1*b8b572e1SStephen Rothwell /* 2*b8b572e1SStephen Rothwell * Copyright (C) 2004 Paul Mackerras <paulus@au.ibm.com>, IBM 3*b8b572e1SStephen Rothwell * 4*b8b572e1SStephen Rothwell * This program is free software; you can redistribute it and/or 5*b8b572e1SStephen Rothwell * modify it under the terms of the GNU General Public License 6*b8b572e1SStephen Rothwell * as published by the Free Software Foundation; either version 7*b8b572e1SStephen Rothwell * 2 of the License, or (at your option) any later version. 8*b8b572e1SStephen Rothwell */ 9*b8b572e1SStephen Rothwell 10*b8b572e1SStephen Rothwell struct pt_regs; 11*b8b572e1SStephen Rothwell 12*b8b572e1SStephen Rothwell /* 13*b8b572e1SStephen Rothwell * We don't allow single-stepping an mtmsrd that would clear 14*b8b572e1SStephen Rothwell * MSR_RI, since that would make the exception unrecoverable. 15*b8b572e1SStephen Rothwell * Since we need to single-step to proceed from a breakpoint, 16*b8b572e1SStephen Rothwell * we don't allow putting a breakpoint on an mtmsrd instruction. 17*b8b572e1SStephen Rothwell * Similarly we don't allow breakpoints on rfid instructions. 18*b8b572e1SStephen Rothwell * These macros tell us if an instruction is a mtmsrd or rfid. 19*b8b572e1SStephen Rothwell * Note that IS_MTMSRD returns true for both an mtmsr (32-bit) 20*b8b572e1SStephen Rothwell * and an mtmsrd (64-bit). 21*b8b572e1SStephen Rothwell */ 22*b8b572e1SStephen Rothwell #define IS_MTMSRD(instr) (((instr) & 0xfc0007be) == 0x7c000124) 23*b8b572e1SStephen Rothwell #define IS_RFID(instr) (((instr) & 0xfc0007fe) == 0x4c000024) 24*b8b572e1SStephen Rothwell #define IS_RFI(instr) (((instr) & 0xfc0007fe) == 0x4c000064) 25*b8b572e1SStephen Rothwell 26*b8b572e1SStephen Rothwell /* Emulate instructions that cause a transfer of control. */ 27*b8b572e1SStephen Rothwell extern int emulate_step(struct pt_regs *regs, unsigned int instr); 28