zte's code,first commit
Change-Id: I9a04da59e459a9bc0d67f101f700d9d7dc8d681b
diff --git a/ap/build/uClibc/libc/sysdeps/linux/arm/clone.S b/ap/build/uClibc/libc/sysdeps/linux/arm/clone.S
new file mode 100644
index 0000000..fdc05b8
--- /dev/null
+++ b/ap/build/uClibc/libc/sysdeps/linux/arm/clone.S
@@ -0,0 +1,138 @@
+/* Copyright (C) 1996, 1997, 1998, 1999 Free Software Foundation, Inc.
+ This file is part of the GNU C Library.
+ Contributed by Pat Beirne <patb@corelcomputer.com>
+
+ 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. */
+
+/* clone() is even more special than fork() as it mucks with stacks
+ and invokes a function in the right context after its all over. */
+
+#define _ERRNO_H
+#include <features.h>
+#include <bits/errno.h>
+#include <sys/syscall.h>
+#include <bits/arm_asm.h>
+
+#if defined(__NR_clone)
+/* int clone(int (*fn)(void *arg), void *child_stack, int flags, void *arg); */
+
+.text
+.global __clone
+.type __clone,%function
+.align 2
+#if defined(THUMB1_ONLY)
+.thumb_func
+__clone:
+ @ sanity check args
+ cmp r0, #0
+ beq __einval
+ cmp r1, #0
+ beq __einval
+
+ @ insert the args onto the new stack
+ sub r1, r1, #8
+ str r3, [r1, #4]
+ @ save the function pointer as the 0th element
+ str r0, [r1]
+
+ @ do the system call
+ @ get flags
+ mov r0, r2
+ @ new sp is already in r1
+ @ load remaining arguments off the stack
+ stmfd sp!, {r4}
+ ldr r2, [sp, #4]
+ ldr r3, [sp, #8]
+ ldr r4, [sp, #12]
+ DO_CALL (clone)
+ movs a1, a1
+ blt __error
+ ldmnefd sp!, {r4}
+ beq 1f
+ bx lr
+1:
+
+ @ pick the function arg and call address off the stack and execute
+ ldr r0, [sp, #4]
+ ldr r1, [sp]
+ bl 2f @ blx r1
+
+ @ and we are done, passing the return value through r0
+ bl HIDDEN_JUMPTARGET(_exit)
+ @ Should never return
+ b .
+
+2:
+ bx r1
+
+__einval:
+ ldr r0, =-EINVAL
+__error:
+ push {r3, lr}
+ bl __syscall_error
+ POP_RET
+.pool
+#else
+__clone:
+ @ sanity check args
+ cmp r0, #0
+ IT(te, ne)
+ cmpne r1, #0
+ moveq r0, #-EINVAL
+ beq __error
+
+ @ insert the args onto the new stack
+ sub r1, r1, #8
+ str r3, [r1, #4]
+ @ save the function pointer as the 0th element
+ str r0, [r1]
+
+ @ do the system call
+ @ get flags
+ mov r0, r2
+ @ new sp is already in r1
+ @ load remaining arguments off the stack
+ stmfd sp!, {r4}
+ ldr r2, [sp, #4]
+ ldr r3, [sp, #8]
+ ldr r4, [sp, #12]
+ DO_CALL (clone)
+ movs a1, a1
+ blt __error
+ ldmnefd sp!, {r4}
+ IT(t, ne)
+#if defined(__USE_BX__)
+ bxne lr
+#else
+ movne pc, lr
+#endif
+
+ @ pick the function arg and call address off the stack and execute
+ ldr r0, [sp, #4]
+ mov lr, pc
+ ldr pc, [sp]
+
+ @ and we are done, passing the return value through r0
+ b HIDDEN_JUMPTARGET(_exit)
+
+__error:
+ b __syscall_error
+#endif
+
+.size __clone,.-__clone
+weak_alias(__clone, clone)
+
+#endif