asmlinkage int syscall_trace(int why, struct pt_regs *regs, int scno)
{
	unsigned long ip;

	if (!test_thread_flag(TIF_SYSCALL_TRACE))
		return scno;
	if (!(current->ptrace & PT_PTRACED))
		return scno;

	/*
	 * Save IP.  IP is used to denote syscall entry/exit:
	 *  IP = 0 -> entry, = 1 -> exit
	 */
	ip = regs->ARM_ip;
	regs->ARM_ip = why;

	current_thread_info()->syscall = scno;

	/* 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;
	}
	regs->ARM_ip = ip;

	return current_thread_info()->syscall;
}

// kernel/fork.c
long do_fork(unsigned long clone_flags,
	      unsigned long stack_start,
	      struct pt_regs *regs,
	      unsigned long stack_size,
	      int __user *parent_tidptr,
	      int __user *child_tidptr)
{
	copy_process(clone_flags, stack_start, regs, stack_size, parent_tidptr, child_tidptr);
	//...
	{//vfork_done
		struct completion vfork;
		if (clone_flags & CLONE_VFORK) {
			p->vfork_done = &vfork;
			init_completion(&vfork);
		}
	}
	//...
	if (clone_flags & CLONE_VFORK) {
		wait_for_completion(&vfork);
		if (unlikely (current->ptrace & PT_TRACE_VFORK_DONE))
			ptrace_notify ((PTRACE_EVENT_VFORK_DONE << 8) | SIGTRAP);
	}	
	//...
	return pid;
}

asmlinkage void syscall_trace(void)
{
	pr_debug("syscall_trace called\n");
	if (!test_thread_flag(TIF_SYSCALL_TRACE))
		return;
	if (!(current->ptrace & PT_PTRACED))
		return;

	pr_debug("syscall_trace: notifying parent\n");
	/* 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) {
		pr_debug("syscall_trace: sending signal %d to PID %u\n",
			 current->exit_code, current->pid);
		send_sig(current->exit_code, current, 1);
		current->exit_code = 0;
	}
}

int setup_signal_stack_si(unsigned long stack_top, int sig,
			  struct k_sigaction *ka, struct pt_regs *regs,
			  siginfo_t *info, sigset_t *mask)
{
	struct rt_sigframe __user *frame;
	void __user *restorer;
	unsigned long save_sp = PT_REGS_SP(regs);
	int err = 0;

	stack_top &= -8UL;
	frame = (struct rt_sigframe __user *) stack_top - 1;
	if (!access_ok(VERIFY_WRITE, frame, sizeof(*frame)))
		return 1;

	restorer = frame->retcode;
	if(ka->sa.sa_flags & SA_RESTORER)
		restorer = ka->sa.sa_restorer;

	/* See comment above about why this is here */
	PT_REGS_SP(regs) = (unsigned long) frame;

	err |= __put_user(restorer, &frame->pretcode);
	err |= __put_user(sig, &frame->sig);
	err |= __put_user(&frame->info, &frame->pinfo);
	err |= __put_user(&frame->uc, &frame->puc);
	err |= copy_siginfo_to_user(&frame->info, info);
	err |= copy_ucontext_to_user(&frame->uc, &frame->fpstate, mask,
				     save_sp);

	/*
	 * This is movl $,%eax ; int $0x80
	 *
	 * WE DO NOT USE IT ANY MORE! It's only left here for historical
	 * reasons and because gdb uses it as a signature to notice
	 * signal handler stack frames.
	 */
	err |= __put_user(0xb8, (char __user *)(frame->retcode+0));
	err |= __put_user(__NR_rt_sigreturn, (int __user *)(frame->retcode+1));
	err |= __put_user(0x80cd, (short __user *)(frame->retcode+5));

	if(err)
		goto err;

