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    Subject[PATCH 4/4] FRV: utrace: Implement tracehooks
    Date
    Implement the tracehooks stuff for ptrace on FRV.

    Signed-off-by: David Howells <dhowells@redhat.com>
    ---

    arch/frv/Kconfig | 1
    arch/frv/include/asm/elf.h | 1
    arch/frv/include/asm/ptrace.h | 11 +
    arch/frv/include/asm/syscall.h | 123 +++++++++++++
    arch/frv/kernel/entry.S | 12 +
    arch/frv/kernel/ptrace.c | 378 +++++++++++++++++++++++-----------------
    arch/frv/kernel/signal.c | 5 +
    7 files changed, 367 insertions(+), 164 deletions(-)
    create mode 100644 arch/frv/include/asm/syscall.h


    diff --git a/arch/frv/Kconfig b/arch/frv/Kconfig
    index 9d1552a..8a5bd7a 100644
    --- a/arch/frv/Kconfig
    +++ b/arch/frv/Kconfig
    @@ -6,6 +6,7 @@ config FRV
    bool
    default y
    select HAVE_IDE
    + select HAVE_ARCH_TRACEHOOK

    config ZONE_DMA
    bool
    diff --git a/arch/frv/include/asm/elf.h b/arch/frv/include/asm/elf.h
    index 7279ec0..7bbf6e4 100644
    --- a/arch/frv/include/asm/elf.h
    +++ b/arch/frv/include/asm/elf.h
    @@ -116,6 +116,7 @@ do { \
    } while(0)

    #define USE_ELF_CORE_DUMP
    +#define CORE_DUMP_USE_REGSET
    #define ELF_FDPIC_CORE_EFLAGS EF_FRV_FDPIC
    #define ELF_EXEC_PAGESIZE 16384

    diff --git a/arch/frv/include/asm/ptrace.h b/arch/frv/include/asm/ptrace.h
    index cf69340..5f8b5e4 100644
    --- a/arch/frv/include/asm/ptrace.h
    +++ b/arch/frv/include/asm/ptrace.h
    @@ -65,6 +65,8 @@
    #ifdef __KERNEL__
    #ifndef __ASSEMBLY__

    +struct task_struct;
    +
    /*
    * we dedicate GR28 to keeping a pointer to the current exception frame
    * - gr28 is destroyed on entry to the kernel from userspace
    @@ -73,11 +75,18 @@ register struct pt_regs *__frame asm("gr28");

    #define user_mode(regs) (!((regs)->psr & PSR_S))
    #define instruction_pointer(regs) ((regs)->pc)
    +#define user_stack_pointer(regs) ((regs)->sp)

    extern unsigned long user_stack(const struct pt_regs *);
    extern void show_regs(struct pt_regs *);
    #define profile_pc(regs) ((regs)->pc)
    -#endif
    +
    +#define task_pt_regs(task) (task->thread.frame0)
    +
    +#define arch_has_single_step() (1)
    +extern void user_enable_single_step(struct task_struct *);
    +extern void user_disable_single_step(struct task_struct *);

