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-rw-r--r--arch/loongarch/kernel/stacktrace.c41
1 files changed, 41 insertions, 0 deletions
diff --git a/arch/loongarch/kernel/stacktrace.c b/arch/loongarch/kernel/stacktrace.c
index f623feb212..9a038d1070 100644
--- a/arch/loongarch/kernel/stacktrace.c
+++ b/arch/loongarch/kernel/stacktrace.c
@@ -29,6 +29,7 @@ void arch_stack_walk(stack_trace_consume_fn consume_entry, void *cookie,
regs->csr_era = thread_saved_ra(task);
}
regs->regs[1] = 0;
+ regs->regs[22] = 0;
}
for (unwind_start(&state, task, regs);
@@ -39,6 +40,46 @@ void arch_stack_walk(stack_trace_consume_fn consume_entry, void *cookie,
}
}
+int arch_stack_walk_reliable(stack_trace_consume_fn consume_entry,
+ void *cookie, struct task_struct *task)
+{
+ unsigned long addr;
+ struct pt_regs dummyregs;
+ struct pt_regs *regs = &dummyregs;
+ struct unwind_state state;
+
+ if (task == current) {
+ regs->regs[3] = (unsigned long)__builtin_frame_address(0);
+ regs->csr_era = (unsigned long)__builtin_return_address(0);
+ } else {
+ regs->regs[3] = thread_saved_fp(task);
+ regs->csr_era = thread_saved_ra(task);
+ }
+ regs->regs[1] = 0;
+ regs->regs[22] = 0;
+
+ for (unwind_start(&state, task, regs);
+ !unwind_done(&state) && !unwind_error(&state); unwind_next_frame(&state)) {
+ addr = unwind_get_return_address(&state);
+
+ /*
+ * A NULL or invalid return address probably means there's some
+ * generated code which __kernel_text_address() doesn't know about.
+ */
+ if (!addr)
+ return -EINVAL;
+
+ if (!consume_entry(cookie, addr))
+ return -EINVAL;
+ }
+
+ /* Check for stack corruption */
+ if (unwind_error(&state))
+ return -EINVAL;
+
+ return 0;
+}
+
static int
copy_stack_frame(unsigned long fp, struct stack_frame *frame)
{