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Linux/arch/arc/include/asm/disasm.h

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  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 

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