Release 4.14 arch/s390/include/asm/ftrace.h

/* SPDX-License-Identifier: GPL-2.0 */
#ifndef _ASM_S390_FTRACE_H

#define _ASM_S390_FTRACE_H


#define ARCH_SUPPORTS_FTRACE_OPS 1

#ifdef CC_USING_HOTPATCH

#define MCOUNT_INSN_SIZE	6
#else

#define MCOUNT_INSN_SIZE	24

#define MCOUNT_RETURN_FIXUP	18
#endif

#ifndef __ASSEMBLY__


#define ftrace_return_address(n) __builtin_return_address(n)

void _mcount(void);
void ftrace_caller(void);

extern char ftrace_graph_caller_end;
extern unsigned long ftrace_plt;


struct dyn_arch_ftrace { };


#define MCOUNT_ADDR ((unsigned long)_mcount)

#define FTRACE_ADDR ((unsigned long)ftrace_caller)


#define KPROBE_ON_FTRACE_NOP	0

#define KPROBE_ON_FTRACE_CALL	1



static inline unsigned long ftrace_call_adjust(unsigned long addr)
{
	return addr;
}

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struct ftrace_insn {
	
u16 opc;
	
s32 disp;

} __packed;



static inline void ftrace_generate_nop_insn(struct ftrace_insn *insn)
{
#ifdef CONFIG_FUNCTION_TRACER
#ifdef CC_USING_HOTPATCH
	/* brcl 0,0 */
	insn->opc = 0xc004;
	insn->disp = 0;
#else
	/* jg .+24 */
	insn->opc = 0xc0f4;
	insn->disp = MCOUNT_INSN_SIZE / 2;
#endif
#endif
}

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static inline int is_ftrace_nop(struct ftrace_insn *insn)
{
#ifdef CONFIG_FUNCTION_TRACER
#ifdef CC_USING_HOTPATCH
	if (insn->disp == 0)
		return 1;
#else
	if (insn->disp == MCOUNT_INSN_SIZE / 2)
		return 1;
#endif
#endif
	return 0;
}

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static inline void ftrace_generate_call_insn(struct ftrace_insn *insn,
					     unsigned long ip)
{
#ifdef CONFIG_FUNCTION_TRACER
	unsigned long target;

	/* brasl r0,ftrace_caller */
	target = is_module_addr((void *) ip) ? ftrace_plt : FTRACE_ADDR;
	insn->opc = 0xc005;
	insn->disp = (target - ip) / 2;
#endif
}

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#endif /* __ASSEMBLY__ */
#endif /* _ASM_S390_FTRACE_H */
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Directory: arch/s390/include/asm

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