[PATCH] Kprobes/IA64: arch specific handling
This is an IA64 arch specific handling of Kprobes Signed-off-by: Anil S Keshavamurthy <anil.s.keshavamurthy@intel.com> Signed-off-by: Rusty Lynch <Rusty.lynch@intel.com> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>hifive-unleashed-5.1
Anil S Keshavamurthy
Linus Torvalds
parent
7213b25218
commit
fd7b231ff9
|
|
@ -2,6 +2,17 @@ menu "Kernel hacking"
|
|||
|
||||
source "lib/Kconfig.debug"
|
||||
|
||||
config KPROBES
|
||||
bool "Kprobes"
|
||||
depends on DEBUG_KERNEL
|
||||
help
|
||||
Kprobes allows you to trap at almost any kernel address and
|
||||
execute a callback function. register_kprobe() establishes
|
||||
a probepoint and specifies the callback. Kprobes is useful
|
||||
for kernel debugging, non-intrusive instrumentation and testing.
|
||||
If in doubt, say "N".
|
||||
|
||||
|
||||
choice
|
||||
prompt "Physical memory granularity"
|
||||
default IA64_GRANULE_64MB
|
||||
|
|
|
|||
|
|
@ -20,6 +20,7 @@ obj-$(CONFIG_SMP) += smp.o smpboot.o domain.o
|
|||
obj-$(CONFIG_PERFMON) += perfmon_default_smpl.o
|
||||
obj-$(CONFIG_IA64_CYCLONE) += cyclone.o
|
||||
obj-$(CONFIG_IA64_MCA_RECOVERY) += mca_recovery.o
|
||||
obj-$(CONFIG_KPROBES) += kprobes.o
|
||||
obj-$(CONFIG_IA64_UNCACHED_ALLOCATOR) += uncached.o
|
||||
mca_recovery-y += mca_drv.o mca_drv_asm.o
|
||||
|
||||
|
|
|
|||
|
|
@ -0,0 +1,332 @@
|
|||
/*
|
||||
* Kernel Probes (KProbes)
|
||||
* arch/ia64/kernel/kprobes.c
|
||||
*
|
||||
* 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
|
||||
* Copyright (C) Intel Corporation, 2005
|
||||
*
|
||||
* 2005-Apr Rusty Lynch <rusty.lynch@intel.com> and Anil S Keshavamurthy
|
||||
* <anil.s.keshavamurthy@intel.com> adapted from i386
|
||||
*/
|
||||
|
||||
#include <linux/config.h>
|
||||
#include <linux/kprobes.h>
|
||||
#include <linux/ptrace.h>
|
||||
#include <linux/spinlock.h>
|
||||
#include <linux/string.h>
|
||||
#include <linux/slab.h>
|
||||
#include <linux/preempt.h>
|
||||
#include <linux/moduleloader.h>
|
||||
|
||||
#include <asm/pgtable.h>
|
||||
#include <asm/kdebug.h>
|
||||
|
||||
/* kprobe_status settings */
|
||||
#define KPROBE_HIT_ACTIVE 0x00000001
|
||||
#define KPROBE_HIT_SS 0x00000002
|
||||
|
||||
static struct kprobe *current_kprobe;
|
||||
static unsigned long kprobe_status;
|
||||
|
||||
enum instruction_type {A, I, M, F, B, L, X, u};
|
||||
static enum instruction_type bundle_encoding[32][3] = {
|
||||
{ M, I, I }, /* 00 */
|
||||
{ M, I, I }, /* 01 */
|
||||
{ M, I, I }, /* 02 */
|
||||
{ M, I, I }, /* 03 */
|
||||
{ M, L, X }, /* 04 */
|
||||
{ M, L, X }, /* 05 */
|
||||
{ u, u, u }, /* 06 */
|
||||
{ u, u, u }, /* 07 */
|
||||
{ M, M, I }, /* 08 */
|
||||
{ M, M, I }, /* 09 */
|
||||
{ M, M, I }, /* 0A */
|
||||
{ M, M, I }, /* 0B */
|
||||
{ M, F, I }, /* 0C */
|
||||
{ M, F, I }, /* 0D */
|
||||
{ M, M, F }, /* 0E */
|
||||
{ M, M, F }, /* 0F */
|
||||
{ M, I, B }, /* 10 */
|
||||
{ M, I, B }, /* 11 */
|
||||
{ M, B, B }, /* 12 */
|
||||
{ M, B, B }, /* 13 */
|
||||
{ u, u, u }, /* 14 */
|
||||
{ u, u, u }, /* 15 */
|
||||
{ B, B, B }, /* 16 */
|
||||
{ B, B, B }, /* 17 */
|
||||
{ M, M, B }, /* 18 */
|
||||
{ M, M, B }, /* 19 */
|
||||
{ u, u, u }, /* 1A */
|
||||
{ u, u, u }, /* 1B */
|
||||
{ M, F, B }, /* 1C */
|
||||
{ M, F, B }, /* 1D */
|
||||
{ u, u, u }, /* 1E */
|
||||
