--- /dev/null
+/***************************************************************************
+ * Copyright (C) 2006 by Dominic Rath *
+ * Dominic.Rath@gmx.de *
+ * *
+ * 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 *
+ * (at your option) any later version. *
+ * *
+ * This program is distributed in the hope that it will be useful, *
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of *
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the *
+ * GNU General Public License for more details. *
+ * *
+ * You should have received a copy of the GNU General Public License *
+ * along with this program; if not, write to the *
+ * Free Software Foundation, Inc., *
+ * 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. *
+ ***************************************************************************/
+#include "arm_disassembler.h"
+
+#include "log.h"
+
+#include <strings.h>
+
+/* textual represenation of the condition field */
+/* ALways (default) is ommitted (empty string) */
+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));
+}
+
+int evaluate_pld(u32 opcode, u32 address, arm_instruction_t *instruction)
+{
+ /* PLD */
+ if ((opcode & 0x0d70f0000) == 0x0550f000)
+ {
+ instruction->type = ARM_PLD;
+
+ snprintf(instruction->text, 128, "0x%8.8x\t0x%8.8x\tPLD ...TODO...", address, opcode);
+
+ return ERROR_OK;
+ }
+ else
+ {
+ instruction->type = ARM_UNDEFINED_INSTRUCTION;
+ return ERROR_OK;
+ }
+
+ ERROR("should never reach this point");
+ return -1;
+}
+
+int evaluate_swi(u32 opcode, u32 address, arm_instruction_t *instruction)
+{
+ instruction->type = ARM_SWI;
+
+ snprintf(instruction->text, 128, "0x%8.8x\t0x%8.8x\tSWI 0x%6.6x", address, opcode, (opcode & 0xffffff));
+
+ return ERROR_OK;
+}
+
+int evaluate_blx_imm(u32 opcode, u32 address, arm_instruction_t *instruction)
+{
+ int offset;
+ u32 immediate;
+
+ 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;
+
+ instruction->target_address = address + 8 + offset;
+
+ snprintf(instruction->text, 128, "0x%8.8x\t0x%8.8x\tBLX 0x%8.8x", address, opcode, instruction->target_address);
+
+ return ERROR_OK;
+}
+
+int evaluate_b_bl(u32 opcode, u32 address, arm_instruction_t *instruction)
+{
+ u8 L;
+ u32 immediate;
+ int offset;
+
+ 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;
+
+ instruction->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,
+ (L) ? "L" : "", COND(opcode), instruction->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)
+{
+ u8 cp_num = (opcode & 0xf00) >> 8;
+
+ /* MCRR or MRRC */
+ if (((opcode & 0x0ff00000) == 0x0c400000) || ((opcode & 0x0ff00000) == 0x0c400000))
+ {
+ u8 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);
+ }
+ else /* LDC or STC */
+ {
+ u8 CRd, Rn, offset;
+ u8 U, N;
+ char *mnemonic;
+ char addressing_mode[32];
+
+ CRd = (opcode & 0xf000) >> 12;
+ Rn = (opcode & 0xf0000) >> 16;
+ offset = (opcode & 0xff);
+
+ /* load/store */
+ if (opcode & 0x00100000)
+ {
+ instruction->type = ARM_LDC;
+ mnemonic = "LDC";
+ }
+ else
+ {
+ 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);
+ else if ((opcode & 0x01200000) == 0x00000000) /* unindexed */
+ snprintf(addressing_mode, 32, "[r%i], #0x%2.2x", Rn, offset);
+
+ 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);
+ }
+
+ 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)
+{
+ char* cond;
+ char* mnemonic;
+ u8 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 */
+ {
+ if (opcode & 0x00100000) /* bit 20 set -> MRC */
+ {
+ instruction->type = ARM_MRC;
