sh: Add kprobes support.
authorChris Smith <chris.smith@st.com>
Fri, 5 Sep 2008 08:15:39 +0000 (17:15 +0900)
committerPaul Mundt <lethal@linux-sh.org>
Mon, 8 Sep 2008 01:35:05 +0000 (10:35 +0900)
Initial support for kprobes/kretprobes for 32-bit SH platforms.

[ General cleanup and some rework for the kretprobe hash lock. -- PFM ]

Signed-off-by: Chris Smith <chris.smith@st.com>
Signed-off-by: Paul Mundt <lethal@linux-sh.org>
arch/sh/Kconfig
arch/sh/include/asm/kprobes.h [new file with mode: 0644]
arch/sh/kernel/Makefile_32
arch/sh/kernel/kprobes.c [new file with mode: 0644]
arch/sh/kernel/traps_32.c

index af2b174fd7d9c7b1310fb40dfc304e9e76e144dc..334917a62ecf725d929ceb5f672b4b54fffa5325 100644 (file)
@@ -20,6 +20,8 @@ config SUPERH
 
 config SUPERH32
        def_bool !SUPERH64
+       select HAVE_KPROBES
+       select HAVE_KRETPROBES
 
 config SUPERH64
        def_bool y if CPU_SH5
diff --git a/arch/sh/include/asm/kprobes.h b/arch/sh/include/asm/kprobes.h
new file mode 100644 (file)
index 0000000..70fc629
--- /dev/null
@@ -0,0 +1,59 @@
+#ifndef __ASM_SH_KPROBES_H
+#define __ASM_SH_KPROBES_H
+
+#ifdef CONFIG_KPROBES
+
+#include <linux/types.h>
+#include <linux/ptrace.h>
+
+struct pt_regs;
+
+typedef u16 kprobe_opcode_t;
+#define BREAKPOINT_INSTRUCTION 0xc3ff
+
+#define MAX_INSN_SIZE 16
+#define MAX_STACK_SIZE 64
+#define MIN_STACK_SIZE(ADDR) (((MAX_STACK_SIZE) < \
+       (((unsigned long)current_thread_info()) + THREAD_SIZE - (ADDR))) \
+       ? (MAX_STACK_SIZE) \
+       : (((unsigned long)current_thread_info()) + THREAD_SIZE - (ADDR)))
+
+#define regs_return_value(regs)                ((regs)->regs[0])
+#define flush_insn_slot(p)             do { } while (0)
+#define kretprobe_blacklist_size       0
+
+struct kprobe;
+
+void arch_remove_kprobe(struct kprobe *);
+void kretprobe_trampoline(void);
+void jprobe_return_end(void);
+
+/* Architecture specific copy of original instruction*/
+struct arch_specific_insn {
+       /* copy of the original instruction */
+       kprobe_opcode_t insn[MAX_INSN_SIZE];
+};
+
+struct prev_kprobe {
+       struct kprobe *kp;
+       unsigned long status;
+};
+
+/* per-cpu kprobe control block */
+struct kprobe_ctlblk {
+       unsigned long kprobe_status;
+       unsigned long jprobe_saved_r15;
+       struct pt_regs jprobe_saved_regs;
+       kprobe_opcode_t jprobes_stack[MAX_STACK_SIZE];
+       struct prev_kprobe prev_kprobe;
+};
+
+extern int kprobe_exceptions_notify(struct notifier_block *self,
+                                   unsigned long val, void *data);
+extern int kprobe_handle_illslot(unsigned long pc);
+#else
+
+#define kprobe_handle_illslot(pc)      (-1)
+
+#endif /* CONFIG_KPROBES */
+#endif /* __ASM_SH_KPROBES_H */
index 0e6905fe9fec80b54198ba4f7fd1561fac284a65..12e617beba209fe01100e16151229928016dd37c 100644 (file)
@@ -23,5 +23,6 @@ obj-$(CONFIG_PM)              += pm.o
 obj-$(CONFIG_STACKTRACE)       += stacktrace.o
 obj-$(CONFIG_ELF_CORE)         += dump_task.o
 obj-$(CONFIG_IO_TRAPPED)       += io_trapped.o
+obj-$(CONFIG_KPROBES)          += kprobes.o
 
 EXTRA_CFLAGS += -Werror
diff --git a/arch/sh/kernel/kprobes.c b/arch/sh/kernel/kprobes.c
new file mode 100644 (file)
index 0000000..c4f4a09
--- /dev/null
@@ -0,0 +1,568 @@
+/*
+ * Kernel probes (kprobes) for SuperH
+ *
+ * Copyright (C) 2007 Chris Smith <chris.smith@st.com>
+ * Copyright (C) 2006 Lineo Solutions, Inc.
