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Commit | Line | Data |
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1da177e4 LT |
1 | /* |
2 | * a.out loader for x86-64 | |
3 | * | |
4 | * Copyright (C) 1991, 1992, 1996 Linus Torvalds | |
5 | * Hacked together by Andi Kleen | |
6 | */ | |
7 | ||
8 | #include <linux/module.h> | |
9 | ||
10 | #include <linux/time.h> | |
11 | #include <linux/kernel.h> | |
12 | #include <linux/mm.h> | |
13 | #include <linux/mman.h> | |
14 | #include <linux/a.out.h> | |
15 | #include <linux/errno.h> | |
16 | #include <linux/signal.h> | |
17 | #include <linux/string.h> | |
18 | #include <linux/fs.h> | |
19 | #include <linux/file.h> | |
20 | #include <linux/stat.h> | |
21 | #include <linux/fcntl.h> | |
22 | #include <linux/ptrace.h> | |
23 | #include <linux/user.h> | |
24 | #include <linux/slab.h> | |
25 | #include <linux/binfmts.h> | |
26 | #include <linux/personality.h> | |
27 | #include <linux/init.h> | |
e5fc3161 | 28 | #include <linux/jiffies.h> |
1da177e4 LT |
29 | |
30 | #include <asm/system.h> | |
31 | #include <asm/uaccess.h> | |
32 | #include <asm/pgalloc.h> | |
33 | #include <asm/cacheflush.h> | |
34 | #include <asm/user32.h> | |
35 | #include <asm/ia32.h> | |
36 | ||
37 | #undef WARN_OLD | |
38 | #undef CORE_DUMP /* probably broken */ | |
39 | ||
8edf8bee TG |
40 | static int load_aout_binary(struct linux_binprm *, struct pt_regs *regs); |
41 | static int load_aout_library(struct file *); | |
1da177e4 | 42 | |
44456d37 | 43 | #ifdef CORE_DUMP |
8edf8bee TG |
44 | static int aout_core_dump(long signr, struct pt_regs *regs, struct file *file, |
45 | unsigned long limit); | |
1da177e4 LT |
46 | |
47 | /* | |
48 | * fill in the user structure for a core dump.. | |
49 | */ | |
8edf8bee | 50 | static void dump_thread32(struct pt_regs *regs, struct user32 *dump) |
1da177e4 | 51 | { |
8edf8bee | 52 | u32 fs, gs; |
1da177e4 LT |
53 | |
54 | /* changed the size calculations - should hopefully work better. lbt */ | |
55 | dump->magic = CMAGIC; | |
56 | dump->start_code = 0; | |
65ea5b03 | 57 | dump->start_stack = regs->sp & ~(PAGE_SIZE - 1); |
1da177e4 | 58 | dump->u_tsize = ((unsigned long) current->mm->end_code) >> PAGE_SHIFT; |
8edf8bee TG |
59 | dump->u_dsize = ((unsigned long) |
60 | (current->mm->brk + (PAGE_SIZE-1))) >> PAGE_SHIFT; | |
1da177e4 LT |
61 | dump->u_dsize -= dump->u_tsize; |
62 | dump->u_ssize = 0; | |
8edf8bee TG |
63 | dump->u_debugreg[0] = current->thread.debugreg0; |
64 | dump->u_debugreg[1] = current->thread.debugreg1; | |
65 | dump->u_debugreg[2] = current->thread.debugreg2; | |
66 | dump->u_debugreg[3] = current->thread.debugreg3; | |
67 | dump->u_debugreg[4] = 0; | |
68 | dump->u_debugreg[5] = 0; | |
69 | dump->u_debugreg[6] = current->thread.debugreg6; | |
70 | dump->u_debugreg[7] = current->thread.debugreg7; | |
71 | ||
72 | if (dump->start_stack < 0xc0000000) { | |
73 | unsigned long tmp; | |
74 | ||
75 | tmp = (unsigned long) (0xc0000000 - dump->start_stack); | |