+ mnemonic = "MRC";
+ }
+ else /* bit 20 not set -> 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",
+ address, opcode, mnemonic, cond,
+ cp_num, opcode_1, CRd_Rd, CRn, CRm, opcode_2);
+ }
+ else /* bit 4 not set -> CDP */
+ {
+ 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",
+ 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)
+{
+ u8 I, P, U, B, W, L;
+ u8 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;
+ U = (opcode & 0x00800000) >> 23;
+ B = (opcode & 0x00400000) >> 22;
+ W = (opcode & 0x00200000) >> 21;
+ L = (opcode & 0x00100000) >> 20;
+
+ /* target register */
+ Rd = (opcode & 0xf000) >> 12;
+
+ /* base register */
+ Rn = (opcode & 0xf0000) >> 16;
+
+ /* determine operation */
+ if (L)
+ operation = "LDR";
+ else
+ operation = "STR";
+
+ /* determine instruction type and suffix */
+ if (B)
+ {
+ if ((P == 0) && (W == 1))
+ {
+ if (L)
+ instruction->type = ARM_LDRBT;
+ else
+ instruction->type = ARM_STRBT;
+ suffix = "BT";
+ }
+ else
+ {
+ if (L)
+ instruction->type = ARM_LDRB;
+ else
+ instruction->type = ARM_STRB;
+ suffix = "B";
+ }
+ }
+ else
+ {
+ if ((P == 0) && (W == 1))
+ {
+ if (L)
+ instruction->type = ARM_LDRT;
+ else
+ instruction->type = ARM_STRT;
+ suffix = "T";
+ }
+ else
+ {
+ if (L)
+ instruction->type = ARM_LDR;
+ else
+ instruction->type = ARM_STR;
+ suffix = "";
+ }
+ }
+
+ if (!I) /* #+-<offset_12> */
+ {
+ u32 offset_12 = (opcode & 0xfff);
+ snprintf(offset, 32, "#%s0x%x", (U) ? "" : "-", offset_12);
+ }
+ else /* either +-<Rm> or +-<Rm>, <shift>, #<shift_imm> */
+ {
+ u8 shift_imm, shift;
+ u8 Rm;
+
+ shift_imm = (opcode & 0xf80) >> 7;
+ shift = (opcode & 0x60) >> 5;
+ Rm = (opcode & 0xf);
+
+ if ((shift_imm == 0x0) && (shift == 0x0)) /* +-<Rm> */
+ {
+ snprintf(offset, 32, "%sr%i", (U) ? "" : "-", Rm);
+ }
+ else /* +-<Rm>, <Shift>, #<shift_imm> */
+ {
+ if (shift == 0x0) /* LSL */
+ {
+ snprintf(offset, 32, "%sr%i, LSL #0x%x", (U) ? "" : "-", Rm, shift_imm);
+ }
+ else if (shift == 0x1) /* LSR */
+ {
+ snprintf(offset, 32, "%sr%i, LSR #0x%x", (U) ? "" : "-", Rm, shift_imm);
+ }
+ else if (shift == 0x2) /* ASR */
+ {
+ snprintf(offset, 32, "%sr%i, ASR #0x%x", (U) ? "" : "-", Rm, shift_imm);
+ }
+ else if (shift == 0x3) /* ROR or RRX */
+ {
+ if (shift_imm == 0x0) /* RRX */
+ snprintf(offset, 32, "%sr%i, RRX", (U) ? "" : "-", Rm);
+ else
+ snprintf(offset, 32, "%sr%i, ROR #0x%x", (U) ? "" : "-", Rm, shift_imm);
+ }
+ }
+ }
+
+ 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]",
+ address, opcode, operation, COND(opcode), suffix,
+ Rd, Rn, offset);
+ }
+ else /* pre-indexed */
+ {
+ snprintf(instruction->text, 128, "0x%8.8x\t0x%8.8x\t%s%s%s r%i, [r%i, %s]!",
+ address, opcode, operation, COND(opcode), suffix,
+ Rd, Rn, offset);
+ }
+ }
+ else /* post-indexed */
+ {
+ snprintf(instruction->text, 128, "0x%8.8x\t0x%8.8x\t%s%s%s r%i, [r%i], %s",
+ address, opcode, operation, COND(opcode), suffix,
+ Rd, Rn, offset);
+ }
+
+ return ERROR_OK;
+}
+
+/* Miscellaneous load/store instructions */
+int evaluate_misc_load_store(u32 opcode, u32 address, arm_instruction_t *instruction)
+{
+ u8 P, U, I, W, L, S, H;
+ u8 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;
+ I = (opcode & 0x00400000) >> 22;
+ W = (opcode & 0x00200000) >> 21;
+ L = (opcode & 0x00100000) >> 20;
+ S = (opcode & 0x00000040) >> 6;
+ H = (opcode & 0x00000020) >> 5;
+
+ /* target register */
+ Rd = (opcode & 0xf000) >> 12;
+
+ /* base register */
+ Rn = (opcode & 0xf0000) >> 16;
+
+ /* determine instruction type and suffix */
