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90c075bb PR |
1 | /* |
2 | * Copyright (c) 1993 Paul Kranenburg | |
15637ed4 RG |
3 | * All rights reserved. |
4 | * | |
5 | * Redistribution and use in source and binary forms, with or without | |
6 | * modification, are permitted provided that the following conditions | |
7 | * are met: | |
8 | * 1. Redistributions of source code must retain the above copyright | |
9 | * notice, this list of conditions and the following disclaimer. | |
10 | * 2. Redistributions in binary form must reproduce the above copyright | |
11 | * notice, this list of conditions and the following disclaimer in the | |
12 | * documentation and/or other materials provided with the distribution. | |
13 | * 3. All advertising materials mentioning features or use of this software | |
14 | * must display the following acknowledgement: | |
90c075bb PR |
15 | * This product includes software developed by Paul Kranenburg. |
16 | * 4. The name of the author may not be used to endorse or promote products | |
8b0da803 | 17 | * derived from this software without specific prior written permission |
90c075bb PR |
18 | * |
19 | * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR | |
20 | * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES | |
21 | * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. | |
22 | * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, | |
23 | * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT | |
24 | * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, | |
25 | * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY | |
26 | * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT | |
27 | * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF | |
28 | * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. | |
15637ed4 | 29 | * |
5a600fed | 30 | * $Id: crt0.c,v 1.8 1994/02/13 20:53:11 jkh Exp $ |
15637ed4 RG |
31 | */ |
32 | ||
90c075bb | 33 | |
15637ed4 | 34 | #if defined(LIBC_SCCS) && !defined(lint) |
90c075bb | 35 | static char sccsid[] = "%W% (Erasmus) %G%"; |
15637ed4 RG |
36 | #endif /* LIBC_SCCS and not lint */ |
37 | ||
90c075bb PR |
38 | extern void exit(); |
39 | int _callmain(); | |
15637ed4 | 40 | |
90c075bb PR |
41 | #include <sys/param.h> |
42 | ||
43 | #ifdef DYNAMIC | |
44 | #include <sys/types.h> | |
45 | #include <sys/syscall.h> | |
46 | #include <a.out.h> | |
47 | #ifndef N_GETMAGIC | |
48 | #define N_GETMAGIC(x) ((x).a_magic) | |
49 | #endif | |
50 | #ifndef N_BSSADDR | |
51 | #define N_BSSADDR(x) (N_DATADDR(x)+(x).a_data) | |
52 | #endif | |
53 | #include <sys/mman.h> | |
54 | #ifdef sun | |
55 | #define MAP_COPY MAP_PRIVATE | |
56 | #define MAP_FILE 0 | |
57 | #define MAP_ANON 0 | |
58 | #endif | |
59 | #include <link.h> | |
60 | ||
8b0da803 JH |
61 | extern struct _dynamic _DYNAMIC; |
62 | static struct ld_entry *ld_entry; | |
90c075bb PR |
63 | static void __do_dynamic_link (); |
64 | static char *_getenv(); | |
65 | static int _strncmp(); | |
66 | ||
90c075bb PR |
67 | #ifdef sun |
68 | #define LDSO "/usr/lib/ld.so" | |