76 | dump->u_ssize = tmp >> PAGE_SHIFT; | |
77 | } | |
1da177e4 | 78 | |
65ea5b03 PA |
79 | dump->regs.bx = regs->bx; |
80 | dump->regs.cx = regs->cx; | |
81 | dump->regs.dx = regs->dx; | |
82 | dump->regs.si = regs->si; | |
83 | dump->regs.di = regs->di; | |
84 | dump->regs.bp = regs->bp; | |
85 | dump->regs.ax = regs->ax; | |
1da177e4 LT |
86 | dump->regs.ds = current->thread.ds; |
87 | dump->regs.es = current->thread.es; | |
b6edbb1e JF |
88 | savesegment(fs, fs); |
89 | dump->regs.fs = fs; | |
90 | savesegment(gs, gs); | |
91 | dump->regs.gs = gs; | |
65ea5b03 PA |
92 | dump->regs.orig_ax = regs->orig_ax; |
93 | dump->regs.ip = regs->ip; | |
1da177e4 | 94 | dump->regs.cs = regs->cs; |
65ea5b03 PA |
95 | dump->regs.flags = regs->flags; |
96 | dump->regs.sp = regs->sp; | |
1da177e4 LT |
97 | dump->regs.ss = regs->ss; |
98 | ||
99 | #if 1 /* FIXME */ | |
100 | dump->u_fpvalid = 0; | |
101 | #else | |
8edf8bee | 102 | dump->u_fpvalid = dump_fpu(regs, &dump->i387); |
1da177e4 LT |
103 | #endif |
104 | } | |
105 | ||
106 | #endif | |
107 | ||
108 | static struct linux_binfmt aout_format = { | |
109 | .module = THIS_MODULE, | |
110 | .load_binary = load_aout_binary, | |
111 | .load_shlib = load_aout_library, | |
44456d37 | 112 | #ifdef CORE_DUMP |
1da177e4 LT |
113 | .core_dump = aout_core_dump, |
114 | #endif | |
115 | .min_coredump = PAGE_SIZE | |
116 | }; | |
117 | ||
118 | static void set_brk(unsigned long start, unsigned long end) | |
119 | { | |
120 | start = PAGE_ALIGN(start); | |
121 | end = PAGE_ALIGN(end); | |
122 | if (end <= start) | |
123 | return; | |
124 | down_write(¤t->mm->mmap_sem); | |
125 | do_brk(start, end - start); | |
126 | up_write(¤t->mm->mmap_sem); | |
127 | } | |
128 | ||
44456d37 | 129 | #ifdef CORE_DUMP |
1da177e4 LT |
130 | /* |
131 | * These are the only things you should do on a core-file: use only these | |
132 | * macros to write out all the necessary info. | |
133 | */ | |
134 | ||
135 | static int dump_write(struct file *file, const void *addr, int nr) | |
136 | { | |
137 | return file->f_op->write(file, addr, nr, &file->f_pos) == nr; | |
138 | } | |
139 | ||
8edf8bee | 140 | #define DUMP_WRITE(addr, nr) \ |
1da177e4 LT |
141 | if (!dump_write(file, (void *)(addr), (nr))) \ |
142 | goto end_coredump; | |
143 | ||
8edf8bee TG |
144 | #define DUMP_SEEK(offset) \ |
145 | if (file->f_op->llseek) { \ | |
146 | if (file->f_op->llseek(file, (offset), 0) != (offset)) \ | |
147 | goto end_coredump; \ | |
148 | } else \ | |
149 | file->f_pos = (offset) | |
150 | ||
151 | #define START_DATA() (u.u_tsize << PAGE_SHIFT) | |
152 | #define START_STACK(u) (u.start_stack) | |
1da177e4 LT |
153 | |
154 | /* | |
155 | * Routine writes a core dump image in the current directory. | |
156 | * Currently only a stub-function. | |
157 | * | |
158 | * Note that setuid/setgid files won't make a core-dump if the uid/gid | |
159 | * changed due to the set[u|g]id. It's enforced by the "current->mm->dumpable" | |
