1 files changed, 751 insertions, 0 deletions

diff --git a/arch/x86/kernel/kprobes_32.c b/arch/x86/kernel/kprobes_32.c
new file mode 100644
index 000000000000..448a50b1324c
--- /dev/null
+++ b/arch/x86/kernel/kprobes_32.c
@@ -0,0 +1,751 @@
+/*
+ *  Kernel Probes (KProbes)
+ *  arch/i386/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
+ *
+ * 2002-Oct     Created by Vamsi Krishna S <vamsi_krishna@in.ibm.com> Kernel
+ *              Probes initial implementation ( includes contributions from
+ *              Rusty Russell).
+ * 2004-July    Suparna Bhattacharya <suparna@in.ibm.com> added jumper probes
+ *              interface to access function arguments.
+ * 2005-May     Hien Nguyen <hien@us.ibm.com>, Jim Keniston
+ *              <jkenisto@us.ibm.com> and Prasanna S Panchamukhi
+ *              <prasanna@in.ibm.com> added function-return probes.
+ */
+
+#include <linux/kprobes.h>
+#include <linux/ptrace.h>
+#include <linux/preempt.h>
+#include <linux/kdebug.h>
+#include <asm/cacheflush.h>
+#include <asm/desc.h>
+#include <asm/uaccess.h>
+#include <asm/alternative.h>
+
+void jprobe_return_end(void);
+
+DEFINE_PER_CPU(struct kprobe *, current_kprobe) = NULL;
+DEFINE_PER_CPU(struct kprobe_ctlblk, kprobe_ctlblk);
+
+/* insert a jmp code */
+static __always_inline void set_jmp_op(void *from, void *to)
+{
+        struct __arch_jmp_op {
+                char op;
+                long raddr;
+        } __attribute__((packed)) *jop;
+        jop = (struct __arch_jmp_op *)from;
+        jop->raddr = (long)(to) - ((long)(from) + 5);
+        jop->op = RELATIVEJUMP_INSTRUCTION;
+}
+
+/*
+ * returns non-zero if opcodes can be boosted.
+ */
+static __always_inline int can_boost(kprobe_opcode_t *opcodes)
+{
+#define W(row,b0,b1,b2,b3,b4,b5,b6,b7,b8,b9,ba,bb,bc,bd,be,bf)                \
+        (((b0##UL << 0x0)|(b1##UL << 0x1)|(b2##UL << 0x2)|(b3##UL << 0x3) |   \
+          (b4##UL << 0x4)|(b5##UL << 0x5)|(b6##UL << 0x6)|(b7##UL << 0x7) |   \
+          (b8##UL << 0x8)|(b9##UL << 0x9)|(ba##UL << 0xa)|(bb##UL << 0xb) |   \
+          (bc##UL << 0xc)|(bd##UL << 0xd)|(be##UL << 0xe)|(bf##UL << 0xf))    \
+         << (row % 32))
+        /*
+         * Undefined/reserved opcodes, conditional jump, Opcode Extension
+         * Groups, and some special opcodes can not be boost.
