blob: e4fc746629a70000dc2ace0aac62038717add3f1 [file] [log] [blame]
Linus Torvalds1da177e2005-04-16 15:20:36 -07001/*
2 * linux/fs/binfmt_som.c
3 *
4 * These are the functions used to load SOM format executables as used
5 * by HP-UX.
6 *
7 * Copyright 1999 Matthew Wilcox <willy@bofh.ai>
8 * based on binfmt_elf which is
9 * Copyright 1993, 1994: Eric Youngdale (ericy@cais.com).
10 */
11
12#include <linux/module.h>
13
14#include <linux/fs.h>
15#include <linux/stat.h>
16#include <linux/sched.h>
17#include <linux/mm.h>
18#include <linux/mman.h>
19#include <linux/errno.h>
20#include <linux/signal.h>
21#include <linux/binfmts.h>
22#include <linux/som.h>
23#include <linux/string.h>
24#include <linux/file.h>
25#include <linux/fcntl.h>
26#include <linux/ptrace.h>
27#include <linux/slab.h>
28#include <linux/shm.h>
29#include <linux/personality.h>
30#include <linux/init.h>
31
32#include <asm/uaccess.h>
33#include <asm/pgtable.h>
34
Linus Torvalds1da177e2005-04-16 15:20:36 -070035
36#include <linux/elf.h>
37
38static int load_som_binary(struct linux_binprm * bprm, struct pt_regs * regs);
39static int load_som_library(struct file *);
40
41/*
42 * If we don't support core dumping, then supply a NULL so we
43 * don't even try.
44 */
45#if 0
Masami Hiramatsuf6151df2009-12-17 15:27:16 -080046static int som_core_dump(struct coredump_params *cprm);
Linus Torvalds1da177e2005-04-16 15:20:36 -070047#else
48#define som_core_dump NULL
49#endif
50
51#define SOM_PAGESTART(_v) ((_v) & ~(unsigned long)(SOM_PAGESIZE-1))
52#define SOM_PAGEOFFSET(_v) ((_v) & (SOM_PAGESIZE-1))
53#define SOM_PAGEALIGN(_v) (((_v) + SOM_PAGESIZE - 1) & ~(SOM_PAGESIZE - 1))
54
55static struct linux_binfmt som_format = {
56 .module = THIS_MODULE,
57 .load_binary = load_som_binary,
58 .load_shlib = load_som_library,
59 .core_dump = som_core_dump,
60 .min_coredump = SOM_PAGESIZE
61};
62
63/*
64 * create_som_tables() parses the env- and arg-strings in new user
65 * memory and creates the pointer tables from them, and puts their
66 * addresses on the "stack", returning the new stack pointer value.
67 */
68static void create_som_tables(struct linux_binprm *bprm)
69{
70 char **argv, **envp;
71 int argc = bprm->argc;
72 int envc = bprm->envc;
73 unsigned long p;
74 unsigned long *sp;
75
76 /* Word-align the stack pointer */
77 sp = (unsigned long *)((bprm->p + 3) & ~3);
78
79 envp = (char **) sp;
80 sp += envc + 1;
81 argv = (char **) sp;
82 sp += argc + 1;
83
84 __put_user((unsigned long) envp,++sp);
85 __put_user((unsigned long) argv,++sp);
86
87 __put_user(argc, ++sp);
88
89 bprm->p = (unsigned long) sp;
90
91 p = current->mm->arg_start;
92 while (argc-- > 0) {
93 __put_user((char *)p,argv++);
94 p += strlen_user((char *)p);
95 }
96 __put_user(NULL, argv);
97 current->mm->arg_end = current->mm->env_start = p;
98 while (envc-- > 0) {
99 __put_user((char *)p,envp++);
100 p += strlen_user((char *)p);
101 }
102 __put_user(NULL, envp);
103 current->mm->env_end = p;
104}
105
106static int check_som_header(struct som_hdr *som_ex)
107{
108 int *buf = (int *)som_ex;
109 int i, ck;
110
111 if (som_ex->system_id != SOM_SID_PARISC_1_0 &&
112 som_ex->system_id != SOM_SID_PARISC_1_1 &&
113 som_ex->system_id != SOM_SID_PARISC_2_0)
114 return -ENOEXEC;
115
116 if (som_ex->a_magic != SOM_EXEC_NONSHARE &&
117 som_ex->a_magic != SOM_EXEC_SHARE &&
118 som_ex->a_magic != SOM_EXEC_DEMAND)
119 return -ENOEXEC;
120
121 if (som_ex->version_id != SOM_ID_OLD &&
122 som_ex->version_id != SOM_ID_NEW)
123 return -ENOEXEC;
124
125 ck = 0;
126 for (i=0; i<32; i++)
127 ck ^= buf[i];
128 if (ck != 0)
129 return -ENOEXEC;
130
131 return 0;
132}
133
134static int map_som_binary(struct file *file,
135 const struct som_exec_auxhdr *hpuxhdr)
136{
137 unsigned long code_start, code_size, data_start, data_size;
138 unsigned long bss_start, som_brk;
139 int retval;
140 int prot = PROT_READ | PROT_EXEC;
141 int flags = MAP_FIXED|MAP_PRIVATE|MAP_DENYWRITE|MAP_EXECUTABLE;
142
143 mm_segment_t old_fs = get_fs();
144 set_fs(get_ds());
145
146 code_start = SOM_PAGESTART(hpuxhdr->exec_tmem);
147 code_size = SOM_PAGEALIGN(hpuxhdr->exec_tsize);
148 current->mm->start_code = code_start;
149 current->mm->end_code = code_start + code_size;
150 down_write(&current->mm->mmap_sem);
151 retval = do_mmap(file, code_start, code_size, prot,
152 flags, SOM_PAGESTART(hpuxhdr->exec_tfile));
153 up_write(&current->mm->mmap_sem);
154 if (retval < 0 && retval > -1024)
155 goto out;
156
157 data_start = SOM_PAGESTART(hpuxhdr->exec_dmem);
158 data_size = SOM_PAGEALIGN(hpuxhdr->exec_dsize);
159 current->mm->start_data = data_start;
160 current->mm->end_data = bss_start = data_start + data_size;
161 down_write(&current->mm->mmap_sem);
162 retval = do_mmap(file, data_start, data_size,
163 prot | PROT_WRITE, flags,
164 SOM_PAGESTART(hpuxhdr->exec_dfile));
165 up_write(&current->mm->mmap_sem);
166 if (retval < 0 && retval > -1024)
167 goto out;
168
169 som_brk = bss_start + SOM_PAGEALIGN(hpuxhdr->exec_bsize);
170 current->mm->start_brk = current->mm->brk = som_brk;
171 down_write(&current->mm->mmap_sem);
172 retval = do_mmap(NULL, bss_start, som_brk - bss_start,
173 prot | PROT_WRITE, MAP_FIXED | MAP_PRIVATE, 0);
174 up_write(&current->mm->mmap_sem);
175 if (retval > 0 || retval < -1024)
176 retval = 0;
177out:
178 set_fs(old_fs);
179 return retval;
180}
181
182
183/*
184 * These are the functions used to load SOM executables and shared
185 * libraries. There is no binary dependent code anywhere else.