160 | * field, which also makes sure the core-dumps won't be recursive if the | |
161 | * dumping of the process results in another error.. | |
162 | */ | |
163 | ||
8edf8bee TG |
164 | static int aout_core_dump(long signr, struct pt_regs *regs, struct file *file, |
165 | unsigned long limit) | |
1da177e4 LT |
166 | { |
167 | mm_segment_t fs; | |
168 | int has_dumped = 0; | |
169 | unsigned long dump_start, dump_size; | |
170 | struct user32 dump; | |
1da177e4 LT |
171 | |
172 | fs = get_fs(); | |
173 | set_fs(KERNEL_DS); | |
174 | has_dumped = 1; | |
175 | current->flags |= PF_DUMPCORE; | |
8edf8bee | 176 | strncpy(dump.u_comm, current->comm, sizeof(current->comm)); |
6e16d89b | 177 | dump.u_ar0 = offsetof(struct user32, regs); |
1da177e4 LT |
178 | dump.signal = signr; |
179 | dump_thread32(regs, &dump); | |
180 | ||
8edf8bee TG |
181 | /* |
182 | * If the size of the dump file exceeds the rlimit, then see | |
183 | * what would happen if we wrote the stack, but not the data | |
184 | * area. | |
185 | */ | |
7dc0b22e | 186 | if ((dump.u_dsize + dump.u_ssize + 1) * PAGE_SIZE > limit) |
1da177e4 LT |
187 | dump.u_dsize = 0; |
188 | ||
8edf8bee | 189 | /* Make sure we have enough room to write the stack and data areas. */ |
7dc0b22e | 190 | if ((dump.u_ssize + 1) * PAGE_SIZE > limit) |
1da177e4 LT |
191 | dump.u_ssize = 0; |
192 | ||
8edf8bee | 193 | /* make sure we actually have a data and stack area to dump */ |
1da177e4 | 194 | set_fs(USER_DS); |
8edf8bee TG |
195 | if (!access_ok(VERIFY_READ, (void *) (unsigned long)START_DATA(dump), |
196 | dump.u_dsize << PAGE_SHIFT)) | |
1da177e4 | 197 | dump.u_dsize = 0; |
8edf8bee TG |
198 | if (!access_ok(VERIFY_READ, (void *) (unsigned long)START_STACK(dump), |
199 | dump.u_ssize << PAGE_SHIFT)) | |
1da177e4 LT |
200 | dump.u_ssize = 0; |
201 | ||
202 | set_fs(KERNEL_DS); | |
8edf8bee TG |
203 | /* struct user */ |
204 | DUMP_WRITE(&dump, sizeof(dump)); | |
205 | /* Now dump all of the user data. Include malloced stuff as well */ | |
1da177e4 | 206 | DUMP_SEEK(PAGE_SIZE); |
8edf8bee | 207 | /* now we start writing out the user space info */ |
1da177e4 | 208 | set_fs(USER_DS); |
8edf8bee | 209 | /* Dump the data area */ |
1da177e4 LT |
210 | if (dump.u_dsize != 0) { |
211 | dump_start = START_DATA(dump); | |
212 | dump_size = dump.u_dsize << PAGE_SHIFT; | |
8edf8bee | 213 | DUMP_WRITE(dump_start, dump_size); |
1da177e4 | 214 | } |
8edf8bee | 215 | /* Now prepare to dump the stack area */ |
1da177e4 LT |
216 | if (dump.u_ssize != 0) { |
217 | dump_start = START_STACK(dump); | |
218 | dump_size = dump.u_ssize << PAGE_SHIFT; | |
8edf8bee | 219 | DUMP_WRITE(dump_start, dump_size); |
1da177e4 | 220 | } |
8edf8bee TG |
221 | /* |
222 | * Finally dump the task struct. Not be used by gdb, but | |
223 | * could be useful | |
224 | */ | |
1da177e4 | 225 | set_fs(KERNEL_DS); |
8edf8bee | 226 | DUMP_WRITE(current, sizeof(*current)); |
1da177e4 LT |
227 | end_coredump: |
