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478b92f0 UD |
1 | /* Copyright (C) 1994, 1995, 1996, 1997 Free Software Foundation, Inc. |
2 | This file is part of the GNU C Library. | |
28f540f4 | 3 | |
478b92f0 UD |
4 | The GNU C Library is free software; you can redistribute it and/or |
5 | modify it under the terms of the GNU Library General Public License as | |
6 | published by the Free Software Foundation; either version 2 of the | |
7 | License, or (at your option) any later version. | |
28f540f4 | 8 | |
478b92f0 UD |
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 | Library General Public License for more details. | |
28f540f4 | 13 | |
478b92f0 UD |
14 | You should have received a copy of the GNU Library General Public |
15 | License along with the GNU C Library; see the file COPYING.LIB. If not, | |
16 | write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330, | |
17 | Boston, MA 02111-1307, USA. */ | |
28f540f4 RM |
18 | |
19 | #include <sys/types.h> | |
20 | #include <sys/mman.h> | |
21 | #include <errno.h> | |
22 | #include <hurd.h> | |
23 | #include <hurd/fd.h> | |
24 | ||
25 | /* Map addresses starting near ADDR and extending for LEN bytes. from | |
26 | OFFSET into the file FD describes according to PROT and FLAGS. If ADDR | |
27 | is nonzero, it is the desired mapping address. If the MAP_FIXED bit is | |
28 | set in FLAGS, the mapping will be at ADDR exactly (which must be | |
29 | page-aligned); otherwise the system chooses a convenient nearby address. | |
f2ea0f5b | 30 | The return value is the actual mapping address chosen or (__ptr_t) -1 |
28f540f4 RM |
31 | for errors (in which case `errno' is set). A successful `mmap' call |
32 | deallocates any previous mapping for the affected region. */ | |
33 | ||
f2ea0f5b UD |
34 | __ptr_t |
35 | __mmap (__ptr_t addr, size_t len, int prot, int flags, int fd, off_t offset) | |
28f540f4 RM |
36 | { |
37 | error_t err; | |
38 | vm_prot_t vmprot; | |
39 | memory_object_t memobj; | |
40 | vm_address_t mapaddr; | |
65bf5fa3 RM |
41 | vm_size_t pageoff; |
42 | ||
43 | pageoff = offset & (vm_page_size - 1); | |
44 | offset &= ~(vm_page_size - 1); | |
45 | ||
46 | mapaddr = (vm_address_t) addr; | |
47 | if (flags & MAP_FIXED) | |
48 | { | |
49 | /* A specific address is requested. It need not be page-aligned; | |
50 | it just needs to be congruent with the object offset. */ | |
51 | if ((mapaddr & (vm_page_size - 1)) != pageoff) | |
f2ea0f5b | 52 | return (__ptr_t) (long int) __hurd_fail (EINVAL); |
65bf5fa3 RM |
53 | else |
54 | /* We will add back PAGEOFF after mapping. */ | |
55 | mapaddr -= pageoff; | |
56 | } | |
28f540f4 RM |
57 | |
58 | vmprot = VM_PROT_NONE; | |
59 | if (prot & PROT_READ) | |
60 | vmprot |= VM_PROT_READ; | |
61 | if (prot & PROT_WRITE) | |
62 | vmprot |= VM_PROT_WRITE; | |
63 | if (prot & PROT_EXEC) | |
64 | vmprot |= VM_PROT_EXECUTE; | |
65 | ||
66 | switch (flags & MAP_TYPE) | |
67 | { | |
68 | default: | |
f2ea0f5b | 69 | return (__ptr_t) (long int) __hurd_fail (EINVAL); |
28f540f4 RM |
70 | |
71 | case MAP_ANON: | |
72 | memobj = MACH_PORT_NULL; | |
73 | break; | |
74 | ||
75 | case MAP_FILE: | |
