12 unsigned long convert_ip_to_linear(struct task_struct *child, struct pt_regs *regs)  in convert_ip_to_linear()  argument
36 		mutex_lock(&child->mm->context.lock);  in convert_ip_to_linear()
37 		if (unlikely(!child->mm->context.ldt ||  in convert_ip_to_linear()
38 			     seg >= child->mm->context.ldt->nr_entries))  in convert_ip_to_linear()
41 			desc = &child->mm->context.ldt->entries[seg];  in convert_ip_to_linear()
49 		mutex_unlock(&child->mm->context.lock);  in convert_ip_to_linear()
56 static int is_setting_trap_flag(struct task_struct *child, struct pt_regs *regs)  in is_setting_trap_flag()  argument
60 	unsigned long addr = convert_ip_to_linear(child, regs);  in is_setting_trap_flag()
62 	copied = access_process_vm(child, addr, opcode, sizeof(opcode),  in is_setting_trap_flag()
111 static int enable_single_step(struct task_struct *child)  in enable_single_step()  argument
113 	struct pt_regs *regs = task_pt_regs(child);  in enable_single_step()
126 	if (unlikely(test_tsk_thread_flag(child, TIF_SINGLESTEP)))  in enable_single_step()
133 	set_tsk_thread_flag(child, TIF_SINGLESTEP);  in enable_single_step()
139 	set_task_syscall_work(child, SYSCALL_EXIT_TRAP);  in enable_single_step()
155 	if (is_setting_trap_flag(child, regs)) {  in enable_single_step()
156 		clear_tsk_thread_flag(child, TIF_FORCED_TF);  in enable_single_step()
165 		return test_tsk_thread_flag(child, TIF_FORCED_TF);  in enable_single_step()
167 	set_tsk_thread_flag(child, TIF_FORCED_TF);  in enable_single_step()
202 static void enable_step(struct task_struct *child, bool block)  in enable_step()  argument
211 	if (enable_single_step(child) && block)  in enable_step()
212 		set_task_blockstep(child, true);  in enable_step()
213 	else if (test_tsk_thread_flag(child, TIF_BLOCKSTEP))  in enable_step()
214 		set_task_blockstep(child, false);  in enable_step()
217 void user_enable_single_step(struct task_struct *child)  in user_enable_single_step()  argument
219 	enable_step(child, 0);  in user_enable_single_step()
222 void user_enable_block_step(struct task_struct *child)  in user_enable_block_step()  argument
224 	enable_step(child, 1);  in user_enable_block_step()
227 void user_disable_single_step(struct task_struct *child)  in user_disable_single_step()  argument
232 	if (test_tsk_thread_flag(child, TIF_BLOCKSTEP))  in user_disable_single_step()
233 		set_task_blockstep(child, false);  in user_disable_single_step()
236 	clear_tsk_thread_flag(child, TIF_SINGLESTEP);  in user_disable_single_step()
237 	clear_task_syscall_work(child, SYSCALL_EXIT_TRAP);  in user_disable_single_step()
240 	if (test_and_clear_tsk_thread_flag(child, TIF_FORCED_TF))  in user_disable_single_step()
241 		task_pt_regs(child)->flags &= ~X86_EFLAGS_TF;  in user_disable_single_step()