    #endif /* !__ASSEMBLY__ */
    +#endif /* __KERNEL__ */
    #endif /* _ASM_PTRACE_H */
    diff --git a/arch/frv/include/asm/syscall.h b/arch/frv/include/asm/syscall.h
    new file mode 100644
    index 0000000..a82ede9
    --- /dev/null
    +++ b/arch/frv/include/asm/syscall.h
    @@ -0,0 +1,123 @@
    +/* syscall parameter access functions
    + *
    + * Copyright (C) 2009 Red Hat, Inc. All Rights Reserved.
    + * Written by David Howells (dhowells@redhat.com)
    + *
    + * This program is free software; you can redistribute it and/or
    + * modify it under the terms of the GNU General Public Licence
    + * as published by the Free Software Foundation; either version
    + * 2 of the Licence, or (at your option) any later version.
    + */
    +
    +#ifndef _ASM_SYSCALL_H
    +#define _ASM_SYSCALL_H
    +
    +#include <linux/err.h>
    +#include <asm/ptrace.h>
    +
    +/*
    + * Get the system call number or -1
    + */
    +static inline long syscall_get_nr(struct task_struct *task,
    + struct pt_regs *regs)
    +{
    + return regs->syscallno;
    +}
    +
    +/*
    + * Restore the clobbered GR8 register
    + * (1st syscall arg was overwritten with syscall return or error)
    + */
    +static inline void syscall_rollback(struct task_struct *task,
    + struct pt_regs *regs)
    +{
    + regs->gr8 = regs->orig_gr8;
    +}
    +
    +/*
    + * See if the syscall return value is an error, returning it if it is and 0 if
    + * not
    + */
    +static inline long syscall_get_error(struct task_struct *task,
    + struct pt_regs *regs)
    +{
    + return IS_ERR_VALUE(regs->gr8) ? regs->gr8 : 0;
    +}
    +
    +/*
    + * Get the syscall return value
    + */
    +static inline long syscall_get_return_value(struct task_struct *task,
    + struct pt_regs *regs)
    +{
    + return regs->gr8;
    +}
    +
    +/*
    + * Set the syscall return value
    + */
    +static inline void syscall_set_return_value(struct task_struct *task,
    + struct pt_regs *regs,
    + int error, long val)
    +{
    + if (error)
    + regs->gr8 = -error;
    + else
    + regs->gr8 = val;
    +}
    +
    +/*
    + * Retrieve the system call arguments
    + */
    +static inline void syscall_get_arguments(struct task_struct *task,
    + struct pt_regs *regs,
    + unsigned int i, unsigned int n,
    + unsigned long *args)
    +{
    + /*
    + * Do this simply for now. If we need to start supporting
    + * fetching arguments from arbitrary indices, this will need some
    + * extra logic. Presently there are no in-tree users that depend
    + * on this behaviour.
    + */
    + BUG_ON(i);
    +
    + /* Argument pattern is: GR8, GR9, GR10, GR11, GR12, GR13 */
    + switch (n) {
    + case 6: args[5] = regs->gr13;
    + case 5: args[4] = regs->gr12;
    + case 4: args[3] = regs->gr11;
    + case 3: args[2] = regs->gr10;
    + case 2: args[1] = regs->gr9;
    + case 1: args[0] = regs->gr8;
    + break;
    + default:
    + BUG();
    + }
    +}
    +
    +/*
    + * Alter the system call arguments
    + */
    +static inline void syscall_set_arguments(struct task_struct *task,
    + struct pt_regs *regs,
    + unsigned int i, unsigned int n,
    + const unsigned long *args)
    +{
    + /* Same note as above applies */
    + BUG_ON(i);
    +
    + switch (n) {
    + case 6: regs->gr13 = args[5];
    + case 5: regs->gr12 = args[4];
    + case 4: regs->gr11 = args[3];
    + case 3: regs->gr10 = args[2];
    + case 2: regs->gr9 = args[1];
    + case 1: regs->gr8 = args[0];
    + break;
    + default:
    + BUG();
    + }
    +}
    +
    +#endif /* _ASM_SYSCALL_H */
    diff --git a/arch/frv/kernel/entry.S b/arch/frv/kernel/entry.S
    index 268dfbd..356e0e3 100644
    --- a/arch/frv/kernel/entry.S
    +++ b/arch/frv/kernel/entry.S
    @@ -1149,11 +1149,10 @@ __entry_work_notifysig:
    # perform syscall entry tracing
    __syscall_trace_entry:
    LEDS 0x6320
    - setlos.p #0,gr8
    - call do_syscall_trace
    + call syscall_trace_entry

    - ldi @(gr28,#REG_SYSCALLNO),gr7
    - lddi @(gr28,#REG_GR(8)) ,gr8
    + lddi.p @(gr28,#REG_GR(8)) ,gr8
    + ori gr8,#0,gr7 ; syscall_trace_entry() returned new syscallno
    lddi @(gr28,#REG_GR(10)),gr10
    lddi.p @(gr28,#REG_GR(12)),gr12

    @@ -1168,11 +1167,10 @@ __syscall_exit_work:
    beq icc0,#1,__entry_work_pending

    movsg psr,gr23
    - andi gr23,#~PSR_PIL,gr23 ; could let do_syscall_trace() call schedule()
    + andi gr23,#~PSR_PIL,gr23 ; could let syscall_trace_exit() call schedule()
    movgs gr23,psr

    - setlos.p #1,gr8
    - call do_syscall_trace
    + call syscall_trace_exit
    bra __entry_resume_userspace