+ *
+ * This file is subject to the terms and conditions of the GNU General Public
+ * License.  See the file "COPYING" in the main directory of this archive
+ * for more details.
+ */
+#include <linux/kprobes.h>
+#include <linux/module.h>
+#include <linux/ptrace.h>
+#include <linux/preempt.h>
+#include <linux/kdebug.h>
+#include <asm/cacheflush.h>
+#include <asm/uaccess.h>
+
+DEFINE_PER_CPU(struct kprobe *, current_kprobe) = NULL;
+DEFINE_PER_CPU(struct kprobe_ctlblk, kprobe_ctlblk);
+
+static struct kprobe saved_current_opcode;
+static struct kprobe saved_next_opcode;
+static struct kprobe saved_next_opcode2;
+
+#define OPCODE_JMP(x)  (((x) & 0xF0FF) == 0x402b)
+#define OPCODE_JSR(x)  (((x) & 0xF0FF) == 0x400b)
+#define OPCODE_BRA(x)  (((x) & 0xF000) == 0xa000)
+#define OPCODE_BRAF(x) (((x) & 0xF0FF) == 0x0023)
+#define OPCODE_BSR(x)  (((x) & 0xF000) == 0xb000)
+#define OPCODE_BSRF(x) (((x) & 0xF0FF) == 0x0003)
+
+#define OPCODE_BF_S(x) (((x) & 0xFF00) == 0x8f00)
+#define OPCODE_BT_S(x) (((x) & 0xFF00) == 0x8d00)
+
+#define OPCODE_BF(x)   (((x) & 0xFF00) == 0x8b00)
+#define OPCODE_BT(x)   (((x) & 0xFF00) == 0x8900)
+
+#define OPCODE_RTS(x)  (((x) & 0x000F) == 0x000b)
+#define OPCODE_RTE(x)  (((x) & 0xFFFF) == 0x002b)
+
+int __kprobes arch_prepare_kprobe(struct kprobe *p)
+{
+       kprobe_opcode_t opcode = *(kprobe_opcode_t *) (p->addr);
+
+       if (OPCODE_RTE(opcode))
+               return -EFAULT; /* Bad breakpoint */
+
+       p->opcode = opcode;
+
+       return 0;
+}
+
+void __kprobes arch_copy_kprobe(struct kprobe *p)
+{
+       memcpy(p->ainsn.insn, p->addr, MAX_INSN_SIZE * sizeof(kprobe_opcode_t));
+       p->opcode = *p->addr;
+}
+
+void __kprobes arch_arm_kprobe(struct kprobe *p)
+{
+       *p->addr = BREAKPOINT_INSTRUCTION;
+       flush_icache_range((unsigned long)p->addr,
+                          (unsigned long)p->addr + sizeof(kprobe_opcode_t));
+}
+
+void __kprobes arch_disarm_kprobe(struct kprobe *p)
+{
+       *p->addr = p->opcode;
+       flush_icache_range((unsigned long)p->addr,
+                          (unsigned long)p->addr + sizeof(kprobe_opcode_t));
+}
+
+int __kprobes arch_trampoline_kprobe(struct kprobe *p)
+{
+       if (*p->addr == BREAKPOINT_INSTRUCTION)
+               return 1;
+
+       return 0;
+}
+
+/**
+ * If an illegal slot instruction exception occurs for an address
+ * containing a kprobe, remove the probe.
+ *
+ * Returns 0 if the exception was handled successfully, 1 otherwise.
