/* SPDX-License-Identifier: GPL-2.0+ */
/*
 * Author: Patrick Stählin <me@packi.ch>
 */
#include <linux/linkage.h>

#include <asm/asm.h>
#include <asm/asm-offsets.h>

	.text
	.altmacro

	.macro save_all_base_regs
	REG_S x1,  PT_RA(sp)
	REG_S x3,  PT_GP(sp)
	REG_S x4,  PT_TP(sp)
	REG_S x5,  PT_T0(sp)
	REG_S x6,  PT_T1(sp)
	REG_S x7,  PT_T2(sp)
	REG_S x8,  PT_S0(sp)
	REG_S x9,  PT_S1(sp)
	REG_S x10, PT_A0(sp)
	REG_S x11, PT_A1(sp)
	REG_S x12, PT_A2(sp)
	REG_S x13, PT_A3(sp)
	REG_S x14, PT_A4(sp)
	REG_S x15, PT_A5(sp)
	REG_S x16, PT_A6(sp)
	REG_S x17, PT_A7(sp)
	REG_S x18, PT_S2(sp)
	REG_S x19, PT_S3(sp)
	REG_S x20, PT_S4(sp)
	REG_S x21, PT_S5(sp)
	REG_S x22, PT_S6(sp)
	REG_S x23, PT_S7(sp)
	REG_S x24, PT_S8(sp)
	REG_S x25, PT_S9(sp)
	REG_S x26, PT_S10(sp)
	REG_S x27, PT_S11(sp)
	REG_S x28, PT_T3(sp)
	REG_S x29, PT_T4(sp)
	REG_S x30, PT_T5(sp)
	REG_S x31, PT_T6(sp)
	.endm

	.macro restore_all_base_regs
	REG_L x3,  PT_GP(sp)
	REG_L x4,  PT_TP(sp)
	REG_L x5,  PT_T0(sp)
	REG_L x6,  PT_T1(sp)
	REG_L x7,  PT_T2(sp)
	REG_L x8,  PT_S0(sp)
	REG_L x9,  PT_S1(sp)
	REG_L x10, PT_A0(sp)
	REG_L x11, PT_A1(sp)
	REG_L x12, PT_A2(sp)
	REG_L x13, PT_A3(sp)
	REG_L x14, PT_A4(sp)
	REG_L x15, PT_A5(sp)
	REG_L x16, PT_A6(sp)
	REG_L x17, PT_A7(sp)
	REG_L x18, PT_S2(sp)
	REG_L x19, PT_S3(sp)
	REG_L x20, PT_S4(sp)
	REG_L x21, PT_S5(sp)
	REG_L x22, PT_S6(sp)
	REG_L x23, PT_S7(sp)
	REG_L x24, PT_S8(sp)
	REG_L x25, PT_S9(sp)
	REG_L x26, PT_S10(sp)
	REG_L x27, PT_S11(sp)
	REG_L x28, PT_T3(sp)
	REG_L x29, PT_T4(sp)
	REG_L x30, PT_T5(sp)
	REG_L x31, PT_T6(sp)
	.endm

ENTRY(__kretprobe_trampoline)
	addi sp, sp, -(PT_SIZE_ON_STACK)
	save_all_base_regs

	move a0, sp /* pt_regs */

	call trampoline_probe_handler

	/* use the result as the return-address */
	move ra, a0

	restore_all_base_regs
	addi sp, sp, PT_SIZE_ON_STACK

	ret
ENDPROC(__kretprobe_trampoline)