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Linus Torvalds1da177e2005-04-16 15:20:36 -07001/*
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
10struct 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.
Paul Mackerrasc0325242005-10-28 22:48:08 +100019 * Note that IS_MTMSRD returns true for both an mtmsr (32-bit)
20 * and an mtmsrd (64-bit).
Linus Torvalds1da177e2005-04-16 15:20:36 -070021 */
Paul Mackerrasc0325242005-10-28 22:48:08 +100022#define IS_MTMSRD(instr) (((instr) & 0xfc0007be) == 0x7c000124)
Linus Torvalds1da177e2005-04-16 15:20:36 -070023#define IS_RFID(instr) (((instr) & 0xfc0007fe) == 0x4c000024)
Kumar Gala82090032007-02-06 22:55:19 -060024#define IS_RFI(instr) (((instr) & 0xfc0007fe) == 0x4c000064)
Linus Torvalds1da177e2005-04-16 15:20:36 -070025
26/* Emulate instructions that cause a transfer of control. */
27extern int emulate_step(struct pt_regs *regs, unsigned int instr);