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8209003547
Added kprobes to ppc32 platforms that have use single_step_exception. This excludes 4xx and anything Book-E since their debug mechanisms for single stepping are completely different. Signed-off-by: Kumar Gala <galak@kernel.crashing.org>
28 lines
1.1 KiB
C
28 lines
1.1 KiB
C
/*
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* Copyright (C) 2004 Paul Mackerras <paulus@au.ibm.com>, IBM
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version
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* 2 of the License, or (at your option) any later version.
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*/
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struct pt_regs;
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/*
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* We don't allow single-stepping an mtmsrd that would clear
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* MSR_RI, since that would make the exception unrecoverable.
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* Since we need to single-step to proceed from a breakpoint,
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* we don't allow putting a breakpoint on an mtmsrd instruction.
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* Similarly we don't allow breakpoints on rfid instructions.
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* These macros tell us if an instruction is a mtmsrd or rfid.
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* Note that IS_MTMSRD returns true for both an mtmsr (32-bit)
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* and an mtmsrd (64-bit).
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*/
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#define IS_MTMSRD(instr) (((instr) & 0xfc0007be) == 0x7c000124)
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#define IS_RFID(instr) (((instr) & 0xfc0007fe) == 0x4c000024)
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#define IS_RFI(instr) (((instr) & 0xfc0007fe) == 0x4c000064)
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/* Emulate instructions that cause a transfer of control. */
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extern int emulate_step(struct pt_regs *regs, unsigned int instr);
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