    __syscall_badsys:
    diff --git a/arch/frv/kernel/ptrace.c b/arch/frv/kernel/ptrace.c
    index 6b15e5d..e847945 100644
    --- a/arch/frv/kernel/ptrace.c
    +++ b/arch/frv/kernel/ptrace.c
    @@ -19,6 +19,9 @@
    #include <linux/user.h>
    #include <linux/security.h>
    #include <linux/signal.h>
    +#include <linux/regset.h>
    +#include <linux/elf.h>
    +#include <linux/tracehook.h>

    #include <asm/uaccess.h>
    #include <asm/page.h>
    @@ -33,6 +36,169 @@
    */

    /*
    + * retrieve the contents of FRV userspace general registers
    + */
    +static int genregs_get(struct task_struct *target,
    + const struct user_regset *regset,
    + unsigned int pos, unsigned int count,
    + void *kbuf, void __user *ubuf)
    +{
    + const struct user_int_regs *iregs = &target->thread.user->i;
    + int ret;
    +
    + ret = user_regset_copyout(&pos, &count, &kbuf, &ubuf,
    + iregs, 0, sizeof(*iregs));
    + if (ret < 0)
    + return ret;
    +
    + return user_regset_copyout_zero(&pos, &count, &kbuf, &ubuf,
    + sizeof(*iregs), -1);
    +}
    +
    +/*
    + * update the contents of the FRV userspace general registers
    + */
    +static int genregs_set(struct task_struct *target,
    + const struct user_regset *regset,
    + unsigned int pos, unsigned int count,
    + const void *kbuf, const void __user *ubuf)
    +{
    + struct user_int_regs *iregs = &target->thread.user->i;
    + unsigned int offs_gr0, offs_gr1;
    + int ret;
    +
    + /* not allowed to set PSR or __status */
    + if (pos < offsetof(struct user_int_regs, psr) + sizeof(long) &&
    + pos + count > offsetof(struct user_int_regs, psr))
    + return -EIO;
    +
    + if (pos < offsetof(struct user_int_regs, __status) + sizeof(long) &&
    + pos + count > offsetof(struct user_int_regs, __status))
    + return -EIO;
    +
    + /* set the control regs */
    + offs_gr0 = offsetof(struct user_int_regs, gr[0]);
    + offs_gr1 = offsetof(struct user_int_regs, gr[1]);
    + ret = user_regset_copyin(&pos, &count, &kbuf, &ubuf,
    + iregs, 0, offs_gr0);
    + if (ret < 0)
    + return ret;
    +
    + /* skip GR0/TBR */
    + ret = user_regset_copyin_ignore(&pos, &count, &kbuf, &ubuf,
    + offs_gr0, offs_gr1);
    + if (ret < 0)
    + return ret;
    +
    + /* set the general regs */
    + ret = user_regset_copyin(&pos, &count, &kbuf, &ubuf,
    + iregs, offs_gr1, sizeof(*iregs));
    + if (ret < 0)
    + return ret;
    +
    + return user_regset_copyin_ignore(&pos, &count, &kbuf, &ubuf,
    + sizeof(*iregs), -1);
    +}
    +
    +/*
    + * retrieve the contents of FRV userspace FP/Media registers
    + */
    +static int fpmregs_get(struct task_struct *target,
    + const struct user_regset *regset,
    + unsigned int pos, unsigned int count,
    + void *kbuf, void __user *ubuf)
    +{
    + const struct user_fpmedia_regs *fpregs = &target->thread.user->f;
    + int ret;
    +
    + ret = user_regset_copyout(&pos, &count, &kbuf, &ubuf,
    + fpregs, 0, sizeof(*fpregs));
    + if (ret < 0)
    + return ret;
    +
    + return user_regset_copyout_zero(&pos, &count, &kbuf, &ubuf,
    + sizeof(*fpregs), -1);
    +}
    +
    +/*
    + * update the contents of the FRV userspace FP/Media registers
    + */
    +static int fpmregs_set(struct task_struct *target,
    + const struct user_regset *regset,
    + unsigned int pos, unsigned int count,
    + const void *kbuf, const void __user *ubuf)
    +{
    + struct user_fpmedia_regs *fpregs = &target->thread.user->f;
    + int ret;
    +
    + ret = user_regset_copyin(&pos, &count, &kbuf, &ubuf,
    + fpregs, 0, sizeof(*fpregs));
    + if (ret < 0)
    + return ret;
    +
    + return user_regset_copyin_ignore(&pos, &count, &kbuf, &ubuf,
    + sizeof(*fpregs), -1);
    +}
    +
    +/*
    + * determine if the FP/Media registers have actually been used
    + */
    +static int fpmregs_active(struct task_struct *target,
    + const struct user_regset *regset)
    +{
    + return tsk_used_math(target) ? regset->n : 0;
    +}
    +
    +/*
    + * Define the register sets available on the FRV under Linux
    + */
    +enum frv_regset {
    + REGSET_GENERAL,
    + REGSET_FPMEDIA,
    +};
    +
    +static const struct user_regset frv_regsets[] = {
    + /*
    + * General register format is:
    + * PSR, ISR, CCR, CCCR, LR, LCR, PC, (STATUS), SYSCALLNO, ORIG_G8
    + * GNER0-1, IACC0, TBR, GR1-63
    + */
    + [REGSET_GENERAL] = {
    + .core_note_type = NT_PRSTATUS,
    + .n = ELF_NGREG,
    + .size = sizeof(long),
    + .align = sizeof(long),
    + .get = genregs_get,
    + .set = genregs_set,
    + },
    + /*
    + * FPU/Media register format is:
    + * FR0-63, FNER0-1, MSR0-1, ACC0-7, ACCG0-8, FSR
    + */
    + [REGSET_FPMEDIA] = {
    + .core_note_type = NT_PRFPREG,
    + .n = sizeof(struct user_fpmedia_regs) / sizeof(long),
    + .size = sizeof(long),
    + .align = sizeof(long),
    + .get = fpmregs_get,
    + .set = fpmregs_set,
    + .active = fpmregs_active,
    + },
    +};
    +
    +static const struct user_regset_view user_frv_native_view = {
    + .name = "frv",
    + .e_machine = EM_FRV,
    + .regsets = frv_regsets,
    + .n = ARRAY_SIZE(frv_regsets),
    +};
    +
    +const struct user_regset_view *task_user_regset_view(struct task_struct *task)
    +{
    + return &user_frv_native_view;
    +}
    +
    +/*
    * Get contents of register REGNO in task TASK.
    */
    static inline long get_reg(struct task_struct *task, int regno)
    @@ -69,40 +235,23 @@ static inline int put_reg(struct task_struct *task, int regno,
    }