69 | #endif | |
70 | #ifdef BSD | |
71 | #define LDSO "/usr/libexec/ld.so" | |
72 | #endif | |
c90fc599 | 73 | |
90c075bb | 74 | #endif /* DYNAMIC */ |
15637ed4 | 75 | |
90c075bb PR |
76 | static char *_strrchr(); |
77 | ||
78 | char **environ; | |
79 | ||
80 | #ifdef BSD | |
15637ed4 RG |
81 | extern unsigned char etext; |
82 | extern unsigned char eprol asm ("eprol"); | |
83 | extern start() asm("start"); | |
84 | extern mcount() asm ("mcount"); | |
85 | ||
90c075bb PR |
86 | int errno; |
87 | static char empty[1]; | |
88 | char *__progname = empty; | |
89 | #endif | |
90 | ||
91 | /* | |
92 | * We need these system calls, but can't use library stubs | |
93 | */ | |
94 | #define _exit(v) __syscall(SYS_exit, (v)) | |
95 | #define open(name, f, m) __syscall(SYS_open, (name), (f), (m)) | |
96 | #define close(fd) __syscall(SYS_close, (fd)) | |
97 | #define read(fd, s, n) __syscall(SYS_read, (fd), (s), (n)) | |
98 | #define write(fd, s, n) __syscall(SYS_write, (fd), (s), (n)) | |
99 | #define dup(fd) __syscall(SYS_dup, (fd)) | |
100 | #define dup2(fd, fdnew) __syscall(SYS_dup2, (fd), (fdnew)) | |
101 | #ifdef sun | |
102 | #define mmap(addr, len, prot, flags, fd, off) \ | |
103 | __syscall(SYS_mmap, (addr), (len), (prot), _MAP_NEW|(flags), (fd), (off)) | |
104 | #else | |
105 | #define mmap(addr, len, prot, flags, fd, off) \ | |
106 | __syscall(SYS_mmap, (addr), (len), (prot), (flags), (fd), (off)) | |
107 | #endif | |
108 | ||
109 | #define _FATAL(str) \ | |
110 | write(2, str, sizeof(str)), \ | |
111 | _exit(1); | |
112 | ||
113 | ||
15637ed4 RG |
114 | start() |
115 | { | |
116 | struct kframe { | |
117 | int kargc; | |
118 | char *kargv[1]; /* size depends on kargc */ | |
119 | char kargstr[1]; /* size varies */ | |
120 | char kenvstr[1]; /* size varies */ | |
121 | }; | |
122 | /* | |
123 | * ALL REGISTER VARIABLES!!! | |
124 | */ | |
125 | register struct kframe *kfp; | |
126 | register char **targv; | |
127 | register char **argv; | |
128 | extern void _mcleanup(); | |
90c075bb PR |
129 | #ifdef DYNAMIC |
130 | volatile caddr_t x; | |
131 | #endif | |
15637ed4 RG |
132 | |
133 | #ifdef lint | |
134 | kfp = 0; | |
135 | initcode = initcode = 0; | |
90c075bb | 136 | #else /* not lint */ |
15637ed4 RG |
137 | /* just above the saved frame pointer */ |
138 | asm ("lea 4(%%ebp), %0" : "=r" (kfp) ); | |
90c075bb | 139 | #endif /* not lint */ |
15637ed4 RG |
140 | for (argv = targv = &kfp->kargv[0]; *targv++; /* void */) |
141 | /* void */ ; | |
142 | if (targv >= (char **)(*argv)) | |
143 | --targv; | |
144 | environ = targv; | |
90c075bb | 145 | |
8b0da803 JH |
146 | if (argv[0]) |
147 | if ((__progname = _strrchr(argv[0], '/')) == NULL) | |
148 | __progname = argv[0]; | |
149 | else | |
150 | ++__progname; | |
151 | ||
90c075bb | 152 | #ifdef DYNAMIC |
1781f4aa | 153 | /* ld(1) convention: if DYNAMIC = 0 then statically linked */ |
90c075bb PR |
154 | #ifdef stupid_gcc |
155 | if (&_DYNAMIC) | |
156 | __do_dynamic_link(); | |
157 | #else | |
158 | x = (caddr_t)&_DYNAMIC; | |
