mirror of https://gitee.com/openkylin/linux.git
29 lines
787 B
C
29 lines
787 B
C
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// SPDX-License-Identifier: GPL-2.0
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#include <linux/ftrace.h>
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#include <linux/uaccess.h>
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#include <asm/cacheflush.h>
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extern void (*ftrace_trace_function)(unsigned long, unsigned long,
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struct ftrace_ops*, struct pt_regs*);
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noinline void __naked ftrace_stub(unsigned long ip, unsigned long parent_ip,
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struct ftrace_ops *op, struct pt_regs *regs)
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{
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__asm__ (""); /* avoid to optimize as pure function */
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}
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noinline void _mcount(unsigned long parent_ip)
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{
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/* save all state by the compiler prologue */
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unsigned long ip = (unsigned long)__builtin_return_address(0);
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if (ftrace_trace_function != ftrace_stub)
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ftrace_trace_function(ip - MCOUNT_INSN_SIZE, parent_ip,
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NULL, NULL);
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/* restore all state by the compiler epilogue */
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}
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EXPORT_SYMBOL(_mcount);
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