| /* |
| * 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(__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 1f |
| |
| # 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 |
| |
| 1: # The 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) |
| .hidden __bionic_clone |