159 | if (x) | |
160 | __do_dynamic_link(); | |
161 | #endif | |
162 | #endif /* DYNAMIC */ | |
163 | ||
15637ed4 RG |
164 | asm("eprol:"); |
165 | ||
166 | #ifdef MCRT0 | |
167 | atexit(_mcleanup); | |
168 | monstartup(&eprol, &etext); | |
169 | #endif MCRT0 | |
8b0da803 | 170 | |
90c075bb | 171 | asm ("__callmain:"); /* Defined for the benefit of debuggers */ |
15637ed4 RG |
172 | exit(main(kfp->kargc, argv, environ)); |
173 | } | |
90c075bb PR |
174 | |
175 | #ifdef DYNAMIC | |
176 | static void | |
177 | __do_dynamic_link () | |
178 | { | |
179 | struct crt_ldso crt; | |
180 | struct exec hdr; | |
181 | char *ldso; | |
182 | int dupzfd; | |
8b0da803 | 183 | int (*entry)(); |
90c075bb | 184 | |
1781f4aa | 185 | #ifdef DEBUG |
90c075bb PR |
186 | /* Provision for alternate ld.so - security risk! */ |
187 | if (!(ldso = _getenv("LDSO"))) | |
1781f4aa | 188 | #endif |
90c075bb PR |
189 | ldso = LDSO; |
190 | ||
191 | crt.crt_ldfd = open(ldso, 0, 0); | |
192 | if (crt.crt_ldfd == -1) { | |
193 | _FATAL("No ld.so\n"); | |
194 | } | |
195 | ||
196 | /* Read LDSO exec header */ | |
197 | if (read(crt.crt_ldfd, &hdr, sizeof hdr) < sizeof hdr) { | |
198 | _FATAL("Failure reading ld.so\n"); | |
199 | } | |
5a600fed | 200 | if ((N_GETMAGIC_NET(hdr) != ZMAGIC) && (N_GETMAGIC(hdr) != QMAGIC)) { |
90c075bb PR |
201 | _FATAL("Bad magic: ld.so\n"); |
202 | } | |
203 | ||
90c075bb PR |
204 | /* We use MAP_ANON */ |
205 | crt.crt_dzfd = -1; | |
90c075bb PR |
206 | |
207 | /* Map in ld.so */ | |
5e358090 | 208 | crt.crt_ba = mmap(0, hdr.a_text, |
90c075bb PR |
209 | PROT_READ|PROT_EXEC, |
210 | MAP_FILE|MAP_COPY, | |
211 | crt.crt_ldfd, N_TXTOFF(hdr)); | |
212 | if (crt.crt_ba == -1) { | |
213 | _FATAL("Cannot map ld.so\n"); | |
214 | } | |
215 | ||
216 | #ifdef BSD | |
217 | /* !!! | |
218 | * This is gross, ld.so is a ZMAGIC a.out, but has `sizeof(hdr)' for | |
219 | * an entry point and not at PAGSIZ as the N_*ADDR macros assume. | |
220 | */ | |
221 | #undef N_DATADDR | |
222 | #undef N_BSSADDR | |
223 | #define N_DATADDR(x) ((x).a_text) | |
224 | #define N_BSSADDR(x) ((x).a_text + (x).a_data) | |
225 | #endif | |
226 | ||
227 | /* Map in data segment of ld.so writable */ | |
228 | if (mmap(crt.crt_ba+N_DATADDR(hdr), hdr.a_data, | |
5e358090 | 229 | PROT_READ|PROT_WRITE, |
90c075bb PR |
230 | MAP_FIXED|MAP_FILE|MAP_COPY, |
231 | crt.crt_ldfd, N_DATOFF(hdr)) == -1) { | |
232 | _FATAL("Cannot map ld.so\n"); | |
233 | } | |
234 | ||
235 | /* Map bss segment of ld.so zero */ | |
236 | if (hdr.a_bss && mmap(crt.crt_ba+N_BSSADDR(hdr), hdr.a_bss, | |
5e358090 | 237 | PROT_READ|PROT_WRITE, |
90c075bb PR |
238 | MAP_FIXED|MAP_ANON|MAP_COPY, |
239 | crt.crt_dzfd, 0) == -1) { | |
240 | _FATAL("Cannot map ld.so\n"); | |
241 | } | |
242 | ||
243 | crt.crt_dp = &_DYNAMIC; | |
244 | crt.crt_ep = environ; | |
245 | crt.crt_bp = (caddr_t)_callmain; | |
8b0da803 | 246 | crt.crt_prog = __progname; |
90c075bb | 247 | |
8b0da803 JH |
248 | entry = (int (*)())(crt.crt_ba + sizeof hdr); |
249 | if ((*entry)(CRT_VERSION_BSD_3, &crt) == -1) { | |