+         */
+        static const unsigned long twobyte_is_boostable[256 / 32] = {
+                /*      0 1 2 3 4 5 6 7 8 9 a b c d e f         */
+                /*      -------------------------------         */
+                W(0x00, 0,0,1,1,0,0,1,0,1,1,0,0,0,0,0,0)| /* 00 */
+                W(0x10, 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0), /* 10 */
+                W(0x20, 1,1,1,1,0,0,0,0,0,0,0,0,0,0,0,0)| /* 20 */
+                W(0x30, 0,1,0,0,0,0,0,0,0,0,0,0,0,0,0,0), /* 30 */
+                W(0x40, 1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1)| /* 40 */
+                W(0x50, 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0), /* 50 */
+                W(0x60, 1,1,1,1,1,1,1,1,1,1,1,1,0,0,1,1)| /* 60 */
+                W(0x70, 0,0,0,0,1,1,1,1,0,0,0,0,0,0,1,1), /* 70 */
+                W(0x80, 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0)| /* 80 */
+                W(0x90, 1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1), /* 90 */
+                W(0xa0, 1,1,0,1,1,1,0,0,1,1,0,1,1,1,0,1)| /* a0 */
+                W(0xb0, 1,1,1,1,1,1,1,1,0,0,0,1,1,1,1,1), /* b0 */
+                W(0xc0, 1,1,0,0,0,0,0,0,1,1,1,1,1,1,1,1)| /* c0 */
+                W(0xd0, 0,1,1,1,0,1,0,0,1,1,0,1,1,1,0,1), /* d0 */
+                W(0xe0, 0,1,1,0,0,1,0,0,1,1,0,1,1,1,0,1)| /* e0 */
+                W(0xf0, 0,1,1,1,0,1,0,0,1,1,1,0,1,1,1,0)  /* f0 */
+                /*      -------------------------------         */
+                /*      0 1 2 3 4 5 6 7 8 9 a b c d e f         */
+        };
+#undef W
+        kprobe_opcode_t opcode;
+        kprobe_opcode_t *orig_opcodes = opcodes;
+retry:
+        if (opcodes - orig_opcodes > MAX_INSN_SIZE - 1)
+                return 0;
+        opcode = *(opcodes++);
+
+        /* 2nd-byte opcode */
+        if (opcode == 0x0f) {
+                if (opcodes - orig_opcodes > MAX_INSN_SIZE - 1)
+                        return 0;
+                return test_bit(*opcodes, twobyte_is_boostable);
+        }
+
+        switch (opcode & 0xf0) {
+        case 0x60:
+                if (0x63 < opcode && opcode < 0x67)
+                        goto retry; /* prefixes */
+                /* can't boost Address-size override and bound */
+                return (opcode != 0x62 && opcode != 0x67);
+        case 0x70:
+                return 0; /* can't boost conditional jump */
+        case 0xc0:
+                /* can't boost software-interruptions */
+                return (0xc1 < opcode && opcode < 0xcc) || opcode == 0xcf;
+        case 0xd0:
+                /* can boost AA* and XLAT */
+                return (opcode == 0xd4 || opcode == 0xd5 || opcode == 0xd7);
+        case 0xe0:
+                /* can boost in/out and absolute jmps */
+                return ((opcode & 0x04) || opcode == 0xea);
+        case 0xf0:
+                if ((opcode & 0x0c) == 0 && opcode != 0xf1)
+                        goto retry; /* lock/rep(ne) prefix */
+                /* clear and set flags can be boost */
+                return (opcode == 0xf5 || (0xf7 < opcode && opcode < 0xfe));
+        default:
+                if (opcode == 0x26 || opcode == 0x36 || opcode == 0x3e)
+                        goto retry; /* prefixes */
+                /* can't boost CS override and call */
+                return (opcode != 0x2e && opcode != 0x9a);
+        }
+}
+
+/*
+ * returns non-zero if opcode modifies the interrupt flag.
+ */
+static int __kprobes is_IF_modifier(kprobe_opcode_t opcode)
+{
+        switch (opcode) {
+        case 0xfa:              /* cli */
+        case 0xfb:              /* sti */
+        case 0xcf:              /* iret/iretd */
+        case 0x9d:              /* popf/popfd */
+                return 1;
+        }
+        return 0;
+}
+
+int __kprobes arch_prepare_kprobe(struct kprobe *p)
+{
+        /* insn: must be on special executable page on i386. */
+        p->ainsn.insn = get_insn_slot();
+        if (!p->ainsn.insn)
+                return -ENOMEM;
+
+        memcpy(p->ainsn.insn, p->addr, MAX_INSN_SIZE * sizeof(kprobe_opcode_t));
+        p->opcode = *p->addr;
+        if (can_boost(p->addr)) {
+                p->ainsn.boostable = 0;
+        } else {
+                p->ainsn.boostable = -1;
+        }
+        return 0;
+}
+
+void __kprobes arch_arm_kprobe(struct kprobe *p)
+{
+        text_poke(p->addr, ((unsigned char []){BREAKPOINT_INSTRUCTION}), 1);
+}
+
+void __kprobes arch_disarm_kprobe(struct kprobe *p)
+{
+        text_poke(p->addr, &p->opcode, 1);
+}
+
+void __kprobes arch_remove_kprobe(struct kprobe *p)
+{
+        mutex_lock(&kprobe_mutex);
+        free_insn_slot(p->ainsn.insn, (p->ainsn.boostable == 1));
+        mutex_unlock(&kprobe_mutex);
+}
+
+static void __kprobes save_previous_kprobe(struct kprobe_ctlblk *kcb)
+{
