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35fd219a26
This patch moves the single step enable code used by kprobe to a generic routine header so that, it can be re-used by other code, in this case, uprobes. No functional changes. Signed-off-by: Suzuki K. Poulose <suzuki@in.ibm.com> Cc: Ananth N Mavinakaynahalli <ananth@in.ibm.com> Cc: Kumar Gala <galak@kernel.crashing.org> Cc: linuxppc-dev@ozlabs.org Acked-by: Ananth N Mavinakayanahalli <ananth@in.ibm.com> Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
68 lines
2.1 KiB
C
68 lines
2.1 KiB
C
#ifndef _ASM_POWERPC_PROBES_H
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#define _ASM_POWERPC_PROBES_H
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#ifdef __KERNEL__
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/*
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* Definitions common to probes files
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
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*
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* Copyright IBM Corporation, 2012
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*/
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#include <linux/types.h>
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typedef u32 ppc_opcode_t;
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#define BREAKPOINT_INSTRUCTION 0x7fe00008 /* trap */
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/* Trap definitions per ISA */
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#define IS_TW(instr) (((instr) & 0xfc0007fe) == 0x7c000008)
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#define IS_TD(instr) (((instr) & 0xfc0007fe) == 0x7c000088)
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#define IS_TDI(instr) (((instr) & 0xfc000000) == 0x08000000)
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#define IS_TWI(instr) (((instr) & 0xfc000000) == 0x0c000000)
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#ifdef CONFIG_PPC64
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#define is_trap(instr) (IS_TW(instr) || IS_TD(instr) || \
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IS_TWI(instr) || IS_TDI(instr))
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#else
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#define is_trap(instr) (IS_TW(instr) || IS_TWI(instr))
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#endif /* CONFIG_PPC64 */
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#ifdef CONFIG_PPC_ADV_DEBUG_REGS
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#define MSR_SINGLESTEP (MSR_DE)
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#else
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#define MSR_SINGLESTEP (MSR_SE)
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#endif
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/* Enable single stepping for the current task */
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static inline void enable_single_step(struct pt_regs *regs)
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{
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regs->msr |= MSR_SINGLESTEP;
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#ifdef CONFIG_PPC_ADV_DEBUG_REGS
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/*
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* We turn off Critical Input Exception(CE) to ensure that the single
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* step will be for the instruction we have the probe on; if we don't,
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* it is possible we'd get the single step reported for CE.
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*/
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regs->msr &= ~MSR_CE;
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mtspr(SPRN_DBCR0, mfspr(SPRN_DBCR0) | DBCR0_IC | DBCR0_IDM);
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#ifdef CONFIG_PPC_47x
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isync();
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#endif
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#endif
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}
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#endif /* __KERNEL__ */
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#endif /* _ASM_POWERPC_PROBES_H */
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