74 lines
2.5 KiB
ArmAsm
74 lines
2.5 KiB
ArmAsm
/*
|
|
* Copyright (C) 2008-2010 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(__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}
|
|
|
|
# store 'fn' and 'arg' to the child stack
|
|
str r5, [r1, #-4]
|
|
str r6, [r1, #-8]
|
|
|
|
# System call
|
|
ldr r7, =__NR_clone
|
|
swi #0
|
|
movs r0, r0
|
|
beq 1f
|
|
|
|
# In the parent, reload saved registers then either return or set errno.
|
|
ldmfd sp!, {r4, r5, r6, r7}
|
|
.cfi_def_cfa_offset 0
|
|
cmn r0, #(MAX_ERRNO + 1)
|
|
bxls lr
|
|
neg r0, r0
|
|
b __set_errno
|
|
|
|
1: # The child.
|
|
# Re-add the unwind directives that were reset from above.
|
|
.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
|
|
ldr r0, [sp, #-4]
|
|
ldr r1, [sp, #-8]
|
|
b __bionic_clone_entry
|
|
END(__bionic_clone)
|