x86: get rid of the insane TIF_ABI_PENDING bit
[~shefty/rdma-dev.git] / arch / x86 / ia32 / ia32_aout.c
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 #include <linux/jiffies.h>
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
40 static int load_aout_binary(struct linux_binprm *, struct pt_regs *regs);
41 static int load_aout_library(struct file *);
42
43 #ifdef CORE_DUMP
44 static int aout_core_dump(long signr, struct pt_regs *regs, struct file *file,
45                           unsigned long limit);
46
47 /*
48  * fill in the user structure for a core dump..
49  */
50 static void dump_thread32(struct pt_regs *regs, struct user32 *dump)
51 {
52         u32 fs, gs;
53
54 /* changed the size calculations - should hopefully work better. lbt */
55         dump->magic = CMAGIC;
56         dump->start_code = 0;
57         dump->start_stack = regs->sp & ~(PAGE_SIZE - 1);
58         dump->u_tsize = ((unsigned long) current->mm->end_code) >> PAGE_SHIFT;
59         dump->u_dsize = ((unsigned long)
60                          (current->mm->brk + (PAGE_SIZE-1))) >> PAGE_SHIFT;
61         dump->u_dsize -= dump->u_tsize;
62         dump->u_ssize = 0;
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         }
78
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;
86         dump->regs.ds = current->thread.ds;
87         dump->regs.es = current->thread.es;
88         savesegment(fs, fs);
89         dump->regs.fs = fs;
90         savesegment(gs, gs);
91         dump->regs.gs = gs;
92         dump->regs.orig_ax = regs->orig_ax;
93         dump->regs.ip = regs->ip;
94         dump->regs.cs = regs->cs;
95         dump->regs.flags = regs->flags;
96         dump->regs.sp = regs->sp;
97         dump->regs.ss = regs->ss;
98
99 #if 1 /* FIXME */
100         dump->u_fpvalid = 0;
101 #else
102         dump->u_fpvalid = dump_fpu(regs, &dump->i387);
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,
112 #ifdef CORE_DUMP
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(&current->mm->mmap_sem);
125         do_brk(start, end - start);
126         up_write(&current->mm->mmap_sem);
127 }
128
129 #ifdef CORE_DUMP
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
140 #define DUMP_WRITE(addr, nr)                         \
141         if (!dump_write(file, (void *)(addr), (nr))) \
142                 goto end_coredump;
143
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)
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
164 static int aout_core_dump(long signr, struct pt_regs *regs, struct file *file,
165                           unsigned long limit)
166 {
167         mm_segment_t fs;
168         int has_dumped = 0;
169         unsigned long dump_start, dump_size;
170         struct user32 dump;
171
172         fs = get_fs();
173         set_fs(KERNEL_DS);
174         has_dumped = 1;
175         current->flags |= PF_DUMPCORE;
176         strncpy(dump.u_comm, current->comm, sizeof(current->comm));
177         dump.u_ar0 = offsetof(struct user32, regs);
178         dump.signal = signr;
179         dump_thread32(regs, &dump);
180
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          */
186         if ((dump.u_dsize + dump.u_ssize + 1) * PAGE_SIZE > limit)
187                 dump.u_dsize = 0;
188
189         /* Make sure we have enough room to write the stack and data areas. */
190         if ((dump.u_ssize + 1) * PAGE_SIZE > limit)
191                 dump.u_ssize = 0;
192
193         /* make sure we actually have a data and stack area to dump */
194         set_fs(USER_DS);
195         if (!access_ok(VERIFY_READ, (void *) (unsigned long)START_DATA(dump),
196                        dump.u_dsize << PAGE_SHIFT))
197                 dump.u_dsize = 0;
198         if (!access_ok(VERIFY_READ, (void *) (unsigned long)START_STACK(dump),
199                        dump.u_ssize << PAGE_SHIFT))
200                 dump.u_ssize = 0;
201
202         set_fs(KERNEL_DS);
203         /* struct user */
204         DUMP_WRITE(&dump, sizeof(dump));
205         /* Now dump all of the user data.  Include malloced stuff as well */
206         DUMP_SEEK(PAGE_SIZE);
207         /* now we start writing out the user space info */
208         set_fs(USER_DS);
209         /* Dump the data area */
210         if (dump.u_dsize != 0) {
