Pull utrace into release branch

11 files changed, 285 insertions, 133 deletions

diff --git a/arch/ia64/Kconfig b/arch/ia64/Kconfig
index 3b7aa38254a8..892f296f99b6 100644
--- a/arch/ia64/Kconfig
+++ b/arch/ia64/Kconfig
@@ -21,6 +21,7 @@ config IA64
         select HAVE_KRETPROBES
         select HAVE_DMA_ATTRS
         select HAVE_KVM
+        select HAVE_ARCH_TRACEHOOK
         default y
         help
           The Itanium Processor Family is Intel's 64-bit successor to
diff --git a/arch/ia64/ia32/ia32_entry.S b/arch/ia64/ia32/ia32_entry.S
index 82a7a0bc5d2e..a8cf19958850 100644
--- a/arch/ia64/ia32/ia32_entry.S
+++ b/arch/ia64/ia32/ia32_entry.S
@@ -108,6 +108,11 @@ GLOBAL_ENTRY(ia32_trace_syscall)
         ;;
         st8 [r2]=r3                             // initialize return code to -ENOSYS
         br.call.sptk.few rp=syscall_trace_enter // give parent a chance to catch syscall args
+        cmp.lt p6,p0=r8,r0                      // check tracehook
+        adds r2=IA64_PT_REGS_R8_OFFSET+16,sp    // r2 = &pt_regs.r8
+        ;;
+(p6)    st8.spill [r2]=r8                       // store return value in slot for r8
+(p6)    br.spnt.few .ret4
 .ret2:  // Need to reload arguments (they may be changed by the tracing process)
         adds r2=IA64_PT_REGS_R1_OFFSET+16,sp    // r2 = &pt_regs.r1
         adds r3=IA64_PT_REGS_R13_OFFSET+16,sp   // r3 = &pt_regs.r13
@@ -199,7 +204,7 @@ ia32_syscall_table:
         data8 sys_setuid        /* 16-bit version */
         data8 sys_getuid        /* 16-bit version */
         data8 compat_sys_stime    /* 25 */
-        data8 sys32_ptrace
+        data8 compat_sys_ptrace
         data8 sys32_alarm
         data8 sys_ni_syscall
         data8 sys_pause
diff --git a/arch/ia64/ia32/sys_ia32.c b/arch/ia64/ia32/sys_ia32.c
index 800a7174a5cb..5e92ae00bdbb 100644
--- a/arch/ia64/ia32/sys_ia32.c
+++ b/arch/ia64/ia32/sys_ia32.c
@@ -1194,25 +1194,6 @@ sys32_waitpid (int pid, unsigned int *stat_addr, int options)
         return compat_sys_wait4(pid, stat_addr, options, NULL);
 }
 
-static unsigned int
-ia32_peek (struct task_struct *child, unsigned long addr, unsigned int *val)
-{
-        size_t copied;
-        unsigned int ret;
-
-        copied = access_process_vm(child, addr, val, sizeof(*val), 0);
-        return (copied != sizeof(ret)) ? -EIO : 0;
-}
-
-static unsigned int
-ia32_poke (struct task_struct *child, unsigned long addr, unsigned int val)
-{
-
-        if (access_process_vm(child, addr, &val, sizeof(val), 1) != sizeof(val))
-                return -EIO;
-        return 0;
-}
-
 /*
  *  The order in which registers are stored in the ptrace regs structure
  */
@@ -1510,49 +1491,15 @@ restore_ia32_fpxstate (struct task_struct *tsk, struct ia32_user_fxsr_struct __u
         return 0;
 }
 
-asmlinkage long
-sys32_ptrace (int request, pid_t pid, unsigned int addr, unsigned int data)
+long compat_arch_ptrace(struct task_struct *child, compat_long_t request,
+        compat_ulong_t caddr, compat_ulong_t cdata)
 {
-        struct task_struct *child;
-        unsigned int value, tmp;
+        unsigned long addr = caddr;
+        unsigned long data = cdata;
+        unsigned int tmp;
         long i, ret;
 
