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- /*
- * 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)
- #define IS_RFI(instr) (((instr) & 0xfc0007fe) == 0x4c000064)
- /* Emulate instructions that cause a transfer of control. */
- extern int emulate_step(struct pt_regs *regs, unsigned int instr);
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