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- /*
- * 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)
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