| // 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" |
| ); |
| } |