	PT_REGS_IP(regs) = (unsigned long) ka->sa.sa_handler;
	PT_REGS_EAX(regs) = (unsigned long) sig;
	PT_REGS_EDX(regs) = (unsigned long) &frame->info;
	PT_REGS_ECX(regs) = (unsigned long) &frame->uc;

	if ((current->ptrace & PT_DTRACE) && (current->ptrace & PT_PTRACED))
		ptrace_notify(SIGTRAP);
	return 0;

err:
	PT_REGS_SP(regs) = save_sp;
	return err;
}

asmlinkage int syscall_trace(int why, struct pt_regs *regs, int scno)
{
	unsigned long ip;
	current_thread_info()->syscall = scno;

	if (why)
		audit_syscall_exit(regs);
	else {
		if (secure_computing(scno) == -1)
			return -1;
		audit_syscall_entry(AUDIT_ARCH_ARM, scno, regs->ARM_r0,
				    regs->ARM_r1, regs->ARM_r2, regs->ARM_r3);
	}

	if (why == 0 && test_and_clear_thread_flag(TIF_SYSCALL_RESTARTSYS))
		scno = __NR_restart_syscall - __NR_SYSCALL_BASE;
	if (!test_thread_flag(TIF_SYSCALL_TRACE))
		return scno;
	if (!(current->ptrace & PT_PTRACED))
		return scno;

	/*
	 * IP is used to denote syscall entry/exit:
	 * IP = 0 -> entry, =1 -> exit
	 */
	ip = regs->ARM_ip;
	regs->ARM_ip = why;

	/*
	 * IP is used to denote syscall entry/exit:
	 * IP = 0 -> entry, =1 -> exit
	 */
	ip = regs->ARM_ip;
	regs->ARM_ip = why;

	/* 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;
	}
	regs->ARM_ip = ip;

	return current_thread_info()->syscall;
}

/*
 * XXX Check PT_DTRACE vs TIF_SINGLESTEP for singlestepping check and
 * PT_PTRACED vs TIF_SYSCALL_TRACE for syscall tracing check
 */
void syscall_trace(struct uml_pt_regs *regs, int entryexit)
{
	int is_singlestep = (current->ptrace & PT_DTRACE) && entryexit;
	int tracesysgood;

	if (unlikely(current->audit_context)) {
		if (!entryexit)
			audit_syscall_entry(HOST_AUDIT_ARCH,
					    UPT_SYSCALL_NR(regs),
					    UPT_SYSCALL_ARG1(regs),
					    UPT_SYSCALL_ARG2(regs),
					    UPT_SYSCALL_ARG3(regs),
					    UPT_SYSCALL_ARG4(regs));
		else audit_syscall_exit(AUDITSC_RESULT(UPT_SYSCALL_RET(regs)),
					UPT_SYSCALL_RET(regs));
	}

	/* Fake a debug trap */
	if (is_singlestep)
		send_sigtrap(current, regs, 0);

	if (!test_thread_flag(TIF_SYSCALL_TRACE))
		return;

	if (!(current->ptrace & PT_PTRACED))
		return;

	/*
	 * the 0x80 provides a way for the tracing parent to distinguish
	 * between a syscall stop and SIGTRAP delivery
	 */
	tracesysgood = (current->ptrace & PT_TRACESYSGOOD);
	ptrace_notify(SIGTRAP | (tracesysgood ? 0x80 : 0));

	if (entryexit) /* force do_signal() --> is_syscall() */
		set_thread_flag(TIF_SIGPENDING);

	/*
	 * 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;
	}
}

static void do_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 void syscall_trace(void)
{
	if (!test_thread_flag(TIF_SYSCALL_TRACE))
		return;
	if (!(current->ptrace & PT_PTRACED))
		return;
	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;
	}
}

static asmlinkage void syscall_trace(void)
{
	if (!test_thread_flag(TIF_SYSCALL_TRACE))
		return;
	if (!(current->ptrace & PT_PTRACED))
		return;
	/* 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;
	}
}

void do_syscall_trace(void)
{
	if (!test_thread_flag(TIF_SYSCALL_TRACE))
		return;
	
	if (!(current->ptrace & PT_PTRACED))
		return;
	
	/* 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.
	 */
	if (current->exit_code) {
		send_sig(current->exit_code, current, 1);
		current->exit_code = 0;
	}
}

