| Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 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. |
| Paul Mackerras | c032524 | 2005-10-28 22:48:08 +1000 | [diff] [blame] | 19 | * Note that IS_MTMSRD returns true for both an mtmsr (32-bit) |
| 20 | * and an mtmsrd (64-bit). |
| Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 21 | */ |
| Paul Mackerras | c032524 | 2005-10-28 22:48:08 +1000 | [diff] [blame] | 22 | #define IS_MTMSRD(instr) (((instr) & 0xfc0007be) == 0x7c000124) |
| Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 23 | #define IS_RFID(instr) (((instr) & 0xfc0007fe) == 0x4c000024) |
| 24 | |
| 25 | /* Emulate instructions that cause a transfer of control. */ |
| 26 | extern int emulate_step(struct pt_regs *regs, unsigned int instr); |