Annotation of src/lib/libc/gen/nlist_coff.c, Revision 1.4
1.4 ! cgd 1: /* $NetBSD: nlist_coff.c,v 1.3 2000/06/14 06:49:06 cgd Exp $ */
1.1 msaitoh 2:
3: /*
1.4 ! cgd 4: * Copyright (c) 1996 Christopher G. Demetriou
! 5: * All rights reserved.
! 6: *
1.1 msaitoh 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: * 3. All advertising materials mentioning features or use of this software
16: * must display the following acknowledgement:
1.4 ! cgd 17: * This product includes software developed for the
! 18: * NetBSD Project. See http://www.netbsd.org/ for
! 19: * information about NetBSD.
1.1 msaitoh 20: * 4. The name of the author may not be used to endorse or promote products
1.4 ! cgd 21: * derived from this software without specific prior written permission.
! 22: *
1.1 msaitoh 23: * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
24: * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
25: * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
26: * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
27: * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
28: * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
29: * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
30: * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
31: * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
32: * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
1.4 ! cgd 33: *
! 34: * <<Id: LICENSE,v 1.2 2000/06/14 15:57:33 cgd Exp>>
1.1 msaitoh 35: */
36:
37: #include <sys/cdefs.h>
38: #if defined(LIBC_SCCS) && !defined(lint)
1.4 ! cgd 39: __RCSID("$NetBSD: nlist_coff.c,v 1.3 2000/06/14 06:49:06 cgd Exp $");
1.1 msaitoh 40: #endif /* LIBC_SCCS and not lint */
41:
42: #include "namespace.h"
43: #include <sys/param.h>
44: #include <sys/mman.h>
45: #include <sys/stat.h>
46: #include <sys/file.h>
47:
48: #include <assert.h>
49: #include <errno.h>
50: #include <stdio.h>
51: #include <string.h>
52: #include <unistd.h>
53: #include <a.out.h> /* for 'struct nlist' declaration */
54:
55: #include "nlist_private.h"
56: #ifdef NLIST_COFF
57: #include <sys/exec_coff.h>
58: #endif
59:
60: #ifdef NLIST_COFF
61: #define check(off, size) ((off < 0) || (off + size > mappedsize))
1.2 simonb 62: #define BAD do { rv = -1; goto out; } while (/*CONSTCOND*/0)
63: #define BADUNMAP do { rv = -1; goto unmap; } while (/*CONSTCOND*/0)
1.1 msaitoh 64:
65: #define ES_LEN 18
66: struct coff_extsym {
67: union {
68: char u_name[8];
69: struct {
70: int u_zero;
71: int u_offset;
72: } s;
73: } u;
74: int32_t es_value;
75: int16_t es_scnum;
76: int16_t es_type;
77: int8_t es_class;
78: int8_t es_numaux;
79: };
80: #define es_name u.u_name
81: #define es_zero u.s.u_zero
82: #define es_offset u.s.u_offset
83:
84: int
85: __fdnlist_coff(fd, list)
86: int fd;
87: struct nlist *list;
88: {
89: struct nlist *p;
90: struct coff_filehdr *filehdrp;
91: struct stat st;
92: char *mappedfile;
93: size_t mappedsize;
94: u_long symoff, extstroff;
95: int rv, nent;
96: long i, nesyms;
97:
98: _DIAGASSERT(fd != -1);
99: _DIAGASSERT(list != NULL);
100:
101: rv = -1;
102:
103: /*
104: * If we can't fstat() the file, something bad is going on.
105: */
106: if (fstat(fd, &st) < 0)
107: BAD;
108:
109: /*
110: * Map the file in its entirety.
111: */
112: if (st.st_size > SIZE_T_MAX) {
113: errno = EFBIG;
114: BAD;
115: }
116: mappedsize = st.st_size;
117: mappedfile = mmap(NULL, mappedsize, PROT_READ, MAP_PRIVATE|MAP_FILE,
118: fd, 0);
119: if (mappedfile == (char *)-1)
120: BAD;
121:
122: /*
123: * Make sure we can access the executable's header
124: * directly, and make sure the recognize the executable
125: * as an COFF binary.
126: */
127: if (check(0, sizeof *filehdrp))
128: BADUNMAP;
129: filehdrp = (struct coff_filehdr *)&mappedfile[0];
130:
131: if (COFF_BADMAG(filehdrp))
132: BADUNMAP;
133:
134: /*
135: * Find the symbol list.
136: */
137: symoff = filehdrp->f_symptr;
138: nesyms = filehdrp->f_nsyms;
139:
140: if (check(symoff, ES_LEN * nesyms))
141: BADUNMAP;
142: extstroff = symoff + ES_LEN * nesyms;
143:
144: nent = 0;
145: for (p = list; !ISLAST(p); ++p) {
146: p->n_type = 0;
147: p->n_other = 0;
148: p->n_desc = 0;
149: p->n_value = 0;
150: ++nent;
151: }
152:
153: for (i = 0; i < nesyms; i++) {
154: char *symtabname;
155: char *nlistname;
156: struct coff_extsym esym;
157: char name[10];
158:
159: memcpy(&esym, &mappedfile[symoff + ES_LEN * i], ES_LEN);
160: if (esym.es_numaux != 0) {
161: i += esym.es_numaux; /* XXX Skip aux entry */
162: continue;
163: }
164:
165: if (esym.es_zero != 0) {
166: memcpy(name, esym.es_name, 8);
167: name[8] = 0;
168: symtabname = name;
169: } else if (esym.es_offset != 0)
170: symtabname = &mappedfile[extstroff + esym.es_offset];
171: else
172: continue;
173:
174: for (p = list; !ISLAST(p); p++) {
175: nlistname = p->n_un.n_name;
176: if (!strcmp(symtabname, nlistname)) {
177: /*
178: * Translate (roughly) from COFF to nlist
179: */
180: p->n_value = esym.es_value;
181: p->n_type = N_EXT; /* XXX */
182: p->n_desc = 0; /* XXX */
183: p->n_other = 0; /* XXX */
184:
185: if (--nent <= 0)
186: goto done;
187: break; /* into next run of outer loop */
188: }
189: }
190: }
191:
192: done:
193: rv = nent;
194: unmap:
195: munmap(mappedfile, mappedsize);
196: out:
197: return (rv);
198: }
199:
200: #endif /* NLIST_COFF */
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