate_t2;
+ case 2:
+ if ((rn & rt) == 0xf) {
+ immed = opcode & 0xfff;
+ address = thumb_alignpc4(address);
+ if (opcode & (1 << 23))
+ address += immed;
+ else
+ address -= immed;
+ sprintf(cp, "PLI\t%#8.8" PRIx32, address);
+ return ERROR_OK;
+ }
+ if (rn == 0xf && rt != 0xf) {
+ldrsb_literal:
+ immed = opcode & 0xfff;
+ address = thumb_alignpc4(address);
+ if (opcode & (1 << 23))
+ address += immed;
+ else
+ address -= immed;
+ sprintf(cp, "LDRSB\t%#8.8" PRIx32, address);
+ return ERROR_OK;
+ }
+ if (rn == 0xf)
+ break;
+ if ((op2 & 0x3c) == 0x38) {
+ immed = opcode & 0xff;
+ sprintf(cp, "LDRSBT\tr%d, [r%d, #%d]\t; %#2.2x",
+ rt, rn, immed, immed);
+ return ERROR_OK;
+ }
+ if ((op2 & 0x3c) == 0x30) {
+ if (rt == 0xf) {
+ immed = opcode & 0xff;
+ immed = -immed; // pli
+ sprintf(cp, "PLI\t[r%d, #%d]\t; -%#2.2x",
+ rn, immed, -immed);
+ return ERROR_OK;
+ }
+ mnemonic = "LDRSB";
+ goto ldrxb_immediate_t3;
+ }
+ if ((op2 & 0x24) == 0x24) {
+ mnemonic = "LDRSB";
+ goto ldrxb_immediate_t3;
+ }
+ if (op2 == 0) {
+ int rm = opcode & 0xf;
+
+ if (rt == 0x0f)
+ sprintf(cp, "PLI\t");
+ else
+ sprintf(cp, "LDRSB.W\tr%d, ", rt);
+ immed = (opcode >> 4) & 0x3;
+ cp = strchr(cp, 0);
+ sprintf(cp, "[r%d, r%d, LSL #%d]", rn, rm, immed);
+ return ERROR_OK;
+ }
+ break;
+ case 3:
+ if (rt == 0xf) {
+ immed = opcode & 0xfff;
+ sprintf(cp, "PLI\t[r%d, #%d]\t; %#3.3x",
+ rn, immed, immed);
+ return ERROR_OK;
+ }
+ if (rn == 0xf)
+ goto ldrsb_literal;
+ immed = opcode & 0xfff;
+ mnemonic = "LDRSB";
+ goto ldrxb_immediate_t2;
+ }
+
+ return ERROR_INVALID_ARGUMENTS;
+}
+
+static int t2ev_load_halfword(uint32_t opcode, uint32_t address,
+ struct arm_instruction *instruction, char *cp)
+{
+ int rn = (opcode >> 16) & 0xf;
+ int rt = (opcode >> 12) & 0xf;
+ int op2 = (opcode >> 6) & 0x3f;
+ char *sign = "";
+ unsigned immed;
+
+ if (rt == 0xf) {
+ sprintf(cp, "HINT (UNALLOCATED)");
+ return ERROR_OK;
+ }
+
+ if (opcode & (1 << 24))
+ sign = "S";
+
+ if ((opcode & (1 << 23)) == 0) {
+ if (rn == 0xf) {
+ldrh_literal:
+ immed = opcode & 0xfff;
+ address = thumb_alignpc4(address);
+ if (opcode & (1 << 23))
+ address += immed;
+ else
+ address -= immed;
+ sprintf(cp, "LDR%sH\tr%d, %#8.8" PRIx32,
+ sign, rt, address);
+ return ERROR_OK;
+ }
+ if (op2 == 0) {
+ int rm = opcode & 0xf;
+
+ immed = (opcode >> 4) & 0x3;
+ sprintf(cp, "LDR%sH.W\tr%d, [r%d, r%d, LSL #%d]",
+ sign, rt, rn, rm, immed);
+ return ERROR_OK;
+ }
+ if ((op2 & 0x3c) == 0x38) {
+ immed = opcode & 0xff;
+ sprintf(cp, "LDR%sHT\tr%d, [r%d, #%d]\t; %#2.2x",
+ sign, rt, rn, immed, immed);
+ return ERROR_OK;
+ }
+ if ((op2 & 0x3c) == 0x30 || (op2 & 0x24) == 0x24) {
+ char *p1 = "", *p2 = "]";
+
+ immed = opcode & 0xff;
