| /* |
| * Copyright (C) 2022 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) |
| # Push 'fn' and 'arg' onto the child stack. |
| addi a1, a1, -16 |
| sd a5, 0(a1) |
| sd a6, 8(a1) |
| |
| # Make the system call. |
| li a7, __NR_clone |
| ecall |
| |
| # Are we the child? |
| beqz a0, .L_bc_child |
| |
| # Did the clone(2) fail? |
| bltz a0, .L_bc_failure |
| # Nope, we're the parent, and our work here is done. |
| ret |
| |
| .L_bc_failure: |
| # Set errno if something went wrong. |
| neg a0, a0 |
| tail __set_errno_internal |
| |
| .L_bc_child: |
| # We're in the child now. Set the end of the frame record chain. |
| li fp, 0 |
| # Setting ra to 0 will make the unwinder stop at __start_thread. |
| li ra, 0 |
| # Call __start_thread with the 'fn' and 'arg' we stored on the child stack. |
| ld a0, 0(sp) |
| ld a1, 8(sp) |
| addi sp, sp, 16 |
| tail __start_thread |
| END(__bionic_clone) |