228 | set_fs(fs); | |
229 | return has_dumped; | |
230 | } | |
231 | #endif | |
232 | ||
233 | /* | |
234 | * create_aout_tables() parses the env- and arg-strings in new user | |
235 | * memory and creates the pointer tables from them, and puts their | |
236 | * addresses on the "stack", returning the new stack pointer value. | |
237 | */ | |
238 | static u32 __user *create_aout_tables(char __user *p, struct linux_binprm *bprm) | |
239 | { | |
8edf8bee TG |
240 | u32 __user *argv, *envp, *sp; |
241 | int argc = bprm->argc, envc = bprm->envc; | |
1da177e4 LT |
242 | |
243 | sp = (u32 __user *) ((-(unsigned long)sizeof(u32)) & (unsigned long) p); | |
244 | sp -= envc+1; | |
245 | envp = sp; | |
246 | sp -= argc+1; | |
247 | argv = sp; | |
8edf8bee TG |
248 | put_user((unsigned long) envp, --sp); |
249 | put_user((unsigned long) argv, --sp); | |
250 | put_user(argc, --sp); | |
1da177e4 | 251 | current->mm->arg_start = (unsigned long) p; |
8edf8bee | 252 | while (argc-- > 0) { |
1da177e4 | 253 | char c; |
8edf8bee TG |
254 | |
255 | put_user((u32)(unsigned long)p, argv++); | |
1da177e4 | 256 | do { |
8edf8bee | 257 | get_user(c, p++); |
1da177e4 LT |
258 | } while (c); |
259 | } | |
74019699 | 260 | put_user(0, argv); |
1da177e4 | 261 | current->mm->arg_end = current->mm->env_start = (unsigned long) p; |
8edf8bee | 262 | while (envc-- > 0) { |
1da177e4 | 263 | char c; |
8edf8bee TG |
264 | |
265 | put_user((u32)(unsigned long)p, envp++); | |
1da177e4 | 266 | do { |
8edf8bee | 267 | get_user(c, p++); |
1da177e4 LT |
268 | } while (c); |
269 | } | |
74019699 | 270 | put_user(0, envp); |
1da177e4 LT |
271 | current->mm->env_end = (unsigned long) p; |
272 | return sp; | |
273 | } | |
274 | ||
275 | /* | |
276 | * These are the functions used to load a.out style executables and shared | |
277 | * libraries. There is no binary dependent code anywhere else. | |
278 | */ | |
8edf8bee | 279 | static int load_aout_binary(struct linux_binprm *bprm, struct pt_regs *regs) |
1da177e4 | 280 | { |
8edf8bee | 281 | unsigned long error, fd_offset, rlim; |
1da177e4 | 282 | struct exec ex; |
1da177e4 LT |
283 | int retval; |
284 | ||
285 | ex = *((struct exec *) bprm->buf); /* exec-header */ | |
286 | if ((N_MAGIC(ex) != ZMAGIC && N_MAGIC(ex) != OMAGIC && | |
287 | N_MAGIC(ex) != QMAGIC && N_MAGIC(ex) != NMAGIC) || | |
288 | N_TRSIZE(ex) || N_DRSIZE(ex) || | |
8edf8bee TG |
289 | i_size_read(bprm->file->f_path.dentry->d_inode) < |
290 | ex.a_text+ex.a_data+N_SYMSIZE(ex)+N_TXTOFF(ex)) { | |
1da177e4 LT |
291 | return -ENOEXEC; |
292 | } | |
293 | ||
294 | fd_offset = N_TXTOFF(ex); | |
295 | ||
296 | /* Check initial limits. This avoids letting people circumvent | |
297 | * size limits imposed on them by creating programs with large | |
298 | * arrays in the data or bss. | |
299 | */ | |
300 | rlim = current->signal->rlim[RLIMIT_DATA].rlim_cur; | |
301 | if (rlim >= RLIM_INFINITY) | |
302 | rlim = ~0; | |
303 | if (ex.a_data + ex.a_bss > rlim) | |
