1 files changed, 129 insertions, 0 deletions
diff --git a/libc/sysdeps/linux/nds32/vfork.S b/libc/sysdeps/linux/nds32/vfork.S
new file mode 100644
index 000000000..ab32135fc
--- /dev/null
+++ b/libc/sysdeps/linux/nds32/vfork.S
@@ -0,0 +1,129 @@
+/*
+ * Copyright (C) 2016-2017 Andes Technology, Inc.
+ * Licensed under the LGPL v2.1, see the file COPYING.LIB in this tarball.
+ */
+
+/* Copyright (C) 1999, 2002, 2003 Free Software Foundation, Inc.
+   Contributed by Philip Blundell <philb@gnu.org>.
+
+   The GNU C Library is free software; you can redistribute it and/or
+   modify it under the terms of the GNU Lesser General Public
+   License as published by the Free Software Foundation; either
+   version 2.1 of the License, or (at your option) any later version.
+
+   The GNU C Library is distributed in the hope that it will be useful,
+   but WITHOUT ANY WARRANTY; without even the implied warranty of
+   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+   Lesser General Public License for more details.
+
+   You should have received a copy of the GNU Lesser General Public
+   License along with the GNU C Library; if not, write to the Free
+   Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
+   02111-1307 USA.  */
+
+#include <sysdep.h>
+#define _ERRNO_H    1
+#include <bits/errno.h>
+
+/* Clone the calling process, but without copying the whole address space.
+   The calling process is suspended until the new process exits or is
+   replaced by a call to `execve'.  Return -1 for errors, 0 to the new process,
+   and the process ID of the new process to the old process.  */
+
+ENTRY (__vfork)
+#ifdef PIC
+.pic
+#endif
+
+#ifdef __NR_vfork
+    syscall __NR_vfork
+    bltz $r0, 2f
+1:
+    ret
+2:
+    sltsi $r1, $r0, -4096
+    bnez $r1, 1b;
+
+# ifdef __ASSUME_VFORK_SYSCALL
+#  ifdef PIC
+	pushm	$gp,	$lp
+	cfi_adjust_cfa_offset(8)
+	cfi_rel_offset(gp, 0)
+	cfi_rel_offset(lp, 4)
+	mfusr 	$r15, 	$PC
+	sethi	$gp,	hi20(_GLOBAL_OFFSET_TABLE_+4)
+	ori	$gp,	$gp,	lo12(_GLOBAL_OFFSET_TABLE_+8)
+	add	$gp,	$gp,	$r15
+
+	! r15=C_SYMBOL_NAME(__syscall_error)@PLT
+	sethi	$r15, 	hi20(C_SYMBOL_NAME(__syscall_error)@PLT)
+	ori	$r15,	$r15, lo12(C_SYMBOL_NAME(__syscall_error)@PLT)
+	add	$r15, 	$r15, 	$gp
+
+	! jump to SYSCALL_ERROR
+	jral		$r15
+	popm	$gp,	$lp
+	cfi_adjust_cfa_offset(-8)
+	cfi_restore(lp)
+	cfi_restore(gp)
+	ret
+#  else
+	j C_SYMBOL_NAME(__syscall_error)
+#  endif
+# else
+    /* Check if vfork syscall is known at all. */
+	li $r1, -ENOSYS
+	beq	$r0, $r1, 1f
+
+# ifdef PIC
+3:
+	pushm	$gp,	$lp
+	cfi_adjust_cfa_offset(8)
+	cfi_rel_offset(gp, 0)
+	cfi_rel_offset(lp, 4)
+	mfusr	$r15,   $PC
+	sethi   $gp,    hi20(_GLOBAL_OFFSET_TABLE_+4)
+	ori     $gp,    $gp,    lo12(_GLOBAL_OFFSET_TABLE_+8)
+	add     $gp,    $gp,    $r15
+
+	! r15=C_SYMBOL_NAME(__syscall_error)@PLT
+	sethi	$r15,	hi20(C_SYMBOL_NAME(__syscall_error)@PLT)
+	ori     $r15,	$r15, lo12(C_SYMBOL_NAME(__syscall_error)@PLT)
+	add     $r15,	$r15, 	$gp
+
+	! jump to SYSCALL_ERROR
+	jral		$r15
+	popm	$gp,	$lp
+	cfi_adjust_cfa_offset(-8)
+	cfi_restore(lp)
+	cfi_restore(gp)
+	ret
+# else
+        j C_SYMBOL_NAME(__syscall_error)
+# endif
+1:
+# endif
+#endif
+
+#ifndef __ASSUME_VFORK_SYSCALL
+    /* If we don't have vfork, fork is close enough. */
+	syscall __NR_fork
+	bgez $r0, 1f
+	sltsi $r1, $r0, -4096
+	bnez	$r1, 1f
+
+# ifdef PIC
+        b       3b
+# else
+        j C_SYMBOL_NAME(__syscall_error)
+# endif
+1:
+    ret
+
+#elif !defined __NR_vfork
+# error "__NR_vfork not available and __ASSUME_VFORK_SYSCALL defined"
+#endif
+
+PSEUDO_END (__vfork)
+weak_alias (__vfork, vfork)
+libc_hidden_def (vfork)