1 files changed, 0 insertions, 127 deletions
diff --git a/arch/unicore32/kernel/stacktrace.c b/arch/unicore32/kernel/stacktrace.c
deleted file mode 100644
index c9d8650e9d78..000000000000
--- a/arch/unicore32/kernel/stacktrace.c
+++ /dev/null
@@ -1,127 +0,0 @@
-// SPDX-License-Identifier: GPL-2.0-only
-/*
- * linux/arch/unicore32/kernel/stacktrace.c
- *
- * Code specific to PKUnity SoC and UniCore ISA
- *
- * Copyright (C) 2001-2010 GUAN Xue-tao
- */
-#include <linux/module.h>
-#include <linux/sched.h>
-#include <linux/sched/debug.h>
-#include <linux/stacktrace.h>
-
-#include <asm/stacktrace.h>
-
-#if defined(CONFIG_FRAME_POINTER)
-/*
- * Unwind the current stack frame and store the new register values in the
- * structure passed as argument. Unwinding is equivalent to a function return,
- * hence the new PC value rather than LR should be used for backtrace.
- *
- * With framepointer enabled, a simple function prologue looks like this:
- *	mov	ip, sp
- *	stmdb	sp!, {fp, ip, lr, pc}
- *	sub	fp, ip, #4
- *
- * A simple function epilogue looks like this:
- *	ldm	sp, {fp, sp, pc}
- *
- * Note that with framepointer enabled, even the leaf functions have the same
- * prologue and epilogue, therefore we can ignore the LR value in this case.
- */
-int notrace unwind_frame(struct stackframe *frame)
-{
-	unsigned long high, low;
-	unsigned long fp = frame->fp;
-
-	/* only go to a higher address on the stack */
-	low = frame->sp;
-	high = ALIGN(low, THREAD_SIZE);
-
-	/* check current frame pointer is within bounds */
-	if (fp < (low + 12) || fp + 4 >= high)
-		return -EINVAL;
-
-	/* restore the registers from the stack frame */
-	frame->fp = *(unsigned long *)(fp - 12);
-	frame->sp = *(unsigned long *)(fp - 8);
-	frame->pc = *(unsigned long *)(fp - 4);
-
-	return 0;
-}
-#endif
-
-void notrace walk_stackframe(struct stackframe *frame,
-		     int (*fn)(struct stackframe *, void *), void *data)
-{
-	while (1) {
-		int ret;
-
-		if (fn(frame, data))
-			break;
-		ret = unwind_frame(frame);
-		if (ret < 0)
-			break;
-	}
-}
-EXPORT_SYMBOL(walk_stackframe);
-
-#ifdef CONFIG_STACKTRACE
-struct stack_trace_data {
-	struct stack_trace *trace;
-	unsigned int no_sched_functions;
-	unsigned int skip;
-};
-
-static int save_trace(struct stackframe *frame, void *d)
-{
-	struct stack_trace_data *data = d;
-	struct stack_trace *trace = data->trace;
-	unsigned long addr = frame->pc;
-
-	if (data->no_sched_functions && in_sched_functions(addr))
-		return 0;
-	if (data->skip) {
-		data->skip--;
-		return 0;
-	}
-
-	trace->entries[trace->nr_entries++] = addr;
-
-	return trace->nr_entries >= trace->max_entries;
-}
-
-void save_stack_trace_tsk(struct task_struct *tsk, struct stack_trace *trace)
-{
-	struct stack_trace_data data;
-	struct stackframe frame;
-
-	data.trace = trace;
-	data.skip = trace->skip;
-
-	if (tsk != current) {
-		data.no_sched_functions = 1;
-		frame.fp = thread_saved_fp(tsk);
-		frame.sp = thread_saved_sp(tsk);
-		frame.lr = 0;		/* recovered from the stack */
-		frame.pc = thread_saved_pc(tsk);
-	} else {
-		register unsigned long current_sp asm("sp");
-
-		data.no_sched_functions = 0;
-		frame.fp = (unsigned long)__builtin_frame_address(0);
-		frame.sp = current_sp;
-		frame.lr = (unsigned long)__builtin_return_address(0);
-		frame.pc = (unsigned long)save_stack_trace_tsk;
-	}
-
-	walk_stackframe(&frame, save_trace, &data);
-}
-
-void save_stack_trace(struct stack_trace *trace)
-{
-	save_stack_trace_tsk(current, trace);
-}
-EXPORT_SYMBOL_GPL(save_stack_trace);
-#endif