From: Anil S Keshavamurthy As many of you know that kprobes exist in the main line kernel for various architecture including i386, x86_64, ppc64 and sparc64. Attached patches following this mail are a port of Kprobes and Jprobes for IA64. I have tesed this patches for kprobes and Jprobes and this seems to work fine. I have tested this patch by inserting kprobes on various slots and various templates including various types of branch instructions. I have also tested this patch using the tool http://marc.theaimsgroup.com/?l=linux-kernel&m=111657358022586&w=2 and the kprobes for IA64 works great. Here is list of TODO things and pathes for the same will appear soon. 1) Support kprobes on "mov r1=ip" type of instruction 2) Support Kprobes and Jprobes to exist on the same address 3) Support Return probes 3) Architecture independent cleanup of kprobes This patch adds the kdebug die notification mechanism needed by Kprobes. For break instruction on Branch type slot, imm21 is ignored and value zero is placed in IIM register, hence we need to handle kprobes for switch case zero. Signed-off-by: Anil S Keshavamurthy Signed-off-by: Rusty Lynch Signed-off-by: Andrew Morton --- arch/ia64/kernel/traps.c | 33 ++++++++++++++++++++++++ arch/ia64/mm/fault.c | 8 ++++++ include/asm-ia64/break.h | 2 + include/asm-ia64/kdebug.h | 61 ++++++++++++++++++++++++++++++++++++++++++++++ 4 files changed, 103 insertions(+), 1 deletion(-) diff -puN arch/ia64/kernel/traps.c~kprobes-ia64-kdebug-die-notification arch/ia64/kernel/traps.c --- 25/arch/ia64/kernel/traps.c~kprobes-ia64-kdebug-die-notification Mon May 23 15:51:51 2005 +++ 25-akpm/arch/ia64/kernel/traps.c Mon May 23 15:51:51 2005 @@ -21,12 +21,26 @@ #include #include #include +#include extern spinlock_t timerlist_lock; fpswa_interface_t *fpswa_interface; EXPORT_SYMBOL(fpswa_interface); +struct notifier_block *ia64die_chain; +static DEFINE_SPINLOCK(die_notifier_lock); + +int register_die_notifier(struct notifier_block *nb) +{ + int err = 0; + unsigned long flags; + spin_lock_irqsave(&die_notifier_lock, flags); + err = notifier_chain_register(&ia64die_chain, nb); + spin_unlock_irqrestore(&die_notifier_lock, flags); + return err; +} + void __init trap_init (void) { @@ -119,6 +133,10 @@ ia64_bad_break (unsigned long break_num, switch (break_num) { case 0: /* unknown error (used by GCC for __builtin_abort()) */ + if (notify_die(DIE_BREAK, "kprobe", regs, break_num, TRAP_BRKPT, SIGTRAP) + == NOTIFY_STOP) { + return; + } die_if_kernel("bugcheck!", regs, break_num); sig = SIGILL; code = ILL_ILLOPC; break; @@ -171,6 +189,15 @@ ia64_bad_break (unsigned long break_num, sig = SIGILL; code = __ILL_BNDMOD; break; + case 0x80200: + case 0x80300: + if (notify_die(DIE_BREAK, "kprobe", regs, break_num, TRAP_BRKPT, SIGTRAP) + == NOTIFY_STOP) { + return; + } + sig = SIGTRAP; code = TRAP_BRKPT; + break; + default: if (break_num < 0x40000 || break_num > 0x100000) die_if_kernel("Bad break", regs, break_num); @@ -521,7 +548,11 @@ ia64_fault (unsigned long vector, unsign #endif break; case 35: siginfo.si_code = TRAP_BRANCH; ifa = 0; break; - case 36: siginfo.si_code = TRAP_TRACE; ifa = 0; break; + case 36: + if (notify_die(DIE_SS, "ss", ®s, vector, + vector, SIGTRAP) == NOTIFY_STOP) + return; + siginfo.si_code = TRAP_TRACE; ifa = 0; break; } siginfo.si_signo = SIGTRAP; siginfo.si_errno = 0; diff -puN arch/ia64/mm/fault.c~kprobes-ia64-kdebug-die-notification arch/ia64/mm/fault.c --- 25/arch/ia64/mm/fault.c~kprobes-ia64-kdebug-die-notification Mon May 23 15:51:51 2005 +++ 25-akpm/arch/ia64/mm/fault.c Mon May 23 15:51:51 2005 @@ -14,6 +14,7 @@ #include #include #include +#include extern void die (char *, struct pt_regs *, long); @@ -102,6 +103,13 @@ ia64_do_page_fault (unsigned long addres goto bad_area_no_up; #endif + /* + * This is to handle the kprobes on user space access instructions + */ + if (notify_die(DIE_PAGE_FAULT, "page fault", regs, code, TRAP_BRKPT, + SIGSEGV) == NOTIFY_STOP) + return; + down_read(&mm->mmap_sem); vma = find_vma_prev(mm, address, &prev_vma); diff -puN include/asm-ia64/break.h~kprobes-ia64-kdebug-die-notification include/asm-ia64/break.h --- 25/include/asm-ia64/break.h~kprobes-ia64-kdebug-die-notification Mon May 23 15:51:51 2005 +++ 25-akpm/include/asm-ia64/break.h Mon May 23 15:51:51 2005 @@ -12,6 +12,8 @@ * OS-specific debug break numbers: */ #define __IA64_BREAK_KDB 0x80100 +#define __IA64_BREAK_KPROBE 0x80200 +#define __IA64_BREAK_JPROBE 0x80300 /* * OS-specific break numbers: diff -puN /dev/null include/asm-ia64/kdebug.h --- /dev/null Thu Apr 11 07:25:15 2002 +++ 25-akpm/include/asm-ia64/kdebug.h Mon May 23 15:51:51 2005 @@ -0,0 +1,61 @@ +#ifndef _IA64_KDEBUG_H +#define _IA64_KDEBUG_H 1 +/* + * include/asm-ia64/kdebug.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) Intel Corporation, 2005 + * + * 2005-Apr Rusty Lynch and Anil S Keshavamurthy + * adopted from + * include/asm-x86_64/kdebug.h + */ +#include + +struct pt_regs; + +struct die_args { + struct pt_regs *regs; + const char *str; + long err; + int trapnr; + int signr; +}; + +int register_die_notifier(struct notifier_block *nb); +extern struct notifier_block *ia64die_chain; + +enum die_val { + DIE_BREAK = 1, + DIE_SS, + DIE_PAGE_FAULT, +}; + +static inline int notify_die(enum die_val val, char *str, struct pt_regs *regs, + long err, int trap, int sig) +{ + struct die_args args = { + .regs = regs, + .str = str, + .err = err, + .trapnr = trap, + .signr = sig + }; + + return notifier_call_chain(&ia64die_chain, val, &args); +} + +#endif _