Release 4.18 arch/riscv/include/asm/ftrace.h

/* SPDX-License-Identifier: GPL-2.0 */
/* Copyright (C) 2017 Andes Technology Corporation */

/*
 * The graph frame test is not possible if CONFIG_FRAME_POINTER is not enabled.
 * Check arch/riscv/kernel/mcount.S for detail.
 */
#if defined(CONFIG_FUNCTION_GRAPH_TRACER) && defined(CONFIG_FRAME_POINTER)

#define HAVE_FUNCTION_GRAPH_FP_TEST
#endif

#define HAVE_FUNCTION_GRAPH_RET_ADDR_PTR


#define ARCH_SUPPORTS_FTRACE_OPS 1
#ifndef __ASSEMBLY__
void _mcount(void);


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

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struct dyn_arch_ftrace {
};
#endif

#ifdef CONFIG_DYNAMIC_FTRACE
/*
 * A general call in RISC-V is a pair of insts:
 * 1) auipc: setting high-20 pc-related bits to ra register
 * 2) jalr: setting low-12 offset to ra, jump to ra, and set ra to
 *          return address (original pc + 4)
 *
 * Dynamic ftrace generates probes to call sites, so we must deal with
 * both auipc and jalr at the same time.
 */


#define MCOUNT_ADDR		((unsigned long)_mcount)

#define JALR_SIGN_MASK		(0x00000800)

#define JALR_OFFSET_MASK	(0x00000fff)

#define AUIPC_OFFSET_MASK	(0xfffff000)

#define AUIPC_PAD		(0x00001000)

#define JALR_SHIFT		20

#define JALR_BASIC		(0x000080e7)

#define AUIPC_BASIC		(0x00000097)

#define NOP4			(0x00000013)


#define make_call(caller, callee, call)					\
do {                                                                    \
        call[0] = to_auipc_insn((unsigned int)((unsigned long)callee -  \
                                (unsigned long)caller));                \
        call[1] = to_jalr_insn((unsigned int)((unsigned long)callee -   \
                               (unsigned long)caller));                 \
} while (0)


#define to_jalr_insn(offset)						\
	(((offset & JALR_OFFSET_MASK) << JALR_SHIFT) | JALR_BASIC)


#define to_auipc_insn(offset)						\
	((offset & JALR_SIGN_MASK) ?                                    \
        (((offset & AUIPC_OFFSET_MASK) + AUIPC_PAD) | AUIPC_BASIC) :    \
        ((offset & AUIPC_OFFSET_MASK) | AUIPC_BASIC))

/*
 * Let auipc+jalr be the basic *mcount unit*, so we make it 8 bytes here.
 */

#define MCOUNT_INSN_SIZE 8
#endif
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Directory: arch/riscv/include/asm

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