/*
 * Notification of system call entry/exit
 * - triggered by current->work.syscall_trace
 */
asmlinkage void do_syscall_trace(struct pt_regs *regs, int entryexit)
{
	/* do the secure computing check first */
	if (!entryexit)
		secure_computing(regs->regs[0]);

	if (unlikely(current->audit_context) && entryexit)
		audit_syscall_exit(AUDITSC_RESULT(regs->regs[2]),
		                   regs->regs[2]);

	if (!(current->ptrace & PT_PTRACED))
		goto out;

	if (!test_thread_flag(TIF_SYSCALL_TRACE))
		goto out;

	/* 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;
	}

out:
	if (unlikely(current->audit_context) && !entryexit)
		audit_syscall_entry(audit_arch(), regs->regs[0],
				    regs->regs[4], regs->regs[5],
				    regs->regs[6], regs->regs[7]);
}

asmlinkage int syscall_trace(int why, struct pt_regs *regs, int scno)
{
	unsigned long ip;

	if (!test_thread_flag(TIF_SYSCALL_TRACE))
		return scno;
	if (!(current->ptrace & PT_PTRACED))
		return scno;

	ip = regs->UCreg_ip;
	regs->UCreg_ip = why;

	current_thread_info()->syscall = scno;

	ptrace_notify(SIGTRAP | ((current->ptrace & PT_TRACESYSGOOD)
				 ? 0x80 : 0));
	if (current->exit_code) {
		send_sig(current->exit_code, current, 1);
		current->exit_code = 0;
	}
	regs->UCreg_ip = ip;

	return current_thread_info()->syscall;
}

void do_syscall_trace(void)
{
	if (!test_thread_flag(TIF_SYSCALL_TRACE))
		return;

	if (!(current->ptrace & PT_PTRACED))
		return;

	/*
                                                                 
                                               
  */
	ptrace_notify(SIGTRAP|((current->ptrace & PT_TRACESYSGOOD) ? 0x80 : 0));

	/*
                                                                   
                                                               
                                         
  */
	if (current->exit_code) {
		send_sig(current->exit_code, current, 1);
		current->exit_code = 0;
	}
}

static int setup_rt_frame(int sig, struct k_sigaction *ka, siginfo_t *info,
			   sigset_t *set, struct pt_regs * regs)
{
	void __user *restorer;
	struct rt_sigframe __user *frame;
	int err = 0;
	int usig;

	frame = get_sigframe(ka, regs, sizeof(*frame));

	if (!access_ok(VERIFY_WRITE, frame, sizeof(*frame)))
		goto give_sigsegv;

	usig = current_thread_info()->exec_domain
		&& current_thread_info()->exec_domain->signal_invmap
		&& sig < 32
		? current_thread_info()->exec_domain->signal_invmap[sig]
		: sig;

	err |= __put_user(usig, &frame->sig);
	err |= __put_user(&frame->info, &frame->pinfo);
	err |= __put_user(&frame->uc, &frame->puc);
	err |= copy_siginfo_to_user(&frame->info, info);
	if (err)
		goto give_sigsegv;

	/* Create the ucontext.  */
	err |= __put_user(0, &frame->uc.uc_flags);
	err |= __put_user(0, &frame->uc.uc_link);
	err |= __put_user(current->sas_ss_sp, &frame->uc.uc_stack.ss_sp);
	err |= __put_user(sas_ss_flags(regs->esp),
			  &frame->uc.uc_stack.ss_flags);
	err |= __put_user(current->sas_ss_size, &frame->uc.uc_stack.ss_size);
	err |= setup_sigcontext(&frame->uc.uc_mcontext, &frame->fpstate,
			        regs, set->sig[0]);
	err |= __copy_to_user(&frame->uc.uc_sigmask, set, sizeof(*set));
	if (err)
		goto give_sigsegv;

	/* Set up to return from userspace.  */
	restorer = (void *)VDSO_SYM(&__kernel_rt_sigreturn);
	if (ka->sa.sa_flags & SA_RESTORER)
		restorer = ka->sa.sa_restorer;
	err |= __put_user(restorer, &frame->pretcode);
	 
	/*
	 * This is movl $,%eax ; int $0x80
	 *
	 * WE DO NOT USE IT ANY MORE! It's only left here for historical
	 * reasons and because gdb uses it as a signature to notice
	 * signal handler stack frames.
	 */
	err |= __put_user(0xb8, (char __user *)(frame->retcode+0));
	err |= __put_user(__NR_rt_sigreturn, (int __user *)(frame->retcode+1));
	err |= __put_user(0x80cd, (short __user *)(frame->retcode+5));

	if (err)
		goto give_sigsegv;

