851e68a240
Our <machine/asm.h> files were modified from upstream, to the extent that no architecture was actually using the upstream ENTRY or END macros, assuming that architecture even had such a macro upstream. This patch moves everyone to the same macros, with just a few tweaks remaining in the <machine/asm.h> files, which no one should now use directly. I've removed most of the unused cruft from the <machine/asm.h> files, though there's still rather a lot in the mips/mips64 ones. Bug: 12229603 Change-Id: I2fff287dc571ac1087abe9070362fb9420d85d6d
73 lines
2.7 KiB
ArmAsm
73 lines
2.7 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(__bionic_clone)
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# Enforce 16-byte alignment for child stack.
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andq $~15, %rsi
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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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testl %eax, %eax
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jns 1f
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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
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orl $-1, %eax
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jmp 2f
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1:
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jnz 2f
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# We're in the child now, so call __bionic_clone_entry
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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 __bionic_clone_entry
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hlt
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2:
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ret
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END(__bionic_clone)
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