ed74484dcb
We only need it for MAX_ERRNO, and it's time we had somewhere to put the little assembler utility macros we've been putting off writing. Change-Id: I9354d2e0dc47c689296a34b5b229fc9ba75f1a83
64 lines
2.1 KiB
ArmAsm
64 lines
2.1 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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/*
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* Generic syscall call.
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* Upon entry:
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* %rax: system call number
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* %rdi: arg0 to system call
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* %rsi: arg1
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* %rdx: arg2
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* %rcx: arg3 - syscall expects it at %r10
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* %r8: arg4
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* %r9: arg5
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*/
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#include <private/bionic_asm.h>
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ENTRY(syscall)
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# All arguments are passed via registers.
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# (Not all will be valid, depending on the syscall.)
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mov %edi, %eax
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mov %rsi, %rdi
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mov %rdx, %rsi
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mov %rcx, %rdx
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mov %r8, %r10
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mov %r9, %r8
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mov 8(%rsp), %r9
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# Make the system call.
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syscall
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cmpq $-MAX_ERRNO, %rax
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jb 1f
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negl %eax
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movl %eax, %edi
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call __set_errno
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orq $-1, %rax
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1:
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ret
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END(syscall)
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