/* * Copyright (C) 2004 Paul Mackerras <paulus@au.ibm.com>, IBM * * This program is free software; you can redistribute it and/or * modify it under the terms of the GNU General Public License * as published by the Free Software Foundation; either version * 2 of the License, or (at your option) any later version. */ struct pt_regs; /* * We don't allow single-stepping an mtmsrd that would clear * MSR_RI, since that would make the exception unrecoverable. * Since we need to single-step to proceed from a breakpoint, * we don't allow putting a breakpoint on an mtmsrd instruction. * Similarly we don't allow breakpoints on rfid instructions. * These macros tell us if an instruction is a mtmsrd or rfid. * Note that IS_MTMSRD returns true for both an mtmsr (32-bit) * and an mtmsrd (64-bit). */ #define IS_MTMSRD(instr) (((instr) & 0xfc0007be) == 0x7c000124) #define IS_RFID(instr) (((instr) & 0xfc0007fe) == 0x4c000024) /* Emulate instructions that cause a transfer of control. */ extern int emulate_step(struct pt_regs *regs, unsigned int instr);