{ u, u, u }, /* 1F */
|
||||
};
|
||||
|
||||
int arch_prepare_kprobe(struct kprobe *p)
|
||||
{
|
||||
unsigned long addr = (unsigned long) p->addr;
|
||||
unsigned long bundle_addr = addr & ~0xFULL;
|
||||
unsigned long slot = addr & 0xf;
|
||||
bundle_t bundle;
|
||||
unsigned long template;
|
||||
|
||||
/*
|
||||
* TODO: Verify that a probe is not being inserted
|
||||
* in sensitive regions of code
|
||||
* TODO: Verify that the memory holding the probe is rwx
|
||||
* TODO: verify this is a kernel address
|
||||
*/
|
||||
memcpy(&bundle, (unsigned long *)bundle_addr, sizeof(bundle_t));
|
||||
template = bundle.quad0.template;
|
||||
if (((bundle_encoding[template][1] == L) && slot > 1) || (slot > 2)) {
|
||||
printk(KERN_WARNING "Attempting to insert unaligned kprobe at 0x%lx\n", addr);
|
||||
return -EINVAL;
|
||||
}
|
||||
return 0;
|
||||
}
|
||||
|
||||
void arch_copy_kprobe(struct kprobe *p)
|
||||
{
|
||||
unsigned long addr = (unsigned long)p->addr;
|
||||
unsigned long bundle_addr = addr & ~0xFULL;
|
||||
|
||||
memcpy(&p->ainsn.insn.bundle, (unsigned long *)bundle_addr,
|
||||
sizeof(bundle_t));
|
||||
memcpy(&p->opcode.bundle, &p->ainsn.insn.bundle, sizeof(bundle_t));
|
||||
}
|
||||
|
||||
void arch_arm_kprobe(struct kprobe *p)
|
||||
{
|
||||
unsigned long addr = (unsigned long)p->addr;
|
||||
unsigned long arm_addr = addr & ~0xFULL;
|
||||
unsigned long slot = addr & 0xf;
|
||||
unsigned long template;
|
||||
bundle_t bundle;
|
||||
|
||||
memcpy(&bundle, &p->ainsn.insn.bundle, sizeof(bundle_t));
|
||||
|
||||
template = bundle.quad0.template;
|
||||
if (slot == 1 && bundle_encoding[template][1] == L)
|
||||
slot = 2;
|
||||
switch (slot) {
|
||||
case 0:
|
||||
bundle.quad0.slot0 = BREAK_INST;
|
||||
break;
|
||||
case 1:
|
||||
bundle.quad0.slot1_p0 = BREAK_INST;
|
||||
bundle.quad1.slot1_p1 = (BREAK_INST >> (64-46));
|
||||
break;
|
||||
case 2:
|
||||
bundle.quad1.slot2 = BREAK_INST;
|
||||
break;
|
||||
}
|
||||
|
||||
/* Flush icache for the instruction at the emulated address */
|
||||
flush_icache_range((unsigned long)&p->ainsn.insn.bundle,
|
||||
(unsigned long)&p->ainsn.insn.bundle +
|
||||
sizeof(bundle_t));
|
||||
/*
|
||||
* Patch the original instruction with the probe instruction
|
||||
* and flush the instruction cache
|
||||
*/
|
||||
memcpy((char *) arm_addr, (char *) &bundle, sizeof(bundle_t));
|
||||
flush_icache_range(arm_addr, arm_addr + sizeof(bundle_t));
|
||||
}
|
||||
|
||||
void arch_disarm_kprobe(struct kprobe *p)
|
||||
{
|
||||
unsigned long addr = (unsigned long)p->addr;
|
||||
unsigned long arm_addr = addr & ~0xFULL;
|
||||
|
||||
/* p->opcode contains the original unaltered bundle */
|
||||
memcpy((char *) arm_addr, (char *) &p->opcode.bundle, sizeof(bundle_t));
|
||||
flush_icache_range(arm_addr, arm_addr + sizeof(bundle_t));
|
||||
}
|
||||
|
||||
void arch_remove_kprobe(struct kprobe *p)
|
||||
{
|
||||
}
|
||||
|
||||
/*
|
||||
* We are resuming execution after a single step fault, so the pt_regs
|
||||
* structure reflects the register state after we executed the instruction
|
||||
* located in the kprobe (p->ainsn.insn.bundle). We still need to adjust
|
||||
* the ip to point back to the original stack address, and if we see that
|
||||
* the slot has incremented back to zero, then we need to point to the next
|
||||
* slot location.
