36
37 public class ElfSection {
38 String name;
39 ByteBuffer section;
40 byte [] data;
41 boolean hasrelocations;
42 int sectionIndex;
43
44 /**
45 * String holding section name strings
46 */
47 private static StringBuilder sectNameTab = new StringBuilder();
48
49 /**
50 * Keeps track of bytes in section string table since strTabContent.length()
51 * is number of chars, not bytes.
52 */
53 private static int shStrTabNrOfBytes = 0;
54
55 public ElfSection(String sectName, byte [] sectData, int sectFlags,
56 int sectType, boolean hasRelocations, int sectIndex) {
57
58 long align;
59
60 section = ElfByteBuffer.allocate(Elf64_Shdr.totalsize);
61
62 // Return all 0's for NULL section
63 if (sectIndex == 0) {
64 sectNameTab.append('\0');
65 shStrTabNrOfBytes += 1;
66 data = null;
67 hasrelocations = false;
68 sectionIndex = 0;
69 return;
70 }
71
72 section.putInt(Elf64_Shdr.sh_name.off, shStrTabNrOfBytes);
73 sectNameTab.append(sectName).append('\0');
74 shStrTabNrOfBytes += (sectName.getBytes().length + 1);
75 name = sectName;
76
77 section.putInt(Elf64_Shdr.sh_type.off, sectType);
78 section.putLong(Elf64_Shdr.sh_flags.off, sectFlags);
79 section.putLong(Elf64_Shdr.sh_addr.off, 0);
80 section.putLong(Elf64_Shdr.sh_offset.off, 0);
81
82 if (sectName.equals(".shstrtab")) {
83 section.putLong(Elf64_Shdr.sh_size.off, shStrTabNrOfBytes);
84 data = sectNameTab.toString().getBytes();
85 }
86 else {
87 data = sectData;
88 section.putLong(Elf64_Shdr.sh_size.off, sectData.length);
89 }
90
91 section.putLong(Elf64_Shdr.sh_entsize.off, 0);
92
93 // Determine the alignment and entrysize
94 // based on type of section
95 switch (sectType) {
96 case Elf64_Shdr.SHT_PROGBITS:
97 if ((sectFlags & Elf64_Shdr.SHF_EXECINSTR) != 0)
98 align = 16;
99 else
100 align = 4;
101 break;
102 case Elf64_Shdr.SHT_SYMTAB:
103 align = 8;
104 section.putLong(Elf64_Shdr.sh_entsize.off, Elf64_Sym.totalsize);
105 break;
106 case Elf64_Shdr.SHT_STRTAB:
107 align = 1;
108 break;
109 case Elf64_Shdr.SHT_RELA:
110 align = 8;
111 section.putLong(Elf64_Shdr.sh_entsize.off, Elf64_Rela.totalsize);
112 break;
113 case Elf64_Shdr.SHT_REL:
114 align = 8;
115 section.putLong(Elf64_Shdr.sh_entsize.off, Elf64_Rel.totalsize);
116 break;
117 case Elf64_Shdr.SHT_NOBITS:
118 align = 4;
119 break;
120 default:
121 align = 8;
122 break;
123 }
124 section.putLong(Elf64_Shdr.sh_addralign.off, align);
125
126 hasrelocations = hasRelocations;
127 sectionIndex = sectIndex;
128 }
129
130 public String getName() {
131 return name;
132 }
133
134 public long getSize() {
135 return section.getLong(Elf64_Shdr.sh_size.off);
136 }
137
138 public int getDataAlign() {
139 return ((int)section.getLong(Elf64_Shdr.sh_addralign.off));
140 }
141
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36
37 public class ElfSection {
38 String name;
39 ByteBuffer section;
40 byte [] data;
41 boolean hasrelocations;
42 int sectionIndex;
43
44 /**
45 * String holding section name strings
46 */
47 private static StringBuilder sectNameTab = new StringBuilder();
48
49 /**
50 * Keeps track of bytes in section string table since strTabContent.length()
51 * is number of chars, not bytes.
52 */
53 private static int shStrTabNrOfBytes = 0;
54
55 public ElfSection(String sectName, byte [] sectData, int sectFlags,
56 int sectType, boolean hasRelocations, int align,
57 int sectIndex) {
58
59 section = ElfByteBuffer.allocate(Elf64_Shdr.totalsize);
60
61 // Return all 0's for NULL section
62 if (sectIndex == 0) {
63 sectNameTab.append('\0');
64 shStrTabNrOfBytes += 1;
65 data = null;
66 hasrelocations = false;
67 sectionIndex = 0;
68 return;
69 }
70
71 section.putInt(Elf64_Shdr.sh_name.off, shStrTabNrOfBytes);
72 sectNameTab.append(sectName).append('\0');
73 shStrTabNrOfBytes += (sectName.getBytes().length + 1);
74 name = sectName;
75
76 section.putInt(Elf64_Shdr.sh_type.off, sectType);
77 section.putLong(Elf64_Shdr.sh_flags.off, sectFlags);
78 section.putLong(Elf64_Shdr.sh_addr.off, 0);
79 section.putLong(Elf64_Shdr.sh_offset.off, 0);
80
81 if (sectName.equals(".shstrtab")) {
82 section.putLong(Elf64_Shdr.sh_size.off, shStrTabNrOfBytes);
83 data = sectNameTab.toString().getBytes();
84 }
85 else {
86 data = sectData;
87 section.putLong(Elf64_Shdr.sh_size.off, sectData.length);
88 }
89
90 section.putLong(Elf64_Shdr.sh_entsize.off, 0);
91
92 // Determine the entrysize
93 // based on type of section
94 switch (sectType) {
95 case Elf64_Shdr.SHT_SYMTAB:
96 section.putLong(Elf64_Shdr.sh_entsize.off, Elf64_Sym.totalsize);
97 break;
98 case Elf64_Shdr.SHT_RELA:
99 section.putLong(Elf64_Shdr.sh_entsize.off, Elf64_Rela.totalsize);
100 break;
101 case Elf64_Shdr.SHT_REL:
102 section.putLong(Elf64_Shdr.sh_entsize.off, Elf64_Rel.totalsize);
103 break;
104 default:
105 break;
106 }
107 section.putLong(Elf64_Shdr.sh_addralign.off, align);
108
109 hasrelocations = hasRelocations;
110 sectionIndex = sectIndex;
111 }
112
113 public String getName() {
114 return name;
115 }
116
117 public long getSize() {
118 return section.getLong(Elf64_Shdr.sh_size.off);
119 }
120
121 public int getDataAlign() {
122 return ((int)section.getLong(Elf64_Shdr.sh_addralign.off));
123 }
124
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