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