/* * Copyright (C) 2013 Synopsys, Inc. (www.synopsys.com) * * Licensed under the LGPL v2.1 or later, see the file COPYING.LIB in this tarball. */ #include <sys/syscall.h> #include <sysdep.h> /* No legacy syscall ABI means NR_vfork is not available at all, use clone */ #define _SIGNAL_H #include <bits/signum.h> /* For SIGCHLD */ #define CLONE_VM 0x00000100 #define CLONE_VFORK 0x00004000 #define CLONE_FLAGS_FOR_VFORK (CLONE_VM|CLONE_VFORK|SIGCHLD) ENTRY(__vfork) #ifdef SAVE_PID THREAD_SELF r1 ; Get to struct pthread (just before TCB) ld r2, [r1, PTHREAD_PID] neg.f r3, r2 bset.z r3, r3, 31 st r3, [r1, PTHREAD_PID] #endif mov r0, CLONE_FLAGS_FOR_VFORK mov_s r1, sp mov r8, __NR_clone ARC_TRAP_INSN cmp r0, 0 #ifdef RESTORE_PID bz 1f ; child continues THREAD_SELF r1 ; Get to struct pthread (just before TCB) st r2, [r1, PTHREAD_PID] 1: #endif jge [blink] ; pid >=0 return, else detour via tailcall to errno b __syscall_error END(__vfork) weak_alias(__vfork,vfork) libc_hidden_def(vfork)