1 /* Copyright (C) 2000 Free Software Foundation, Inc.
2 This file is part of the GNU C Library.
4 The GNU C Library is free software; you can redistribute it and/or
5 modify it under the terms of the GNU Lesser General Public
6 License as published by the Free Software Foundation; either
7 version 2.1 of the License, or (at your option) any later version.
9 The GNU C Library is distributed in the hope that it will be useful,
10 but WITHOUT ANY WARRANTY; without even the implied warranty of
11 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
12 Lesser General Public License for more details.
14 You should have received a copy of the GNU Lesser General Public
15 License along with the GNU C Library; if not, see
16 <http://www.gnu.org/licenses/>. */
20 #include <bits/errno.h>
21 #include <sys/syscall.h>
22 #include <bits/arm_asm.h>
26 /* The mmap2 system call takes six arguments, all in registers. */
29 .type mmap64,%function
33 #if defined(THUMB1_ONLY)
37 /* Offsets are after pushing 3 words. */
38 # define LOW_OFFSET 12 + 8 + 4
39 # define HIGH_OFFSET 12 + 8 + 0
41 # define LOW_OFFSET 12 + 8 + 0
42 # define HIGH_OFFSET 12 + 8 + 4
45 ldr r6, [sp, $LOW_OFFSET]
46 ldr r5, [sp, $HIGH_OFFSET]
47 lsl r4, r6, #20 @ check that offset is page-aligned
49 lsr r4, r5, #12 @ check for overflow
55 ldr r4, [sp, #8] @ load fd
69 #else /* !THUMB1_ONLY */
72 # define LOW_OFFSET 8 + 4
73 /* The initial + 4 is for the stack postdecrement. */
74 # define HIGH_OFFSET 4 + 8 + 0
76 # define LOW_OFFSET 8 + 0
77 # define HIGH_OFFSET 4 + 8 + 4
79 ldr ip, [sp, $LOW_OFFSET]
81 ldr r5, [sp, $HIGH_OFFSET]
83 movs r4, ip, lsl $20 @ check that offset is page-aligned
86 moveqs r4, r5, lsr $12 @ check for overflow
88 ldr r4, [sp, $8] @ load fd
89 orr r5, ip, r5, lsl $20 @ compose page offset
94 #if defined(__USE_BX__)
105 #else /* !__ARM_EABI__ */
107 stmfd sp!, {r4, r5, lr}
110 movs ip, r5, lsl $20 @ check that offset is page-aligned
114 orr r5, r5, ip, lsl $20 @ compose page offset
116 bne .Linval @ check for overflow
120 ldmccfd sp!, {r4, r5, pc}
122 ldmnefd sp!, {r4, r5, lr}
124 /* The current kernel does not support mmap2. Fall back to plain
125 mmap if the offset is small enough. */
127 mov r0, ip @ first arg was clobbered
129 ldmeqfd sp!, {r4, r5, lr}
130 beq HIDDEN_JUMPTARGET(mmap)
133 ldmfd sp!, {r4, r5, lr}
139 .size mmap64,.-mmap64