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