| /* |
| * 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 <platform/bionic/tls_defines.h> |
| #include <private/bionic_asm.h> |
| #include <asm/signal.h> |
| #include <linux/sched.h> |
| |
| ENTRY(vfork) |
| __BIONIC_WEAK_ASM_FOR_NATIVE_BRIDGE(vfork) |
| // __get_tls()[TLS_SLOT_THREAD_ID]->cached_pid_ = 0 |
| mrs x0, tpidr_el0 |
| ldr x0, [x0, #(TLS_SLOT_THREAD_ID * 8)] |
| str wzr, [x0, #20] |
| |
| mov x0, #(CLONE_VM | CLONE_VFORK | SIGCHLD) |
| mov x1, xzr |
| mov x2, xzr |
| mov x3, xzr |
| mov x4, xzr |
| |
| mov x8, __NR_clone |
| svc #0 |
| |
| cmn x0, #(MAX_ERRNO + 1) |
| cneg x0, x0, hi |
| b.hi __set_errno_internal |
| |
| #if __has_feature(hwaddress_sanitizer) |
| cbz x0, .L_exit |
| |
| // Clean up stack shadow in the parent process. |
| // https://github.com/google/sanitizers/issues/925 |
| stp x0, x30, [sp, #-16]! |
| .cfi_adjust_cfa_offset 16 |
| .cfi_rel_offset x0, 0 |
| .cfi_rel_offset x30, 8 |
| |
| add x0, sp, #16 |
| bl __hwasan_handle_vfork |
| |
| ldp x0, x30, [sp], #16 |
| .cfi_adjust_cfa_offset -16 |
| .cfi_restore x0 |
| .cfi_restore x30 |
| |
| #endif |
| |
| .L_exit: |
| ret |
| END(vfork) |
