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1da177e4 LT |
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. | |
c032524f PM |
19 | * Note that IS_MTMSRD returns true for both an mtmsr (32-bit) |
20 | * and an mtmsrd (64-bit). | |
1da177e4 | 21 | */ |
c032524f | 22 | #define IS_MTMSRD(instr) (((instr) & 0xfc0007be) == 0x7c000124) |
1da177e4 | 23 | #define IS_RFID(instr) (((instr) & 0xfc0007fe) == 0x4c000024) |
82090035 | 24 | #define IS_RFI(instr) (((instr) & 0xfc0007fe) == 0x4c000064) |
1da177e4 LT |
25 | |
26 | /* Emulate instructions that cause a transfer of control. */ | |
27 | extern int emulate_step(struct pt_regs *regs, unsigned int instr); |