loongarch/kernel/unwind_prologue.c

93 static inline bool unwind_state_fixup(struct unwind_state *state)
95 	if (!fix_exception(state->pc) && !fix_ftrace(state->pc))
98 	state->reset = true;
110 static bool unwind_by_prologue(struct unwind_state *state)
116 	struct stack_info *info = &state->stack_info;
119 	if (state->sp >= info->end || state->sp < info->begin)
122 	if (state->reset) {
123 		regs = (struct pt_regs *)state->sp;
124 		state->first = true;
125 		state->reset = false;
126 		state->pc = regs->csr_era;
127 		state->ra = regs->regs[1];
128 		state->sp = regs->regs[3];
136 	pc = state->pc - (state->first ? 0 : LOONGARCH_INSN_SIZE);
157 		if (state->first)
175 		if (state->first) {
176 			state->sp = state->sp + frame_size;
182 	state->pc = *(unsigned long *)(state->sp + frame_ra);
183 	state->sp = state->sp + frame_size;
187 	state->pc = state->ra;
190 	state->first = false;
191 	return unwind_state_fixup(state) || __kernel_text_address(state->pc);
194 static bool next_frame(struct unwind_state *state)
198 	struct stack_info *info = &state->stack_info;
200 	if (unwind_done(state))
204 		if (unwind_by_prologue(state)) {
205 			state->pc = unwind_graph_addr(state, state->pc, state->sp);
209 		if (info->type == STACK_TYPE_IRQ && info->end == state->sp) {
216 			state->first = true;
217 			state->pc = pc;
218 			state->ra = regs->regs[1];
219 			state->sp = regs->regs[3];
220 			get_stack_info(state->sp, state->task, info);
225 		state->sp = info->next_sp;
227 	} while (!get_stack_info(state->sp, state->task, info));
230 	state->stack_info.type = STACK_TYPE_UNKNOWN;
234 unsigned long unwind_get_return_address(struct unwind_state *state)
236 	return __unwind_get_return_address(state);
240 void unwind_start(struct unwind_state *state, struct task_struct *task,
243 	__unwind_start(state, task, regs);
244 	state->type = UNWINDER_PROLOGUE;
245 	state->first = true;
252 	if (!__kernel_text_address(state->pc)) {
253 		state->type = UNWINDER_GUESS;
254 		if (!unwind_done(state))
255 			unwind_next_frame(state);
260 bool unwind_next_frame(struct unwind_state *state)
262 	return state->type == UNWINDER_PROLOGUE ?
263 			next_frame(state) : default_next_frame(state);