Annotation of src/usr.bin/nm/elf.c, Revision 1.4
1.4 ! mickey 1: /* $OpenBSD: elf.c,v 1.3 2004/03/30 15:12:38 mickey Exp $ */
1.1 mickey 2:
3: /*
4: * Copyright (c) 2003 Michael Shalayeff
5: * All rights reserved.
6: *
7: * Redistribution and use in source and binary forms, with or without
8: * modification, are permitted provided that the following conditions
9: * are met:
10: * 1. Redistributions of source code must retain the above copyright
11: * notice, this list of conditions and the following disclaimer.
12: * 2. Redistributions in binary form must reproduce the above copyright
13: * notice, this list of conditions and the following disclaimer in the
14: * documentation and/or other materials provided with the distribution.
15: *
16: * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
17: * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
18: * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
19: * IN NO EVENT SHALL THE AUTHOR OR HIS RELATIVES BE LIABLE FOR ANY DIRECT,
20: * INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
21: * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
22: * SERVICES; LOSS OF MIND, USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
23: * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
24: * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
25: * IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF
26: * THE POSSIBILITY OF SUCH DAMAGE.
27: */
28:
29: #if ELF_TARG_CLASS == ELFCLASS32
30: #define swap_addr swap32
31: #define swap_off swap32
32: #define swap_sword swap32
33: #define swap_word swap32
34: #define swap_sxword swap32
35: #define swap_xword swap32
36: #define swap_half swap16
37: #define swap_quarter swap16
38: #elif ELF_TARG_CLASS == ELFCLASS64
39: #define swap_addr swap64
40: #define swap_off swap64
41: #ifdef __alpha__
42: #define swap_sword swap64
43: #define swap_word swap64
44: #else
45: #define swap_sword swap32
46: #define swap_word swap32
47: #endif
48: #define swap_sxword swap64
49: #define swap_xword swap64
50: #define swap_half swap64
51: #define swap_quarter swap16
52: #else
53: #error "Unsupported ELF class"
54: #endif
55:
1.3 mickey 56: #define ELF_SBSS ".sbss"
57:
1.1 mickey 58: int
59: elf_fix_header(Elf_Ehdr *eh)
60: {
61: /* nothing to do */
62: if (eh->e_ident[EI_DATA] == ELF_TARG_DATA)
63: return (0);
64:
65: eh->e_type = swap16(eh->e_type);
66: eh->e_machine = swap16(eh->e_machine);
67: eh->e_version = swap32(eh->e_version);
68: eh->e_entry = swap_addr(eh->e_entry);
69: eh->e_phoff = swap_off(eh->e_phoff);
70: eh->e_shoff = swap_off(eh->e_shoff);
71: eh->e_flags = swap32(eh->e_flags);
72: eh->e_ehsize = swap16(eh->e_ehsize);
73: eh->e_phentsize = swap16(eh->e_phentsize);
74: eh->e_phnum = swap16(eh->e_phnum);
75: eh->e_shentsize = swap16(eh->e_shentsize);
76: eh->e_shnum = swap16(eh->e_shnum);
77: eh->e_shstrndx = swap16(eh->e_shstrndx);
78:
79: return (1);
80: }
81:
82: int
83: elf_fix_shdrs(Elf_Ehdr *eh, Elf_Shdr *shdr)
84: {
85: int i;
86:
87: /* nothing to do */
88: if (eh->e_ident[EI_DATA] == ELF_TARG_DATA)
89: return (0);
90:
91: for (i = eh->e_shnum; i--; shdr++) {
92: shdr->sh_name = swap32(shdr->sh_name);
93: shdr->sh_type = swap32(shdr->sh_type);
94: shdr->sh_flags = swap_xword(shdr->sh_flags);
95: shdr->sh_addr = swap_addr(shdr->sh_addr);
96: shdr->sh_offset = swap_off(shdr->sh_offset);
97: shdr->sh_size = swap_xword(shdr->sh_size);
98: shdr->sh_link = swap32(shdr->sh_link);
99: shdr->sh_info = swap32(shdr->sh_info);
100: shdr->sh_addralign = swap_xword(shdr->sh_addralign);
101: shdr->sh_entsize = swap_xword(shdr->sh_entsize);
102: }
103:
104: return (1);
105: }
106:
107: int
108: elf_fix_phdrs(Elf_Ehdr *eh, Elf_Phdr *phdr)
109: {
110: int i;
111:
112: /* nothing to do */
113: if (eh->e_ident[EI_DATA] == ELF_TARG_DATA)
114: return (0);
115:
116: for (i = eh->e_phnum; i--; phdr++) {
117: phdr->p_type = swap32(phdr->p_type);
118: phdr->p_flags = swap32(phdr->p_flags);
119: phdr->p_offset = swap_off(phdr->p_offset);
120: phdr->p_vaddr = swap_addr(phdr->p_vaddr);
121: phdr->p_paddr = swap_addr(phdr->p_paddr);
122: phdr->p_filesz = swap_xword(phdr->p_filesz);
123: phdr->p_memsz = swap_xword(phdr->p_memsz);
124: phdr->p_align = swap_xword(phdr->p_align);
125: }
126:
127: return (1);
128: }
129:
130: int
131: elf_fix_sym(Elf_Ehdr *eh, Elf_Sym *sym)
132: {
133: /* nothing to do */
134: if (eh->e_ident[EI_DATA] == ELF_TARG_DATA)
135: return (0);
136:
137: sym->st_name = swap32(sym->st_name);
138: sym->st_shndx = swap16(sym->st_shndx);
139: sym->st_value = swap_addr(sym->st_value);
140: sym->st_size = swap_xword(sym->st_size);
141:
142: return (1);
143: }
144:
145: /*
146: * Devise nlist's type from Elf_Sym.