-        lock_kernel();
-        if (request == PTRACE_TRACEME) {
-                ret = ptrace_traceme();
-                goto out;
-        }
-
-        child = ptrace_get_task_struct(pid);
-        if (IS_ERR(child)) {
-                ret = PTR_ERR(child);
-                goto out;
-        }
-
-        if (request == PTRACE_ATTACH) {
-                ret = sys_ptrace(request, pid, addr, data);
-                goto out_tsk;
-        }
-
-        ret = ptrace_check_attach(child, request == PTRACE_KILL);
-        if (ret < 0)
-                goto out_tsk;
-
         switch (request) {
-              case PTRACE_PEEKTEXT:
-              case PTRACE_PEEKDATA:     /* read word at location addr */
-                ret = ia32_peek(child, addr, &value);
-                if (ret == 0)
-                        ret = put_user(value, (unsigned int __user *) compat_ptr(data));
-                else
-                        ret = -EIO;
-                goto out_tsk;
-
-              case PTRACE_POKETEXT:
-              case PTRACE_POKEDATA:     /* write the word at location addr */
-                ret = ia32_poke(child, addr, data);
-                goto out_tsk;
-
               case PTRACE_PEEKUSR:      /* read word at addr in USER area */
                 ret = -EIO;
                 if ((addr & 3) || addr > 17*sizeof(int))
@@ -1617,27 +1564,9 @@ sys32_ptrace (int request, pid_t pid, unsigned int addr, unsigned int data)
                                             compat_ptr(data));
                 break;
 
-              case PTRACE_GETEVENTMSG:   
-                ret = put_user(child->ptrace_message, (unsigned int __user *) compat_ptr(data));
-                break;
-
-              case PTRACE_SYSCALL:      /* continue, stop after next syscall */
-              case PTRACE_CONT:         /* restart after signal. */
-              case PTRACE_KILL:
-              case PTRACE_SINGLESTEP:   /* execute chile for one instruction */
-              case PTRACE_DETACH:       /* detach a process */
-                ret = sys_ptrace(request, pid, addr, data);
-                break;
-
               default:
-                ret = ptrace_request(child, request, addr, data);
-                break;
-
+                return compat_ptrace_request(child, request, caddr, cdata);
         }
-  out_tsk:
-        put_task_struct(child);
-  out:
-        unlock_kernel();
         return ret;
 }
 
diff --git a/arch/ia64/include/asm/ptrace.h b/arch/ia64/include/asm/ptrace.h
index 15f8dcfe6eee..6417c1ecb44e 100644
--- a/arch/ia64/include/asm/ptrace.h
+++ b/arch/ia64/include/asm/ptrace.h
@@ -240,6 +240,12 @@ struct switch_stack {
  */
 # define instruction_pointer(regs) ((regs)->cr_iip + ia64_psr(regs)->ri)
 
+static inline unsigned long user_stack_pointer(struct pt_regs *regs)
+{
+        /* FIXME: should this be bspstore + nr_dirty regs? */
+        return regs->ar_bspstore;
+}
+
 #define regs_return_value(regs) ((regs)->r8)
 
 /* Conserve space in histogram by encoding slot bits in address
@@ -319,6 +325,8 @@ struct switch_stack {
   #define arch_has_block_step()   (1)
   extern void user_enable_block_step(struct task_struct *);
 