|
||||
*/
|
||||
static void resume_execution(struct kprobe *p, struct pt_regs *regs)
|
||||
{
|
||||
unsigned long bundle = (unsigned long)p->addr & ~0xFULL;
|
||||
|
||||
/*
|
||||
* TODO: Handle cases where kprobe was inserted on a branch instruction
|
||||
*/
|
||||
|
||||
if (!ia64_psr(regs)->ri)
|
||||
regs->cr_iip = bundle + 0x10;
|
||||
else
|
||||
regs->cr_iip = bundle;
|
||||
|
||||
ia64_psr(regs)->ss = 0;
|
||||
}
|
||||
|
||||
static void prepare_ss(struct kprobe *p, struct pt_regs *regs)
|
||||
{
|
||||
unsigned long bundle_addr = (unsigned long) &p->ainsn.insn.bundle;
|
||||
unsigned long slot = (unsigned long)p->addr & 0xf;
|
||||
|
||||
/* Update instruction pointer (IIP) and slot number (IPSR.ri) */
|
||||
regs->cr_iip = bundle_addr & ~0xFULL;
|
||||
|
||||
if (slot > 2)
|
||||
slot = 0;
|
||||
|
||||
ia64_psr(regs)->ri = slot;
|
||||
|
||||
/* turn on single stepping */
|
||||
ia64_psr(regs)->ss = 1;
|
||||
}
|
||||
|
||||
static int pre_kprobes_handler(struct pt_regs *regs)
|
||||
{
|
||||
struct kprobe *p;
|
||||
int ret = 0;
|
||||
kprobe_opcode_t *addr = (kprobe_opcode_t *)instruction_pointer(regs);
|
||||
|
||||
preempt_disable();
|
||||
|
||||
/* Handle recursion cases */
|
||||
if (kprobe_running()) {
|
||||
p = get_kprobe(addr);
|
||||
if (p) {
|
||||
if (kprobe_status == KPROBE_HIT_SS) {
|
||||
unlock_kprobes();
|
||||
goto no_kprobe;
|
||||
}
|
||||
arch_disarm_kprobe(p);
|
||||
ret = 1;
|
||||
} else {
|
||||
/*
|
||||
* jprobe instrumented function just completed
|
||||
*/
|
||||
p = current_kprobe;
|
||||
if (p->break_handler && p->break_handler(p, regs)) {
|
||||
goto ss_probe;
|
||||
}
|
||||
}
|
||||
}
|
||||
|
||||
lock_kprobes();
|
||||
p = get_kprobe(addr);
|
||||
if (!p) {
|
||||
unlock_kprobes();
|
||||
goto no_kprobe;
|
||||
}
|
||||
|
||||
kprobe_status = KPROBE_HIT_ACTIVE;
|
||||
current_kprobe = p;
|
||||
|
||||
if (p->pre_handler && p->pre_handler(p, regs))
|
||||
/*
|
||||
* Our pre-handler is specifically requesting that we just
|
||||
* do a return. This is handling the case where the
|
||||
* pre-handler is really our special jprobe pre-handler.
