projects / thirdparty / glibc.git / blame
| Commit | Line | Data |
|---|---|---|
| b168057a | 1 | /* Copyright (C) 2000-2015 Free Software Foundation, Inc. |
| de96d148 DJ |
2 | This file is part of the GNU C Library. |
| 3 | ||
| 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. | |
| 8 | ||
| 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. | |
| 13 | ||
| 14 | You should have received a copy of the GNU Lesser General Public | |
| ab84e3ff PE |
15 | License along with the GNU C Library. If not, see |
| 16 | <http://www.gnu.org/licenses/>. */ | |
| de96d148 DJ |
17 | |
| 18 | #include <sysdep.h> | |
| 19 | ||
| 6ccd0107 RH |
20 | .syntax unified |
| 21 | ||
| de96d148 DJ |
22 | #define EINVAL 22 |
| 23 | ||
| 24 | #ifdef __ARMEB__ | |
| 25 | # define LOW_OFFSET 8 + 4 | |
| 26 | /* The initial + 4 is for the stack postdecrement. */ | |
| 27 | # define HIGH_OFFSET 4 + 8 + 0 | |
| 28 | #else | |
| 29 | # define LOW_OFFSET 8 + 0 | |
| 30 | # define HIGH_OFFSET 4 + 8 + 4 | |
| 31 | #endif | |
| 32 | ||
| 33 | /* The mmap2 system call takes six arguments, all in registers. */ | |
| 34 | .text | |
| 35 | ENTRY (__mmap64) | |
| 36 | ldr ip, [sp, $LOW_OFFSET] | |
| 55668624 | 37 | push { r5 } |
| 01b32e73 TS |
38 | cfi_adjust_cfa_offset (4) |
| 39 | cfi_rel_offset (r5, 0) | |
| de96d148 | 40 | ldr r5, [sp, $HIGH_OFFSET] |
| 55668624 | 41 | push { r4 } |
| 01b32e73 TS |
42 | cfi_adjust_cfa_offset (4) |
| 43 | cfi_rel_offset (r4, 0) | |
| 44 | cfi_remember_state | |
| de96d148 DJ |
45 | movs r4, ip, lsl $20 @ check that offset is page-aligned |
| 46 | mov ip, ip, lsr $12 | |
| 6ccd0107 RH |
47 | it eq |
| 48 | movseq r4, r5, lsr $12 @ check for overflow | |
| de96d148 DJ |
49 | bne .Linval |
| 50 | ldr r4, [sp, $8] @ load fd | |
| 51 | orr r5, ip, r5, lsl $20 @ compose page offset | |
| 52 | DO_CALL (mmap2, 0) | |
| 53 | cmn r0, $4096 | |
| 55668624 | 54 | pop {r4, r5} |
| 01b32e73 TS |
55 | cfi_adjust_cfa_offset (-8) |
| 56 | cfi_restore (r4) | |
| 57 | cfi_restore (r5) | |
| 6ccd0107 | 58 | it cc |
| de96d148 DJ |
59 | RETINSTR(cc, lr) |
| 60 | b PLTJMP(syscall_error) | |
| 01b32e73 TS |
61 | |
| 62 | cfi_restore_state | |
| de96d148 DJ |
63 | .Linval: |
| 64 | mov r0, $-EINVAL | |
| 55668624 | 65 | pop {r4, r5} |
| 01b32e73 TS |
66 | cfi_adjust_cfa_offset (-8) |
| 67 | cfi_restore (r4) | |
| 68 | cfi_restore (r5) | |
| de96d148 DJ |
69 | b PLTJMP(syscall_error) |
| 70 | PSEUDO_END (__mmap64) | |
| 71 | ||
| 72 | weak_alias (__mmap64, mmap64) |