+ */
+int __kprobes kprobe_handle_illslot(unsigned long pc)
+{
+       struct kprobe *p = get_kprobe((kprobe_opcode_t *) pc + 1);
+
+       if (p != NULL) {
+               printk("Warning: removing kprobe from delay slot: 0x%.8x\n",
+                      (unsigned int)pc + 2);
+               unregister_kprobe(p);
+               return 0;
+       }
+
+       return 1;
+}
+
+void __kprobes arch_remove_kprobe(struct kprobe *p)
+{
+       if (saved_next_opcode.addr != 0x0) {
+               arch_disarm_kprobe(p);
+               arch_disarm_kprobe(&saved_next_opcode);
+               saved_next_opcode.addr = 0x0;
+               saved_next_opcode.opcode = 0x0;
+
+               if (saved_next_opcode2.addr != 0x0) {
+                       arch_disarm_kprobe(&saved_next_opcode2);
+                       saved_next_opcode2.addr = 0x0;
+                       saved_next_opcode2.opcode = 0x0;
+               }
+       }
+}
+
+static inline void save_previous_kprobe(struct kprobe_ctlblk *kcb)
+{
+       kcb->prev_kprobe.kp = kprobe_running();
+       kcb->prev_kprobe.status = kcb->kprobe_status;
+}
+
+static inline void restore_previous_kprobe(struct kprobe_ctlblk *kcb)
+{
+       __get_cpu_var(current_kprobe) = kcb->prev_kprobe.kp;
+       kcb->kprobe_status = kcb->prev_kprobe.status;
+}
+
+static inline void set_current_kprobe(struct kprobe *p, struct pt_regs *regs,
+                                     struct kprobe_ctlblk *kcb)
+{
+       __get_cpu_var(current_kprobe) = p;
+}
+
+/*
+ * Singlestep is implemented by disabling the current kprobe and setting one
+ * on the next instruction, following branches. Two probes are set if the
+ * branch is conditional.
+ */
+static inline void prepare_singlestep(struct kprobe *p, struct pt_regs *regs)
+{
+       kprobe_opcode_t *addr = NULL;
+       saved_current_opcode.addr = (kprobe_opcode_t *) (regs->pc);
+       addr = saved_current_opcode.addr;
+
+       if (p != NULL) {
+               arch_disarm_kprobe(p);
+
+               if (OPCODE_JSR(p->opcode) || OPCODE_JMP(p->opcode)) {
+                       unsigned int reg_nr = ((p->opcode >> 8) & 0x000F);
+                       saved_next_opcode.addr =
+                           (kprobe_opcode_t *) regs->regs[reg_nr];
+               } else if (OPCODE_BRA(p->opcode) || OPCODE_BSR(p->opcode)) {
+                       unsigned long disp = (p->opcode & 0x0FFF);
+                       saved_next_opcode.addr =
+                           (kprobe_opcode_t *) (regs->pc + 4 + disp * 2);
+
+               } else if (OPCODE_BRAF(p->opcode) || OPCODE_BSRF(p->opcode)) {
+                       unsigned int reg_nr = ((p->opcode >> 8) & 0x000F);
+                       saved_next_opcode.addr =
+                           (kprobe_opcode_t *) (regs->pc + 4 +
+                                                regs->regs[reg_nr]);
+
+               } else if (OPCODE_RTS(p->opcode)) {
+                       saved_next_opcode.addr = (kprobe_opcode_t *) regs->pr;
+
+               } else if (OPCODE_BF(p->opcode) || OPCODE_BT(p->opcode)) {
+                       unsigned long disp = (p->opcode & 0x00FF);
+                       /* case 1 */
+                       saved_next_opcode.addr = p->addr + 1;
+                       /* case 2 */
+                       saved_next_opcode2.addr =
+                           (kprobe_opcode_t *) (regs->pc + 4 + disp * 2);
+                       saved_next_opcode2.opcode = *(saved_next_opcode2.addr);
+                       arch_arm_kprobe(&saved_next_opcode2);
+
+               } else if (OPCODE_BF_S(p->opcode) || OPCODE_BT_S(p->opcode)) {
+                       unsigned long disp = (p->opcode & 0x00FF);
+                       /* case 1 */
+                       saved_next_opcode.addr = p->addr + 2;
+                       /* case 2 */
+                       saved_next_opcode2.addr =