|
||||
*/
|
||||
return 1;
|
||||
|
||||
ss_probe:
|
||||
prepare_ss(p, regs);
|
||||
kprobe_status = KPROBE_HIT_SS;
|
||||
return 1;
|
||||
|
||||
no_kprobe:
|
||||
preempt_enable_no_resched();
|
||||
return ret;
|
||||
}
|
||||
|
||||
static int post_kprobes_handler(struct pt_regs *regs)
|
||||
{
|
||||
if (!kprobe_running())
|
||||
return 0;
|
||||
|
||||
if (current_kprobe->post_handler)
|
||||
current_kprobe->post_handler(current_kprobe, regs, 0);
|
||||
|
||||
resume_execution(current_kprobe, regs);
|
||||
|
||||
unlock_kprobes();
|
||||
preempt_enable_no_resched();
|
||||
return 1;
|
||||
}
|
||||
|
||||
static int kprobes_fault_handler(struct pt_regs *regs, int trapnr)
|
||||
{
|
||||
if (!kprobe_running())
|
||||
return 0;
|
||||
|
||||
if (current_kprobe->fault_handler &&
|
||||
current_kprobe->fault_handler(current_kprobe, regs, trapnr))
|
||||
return 1;
|
||||
|
||||
if (kprobe_status & KPROBE_HIT_SS) {
|
||||
resume_execution(current_kprobe, regs);
|
||||
unlock_kprobes();
|
||||
preempt_enable_no_resched();
|
||||
}
|
||||
|
||||
return 0;
|
||||
}
|
||||
|
||||
int kprobe_exceptions_notify(struct notifier_block *self, unsigned long val,
|
||||
void *data)
|
||||
{
|
||||
struct die_args *args = (struct die_args *)data;
|
||||
switch(val) {
|
||||
case DIE_BREAK:
|
||||
if (pre_kprobes_handler(args->regs))
|
||||
return NOTIFY_STOP;
|
||||
break;
|
||||
case DIE_SS:
|
||||
if (post_kprobes_handler(args->regs))
|
||||
return NOTIFY_STOP;
|
||||
break;
|
||||
case DIE_PAGE_FAULT:
|
||||
if (kprobes_fault_handler(args->regs, args->trapnr))
|
||||
return NOTIFY_STOP;
|
||||
default:
|
||||
break;
|
||||
}
|
||||
return NOTIFY_DONE;
|
||||
}
|
||||
|
||||
int setjmp_pre_handler(struct kprobe *p, struct pt_regs *regs)
|
||||
{
|
||||
printk(KERN_WARNING "Jprobes is not supported\n");
|
||||
return 0;
|
||||
}
|
||||
|
||||
void jprobe_return(void)
|
||||
{
|
||||
}
|
||||
|
||||
int longjmp_break_handler(struct kprobe *p, struct pt_regs *regs)
|
||||
{
|
||||
return 0;
|
||||
}
|
||||
|
|
@ -0,0 +1,72 @@
|
|||
#ifndef _ASM_KPROBES_H
|
||||
#define _ASM_KPROBES_H
|
||||
/*
|
||||
* Kernel Probes (KProbes)
|
||||
* include/asm-ia64/kprobes.h
|
||||
*
|
||||
* 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
|
||||
* Copyright (C) Intel Corporation, 2005
|
||||
*
|
||||
* 2005-Apr Rusty Lynch <rusty.lynch@intel.com> and Anil S Keshavamurthy
|
||||
* <anil.s.keshavamurthy@intel.com> adapted from i386
|
||||
*/
|
||||
#include <linux/types.h>
|
||||
#include <linux/ptrace.h>
|
||||
#include <asm/break.h>
|
||||
|
||||
#define BREAK_INST (long)(__IA64_BREAK_KPROBE << 6)
|
||||
|
||||
typedef struct _bundle {
|
||||
struct {
|
||||
unsigned long long template : 5;
|
||||
unsigned long long slot0 : 41;
|
||||
unsigned long long slot1_p0 : 64-46;
|
||||
} quad0;
|
||||
struct {
|
||||
unsigned long long slot1_p1 : 41 - (64-46);
|
||||
unsigned long long slot2 : 41;
|
||||
} quad1;
|
||||
} __attribute__((__aligned__(16))) bundle_t;
|
||||
|
||||
#define JPROBE_ENTRY(pentry) (kprobe_opcode_t *)pentry
|
||||
|
||||
typedef struct kprobe_opcode {
|
||||
bundle_t bundle;
|
||||
} kprobe_opcode_t;
|
||||
|
||||
struct fnptr {
|
||||
unsigned long ip;
|
||||
unsigned long gp;
|
||||
};
|
||||
|
||||
/* Architecture specific copy of original instruction*/
|
||||
struct arch_specific_insn {
|
||||
/* copy of the original instruction */
|
||||
kprobe_opcode_t insn;
|
||||
};
|
||||
|
||||
#ifdef CONFIG_KPROBES
|
||||
extern int kprobe_exceptions_notify(struct notifier_block *self,
|
||||
unsigned long val, void *data);
|
||||
#else /* !CONFIG_KPROBES */
|
||||
static inline int kprobe_exceptions_notify(struct notifier_block *self,
|
||||
unsigned long val, void *data)
|
||||
{
|
||||
return 0;
|
||||
}
|
||||
#endif
|
||||
#endif /* _ASM_KPROBES_H */
|
||||
Loading…
Reference in New Issue