304 | return -ENOMEM; | |
305 | ||
306 | /* Flush all traces of the currently running executable */ | |
307 | retval = flush_old_exec(bprm); | |
308 | if (retval) | |
309 | return retval; | |
310 | ||
1da177e4 LT |
311 | /* OK, This is the point of no return */ |
312 | set_personality(PER_LINUX); | |
8edf8bee | 313 | set_thread_flag(TIF_IA32); |
1da177e4 | 314 | |
221af7f8 LT |
315 | setup_new_exec(bprm); |
316 | ||
317 | regs->cs = __USER32_CS; | |
318 | regs->r8 = regs->r9 = regs->r10 = regs->r11 = regs->r12 = | |
319 | regs->r13 = regs->r14 = regs->r15 = 0; | |
320 | ||
1da177e4 LT |
321 | current->mm->end_code = ex.a_text + |
322 | (current->mm->start_code = N_TXTADDR(ex)); | |
323 | current->mm->end_data = ex.a_data + | |
324 | (current->mm->start_data = N_DATADDR(ex)); | |
325 | current->mm->brk = ex.a_bss + | |
326 | (current->mm->start_brk = N_BSSADDR(ex)); | |
327 | current->mm->free_area_cache = TASK_UNMAPPED_BASE; | |
1363c3cd | 328 | current->mm->cached_hole_size = 0; |
1da177e4 | 329 | |
1da177e4 | 330 | current->mm->mmap = NULL; |
a6f76f23 | 331 | install_exec_creds(bprm); |
8edf8bee | 332 | current->flags &= ~PF_FORKNOEXEC; |
1da177e4 LT |
333 | |
334 | if (N_MAGIC(ex) == OMAGIC) { | |
335 | unsigned long text_addr, map_size; | |
336 | loff_t pos; | |
337 | ||
338 | text_addr = N_TXTADDR(ex); | |
339 | ||
340 | pos = 32; | |
341 | map_size = ex.a_text+ex.a_data; | |
342 | ||
343 | down_write(¤t->mm->mmap_sem); | |
344 | error = do_brk(text_addr & PAGE_MASK, map_size); | |
345 | up_write(¤t->mm->mmap_sem); | |
346 | ||
347 | if (error != (text_addr & PAGE_MASK)) { | |
348 | send_sig(SIGKILL, current, 0); | |
349 | return error; | |
350 | } | |
351 | ||
52d522f5 AK |
352 | error = bprm->file->f_op->read(bprm->file, |
353 | (char __user *)text_addr, | |
1da177e4 LT |
354 | ex.a_text+ex.a_data, &pos); |
355 | if ((signed long)error < 0) { | |
356 | send_sig(SIGKILL, current, 0); | |
357 | return error; | |
358 | } | |
8edf8bee | 359 | |
1da177e4 LT |
360 | flush_icache_range(text_addr, text_addr+ex.a_text+ex.a_data); |
361 | } else { | |
362 | #ifdef WARN_OLD | |
363 | static unsigned long error_time, error_time2; | |
364 | if ((ex.a_text & 0xfff || ex.a_data & 0xfff) && | |
e5fc3161 JL |
365 | (N_MAGIC(ex) != NMAGIC) && |
366 | time_after(jiffies, error_time2 + 5*HZ)) { | |
1da177e4 LT |
367 | printk(KERN_NOTICE "executable not page aligned\n"); |
368 | error_time2 = jiffies; | |
369 | } | |
370 | ||
371 | if ((fd_offset & ~PAGE_MASK) != 0 && | |
e5fc3161 | 372 | time_after(jiffies, error_time + 5*HZ)) { |
8edf8bee TG |
373 | printk(KERN_WARNING |
374 | "fd_offset is not page aligned. Please convert " | |
375 | "program: %s\n", | |
c941192a | 376 | bprm->file->f_path.dentry->d_name.name); |
1da177e4 LT |
377 | error_time = jiffies; |
378 | } | |
379 | #endif | |
380 | ||
8edf8bee | 381 | if (!bprm->file->f_op->mmap || (fd_offset & ~PAGE_MASK) != 0) { |
1da177e4 | 382 | loff_t pos = fd_offset; |
