C++ (Cpp) unprotect_kernel_mem Examples

Example #1

File: trap_user.c Project: 12019/hg556a_source

void sig_handler_common_tt(int sig, void *sc_ptr)
{
	struct sigcontext *sc = sc_ptr;
	struct tt_regs save_regs, *r;
	struct signal_info *info;
	int save_errno = errno, is_user;

	unprotect_kernel_mem();

	r = &TASK_REGS(get_current())->tt;
	save_regs = *r;
	is_user = user_context(SC_SP(sc));
	r->sc = sc;
	if(sig != SIGUSR2) 
		r->syscall = -1;

	change_sig(SIGUSR1, 1);
	info = &sig_info[sig];
	if(!info->is_irq) unblock_signals();

	(*info->handler)(sig, (union uml_pt_regs *) r);

	if(is_user){
		interrupt_end();
		block_signals();
		change_sig(SIGUSR1, 0);
		set_user_mode(NULL);
	}
	*r = save_regs;
	errno = save_errno;
	if(is_user) protect_kernel_mem();
}

Example #2

File: trap_user.c Project: GodFox/magx_kernel_xpixl

void sig_handler_common_tt(int sig, void *sc_ptr)
{
	struct sigcontext *sc = sc_ptr;
	struct tt_regs save_regs, *r;
	struct signal_info *info;
	int save_errno = errno, is_user;

	unprotect_kernel_mem();

	/* This is done because to allow SIGSEGV to be delivered inside a SEGV
	 * handler.  This can happen in copy_user, and if SEGV is disabled,
	 * the process will die.
	 */
	if(sig == SIGSEGV)
		change_sig(SIGSEGV, 1);

	/* This is done because to allow SIGSEGV to be delivered inside a SEGV
	 * handler.  This can happen in copy_user, and if SEGV is disabled,
	 * the process will die.
	 */
	if(sig == SIGSEGV)
		change_sig(SIGSEGV, 1);

	r = &TASK_REGS(get_current())->tt;
	save_regs = *r;
	is_user = user_context(SC_SP(sc));
	r->sc = sc;
	if(sig != SIGUSR2) 
		r->syscall = -1;

	info = &sig_info[sig];
	if(!info->is_irq) unblock_signals();

	(*info->handler)(sig, (union uml_pt_regs *) r);

	if(is_user){
		interrupt_end();
		block_signals();
		set_user_mode(NULL);
	}
	*r = save_regs;
	errno = save_errno;
	if(is_user) protect_kernel_mem();
}