+        kcb->prev_kprobe.kp = kprobe_running();
+        kcb->prev_kprobe.status = kcb->kprobe_status;
+        kcb->prev_kprobe.old_eflags = kcb->kprobe_old_eflags;
+        kcb->prev_kprobe.saved_eflags = kcb->kprobe_saved_eflags;
+}
+
+static void __kprobes restore_previous_kprobe(struct kprobe_ctlblk *kcb)
+{
+        __get_cpu_var(current_kprobe) = kcb->prev_kprobe.kp;
+        kcb->kprobe_status = kcb->prev_kprobe.status;
+        kcb->kprobe_old_eflags = kcb->prev_kprobe.old_eflags;
+        kcb->kprobe_saved_eflags = kcb->prev_kprobe.saved_eflags;
+}
+
+static void __kprobes set_current_kprobe(struct kprobe *p, struct pt_regs *regs,
+                                struct kprobe_ctlblk *kcb)
+{
+        __get_cpu_var(current_kprobe) = p;
+        kcb->kprobe_saved_eflags = kcb->kprobe_old_eflags
+                = (regs->eflags & (TF_MASK | IF_MASK));
+        if (is_IF_modifier(p->opcode))
+                kcb->kprobe_saved_eflags &= ~IF_MASK;
+}
+
+static void __kprobes prepare_singlestep(struct kprobe *p, struct pt_regs *regs)
+{
+        regs->eflags |= TF_MASK;
+        regs->eflags &= ~IF_MASK;
+        /*single step inline if the instruction is an int3*/
+        if (p->opcode == BREAKPOINT_INSTRUCTION)
+                regs->eip = (unsigned long)p->addr;
+        else
+                regs->eip = (unsigned long)p->ainsn.insn;
+}
+
+/* Called with kretprobe_lock held */
+void __kprobes arch_prepare_kretprobe(struct kretprobe_instance *ri,
+                                      struct pt_regs *regs)
+{
+        unsigned long *sara = (unsigned long *)&regs->esp;
+
+        ri->ret_addr = (kprobe_opcode_t *) *sara;
+
+        /* Replace the return addr with trampoline addr */
+        *sara = (unsigned long) &kretprobe_trampoline;
+}
+
+/*
+ * Interrupts are disabled on entry as trap3 is an interrupt gate and they
+ * remain disabled thorough out this function.
+ */
+static int __kprobes kprobe_handler(struct pt_regs *regs)
+{
+        struct kprobe *p;
+        int ret = 0;
+        kprobe_opcode_t *addr;
+        struct kprobe_ctlblk *kcb;
+
+        addr = (kprobe_opcode_t *)(regs->eip - sizeof(kprobe_opcode_t));
+
+        /*
+         * We don't want to be preempted for the entire
+         * duration of kprobe processing
+         */
+        preempt_disable();
+        kcb = get_kprobe_ctlblk();
+
+        /* Check we're not actually recursing */
+        if (kprobe_running()) {
+                p = get_kprobe(addr);
+                if (p) {
+                        if (kcb->kprobe_status == KPROBE_HIT_SS &&
+                                *p->ainsn.insn == BREAKPOINT_INSTRUCTION) {
+                                regs->eflags &= ~TF_MASK;
+                                regs->eflags |= kcb->kprobe_saved_eflags;
+                                goto no_kprobe;
+                        }
+                        /* We have reentered the kprobe_handler(), since
+                         * another probe was hit while within the handler.
+                         * We here save the original kprobes variables and
+                         * just single step on the instruction of the new probe
+                         * without calling any user handlers.
+                         */
+                        save_previous_kprobe(kcb);
+                        set_current_kprobe(p, regs, kcb);
+                        kprobes_inc_nmissed_count(p);
+                        prepare_singlestep(p, regs);
+                        kcb->kprobe_status = KPROBE_REENTER;
+                        return 1;
+                } else {
+                        if (*addr != BREAKPOINT_INSTRUCTION) {
+                        /* The breakpoint instruction was removed by
+                         * another cpu right after we hit, no further
+                         * handling of this interrupt is appropriate
+                         */
+                                regs->eip -= sizeof(kprobe_opcode_t);
+                                ret = 1;
+                                goto no_kprobe;
+                        }
+                        p = __get_cpu_var(current_kprobe);
+                        if (p->break_handler && p->break_handler(p, regs)) {
+                                goto ss_probe;
+                        }
+                }
+                goto no_kprobe;
+        }
+
+        p = get_kprobe(addr);
+        if (!p) {
+                if (*addr != BREAKPOINT_INSTRUCTION) {
+                        /*
+                         * The breakpoint instruction was removed right
+                         * after we hit it.  Another cpu has removed
+                         * either a probepoint or a debugger breakpoint
+                         * at this address.  In either case, no further
+                         * handling of this interrupt is appropriate.