186 */
187
188static int
189load_som_binary(struct linux_binprm * bprm, struct pt_regs * regs)
190{
Linus Torvalds1da177e2005-04-16 15:20:36 -0700191 int retval;
192 unsigned int size;
193 unsigned long som_entry;
194 struct som_hdr *som_ex;
195 struct som_exec_auxhdr *hpuxhdr;
196
197 /* Get the exec-header */
198 som_ex = (struct som_hdr *) bprm->buf;
199
200 retval = check_som_header(som_ex);
201 if (retval != 0)
202 goto out;
203
204 /* Now read in the auxiliary header information */
205
206 retval = -ENOMEM;
207 size = som_ex->aux_header_size;
208 if (size > SOM_PAGESIZE)
209 goto out;
Matthew Wilcoxdc027472006-09-24 13:35:50 -0600210 hpuxhdr = kmalloc(size, GFP_KERNEL);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700211 if (!hpuxhdr)
212 goto out;
213
214 retval = kernel_read(bprm->file, som_ex->aux_header_location,
215 (char *) hpuxhdr, size);
Matthew Wilcoxdc027472006-09-24 13:35:50 -0600216 if (retval != size) {
217 if (retval >= 0)
218 retval = -EIO;
219 goto out_free;
220 }
221
Linus Torvalds1da177e2005-04-16 15:20:36 -0700222 /* Flush all traces of the currently running executable */
223 retval = flush_old_exec(bprm);
224 if (retval)
225 goto out_free;
226
227 /* OK, This is the point of no return */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700228 current->personality = PER_HPUX;
Linus Torvalds221af7f2010-01-28 22:14:42 -0800229 setup_new_exec(bprm);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700230
231 /* Set the task size for HP-UX processes such that
232 * the gateway page is outside the address space.
233 * This can be fixed later, but for now, this is much
234 * easier.
235 */
236
237 current->thread.task_size = 0xc0000000;
238
239 /* Set map base to allow enough room for hp-ux heap growth */
240
241 current->thread.map_base = 0x80000000;
242
243 retval = map_som_binary(bprm->file, hpuxhdr);
244 if (retval < 0)
245 goto out_free;
246
247 som_entry = hpuxhdr->exec_entry;
248 kfree(hpuxhdr);
249
250 set_binfmt(&som_format);
David Howellsa6f76f22008-11-14 10:39:24 +1100251 install_exec_creds(bprm);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700252 setup_arg_pages(bprm, STACK_TOP, EXSTACK_DEFAULT);
253
254 create_som_tables(bprm);
255
256 current->mm->start_stack = bprm->p;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700257
258#if 0
259 printk("(start_brk) %08lx\n" , (unsigned long) current->mm->start_brk);
260 printk("(end_code) %08lx\n" , (unsigned long) current->mm->end_code);
261 printk("(start_code) %08lx\n" , (unsigned long) current->mm->start_code);
262 printk("(end_data) %08lx\n" , (unsigned long) current->mm->end_data);
263 printk("(start_stack) %08lx\n" , (unsigned long) current->mm->start_stack);
264 printk("(brk) %08lx\n" , (unsigned long) current->mm->brk);
265#endif
266
267 map_hpux_gateway_page(current,current->mm);
268
269 start_thread_som(regs, som_entry, bprm->p);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700270 return 0;
271
272 /* error cleanup */
273out_free:
274 kfree(hpuxhdr);
275out:
276 return retval;
277}
278
279static int load_som_library(struct file *f)
280{
281/* No lib support in SOM yet. gizza chance.. */
282 return -ENOEXEC;
283}
284 /* Install the SOM loader.
285 * N.B. We *rely* on the table being the right size with the
286 * right number of free slots...
287 */
288
289static int __init init_som_binfmt(void)
290{
Al Viro8fc3dc52012-03-17 03:05:16 -0400291 register_binfmt(&som_format);
292 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700293}
294
295static void __exit exit_som_binfmt(void)
296{
297 /* Remove the SOM loader. */
298 unregister_binfmt(&som_format);
299}
300
301core_initcall(init_som_binfmt);
302module_exit(exit_som_binfmt);
Adrian Bunkcde162c2008-10-15 22:02:37 -0700303
304MODULE_LICENSE("GPL");