	/* Set up registers for signal handler */
	regs->esp = (unsigned long) frame;
	regs->eip = (unsigned long) ka->sa.sa_handler;
	regs->eax = (unsigned long) usig;
	regs->edx = (unsigned long) &frame->info;
	regs->ecx = (unsigned long) &frame->uc;

	set_fs(USER_DS);
	regs->xds = __USER_DS;
	regs->xes = __USER_DS;
	regs->xss = __USER_DS;
	regs->xcs = __USER_CS;

	/*
	 * Clear TF when entering the signal handler, but
	 * notify any tracer that was single-stepping it.
	 * The tracer may want to single-step inside the
	 * handler too.
	 */
	regs->eflags &= ~TF_MASK;
	if (test_thread_flag(TIF_SINGLESTEP))
		ptrace_notify(SIGTRAP);

#if DEBUG_SIG
	printk("SIG deliver (%s:%d): sp=%p pc=%p ra=%p\n",
		current->comm, current->pid, frame, regs->eip, frame->pretcode);
#endif

	return 0;

give_sigsegv:
	force_sigsegv(sig, current);
	return -EFAULT;
}

static int
handle_signal(unsigned long sig, siginfo_t *info, struct k_sigaction *ka,
          sigset_t *oldset, struct pt_regs *regs)
{
    int ret;

    /* Are we from a system call? */
    if (current_syscall(regs) >= 0) {
        /* If so, check system call restarting.. */
        switch (current_syscall_ret(regs)) {
        case -ERESTART_RESTARTBLOCK:
        case -ERESTARTNOHAND:
            regs->ax = -EINTR;
            break;

        case -ERESTARTSYS:
            if (!(ka->sa.sa_flags & SA_RESTART)) {
                regs->ax = -EINTR;
                break;
            }
        /* fallthrough */
        case -ERESTARTNOINTR:
            regs->ax = regs->orig_ax;
            regs->ip -= 2;
            break;
        }
    }

    /*
     * If TF is set due to a debugger (TIF_FORCED_TF), clear the TF
     * flag so that register information in the sigcontext is correct.
     */
    if (unlikely(regs->flags & X86_EFLAGS_TF) &&
        likely(test_and_clear_thread_flag(TIF_FORCED_TF)))
        regs->flags &= ~X86_EFLAGS_TF;

#ifdef CONFIG_IA32_EMULATION
    if (test_thread_flag(TIF_IA32)) {
        if (ka->sa.sa_flags & SA_SIGINFO)
            ret = ia32_setup_rt_frame(sig, ka, info, oldset, regs);
        else
            ret = ia32_setup_frame(sig, ka, oldset, regs);
    } else 
#endif
    ret = setup_rt_frame(sig, ka, info, oldset, regs);

    if (ret == 0) {
        /*
         * This has nothing to do with segment registers,
         * despite the name.  This magic affects uaccess.h
         * macros' behavior.  Reset it to the normal setting.
         */
        set_fs(USER_DS);

        /*
         * Clear the direction flag as per the ABI for function entry.
         */
        regs->flags &= ~X86_EFLAGS_DF;

        /*
         * Clear TF when entering the signal handler, but
         * notify any tracer that was single-stepping it.
         * The tracer may want to single-step inside the
         * handler too.
         */
        regs->flags &= ~X86_EFLAGS_TF;
        if (test_thread_flag(TIF_SINGLESTEP))
            ptrace_notify(SIGTRAP);

        spin_lock_irq(&current->sighand->siglock);
        sigorsets(&current->blocked,&current->blocked,&ka->sa.sa_mask);
        if (!(ka->sa.sa_flags & SA_NODEFER))
            sigaddset(&current->blocked,sig);
        recalc_sigpending();
        spin_unlock_irq(&current->sighand->siglock);
    }

    return ret;
}

//.........这里部分代码省略.........
	 * - the stack starts at the top and works down
	 */
	stack_size = (stack_size + PAGE_SIZE - 1) & PAGE_MASK;
	if (stack_size < PAGE_SIZE * 2)
		stack_size = PAGE_SIZE * 2;