7752137a | 76 | case 0: /* Allow, e.g., just MAP_SHARED. */ |
28f540f4 RM |
77 | { |
78 | mach_port_t robj, wobj; | |
79 | if (err = HURD_DPORT_USE (fd, __io_map (port, &robj, &wobj))) | |
f2ea0f5b | 80 | return (__ptr_t) (long int) __hurd_dfail (fd, err); |
28f540f4 RM |
81 | switch (prot & (PROT_READ|PROT_WRITE)) |
82 | { | |
83 | case PROT_READ: | |
84 | memobj = robj; | |
1a3a58fd RM |
85 | if (wobj != MACH_PORT_NULL) |
86 | __mach_port_deallocate (__mach_task_self (), wobj); | |
28f540f4 RM |
87 | break; |
88 | case PROT_WRITE: | |
89 | memobj = wobj; | |
1a3a58fd RM |
90 | if (robj != MACH_PORT_NULL) |
91 | __mach_port_deallocate (__mach_task_self (), robj); | |
28f540f4 RM |
92 | break; |
93 | case PROT_READ|PROT_WRITE: | |
28f540f4 | 94 | if (robj == wobj) |
1a3a58fd RM |
95 | { |
96 | memobj = wobj; | |
97 | /* Remove extra reference. */ | |
98 | __mach_port_deallocate (__mach_task_self (), memobj); | |
99 | } | |
100 | else if (wobj == MACH_PORT_NULL && /* Not writable by mapping. */ | |
907a1bac | 101 | !(flags & MAP_SHARED)) |
1a3a58fd RM |
102 | /* The file can only be mapped for reading. Since we are |
103 | making a private mapping, we will never try to write the | |
104 | object anyway, so we don't care. */ | |
105 | memobj = robj; | |
28f540f4 RM |
106 | else |
107 | { | |
108 | __mach_port_deallocate (__mach_task_self (), wobj); | |
f2ea0f5b | 109 | return (__ptr_t) (long int) __hurd_fail (EACCES); |
28f540f4 RM |
110 | } |
111 | break; | |
112 | } | |
113 | break; | |
114 | /* XXX handle MAP_NOEXTEND */ | |
115 | } | |
116 | } | |
117 | ||
65bf5fa3 RM |
118 | /* XXX handle MAP_INHERIT */ |
119 | ||
28f540f4 RM |
120 | err = __vm_map (__mach_task_self (), |
121 | &mapaddr, (vm_size_t) len, (vm_address_t) 0, | |
7752137a | 122 | ! (flags & MAP_FIXED), |
28f540f4 | 123 | memobj, (vm_offset_t) offset, |
65bf5fa3 | 124 | ! (flags & MAP_SHARED), |
28f540f4 | 125 | vmprot, VM_PROT_ALL, |
65bf5fa3 RM |
126 | (flags & MAP_SHARED) ? VM_INHERIT_SHARE : VM_INHERIT_COPY); |
127 | ||
787e4db9 RM |
128 | if (err == KERN_NO_SPACE && (flags & MAP_FIXED)) |
129 | { | |
130 | /* XXX this is not atomic as it is in unix! */ | |
131 | /* The region is already allocated; deallocate it first. */ | |
132 | err = __vm_deallocate (__mach_task_self (), mapaddr, len); | |
133 | if (! err) | |
134 | err = __vm_map (__mach_task_self (), | |
135 | &mapaddr, (vm_size_t) len, (vm_address_t) 0, | |
136 | 0, memobj, (vm_offset_t) offset, | |
f36f8dcf | 137 | ! (flags & MAP_SHARED), |
787e4db9 | 138 | vmprot, VM_PROT_ALL, |
f36f8dcf RM |
139 | (flags & MAP_SHARED) ? VM_INHERIT_SHARE |
140 | : VM_INHERIT_COPY); | |
787e4db9 | 141 | } |
28f540f4 RM |
142 | |
143 | if (memobj != MACH_PORT_NULL) | |
144 | __mach_port_deallocate (__mach_task_self (), memobj); | |
145 | ||
65bf5fa3 | 146 | if (err) |
f2ea0f5b | 147 | return (__ptr_t) (long int) __hurd_fail (err); |
65bf5fa3 RM |
148 | |
149 | /* Adjust the mapping address for the offset-within-page. */ | |
150 | mapaddr += pageoff; | |
151 | ||
f2ea0f5b | 152 | return (__ptr_t) mapaddr; |
28f540f4 | 153 | } |
6408bdde RM |
154 | |
155 | weak_alias (__mmap, mmap) |