+                         * Back up over the (now missing) int3 and run
+                         * the original instruction.
+                         */
+                        regs->eip -= sizeof(kprobe_opcode_t);
+                        ret = 1;
+                }
+                /* Not one of ours: let kernel handle it */
+                goto no_kprobe;
+        }
+
+        set_current_kprobe(p, regs, kcb);
+        kcb->kprobe_status = KPROBE_HIT_ACTIVE;
+
+        if (p->pre_handler && p->pre_handler(p, regs))
+                /* handler has already set things up, so skip ss setup */
+                return 1;
+
+ss_probe:
+#if !defined(CONFIG_PREEMPT) || defined(CONFIG_PM)
+        if (p->ainsn.boostable == 1 && !p->post_handler){
+                /* Boost up -- we can execute copied instructions directly */
+                reset_current_kprobe();
+                regs->eip = (unsigned long)p->ainsn.insn;
+                preempt_enable_no_resched();
+                return 1;
+        }
+#endif
+        prepare_singlestep(p, regs);
+        kcb->kprobe_status = KPROBE_HIT_SS;
+        return 1;
+
+no_kprobe:
+        preempt_enable_no_resched();
+        return ret;
+}
+
+/*
+ * For function-return probes, init_kprobes() establishes a probepoint
+ * here. When a retprobed function returns, this probe is hit and
+ * trampoline_probe_handler() runs, calling the kretprobe's handler.
+ */
+ void __kprobes kretprobe_trampoline_holder(void)
+ {
+        asm volatile ( ".global kretprobe_trampoline\n"
+                        "kretprobe_trampoline: \n"
+                        "       pushf\n"
+                        /* skip cs, eip, orig_eax */
+                        "       subl $12, %esp\n"
+                        "       pushl %fs\n"
+                        "       pushl %ds\n"
+                        "       pushl %es\n"
+                        "       pushl %eax\n"
+                        "       pushl %ebp\n"
+                        "       pushl %edi\n"
+                        "       pushl %esi\n"
+                        "       pushl %edx\n"
+                        "       pushl %ecx\n"
+                        "       pushl %ebx\n"
+                        "       movl %esp, %eax\n"
+                        "       call trampoline_handler\n"
+                        /* move eflags to cs */
+                        "       movl 52(%esp), %edx\n"
+                        "       movl %edx, 48(%esp)\n"
+                        /* save true return address on eflags */
+                        "       movl %eax, 52(%esp)\n"
+                        "       popl %ebx\n"
+                        "       popl %ecx\n"
+                        "       popl %edx\n"
+                        "       popl %esi\n"
+                        "       popl %edi\n"
+                        "       popl %ebp\n"
+                        "       popl %eax\n"
+                        /* skip eip, orig_eax, es, ds, fs */
+                        "       addl $20, %esp\n"
+                        "       popf\n"
+                        "       ret\n");
+}
+
+/*
+ * Called from kretprobe_trampoline
+ */
+fastcall void *__kprobes trampoline_handler(struct pt_regs *regs)
+{
+        struct kretprobe_instance *ri = NULL;
+        struct hlist_head *head, empty_rp;
+        struct hlist_node *node, *tmp;
+        unsigned long flags, orig_ret_address = 0;
+        unsigned long trampoline_address =(unsigned long)&kretprobe_trampoline;
+
+        INIT_HLIST_HEAD(&empty_rp);
+        spin_lock_irqsave(&kretprobe_lock, flags);
+        head = kretprobe_inst_table_head(current);
+        /* fixup registers */
+        regs->xcs = __KERNEL_CS | get_kernel_rpl();
+        regs->eip = trampoline_address;
+        regs->orig_eax = 0xffffffff;
+
+        /*
+         * It is possible to have multiple instances associated with a given
+         * task either because an multiple functions in the call path
+         * have a return probe installed on them, and/or more then one return
+         * return probe was registered for a target function.
