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-rw-r--r--arch/s390/kernel/stacktrace.c60
1 files changed, 60 insertions, 0 deletions
diff --git a/arch/s390/kernel/stacktrace.c b/arch/s390/kernel/stacktrace.c
new file mode 100644
index 0000000000..0787010139
--- /dev/null
+++ b/arch/s390/kernel/stacktrace.c
@@ -0,0 +1,60 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * Stack trace management functions
+ *
+ * Copyright IBM Corp. 2006
+ */
+
+#include <linux/stacktrace.h>
+#include <asm/stacktrace.h>
+#include <asm/unwind.h>
+#include <asm/kprobes.h>
+
+void arch_stack_walk(stack_trace_consume_fn consume_entry, void *cookie,
+ struct task_struct *task, struct pt_regs *regs)
+{
+ struct unwind_state state;
+ unsigned long addr;
+
+ unwind_for_each_frame(&state, task, regs, 0) {
+ addr = unwind_get_return_address(&state);
+ if (!addr || !consume_entry(cookie, addr))
+ break;
+ }
+}
+
+int arch_stack_walk_reliable(stack_trace_consume_fn consume_entry,
+ void *cookie, struct task_struct *task)
+{
+ struct unwind_state state;
+ unsigned long addr;
+
+ unwind_for_each_frame(&state, task, NULL, 0) {
+ if (state.stack_info.type != STACK_TYPE_TASK)
+ return -EINVAL;
+
+ if (state.regs)
+ return -EINVAL;
+
+ addr = unwind_get_return_address(&state);
+ if (!addr)
+ return -EINVAL;
+
+#ifdef CONFIG_RETHOOK
+ /*
+ * Mark stacktraces with krethook functions on them
+ * as unreliable.
+ */
+ if (state.ip == (unsigned long)arch_rethook_trampoline)
+ return -EINVAL;
+#endif
+
+ if (!consume_entry(cookie, addr))
+ return -EINVAL;
+ }
+
+ /* Check for stack corruption */
+ if (unwind_error(&state))
+ return -EINVAL;
+ return 0;
+}