	down_write(&current->mm->mmap_sem);
	current->mm->start_brk = do_mmap(NULL,
					 0,
					 stack_size,
					 PROT_READ | PROT_WRITE | PROT_EXEC,
					 MAP_PRIVATE | MAP_ANON | MAP_GROWSDOWN,
					 0);

	if (IS_ERR((void *) current->mm->start_brk)) {
		up_write(&current->mm->mmap_sem);
		retval = current->mm->start_brk;
		current->mm->start_brk = 0;
		goto error_kill;
	}

	if (do_mremap(current->mm->start_brk,
		      stack_size,
		      ksize((char *) current->mm->start_brk),
		      0, 0
		      ) == current->mm->start_brk
	    )
		stack_size = ksize((char *) current->mm->start_brk);
	up_write(&current->mm->mmap_sem);

	current->mm->brk = current->mm->start_brk;
	current->mm->context.end_brk = current->mm->start_brk;
	current->mm->context.end_brk += (stack_size > PAGE_SIZE) ? (stack_size - PAGE_SIZE) : 0;
	current->mm->start_stack = current->mm->start_brk + stack_size;
#endif

	compute_creds(bprm);
	current->flags &= ~PF_FORKNOEXEC;
	if (create_elf_fdpic_tables(bprm, current->mm, &exec_params, &interp_params) < 0)
		goto error_kill;

	kdebug("- start_code  %lx",	(long) current->mm->start_code);
	kdebug("- end_code    %lx",	(long) current->mm->end_code);
	kdebug("- start_data  %lx",	(long) current->mm->start_data);
	kdebug("- end_data    %lx",	(long) current->mm->end_data);
	kdebug("- start_brk   %lx",	(long) current->mm->start_brk);
	kdebug("- brk         %lx",	(long) current->mm->brk);
	kdebug("- start_stack %lx",	(long) current->mm->start_stack);

#ifdef ELF_FDPIC_PLAT_INIT
	/*
	 * The ABI may specify that certain registers be set up in special
	 * ways (on i386 %edx is the address of a DT_FINI function, for
	 * example.  This macro performs whatever initialization to
	 * the regs structure is required.
	 */
	ELF_FDPIC_PLAT_INIT(regs,
			    exec_params.map_addr,
			    interp_params.map_addr,
			    interp_params.dynamic_addr ?: exec_params.dynamic_addr
			    );
#endif

	/* everything is now ready... get the userspace context ready to roll */
	start_thread(regs,
		     interp_params.entry_addr ?: exec_params.entry_addr,
		     current->mm->start_stack);

	if (unlikely(current->ptrace & PT_PTRACED)) {
		if (current->ptrace & PT_TRACE_EXEC)
			ptrace_notify ((PTRACE_EVENT_EXEC << 8) | SIGTRAP);
		else
			send_sig(SIGTRAP, current, 0);
	}

	retval = 0;

error:
	if (interpreter) {
		allow_write_access(interpreter);
		fput(interpreter);
	}
	if (interpreter_name)
		kfree(interpreter_name);
	if (exec_params.phdrs)
		kfree(exec_params.phdrs);
	if (exec_params.loadmap)
		kfree(exec_params.loadmap);
	if (interp_params.phdrs)
		kfree(interp_params.phdrs);
	if (interp_params.loadmap)
		kfree(interp_params.loadmap);
	return retval;

	/* unrecoverable error - kill the process */
 error_kill:
	send_sig(SIGSEGV, current, 0);
	goto error;

} /* end load_elf_fdpic_binary() */

static int setup_rt_frame(int sig, struct k_sigaction *ka, siginfo_t *info,
			  sigset_t *set)
{
	struct rt_sigframe __user *frame;
	int rsig;

	set_fs(USER_DS);

	frame = get_sigframe(ka, sizeof(*frame));

	if (!access_ok(VERIFY_WRITE, frame, sizeof(*frame)))
		goto give_sigsegv;

	rsig = sig;
	if (sig < 32 &&
	    __current_thread_info->exec_domain &&
	    __current_thread_info->exec_domain->signal_invmap)
		rsig = __current_thread_info->exec_domain->signal_invmap[sig];

	if (__put_user(rsig,		&frame->sig) ||
	    __put_user(&frame->info,	&frame->pinfo) ||
	    __put_user(&frame->uc,	&frame->puc))
		goto give_sigsegv;

	if (copy_siginfo_to_user(&frame->info, info))
		goto give_sigsegv;