+         *
+         * We can handle this because:
+         *     - instances are always inserted at the head of the list
+         *     - when multiple return probes are registered for the same
+         *       function, the first instance's ret_addr will point to the
+         *       real return address, and all the rest will point to
+         *       kretprobe_trampoline
+         */
+        hlist_for_each_entry_safe(ri, node, tmp, head, hlist) {
+                if (ri->task != current)
+                        /* another task is sharing our hash bucket */
+                        continue;
+
+                if (ri->rp && ri->rp->handler){
+                        __get_cpu_var(current_kprobe) = &ri->rp->kp;
+                        get_kprobe_ctlblk()->kprobe_status = KPROBE_HIT_ACTIVE;
+                        ri->rp->handler(ri, regs);
+                        __get_cpu_var(current_kprobe) = NULL;
+                }
+
+                orig_ret_address = (unsigned long)ri->ret_addr;
+                recycle_rp_inst(ri, &empty_rp);
+
+                if (orig_ret_address != trampoline_address)
+                        /*
+                         * This is the real return address. Any other
+                         * instances associated with this task are for
+                         * other calls deeper on the call stack
+                         */
+                        break;
+        }
+
+        kretprobe_assert(ri, orig_ret_address, trampoline_address);
+        spin_unlock_irqrestore(&kretprobe_lock, flags);
+
+        hlist_for_each_entry_safe(ri, node, tmp, &empty_rp, hlist) {
+                hlist_del(&ri->hlist);
+                kfree(ri);
+        }
+        return (void*)orig_ret_address;
+}
+
+/*
+ * Called after single-stepping.  p->addr is the address of the
+ * instruction whose first byte has been replaced by the "int 3"
+ * instruction.  To avoid the SMP problems that can occur when we
+ * temporarily put back the original opcode to single-step, we
+ * single-stepped a copy of the instruction.  The address of this
+ * copy is p->ainsn.insn.
+ *
+ * This function prepares to return from the post-single-step
+ * interrupt.  We have to fix up the stack as follows:
+ *
+ * 0) Except in the case of absolute or indirect jump or call instructions,
+ * the new eip is relative to the copied instruction.  We need to make
+ * it relative to the original instruction.
+ *
+ * 1) If the single-stepped instruction was pushfl, then the TF and IF
+ * flags are set in the just-pushed eflags, and may need to be cleared.
+ *
+ * 2) If the single-stepped instruction was a call, the return address
+ * that is atop the stack is the address following the copied instruction.
+ * We need to make it the address following the original instruction.
+ *
+ * This function also checks instruction size for preparing direct execution.
+ */
+static void __kprobes resume_execution(struct kprobe *p,
+                struct pt_regs *regs, struct kprobe_ctlblk *kcb)
+{
+        unsigned long *tos = (unsigned long *)&regs->esp;
+        unsigned long copy_eip = (unsigned long)p->ainsn.insn;
+        unsigned long orig_eip = (unsigned long)p->addr;
+
+        regs->eflags &= ~TF_MASK;
+        switch (p->ainsn.insn[0]) {
+        case 0x9c:              /* pushfl */
+                *tos &= ~(TF_MASK | IF_MASK);
+                *tos |= kcb->kprobe_old_eflags;
+                break;
+        case 0xc2:              /* iret/ret/lret */
+        case 0xc3:
+        case 0xca:
+        case 0xcb:
+        case 0xcf:
+        case 0xea:              /* jmp absolute -- eip is correct */
+                /* eip is already adjusted, no more changes required */
+                p->ainsn.boostable = 1;
+                goto no_change;
+        case 0xe8:              /* call relative - Fix return addr */
+                *tos = orig_eip + (*tos - copy_eip);
+                break;
+        case 0x9a:              /* call absolute -- same as call absolute, indirect */
+                *tos = orig_eip + (*tos - copy_eip);
+                goto no_change;
+        case 0xff:
+                if ((p->ainsn.insn[1] & 0x30) == 0x10) {
+                        /*
+                         * call absolute, indirect
+                         * Fix return addr; eip is correct.
