disable FB

hc

2024-01-04 1543e317f1da31b75942316931e8f491a8920811

 kernel/arch/arm64/include/asm/ftrace.h
..
..
@@ -1,20 +1,42 @@
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+/* SPDX-License-Identifier: GPL-2.0-only */
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 /*
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  * arch/arm64/include/asm/ftrace.h
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  *
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  * Copyright (C) 2013 Linaro Limited
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  * Author: AKASHI Takahiro <takahiro.akashi@linaro.org>
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- *
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- * This program is free software; you can redistribute it and/or modify
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- * it under the terms of the GNU General Public License version 2 as
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- * published by the Free Software Foundation.
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  */
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 #ifndef __ASM_FTRACE_H
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 #define __ASM_FTRACE_H
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 #include <asm/insn.h>
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12
 
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+#define HAVE_FUNCTION_GRAPH_FP_TEST
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+
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+#ifdef CONFIG_DYNAMIC_FTRACE_WITH_REGS
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+#define ARCH_SUPPORTS_FTRACE_OPS 1
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+#else
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 #define MCOUNT_ADDR		((unsigned long)_mcount)
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+#endif
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+
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+/* The BL at the callsite's adjusted rec->ip */
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 #define MCOUNT_INSN_SIZE	AARCH64_INSN_SIZE
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+
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+#define FTRACE_PLT_IDX		0
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+#define FTRACE_REGS_PLT_IDX	1
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+#define NR_FTRACE_PLTS		2
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+
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+/*
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+ * Currently, gcc tends to save the link register after the local variables
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+ * on the stack. This causes the max stack tracer to report the function
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+ * frame sizes for the wrong functions. By defining
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+ * ARCH_FTRACE_SHIFT_STACK_TRACER, it will tell the stack tracer to expect
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+ * to find the return address on the stack after the local variables have
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+ * been set up.
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+ *
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+ * Note, this may change in the future, and we will need to deal with that
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+ * if it were to happen.
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+ */
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+#define ARCH_FTRACE_SHIFT_STACK_TRACER 1
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 #ifndef __ASSEMBLY__
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 #include <linux/compat.h>
..
..
@@ -33,12 +55,24 @@
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 static inline unsigned long ftrace_call_adjust(unsigned long addr)
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 {
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 	/*
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+	 * Adjust addr to point at the BL in the callsite.
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+	 * See ftrace_init_nop() for the callsite sequence.
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+	 */
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+	if (IS_ENABLED(CONFIG_DYNAMIC_FTRACE_WITH_REGS))
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+		return addr + AARCH64_INSN_SIZE;
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+	/*
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 	 * addr is the address of the mcount call instruction.
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 	 * recordmcount does the necessary offset calculation.
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 	 */
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 	return addr;
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 }
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+#ifdef CONFIG_DYNAMIC_FTRACE_WITH_REGS
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+struct dyn_ftrace;
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+int ftrace_init_nop(struct module *mod, struct dyn_ftrace *rec);
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+#define ftrace_init_nop ftrace_init_nop
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+#endif
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+
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 #define ftrace_return_address(n) return_address(n)
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 /*