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| /*
| * 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 <private/bionic_asm.h>
| #include <private/bionic_asm_tls.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)
|
|