+                         * But this is not boostable
+                         */
+                        *tos = orig_eip + (*tos - copy_eip);
+                        goto no_change;
+                } else if (((p->ainsn.insn[1] & 0x31) == 0x20) ||       /* jmp near, absolute indirect */
+                           ((p->ainsn.insn[1] & 0x31) == 0x21)) {       /* jmp far, absolute indirect */
+                        /* eip is correct. And this is boostable */
+                        p->ainsn.boostable = 1;
+                        goto no_change;
+                }
+        default:
+                break;
+        }
+
+        if (p->ainsn.boostable == 0) {
+                if ((regs->eip > copy_eip) &&
+                    (regs->eip - copy_eip) + 5 < MAX_INSN_SIZE) {
+                        /*
+                         * These instructions can be executed directly if it
+                         * jumps back to correct address.
+                         */
+                        set_jmp_op((void *)regs->eip,
+                                   (void *)orig_eip + (regs->eip - copy_eip));
+                        p->ainsn.boostable = 1;
+                } else {
+                        p->ainsn.boostable = -1;
+                }
+        }
+
+        regs->eip = orig_eip + (regs->eip - copy_eip);
+
+no_change:
+        return;
+}
+
+/*
+ * Interrupts are disabled on entry as trap1 is an interrupt gate and they
+ * remain disabled thoroughout this function.
+ */
+static int __kprobes post_kprobe_handler(struct pt_regs *regs)
+{
+        struct kprobe *cur = kprobe_running();
+        struct kprobe_ctlblk *kcb = get_kprobe_ctlblk();
+
+        if (!cur)
+                return 0;
+
+        if ((kcb->kprobe_status != KPROBE_REENTER) && cur->post_handler) {
+                kcb->kprobe_status = KPROBE_HIT_SSDONE;
+                cur->post_handler(cur, regs, 0);
+        }
+
+        resume_execution(cur, regs, kcb);
+        regs->eflags |= kcb->kprobe_saved_eflags;
+
+        /*Restore back the original saved kprobes variables and continue. */
+        if (kcb->kprobe_status == KPROBE_REENTER) {
+                restore_previous_kprobe(kcb);
+                goto out;
+        }
+        reset_current_kprobe();
+out:
+        preempt_enable_no_resched();
+
+        /*
+         * if somebody else is singlestepping across a probe point, eflags
+         * will have TF set, in which case, continue the remaining processing
+         * of do_debug, as if this is not a probe hit.
+         */
+        if (regs->eflags & TF_MASK)
+                return 0;
+
+        return 1;
+}
+
+static int __kprobes kprobe_fault_handler(struct pt_regs *regs, int trapnr)
+{
+        struct kprobe *cur = kprobe_running();
+        struct kprobe_ctlblk *kcb = get_kprobe_ctlblk();
+
+        switch(kcb->kprobe_status) {
+        case KPROBE_HIT_SS:
+        case KPROBE_REENTER:
+                /*
+                 * We are here because the instruction being single
+                 * stepped caused a page fault. We reset the current
+                 * kprobe and the eip points back to the probe address
+                 * and allow the page fault handler to continue as a
+                 * normal page fault.
+                 */
+                regs->eip = (unsigned long)cur->addr;
+                regs->eflags |= kcb->kprobe_old_eflags;
+                if (kcb->kprobe_status == KPROBE_REENTER)
+                        restore_previous_kprobe(kcb);
+                else
+                        reset_current_kprobe();
+                preempt_enable_no_resched();
+                break;
+        case KPROBE_HIT_ACTIVE:
+        case KPROBE_HIT_SSDONE:
+                /*
+                 * We increment the nmissed count for accounting,
+                 * we can also use npre/npostfault count for accouting
+                 * these specific fault cases.
+                 */
+                kprobes_inc_nmissed_count(cur);
+
+                /*
+                 * We come here because instructions in the pre/post
+                 * handler caused the page_fault, this could happen
+                 * if handler tries to access user space by
+                 * copy_from_user(), get_user() etc. Let the
+                 * user-specified handler try to fix it first.
+                 */
+                if (cur->fault_handler && cur->fault_handler(cur, regs, trapnr))
+                        return 1;
+
+                /*
+                 * In case the user-specified fault handler returned
+                 * zero, try to fix up.
+                 */
+                if (fixup_exception(regs))
+                        return 1;
+
+                /*
+                 * fixup_exception() could not handle it,
+                 * Let do_page_fault() fix it.
