1 /* 2 * several functions that help interpret ARC instructions 3 * used for unaligned accesses, kprobes and kgdb 4 * 5 * Copyright (C) 2004, 2007-2010, 2011-2012 Synopsys, Inc. (www.synopsys.com) 6 * 7 * This program is free software; you can redistribute it and/or modify 8 * it under the terms of the GNU General Public License version 2 as 9 * published by the Free Software Foundation. 10 */ 11 12 #ifndef __ARC_DISASM_H__ 13 #define __ARC_DISASM_H__ 14 15 enum { 16 op_Bcc = 0, op_BLcc = 1, op_LD = 2, op_ST = 3, op_MAJOR_4 = 4, 17 op_MAJOR_5 = 5, op_LD_ADD = 12, op_ADD_SUB_SHIFT = 13, 18 op_ADD_MOV_CMP = 14, op_S = 15, op_LD_S = 16, op_LDB_S = 17, 19 op_LDW_S = 18, op_LDWX_S = 19, op_ST_S = 20, op_STB_S = 21, 20 op_STW_S = 22, op_Su5 = 23, op_SP = 24, op_GP = 25, 21 op_Pcl = 26, op_MOV_S = 27, op_ADD_CMP = 28, op_BR_S = 29, 22 op_B_S = 30, op_BL_S = 31 23 }; 24 25 enum flow { 26 noflow, 27 direct_jump, 28 direct_call, 29 indirect_jump, 30 indirect_call, 31 invalid_instr 32 }; 33 34 #define IS_BIT(word, n) ((word) & (1<<n)) 35 #define BITS(word, s, e) (((word) >> (s)) & (~((-2) << ((e) - (s))))) 36 37 #define MAJOR_OPCODE(word) (BITS((word), 27, 31)) 38 #define MINOR_OPCODE(word) (BITS((word), 16, 21)) 39 #define FIELD_A(word) (BITS((word), 0, 5)) 40 #define FIELD_B(word) ((BITS((word), 12, 14)<<3) | \ 41 (BITS((word), 24, 26))) 42 #define FIELD_C(word) (BITS((word), 6, 11)) 43 #define FIELD_u6(word) FIELDC(word) 44 #define FIELD_s12(word) sign_extend(((BITS((word), 0, 5) << 6) | \ 45 BITS((word), 6, 11)), 12) 46 47 /* note that for BL/BRcc these two macro's need another AND statement to mask 48 * out bit 1 (make the result a multiple of 4) */ 49 #define FIELD_s9(word) sign_extend(((BITS(word, 15, 15) << 8) | \ 50 BITS(word, 16, 23)), 9) 51 #define FIELD_s21(word) sign_extend(((BITS(word, 6, 15) << 11) | \ 52 (BITS(word, 17, 26) << 1)), 12) 53 #define FIELD_s25(word) sign_extend(((BITS(word, 0, 3) << 21) | \ 54 (BITS(word, 6, 15) << 11) | \ 55 (BITS(word, 17, 26) << 1)), 12) 56 57 /* note: these operate on 16 bits! */ 58 #define FIELD_S_A(word) ((BITS((word), 2, 2)<<3) | BITS((word), 0, 2)) 59 #define FIELD_S_B(word) ((BITS((word), 10, 10)<<3) | \ 60 BITS((word), 8, 10)) 61 #define FIELD_S_C(word) ((BITS((word), 7, 7)<<3) | BITS((word), 5, 7)) 62 #define FIELD_S_H(word) ((BITS((word), 0, 2)<<3) | BITS((word), 5, 8)) 63 #define FIELD_S_u5(word) (BITS((word), 0, 4)) 64 #define FIELD_S_u6(word) (BITS((word), 0, 4) << 1) 65 #define FIELD_S_u7(word) (BITS((word), 0, 4) << 2) 66 #define FIELD_S_u10(word) (BITS((word), 0, 7) << 2) 67 #define FIELD_S_s7(word) sign_extend(BITS((word), 0, 5) << 1, 9) 68 #define FIELD_S_s8(word) sign_extend(BITS((word), 0, 7) << 1, 9) 69 #define FIELD_S_s9(word) sign_extend(BITS((word), 0, 8), 9) 70 #define FIELD_S_s10(word) sign_extend(BITS((word), 0, 8) << 1, 10) 71 #define FIELD_S_s11(word) sign_extend(BITS((word), 0, 8) << 2, 11) 72 #define FIELD_S_s13(word) sign_extend(BITS((word), 0, 10) << 2, 13) 73 74 #define STATUS32_L 0x00000100 75 #define REG_LIMM 62 76 77 struct disasm_state { 78 /* generic info */ 79 unsigned long words[2]; 80 int instr_len; 81 int major_opcode; 82 /* info for branch/jump */ 83 int is_branch; 84 int target; 85 int delay_slot; 86 enum flow flow; 87 /* info for load/store */ 88 int src1, src2, src3, dest, wb_reg; 89 int zz, aa, x, pref, di; 90 int fault, write; 91 }; 92 93 static inline int sign_extend(int value, int bits) 94 { 95 if (IS_BIT(value, (bits - 1))) 96 value |= (0xffffffff << bits); 97 98 return value; 99 } 100 101 static inline int is_short_instr(unsigned long addr) 102 { 103 uint16_t word = *((uint16_t *)addr); 104 int opcode = (word >> 11) & 0x1F; 105 return (opcode >= 0x0B); 106 } 107 108 void disasm_instr(unsigned long addr, struct disasm_state *state, 109 int userspace, struct pt_regs *regs, struct callee_regs *cregs); 110 int disasm_next_pc(unsigned long pc, struct pt_regs *regs, struct callee_regs 111 *cregs, unsigned long *fall_thru, unsigned long *target); 112 long get_reg(int reg, struct pt_regs *regs, struct callee_regs *cregs); 113 void set_reg(int reg, long val, struct pt_regs *regs, 114 struct callee_regs *cregs); 115 116 #endif /* __ARC_DISASM_H__ */ 117