| /* |
| * Copyright (C) 2013 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 <asm/unistd.h> |
| #include <machine/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) |
| # Enforce 16-byte alignment for child stack. |
| andq $~15, %rsi |
| |
| # Copy 'fn' and 'arg' onto the child stack. |
| movq %r9, -16(%rsi) # fn |
| movq 8(%rsp), %rax # Read 'arg'. |
| movq %rax, -8(%rsi) # Write 'arg'. |
| |
| subq $16, %rsi |
| |
| # Translate to the kernel calling convention and swap the 'tls' and 'child_tid' arguments. |
| # They're flipped for x86-64 compared to all our other architectures and __bionic_clone. |
| movq %r8, %r10 |
| movq %rcx, %r8 |
| |
| # Make the system call. |
| movl $__NR_clone, %eax |
| syscall |
| testl %eax, %eax |
| jns 1f |
| |
| # An error occurred, set errno and return -1. |
| negl %eax |
| movl %eax, %edi |
| call __set_errno |
| orl $-1, %eax |
| jmp 2f |
| 1: |
| jnz 2f |
| |
| # We're in the child now, so call __bionic_clone_entry |
| # with the arguments from the child stack moved into |
| # the appropriate registers. |
| popq %rdi # fn |
| popq %rsi # arg |
| call __bionic_clone_entry |
| hlt |
| 2: |
| ret |
| END(__bionic_clone) |