s390/kernel/unwind_bc.c

12 unsigned long unwind_get_return_address(struct unwind_state *state)
14 	if (unwind_done(state))
16 	return __kernel_text_address(state->ip) ? state->ip : 0;
20 static bool outside_of_stack(struct unwind_state *state, unsigned long sp)
22 	return (sp <= state->sp) ||
23 		(sp > state->stack_info.end - sizeof(struct stack_frame));
26 static bool update_stack_info(struct unwind_state *state, unsigned long sp)
28 	struct stack_info *info = &state->stack_info;
29 	unsigned long *mask = &state->stack_mask;
32 	if (get_stack_info(sp, state->task, info, mask) != 0 ||
39 static inline bool is_final_pt_regs(struct unwind_state *state,
43 	if (task_pt_regs(state->task) == regs)
47 	return state->stack_info.type == STACK_TYPE_IRQ &&
48 	       state->stack_info.end - sizeof(struct pt_regs) == (unsigned long)regs &&
52 bool unwind_next_frame(struct unwind_state *state)
54 	struct stack_info *info = &state->stack_info;
60 	regs = state->regs;
62 		sp = state->sp;
68 		if (!__kernel_text_address(ip) || state->ip == unwind_recover_ret_addr(state, ip)) {
69 			state->regs = NULL;
70 			return unwind_next_frame(state);
73 		sf = (struct stack_frame *) state->sp;
77 			if (unlikely(outside_of_stack(state, sp))) {
78 				if (!update_stack_info(state, sp))
86 			sp = state->sp + STACK_FRAME_OVERHEAD;
90 			if (is_final_pt_regs(state, regs))
94 			if (unlikely(outside_of_stack(state, sp))) {
95 				if (!update_stack_info(state, sp))
106 	/* Update unwind state */
107 	state->sp = sp;
108 	state->regs = regs;
109 	state->reliable = reliable;
110 	state->ip = unwind_recover_ret_addr(state, ip);
114 	state->error = true;
116 	state->stack_info.type = STACK_TYPE_UNKNOWN;
121 void __unwind_start(struct unwind_state *state, struct task_struct *task,
124 	struct stack_info *info = &state->stack_info;
128 	memset(state, 0, sizeof(*state));
129 	state->task = task;
130 	state->regs = regs;
149 	if (!update_stack_info(state, sp)) {
152 		state->error = true;
162 	/* Update unwind state */
163 	state->sp = sp;
164 	state->reliable = true;
165 	state->ip = unwind_recover_ret_addr(state, ip);
170 	while (!unwind_done(state)) {
171 		if (on_stack(&state->stack_info, first_frame, sizeof(struct stack_frame))) {
172 			if (state->sp >= first_frame)
175 		unwind_next_frame(state);