76 lines
2.8 KiB
ArmAsm
76 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 <private/bionic_asm.h>
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// pid_t __bionic_clone(int flags, void* child_stack, pid_t* parent_tid, void* tls, pid_t* child_tid, int (*fn)(void*), void* arg);
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ENTRY_PRIVATE(__bionic_clone)
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# Copy 'fn' and 'arg' onto the child stack.
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movq %r9, -16(%rsi) # fn
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movq 8(%rsp), %rax # Read 'arg'.
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movq %rax, -8(%rsi) # Write 'arg'.
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subq $16, %rsi
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# Translate to the kernel calling convention and swap the 'tls' and 'child_tid' arguments.
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# They're flipped for x86-64 compared to all our other architectures and __bionic_clone.
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movq %r8, %r10
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movq %rcx, %r8
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# Make the system call.
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movl $__NR_clone, %eax
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syscall
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# Check result.
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testq %rax, %rax
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jz .L_bc_child
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jg .L_bc_parent
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# An error occurred, set errno and return -1.
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negl %eax
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movl %eax, %edi
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call __set_errno_internal
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ret
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.L_bc_child:
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# We don't want anyone to unwind past this point.
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.cfi_undefined %rip
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.cfi_undefined %rbp
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# We're in the child now, so call __start_thread
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# with the arguments from the child stack moved into
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# the appropriate registers.
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popq %rdi # fn
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popq %rsi # arg
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call __start_thread
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hlt
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.L_bc_parent:
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# We're the parent; nothing to do.
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ret
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END(__bionic_clone)
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