8edf8bee | 383 | |
1da177e4 LT |
384 | down_write(¤t->mm->mmap_sem); |
385 | do_brk(N_TXTADDR(ex), ex.a_text+ex.a_data); | |
386 | up_write(¤t->mm->mmap_sem); | |
52d522f5 AK |
387 | bprm->file->f_op->read(bprm->file, |
388 | (char __user *)N_TXTADDR(ex), | |
1da177e4 LT |
389 | ex.a_text+ex.a_data, &pos); |
390 | flush_icache_range((unsigned long) N_TXTADDR(ex), | |
391 | (unsigned long) N_TXTADDR(ex) + | |
392 | ex.a_text+ex.a_data); | |
393 | goto beyond_if; | |
394 | } | |
395 | ||
396 | down_write(¤t->mm->mmap_sem); | |
397 | error = do_mmap(bprm->file, N_TXTADDR(ex), ex.a_text, | |
8edf8bee TG |
398 | PROT_READ | PROT_EXEC, |
399 | MAP_FIXED | MAP_PRIVATE | MAP_DENYWRITE | | |
400 | MAP_EXECUTABLE | MAP_32BIT, | |
401 | fd_offset); | |
1da177e4 LT |
402 | up_write(¤t->mm->mmap_sem); |
403 | ||
404 | if (error != N_TXTADDR(ex)) { | |
405 | send_sig(SIGKILL, current, 0); | |
406 | return error; | |
407 | } | |
408 | ||
409 | down_write(¤t->mm->mmap_sem); | |
8edf8bee | 410 | error = do_mmap(bprm->file, N_DATADDR(ex), ex.a_data, |
1da177e4 | 411 | PROT_READ | PROT_WRITE | PROT_EXEC, |
8edf8bee TG |
412 | MAP_FIXED | MAP_PRIVATE | MAP_DENYWRITE | |
413 | MAP_EXECUTABLE | MAP_32BIT, | |
1da177e4 LT |
414 | fd_offset + ex.a_text); |
415 | up_write(¤t->mm->mmap_sem); | |
416 | if (error != N_DATADDR(ex)) { | |
417 | send_sig(SIGKILL, current, 0); | |
418 | return error; | |
419 | } | |
420 | } | |
421 | beyond_if: | |
422 | set_binfmt(&aout_format); | |
423 | ||
424 | set_brk(current->mm->start_brk, current->mm->brk); | |
425 | ||
b6a2fea3 | 426 | retval = setup_arg_pages(bprm, IA32_STACK_TOP, EXSTACK_DEFAULT); |
8edf8bee TG |
427 | if (retval < 0) { |
428 | /* Someone check-me: is this error path enough? */ | |
429 | send_sig(SIGKILL, current, 0); | |
1da177e4 LT |
430 | return retval; |
431 | } | |
432 | ||
433 | current->mm->start_stack = | |
434 | (unsigned long)create_aout_tables((char __user *)bprm->p, bprm); | |
435 | /* start thread */ | |
b6edbb1e JF |
436 | loadsegment(fs, 0); |
437 | loadsegment(ds, __USER32_DS); | |
438 | loadsegment(es, __USER32_DS); | |
8edf8bee | 439 | load_gs_index(0); |
65ea5b03 PA |
440 | (regs)->ip = ex.a_entry; |
441 | (regs)->sp = current->mm->start_stack; | |
442 | (regs)->flags = 0x200; | |
1da177e4 LT |
443 | (regs)->cs = __USER32_CS; |
444 | (regs)->ss = __USER32_DS; | |
f891dd18 AK |
445 | regs->r8 = regs->r9 = regs->r10 = regs->r11 = |
446 | regs->r12 = regs->r13 = regs->r14 = regs->r15 = 0; | |
1da177e4 | 447 | set_fs(USER_DS); |
1da177e4 LT |
448 | return 0; |
449 | } | |
450 | ||
451 | static int load_aout_library(struct file *file) | |
452 | { | |
8edf8bee TG |
453 | struct inode *inode; |
454 | unsigned long bss, start_addr, len, error; | |
1da177e4 LT |
455 | int retval; |
456 | struct exec ex; | |
457 | ||
c941192a | 458 | inode = file->f_path.dentry->d_inode; |
1da177e4 LT |
459 | |
460 | retval = -ENOEXEC; | |
461 | error = kernel_read(file, 0, (char *) &ex, sizeof(ex)); | |
