9 unsigned long convert_ip_to_linear(struct task_struct *child, struct pt_regs *regs)  in convert_ip_to_linear()  argument
32 		mutex_lock(&child->mm->context.lock);  in convert_ip_to_linear()
33 		if (unlikely((seg >> 3) >= child->mm->context.size))  in convert_ip_to_linear()
36 			desc = child->mm->context.ldt + seg;  in convert_ip_to_linear()
44 		mutex_unlock(&child->mm->context.lock);  in convert_ip_to_linear()
50 static int is_setting_trap_flag(struct task_struct *child, struct pt_regs *regs)  in is_setting_trap_flag()  argument
54 	unsigned long addr = convert_ip_to_linear(child, regs);  in is_setting_trap_flag()
56 	copied = access_process_vm(child, addr, opcode, sizeof(opcode), 0);  in is_setting_trap_flag()
104 static int enable_single_step(struct task_struct *child)  in enable_single_step()  argument
106 	struct pt_regs *regs = task_pt_regs(child);  in enable_single_step()
119 	if (unlikely(test_tsk_thread_flag(child, TIF_SINGLESTEP)))  in enable_single_step()
127 	set_tsk_thread_flag(child, TIF_SINGLESTEP);  in enable_single_step()
143 	if (is_setting_trap_flag(child, regs)) {  in enable_single_step()
144 		clear_tsk_thread_flag(child, TIF_FORCED_TF);  in enable_single_step()
153 		return test_tsk_thread_flag(child, TIF_FORCED_TF);  in enable_single_step()
155 	set_tsk_thread_flag(child, TIF_FORCED_TF);  in enable_single_step()
163 static void enable_step(struct task_struct *child, bool block)  in enable_step()  argument
172 	if (enable_single_step(child) && block) {  in enable_step()
177 		set_tsk_thread_flag(child, TIF_BLOCKSTEP);  in enable_step()
178 	} else if (test_tsk_thread_flag(child, TIF_BLOCKSTEP)) {  in enable_step()
183 		clear_tsk_thread_flag(child, TIF_BLOCKSTEP);  in enable_step()
187 void user_enable_single_step(struct task_struct *child)  in user_enable_single_step()  argument
189 	enable_step(child, 0);  in user_enable_single_step()
192 void user_enable_block_step(struct task_struct *child)  in user_enable_block_step()  argument
194 	enable_step(child, 1);  in user_enable_block_step()
197 void user_disable_single_step(struct task_struct *child)  in user_disable_single_step()  argument
202 	if (test_tsk_thread_flag(child, TIF_BLOCKSTEP)) {  in user_disable_single_step()
207 		clear_tsk_thread_flag(child, TIF_BLOCKSTEP);  in user_disable_single_step()
211 	clear_tsk_thread_flag(child, TIF_SINGLESTEP);  in user_disable_single_step()
214 	if (test_and_clear_tsk_thread_flag(child, TIF_FORCED_TF))  in user_disable_single_step()
215 		task_pt_regs(child)->flags &= ~X86_EFLAGS_TF;  in user_disable_single_step()