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/* SPDX-License-Identifier: GPL-2.0 */
/* Copyright (C) 2017 Andes Technology Corporation */
#include <linux/init.h>
#include <linux/linkage.h>
#include <asm/asm.h>
#include <asm/csr.h>
#include <asm/unistd.h>
#include <asm/thread_info.h>
#include <asm/asm-offsets.h>
#include <asm-generic/export.h>
#include <asm/ftrace.h>
.text
.macro SAVE_ABI_STATE
addi sp, sp, -16
sd s0, 0(sp)
sd ra, 8(sp)
addi s0, sp, 16
.endm
.macro RESTORE_ABI_STATE
ld ra, 8(sp)
ld s0, 0(sp)
addi sp, sp, 16
.endm
ENTRY(ftrace_caller)
/*
* a0: the address in the caller when calling ftrace_caller
* a1: the caller's return address
*/
ld a1, -8(s0)
addi a0, ra, -MCOUNT_INSN_SIZE
SAVE_ABI_STATE
ftrace_call:
.global ftrace_call
/*
* For the dynamic ftrace to work, here we should reserve at least
* 8 bytes for a functional auipc-jalr pair. The following call
* serves this purpose.
*
* Calling ftrace_update_ftrace_func would overwrite the nops below.
* Check ftrace_modify_all_code for details.
*/
call ftrace_stub
RESTORE_ABI_STATE
ret
ENDPROC(ftrace_caller)
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