1 /* Copyright (C) 2000, 2001, 2007 Free Software Foundation, Inc.
2 Contributed by Martin Schwidefsky (schwidefsky@de.ibm.com).
3 This file is part of the GNU C Library.
5 The GNU C Library is free software; you can redistribute it and/or
6 modify it under the terms of the GNU Lesser General Public
7 License as published by the Free Software Foundation; either
8 version 2.1 of the License, or (at your option) any later version.
10 The GNU C Library is distributed in the hope that it will be useful,
11 but WITHOUT ANY WARRANTY; without even the implied warranty of
12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
13 Lesser General Public License for more details.
15 You should have received a copy of the GNU Lesser General Public
16 License along with the GNU C Library; if not, write to the Free
17 Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
21 #include <kernel-features.h>
27 /* Save registers and setup stack frame. */
29 cfi_offset (%r15, -36)
30 cfi_offset (%r14, -40)
31 cfi_offset (%r13, -44)
32 cfi_offset (%r12, -48)
33 cfi_offset (%r11, -52)
34 cfi_offset (%r10, -56)
40 ahi %r15,-120 /* buy stack space */
41 cfi_adjust_cfa_offset (120)
42 st %r1,0(%r15) /* store back chain */
44 /* Store parameters on stack, because old_mmap/mmap2
45 * take only one parameter: a pointer to the parameter area
47 st %r6,0x70(%r15) /* Store 'fd'. */
48 st %r5,0x6C(%r15) /* Store 'flags'. */
49 st %r4,0x68(%r15) /* Store 'prot'. */
50 st %r3,0x64(%r15) /* Store 'length'. */
51 st %r2,0x60(%r15) /* Store 'start'. */
52 l %r1,216(%r15) /* Load offset. */
54 #ifdef __ASSUME_MMAP2_SYSCALL
55 /* I don't think it is worthwhile trying to use mmap2 whenever
56 * it is available. Only use it when we are sure the syscall
58 tml %r1,0x0fff /* Offset page aligned ? */
60 jnz 1f /* No -> EINVAL. */
61 srl %r1,12 /* mmap2 takes the offset in pages. */
62 st %r1,0x74(%r15) /* Store page offset. */
63 la %r2,0x60(%r15) /* Load address of parameter list. */
64 svc SYS_ify(mmap2) /* Do the system call trap. */
66 st %r1,0x74(%r15) /* Store offset unmodified. */
67 la %r2,0x60(%r15) /* Load address of parameter list. */
68 svc SYS_ify(mmap) /* Do the system call trap. */
71 1: l %r15,0(%r15) /* Load back chain. */
72 cfi_adjust_cfa_offset (-120)
73 lm %r6,%r15,24(%r15) /* Load registers. */
75 /* check gpr 2 for error */
78 jnl SYSCALL_ERROR_LABEL
80 /* Successful; return the syscall's value. */
85 weak_alias (__mmap, mmap)