250 | _FATAL("ld.so failed\n"); | |
90c075bb | 251 | } |
8b0da803 JH |
252 | |
253 | ld_entry = _DYNAMIC.d_entry; | |
90c075bb PR |
254 | return; |
255 | } | |
256 | ||
8b0da803 JH |
257 | /* |
258 | * DL stubs | |
259 | */ | |
260 | ||
261 | void * | |
262 | dlopen(name, mode) | |
263 | char *name; | |
264 | int mode; | |
90c075bb | 265 | { |
8b0da803 JH |
266 | if (ld_entry == NULL) |
267 | return NULL; | |
268 | ||
269 | return (ld_entry->dlopen)(name, mode); | |
270 | } | |
271 | ||
272 | int | |
273 | dlclose(fd) | |
274 | void *fd; | |
275 | { | |
276 | if (ld_entry == NULL) | |
277 | return -1; | |
278 | ||
279 | return (ld_entry->dlclose)(fd); | |
280 | } | |
281 | ||
282 | void * | |
283 | dlsym(fd, name) | |
284 | void *fd; | |
285 | char *name; | |
286 | { | |
287 | if (ld_entry == NULL) | |
288 | return NULL; | |
289 | ||
290 | return (ld_entry->dlsym)(fd, name); | |
291 | } | |
292 | ||
293 | int | |
294 | dlctl(fd, cmd, arg) | |
295 | void *fd, *arg; | |
296 | int cmd; | |
297 | { | |
298 | if (ld_entry == NULL) | |
299 | return -1; | |
300 | ||
301 | return (ld_entry->dlctl)(fd, cmd, arg); | |
90c075bb | 302 | } |
15637ed4 | 303 | |
15637ed4 | 304 | /* |
90c075bb | 305 | * Support routines |
15637ed4 | 306 | */ |
90c075bb PR |
307 | |
308 | static int | |
309 | _strncmp(s1, s2, n) | |
310 | register char *s1, *s2; | |
311 | register n; | |
15637ed4 RG |
312 | { |
313 | ||
90c075bb PR |
314 | if (n == 0) |
315 | return (0); | |
316 | do { | |
317 | if (*s1 != *s2++) | |
318 | return (*(unsigned char *)s1 - *(unsigned char *)--s2); | |
319 | if (*s1++ == 0) | |
320 | break; | |
321 | } while (--n != 0); | |
322 | return (0); | |
15637ed4 RG |
323 | } |
324 | ||
90c075bb PR |
325 | static char * |
326 | _getenv(name) | |
327 | register char *name; | |
328 | { | |
329 | extern char **environ; | |
330 | register int len; | |
331 | register char **P, *C; | |
332 | ||
333 | for (C = name, len = 0; *C && *C != '='; ++C, ++len); | |
334 | for (P = environ; *P; ++P) | |
335 | if (!_strncmp(*P, name, len)) | |
336 | if (*(C = *P + len) == '=') { | |
337 | return(++C); | |
338 | } | |
339 | return (char *)0; | |
340 | } | |
341 | ||
90c075bb PR |
342 | asm(" ___syscall:"); |
343 | asm(" popl %ecx"); | |
344 | asm(" popl %eax"); | |
345 | asm(" pushl %ecx"); | |
346 | asm(" .byte 0x9a"); | |
347 | asm(" .long 0"); | |
348 | asm(" .word 7"); | |
349 | asm(" pushl %ecx"); | |
350 | asm(" jc 1f"); | |
351 | asm(" ret"); | |
352 | asm(" 1:"); | |
353 | asm(" movl $-1,%eax"); | |
354 | asm(" ret"); | |
90c075bb PR |
355 | |
356 | #endif /* DYNAMIC */ | |
357 | ||
358 | static char * | |
359 | _strrchr(p, ch) | |
360 | register char *p, ch; | |
361 | { | |
362 | register char *save; | |
363 | ||
364 | for (save = NULL;; ++p) { | |
365 | if (*p == ch) | |
366 | save = (char *)p; | |
367 | if (!*p) | |
368 | return(save); | |
369 | } | |
370 | /* NOTREACHED */ | |
371 | } | |
372 | ||
373 | #ifdef MCRT0 | |
374 | asm (" .text"); | |
375 | asm ("_eprol:"); | |
376 | #endif |