    /*
    - * check that an address falls within the bounds of the target process's memory
    - * mappings
    - */
    -static inline int is_user_addr_valid(struct task_struct *child,
    - unsigned long start, unsigned long len)
    -{
    -#ifdef CONFIG_MMU
    - if (start >= PAGE_OFFSET || len > PAGE_OFFSET - start)
    - return -EIO;
    - return 0;
    -#else
    - struct vm_area_struct *vma;
    -
    - vma = find_vma(child->mm, start);
    - if (vma && start >= vma->vm_start && start + len <= vma->vm_end)
    - return 0;
    -
    - return -EIO;
    -#endif
    -}
    -
    -/*
    * Called by kernel/ptrace.c when detaching..
    *
    * Control h/w single stepping
    */
    -void ptrace_disable(struct task_struct *child)
    +void user_enable_single_step(struct task_struct *child)
    +{
    + child->thread.frame0->__status |= REG__STATUS_STEP;
    +}
    +
    +void user_disable_single_step(struct task_struct *child)
    {
    child->thread.frame0->__status &= ~REG__STATUS_STEP;
    }

    -void ptrace_enable(struct task_struct *child)
    +void ptrace_disable(struct task_struct *child)
    {
    - child->thread.frame0->__status |= REG__STATUS_STEP;
    + user_disable_single_step(child);
    }

    long arch_ptrace(struct task_struct *child, long request, long addr, long data)
    @@ -111,15 +260,6 @@ long arch_ptrace(struct task_struct *child, long request, long addr, long data)
    int ret;

    switch (request) {
    - /* when I and D space are separate, these will need to be fixed. */
    - case PTRACE_PEEKTEXT: /* read word at location addr. */
    - case PTRACE_PEEKDATA:
    - ret = -EIO;
    - if (is_user_addr_valid(child, addr, sizeof(tmp)) < 0)
    - break;
    - ret = generic_ptrace_peekdata(child, addr, data);
    - break;
    -
    /* read the word at location addr in the USER area. */
    case PTRACE_PEEKUSR: {
    tmp = 0;
    @@ -163,15 +303,6 @@ long arch_ptrace(struct task_struct *child, long request, long addr, long data)
    break;
    }