211                 dump_start = START_DATA(dump);
212                 dump_size = dump.u_dsize << PAGE_SHIFT;
213                 DUMP_WRITE(dump_start, dump_size);
214         }
215         /* Now prepare to dump the stack area */
216         if (dump.u_ssize != 0) {
217                 dump_start = START_STACK(dump);
218                 dump_size = dump.u_ssize << PAGE_SHIFT;
219                 DUMP_WRITE(dump_start, dump_size);
220         }
221         /*
222          * Finally dump the task struct.  Not be used by gdb, but
223          * could be useful
224          */
225         set_fs(KERNEL_DS);
226         DUMP_WRITE(current, sizeof(*current));
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 {
240         u32 __user *argv, *envp, *sp;
241         int argc = bprm->argc, envc = bprm->envc;
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;
248         put_user((unsigned long) envp, --sp);
249         put_user((unsigned long) argv, --sp);
250         put_user(argc, --sp);
251         current->mm->arg_start = (unsigned long) p;
252         while (argc-- > 0) {
253                 char c;
254
255                 put_user((u32)(unsigned long)p, argv++);
256                 do {
257                         get_user(c, p++);
258                 } while (c);
259         }
260         put_user(0, argv);
261         current->mm->arg_end = current->mm->env_start = (unsigned long) p;
262         while (envc-- > 0) {
263                 char c;
264
265                 put_user((u32)(unsigned long)p, envp++);
266                 do {
267                         get_user(c, p++);
268                 } while (c);
269         }
270         put_user(0, envp);
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  */
279 static int load_aout_binary(struct linux_binprm *bprm, struct pt_regs *regs)
280 {
281         unsigned long error, fd_offset, rlim;
282         struct exec ex;
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) ||
289             i_size_read(bprm->file->f_path.dentry->d_inode) <
290             ex.a_text+ex.a_data+N_SYMSIZE(ex)+N_TXTOFF(ex)) {
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
311         /* OK, This is the point of no return */
312         set_personality(PER_LINUX);
313         set_thread_flag(TIF_IA32);
314
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
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;
328         current->mm->cached_hole_size = 0;
329
330         current->mm->mmap = NULL;
331         install_exec_creds(bprm);
332         current->flags &= ~PF_FORKNOEXEC;
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(&current->mm->mmap_sem);
344                 error = do_brk(text_addr & PAGE_MASK, map_size);
345                 up_write(&current->mm->mmap_sem);
346
347                 if (error != (text_addr & PAGE_MASK)) {
348                         send_sig(SIGKILL, current, 0);
349                         return error;
350                 }
351
352                 error = bprm->file->f_op->read(bprm->file,
353                          (char __user *)text_addr,
354                           ex.a_text+ex.a_data, &pos);
355                 if ((signed long)error < 0) {
356                         send_sig(SIGKILL, current, 0);
357                         return error;
358                 }
359
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) &&
365                     (N_MAGIC(ex) != NMAGIC) &&
366                                 time_after(jiffies, error_time2 + 5*HZ)) {
367                         printk(KERN_NOTICE "executable not page aligned\n");
368                         error_time2 = jiffies;
369                 }
370
371                 if ((fd_offset & ~PAGE_MASK) != 0 &&
372                             time_after(jiffies, error_time + 5*HZ)) {
373                         printk(KERN_WARNING
374                                "fd_offset is not page aligned. Please convert "
375                                "program: %s\n",
376                                bprm->file->f_path.dentry->d_name.name);
377                         error_time = jiffies;
378                 }
379 #endif
380
381                 if (!bprm->file->f_op->mmap || (fd_offset & ~PAGE_MASK) != 0) {
382                         loff_t pos = fd_offset;
383
