3e1d5563b6
The toolchain is new enough that should be able to use the actual instructions now... Test: treehugger Change-Id: I30aafcdc5386268344c40dc6cc9a22caf591915a
93 lines
2.8 KiB
ArmAsm
93 lines
2.8 KiB
ArmAsm
/*
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* Copyright (C) 2013 The Android Open Source Project
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* * Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* * Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in
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* the documentation and/or other materials provided with the
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* distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
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* FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
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* COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
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* BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
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* OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
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* AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
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* OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
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* OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*/
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#include <platform/bionic/tls_defines.h>
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#include <private/bionic_asm.h>
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#include <asm/signal.h>
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// Must match the defines in linux/sched.h
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#define CLONE_VM 0x00000100
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#define CLONE_VFORK 0x00004000
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ENTRY(vfork)
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__BIONIC_WEAK_ASM_FOR_NATIVE_BRIDGE(vfork)
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// x9 = __get_tls()[TLS_SLOT_THREAD_ID]
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mrs x9, tpidr_el0
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ldr x9, [x9, #(TLS_SLOT_THREAD_ID * 8)]
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// Set cached_pid_ to 0, vforked_ to 1, and stash the previous value.
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mov w0, #0x80000000
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ldr w10, [x9, #20]
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str w0, [x9, #20]
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mov x0, #(CLONE_VM | CLONE_VFORK | SIGCHLD)
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mov x1, xzr
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mov x2, xzr
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mov x3, xzr
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mov x4, xzr
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mov x8, __NR_clone
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svc #0
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cbz x0, .L_exit
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// rc != 0: reset cached_pid_ and vforked_.
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str w10, [x9, #20]
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cmn x0, #(MAX_ERRNO + 1)
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cneg x0, x0, hi
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b.hi __set_errno_internal
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#if __has_feature(hwaddress_sanitizer)
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cbz x0, .L_exit
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// Clean up stack shadow in the parent process.
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// https://github.com/google/sanitizers/issues/925
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paciasp
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.cfi_negate_ra_state
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stp x0, x30, [sp, #-16]!
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.cfi_adjust_cfa_offset 16
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.cfi_rel_offset x0, 0
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.cfi_rel_offset x30, 8
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add x0, sp, #16
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bl __hwasan_handle_vfork
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ldp x0, x30, [sp], #16
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.cfi_adjust_cfa_offset -16
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.cfi_restore x0
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.cfi_restore x30
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autiasp
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.cfi_negate_ra_state
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#endif
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.L_exit:
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ret
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END(vfork)
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NOTE_GNU_PROPERTY()
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