+ if (S) /* signed */
+ {
+ if (L) /* load */
+ {
+ if (H)
+ {
+ operation = "LDR";
+ instruction->type = ARM_LDRSH;
+ suffix = "SH";
+ }
+ else
+ {
+ operation = "LDR";
+ instruction->type = ARM_LDRSB;
+ suffix = "SB";
+ }
+ }
+ else /* there are no signed stores, so this is used to encode double-register load/stores */
+ {
+ suffix = "D";
+ if (H)
+ {
+ operation = "STR";
+ instruction->type = ARM_STRD;
+ }
+ else
+ {
+ operation = "LDR";
+ instruction->type = ARM_LDRD;
+ }
+ }
+ }
+ else /* unsigned */
+ {
+ suffix = "H";
+ if (L) /* load */
+ {
+ operation = "LDR";
+ instruction->type = ARM_LDRH;
+ }
+ else /* store */
+ {
+ operation = "STR";
+ 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);
+ }
+ else /* Register offset/index (+-<Rm>) */
+ {
+ u8 Rm;
+ Rm = (opcode & 0xf);
+ snprintf(offset, 32, "%sr%i", (U) ? "" : "-", Rm);
+ }
+
+ 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]",
+ address, opcode, operation, COND(opcode), suffix,
+ Rd, Rn, offset);
+ }
+ else /* pre-indexed */
+ {
+ snprintf(instruction->text, 128, "0x%8.8x\t0x%8.8x\t%s%s%s r%i, [r%i, %s]!",
+ address, opcode, operation, COND(opcode), suffix,
+ Rd, Rn, offset);
+ }
+ }
+ else /* post-indexed */
+ {
+ snprintf(instruction->text, 128, "0x%8.8x\t0x%8.8x\t%s%s%s r%i, [r%i], %s",
+ address, opcode, operation, COND(opcode), suffix,
+ Rd, Rn, offset);
+ }
+
+ return ERROR_OK;
+}
+
+/* Load/store multiples instructions */
+int evaluate_ldm_stm(u32 opcode, u32 address, arm_instruction_t *instruction)
+{
+ u8 P, U, S, W, L, Rn;
+ u32 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;
+ W = (opcode & 0x00200000) >> 21;
+ L = (opcode & 0x00100000) >> 20;
+ register_list = (opcode & 0xffff);
+ Rn = (opcode & 0xf0000) >> 16;
+
+ if (L)
+ {
+ instruction->type = ARM_LDM;
+ mnemonic = "LDM";
+ }
+ else
+ {
+ instruction->type = ARM_STM;
+ mnemonic = "STM";
+ }
+
+ if (P)
+ {
+ if (U)
+ addressing_mode = "IB";
+ else
+ addressing_mode = "DB";
+ }
+ else
+ {
+ if (U)
+ addressing_mode = "IA";
+ else
+ addressing_mode = "DA";
+ }
+
+ reg_list_p = reg_list;
+ for (i = 0; i <= 15; i++)
+ {
+ if ((register_list >> i) & 1)
+ {
+ if (first_reg)
+ {
+ first_reg = 0;
+ reg_list_p += snprintf(reg_list_p, (reg_list + 69 - reg_list_p), "r%i", i);
+ }
+ else
+ {
+ reg_list_p += snprintf(reg_list_p, (reg_list + 69 - reg_list_p), ", r%i", 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,
+ 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)
+{
+ /* Multiply (accumulate) (long) and Swap/swap byte */
+ if ((opcode & 0x000000f0) == 0x00000090)
+ {
+ /* Multiply (accumulate) */
+ if ((opcode & 0x0f800000) == 0x00000000)
+ {
+ u8 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",
+ 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",
+ 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;
+ 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:
+ instruction->type = ARM_UMULL;
+ mnemonic = "UMULL";
+ break;
+ case 0x1:
+ instruction->type = ARM_UMLAL;
+ mnemonic = "UMLAL";
+ break;
+ case 0x2:
+ instruction->type = ARM_SMULL;
+ mnemonic = "SMULL";
+ break;
+ case 0x3:
+ instruction->type = ARM_SMLAL;
+ 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",
+ 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;
+ 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]",
+ 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)
+{
+ 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",
+ 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",
