1 /* SPDX-License-Identifier: GPL-2.0-only */ 1
2 /*
3 * several functions that help interpret ARC i
4 * used for unaligned accesses, kprobes and kg
5 *
6 * Copyright (C) 2004, 2007-2010, 2011-2012 Sy
7 */
8
9 #ifndef __ARC_DISASM_H__
10 #define __ARC_DISASM_H__
11
12 enum {
13 op_Bcc = 0, op_BLcc = 1, op_LD = 2, op
14 op_MAJOR_5 = 5, op_LD_ADD = 12, op_ADD
15 op_ADD_MOV_CMP = 14, op_S = 15, op_LD_
16 op_LDW_S = 18, op_LDWX_S = 19, op_ST_S
17 op_STW_S = 22, op_Su5 = 23, op_SP = 24
18 op_Pcl = 26, op_MOV_S = 27, op_ADD_CMP
19 op_B_S = 30, op_BL_S = 31
20 };
21
22 enum 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<<
32 #define BITS(word, s, e) (((word) >> (s
33
34 #define MAJOR_OPCODE(word) (BITS((word),
35 #define MINOR_OPCODE(word) (BITS((word),
36 #define FIELD_A(word) (BITS((word),
37 #define FIELD_B(word) ((BITS((word),
38 (BITS((word),
39 #define FIELD_C(word) (BITS((word),
40 #define FIELD_u6(word) FIELDC(word)
41 #define FIELD_s12(word) sign_extend(((
42 BITS((
43
44 /* note that for BL/BRcc these two macro's nee
45 * out bit 1 (make the result a multiple of 4)
46 #define FIELD_s9(word) sign_extend(((
47 BITS(w
48 #define FIELD_s21(word) sign_extend(((
49 (BITS(
50 #define FIELD_s25(word) sign_extend(((
51 (BITS(
52 (BITS(
53
54 /* note: these operate on 16 bits! */
55 #define FIELD_S_A(word) ((BITS((word),
56 #define FIELD_S_B(word) ((BITS((word),
57 BITS((word), 8
58 #define FIELD_S_C(word) ((BITS((word),
59 #define FIELD_S_H(word) ((BITS((word),
60 #define FIELD_S_u5(word) (BITS((word),
61 #define FIELD_S_u6(word) (BITS((word),
62 #define FIELD_S_u7(word) (BITS((word),
63 #define FIELD_S_u10(word) (BITS((word),
64 #define FIELD_S_s7(word) sign_extend(BI
65 #define FIELD_S_s8(word) sign_extend(BI
66 #define FIELD_S_s9(word) sign_extend(BI
67 #define FIELD_S_s10(word) sign_extend(BI
68 #define FIELD_S_s11(word) sign_extend(BI
69 #define FIELD_S_s13(word) sign_extend(BI
70
71 #define STATUS32_L 0x00000100
72 #define REG_LIMM 62
73
74 struct 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
90 static inline int sign_extend(int value, int b
91 {
92 if (IS_BIT(value, (bits - 1)))
93 value |= (0xffffffff << bits);
94
95 return value;
96 }
97
98 static inline int is_short_instr(unsigned long
99 {
100 uint16_t word = *((uint16_t *)addr);
101 int opcode = (word >> 11) & 0x1F;
102 return (opcode >= 0x0B);
103 }
104
105 void disasm_instr(unsigned long addr, struct d
106 int userspace, struct pt_regs *regs, s
107 int disasm_next_pc(unsigned long pc, struct pt
108 *cregs, unsigned long *fall_thru, unsi
109 long get_reg(int reg, struct pt_regs *regs, st
110 void set_reg(int reg, long val, struct pt_regs
111 struct callee_regs *cregs);
112
113 #endif /* __ARC_DISASM_H__ */
114
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