+#define __ARCH_WANT_COMPAT_SYS_PTRACE
+
 #endif /* !__KERNEL__ */
 
 /* pt_all_user_regs is used for PTRACE_GETREGS PTRACE_SETREGS */
diff --git a/arch/ia64/include/asm/syscall.h b/arch/ia64/include/asm/syscall.h
new file mode 100644
index 000000000000..2f758a42f94b
--- /dev/null
+++ b/arch/ia64/include/asm/syscall.h
@@ -0,0 +1,163 @@
+/*
+ * Access to user system call parameters and results
+ *
+ * Copyright (C) 2008 Intel Corp.  Shaohua Li <shaohua.li@intel.com>
+ *
+ * This copyrighted material is made available to anyone wishing to use,
+ * modify, copy, or redistribute it subject to the terms and conditions
+ * of the GNU General Public License v.2.
+ *
+ * See asm-generic/syscall.h for descriptions of what we must do here.
+ */
+
+#ifndef _ASM_SYSCALL_H
+#define _ASM_SYSCALL_H  1
+
+#include <linux/sched.h>
+#include <linux/err.h>
+
+static inline long syscall_get_nr(struct task_struct *task,
+                                  struct pt_regs *regs)
+{
+        if ((long)regs->cr_ifs < 0) /* Not a syscall */
+                return -1;
+
+#ifdef CONFIG_IA32_SUPPORT
+        if (IS_IA32_PROCESS(regs))
+                return regs->r1;
+#endif
+
+        return regs->r15;
+}
+
+static inline void syscall_rollback(struct task_struct *task,
+                                    struct pt_regs *regs)
+{
+#ifdef CONFIG_IA32_SUPPORT
+        if (IS_IA32_PROCESS(regs))
+                regs->r8 = regs->r1;
+#endif
+
+        /* do nothing */
+}
+
+static inline long syscall_get_error(struct task_struct *task,
+                                     struct pt_regs *regs)
+{
+#ifdef CONFIG_IA32_SUPPORT
+        if (IS_IA32_PROCESS(regs))
+                return regs->r8;
+#endif
+
+        return regs->r10 == -1 ? regs->r8:0;
+}
+
+static inline long syscall_get_return_value(struct task_struct *task,
+                                            struct pt_regs *regs)
+{
+        return regs->r8;
+}
+
+static inline void syscall_set_return_value(struct task_struct *task,
+                                            struct pt_regs *regs,
+                                            int error, long val)
+{
+#ifdef CONFIG_IA32_SUPPORT
+        if (IS_IA32_PROCESS(regs)) {
+                regs->r8 = (long) error ? error : val;
+                return;
+        }
+#endif
+
+        if (error) {
+                /* error < 0, but ia64 uses > 0 return value */
+                regs->r8 = -error;
+                regs->r10 = -1;
+        } else {
+                regs->r8 = val;
+                regs->r10 = 0;
+        }
+}
+
+extern void ia64_syscall_get_set_arguments(struct task_struct *task,
+        struct pt_regs *regs, unsigned int i, unsigned int n,
+        unsigned long *args, int rw);
+static inline void syscall_get_arguments(struct task_struct *task,
+                                         struct pt_regs *regs,
+                                         unsigned int i, unsigned int n,
+                                         unsigned long *args)
+{
+        BUG_ON(i + n > 6);
+
+#ifdef CONFIG_IA32_SUPPORT
+        if (IS_IA32_PROCESS(regs)) {
+                switch (i + n) {
+                case 6:
+                        if (!n--) break;
+                        *args++ = regs->r13;
+                case 5:
+                        if (!n--) break;
+                        *args++ = regs->r15;
+                case 4:
+                        if (!n--) break;
+                        *args++ = regs->r14;
+                case 3:
+                        if (!n--) break;
+                        *args++ = regs->r10;
+                case 2:
+                        if (!n--) break;
+                        *args++ = regs->r9;
+                case 1:
+                        if (!n--) break;
+                        *args++ = regs->r11;
+                case 0:
+                        if (!n--) break;
+                default:
+                        BUG();
+                        break;
+                }
+
+                return;
+        }
+#endif
+        ia64_syscall_get_set_arguments(task, regs, i, n, args, 0);
+}
+
+static inline void syscall_set_arguments(struct task_struct *task,
+                                         struct pt_regs *regs,
+                                         unsigned int i, unsigned int n,
+                                         unsigned long *args)
+{
+        BUG_ON(i + n > 6);
+
+#ifdef CONFIG_IA32_SUPPORT
+        if (IS_IA32_PROCESS(regs)) {
+                switch (i + n) {
+                case 6:
+                        if (!n--) break;
+                        regs->r13 = *args++;
+                case 5:
+                        if (!n--) break;
+                        regs->r15 = *args++;
+                case 4:
+                        if (!n--) break;
+                        regs->r14 = *args++;
+                case 3:
+                        if (!n--) break;
+                        regs->r10 = *args++;
+                case 2:
+                        if (!n--) break;
+                        regs->r9 = *args++;
+                case 1:
+                        if (!n--) break;
+                        regs->r11 = *args++;
+                case 0:
+                        if (!n--) break;
+                }
+
+                return;
+        }
+#endif
+        ia64_syscall_get_set_arguments(task, regs, i, n, args, 1);
+}
+#endif  /* _ASM_SYSCALL_H */
diff --git a/arch/ia64/include/asm/thread_info.h b/arch/ia64/include/asm/thread_info.h
index 7c60fcdd2efd..ae6922626bf4 100644
--- a/arch/ia64/include/asm/thread_info.h
+++ b/arch/ia64/include/asm/thread_info.h
@@ -87,9 +87,6 @@ struct thread_info {
 #define alloc_task_struct()     ((struct task_struct *)__get_free_pages(GFP_KERNEL | __GFP_COMP, KERNEL_STACK_SIZE_ORDER))
 #define free_task_struct(tsk)   free_pages((unsigned long) (tsk), KERNEL_STACK_SIZE_ORDER)
 