	/* Create the ucontext.  */
	if (__put_user(0, &frame->uc.uc_flags) ||
	    __put_user(NULL, &frame->uc.uc_link) ||
	    __put_user((void __user *)current->sas_ss_sp, &frame->uc.uc_stack.ss_sp) ||
	    __put_user(sas_ss_flags(__frame->sp), &frame->uc.uc_stack.ss_flags) ||
	    __put_user(current->sas_ss_size, &frame->uc.uc_stack.ss_size))
		goto give_sigsegv;

	if (setup_sigcontext(&frame->uc.uc_mcontext, set->sig[0]))
		goto give_sigsegv;

	if (__copy_to_user(&frame->uc.uc_sigmask, set, sizeof(*set)))
		goto give_sigsegv;

	/* Set up to return from userspace.  If provided, use a stub
	 * already in userspace.  */
	if (ka->sa.sa_flags & SA_RESTORER) {
		if (__put_user(ka->sa.sa_restorer, &frame->pretcode))
			goto give_sigsegv;
	}
	else {
		/* Set up the following code on the stack:
		 *	setlos	#__NR_sigreturn,gr7
		 *	tira	gr0,0
		 */
		if (__put_user((__sigrestore_t)frame->retcode, &frame->pretcode) ||
		    __put_user(0x8efc0000|__NR_rt_sigreturn, &frame->retcode[0]) ||
		    __put_user(0xc0700000, &frame->retcode[1]))
			goto give_sigsegv;

		flush_icache_range((unsigned long) frame->retcode,
				   (unsigned long) (frame->retcode + 2));
	}

	/* Set up registers for signal handler */
	if (current->personality & FDPIC_FUNCPTRS) {
		struct fdpic_func_descriptor __user *funcptr =
			(struct fdpic_func_descriptor __user *) ka->sa.sa_handler;
		struct fdpic_func_descriptor desc;
		if (copy_from_user(&desc, funcptr, sizeof(desc)))
			goto give_sigsegv;
		__frame->pc = desc.text;
		__frame->gr15 = desc.GOT;
	} else {
		__frame->pc   = (unsigned long) ka->sa.sa_handler;
		__frame->gr15 = 0;
	}

	__frame->sp  = (unsigned long) frame;
	__frame->lr  = (unsigned long) &frame->retcode;
	__frame->gr8 = sig;
	__frame->gr9 = (unsigned long) &frame->info;

	/* the tracer may want to single-step inside the handler */
	if (test_thread_flag(TIF_SINGLESTEP))
		ptrace_notify(SIGTRAP);

#if DEBUG_SIG
	printk("SIG deliver %d (%s:%d): sp=%p pc=%lx ra=%p\n",
	       sig, current->comm, current->pid, frame, __frame->pc,
	       frame->pretcode);
#endif

	return 0;

give_sigsegv:
	force_sigsegv(sig, current);
	return -EFAULT;

} /* end setup_rt_frame() */

//.........这里部分代码省略.........
    /* Init KThreaad */
    ethread_init(thread, process, current);

    sema_init(&thread->exec_semaphore,0);
    if (is_win32 == TRUE) //parent is a windows process
    {
        down(&thread->exec_semaphore);  //wait for the parent

        child_w32process = process->win32process;
        parent_w32process = parent_eprocess->win32process;
        info = child_w32process->startup_info;

        //now parent has finished its work
        if(thread->inherit_all)
        {
            create_handle_table(parent_eprocess, TRUE, process);
            child_w32process = create_w32process(parent_w32process, TRUE, process);
        }
    }

    deref_object(process);
    deref_object(thread);

    set_teb_selector(current, (long)thread->tcb.teb);

    thread->start_address = (void *)pe_entry;	/* FIXME */

    /* save current trap frame */
    thread->tcb.trap_frame = (struct ktrap_frame *)regs;