+                 */
+                break;
+        default:
+                break;
+        }
+        return 0;
+}
+
+/*
+ * Wrapper routine to for handling exceptions.
+ */
+int __kprobes kprobe_exceptions_notify(struct notifier_block *self,
+                                       unsigned long val, void *data)
+{
+        struct die_args *args = (struct die_args *)data;
+        int ret = NOTIFY_DONE;
+
+        if (args->regs && user_mode_vm(args->regs))
+                return ret;
+
+        switch (val) {
+        case DIE_INT3:
+                if (kprobe_handler(args->regs))
+                        ret = NOTIFY_STOP;
+                break;
+        case DIE_DEBUG:
+                if (post_kprobe_handler(args->regs))
+                        ret = NOTIFY_STOP;
+                break;
+        case DIE_GPF:
+        case DIE_PAGE_FAULT:
+                /* kprobe_running() needs smp_processor_id() */
+                preempt_disable();
+                if (kprobe_running() &&
+                    kprobe_fault_handler(args->regs, args->trapnr))
+                        ret = NOTIFY_STOP;
+                preempt_enable();
+                break;
+        default:
+                break;
+        }
+        return ret;
+}
+
+int __kprobes setjmp_pre_handler(struct kprobe *p, struct pt_regs *regs)
+{
+        struct jprobe *jp = container_of(p, struct jprobe, kp);
+        unsigned long addr;
+        struct kprobe_ctlblk *kcb = get_kprobe_ctlblk();
+
+        kcb->jprobe_saved_regs = *regs;
+        kcb->jprobe_saved_esp = &regs->esp;
+        addr = (unsigned long)(kcb->jprobe_saved_esp);
+
+        /*
+         * TBD: As Linus pointed out, gcc assumes that the callee
+         * owns the argument space and could overwrite it, e.g.
+         * tailcall optimization. So, to be absolutely safe
+         * we also save and restore enough stack bytes to cover
+         * the argument area.
+         */
+        memcpy(kcb->jprobes_stack, (kprobe_opcode_t *)addr,
+                        MIN_STACK_SIZE(addr));
+        regs->eflags &= ~IF_MASK;
+        regs->eip = (unsigned long)(jp->entry);
+        return 1;
+}
+
+void __kprobes jprobe_return(void)
+{
+        struct kprobe_ctlblk *kcb = get_kprobe_ctlblk();
+
+        asm volatile ("       xchgl   %%ebx,%%esp     \n"
+                      "       int3                      \n"
+                      "       .globl jprobe_return_end  \n"
+                      "       jprobe_return_end:        \n"
+                      "       nop                       \n"::"b"
+                      (kcb->jprobe_saved_esp):"memory");
+}
+
+int __kprobes longjmp_break_handler(struct kprobe *p, struct pt_regs *regs)
+{
+        struct kprobe_ctlblk *kcb = get_kprobe_ctlblk();
+        u8 *addr = (u8 *) (regs->eip - 1);
+        unsigned long stack_addr = (unsigned long)(kcb->jprobe_saved_esp);
+        struct jprobe *jp = container_of(p, struct jprobe, kp);
+
+        if ((addr > (u8 *) jprobe_return) && (addr < (u8 *) jprobe_return_end)) {
+                if (&regs->esp != kcb->jprobe_saved_esp) {
+                        struct pt_regs *saved_regs =
+                            container_of(kcb->jprobe_saved_esp,
+                                            struct pt_regs, esp);
+                        printk("current esp %p does not match saved esp %p\n",
+                               &regs->esp, kcb->jprobe_saved_esp);
+                        printk("Saved registers for jprobe %p\n", jp);
+                        show_registers(saved_regs);
+                        printk("Current registers\n");
+                        show_registers(regs);
+                        BUG();
+                }
+                *regs = kcb->jprobe_saved_regs;
+                memcpy((kprobe_opcode_t *) stack_addr, kcb->jprobes_stack,
+                       MIN_STACK_SIZE(stack_addr));
+                preempt_enable_no_resched();
+                return 1;
+        }
+        return 0;
+}
+
+int __kprobes arch_trampoline_kprobe(struct kprobe *p)
+{
+        return 0;
+}
+
+int __init arch_init_kprobes(void)
+{
+        return 0;
+}