1 /*
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
35 #include <linux/config.h>
36
37 #include <linux/elf.h>
38
39 static int load_som_binary(struct linux_binprm * bprm, struct pt_regs * regs);
40 static int load_som_library(struct file *);
41
42 /*
43 * If we don't support core dumping, then supply a NULL so we
44 * don't even try.
45 */
46 #if 0
47 static int som_core_dump(long signr, struct pt_regs * regs);
48 #else
49 #define som_core_dump NULL
50 #endif
51
52 #define SOM_PAGESTART(_v) ((_v) & ~(unsigned long)(SOM_PAGESIZE-1))
53 #define SOM_PAGEOFFSET(_v) ((_v) & (SOM_PAGESIZE-1))
54 #define SOM_PAGEALIGN(_v) (((_v) + SOM_PAGESIZE - 1) & ~(SOM_PAGESIZE - 1))
55
56 static struct linux_binfmt som_format = {
57 .module = THIS_MODULE,
58 .load_binary = load_som_binary,
59 .load_shlib = load_som_library,
60 .core_dump = som_core_dump,
61 .min_coredump = SOM_PAGESIZE
62 };
63
64 /*
65 * create_som_tables() parses the env- and arg-strings in new user
66 * memory and creates the pointer tables from them, and puts their
67 * addresses on the "stack", returning the new stack pointer value.
68 */
69 static void create_som_tables(struct linux_binprm *bprm)
70 {
71 char **argv, **envp;
72 int argc = bprm->argc;
73 int envc = bprm->envc;
74 unsigned long p;
75 unsigned long *sp;
76
77 /* Word-align the stack pointer */
78 sp = (unsigned long *)((bprm->p + 3) & ~3);
79
80 envp = (char **) sp;
81 sp += envc + 1;
82 argv = (char **) sp;
83 sp += argc + 1;
84
85 __put_user((unsigned long) envp,++sp);
86 __put_user((unsigned long) argv,++sp);
87
88 __put_user(argc, ++sp);
89
90 bprm->p = (unsigned long) sp;
91
92 p = current->mm->arg_start;
93 while (argc-- > 0) {
94 __put_user((char *)p,argv++);
95 p += strlen_user((char *)p);
96 }
97 __put_user(NULL, argv);
98 current->mm->arg_end = current->mm->env_start = p;
99 while (envc-- > 0) {
100 __put_user((char *)p,envp++);
101 p += strlen_user((char *)p);
102 }
103 __put_user(NULL, envp);
104 current->mm->env_end = p;
105 }
106
107 static int check_som_header(struct som_hdr *som_ex)
108 {
109 int *buf = (int *)som_ex;
110 int i, ck;
111
112 if (som_ex->system_id != SOM_SID_PARISC_1_0 &&
113 som_ex->system_id != SOM_SID_PARISC_1_1 &&
114 som_ex->system_id != SOM_SID_PARISC_2_0)
115 return -ENOEXEC;
116
117 if (som_ex->a_magic != SOM_EXEC_NONSHARE &&
118 som_ex->a_magic != SOM_EXEC_SHARE &&
119 som_ex->a_magic != SOM_EXEC_DEMAND)
120 return -ENOEXEC;
121
122 if (som_ex->version_id != SOM_ID_OLD &&
123 som_ex->version_id != SOM_ID_NEW)
124 return -ENOEXEC;
125
126 ck = 0;
127 for (i=0; i<32; i++)
128 ck ^= buf[i];
129 if (ck != 0)
130 return -ENOEXEC;
131
132 return 0;
133 }
134
135 static int map_som_binary(struct file *file,
136 const struct som_exec_auxhdr *hpuxhdr)
137 {
138 unsigned long code_start, code_size, data_start, data_size;
139 unsigned long bss_start, som_brk;
140 int retval;
141 int prot = PROT_READ | PROT_EXEC;
142 int flags = MAP_FIXED|MAP_PRIVATE|MAP_DENYWRITE|MAP_EXECUTABLE;
143
144 mm_segment_t old_fs = get_fs();
145 set_fs(get_ds());
146
147 code_start = SOM_PAGESTART(hpuxhdr->exec_tmem);
148 code_size = SOM_PAGEALIGN(hpuxhdr->exec_tsize);
149 current->mm->start_code = code_start;
150 current->mm->end_code = code_start + code_size;
151 down_write(¤t->mm->mmap_sem);
152 retval = do_mmap(file, code_start, code_size, prot,
153 flags, SOM_PAGESTART(hpuxhdr->exec_tfile));
154 up_write(¤t->mm->mmap_sem);
155 if (retval < 0 && retval > -1024)
156 goto out;
157
158 data_start = SOM_PAGESTART(hpuxhdr->exec_dmem);
159 data_size = SOM_PAGEALIGN(hpuxhdr->exec_dsize);
160 current->mm->start_data = data_start;
161 current->mm->end_data = bss_start = data_start + data_size;
162 down_write(¤t->mm->mmap_sem);
163 retval = do_mmap(file, data_start, data_size,
164 prot | PROT_WRITE, flags,
165 SOM_PAGESTART(hpuxhdr->exec_dfile));
166 up_write(¤t->mm->mmap_sem);
167 if (retval < 0 && retval > -1024)
168 goto out;
169
170 som_brk = bss_start + SOM_PAGEALIGN(hpuxhdr->exec_bsize);
171 current->mm->start_brk = current->mm->brk = som_brk;
172 down_write(¤t->mm->mmap_sem);
173 retval = do_mmap(NULL, bss_start, som_brk - bss_start,
174 prot | PROT_WRITE, MAP_FIXED | MAP_PRIVATE, 0);
175 up_write(¤t->mm->mmap_sem);
176 if (retval > 0 || retval < -1024)
177 retval = 0;
178 out:
179 set_fs(old_fs);
180 return retval;
181 }
182
183
184 /*
185 * These are the functions used to load SOM executables and shared
186 * libraries. There is no binary dependent code anywhere else.
