disasm.h (3813B)
1/* SPDX-License-Identifier: GPL-2.0-only */ 2/* 3 * several functions that help interpret ARC instructions 4 * used for unaligned accesses, kprobes and kgdb 5 * 6 * Copyright (C) 2004, 2007-2010, 2011-2012 Synopsys, Inc. (www.synopsys.com) 7 */ 8 9#ifndef __ARC_DISASM_H__ 10#define __ARC_DISASM_H__ 11 12enum { 13 op_Bcc = 0, op_BLcc = 1, op_LD = 2, op_ST = 3, op_MAJOR_4 = 4, 14 op_MAJOR_5 = 5, op_LD_ADD = 12, op_ADD_SUB_SHIFT = 13, 15 op_ADD_MOV_CMP = 14, op_S = 15, op_LD_S = 16, op_LDB_S = 17, 16 op_LDW_S = 18, op_LDWX_S = 19, op_ST_S = 20, op_STB_S = 21, 17 op_STW_S = 22, op_Su5 = 23, op_SP = 24, op_GP = 25, 18 op_Pcl = 26, op_MOV_S = 27, op_ADD_CMP = 28, op_BR_S = 29, 19 op_B_S = 30, op_BL_S = 31 20}; 21 22enum flow { 23 noflow, 24 direct_jump, 25 direct_call, 26 indirect_jump, 27 indirect_call, 28 invalid_instr 29}; 30 31#define IS_BIT(word, n) ((word) & (1<<n)) 32#define BITS(word, s, e) (((word) >> (s)) & (~((-2) << ((e) - (s))))) 33 34#define MAJOR_OPCODE(word) (BITS((word), 27, 31)) 35#define MINOR_OPCODE(word) (BITS((word), 16, 21)) 36#define FIELD_A(word) (BITS((word), 0, 5)) 37#define FIELD_B(word) ((BITS((word), 12, 14)<<3) | \ 38 (BITS((word), 24, 26))) 39#define FIELD_C(word) (BITS((word), 6, 11)) 40#define FIELD_u6(word) FIELDC(word) 41#define FIELD_s12(word) sign_extend(((BITS((word), 0, 5) << 6) | \ 42 BITS((word), 6, 11)), 12) 43 44/* note that for BL/BRcc these two macro's need another AND statement to mask 45 * out bit 1 (make the result a multiple of 4) */ 46#define FIELD_s9(word) sign_extend(((BITS(word, 15, 15) << 8) | \ 47 BITS(word, 16, 23)), 9) 48#define FIELD_s21(word) sign_extend(((BITS(word, 6, 15) << 11) | \ 49 (BITS(word, 17, 26) << 1)), 12) 50#define FIELD_s25(word) sign_extend(((BITS(word, 0, 3) << 21) | \ 51 (BITS(word, 6, 15) << 11) | \ 52 (BITS(word, 17, 26) << 1)), 12) 53 54/* note: these operate on 16 bits! */ 55#define FIELD_S_A(word) ((BITS((word), 2, 2)<<3) | BITS((word), 0, 2)) 56#define FIELD_S_B(word) ((BITS((word), 10, 10)<<3) | \ 57 BITS((word), 8, 10)) 58#define FIELD_S_C(word) ((BITS((word), 7, 7)<<3) | BITS((word), 5, 7)) 59#define FIELD_S_H(word) ((BITS((word), 0, 2)<<3) | BITS((word), 5, 8)) 60#define FIELD_S_u5(word) (BITS((word), 0, 4)) 61#define FIELD_S_u6(word) (BITS((word), 0, 4) << 1) 62#define FIELD_S_u7(word) (BITS((word), 0, 4) << 2) 63#define FIELD_S_u10(word) (BITS((word), 0, 7) << 2) 64#define FIELD_S_s7(word) sign_extend(BITS((word), 0, 5) << 1, 9) 65#define FIELD_S_s8(word) sign_extend(BITS((word), 0, 7) << 1, 9) 66#define FIELD_S_s9(word) sign_extend(BITS((word), 0, 8), 9) 67#define FIELD_S_s10(word) sign_extend(BITS((word), 0, 8) << 1, 10) 68#define FIELD_S_s11(word) sign_extend(BITS((word), 0, 8) << 2, 11) 69#define FIELD_S_s13(word) sign_extend(BITS((word), 0, 10) << 2, 13) 70 71#define STATUS32_L 0x00000100 72#define REG_LIMM 62 73 74struct disasm_state { 75 /* generic info */ 76 unsigned long words[2]; 77 int instr_len; 78 int major_opcode; 79 /* info for branch/jump */ 80 int is_branch; 81 int target; 82 int delay_slot; 83 enum flow flow; 84 /* info for load/store */ 85 int src1, src2, src3, dest, wb_reg; 86 int zz, aa, x, pref, di; 87 int fault, write; 88}; 89 90static inline int sign_extend(int value, int bits) 91{ 92 if (IS_BIT(value, (bits - 1))) 93 value |= (0xffffffff << bits); 94 95 return value; 96} 97 98static inline int is_short_instr(unsigned long addr) 99{ 100 uint16_t word = *((uint16_t *)addr); 101 int opcode = (word >> 11) & 0x1F; 102 return (opcode >= 0x0B); 103} 104 105void disasm_instr(unsigned long addr, struct disasm_state *state, 106 int userspace, struct pt_regs *regs, struct callee_regs *cregs); 107int disasm_next_pc(unsigned long pc, struct pt_regs *regs, struct callee_regs 108 *cregs, unsigned long *fall_thru, unsigned long *target); 109long get_reg(int reg, struct pt_regs *regs, struct callee_regs *cregs); 110void set_reg(int reg, long val, struct pt_regs *regs, 111 struct callee_regs *cregs); 112 113#endif /* __ARC_DISASM_H__ */