summaryrefslogtreecommitdiff
path: root/libc/sysdeps/linux/nds32/vfork.S
diff options
context:
space:
mode:
authorWaldemar Brodkorb <wbx@openadk.org>2016-04-21 01:25:29 +0200
committerWaldemar Brodkorb <wbx@uclibc-ng.org>2016-06-30 03:24:42 +0200
commitee92c0fe5c1b9d59508273916e2c9a75b68dbc13 (patch)
tree65a22258b12f84325910fc2ad47e2b02696ef593 /libc/sysdeps/linux/nds32/vfork.S
parentdd46699e46decb7273f44dc2cbf307f096dc39e8 (diff)
nds32: add support for new architecture
Add support for Andes Technology NDS32 architecture. See here http://www.andestech.com/en/index/index.htm for more informaton. Verification of the port from an older uClibc port was done on a sponsored AG101p board. The testsuite only has 5 errors, three are related to an existing bug in dlclose() with LT.old, also happening on cris32 and m68k. Failures to fallocate/posix_fallocate are unresolved. Thanks to Andes Technology sponsoring the hardware and being very helpful while doing the uClibc-ng porting. Signed-off-by: Waldemar Brodkorb <wbx@uclibc-ng.org>
Diffstat (limited to 'libc/sysdeps/linux/nds32/vfork.S')
-rw-r--r--libc/sysdeps/linux/nds32/vfork.S87
1 files changed, 87 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..c955359fb
--- /dev/null
+++ b/libc/sysdeps/linux/nds32/vfork.S
@@ -0,0 +1,87 @@
+/*
+ * Copyright (C) 2016 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 <sys/syscall.h>
+#include <sysdep.h>
+
+#define _ERRNO_H 1
+
+/* 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 PIC
+ #ifdef __NDS32_N1213_43U1H__
+ ! save lp
+ addi $r2, $lp, 0
+
+ ! set r1 as gp
+ jal 1b
+ sethi $r1, hi20(_GLOBAL_OFFSET_TABLE_)
+ ori $r1, $r1, lo12(_GLOBAL_OFFSET_TABLE_+4)
+ add $r1, $lp, $r1
+
+ ! restore lp
+ addi $lp, $r2, 0
+ #else
+ ! set r1 as gp
+ mfusr $r15, $PC
+ sethi $r1, hi20(_GLOBAL_OFFSET_TABLE_+4)
+ ori $r1, $r1, lo12(_GLOBAL_OFFSET_TABLE_+8)
+ add $r1, $r1, $r15
+ #endif
+
+ ! 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, $r1
+
+ ! jump to SYSCALL_ERROR
+ jr $r15
+# else
+ j C_SYMBOL_NAME(__syscall_error)
+# endif
+
+#else
+# error "__NR_vfork not available"
+#endif
+
+PSEUDO_END (__vfork)
+weak_alias (__vfork, vfork)
+libc_hidden_def(vfork)