1 /*
2  * Copyright (C) 2004 Paul Mackerras <paulus@au.ibm.com>, IBM
3  *
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.
8  */
9 
10 struct pt_regs;
11 
12 /*
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).
21  */
22 #define IS_MTMSRD(instr)	(((instr) & 0xfc0007be) == 0x7c000124)
23 #define IS_RFID(instr)		(((instr) & 0xfc0007fe) == 0x4c000024)
24 #define IS_RFI(instr)		(((instr) & 0xfc0007fe) == 0x4c000064)
25 
26 /* Emulate instructions that cause a transfer of control. */
27 extern int emulate_step(struct pt_regs *regs, unsigned int instr);
28