f438d914b2
Introduce architecture dependent kretprobe blacklists to prohibit users from inserting return probes on the function in which kprobes can be inserted but kretprobes can not. This patch also removes "__kprobes" mark from "__switch_to" on x86_64 and registers "__switch_to" to the blacklist on x86-64, because that mark is to prohibit user from inserting only kretprobe. Signed-off-by: Masami Hiramatsu <mhiramat@redhat.com> Cc: Prasanna S Panchamukhi <prasanna@in.ibm.com> Acked-by: Ananth N Mavinakayanahalli <ananth@in.ibm.com> Cc: Anil S Keshavamurthy <anil.s.keshavamurthy@intel.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
119 lines
3.7 KiB
C
119 lines
3.7 KiB
C
#ifndef _ASM_POWERPC_KPROBES_H
|
|
#define _ASM_POWERPC_KPROBES_H
|
|
#ifdef __KERNEL__
|
|
/*
|
|
* Kernel Probes (KProbes)
|
|
*
|
|
* 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, 2002, 2004
|
|
*
|
|
* 2002-Oct Created by Vamsi Krishna S <vamsi_krishna@in.ibm.com> Kernel
|
|
* Probes initial implementation ( includes suggestions from
|
|
* Rusty Russell).
|
|
* 2004-Nov Modified for PPC64 by Ananth N Mavinakayanahalli
|
|
* <ananth@in.ibm.com>
|
|
*/
|
|
#include <linux/types.h>
|
|
#include <linux/ptrace.h>
|
|
#include <linux/percpu.h>
|
|
|
|
#define __ARCH_WANT_KPROBES_INSN_SLOT
|
|
|
|
struct pt_regs;
|
|
struct kprobe;
|
|
|
|
typedef unsigned int kprobe_opcode_t;
|
|
#define BREAKPOINT_INSTRUCTION 0x7fe00008 /* trap */
|
|
#define MAX_INSN_SIZE 1
|
|
|
|
#define IS_TW(instr) (((instr) & 0xfc0007fe) == 0x7c000008)
|
|
#define IS_TD(instr) (((instr) & 0xfc0007fe) == 0x7c000088)
|
|
#define IS_TDI(instr) (((instr) & 0xfc000000) == 0x08000000)
|
|
#define IS_TWI(instr) (((instr) & 0xfc000000) == 0x0c000000)
|
|
|
|
#ifdef CONFIG_PPC64
|
|
/*
|
|
* 64bit powerpc uses function descriptors.
|
|
* Handle cases where:
|
|
* - User passes a <.symbol> or <module:.symbol>
|
|
* - User passes a <symbol> or <module:symbol>
|
|
* - User passes a non-existant symbol, kallsyms_lookup_name
|
|
* returns 0. Don't deref the NULL pointer in that case
|
|
*/
|
|
#define kprobe_lookup_name(name, addr) \
|
|
{ \
|
|
addr = (kprobe_opcode_t *)kallsyms_lookup_name(name); \
|
|
if (addr) { \
|
|
char *colon; \
|
|
if ((colon = strchr(name, ':')) != NULL) { \
|
|
colon++; \
|
|
if (*colon != '\0' && *colon != '.') \
|
|
addr = *(kprobe_opcode_t **)addr; \
|
|
} else if (name[0] != '.') \
|
|
addr = *(kprobe_opcode_t **)addr; \
|
|
} else { \
|
|
char dot_name[KSYM_NAME_LEN]; \
|
|
dot_name[0] = '.'; \
|
|
dot_name[1] = '\0'; \
|
|
strncat(dot_name, name, KSYM_NAME_LEN - 2); \
|
|
addr = (kprobe_opcode_t *)kallsyms_lookup_name(dot_name); \
|
|
} \
|
|
}
|
|
|
|
#define is_trap(instr) (IS_TW(instr) || IS_TD(instr) || \
|
|
IS_TWI(instr) || IS_TDI(instr))
|
|
#else
|
|
/* Use stock kprobe_lookup_name since ppc32 doesn't use function descriptors */
|
|
#define is_trap(instr) (IS_TW(instr) || IS_TWI(instr))
|
|
#endif
|
|
|
|
#define ARCH_SUPPORTS_KRETPROBES
|
|
#define flush_insn_slot(p) do { } while (0)
|
|
#define kretprobe_blacklist_size 0
|
|
|
|
void kretprobe_trampoline(void);
|
|
extern void arch_remove_kprobe(struct kprobe *p);
|
|
|
|
/* Architecture specific copy of original instruction */
|
|
struct arch_specific_insn {
|
|
/* copy of original instruction */
|
|
kprobe_opcode_t *insn;
|
|
/*
|
|
* Set in kprobes code, initially to 0. If the instruction can be
|
|
* eumulated, this is set to 1, if not, to -1.
|
|
*/
|
|
int boostable;
|
|
};
|
|
|
|
struct prev_kprobe {
|
|
struct kprobe *kp;
|
|
unsigned long status;
|
|
unsigned long saved_msr;
|
|
};
|
|
|
|
/* per-cpu kprobe control block */
|
|
struct kprobe_ctlblk {
|
|
unsigned long kprobe_status;
|
|
unsigned long kprobe_saved_msr;
|
|
struct pt_regs jprobe_saved_regs;
|
|
struct prev_kprobe prev_kprobe;
|
|
};
|
|
|
|
extern int kprobe_exceptions_notify(struct notifier_block *self,
|
|
unsigned long val, void *data);
|
|
extern int kprobe_fault_handler(struct pt_regs *regs, int trapnr);
|
|
#endif /* __KERNEL__ */
|
|
#endif /* _ASM_POWERPC_KPROBES_H */
|