1 /* SPDX-License-Identifier: GPL-2.0-only */
28 	unsigned long low;  member
29 	unsigned long high;  member
41  *               longer valid to unwind to.
43  * @prev_fp:     The fp that pointed to this frame record, or a synthetic value
44  *               of 0. This is used to ensure that within a stack, each
47  *               value of STACK_TYPE_UNKNOWN. This is used to detect a
48  *               transition from one stack to another.
72 static inline bool on_stack(unsigned long sp, unsigned long low,  in on_stack()  argument
73 				unsigned long high, enum stack_type type,  in on_stack()  argument
76 	if (!low)  in on_stack()
79 	if (sp < low || sp >= high)  in on_stack()
83 		info->low = low;  in on_stack()
84 		info->high = high;  in on_stack()
85 		info->type = type;  in on_stack()
93 	unsigned long low = (unsigned long)raw_cpu_read(irq_stack_ptr);  in on_irq_stack()  local
94 	unsigned long high = low + IRQ_STACK_SIZE;  in on_irq_stack()  local
96 	return on_stack(sp, low, high, STACK_TYPE_IRQ, info);  in on_irq_stack()
103 	unsigned long low = (unsigned long)task_stack_page(tsk);  in on_task_stack()  local
104 	unsigned long high = low + THREAD_SIZE;  in on_task_stack()  local
106 	return on_stack(sp, low, high, STACK_TYPE_TASK, info);  in on_task_stack()
115 	unsigned long low = (unsigned long)raw_cpu_ptr(overflow_stack);  in on_overflow_stack()  local
116 	unsigned long high = low + OVERFLOW_STACK_SIZE;  in on_overflow_stack()  local
118 	return on_stack(sp, low, high, STACK_TYPE_OVERFLOW, info);  in on_overflow_stack()
127  * We can only safely access per-cpu stacks from current in a non-preemptible
135 		info->type = STACK_TYPE_UNKNOWN;  in on_accessible_stack()
154 	frame->fp = fp;  in start_backtrace()
155 	frame->pc = pc;  in start_backtrace()
157 	frame->graph = 0;  in start_backtrace()
163 	 * In unwind_frame() we'll check that the FP points to a valid stack,  in start_backtrace()
165 	 * treated as a transition to whichever stack that happens to be. The  in start_backtrace()
166 	 * prev_fp value won't be used, but we set it to 0 such that it is  in start_backtrace()
169 	bitmap_zero(frame->stacks_done, __NR_STACK_TYPES);  in start_backtrace()
170 	frame->prev_fp = 0;  in start_backtrace()
171 	frame->prev_type = STACK_TYPE_UNKNOWN;  in start_backtrace()