ftrace.h

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#ifndef _ASM_X86_FTRACE_H
#define _ASM_X86_FTRACE_H

#ifdef __ASSEMBLY__

    /* skip is set if the stack was already partially adjusted */
    .macro MCOUNT_SAVE_FRAME skip=0
     /*
      * We add enough stack to save all regs.
      */
    subq $(SS+8-\skip), %rsp
    movq %rax, RAX(%rsp)
    movq %rcx, RCX(%rsp)
    movq %rdx, RDX(%rsp)
    movq %rsi, RSI(%rsp)
    movq %rdi, RDI(%rsp)
    movq %r8, R8(%rsp)
    movq %r9, R9(%rsp)
     /* Move RIP to its proper location */
    movq SS+8(%rsp), %rdx
    movq %rdx, RIP(%rsp)
    .endm

    .macro MCOUNT_RESTORE_FRAME skip=0
    movq R9(%rsp), %r9
    movq R8(%rsp), %r8
    movq RDI(%rsp), %rdi
    movq RSI(%rsp), %rsi
    movq RDX(%rsp), %rdx
    movq RCX(%rsp), %rcx
    movq RAX(%rsp), %rax
    addq $(SS+8-\skip), %rsp
    .endm

#endif

#ifdef CONFIG_FUNCTION_TRACER
#ifdef CC_USING_FENTRY
# define MCOUNT_ADDR        ((long)(__fentry__))
#else
# define MCOUNT_ADDR        ((long)(mcount))
#endif
#define MCOUNT_INSN_SIZE    5 /* sizeof mcount call */

#ifdef CONFIG_DYNAMIC_FTRACE
#define ARCH_SUPPORTS_FTRACE_OPS 1
#define ARCH_SUPPORTS_FTRACE_SAVE_REGS
#endif

#ifndef __ASSEMBLY__
extern void mcount(void);
extern atomic_t modifying_ftrace_code;
extern void __fentry__(void);

static inline unsigned long ftrace_call_adjust(unsigned long addr)
{
    /*
     * addr is the address of the mcount call instruction.
     * recordmcount does the necessary offset calculation.
     */
    return addr;
}

#ifdef CONFIG_DYNAMIC_FTRACE

struct dyn_arch_ftrace {
    /* No extra data needed for x86 */
};

int ftrace_int3_handler(struct pt_regs *regs);

#endif /*  CONFIG_DYNAMIC_FTRACE */
#endif /* __ASSEMBLY__ */
#endif /* CONFIG_FUNCTION_TRACER */

#endif /* _ASM_X86_FTRACE_H */