+ 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;
+
+ instruction->type = ARM_MRS;
+ Rd = (opcode & 0x0000f000) >> 12;
+
+ snprintf(instruction->text, 128, "0x%8.8x\t0x%8.8x\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)
+{
+ /* MRS/MSR */
+ if ((opcode & 0x000000f0) == 0x00000000)
+ {
+ evaluate_mrs_msr(opcode, address, instruction);
+ }
+
+ /* BX */
+ if ((opcode & 0x006000f0) == 0x00200010)
+ {
+ u8 Rm;
+ instruction->type = ARM_BX;
+ Rm = opcode & 0xf;
+
+ snprintf(instruction->text, 128, "0x%8.8x\t0x%8.8x\tBX%s r%i",
+ address, opcode, COND(opcode), Rm);
+ }
+
+ /* CLZ */
+ if ((opcode & 0x0060000f0) == 0x00300010)
+ {
+ u8 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",
+ address, opcode, COND(opcode), Rd, Rm);
+ }
+
+ /* BLX */
+ if ((opcode & 0x0060000f0) == 0x00200030)
+ {
+ u8 Rm;
+ instruction->type = ARM_BLX;
+ Rm = opcode & 0xf;
+
+ snprintf(instruction->text, 128, "0x%8.8x\t0x%8.8x\tBLX%s r%i",
+ address, opcode, COND(opcode), Rm);
+ }
+
+ /* Enhanced DSP add/subtracts */
+ if ((opcode & 0x0000000f0) == 0x00000050)
+ {
+ u8 Rm, Rd, Rn;
+ char *mnemonic;
+ Rm = opcode & 0xf;
+ Rd = (opcode & 0xf000) >> 12;
+ Rn = (opcode & 0xf0000) >> 16;
+
+ switch ((opcode & 0x00600000) >> 21)
+ {
+ case 0x0:
+ instruction->type = ARM_QADD;
+ mnemonic = "QADD";
+ break;
+ case 0x1:
+ instruction->type = ARM_QSUB;
+ mnemonic = "QSUB";
+ break;
+ case 0x2:
+ instruction->type = ARM_QDADD;
+ mnemonic = "QDADD";
+ break;
+ case 0x3:
+ instruction->type = ARM_QDSUB;
+ mnemonic = "QDSUB";
+ break;
+ }
+
+ snprintf(instruction->text, 128, "0x%8.8x\t0x%8.8x\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;
+ 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);
+ }
+
+ /* Enhanced DSP multiplies */
+ if ((opcode & 0x000000090) == 0x00000080)
+ {
+ int x = (opcode & 0x20) >> 5;
+ int y = (opcode & 0x40) >> 6;
+
+ /* SMLA<x><y> */
+ if ((opcode & 0x00600000) == 0x00000000)
+ {
+ u8 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",
+ address, opcode, (x) ? "T" : "B", (y) ? "T" : "B", COND(opcode),
+ Rd, Rm, Rs, Rn);
+ }
+
+ /* SMLAL<x><y> */
+ if ((opcode & 0x00600000) == 0x00400000)
+ {
+ u8 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",
+ address, opcode, (x) ? "T" : "B", (y) ? "T" : "B", COND(opcode),
+ RdLow, RdHi, Rm, Rs);
+ }
+
+ /* SMLAW<y> */
+ if (((opcode & 0x00600000) == 0x00100000) && (x == 0))
+ {
+ u8 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",
+ address, opcode, (y) ? "T" : "B", COND(opcode),
+ Rd, Rm, Rs, Rn);
+ }
+
+ /* SMUL<x><y> */
+ if ((opcode & 0x00600000) == 0x00300000)
+ {
+ u8 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",
+ address, opcode, (x) ? "T" : "B", (y) ? "T" : "B", COND(opcode),
+ Rd, Rm, Rs);
+ }
+
+ /* SMULW<y> */
+ if (((opcode & 0x00600000) == 0x00100000) && (x == 1))
+ {
+ u8 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",
+ 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)
+{
+ u8 I, op, S, Rn, Rd;
+ char *mnemonic;
+ char shifter_operand[32];
+
+ I = (opcode & 0x02000000) >> 25;
+ op = (opcode & 0x01e00000) >> 21;
+ S = (opcode & 0x00100000) >> 20;
+
+ Rd = (opcode & 0xf000) >> 12;
+ Rn = (opcode & 0xf0000) >> 16;
+
+ switch (op)
+ {
+ case 0x0:
+ instruction->type = ARM_AND;
+ mnemonic = "AND";
+ break;
+ case 0x1:
+ instruction->type = ARM_EOR;
+ mnemonic = "EOR";
+ break;
+ case 0x2:
+ instruction->type = ARM_SUB;
+ mnemonic = "SUB";
+ break;
+ case 0x3:
+ instruction->type = ARM_RSB;
+ mnemonic = "RSB";
+ break;
+ case 0x4:
+ instruction->type = ARM_ADD;