+                           (kprobe_opcode_t *) (regs->pc + 4 + disp * 2);
+                       saved_next_opcode2.opcode = *(saved_next_opcode2.addr);
+                       arch_arm_kprobe(&saved_next_opcode2);
+
+               } else {
+                       saved_next_opcode.addr = p->addr + 1;
+               }
+
+               saved_next_opcode.opcode = *(saved_next_opcode.addr);
+               arch_arm_kprobe(&saved_next_opcode);
+       }
+}
+
+/* Called with kretprobe_lock held */
+void __kprobes arch_prepare_kretprobe(struct kretprobe_instance *ri,
+                                     struct pt_regs *regs)
+{
+       ri->ret_addr = (kprobe_opcode_t *) regs->pr;
+
+       /* Replace the return addr with trampoline addr */
+       regs->pr = (unsigned long)kretprobe_trampoline;
+}
+
+static int __kprobes kprobe_handler(struct pt_regs *regs)
+{
+       struct kprobe *p;
+       int ret = 0;
+       kprobe_opcode_t *addr = NULL;
+       struct kprobe_ctlblk *kcb;
+
+       /*
+        * We don't want to be preempted for the entire
+        * duration of kprobe processing
+        */
+       preempt_disable();
+       kcb = get_kprobe_ctlblk();
+
+       addr = (kprobe_opcode_t *) (regs->pc);
+
+       /* 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) {
+                               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 {
+                       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) {
+               /* 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:
+       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 kretprobe_trampoline_holder(void)
+{
+       asm volatile ("kretprobe_trampoline: \n" "nop\n");
+}
+
+/*
+ * Called when we hit the probe point at kretprobe_trampoline
+ */
+int __kprobes trampoline_probe_handler(struct kprobe *p, 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);
+       kretprobe_hash_lock(current, &head, &flags);
+
+       /*
+        * 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;
+                       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);
+
+       regs->pc = orig_ret_address;
+       kretprobe_hash_unlock(current, &flags);
+
+       preempt_enable_no_resched();
+
+       hlist_for_each_entry_safe(ri, node, tmp, &empty_rp, hlist) {
+               hlist_del(&ri->hlist);
+               kfree(ri);
+       }
+
+       return orig_ret_address;
+}
+
+static inline int post_kprobe_handler(struct pt_regs *regs)
+{
+       struct kprobe *cur = kprobe_running();
+       struct kprobe_ctlblk *kcb = get_kprobe_ctlblk();
+       kprobe_opcode_t *addr = NULL;
+       struct kprobe *p = NULL;
+
+       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);
+       }
+
+       if (saved_next_opcode.addr != 0x0) {
+               arch_disarm_kprobe(&saved_next_opcode);
+               saved_next_opcode.addr = 0x0;
+               saved_next_opcode.opcode = 0x0;
+
+               addr = saved_current_opcode.addr;
+               saved_current_opcode.addr = 0x0;
+
+               p = get_kprobe(addr);
+               arch_arm_kprobe(p);
+
+               if (saved_next_opcode2.addr != 0x0) {
+                       arch_disarm_kprobe(&saved_next_opcode2);
+                       saved_next_opcode2.addr = 0x0;
+                       saved_next_opcode2.opcode = 0x0;
+               }
+       }
+
+       /*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();
+
+       return 1;
+}
+
+static inline int kprobe_fault_handler(struct pt_regs *regs, int trapnr)
+{
+       struct kprobe *cur = kprobe_running();
+       struct kprobe_ctlblk *kcb = get_kprobe_ctlblk();
+       const struct exception_table_entry *entry;
+
+       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, point the pc back to the probe address
+                * and allow the page fault handler to continue as a
+                * normal page fault.
