cdc7dbdfe6
In case of reentrance i.e when a probe handler calls a functions which inturn has a probe, we save a previous kprobe information and just single step the reentrant probe without calling the actual probe handler. During this reentracy period, if an interrupt occurs and if probe happens to trigger in the inturrupt path, then we were corrupting the previous kprobe( as we were overriding the previous kprobe info) info their by crashing the system. This patch fixes this issues by having a an array of previous kprobe info struct(with the array size of 2). This similar technique is not needed on i386 and x86_64 because by default interrupts are turn off in the break/int3 exception handler. Signed-off-by: Anil S Keshavamurthy <anil.s.keshavamurthy@intel.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Tony Luck <tony.luck@intel.com>
135 lines
3.7 KiB
C
135 lines
3.7 KiB
C
#ifndef _ASM_KPROBES_H
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#define _ASM_KPROBES_H
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/*
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* Kernel Probes (KProbes)
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* include/asm-ia64/kprobes.h
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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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* Copyright (C) Intel Corporation, 2005
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*
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* 2005-Apr Rusty Lynch <rusty.lynch@intel.com> and Anil S Keshavamurthy
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* <anil.s.keshavamurthy@intel.com> adapted from i386
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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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#include <asm/break.h>
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#define __ARCH_WANT_KPROBES_INSN_SLOT
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#define MAX_INSN_SIZE 1
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#define BREAK_INST (long)(__IA64_BREAK_KPROBE << 6)
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typedef union cmp_inst {
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struct {
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unsigned long long qp : 6;
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unsigned long long p1 : 6;
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unsigned long long c : 1;
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unsigned long long r2 : 7;
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unsigned long long r3 : 7;
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unsigned long long p2 : 6;
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unsigned long long ta : 1;
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unsigned long long x2 : 2;
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unsigned long long tb : 1;
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unsigned long long opcode : 4;
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unsigned long long reserved : 23;
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}f;
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unsigned long long l;
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} cmp_inst_t;
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struct kprobe;
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typedef struct _bundle {
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struct {
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unsigned long long template : 5;
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unsigned long long slot0 : 41;
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unsigned long long slot1_p0 : 64-46;
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} quad0;
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struct {
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unsigned long long slot1_p1 : 41 - (64-46);
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unsigned long long slot2 : 41;
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} quad1;
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} __attribute__((__aligned__(16))) bundle_t;
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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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};
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#define MAX_PARAM_RSE_SIZE (0x60+0x60/0x3f)
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/* per-cpu kprobe control block */
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#define ARCH_PREV_KPROBE_SZ 2
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struct kprobe_ctlblk {
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unsigned long kprobe_status;
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struct pt_regs jprobe_saved_regs;
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unsigned long jprobes_saved_stacked_regs[MAX_PARAM_RSE_SIZE];
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unsigned long *bsp;
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unsigned long cfm;
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atomic_t prev_kprobe_index;
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struct prev_kprobe prev_kprobe[ARCH_PREV_KPROBE_SZ];
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};
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#define JPROBE_ENTRY(pentry) (kprobe_opcode_t *)pentry
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#define ARCH_SUPPORTS_KRETPROBES
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#define ARCH_INACTIVE_KPROBE_COUNT 1
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#define SLOT0_OPCODE_SHIFT (37)
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#define SLOT1_p1_OPCODE_SHIFT (37 - (64-46))
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#define SLOT2_OPCODE_SHIFT (37)
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#define INDIRECT_CALL_OPCODE (1)
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#define IP_RELATIVE_CALL_OPCODE (5)
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#define IP_RELATIVE_BRANCH_OPCODE (4)
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#define IP_RELATIVE_PREDICT_OPCODE (7)
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#define LONG_BRANCH_OPCODE (0xC)
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#define LONG_CALL_OPCODE (0xD)
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#define flush_insn_slot(p) do { } while (0)
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typedef struct kprobe_opcode {
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bundle_t bundle;
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} kprobe_opcode_t;
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struct fnptr {
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unsigned long ip;
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unsigned long gp;
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};
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/* Architecture specific copy of original instruction*/
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struct arch_specific_insn {
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/* copy of the instruction to be emulated */
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kprobe_opcode_t *insn;
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#define INST_FLAG_FIX_RELATIVE_IP_ADDR 1
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#define INST_FLAG_FIX_BRANCH_REG 2
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#define INST_FLAG_BREAK_INST 4
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unsigned long inst_flag;
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unsigned short target_br_reg;
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unsigned short slot;
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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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/* ia64 does not need this */
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static inline void jprobe_return(void)
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{
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}
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extern void invalidate_stacked_regs(void);
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extern void flush_register_stack(void);
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extern void arch_remove_kprobe(struct kprobe *p);
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#endif /* _ASM_KPROBES_H */
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