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f8de5057 | 1 | /* Copyright (C) 2000, 2001, 2007 Free Software Foundation, Inc. |
847b055c AJ |
2 | Contributed by Martin Schwidefsky (schwidefsky@de.ibm.com). |
3 | This file is part of the GNU C Library. | |
4 | ||
5 | The GNU C Library is free software; you can redistribute it and/or | |
41bdb6e2 AJ |
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. | |
847b055c AJ |
9 | |
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 | |
41bdb6e2 | 13 | Lesser General Public License for more details. |
847b055c | 14 | |
41bdb6e2 | 15 | You should have received a copy of the GNU Lesser General Public |
59ba27a6 PE |
16 | License along with the GNU C Library; if not, see |
17 | <http://www.gnu.org/licenses/>. */ | |
847b055c AJ |
18 | |
19 | #include <sysdep.h> | |
f8de5057 | 20 | #include <kernel-features.h> |
847b055c | 21 | |
ffeac417 | 22 | #define EINVAL 22 |
847b055c | 23 | |
85599e53 | 24 | .text |
847b055c AJ |
25 | ENTRY(__mmap) |
26 | /* Save registers and setup stack frame. */ | |
27 | stm %r6,%r15,24(%r15) | |
844a34a2 UD |
28 | cfi_offset (%r15, -36) |
29 | cfi_offset (%r14, -40) | |
30 | cfi_offset (%r13, -44) | |
31 | cfi_offset (%r12, -48) | |
32 | cfi_offset (%r11, -52) | |
33 | cfi_offset (%r10, -56) | |
34 | cfi_offset (%r9, -60) | |
35 | cfi_offset (%r8, -64) | |
36 | cfi_offset (%r7, -68) | |
37 | cfi_offset (%r6, -72) | |
847b055c | 38 | lr %r1,%r15 |
847b055c | 39 | ahi %r15,-120 /* buy stack space */ |
844a34a2 | 40 | cfi_adjust_cfa_offset (120) |
85599e53 | 41 | st %r1,0(%r15) /* store back chain */ |
847b055c | 42 | |
85599e53 UD |
43 | /* Store parameters on stack, because old_mmap/mmap2 |
44 | * take only one parameter: a pointer to the parameter area | |
847b055c | 45 | */ |
85599e53 UD |
46 | st %r6,0x70(%r15) /* Store 'fd'. */ |
47 | st %r5,0x6C(%r15) /* Store 'flags'. */ | |
48 | st %r4,0x68(%r15) /* Store 'prot'. */ | |
49 | st %r3,0x64(%r15) /* Store 'length'. */ | |
50 | st %r2,0x60(%r15) /* Store 'start'. */ | |
51 | l %r1,216(%r15) /* Load offset. */ | |
52 | ||
53 | #ifdef __ASSUME_MMAP2_SYSCALL | |
54 | /* I don't think it is worthwhile trying to use mmap2 whenever | |
55 | * it is available. Only use it when we are sure the syscall | |
56 | * exists. */ | |
57 | tml %r1,0x0fff /* Offset page aligned ? */ | |
58 | lhi %r2,-EINVAL | |
59 | jnz 1f /* No -> EINVAL. */ | |
60 | srl %r1,12 /* mmap2 takes the offset in pages. */ | |
61 | st %r1,0x74(%r15) /* Store page offset. */ | |
62 | la %r2,0x60(%r15) /* Load address of parameter list. */ | |
63 | svc SYS_ify(mmap2) /* Do the system call trap. */ | |
64 | #else | |
65 | st %r1,0x74(%r15) /* Store offset unmodified. */ | |
66 | la %r2,0x60(%r15) /* Load address of parameter list. */ | |
67 | svc SYS_ify(mmap) /* Do the system call trap. */ | |
68 | #endif | |
69 | ||
70 | 1: l %r15,0(%r15) /* Load back chain. */ | |
844a34a2 | 71 | cfi_adjust_cfa_offset (-120) |
85599e53 | 72 | lm %r6,%r15,24(%r15) /* Load registers. */ |
847b055c AJ |
73 | |
74 | /* check gpr 2 for error */ | |
75 | lhi %r0,-4096 | |
76 | clr %r2,%r0 | |
77 | jnl SYSCALL_ERROR_LABEL | |
78 | ||
79 | /* Successful; return the syscall's value. */ | |
80 | br %r14 | |
81 | ||
82 | PSEUDO_END (__mmap) | |
83 | ||
84 | weak_alias (__mmap, mmap) |