2303283740
Our various fd debugging facilities get extremely confused by a vforked process closing file descriptors in preparation to exec: fdsan can abort, and fdtrack will delete backtraces for any file descriptors that get closed. Keep track of whether we're in a vforked child in order to be able to detect this. Bug: http://b/153926671 Test: 32/64-bit bionic-unit-tests on blueline, x86_64 emulator Change-Id: I8a082fd06bfdfef0e2a88dbce350b6f667f7df9f
58 lines
2.1 KiB
ArmAsm
58 lines
2.1 KiB
ArmAsm
/*
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* Copyright (C) 2015 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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ENTRY(vfork)
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__BIONIC_WEAK_ASM_FOR_NATIVE_BRIDGE(vfork)
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// r3 = &__get_tls()[TLS_SLOT_THREAD_ID]
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mrc p15, 0, r3, c13, c0, 3
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ldr r3, [r3, #(TLS_SLOT_THREAD_ID * 4)]
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// Set cached_pid_ to 0, vforked_ to 1, and stash the previous value.
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mov r0, #0x80000000
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ldr r1, [r3, #12]
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str r0, [r3, #12]
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mov ip, r7
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ldr r7, =__NR_vfork
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swi #0
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mov r7, ip
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teq r0, #0
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bxeq lr
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// rc != 0: reset cached_pid_ and vforked_.
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str r1, [r3, #12]
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cmn r0, #(MAX_ERRNO + 1)
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bxls lr
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neg r0, r0
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b __set_errno_internal
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END(vfork)
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