LoongArch: Strip guess unwinder out from prologue unwinder

[linux-2.6-microblaze.git] / arch / loongarch / kernel / unwind_guess.c

diff --git a/arch/loongarch/kernel/unwind_guess.c b/arch/loongarch/kernel/unwind_guess.c
index e2d2e4f..98379b7 100644 (file)
--- a/arch/loongarch/kernel/unwind_guess.c
+++ b/arch/loongarch/kernel/unwind_guess.c
@@ -2,37 +2,18 @@
 /*
  * Copyright (C) 2022 Loongson Technology Corporation Limited
  */
-#include <linux/kernel.h>
-#include <linux/ftrace.h>
-
 #include <asm/unwind.h>
 
 unsigned long unwind_get_return_address(struct unwind_state *state)
 {
-       if (unwind_done(state))
-               return 0;
-       else if (state->first)
-               return state->pc;
-
-       return *(unsigned long *)(state->sp);
+       return __unwind_get_return_address(state);
 }
 EXPORT_SYMBOL_GPL(unwind_get_return_address);
 
 void unwind_start(struct unwind_state *state, struct task_struct *task,
                    struct pt_regs *regs)
 {
-       memset(state, 0, sizeof(*state));
-
-       if (regs) {
-               state->sp = regs->regs[3];
-               state->pc = regs->csr_era;
-       }
-
-       state->task = task;
-       state->first = true;
-
-       get_stack_info(state->sp, state->task, &state->stack_info);
-
+       __unwind_start(state, task, regs);
        if (!unwind_done(state) && !__kernel_text_address(state->pc))
                unwind_next_frame(state);
 }
@@ -40,30 +21,6 @@ EXPORT_SYMBOL_GPL(unwind_start);
 
 bool unwind_next_frame(struct unwind_state *state)
 {
-       struct stack_info *info = &state->stack_info;
-       unsigned long addr;
-
-       if (unwind_done(state))
-               return false;
-
-       if (state->first)
-               state->first = false;
-
-       do {
-               for (state->sp += sizeof(unsigned long);
-                    state->sp < info->end;
-                    state->sp += sizeof(unsigned long)) {
-                       addr = *(unsigned long *)(state->sp);
-                       state->pc = ftrace_graph_ret_addr(state->task, &state->graph_idx,
-                                       addr, (unsigned long *)(state->sp - GRAPH_FAKE_OFFSET));
-                       if (__kernel_text_address(addr))
-                               return true;
-               }
-
-               state->sp = info->next_sp;
-
-       } while (!get_stack_info(state->sp, state->task, info));
-
-       return false;
+       return default_next_frame(state);
 }
 EXPORT_SYMBOL_GPL(unwind_next_frame);