// SPDX-License-Identifier: GPL-2.0+ /* * Part of fork context switch microbenchmark. * * Copyright 2018, Anton Blanchard, IBM Corp. */ #define _GNU_SOURCE#include <sys/syscall.h> void _start(void){	asm volatile (		"li %%r0, %[sys_exit];"		"li %%r3, 0;"		"sc;"		:		: [sys_exit] "i" (SYS_exit)		/*		 * "sc" will clobber r0, r3-r13, cr0, ctr, xer and memory.		 * Even though sys_exit never returns, handle clobber		 * registers.		 */		: "r0", "r3", "r4", "r5", "r6", "r7", "r8", "r9", "r10",		  "r11", "r12", "r13", "cr0", "ctr", "xer", "memory"	);}