462 | if (error != sizeof(ex)) | |
463 | goto out; | |
464 | ||
465 | /* We come in here for the regular a.out style of shared libraries */ | |
466 | if ((N_MAGIC(ex) != ZMAGIC && N_MAGIC(ex) != QMAGIC) || N_TRSIZE(ex) || | |
467 | N_DRSIZE(ex) || ((ex.a_entry & 0xfff) && N_MAGIC(ex) == ZMAGIC) || | |
8edf8bee TG |
468 | i_size_read(inode) < |
469 | ex.a_text+ex.a_data+N_SYMSIZE(ex)+N_TXTOFF(ex)) { | |
1da177e4 LT |
470 | goto out; |
471 | } | |
472 | ||
473 | if (N_FLAGS(ex)) | |
474 | goto out; | |
475 | ||
476 | /* For QMAGIC, the starting address is 0x20 into the page. We mask | |
477 | this off to get the starting address for the page */ | |
478 | ||
479 | start_addr = ex.a_entry & 0xfffff000; | |
480 | ||
481 | if ((N_TXTOFF(ex) & ~PAGE_MASK) != 0) { | |
482 | loff_t pos = N_TXTOFF(ex); | |
483 | ||
484 | #ifdef WARN_OLD | |
485 | static unsigned long error_time; | |
e5fc3161 | 486 | if (time_after(jiffies, error_time + 5*HZ)) { |
8edf8bee TG |
487 | printk(KERN_WARNING |
488 | "N_TXTOFF is not page aligned. Please convert " | |
489 | "library: %s\n", | |
c941192a | 490 | file->f_path.dentry->d_name.name); |
1da177e4 LT |
491 | error_time = jiffies; |
492 | } | |
493 | #endif | |
494 | down_write(¤t->mm->mmap_sem); | |
495 | do_brk(start_addr, ex.a_text + ex.a_data + ex.a_bss); | |
496 | up_write(¤t->mm->mmap_sem); | |
8edf8bee | 497 | |
52d522f5 | 498 | file->f_op->read(file, (char __user *)start_addr, |
1da177e4 LT |
499 | ex.a_text + ex.a_data, &pos); |
500 | flush_icache_range((unsigned long) start_addr, | |
8edf8bee TG |
501 | (unsigned long) start_addr + ex.a_text + |
502 | ex.a_data); | |
1da177e4 LT |
503 | |
504 | retval = 0; | |
505 | goto out; | |
506 | } | |
507 | /* Now use mmap to map the library into memory. */ | |
508 | down_write(¤t->mm->mmap_sem); | |
509 | error = do_mmap(file, start_addr, ex.a_text + ex.a_data, | |
510 | PROT_READ | PROT_WRITE | PROT_EXEC, | |
511 | MAP_FIXED | MAP_PRIVATE | MAP_DENYWRITE | MAP_32BIT, | |
512 | N_TXTOFF(ex)); | |
513 | up_write(¤t->mm->mmap_sem); | |
514 | retval = error; | |
515 | if (error != start_addr) | |
516 | goto out; | |
517 | ||
518 | len = PAGE_ALIGN(ex.a_text + ex.a_data); | |
519 | bss = ex.a_text + ex.a_data + ex.a_bss; | |
520 | if (bss > len) { | |
521 | down_write(¤t->mm->mmap_sem); | |
522 | error = do_brk(start_addr + len, bss - len); | |
523 | up_write(¤t->mm->mmap_sem); | |
524 | retval = error; | |
525 | if (error != start_addr + len) | |
526 | goto out; | |
527 | } | |
528 | retval = 0; | |
529 | out: | |
530 | return retval; | |
531 | } | |
532 | ||
533 | static int __init init_aout_binfmt(void) | |
534 | { | |
535 | return register_binfmt(&aout_format); | |
536 | } | |
537 | ||
538 | static void __exit exit_aout_binfmt(void) | |
539 | { | |
540 | unregister_binfmt(&aout_format); | |
541 | } | |
542 | ||
543 | module_init(init_aout_binfmt); | |
544 | module_exit(exit_aout_binfmt); | |
545 | MODULE_LICENSE("GPL"); |