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56 lines
1.9 KiB
ArmAsm
56 lines
1.9 KiB
ArmAsm
/* Copyright (C) 1998, 2000 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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The GNU C Library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Library General Public License as
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published by the Free Software Foundation; either version 2 of the
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License, or (at your option) any later version.
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The GNU C Library is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Library General Public License for more details.
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You should have received a copy of the GNU Library General Public
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License along with the GNU C Library; see the file COPYING.LIB. If not,
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write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
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Boston, MA 02111-1307, USA. */
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#include <sysdep.h>
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.text
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ENTRY (__mmap)
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/* Because we can only get five args through the syscall interface, and
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mmap() takes six, we need to build a parameter block and pass its
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address instead. The 386 port does a similar trick. */
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/* This code previously moved sp into ip and stored the args using
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stmdb ip!, {a1-a4}. It did not modify sp, so the stack never had
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to be restored after the syscall completed. It saved an
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instruction and meant no stack cleanup work was required.
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This will not work in the case of a mmap call being interrupted
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by a signal. If the signal handler uses any stack the arguments
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to mmap will be trashed. The results of a restart of mmap are
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then unpredictable. */
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/* store args on the stack */
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stmdb sp!, {a1-a4}
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/* do the syscall */
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mov a1, sp
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swi SYS_ify (mmap)
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/* pop args off the stack. */
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add sp, sp, #16
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cmn r0, $4096
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RETINSTR(movcc, pc, lr)
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b PLTJMP(syscall_error);
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PSEUDO_END (__mmap)
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weak_alias (__mmap, mmap)
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