1 /*
2  * Copyright (c) 2004 Russ Cox.  See LICENSE.
3  */
4 
5 /* /home/rsc/papers/elfXXelf.pdf */
6 
7 typedef struct Elf Elf;
8 typedef struct ElfHdr ElfHdr;
9 typedef struct ElfSect ElfSect;
10 typedef struct ElfProg ElfProg;
11 typedef struct ElfNote ElfNote;
12 typedef struct ElfSym ElfSym;
13 
14 enum
15 {
16 	ElfClassNone = 0,
17 	ElfClass32,
18 	ElfClass64,
19 
20 	ElfDataNone = 0,
21 	ElfDataLsb,
22 	ElfDataMsb,
23 
24 	ElfTypeNone = 0,
25 	ElfTypeRelocatable,
26 	ElfTypeExecutable,
27 	ElfTypeSharedObject,
28 	ElfTypeCore,
29 	/* 0xFF00 - 0xFFFF reserved for processor-specific types */
30 
31 	ElfMachNone = 0,
32 	ElfMach32100,		/* AT&T WE 32100 */
33 	ElfMachSparc,		/* SPARC */
34 	ElfMach386,		/* Intel 80386 */
35 	ElfMach68000,		/* Motorola 68000 */
36 	ElfMach88000,		/* Motorola 88000 */
37 	ElfMach486,		/* Intel 80486, no longer used */
38 	ElfMach860,		/* Intel 80860 */
39 	ElfMachMips,		/* MIPS RS3000 */
40 	ElfMachS370,		/* IBM System/370 */
41 	ElfMachMipsLe,	/* MIPS RS3000 LE */
42 	ElfMachParisc = 15,		/* HP PA RISC */
43 	ElfMachVpp500 = 17,	/* Fujitsu VPP500 */
44 	ElfMachSparc32Plus,	/* SPARC V8+ */
45 	ElfMach960,		/* Intel 80960 */
46 	ElfMachPower,		/* PowerPC */
47 	ElfMachPower64,	/* PowerPC 64 */
48 	ElfMachS390,		/* IBM System/390 */
49 	ElfMachV800 = 36,	/* NEC V800 */
50 	ElfMachFr20,		/* Fujitsu FR20 */
51 	ElfMachRh32,		/* TRW RH-32 */
52 	ElfMachRce,		/* Motorola RCE */
53 	ElfMachArm,		/* ARM */
54 	ElfMachAlpha,		/* Digital Alpha */
55 	ElfMachSH,		/* Hitachi SH */
56 	ElfMachSparc9,		/* SPARC V9 */
57 	/* and the list goes on... */
58 
59 	ElfAbiNone = 0,
60 	ElfAbiSystemV = 0,	/* [sic] */
61 	ElfAbiHPUX,
62 	ElfAbiNetBSD,
63 	ElfAbiLinux,
64 	ElfAbiSolaris = 6,
65 	ElfAbiAix,
66 	ElfAbiIrix,
67 	ElfAbiFreeBSD,
68 	ElfAbiTru64,
69 	ElfAbiModesto,
70 	ElfAbiOpenBSD,
71 	ElfAbiARM = 97,
72 	ElfAbiEmbedded = 255,
73 
74 	/* some of sections 0xFF00 - 0xFFFF reserved for various things */
75 	ElfSectNone = 0,
76 	ElfSectProgbits,
77 	ElfSectSymtab,
78 	ElfSectStrtab,
79 	ElfSectRela,
80 	ElfSectHash,
81 	ElfSectDynamic,
82 	ElfSectNote,
83 	ElfSectNobits,
84 	ElfSectRel,
85 	ElfSectShlib,
86 	ElfSectDynsym,
87 
88 	ElfSectFlagWrite = 0x1,
89 	ElfSectFlagAlloc = 0x2,
90 	ElfSectFlagExec = 0x4,
91 	/* 0xF0000000 are reserved for processor specific */
92 
93 	ElfSymBindLocal = 0,
94 	ElfSymBindGlobal,
95 	ElfSymBindWeak,
96 	/* 13-15 reserved */
97 
98 	ElfSymTypeNone = 0,
99 	ElfSymTypeObject,
100 	ElfSymTypeFunc,
101 	ElfSymTypeSection,
102 	ElfSymTypeFile,
103 	/* 13-15 reserved */
104 
105 	ElfSymShnNone = 0,
106 	ElfSymShnAbs = 0xFFF1,
