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Diffstat (limited to 'kernel/arch/arc/include/asm/disasm.h')
| -rw-r--r-- | kernel/arch/arc/include/asm/disasm.h | 116 |
1 files changed, 116 insertions, 0 deletions
diff --git a/kernel/arch/arc/include/asm/disasm.h b/kernel/arch/arc/include/asm/disasm.h new file mode 100644 index 000000000..f1cce3d05 --- /dev/null +++ b/kernel/arch/arc/include/asm/disasm.h @@ -0,0 +1,116 @@ +/* + * 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__ */ |