    - /* when I and D space are separate, this will have to be fixed. */
    - case PTRACE_POKETEXT: /* write the word at location addr. */
    - case PTRACE_POKEDATA:
    - ret = -EIO;
    - if (is_user_addr_valid(child, addr, sizeof(tmp)) < 0)
    - break;
    - ret = generic_ptrace_pokedata(child, addr, data);
    - break;
    -
    case PTRACE_POKEUSR: /* write the word at location addr in the USER area */
    ret = -EIO;
    if ((addr & 3) || addr < 0)
    @@ -179,7 +310,7 @@ long arch_ptrace(struct task_struct *child, long request, long addr, long data)

    ret = 0;
    switch (addr >> 2) {
    - case 0 ... PT__END-1:
    + case 0 ... PT__END - 1:
    ret = put_reg(child, addr >> 2, data);
    break;

    @@ -189,95 +320,29 @@ long arch_ptrace(struct task_struct *child, long request, long addr, long data)
    }
    break;

    - case PTRACE_SYSCALL: /* continue and stop at next (return from) syscall */
    - case PTRACE_CONT: /* restart after signal. */
    - ret = -EIO;
    - if (!valid_signal(data))
    - break;
    - if (request == PTRACE_SYSCALL)
    - set_tsk_thread_flag(child, TIF_SYSCALL_TRACE);
    - else
    - clear_tsk_thread_flag(child, TIF_SYSCALL_TRACE);
    - child->exit_code = data;
    - ptrace_disable(child);
    - wake_up_process(child);
    - ret = 0;
    - break;
    -
    - /* make the child exit. Best I can do is send it a sigkill.
    - * perhaps it should be put in the status that it wants to
    - * exit.
    - */
    - case PTRACE_KILL:
    - ret = 0;
    - if (child->exit_state == EXIT_ZOMBIE) /* already dead */
    - break;
    - child->exit_code = SIGKILL;
    - clear_tsk_thread_flag(child, TIF_SINGLESTEP);
    - ptrace_disable(child);
    - wake_up_process(child);
    - break;
    -
    - case PTRACE_SINGLESTEP: /* set the trap flag. */
    - ret = -EIO;
    - if (!valid_signal(data))
    - break;
    - clear_tsk_thread_flag(child, TIF_SYSCALL_TRACE);
    - ptrace_enable(child);
    - child->exit_code = data;
    - wake_up_process(child);
    - ret = 0;
    - break;
    -
    - case PTRACE_DETACH: /* detach a process that was attached. */
    - ret = ptrace_detach(child, data);
    - break;
    -
    - case PTRACE_GETREGS: { /* Get all integer regs from the child. */
    - int i;
    - for (i = 0; i < PT__GPEND; i++) {
    - tmp = get_reg(child, i);
    - if (put_user(tmp, (unsigned long *) data)) {
    - ret = -EFAULT;
    - break;
    - }
    - data += sizeof(long);
    - }
    - ret = 0;
    - break;
    - }
    -
    - case PTRACE_SETREGS: { /* Set all integer regs in the child. */
    - int i;
    - for (i = 0; i < PT__GPEND; i++) {
    - if (get_user(tmp, (unsigned long *) data)) {
    - ret = -EFAULT;
    - break;
    - }
    - put_reg(child, i, tmp);
    - data += sizeof(long);
    - }
    - ret = 0;
    - break;
    - }
    -
    - case PTRACE_GETFPREGS: { /* Get the child FP/Media state. */
    - ret = 0;
    - if (copy_to_user((void *) data,
    - &child->thread.user->f,
    - sizeof(child->thread.user->f)))
    - ret = -EFAULT;
    - break;
    - }
    -
    - case PTRACE_SETFPREGS: { /* Set the child FP/Media state. */
    - ret = 0;
    - if (copy_from_user(&child->thread.user->f,
    - (void *) data,
    - sizeof(child->thread.user->f)))
    - ret = -EFAULT;
    - break;
    - }
    + case PTRACE_GETREGS: /* Get all integer regs from the child. */
    + return copy_regset_to_user(child, &user_frv_native_view,
    + REGSET_GENERAL,
    + 0, sizeof(child->thread.user->i),
    + (void __user *)data);
    +
    + case PTRACE_SETREGS: /* Set all integer regs in the child. */
    + return copy_regset_from_user(child, &user_frv_native_view,
    + REGSET_GENERAL,
    + 0, sizeof(child->thread.user->i),
    + (const void __user *)data);
    +
    + case PTRACE_GETFPREGS: /* Get the child FP/Media state. */
    + return copy_regset_to_user(child, &user_frv_native_view,
    + REGSET_FPMEDIA,
    + 0, sizeof(child->thread.user->f),
    + (void __user *)data);
    +
    + case PTRACE_SETFPREGS: /* Set the child FP/Media state. */
    + return copy_regset_from_user(child, &user_frv_native_view,
    + REGSET_FPMEDIA,
    + 0, sizeof(child->thread.user->f),
    + (const void __user *)data);