-#define tsk_set_notify_resume(tsk) \
-        set_ti_thread_flag(task_thread_info(tsk), TIF_NOTIFY_RESUME)
-extern void tsk_clear_notify_resume(struct task_struct *tsk);
 #endif /* !__ASSEMBLY */
 
 /*
diff --git a/arch/ia64/kernel/entry.S b/arch/ia64/kernel/entry.S
index 0dd6c1419d8d..7ef0c594f5ed 100644
--- a/arch/ia64/kernel/entry.S
+++ b/arch/ia64/kernel/entry.S
@@ -534,6 +534,11 @@ GLOBAL_ENTRY(ia64_trace_syscall)
         stf.spill [r16]=f10
         stf.spill [r17]=f11
         br.call.sptk.many rp=syscall_trace_enter // give parent a chance to catch syscall args
+        cmp.lt p6,p0=r8,r0                      // check tracehook
+        adds r2=PT(R8)+16,sp                    // r2 = &pt_regs.r8
+        adds r3=PT(R10)+16,sp                   // r3 = &pt_regs.r10
+        mov r10=0
+(p6)    br.cond.sptk strace_error               // syscall failed ->
         adds r16=PT(F6)+16,sp
         adds r17=PT(F7)+16,sp
         ;;
diff --git a/arch/ia64/kernel/perfmon.c b/arch/ia64/kernel/perfmon.c
index fc8f3509df27..ada4605d1223 100644
--- a/arch/ia64/kernel/perfmon.c
+++ b/arch/ia64/kernel/perfmon.c
@@ -40,6 +40,7 @@
 #include <linux/capability.h>
 #include <linux/rcupdate.h>
 #include <linux/completion.h>
+#include <linux/tracehook.h>
 
 #include <asm/errno.h>
 #include <asm/intrinsics.h>
@@ -3684,7 +3685,7 @@ pfm_restart(pfm_context_t *ctx, void *arg, int count, struct pt_regs *regs)
 
                 PFM_SET_WORK_PENDING(task, 1);
 
-                tsk_set_notify_resume(task);
+                set_notify_resume(task);
 
                 /*
                  * XXX: send reschedule if task runs on another CPU
@@ -5044,8 +5045,6 @@ pfm_handle_work(void)
 
         PFM_SET_WORK_PENDING(current, 0);
 
-        tsk_clear_notify_resume(current);
-
         regs = task_pt_regs(current);
 
         /*
@@ -5414,7 +5413,7 @@ pfm_overflow_handler(struct task_struct *task, pfm_context_t *ctx, u64 pmc0, str
                          * when coming from ctxsw, current still points to the
                          * previous task, therefore we must work with task and not current.
                          */
-                        tsk_set_notify_resume(task);
+                        set_notify_resume(task);
                 }
                 /*
                  * defer until state is changed (shorten spin window). the context is locked
diff --git a/arch/ia64/kernel/process.c b/arch/ia64/kernel/process.c
index 3ab8373103ec..341a0319a5ba 100644
--- a/arch/ia64/kernel/process.c
+++ b/arch/ia64/kernel/process.c
@@ -28,6 +28,7 @@
 #include <linux/delay.h>
 #include <linux/kdebug.h>
 #include <linux/utsname.h>
+#include <linux/tracehook.h>
 
 #include <asm/cpu.h>
 #include <asm/delay.h>
@@ -160,21 +161,6 @@ show_regs (struct pt_regs *regs)
                 show_stack(NULL, NULL);
 }
 
-void tsk_clear_notify_resume(struct task_struct *tsk)
-{
-#ifdef CONFIG_PERFMON
-        if (tsk->thread.pfm_needs_checking)
-                return;
-#endif
-        if (test_ti_thread_flag(task_thread_info(tsk), TIF_RESTORE_RSE))
-                return;
-        clear_ti_thread_flag(task_thread_info(tsk), TIF_NOTIFY_RESUME);
-}
-
-/*
- * do_notify_resume_user():
- *      Called from notify_resume_user at entry.S, with interrupts disabled.
- */
 void
 do_notify_resume_user(sigset_t *unused, struct sigscratch *scr, long in_syscall)
 {
@@ -203,6 +189,11 @@ do_notify_resume_user(sigset_t *unused, struct sigscratch *scr, long in_syscall)
                 ia64_do_signal(scr, in_syscall);
         }
 
