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In an effort to make kprobe modules more portable, here is a patch that: o Introduces the "symbol_name" field to struct kprobe. The symbol->address resolution now happens in the kernel in an architecture agnostic manner. 64-bit powerpc users no longer have to specify the ".symbols" o Introduces the "offset" field to struct kprobe to allow a user to specify an offset into a symbol. o The legacy mechanism of specifying the kprobe.addr is still supported. However, if both the kprobe.addr and kprobe.symbol_name are specified, probe registration fails with an -EINVAL. o The symbol resolution code uses kallsyms_lookup_name(). So CONFIG_KPROBES now depends on CONFIG_KALLSYMS o Apparantly kprobe modules were the only legitimate out-of-tree user of the kallsyms_lookup_name() EXPORT. Now that the symbol resolution happens in-kernel, remove the EXPORT as suggested by Christoph Hellwig o Modify tcp_probe.c that uses the kprobe interface so as to make it work on multiple platforms (in its earlier form, the code wouldn't work, say, on powerpc) Signed-off-by: Ananth N Mavinakayanahalli <ananth@in.ibm.com> Signed-off-by: Prasanna S Panchamukhi <prasanna@in.ibm.com> Signed-off-by: Christoph Hellwig <hch@lst.de> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
98 lines
3.0 KiB
C
98 lines
3.0 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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/*
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* 64bit powerpc uses function descriptors.
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* Handle cases where:
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* - User passes a <.symbol>
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* - User passes a <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 (!(name[0] == '.') && addr) \
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addr = *(kprobe_opcode_t **)addr; \
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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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#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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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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