187 */
188
189 static int
190 load_som_binary(struct linux_binprm * bprm, struct pt_regs * regs)
191 {
192 int som_exec_fileno;
193 int retval;
194 unsigned int size;
195 unsigned long som_entry;
196 struct som_hdr *som_ex;
197 struct som_exec_auxhdr *hpuxhdr;
198
199 /* Get the exec-header */
200 som_ex = (struct som_hdr *) bprm->buf;
201
202 retval = check_som_header(som_ex);
203 if (retval != 0)
204 goto out;
205
206 /* Now read in the auxiliary header information */
207
208 retval = -ENOMEM;
209 size = som_ex->aux_header_size;
210 if (size > SOM_PAGESIZE)
211 goto out;
212 hpuxhdr = (struct som_exec_auxhdr *) kmalloc(size, GFP_KERNEL);
213 if (!hpuxhdr)
214 goto out;
215
216 retval = kernel_read(bprm->file, som_ex->aux_header_location,
217 (char *) hpuxhdr, size);
218 if (retval < 0)
219 goto out_free;
220 #error "Fix security hole before enabling me"
221 retval = get_unused_fd();
222 if (retval < 0)
223 goto out_free;
224 get_file(bprm->file);
225 fd_install(som_exec_fileno = retval, bprm->file);
226
227 /* Flush all traces of the currently running executable */
228 retval = flush_old_exec(bprm);
229 if (retval)
230 goto out_free;
231
232 /* OK, This is the point of no return */
233 current->flags &= ~PF_FORKNOEXEC;
234 current->personality = PER_HPUX;
235
236 /* Set the task size for HP-UX processes such that
237 * the gateway page is outside the address space.
238 * This can be fixed later, but for now, this is much
239 * easier.
240 */
241
242 current->thread.task_size = 0xc0000000;
243
244 /* Set map base to allow enough room for hp-ux heap growth */
245
246 current->thread.map_base = 0x80000000;
247
248 retval = map_som_binary(bprm->file, hpuxhdr);
249 if (retval < 0)
250 goto out_free;
251
252 som_entry = hpuxhdr->exec_entry;
253 kfree(hpuxhdr);
254
255 set_binfmt(&som_format);
256 compute_creds(bprm);
257 setup_arg_pages(bprm, STACK_TOP, EXSTACK_DEFAULT);
258
259 create_som_tables(bprm);
260
261 current->mm->start_stack = bprm->p;
262 current->mm->rss = 0;
263
264 #if 0
265 printk("(start_brk) %08lx\n" , (unsigned long) current->mm->start_brk);
266 printk("(end_code) %08lx\n" , (unsigned long) current->mm->end_code);
267 printk("(start_code) %08lx\n" , (unsigned long) current->mm->start_code);
268 printk("(end_data) %08lx\n" , (unsigned long) current->mm->end_data);
269 printk("(start_stack) %08lx\n" , (unsigned long) current->mm->start_stack);
270 printk("(brk) %08lx\n" , (unsigned long) current->mm->brk);
271 #endif
272
273 map_hpux_gateway_page(current,current->mm);
274
275 start_thread_som(regs, som_entry, bprm->p);
276 if (current->ptrace & PT_PTRACED)
277 send_sig(SIGTRAP, current, 0);
278 return 0;
279
280 /* error cleanup */
281 out_free:
282 kfree(hpuxhdr);
283 out:
284 return retval;
285 }
286
287 static int load_som_library(struct file *f)
288 {
289 /* No lib support in SOM yet. gizza chance.. */
290 return -ENOEXEC;
291 }
292 /* Install the SOM loader.
293 * N.B. We *rely* on the table being the right size with the
294 * right number of free slots...
295 */
296
297 static int __init init_som_binfmt(void)
298 {
299 return register_binfmt(&som_format);
300 }
301
302 static void __exit exit_som_binfmt(void)
303 {
304 /* Remove the SOM loader. */
305 unregister_binfmt(&som_format);
306 }
307
308 core_initcall(init_som_binfmt);
309 module_exit(exit_som_binfmt);
310
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