    /* init apc, to call LdrInitializeThunk */
#if 0
    thread_apc = kmalloc(sizeof(KAPC), GFP_KERNEL);
    if (!thread_apc) {
        retval = -ENOMEM;
        goto out_free_thread_cid;
    }
    apc_init(thread_apc,
             &thread->tcb,
             OriginalApcEnvironment,
             thread_special_apc,
             NULL,
             (PKNORMAL_ROUTINE)ntdll_entry,
             UserMode,
             (void *)(bprm->p + 12));
    insert_queue_apc(thread_apc, (void *)interp_entry, (void *)extra_page, IO_NO_INCREMENT);
#ifndef TIF_APC
#define	TIF_APC	13
#endif
    set_tsk_thread_flag(current, TIF_APC);
#endif

#ifdef ELF_PLAT_INIT
    /*
     * The ABI may specify that certain registers be set up in special
     * ways (on i386 %edx is the address of a DT_FINI function, for
     * example.  In addition, it may also specify (eg, PowerPC64 ELF)
     * that the e_entry field is the address of the function descriptor
     * for the startup routine, rather than the address of the startup
     * routine itself.  This macro performs whatever initialization to
     * the regs structure is required as well as any relocations to the
     * function descriptor entries when executing dynamically links apps.
     */
    ELF_PLAT_INIT(regs, reloc_func_desc);
#endif

    start_thread(regs, interp_entry, bprm->p);
    if (unlikely(current->ptrace & PT_PTRACED)) {
        if (current->ptrace & PT_TRACE_EXEC)
            ptrace_notify ((PTRACE_EVENT_EXEC << 8) | SIGTRAP);
        else
            send_sig(SIGTRAP, current, 0);
    }

    retval = 0;

    try_module_get(THIS_MODULE);

    /* return from w32syscall_exit, not syscall_exit */
    ((unsigned long *)regs)[-1] = (unsigned long)w32syscall_exit;
    regs->fs = TEB_SELECTOR;

out:
    if(elf_phdata)
        kfree(elf_phdata);
    return retval;

    /* error cleanup */
out_free_thread_cid:
    delete_cid_handle(thread->cid.unique_thread, thread_object_type);
out_free_ethread:
    deref_object(thread);
out_free_process_cid:
    delete_cid_handle(process->unique_processid, process_object_type);
out_free_eproc:
    deref_object(process);
out_free_file:
    send_sig(SIGKILL, current, 0);
    goto out;
}

/*
 * set up a realtime signal frame
 */
static int setup_rt_frame(int sig, struct k_sigaction *ka, siginfo_t *info,
			  sigset_t *set, struct pt_regs *regs)
{
	struct rt_sigframe __user *frame;
	int rsig;

	frame = get_sigframe(ka, regs, sizeof(*frame));

	if (!access_ok(VERIFY_WRITE, frame, sizeof(*frame)))
		goto give_sigsegv;

	rsig = sig;
	if (sig < 32 &&
	    current_thread_info()->exec_domain &&
	    current_thread_info()->exec_domain->signal_invmap)
		rsig = current_thread_info()->exec_domain->signal_invmap[sig];

	if (__put_user(rsig, &frame->sig) ||
	    __put_user(&frame->info, &frame->pinfo) ||
	    __put_user(&frame->uc, &frame->puc) ||
	    copy_siginfo_to_user(&frame->info, info))
		goto give_sigsegv;

	/* create the ucontext.  */
	if (__put_user(0, &frame->uc.uc_flags) ||
	    __put_user(0, &frame->uc.uc_link) ||
	    __put_user((void *)current->sas_ss_sp, &frame->uc.uc_stack.ss_sp) ||
	    __put_user(sas_ss_flags(regs->sp), &frame->uc.uc_stack.ss_flags) ||
	    __put_user(current->sas_ss_size, &frame->uc.uc_stack.ss_size) ||
	    setup_sigcontext(&frame->uc.uc_mcontext,
			     &frame->fpuctx, regs, set->sig[0]) ||
	    __copy_to_user(&frame->uc.uc_sigmask, set, sizeof(*set)))
		goto give_sigsegv;

