1 // SPDX-License-Identifier: GPL-2.0-only
24  * The unwind will begin at the PC within the regs.
34 	state->fp = regs->regs[29];  in unwind_init_from_regs()
35 	state->pc = regs->pc;  in unwind_init_from_regs()
51 	state->fp = (unsigned long)__builtin_frame_address(1);  in unwind_init_from_caller()
52 	state->pc = (unsigned long)__builtin_return_address(0);  in unwind_init_from_caller()
58  * The unwind will begin at the blocked tasks saved PC (i.e. the caller of
71 	state->fp = thread_saved_fp(task);  in unwind_init_from_task()
72 	state->pc = thread_saved_pc(task);  in unwind_init_from_task()
79 	if (state->task->ret_stack &&  in unwind_recover_return_address()
80 	    (state->pc == (unsigned long)return_to_handler)) {  in unwind_recover_return_address()
82 		orig_pc = ftrace_graph_ret_addr(state->task, NULL, state->pc,  in unwind_recover_return_address()
83 						(void *)state->fp);  in unwind_recover_return_address()
84 		if (WARN_ON_ONCE(state->pc == orig_pc))  in unwind_recover_return_address()
85 			return -EINVAL;  in unwind_recover_return_address()
86 		state->pc = orig_pc;  in unwind_recover_return_address()
91 	if (is_kretprobe_trampoline(state->pc)) {  in unwind_recover_return_address()
92 		state->pc = kretprobe_find_ret_addr(state->task,  in unwind_recover_return_address()
93 						    (void *)state->fp,  in unwind_recover_return_address()
94 						    &state->kr_cur);  in unwind_recover_return_address()
111 	struct task_struct *tsk = state->task;  in unwind_next()
112 	unsigned long fp = state->fp;  in unwind_next()
116 	if (fp == (unsigned long)task_pt_regs(tsk)->stackframe)  in unwind_next()
117 		return -ENOENT;  in unwind_next()
123 	state->pc = ptrauth_strip_kernel_insn_pac(state->pc);  in unwind_next()
138 		if (!consume_entry(cookie, state->pc))  in unwind()
147  * Per-cpu stacks are only accessible when unwinding the current task in a
148  * non-preemptible context.