766c7efe28
The caller is only required to allocate 16 bytes on the stack for a0-a3. syscall is handling up to 6 arguments so additional space is needed on the stack to avoid corrupting the callers frame. Change-Id: I054b31696decc3e17d9c70af18cd278b852235d1
65 lines
2.1 KiB
ArmAsm
65 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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#include <asm/unistd.h>
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.text
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.globl syscall
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.align 4
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.ent syscall
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/*
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* The caller is only required to allocate 16 bytes of stack for a0-a3.
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* syscall has up to 6 arguments, so we need space for the extra two arguments.
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*/
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#define STACKSIZE 2*4
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syscall:
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.set noreorder
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.cpload $t9
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move $v0, $a0
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move $a0, $a1
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move $a1, $a2
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move $a2, $a3
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lw $a3, 16($sp)
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lw $t0, 20($sp)
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lw $t1, 24($sp)
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subu $sp, STACKSIZE
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sw $t0, 16($sp)
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sw $t1, 20($sp)
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syscall
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addu $sp, STACKSIZE
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bnez $a3, 1f
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move $a0, $v0
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j $ra
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nop
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1:
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la $t9,__set_errno
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j $t9
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nop
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.set reorder
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.end syscall
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