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ARC: disassembly (needed by kprobes/kgdb/unaligned-access-emul)

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In-kernel disassembler

Due Credits
* Orig written by Rajeshwar Ranga
* Consolidation/cleanups by Mischa Jonker

Signed-off-by: Vineet Gupta <vgupta@synopsys.com>
Cc: Rajeshwar Ranga <rajeshwar.ranga@gmail.com>
Cc: Mischa Jonker <mjonker@synopsys.com>
This commit is contained in:
Vineet Gupta
2013-01-30 17:46:13 +05:30
parent 44c8bb9140
commit e65ab5a875
3 changed files with 656 additions and 1 deletions
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116
arch/arc/include/asm/disasm.h Normal file
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/*
* several functions that help interpret ARC instructions
* used for unaligned accesses, kprobes and kgdb
*
* Copyright (C) 2004, 2007-2010, 2011-2012 Synopsys, Inc. (www.synopsys.com)
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2 as
* published by the Free Software Foundation.
*/
#ifndef __ARC_DISASM_H__
#define __ARC_DISASM_H__
enum {
op_Bcc = 0, op_BLcc = 1, op_LD = 2, op_ST = 3, op_MAJOR_4 = 4,
op_MAJOR_5 = 5, op_LD_ADD = 12, op_ADD_SUB_SHIFT = 13,
op_ADD_MOV_CMP = 14, op_S = 15, op_LD_S = 16, op_LDB_S = 17,
op_LDW_S = 18, op_LDWX_S = 19, op_ST_S = 20, op_STB_S = 21,
op_STW_S = 22, op_Su5 = 23, op_SP = 24, op_GP = 25,
op_Pcl = 26, op_MOV_S = 27, op_ADD_CMP = 28, op_BR_S = 29,
op_B_S = 30, op_BL_S = 31
};
enum flow {
noflow,
direct_jump,
direct_call,
indirect_jump,
indirect_call,
invalid_instr
};
#define IS_BIT(word, n) ((word) & (1<<n))
#define BITS(word, s, e) (((word) >> (s)) & (~((-2) << ((e) - (s)))))
#define MAJOR_OPCODE(word) (BITS((word), 27, 31))
#define MINOR_OPCODE(word) (BITS((word), 16, 21))
#define FIELD_A(word) (BITS((word), 0, 5))
#define FIELD_B(word) ((BITS((word), 12, 14)<<3) | \
(BITS((word), 24, 26)))
#define FIELD_C(word) (BITS((word), 6, 11))
#define FIELD_u6(word) FIELDC(word)
#define FIELD_s12(word) sign_extend(((BITS((word), 0, 5) << 6) | \
BITS((word), 6, 11)), 12)
/* note that for BL/BRcc these two macro's need another AND statement to mask
* out bit 1 (make the result a multiple of 4) */
#define FIELD_s9(word) sign_extend(((BITS(word, 15, 15) << 8) | \
BITS(word, 16, 23)), 9)
#define FIELD_s21(word) sign_extend(((BITS(word, 6, 15) << 11) | \
(BITS(word, 17, 26) << 1)), 12)
#define FIELD_s25(word) sign_extend(((BITS(word, 0, 3) << 21) | \
(BITS(word, 6, 15) << 11) | \
(BITS(word, 17, 26) << 1)), 12)
/* note: these operate on 16 bits! */
#define FIELD_S_A(word) ((BITS((word), 2, 2)<<3) | BITS((word), 0, 2))
#define FIELD_S_B(word) ((BITS((word), 10, 10)<<3) | \
BITS((word), 8, 10))
#define FIELD_S_C(word) ((BITS((word), 7, 7)<<3) | BITS((word), 5, 7))
#define FIELD_S_H(word) ((BITS((word), 0, 2)<<3) | BITS((word), 5, 8))
#define FIELD_S_u5(word) (BITS((word), 0, 4))
#define FIELD_S_u6(word) (BITS((word), 0, 4) << 1)
#define FIELD_S_u7(word) (BITS((word), 0, 4) << 2)
#define FIELD_S_u10(word) (BITS((word), 0, 7) << 2)
#define FIELD_S_s7(word) sign_extend(BITS((word), 0, 5) << 1, 9)
#define FIELD_S_s8(word) sign_extend(BITS((word), 0, 7) << 1, 9)
#define FIELD_S_s9(word) sign_extend(BITS((word), 0, 8), 9)
#define FIELD_S_s10(word) sign_extend(BITS((word), 0, 8) << 1, 10)
#define FIELD_S_s11(word) sign_extend(BITS((word), 0, 8) << 2, 11)
#define FIELD_S_s13(word) sign_extend(BITS((word), 0, 10) << 2, 13)
#define STATUS32_L 0x00000100
#define REG_LIMM 62
struct disasm_state {
/* generic info */
unsigned long words[2];
int instr_len;
int major_opcode;
/* info for branch/jump */
int is_branch;
int target;
int delay_slot;
enum flow flow;
/* info for load/store */
int src1, src2, src3, dest, wb_reg;
int zz, aa, x, pref, di;
int fault, write;
};
static inline int sign_extend(int value, int bits)
{
if (IS_BIT(value, (bits - 1)))
value |= (0xffffffff << bits);
return value;
}
static inline int is_short_instr(unsigned long addr)
{
uint16_t word = *((uint16_t *)addr);
int opcode = (word >> 11) & 0x1F;
return (opcode >= 0x0B);
}
void disasm_instr(unsigned long addr, struct disasm_state *state,
int userspace, struct pt_regs *regs, struct callee_regs *cregs);
int disasm_next_pc(unsigned long pc, struct pt_regs *regs, struct callee_regs
*cregs, unsigned long *fall_thru, unsigned long *target);
long get_reg(int reg, struct pt_regs *regs, struct callee_regs *cregs);
void set_reg(int reg, long val, struct pt_regs *regs,
struct callee_regs *cregs);
#endif /* __ARC_DISASM_H__ */