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| /*
| * Copyright (C) 2008 The Android Open Source Project
| * All rights reserved.
| *
| * Redistribution and use in source and binary forms, with or without
| * modification, are permitted provided that the following conditions
| * are met:
| * * Redistributions of source code must retain the above copyright
| * notice, this list of conditions and the following disclaimer.
| * * Redistributions in binary form must reproduce the above copyright
| * notice, this list of conditions and the following disclaimer in
| * the documentation and/or other materials provided with the
| * distribution.
| *
| * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
| * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
| * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
| * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
| * COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
| * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
| * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
| * OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
| * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
| * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
| * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
| * SUCH DAMAGE.
| */
|
| #include <private/bionic_asm.h>
|
| // pid_t __bionic_clone(int flags, void* child_stack, pid_t* parent_tid, void* tls, pid_t* child_tid, int (*fn)(void*), void* arg);
| ENTRY_PRIVATE(__bionic_clone)
| mov ip, sp
| # save registers to parent stack
| stmfd sp!, {r4, r5, r6, r7}
| .cfi_def_cfa_offset 16
| .cfi_rel_offset r4, 0
| .cfi_rel_offset r5, 4
| .cfi_rel_offset r6, 8
| .cfi_rel_offset r7, 12
|
| # load extra parameters
| ldmfd ip, {r4, r5, r6}
|
| # Push 'fn' and 'arg' onto the child stack.
| stmdb r1!, {r5, r6}
|
| # Make the system call.
| ldr r7, =__NR_clone
| swi #0
|
| # Are we the child?
| movs r0, r0
| beq .L_bc_child
|
| # In the parent, reload saved registers then either return or set errno.
| ldmfd sp!, {r4, r5, r6, r7}
| cmn r0, #(MAX_ERRNO + 1)
| bxls lr
| neg r0, r0
| b __set_errno_internal
|
| .L_bc_child:
| # Setting lr to 0 will make the unwinder stop at __start_thread.
| mov lr, #0
| # Call __start_thread with the 'fn' and 'arg' we stored on the child stack.
| pop {r0, r1}
| b __start_thread
| END(__bionic_clone)
|
|