+ mnemonic = "ADD";
+ break;
+ case 0x5:
+ instruction->type = ARM_ADC;
+ mnemonic = "ADC";
+ break;
+ case 0x6:
+ instruction->type = ARM_SBC;
+ mnemonic = "SBC";
+ break;
+ case 0x7:
+ instruction->type = ARM_RSC;
+ mnemonic = "RSC";
+ break;
+ case 0x8:
+ instruction->type = ARM_TST;
+ mnemonic = "TST";
+ break;
+ case 0x9:
+ instruction->type = ARM_TEQ;
+ mnemonic = "TEQ";
+ 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 = "ORR";
+ break;
+ case 0xd:
+ instruction->type = ARM_MOV;
+ mnemonic = "MOV";
+ break;
+ case 0xe:
+ instruction->type = ARM_BIC;
+ mnemonic = "BIC";
+ break;
+ case 0xf:
+ instruction->type = ARM_MVN;
+ mnemonic = "MVN";
+ break;
+ }
+
+ if (I) /* immediate shifter operand (#<immediate>)*/
+ {
+ u8 immed_8 = opcode & 0xff;
+ u8 rotate_imm = (opcode & 0xf00) >> 8;
+ u32 immediate;
+
+ immediate = ror(immed_8, rotate_imm * 2);
+
+ snprintf(shifter_operand, 32, "#0x%x", immediate);
+ }
+ else /* register-based shifter operand */
+ {
+ u8 shift, Rm;
+ shift = (opcode & 0x60) >> 5;
+ Rm = (opcode & 0xf);
+
+ if ((opcode & 0x10) != 0x10) /* Immediate shifts ("<Rm>" or "<Rm>, <shift> #<shift_immediate>") */
+ {
+ u8 shift_imm;
+ shift_imm = (opcode & 0xf80) >> 7;
+
+
+ if ((shift_imm == 0x0) && (shift == 0x0))
+ {
+ snprintf(shifter_operand, 32, "r%i", Rm);
+ }
+ else
+ {
+ if (shift == 0x0) /* LSL */
+ {
+ snprintf(shifter_operand, 32, "r%i, LSL #0x%x", Rm, shift_imm);
+ }
+ 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 */
+ {
+ 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);
+ }
+ }
+ }
+ else /* Register shifts ("<Rm>, <shift> <Rs>") */
+ {
+ u8 Rs = (opcode & 0xf00) >> 8;
+
+ if (shift == 0x0) /* LSL */
+ {
+ snprintf(shifter_operand, 32, "r%i, LSL r%i", Rm, Rs);
+ }
+ else if (shift == 0x1) /* LSR */
+ {
+ snprintf(shifter_operand, 32, "r%i, LSR r%i", Rm, Rs);
+ }
+ else if (shift == 0x2) /* ASR */
+ {
+ snprintf(shifter_operand, 32, "r%i, ASR r%i", Rm, Rs);
+ }
+ else if (shift == 0x3) /* ROR or RRX */
+ {
+ 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",
+ 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",
+ 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",
+ address, opcode, mnemonic, COND(opcode),
+ Rn, shifter_operand);
+ }
+
+ return ERROR_OK;
+}
+
+int evaluate_opcode(u32 opcode, u32 address, arm_instruction_t *instruction)
+{
+ /* clear fields, to avoid confusion */
+ bzero(instruction, sizeof(arm_instruction_t));
+ instruction->opcode = opcode;
+
+ /* 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 */
+ 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;
+ }
+
+ /* 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 )*/
+ /* 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);
+ 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)
+ {
+ /* Undefined instruction */
+ if ((opcode & 0x0fb00000) == 0x03000000)
+ {
+ instruction->type = ARM_UNDEFINED_INSTRUCTION;
+ snprintf(instruction->text, 128, "0x%8.8x\t0x%8.8x\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)
+ {
+ /* Undefined instruction */
+ if ((opcode & 0x00000010) == 0x00000010)
+ {
+ instruction->type = ARM_UNDEFINED_INSTRUCTION;
+ snprintf(instruction->text, 128, "0x%8.8x\t0x%8.8x\tUNDEFINED INSTRUCTION", address, opcode);
+ return ERROR_OK;
+ }
+
+ /* Load/store register offset */
+ return evaluate_load_store(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)
+ {
+ /* 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");
+ return -1;
+}
projects / openocd / commitdiff