1 #include <u.h>
2 #include <libc.h>
3 #include <bio.h>
4 #include <mach.h>
5 #include "elf.h"
6 #include "stabs.h"
7 
8 void
9 usage(void)
10 {
11 	fprint(2, "usage: elf file list\n");
12 	fprint(2, "	elf file syms\n");
13 	fprint(2, "	elf file prog n\n");
14 	fprint(2, "	elf file sect n\n");
15 	exits("usage");
16 }
17 
18 void
19 main(int argc, char **argv)
20 {
21 	int i, n, nn;
22 	char buf[512];
23 	ulong off, len;
24 	Elf *elf;
25 	ElfProg *p;
26 	ElfSect *s;
27 
28 	ARGBEGIN{
29 	default:
30 		usage();
31 	}ARGEND
32 
33 	if(argc < 2)
34 		usage();
35 
36 	if((elf = elfopen(argv[0])) == nil)
37 		sysfatal("elfopen %s: %r", argv[0]);
38 
39 	if(strcmp(argv[1], "syms") == 0){
40 		ElfSym sym;
41 		for(i=0; elfsym(elf, i, &sym) >= 0; i++){
42 			print("%s 0x%lux +%lud bind %d type %d other %d shndx 0x%ux\n",
43 				sym.name, (ulong)sym.value, (ulong)sym.size,
44 				sym.bind, sym.type, sym.other, (uint)sym.shndx);
45 		}
46 	}
47 	else if(strcmp(argv[1], "stabs") == 0){
48 		ElfSect *s1, *s2;
49 		Stab stabs;
50 		StabSym sym;
51 
52 		if((s1 = elfsection(elf, ".stab")) == nil)
53 			sysfatal("no stabs");
54 		if(s1->link==0 || s1->link >= elf->nsect)
55 			sysfatal("bad stabstr %d", s1->link);
56 		s2 = &elf->sect[s1->link];
57 		if(elfmap(elf, s1) < 0 || elfmap(elf, s2) < 0)
58 			sysfatal("elfmap");
59 		stabs.stabbase = s1->base;
60 		stabs.stabsize = s1->size;
61 		stabs.strbase = s2->base;
62 		stabs.strsize = s2->size;
63 		stabs.e2 = elf->hdr.e2;
64 		stabs.e4 = elf->hdr.e4;
65 		print("%ud %ud\n", stabs.stabsize, stabs.strsize);
66 		for(i=0; stabsym(&stabs, i, &sym) >= 0; i++)
67 			print("%s type 0x%x other %d desc %d value 0x%lux\n",
68 				sym.name, sym.type, sym.other, (int)sym.desc, (ulong)sym.value);
69 		fprint(2, "err at %d: %r\n", i);
70 	}
71 	else if(strcmp(argv[1], "list") == 0){
72 		if(argc != 2)
73 			usage();
74 		print("elf %s %s v%d entry 0x%08lux phoff 0x%lux shoff 0x%lux flags 0x%lux\n",
75 			elftype(elf->hdr.type), elfmachine(elf->hdr.machine),
76 			elf->hdr.version, elf->hdr.entry, elf->hdr.phoff, elf->hdr.shoff,
77 			elf->hdr.flags);
78 		print("\tehsize %d phentsize %d phnum %d shentsize %d shnum %d shstrndx %d\n",
79 			elf->hdr.ehsize, elf->hdr.phentsize, elf->hdr.phnum, elf->hdr.shentsize,
80 			elf->hdr.shnum, elf->hdr.shstrndx);
81 		for(i=0; i<elf->nprog; i++){
82 			p = &elf->prog[i];
83 			print("prog %d type %d offset 0x%08lux vaddr 0x%08lux paddr 0x%08lux filesz 0x%08lux memsz 0x%08lux flags 0x%08lux align 0x%08lux\n",
84 				i, p->type, p->offset, p->vaddr, p->paddr,
85 				p->filesz, p->memsz, p->flags, p->align);
86 		}
87 		for(i=0; i<elf->nsect; i++){
88 			s = &elf->sect[i];
89 			print("sect %d %s type %d flags 0x%lux addr 0x%08lux offset 0x%08lux size 0x%08lux link 0x%lux info 0x%lux align 0x%lux entsize 0x%lux\n",
90 				i, s->name, s->type, s->flags, s->addr, s->offset, s->size, s->link, s->info,
91 				s->align, s->entsize);
92 		}
93 	}
94 	else if(strcmp(argv[1], "prog") == 0){
95 		if(argc != 3)
96 			usage();
97 		i = atoi(argv[2]);
98 		if(i < 0 || i >= elf->nprog)
99 			sysfatal("bad prog number");
100 		off = elf->prog[i].offset;
101 		len = elf->prog[i].filesz;
102 		fprint(2, "prog %d offset 0x%lux size 0x%lux\n", i, off, len);
103 	copy:
104 		seek(elf->fd, off, 0);
105 		for(n=0; n<len; n+=nn){
106 			nn = sizeof buf;
107 			if(nn > len-n)
108 				nn = len-n;
109 			nn = read(elf->fd, buf, nn);
110 			if(nn == 0)
111 				break;
112 			if(nn < 0)
113 				sysfatal("read error");
114 			write(1, buf, nn);
115 		}
116 		if(n < len)
117 			fprint(2, "early eof\n");
118 	}
119 	else if(strcmp(argv[1], "sect") == 0){
120 		if(argc != 3)
121 			usage();
122 		i = atoi(argv[2]);
123 		if(i < 0 || i >= elf->nsect)
124 			sysfatal("bad section number");
125 		off = elf->sect[i].offset;
126 		len = elf->sect[i].size;
127 		fprint(2, "section %d offset 0x%lux size 0x%lux\n", i, off, len);
128 		goto copy;
129 	}
130 	else
131 		usage();
132 	exits(0);
133 }