forked from Minki/linux
eb609e52d1
When data symbols are not present in kernel image, user needs to add
dot(".") before function name explicitly, that he wants to probe in kprobe
module on ppc64.
for ex:-
When data symbols are missing on ppc64,
====================
[root@llm27lp1 ~]# cat /proc/kallsyms | grep do_fork
c00000000006283c T .do_fork
==============================
User needs add "." to "do_fork"
kp.symbol_name = ".do_fork";
============================
This makes kprobe modules unportable. This fixes the problem.
Signed-off-by: Srinivasa Ds <srinivasa@in.ibm.com>
Signed-off-by: Ananth N Mavinakayanahalli <ananth@in.ibm.com>
Signed-off-by: Paul Mackerras <paulus@samba.org>
121 lines
3.8 KiB
C
121 lines
3.8 KiB
C
#ifndef _ASM_POWERPC_KPROBES_H
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#define _ASM_POWERPC_KPROBES_H
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#ifdef __KERNEL__
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/*
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* Kernel Probes (KProbes)
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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 (C) IBM Corporation, 2002, 2004
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*
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* 2002-Oct Created by Vamsi Krishna S <vamsi_krishna@in.ibm.com> Kernel
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* Probes initial implementation ( includes suggestions from
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* Rusty Russell).
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* 2004-Nov Modified for PPC64 by Ananth N Mavinakayanahalli
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* <ananth@in.ibm.com>
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*/
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#include <linux/types.h>
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#include <linux/ptrace.h>
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#include <linux/percpu.h>
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#define __ARCH_WANT_KPROBES_INSN_SLOT
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struct pt_regs;
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struct kprobe;
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typedef unsigned int kprobe_opcode_t;
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#define BREAKPOINT_INSTRUCTION 0x7fe00008 /* trap */
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#define MAX_INSN_SIZE 1
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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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/*
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* 64bit powerpc uses function descriptors.
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* Handle cases where:
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* - User passes a <.symbol> or <module:.symbol>
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* - User passes a <symbol> or <module:symbol>
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* - User passes a non-existant symbol, kallsyms_lookup_name
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* returns 0. Don't deref the NULL pointer in that case
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*/
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#define kprobe_lookup_name(name, addr) \
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{ \
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addr = (kprobe_opcode_t *)kallsyms_lookup_name(name); \
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if (addr) { \
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char *colon; \
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if ((colon = strchr(name, ':')) != NULL) { \
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colon++; \
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if (*colon != '\0' && *colon != '.') \
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addr = *(kprobe_opcode_t **)addr; \
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} else if (name[0] != '.') \
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addr = *(kprobe_opcode_t **)addr; \
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} else { \
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char dot_name[KSYM_NAME_LEN+1]; \
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dot_name[0] = '.'; \
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dot_name[1] = '\0'; \
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strncat(dot_name, name, KSYM_NAME_LEN); \
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addr = (kprobe_opcode_t *)kallsyms_lookup_name(dot_name); \
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} \
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}
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#define JPROBE_ENTRY(pentry) (kprobe_opcode_t *)((func_descr_t *)pentry)
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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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/* Use stock kprobe_lookup_name since ppc32 doesn't use function descriptors */
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#define JPROBE_ENTRY(pentry) (kprobe_opcode_t *)(pentry)
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#define is_trap(instr) (IS_TW(instr) || IS_TWI(instr))
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#endif
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#define ARCH_SUPPORTS_KRETPROBES
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#define ARCH_INACTIVE_KPROBE_COUNT 1
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#define flush_insn_slot(p) do { } while (0)
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void kretprobe_trampoline(void);
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extern void arch_remove_kprobe(struct kprobe *p);
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/* Architecture specific copy of original instruction */
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struct arch_specific_insn {
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/* copy of original instruction */
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kprobe_opcode_t *insn;
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/*
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* Set in kprobes code, initially to 0. If the instruction can be
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* eumulated, this is set to 1, if not, to -1.
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*/
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int boostable;
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};
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struct prev_kprobe {
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struct kprobe *kp;
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unsigned long status;
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unsigned long saved_msr;
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};
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/* per-cpu kprobe control block */
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struct kprobe_ctlblk {
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unsigned long kprobe_status;
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unsigned long kprobe_saved_msr;
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struct pt_regs jprobe_saved_regs;
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struct prev_kprobe prev_kprobe;
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};
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extern int kprobe_exceptions_notify(struct notifier_block *self,
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unsigned long val, void *data);
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#endif /* __KERNEL__ */
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#endif /* _ASM_POWERPC_KPROBES_H */
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