2 * Copyright (C) 2004 Paul Mackerras <paulus@au.ibm.com>, IBM
4 * This program is free software; you can redistribute it and/or
5 * modify it under the terms of the GNU General Public License
6 * as published by the Free Software Foundation; either version
7 * 2 of the License, or (at your option) any later version.
13 * We don't allow single-stepping an mtmsrd that would clear
14 * MSR_RI, since that would make the exception unrecoverable.
15 * Since we need to single-step to proceed from a breakpoint,
16 * we don't allow putting a breakpoint on an mtmsrd instruction.
17 * Similarly we don't allow breakpoints on rfid instructions.
18 * These macros tell us if an instruction is a mtmsrd or rfid.
19 * Note that IS_MTMSRD returns true for both an mtmsr (32-bit)
20 * and an mtmsrd (64-bit).
22 #define IS_MTMSRD(instr) (((instr) & 0xfc0007be) == 0x7c000124)
23 #define IS_RFID(instr) (((instr) & 0xfc0007fe) == 0x4c000024)
24 #define IS_RFI(instr) (((instr) & 0xfc0007fe) == 0x4c000064)
26 /* Emulate instructions that cause a transfer of control. */
27 extern int emulate_step(struct pt_regs *regs, unsigned int instr);
29 enum instruction_type {
30 COMPUTE, /* arith/logical/CR op, etc. */
56 #define INSTR_TYPE_MASK 0x1f
58 /* Load/store flags, ORed in with type */
60 #define UPDATE 0x40 /* matches bit in opcode 31 instructions */
63 /* Cacheop values, ORed in with type */
64 #define CACHEOP_MASK 0x700
71 /* Size field in type word */
72 #define SIZE(n) ((n) << 8)
73 #define GETSIZE(w) ((w) >> 8)
75 #define MKOP(t, f, s) ((t) | (f) | SIZE(s))
77 struct instruction_op {
81 /* For LOAD/STORE/LARX/STCX */
88 extern int analyse_instr(struct instruction_op *op, struct pt_regs *regs,