147: * XXX this task is done as well in libc and kvm_mkdb.
148: */
149: int
150: elf2nlist(Elf_Sym *sym, Elf_Ehdr *eh, Elf_Shdr *shdr, char *shstr, struct nlist *np)
151: {
152: /* extern char *stab; */
153: const char *sn;
154:
155: if (sym->st_shndx < eh->e_shnum)
156: sn = shstr + shdr[sym->st_shndx].sh_name;
157: else
158: sn = "";
159:
160: switch(ELF_ST_TYPE(sym->st_info)) {
161: case STT_NOTYPE:
162: switch (sym->st_shndx) {
163: case SHN_UNDEF:
164: np->n_type = N_UNDF | N_EXT;
165: break;
166: case SHN_ABS:
167: np->n_type = N_ABS;
168: break;
169: case SHN_COMMON:
170: np->n_type = N_COMM;
171: break;
172: default:
173: if (sym->st_shndx >= eh->e_shnum)
174: np->n_type = N_COMM | N_EXT;
175: else if (!strcmp(sn, ELF_TEXT))
176: np->n_type = N_TEXT;
177: else if (!strcmp(sn, ELF_RODATA)) {
178: np->n_type = N_DATA;
179: np->n_other = 'r';
180: } else if (!strcmp(sn, ELF_DATA))
181: np->n_type = N_DATA;
182: else if (!strcmp(sn, ELF_BSS))
1.3 mickey 183: np->n_type = N_BSS | N_EXT;
184: else if (!strcmp(sn, ELF_SBSS))
1.1 mickey 185: np->n_type = N_BSS;
186: else
187: np->n_other = '?';
188: break;
189: }
190: break;
191:
192: case STT_FUNC:
193: np->n_type = N_TEXT;
194: if (ELF_ST_BIND(sym->st_info) == STB_WEAK) {
195: np->n_type = N_INDR;
196: np->n_other = 'W';
197: } else if (sym->st_shndx == SHN_UNDEF)
198: np->n_type = N_UNDF | N_EXT;
199: else if (strcmp(sn, ELF_TEXT)) /* XXX GNU compat */
200: np->n_other = '?';
201: break;
202:
203: case STT_OBJECT:
204: np->n_type = N_DATA;
205: if (sym->st_shndx == SHN_ABS)
206: np->n_type = N_ABS;
207: if (sym->st_shndx == SHN_COMMON)
208: np->n_type = N_COMM;
209: else if (sym->st_shndx >= eh->e_shnum)
210: break;
1.4 ! mickey 211: else if (!strcmp(sn, ELF_SBSS))
! 212: np->n_type = N_BSS;
1.1 mickey 213: else if (!strcmp(sn, ELF_BSS))
1.4 ! mickey 214: np->n_type = N_BSS | N_EXT;
1.1 mickey 215: else if (!strcmp(sn, ELF_RODATA))
216: np->n_other = 'r';
217: break;
218:
219: case STT_FILE:
220: np->n_type = N_FN | N_EXT;
221: break;
222:
223: /* XXX how about cross-nm then ? */
224: #ifdef STT_PARISC_MILLI
225: case STT_PARISC_MILLI:
226: np->n_type = N_TEXT;
227: break;
228: #endif
229: default:
230: np->n_other = '?';
231: break;
232: }
233: if (np->n_type != N_UNDF && ELF_ST_BIND(sym->st_info) != STB_LOCAL) {
234: np->n_type |= N_EXT;
235: if (np->n_other)
236: np->n_other = toupper(np->n_other);
237: }
238:
239: return (0);
240: }
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