cregit-Linux how code gets into the kernel

Release 4.14 arch/powerpc/include/asm/hw_breakpoint.h

/*
 * PowerPC BookIII S hardware breakpoint definitions
 *
 * 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.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
 *
 * Copyright 2010, IBM Corporation.
 * Author: K.Prasad <prasad@linux.vnet.ibm.com>
 *
 */

#ifndef _PPC_BOOK3S_64_HW_BREAKPOINT_H

#define _PPC_BOOK3S_64_HW_BREAKPOINT_H

#ifdef	__KERNEL__

struct arch_hw_breakpoint {
	
unsigned long	address;
	
u16		type;
	
u16		len; /* length of the target data symbol */
};

/* Note: Don't change the the first 6 bits below as they are in the same order
 * as the dabr and dabrx.
 */

#define HW_BRK_TYPE_READ		0x01

#define HW_BRK_TYPE_WRITE		0x02

#define HW_BRK_TYPE_TRANSLATE		0x04

#define HW_BRK_TYPE_USER		0x08

#define HW_BRK_TYPE_KERNEL		0x10

#define HW_BRK_TYPE_HYP			0x20

#define HW_BRK_TYPE_EXTRANEOUS_IRQ	0x80

/* bits that overlap with the bottom 3 bits of the dabr */

#define HW_BRK_TYPE_RDWR	(HW_BRK_TYPE_READ | HW_BRK_TYPE_WRITE)

#define HW_BRK_TYPE_DABR	(HW_BRK_TYPE_RDWR | HW_BRK_TYPE_TRANSLATE)

#define HW_BRK_TYPE_PRIV_ALL	(HW_BRK_TYPE_USER | HW_BRK_TYPE_KERNEL | \
                                 HW_BRK_TYPE_HYP)

#ifdef CONFIG_HAVE_HW_BREAKPOINT
#include <linux/kdebug.h>
#include <asm/reg.h>
#include <asm/debug.h>

struct perf_event;
struct pmu;
struct perf_sample_data;


#define HW_BREAKPOINT_ALIGN 0x7

extern int hw_breakpoint_slots(int type);
extern int arch_bp_generic_fields(int type, int *gen_bp_type);
extern int arch_check_bp_in_kernelspace(struct perf_event *bp);
extern int arch_validate_hwbkpt_settings(struct perf_event *bp);
extern int hw_breakpoint_exceptions_notify(struct notifier_block *unused,
						unsigned long val, void *data);
int arch_install_hw_breakpoint(struct perf_event *bp);
void arch_uninstall_hw_breakpoint(struct perf_event *bp);
void hw_breakpoint_pmu_read(struct perf_event *bp);
extern void flush_ptrace_hw_breakpoint(struct task_struct *tsk);

extern struct pmu perf_ops_bp;
extern void ptrace_triggered(struct perf_event *bp,
			struct perf_sample_data *data, struct pt_regs *regs);

static inline void hw_breakpoint_disable(void) { struct arch_hw_breakpoint brk; brk.address = 0; brk.type = 0; brk.len = 0; __set_breakpoint(&brk); }

Contributors

PersonTokensPropCommitsCommitProp
Michael Neuling2464.86%250.00%
K.Prasad1232.43%125.00%
Paul Gortmaker12.70%125.00%
Total37100.00%4100.00%

extern void thread_change_pc(struct task_struct *tsk, struct pt_regs *regs); #else /* CONFIG_HAVE_HW_BREAKPOINT */
static inline void hw_breakpoint_disable(void) { }

Contributors

PersonTokensPropCommitsCommitProp
K.Prasad8100.00%1100.00%
Total8100.00%1100.00%


static inline void thread_change_pc(struct task_struct *tsk, struct pt_regs *regs) { }

Contributors

PersonTokensPropCommitsCommitProp
K.Prasad16100.00%1100.00%
Total16100.00%1100.00%

#endif /* CONFIG_HAVE_HW_BREAKPOINT */ #endif /* __KERNEL__ */ #endif /* _PPC_BOOK3S_64_HW_BREAKPOINT_H */

Overall Contributors

PersonTokensPropCommitsCommitProp
K.Prasad21571.43%333.33%
Michael Neuling7625.25%333.33%
Paul Mackerras82.66%111.11%
David Howells10.33%111.11%
Paul Gortmaker10.33%111.11%
Total301100.00%9100.00%
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