107 	ElfSymShnCommon = 0xFFF2,
108 	/* 0xFF00-0xFF1F reserved for processors */
109 	/* 0xFF20-0xFF3F reserved for operating systems */
110 
111 	ElfProgNone = 0,
112 	ElfProgLoad,
113 	ElfProgDynamic,
114 	ElfProgInterp,
115 	ElfProgNote,
116 	ElfProgShlib,
117 	ElfProgPhdr,
118 
119 	ElfProgFlagExec = 0x1,
120 	ElfProgFlagWrite = 0x2,
121 	ElfProgFlagRead = 0x4,
122 
123 	ElfNotePrStatus = 1,
124 	ElfNotePrFpreg = 2,
125 	ElfNotePrPsinfo = 3,
126 	ElfNotePrTaskstruct = 4,
127 	ElfNotePrAuxv = 6,
128 	ElfNotePrXfpreg = 0x46e62b7f,	/* for gdb/386 */
129 };
130 
131 struct ElfHdr
132 {
133 	uchar	magic[4];
134 	uchar	class;
135 	uchar	encoding;
136 	uchar	version;
137 	uchar	abi;
138 	uchar	abiversion;
139 	u32int	type;
140 	u32int	machine;
141 	u32int	entry;
142 	u32int	phoff;
143 	u32int	shoff;
144 	u32int	flags;
145 	u32int	ehsize;
146 	u32int	phentsize;
147 	u32int	phnum;
148 	u32int	shentsize;
149 	u32int	shnum;
150 	u32int	shstrndx;
151 	u16int	(*e2)(uchar*);
152 	u32int	(*e4)(uchar*);
153 	u64int	(*e8)(uchar*);
154 };
155 
156 struct ElfSect
157 {
158 	char		*name;
159 	u32int	type;
160 	u32int	flags;
161 	u32int	addr;
162 	u32int	offset;
163 	u32int	size;
164 	u32int	link;
165 	u32int	info;
166 	u32int	align;
167 	u32int	entsize;
168 	uchar	*base;
169 };
170 
171 struct ElfProg
172 {
173 	u32int	type;
174 	u32int	offset;
175 	u32int	vaddr;
176 	u32int	paddr;
177 	u32int	filesz;
178 	u32int	memsz;
179 	u32int	flags;
180 	u32int	align;
181 };
182 
183 struct ElfNote
184 {
185 	u32int	namesz;
186 	u32int	descsz;
187 	u32int	type;
188 	char	*name;
189 	uchar	*desc;
190 	u32int	offset;	/* in-memory only */
191 };
192 
193 struct ElfSym
194 {
195 	char*	name;
196 	u32int	value;
197 	u32int	size;
198 	uchar	bind;
199 	uchar	type;
200 	uchar	other;
201 	u16int	shndx;
202 };
203 
204 struct Elf
205 {
206 	int		fd;
207 	ElfHdr	hdr;
208 	ElfSect	*sect;
209 	uint		nsect;
210 	ElfProg	*prog;
211 	uint		nprog;
212 	char		*shstrtab;
213 
214 	int		nsymtab;
215 	ElfSect	*symtab;
216 	ElfSect	*symstr;
217 	int		ndynsym;
218 	ElfSect	*dynsym;
219 	ElfSect	*dynstr;
220 	ElfSect	*bss;
221 	ulong	dynamic;		/* offset to elf dynamic crap */
222 
223 	int		(*coreregs)(Elf*, ElfNote*, uchar**);
224 	int		(*corecmd)(Elf*, ElfNote*, char**);
225 };
226 
227 Elf*	elfopen(char*);
228 Elf*	elfinit(int);
229 ElfSect *elfsection(Elf*, char*);
230 void	elfclose(Elf*);
231 int	elfsym(Elf*, int, ElfSym*);
232 int	elfsymlookup(Elf*, char*, ulong*);
233 int	elfmap(Elf*, ElfSect*);
234 
235 struct Fhdr;
236 void	elfcorelinux386(struct Fhdr*, Elf*, ElfNote*);
237 void	elfdl386mapdl(int);