+                */
+               regs->pc = (unsigned long)cur->addr;
+               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 accounting
+                * 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 ((entry = search_exception_tables(regs->pc)) != NULL) {
+                       regs->pc = entry->fixup;
+                       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 kprobe *p = NULL;
+       struct die_args *args = (struct die_args *)data;
+       int ret = NOTIFY_DONE;
+       kprobe_opcode_t *addr = NULL;
+       struct kprobe_ctlblk *kcb = get_kprobe_ctlblk();
+
+       addr = (kprobe_opcode_t *) (args->regs->pc);
+       if (val == DIE_TRAP) {
+               if (!kprobe_running()) {
+                       if (kprobe_handler(args->regs)) {
+                               ret = NOTIFY_STOP;
+                       } else {
+                               /* Not a kprobe trap */
+                               force_sig(SIGTRAP, current);
+                       }
+               } else {
+                       p = get_kprobe(addr);
+                       if ((kcb->kprobe_status == KPROBE_HIT_SS) ||
+                           (kcb->kprobe_status == KPROBE_REENTER)) {
+                               if (post_kprobe_handler(args->regs))
+                                       ret = NOTIFY_STOP;
+                       } else {
+                               if (kprobe_handler(args->regs)) {
+                                       ret = NOTIFY_STOP;
+                               } else {
+                                       p = __get_cpu_var(current_kprobe);
+                                       if (p->break_handler
+                                           && p->break_handler(p, args->regs))
+                                               ret = NOTIFY_STOP;
+                               }
+                       }
+               }
+       }
+
+       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_r15 = regs->regs[15];
+       addr = kcb->jprobe_saved_r15;
+
+       /*
+        * 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->pc = (unsigned long)(jp->entry);
+
+       return 1;
+}
+
+void __kprobes jprobe_return(void)
+{
+       __asm("trapa #-1\n\t" "jprobe_return_end:\n\t" "nop\n\t");
+
+}
+
+int __kprobes longjmp_break_handler(struct kprobe *p, struct pt_regs *regs)
+{
+       struct kprobe_ctlblk *kcb = get_kprobe_ctlblk();
+       u8 *addr = (u8 *) regs->pc;
+       unsigned long stack_addr = kcb->jprobe_saved_r15;
+
+       if ((addr >= (u8 *) jprobe_return)
+           && (addr <= (u8 *) jprobe_return_end)) {
+               *regs = kcb->jprobe_saved_regs;
+
+               memcpy((kprobe_opcode_t *) stack_addr, kcb->jprobes_stack,
+                      MIN_STACK_SIZE(stack_addr));
+
+               kcb->kprobe_status = KPROBE_HIT_SS;
+               return 1;
+       }
+       return 0;
+}
+
+static struct kprobe trampoline_p = {
+       .addr = (kprobe_opcode_t *) &kretprobe_trampoline,
+       .pre_handler = trampoline_probe_handler
+};
+
+int __init arch_init_kprobes(void)
+{
+       saved_next_opcode.addr = 0x0;
+       saved_next_opcode.opcode = 0x0;
+
+       saved_current_opcode.addr = 0x0;
+       saved_current_opcode.opcode = 0x0;
+
+       saved_next_opcode2.addr = 0x0;
+       saved_next_opcode2.opcode = 0x0;
+
+       return register_kprobe(&trampoline_p);
+}
index 4901f673216210b5b5f26bf39fa7604a1c16377d..862667a341fd4e7a85b92da76f16e6a49307a3b3 100644 (file)
@@ -26,6 +26,7 @@
 #include <asm/system.h>
 #include <asm/uaccess.h>
 #include <asm/fpu.h>
+#include <asm/kprobes.h>
 
 #ifdef CONFIG_SH_KGDB
 #include <asm/kgdb.h>
@@ -743,6 +744,10 @@ asmlinkage void do_illegal_slot_inst(unsigned long r4, unsigned long r5,
        struct pt_regs *regs = RELOC_HIDE(&__regs, 0);
        unsigned long error_code;
        struct task_struct *tsk = current;
+
+       if (kprobe_handle_illslot(regs->pc) == 0)
+               return;
+
 #ifdef CONFIG_SH_FPU_EMU
        unsigned short inst = 0;