bdc1e47217
The arch specific implementation behaves like user_enable_single_step() except that it does not disable single stepping if it was already enabled by ptrace. This allows the debugger to single step over an uprobe. The state of block stepping is not restored. It makes only sense together with TF and if that was enabled then the debugger is notified. Note: this is still not correct. For example, TIF_SINGLESTEP check is not right, the application itself can set X86_EFLAGS_TF. And otoh we leak TIF_SINGLESTEP (set by enable) if the probed insn is "popf". See the next patches, we need the changes in arch/x86/kernel/step.c first. Signed-off-by: Sebastian Andrzej Siewior <bigeasy@linutronix.de> Signed-off-by: Oleg Nesterov <oleg@redhat.com> Acked-by: Srikar Dronamraju <srikar@linux.vnet.ibm.com>
60 lines
2.0 KiB
C
60 lines
2.0 KiB
C
#ifndef _ASM_UPROBES_H
|
|
#define _ASM_UPROBES_H
|
|
/*
|
|
* User-space Probes (UProbes) for x86
|
|
*
|
|
* 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 (C) IBM Corporation, 2008-2011
|
|
* Authors:
|
|
* Srikar Dronamraju
|
|
* Jim Keniston
|
|
*/
|
|
|
|
#include <linux/notifier.h>
|
|
|
|
typedef u8 uprobe_opcode_t;
|
|
|
|
#define MAX_UINSN_BYTES 16
|
|
#define UPROBE_XOL_SLOT_BYTES 128 /* to keep it cache aligned */
|
|
|
|
#define UPROBE_SWBP_INSN 0xcc
|
|
#define UPROBE_SWBP_INSN_SIZE 1
|
|
|
|
struct arch_uprobe {
|
|
u16 fixups;
|
|
u8 insn[MAX_UINSN_BYTES];
|
|
#ifdef CONFIG_X86_64
|
|
unsigned long rip_rela_target_address;
|
|
#endif
|
|
};
|
|
|
|
struct arch_uprobe_task {
|
|
unsigned long saved_trap_nr;
|
|
#ifdef CONFIG_X86_64
|
|
unsigned long saved_scratch_register;
|
|
#endif
|
|
#define UPROBE_CLEAR_TF (1 << 0)
|
|
unsigned int restore_flags;
|
|
};
|
|
|
|
extern int arch_uprobe_analyze_insn(struct arch_uprobe *aup, struct mm_struct *mm, unsigned long addr);
|
|
extern int arch_uprobe_pre_xol(struct arch_uprobe *aup, struct pt_regs *regs);
|
|
extern int arch_uprobe_post_xol(struct arch_uprobe *aup, struct pt_regs *regs);
|
|
extern bool arch_uprobe_xol_was_trapped(struct task_struct *tsk);
|
|
extern int arch_uprobe_exception_notify(struct notifier_block *self, unsigned long val, void *data);
|
|
extern void arch_uprobe_abort_xol(struct arch_uprobe *aup, struct pt_regs *regs);
|
|
#endif /* _ASM_UPROBES_H */
|