+        if (test_thread_flag(TIF_NOTIFY_RESUME)) {
+                clear_thread_flag(TIF_NOTIFY_RESUME);
+                tracehook_notify_resume(&scr->pt);
+        }
+
         /* copy user rbs to kernel rbs */
         if (unlikely(test_thread_flag(TIF_RESTORE_RSE))) {
                 local_irq_enable();     /* force interrupt enable */
diff --git a/arch/ia64/kernel/ptrace.c b/arch/ia64/kernel/ptrace.c
index 2a9943b5947f..92c9689b7d97 100644
--- a/arch/ia64/kernel/ptrace.c
+++ b/arch/ia64/kernel/ptrace.c
@@ -22,6 +22,7 @@
 #include <linux/signal.h>
 #include <linux/regset.h>
 #include <linux/elf.h>
+#include <linux/tracehook.h>
 
 #include <asm/pgtable.h>
 #include <asm/processor.h>
@@ -603,7 +604,7 @@ void ia64_ptrace_stop(void)
 {
         if (test_and_set_tsk_thread_flag(current, TIF_RESTORE_RSE))
                 return;
-        tsk_set_notify_resume(current);
+        set_notify_resume(current);
         unw_init_running(do_sync_rbs, ia64_sync_user_rbs);
 }
 
@@ -613,7 +614,6 @@ void ia64_ptrace_stop(void)
 void ia64_sync_krbs(void)
 {
         clear_tsk_thread_flag(current, TIF_RESTORE_RSE);
-        tsk_clear_notify_resume(current);
 
         unw_init_running(do_sync_rbs, ia64_sync_kernel_rbs);
 }
@@ -644,7 +644,7 @@ ptrace_attach_sync_user_rbs (struct task_struct *child)
                 spin_lock_irq(&child->sighand->siglock);
                 if (child->state == TASK_STOPPED &&
                     !test_and_set_tsk_thread_flag(child, TIF_RESTORE_RSE)) {
-                        tsk_set_notify_resume(child);
+                        set_notify_resume(child);
 
                         child->state = TASK_TRACED;
                         stopped = 1;
@@ -1232,37 +1232,16 @@ arch_ptrace (struct task_struct *child, long request, long addr, long data)
 }
 
 
-static void
-syscall_trace (void)
-{
-        /*
-         * The 0x80 provides a way for the tracing parent to
-         * distinguish between a syscall stop and SIGTRAP delivery.
-         */
-        ptrace_notify(SIGTRAP
-                      | ((current->ptrace & PT_TRACESYSGOOD) ? 0x80 : 0));
-
-        /*
-         * This isn't the same as continuing with a signal, but it
-         * will do for normal use.  strace only continues with a
-         * signal if the stopping signal is not SIGTRAP.  -brl
-         */
-        if (current->exit_code) {
-                send_sig(current->exit_code, current, 1);
-                current->exit_code = 0;
-        }
-}
-
 /* "asmlinkage" so the input arguments are preserved... */
 
-asmlinkage void
+asmlinkage long
 syscall_trace_enter (long arg0, long arg1, long arg2, long arg3,
                      long arg4, long arg5, long arg6, long arg7,
                      struct pt_regs regs)
 {
-        if (test_thread_flag(TIF_SYSCALL_TRACE) 
-            && (current->ptrace & PT_PTRACED))
-                syscall_trace();
+        if (test_thread_flag(TIF_SYSCALL_TRACE))
+                if (tracehook_report_syscall_entry(&regs))
+                        return -ENOSYS;
 
         /* copy user rbs to kernel rbs */
         if (test_thread_flag(TIF_RESTORE_RSE))
@@ -1283,6 +1262,7 @@ syscall_trace_enter (long arg0, long arg1, long arg2, long arg3,
                 audit_syscall_entry(arch, syscall, arg0, arg1, arg2, arg3);
         }
 
+        return 0;
 }
 
 /* "asmlinkage" so the input arguments are preserved... */
@@ -1292,6 +1272,8 @@ syscall_trace_leave (long arg0, long arg1, long arg2, long arg3,
                      long arg4, long arg5, long arg6, long arg7,
                      struct pt_regs regs)
 {
+        int step;
+
         if (unlikely(current->audit_context)) {
                 int success = AUDITSC_RESULT(regs.r10);
                 long result = regs.r8;
@@ -1301,10 +1283,9 @@ syscall_trace_leave (long arg0, long arg1, long arg2, long arg3,
                 audit_syscall_exit(success, result);
         }
 