+ if (!(opcode & 0x200))
+ immed = -immed;
+
+ /* two indexed modes will write back rn */
+ if (opcode & 0x100) {
+ if (opcode & 0x400) /* pre-indexed */
+ p2 = "]!";
+ else { /* post-indexed */
+ p1 = "]";
+ p2 = "";
+ }
+ }
+ sprintf(cp, "LDR%sH\tr%d, [r%d%s, #%d%s\t; %#8.8x",
+ sign, rt, rn, p1, immed, p2, immed);
+ return ERROR_OK;
+ }
+ } else {
+ if (rn == 0xf)
+ goto ldrh_literal;
+
+ immed = opcode & 0xfff;
+ sprintf(cp, "LDR%sH%s\tr%d, [r%d, #%d]\t; %#6.6x",
+ sign, *sign ? "" : ".W",
+ rt, rn, immed, immed);
+ return ERROR_OK;
+ }
+
+ return ERROR_INVALID_ARGUMENTS;
+}
+
+/*
+ * REVISIT for Thumb2 instructions, instruction->type and friends aren't
+ * always set. That means eventual arm_simulate_step() support for Thumb2
+ * will need work in this area.
+ */
+int thumb2_opcode(struct target *target, uint32_t address, struct arm_instruction *instruction)
+{
+ int retval;
+ uint16_t op;
+ uint32_t opcode;
+ char *cp;
+
+ /* clear low bit ... it's set on function pointers */
+ address &= ~1;
+
+ /* clear fields, to avoid confusion */
+ memset(instruction, 0, sizeof(struct arm_instruction));
+
+ /* read first halfword, see if this is the only one */
+ retval = target_read_u16(target, address, &op);
+ if (retval != ERROR_OK)
+ return retval;
+
+ switch (op & 0xf800) {
+ case 0xf800:
+ case 0xf000:
+ case 0xe800:
+ /* 32-bit instructions */
+ instruction->instruction_size = 4;
+ opcode = op << 16;
+ retval = target_read_u16(target, address + 2, &op);
+ if (retval != ERROR_OK)
+ return retval;
+ opcode |= op;
+ instruction->opcode = opcode;
+ break;
+ default:
+ /* 16-bit: Thumb1 + IT + CBZ/CBNZ + ... */
+ return thumb_evaluate_opcode(op, address, instruction);
+ }
+
+ snprintf(instruction->text, 128,
+ "0x%8.8" PRIx32 " 0x%8.8" PRIx32 "\t",
+ address, opcode);
+ cp = strchr(instruction->text, 0);
+ retval = ERROR_FAIL;
+
+ /* ARMv7-M: A5.3.1 Data processing (modified immediate) */
+ if ((opcode & 0x1a008000) == 0x10000000)
+ retval = t2ev_data_mod_immed(opcode, address, instruction, cp);
+
+ /* ARMv7-M: A5.3.3 Data processing (plain binary immediate) */
+ else if ((opcode & 0x1a008000) == 0x12000000)
+ retval = t2ev_data_immed(opcode, address, instruction, cp);
+
+ /* ARMv7-M: A5.3.4 Branches and miscellaneous control */
+ else if ((opcode & 0x18008000) == 0x10008000)
+ retval = t2ev_b_misc(opcode, address, instruction, cp);
+
+ /* ARMv7-M: A5.3.5 Load/store multiple */
+ else if ((opcode & 0x1e400000) == 0x08000000)
+ retval = t2ev_ldm_stm(opcode, address, instruction, cp);
+
+ /* ARMv7-M: A5.3.6 Load/store dual or exclusive, table branch */
+ else if ((opcode & 0x1e400000) == 0x08400000)
+ retval = t2ev_ldrex_strex(opcode, address, instruction, cp);
