1 /*
2 * Copyright 2011, The Android Open Source Project
3 *
4 * Licensed under the Apache License, Version 2.0 (the "License");
5 * you may not use this file except in compliance with the License.
6 * You may obtain a copy of the License at
7 *
8 * http://www.apache.org/licenses/LICENSE-2.0
9 *
10 * Unless required by applicable law or agreed to in writing, software
11 * distributed under the License is distributed on an "AS IS" BASIS,
12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13 * See the License for the specific language governing permissions and
14 * limitations under the License.
15 */
16
17 #ifndef ELF_SECTION_PROGBITS_HXX
18 #define ELF_SECTION_PROGBITS_HXX
19
20 #include "ELFTypes.h"
21 #include "StubLayout.h"
22
23 #include <llvm/Support/Format.h>
24 #include <llvm/Support/raw_ostream.h>
25
26 #include "utils/raw_ostream.h"
27
28 #include <string.h>
29
30 template <unsigned Bitwidth>
31 template <typename Archiver>
32 ELFSectionProgBits<Bitwidth> *
read(Archiver & AR,ELFObjectTy * owner,ELFSectionHeaderTy const * sh)33 ELFSectionProgBits<Bitwidth>::read(Archiver &AR,
34 ELFObjectTy *owner,
35 ELFSectionHeaderTy const *sh) {
36
37 llvm::OwningPtr<ELFSectionProgBits> result(new ELFSectionProgBits());
38
39 // TODO: Not every section needs a stub.
40 #ifdef __arm__
41 // Count the extern function symbol
42 ELFSectionSymTabTy const *symtab =
43 static_cast<ELFSectionSymTabTy *>(owner->getSectionByName(".symtab"));
44
45 // TODO: May not call this function every progbits section.
46 size_t func_count = symtab->getExternFuncCount();
47
48 StubLayout *stubs = result->getStubLayout();
49
50 // TODO: May be too many stubs.
51 // Calculate additional stub size
52 size_t stub_size = stubs->calcStubTableSize(func_count);
53
54 // Allocate progbits section + stub
55 if (!result->chunk.allocate(sh->getSize() + stub_size)) {
56 return NULL;
57 }
58
59 stubs->initStubTable(result->chunk.getBuffer()+sh->getSize(), func_count);
60 #else
61 // Allocate text section
62 if (!result->chunk.allocate(sh->getSize())) {
63 return NULL;
64 }
65 #endif
66
67 result->sh = sh;
68
69 if (!result->serialize(AR)) {
70 // Unable to read the progbits section.
71 return NULL;
72 }
73
74 return result.take();
75 }
76
77 #endif // ELF_SECTION_PROGBITS_HXX
78