2000-08-02 15:15:00 +00:00
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/* Copyright (C) 2000 Free Software Foundation, Inc.
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Contributed by Martin Schwidefsky (schwidefsky@de.ibm.com).
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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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2000-11-10 04:15:55 +00:00
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#define EINVAL 22
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2000-08-02 15:15:00 +00:00
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2000-11-10 04:15:55 +00:00
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.text
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2000-08-02 15:15:00 +00:00
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ENTRY(__mmap)
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/* Save registers and setup stack frame. */
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stm %r6,%r15,24(%r15)
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lr %r1,%r15
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ahi %r15,-120 /* buy stack space */
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2000-11-10 04:15:55 +00:00
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st %r1,0(%r15) /* store back chain */
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2000-08-02 15:15:00 +00:00
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2000-11-10 04:15:55 +00:00
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/* Store parameters on stack, because old_mmap/mmap2
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* take only one parameter: a pointer to the parameter area
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2000-08-02 15:15:00 +00:00
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*/
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2000-11-10 04:15:55 +00:00
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st %r6,0x70(%r15) /* Store 'fd'. */
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st %r5,0x6C(%r15) /* Store 'flags'. */
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st %r4,0x68(%r15) /* Store 'prot'. */
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st %r3,0x64(%r15) /* Store 'length'. */
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st %r2,0x60(%r15) /* Store 'start'. */
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l %r1,216(%r15) /* Load offset. */
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#ifdef __ASSUME_MMAP2_SYSCALL
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/* I don't think it is worthwhile trying to use mmap2 whenever
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* it is available. Only use it when we are sure the syscall
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* exists. */
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tml %r1,0x0fff /* Offset page aligned ? */
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lhi %r2,-EINVAL
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jnz 1f /* No -> EINVAL. */
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srl %r1,12 /* mmap2 takes the offset in pages. */
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st %r1,0x74(%r15) /* Store page offset. */
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la %r2,0x60(%r15) /* Load address of parameter list. */
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svc SYS_ify(mmap2) /* Do the system call trap. */
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#else
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st %r1,0x74(%r15) /* Store offset unmodified. */
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la %r2,0x60(%r15) /* Load address of parameter list. */
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svc SYS_ify(mmap) /* Do the system call trap. */
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#endif
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1: l %r15,0(%r15) /* Load back chain. */
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lm %r6,%r15,24(%r15) /* Load registers. */
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2000-08-02 15:15:00 +00:00
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/* check gpr 2 for error */
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lhi %r0,-4096
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clr %r2,%r0
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jnl SYSCALL_ERROR_LABEL
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/* Successful; return the syscall's value. */
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br %r14
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PSEUDO_END (__mmap)
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weak_alias (__mmap, mmap)
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