+
+ /* ARMv7-M: A5.3.7 Load word */
+ else if ((opcode & 0x1f700000) == 0x18500000)
+ retval = t2ev_load_word(opcode, address, instruction, cp);
+
+ /* ARMv7-M: A5.3.8 Load halfword, unallocated memory hints */
+ else if ((opcode & 0x1e700000) == 0x18300000)
+ retval = t2ev_load_halfword(opcode, address, instruction, cp);
+
+ /* ARMv7-M: A5.3.9 Load byte, memory hints */
+ else if ((opcode & 0x1e700000) == 0x18100000)
+ retval = t2ev_load_byte_hints(opcode, address, instruction, cp);
+
+ /* ARMv7-M: A5.3.10 Store single data item */
+ else if ((opcode & 0x1f100000) == 0x18000000)
+ retval = t2ev_store_single(opcode, address, instruction, cp);
+
+ /* ARMv7-M: A5.3.11 Data processing (shifted register) */
+ else if ((opcode & 0x1e000000) == 0x0a000000)
+ retval = t2ev_data_shift(opcode, address, instruction, cp);
+
+ /* ARMv7-M: A5.3.12 Data processing (register)
+ * and A5.3.13 Miscellaneous operations
+ */
+ else if ((opcode & 0x1f000000) == 0x1a000000)
+ retval = t2ev_data_reg(opcode, address, instruction, cp);
+
+ /* ARMv7-M: A5.3.14 Multiply, and multiply accumulate */
+ else if ((opcode & 0x1f800000) == 0x1b000000)
+ retval = t2ev_mul32(opcode, address, instruction, cp);
+
+ /* ARMv7-M: A5.3.15 Long multiply, long multiply accumulate, divide */
+ else if ((opcode & 0x1f800000) == 0x1b800000)
+ retval = t2ev_mul64_div(opcode, address, instruction, cp);
+
+ if (retval == ERROR_OK)
+ return retval;
+
+ /*
+ * Thumb2 also supports coprocessor, ThumbEE, and DSP/Media (SIMD)
+ * instructions; not yet handled here.
+ */
+
+ if (retval == ERROR_INVALID_ARGUMENTS) {
+ instruction->type = ARM_UNDEFINED_INSTRUCTION;
+ strcpy(cp, "UNDEFINED OPCODE");
+ return ERROR_OK;
+ }
+
+ LOG_DEBUG("Can't decode 32-bit Thumb2 yet (opcode=%08" PRIx32 ")",
+ opcode);
+
+ strcpy(cp, "(32-bit Thumb2 ...)");
+ return ERROR_OK;
+}
+
+int arm_access_size(struct arm_instruction *instruction)
+{
+ if ((instruction->type == ARM_LDRB)
+ || (instruction->type == ARM_LDRBT)
+ || (instruction->type == ARM_LDRSB)
+ || (instruction->type == ARM_STRB)
+ || (instruction->type == ARM_STRBT))
+ {
+ return 1;
+ }
+ else if ((instruction->type == ARM_LDRH)
+ || (instruction->type == ARM_LDRSH)
+ || (instruction->type == ARM_STRH))
+ {
+ return 2;
+ }
+ else if ((instruction->type == ARM_LDR)
+ || (instruction->type == ARM_LDRT)
+ || (instruction->type == ARM_STR)
+ || (instruction->type == ARM_STRT))
+ {
+ return 4;
+ }
+ else if ((instruction->type == ARM_LDRD)
+ || (instruction->type == ARM_STRD))
+ {
+ return 8;
+ }
+ else
+ {
+ LOG_ERROR("BUG: instruction type %i isn't a load/store instruction", instruction->type);
+ return 0;
+ }
+}
projects / fw / openocd / blobdiff