384                         down_write(&current->mm->mmap_sem);
385                         do_brk(N_TXTADDR(ex), ex.a_text+ex.a_data);
386                         up_write(&current->mm->mmap_sem);
387                         bprm->file->f_op->read(bprm->file,
388                                         (char __user *)N_TXTADDR(ex),
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(&current->mm->mmap_sem);
397                 error = do_mmap(bprm->file, N_TXTADDR(ex), ex.a_text,
398                                 PROT_READ | PROT_EXEC,
399                                 MAP_FIXED | MAP_PRIVATE | MAP_DENYWRITE |
400                                 MAP_EXECUTABLE | MAP_32BIT,
401                                 fd_offset);
402                 up_write(&current->mm->mmap_sem);
403
404                 if (error != N_TXTADDR(ex)) {
405                         send_sig(SIGKILL, current, 0);
406                         return error;
407                 }
408
409                 down_write(&current->mm->mmap_sem);
410                 error = do_mmap(bprm->file, N_DATADDR(ex), ex.a_data,
411                                 PROT_READ | PROT_WRITE | PROT_EXEC,
412                                 MAP_FIXED | MAP_PRIVATE | MAP_DENYWRITE |
413                                 MAP_EXECUTABLE | MAP_32BIT,
414                                 fd_offset + ex.a_text);
415                 up_write(&current->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
426         retval = setup_arg_pages(bprm, IA32_STACK_TOP, EXSTACK_DEFAULT);
427         if (retval < 0) {
428                 /* Someone check-me: is this error path enough? */
429                 send_sig(SIGKILL, current, 0);
430                 return retval;
431         }
432
433         current->mm->start_stack =
434                 (unsigned long)create_aout_tables((char __user *)bprm->p, bprm);
435         /* start thread */
436         loadsegment(fs, 0);
437         loadsegment(ds, __USER32_DS);
438         loadsegment(es, __USER32_DS);
439         load_gs_index(0);
440         (regs)->ip = ex.a_entry;
441         (regs)->sp = current->mm->start_stack;
442         (regs)->flags = 0x200;
443         (regs)->cs = __USER32_CS;
444         (regs)->ss = __USER32_DS;
445         regs->r8 = regs->r9 = regs->r10 = regs->r11 =
446         regs->r12 = regs->r13 = regs->r14 = regs->r15 = 0;
447         set_fs(USER_DS);
448         return 0;
449 }
450
451 static int load_aout_library(struct file *file)
452 {
453         struct inode *inode;
454         unsigned long bss, start_addr, len, error;
455         int retval;
456         struct exec ex;
457
458         inode = file->f_path.dentry->d_inode;
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) ||
468             i_size_read(inode) <
469             ex.a_text+ex.a_data+N_SYMSIZE(ex)+N_TXTOFF(ex)) {
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;
486                 if (time_after(jiffies, error_time + 5*HZ)) {
487                         printk(KERN_WARNING
488                                "N_TXTOFF is not page aligned. Please convert "
489                                "library: %s\n",
490                                file->f_path.dentry->d_name.name);
491                         error_time = jiffies;
492                 }
493 #endif
494                 down_write(&current->mm->mmap_sem);
495                 do_brk(start_addr, ex.a_text + ex.a_data + ex.a_bss);
496                 up_write(&current->mm->mmap_sem);
497
498                 file->f_op->read(file, (char __user *)start_addr,
499                         ex.a_text + ex.a_data, &pos);
500                 flush_icache_range((unsigned long) start_addr,
501                                    (unsigned long) start_addr + ex.a_text +
502                                    ex.a_data);
503
504                 retval = 0;
505                 goto out;
506         }
507         /* Now use mmap to map the library into memory. */
508         down_write(&current->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(&current->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(&current->mm->mmap_sem);
522                 error = do_brk(start_addr + len, bss - len);
523                 up_write(&current->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");