	/* set up to return from userspace.  If provided, use a stub already in
	 * userspace */
	if (ka->sa.sa_flags & SA_RESTORER) {
		if (__put_user(ka->sa.sa_restorer, &frame->pretcode))
			goto give_sigsegv;
	} else {
		if (__put_user((void(*)(void))frame->retcode,
			       &frame->pretcode) ||
		    /* This is mov $,d0; syscall 0 */
		    __put_user(0x2c, (char *)(frame->retcode + 0)) ||
		    __put_user(__NR_rt_sigreturn,
			       (char *)(frame->retcode + 1)) ||
		    __put_user(0x00, (char *)(frame->retcode + 2)) ||
		    __put_user(0xf0, (char *)(frame->retcode + 3)) ||
		    __put_user(0xe0, (char *)(frame->retcode + 4)))
			goto give_sigsegv;

		flush_icache_range((u_long) frame->retcode,
				   (u_long) frame->retcode + 5);
	}

	/* Set up registers for signal handler */
	regs->sp = (unsigned long) frame;
	regs->pc = (unsigned long) ka->sa.sa_handler;
	regs->d0 = sig;
	regs->d1 = (long) &frame->info;

	/* the tracer may want to single-step inside the handler */
	if (test_thread_flag(TIF_SINGLESTEP))
		ptrace_notify(SIGTRAP);

#if DEBUG_SIG
	printk(KERN_DEBUG "SIG deliver %d (%s:%d): sp=%p pc=%lx ra=%p\n",
	       sig, current->comm, current->pid, frame, regs->pc,
	       frame->pretcode);
#endif

	return 0;

give_sigsegv:
	force_sigsegv(sig, current);
	return -EFAULT;
}

int compat_setup_rt_frame(int sig, struct k_sigaction *ka, siginfo_t *info,
			  sigset_t *set, struct pt_regs *regs)
{
	unsigned long restorer;
	struct compat_rt_sigframe __user *frame;
	int err = 0;
	int usig;

	frame = compat_get_sigframe(ka, regs, sizeof(*frame));

	if (!access_ok(VERIFY_WRITE, frame, sizeof(*frame)))
		goto give_sigsegv;

	usig = current_thread_info()->exec_domain
		&& current_thread_info()->exec_domain->signal_invmap
		&& sig < 32
		? current_thread_info()->exec_domain->signal_invmap[sig]
		: sig;

	
	if (ka->sa.sa_flags & SA_SIGINFO) {
		
		err |= copy_siginfo_to_user32(&frame->info, info);
		regs->flags |= PT_FLAGS_RESTORE_REGS;
	} else {
		err |= __put_user(info->si_signo, &frame->info.si_signo);
	}

	
	err |= __clear_user(&frame->save_area, sizeof(frame->save_area));
	err |= __put_user(0, &frame->uc.uc_flags);
	err |= __put_user(0, &frame->uc.uc_link);
	err |= __put_user(ptr_to_compat((void *)(current->sas_ss_sp)),
			  &frame->uc.uc_stack.ss_sp);
	err |= __put_user(sas_ss_flags(regs->sp),
			  &frame->uc.uc_stack.ss_flags);
	err |= __put_user(current->sas_ss_size, &frame->uc.uc_stack.ss_size);
	err |= setup_sigcontext(&frame->uc.uc_mcontext, regs);
	err |= __copy_to_user(&frame->uc.uc_sigmask, set, sizeof(*set));
	if (err)
		goto give_sigsegv;

	restorer = VDSO_BASE;
	if (ka->sa.sa_flags & SA_RESTORER)
		restorer = ptr_to_compat_reg(ka->sa.sa_restorer);

	regs->pc = ptr_to_compat_reg(ka->sa.sa_handler);
	regs->ex1 = PL_ICS_EX1(USER_PL, 1); 
	regs->sp = ptr_to_compat_reg(frame);
	regs->lr = restorer;
	regs->regs[0] = (unsigned long) usig;
	regs->regs[1] = ptr_to_compat_reg(&frame->info);
	regs->regs[2] = ptr_to_compat_reg(&frame->uc);
	regs->flags |= PT_FLAGS_CALLER_SAVES;

	if (test_thread_flag(TIF_SINGLESTEP))
		ptrace_notify(SIGTRAP);

	return 0;

give_sigsegv:
	signal_fault("bad setup frame", regs, frame, sig);
	return -EFAULT;
}