    case PTRACE_GETFDPIC:
    tmp = 0;
    @@ -300,35 +365,36 @@ long arch_ptrace(struct task_struct *child, long request, long addr, long data)
    break;

    default:
    - ret = -EIO;
    + ret = ptrace_request(child, request, addr, data);
    break;
    }
    return ret;
    }

    -asmlinkage void do_syscall_trace(int leaving)
    +/*
    + * handle tracing of system call entry
    + * - return the revised system call number or ULONG_MAX to cause ENOSYS
    + */
    +asmlinkage unsigned long syscall_trace_entry(void)
    {
    - if (!test_thread_flag(TIF_SYSCALL_TRACE))
    - return;
    -
    - if (!(current->ptrace & PT_PTRACED))
    - return;
    -
    - /* we need to indicate entry or exit to strace */
    - if (leaving)
    - __frame->__status |= REG__STATUS_SYSC_EXIT;
    - else
    - __frame->__status |= REG__STATUS_SYSC_ENTRY;
    + __frame->__status |= REG__STATUS_SYSC_ENTRY;
    + if (tracehook_report_syscall_entry(__frame)) {
    + /* tracing decided this syscall should not happen, so
    + * We'll return a bogus call number to get an ENOSYS
    + * error, but leave the original number in
    + * __frame->syscallno
    + */
    + return ULONG_MAX;
    + }

    - ptrace_notify(SIGTRAP);
    + return __frame->syscallno;
    +}

    - /*
    - * 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;
    - }
    +/*
    + * handle tracing of system call exit
    + */
    +asmlinkage void syscall_trace_exit(void)
    +{
    + __frame->__status |= REG__STATUS_SYSC_EXIT;
    + tracehook_report_syscall_exit(__frame, 0);
    }
    diff --git a/arch/frv/kernel/signal.c b/arch/frv/kernel/signal.c
    index 7ae290a..4a7a62c 100644
    --- a/arch/frv/kernel/signal.c
    +++ b/arch/frv/kernel/signal.c
    @@ -21,6 +21,7 @@
    #include <linux/unistd.h>
    #include <linux/personality.h>
    #include <linux/freezer.h>
    +#include <linux/tracehook.h>
    #include <asm/ucontext.h>
    #include <asm/uaccess.h>
    #include <asm/cacheflush.h>
    @@ -516,6 +517,9 @@ static void do_signal(void)
    * clear the TIF_RESTORE_SIGMASK flag */
    if (test_thread_flag(TIF_RESTORE_SIGMASK))
    clear_thread_flag(TIF_RESTORE_SIGMASK);
    +
    + tracehook_signal_handler(signr, &info, &ka, __frame,
    + test_thread_flag(TIF_SINGLESTEP));
    }

    return;
    @@ -567,6 +571,7 @@ asmlinkage void do_notify_resume(__u32 thread_info_flags)
    /* deal with notification on about to resume userspace execution */
    if (thread_info_flags & _TIF_NOTIFY_RESUME) {
    clear_thread_flag(TIF_NOTIFY_RESUME);
    + tracehook_notify_resume(__frame);
    }

    } /* end do_notify_resume() */


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