-        if ((test_thread_flag(TIF_SYSCALL_TRACE)
-            || test_thread_flag(TIF_SINGLESTEP))
-            && (current->ptrace & PT_PTRACED))
-                syscall_trace();
+        step = test_thread_flag(TIF_SINGLESTEP);
+        if (step || test_thread_flag(TIF_SYSCALL_TRACE))
+                tracehook_report_syscall_exit(&regs, step);
 
         /* copy user rbs to kernel rbs */
         if (test_thread_flag(TIF_RESTORE_RSE))
@@ -1940,7 +1921,7 @@ gpregs_writeback(struct task_struct *target,
 {
         if (test_and_set_tsk_thread_flag(target, TIF_RESTORE_RSE))
                 return 0;
-        tsk_set_notify_resume(target);
+        set_notify_resume(target);
         return do_regset_call(do_gpregs_writeback, target, regset, 0, 0,
                 NULL, NULL);
 }
@@ -2199,3 +2180,68 @@ const struct user_regset_view *task_user_regset_view(struct task_struct *tsk)
 #endif
         return &user_ia64_view;
 }
+
+struct syscall_get_set_args {
+        unsigned int i;
+        unsigned int n;
+        unsigned long *args;
+        struct pt_regs *regs;
+        int rw;
+};
+
+static void syscall_get_set_args_cb(struct unw_frame_info *info, void *data)
+{
+        struct syscall_get_set_args *args = data;
+        struct pt_regs *pt = args->regs;
+        unsigned long *krbs, cfm, ndirty;
+        int i, count;
+
+        if (unw_unwind_to_user(info) < 0)
+                return;
+
+        cfm = pt->cr_ifs;
+        krbs = (unsigned long *)info->task + IA64_RBS_OFFSET/8;
+        ndirty = ia64_rse_num_regs(krbs, krbs + (pt->loadrs >> 19));
+
+        count = 0;
+        if (in_syscall(pt))
+                count = min_t(int, args->n, cfm & 0x7f);
+
+        for (i = 0; i < count; i++) {
+                if (args->rw)
+                        *ia64_rse_skip_regs(krbs, ndirty + i + args->i) =
+                                args->args[i];
+                else
+                        args->args[i] = *ia64_rse_skip_regs(krbs,
+                                ndirty + i + args->i);
+        }
+
+        if (!args->rw) {
+                while (i < args->n) {
+                        args->args[i] = 0;
+                        i++;
+                }
+        }
+}
+
+void ia64_syscall_get_set_arguments(struct task_struct *task,
+        struct pt_regs *regs, unsigned int i, unsigned int n,
+        unsigned long *args, int rw)
+{
+        struct syscall_get_set_args data = {
+                .i = i,
+                .n = n,
+                .args = args,
+                .regs = regs,
+                .rw = rw,
+        };
+
+        if (task == current)
+                unw_init_running(syscall_get_set_args_cb, &data);
+        else {
+                struct unw_frame_info ufi;
+                memset(&ufi, 0, sizeof(ufi));
+                unw_init_from_blocked_task(&ufi, task);
+                syscall_get_set_args_cb(&ufi, &data);
+        }
+}
diff --git a/arch/ia64/kernel/signal.c b/arch/ia64/kernel/signal.c
index 19c5a78636fc..e12500a9c443 100644
--- a/arch/ia64/kernel/signal.c
+++ b/arch/ia64/kernel/signal.c
@@ -11,6 +11,7 @@
 #include <linux/kernel.h>
 #include <linux/mm.h>
 #include <linux/ptrace.h>
+#include <linux/tracehook.h>
 #include <linux/sched.h>
 #include <linux/signal.h>
 #include <linux/smp.h>
@@ -439,6 +440,13 @@ handle_signal (unsigned long sig, struct k_sigaction *ka, siginfo_t *info, sigse
                 sigaddset(&current->blocked, sig);
         recalc_sigpending();
         spin_unlock_irq(&current->sighand->siglock);
+
+        /*
+         * Let tracing know that we've done the handler setup.
+         */
+        tracehook_signal_handler(sig, info, ka, &scr->pt,
+                                 test_thread_flag(TIF_SINGLESTEP));
+
         return 1;
 }