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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 | |
36 | #include <linux/elf.h> |
37 | |
38 | static int load_som_binary(struct linux_binprm * bprm, struct pt_regs * regs); |
39 | static 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 |
46 | static int som_core_dump(struct coredump_params *cprm); |
47 | #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 | |
55 | static 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 | */ |
68 | static 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 | |
106 | static 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 | |
134 | static 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(¤t->mm->mmap_sem); |
151 | retval = do_mmap(file, code_start, code_size, prot, |
152 | flags, SOM_PAGESTART(hpuxhdr->exec_tfile)); |
153 | up_write(¤t->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(¤t->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(¤t->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(¤t->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(¤t->mm->mmap_sem); |
175 | if (retval > 0 || retval < -1024) |
176 | retval = 0; |
177 | out: |
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 | |
188 | static int |
189 | load_som_binary(struct linux_binprm * bprm, struct pt_regs * regs) |
190 | { |
191 | 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; |
210 | hpuxhdr = kmalloc(size, GFP_KERNEL); |
211 | if (!hpuxhdr) |
212 | goto out; |
213 | |
214 | retval = kernel_read(bprm->file, som_ex->aux_header_location, |
215 | (char *) hpuxhdr, size); |
216 | if (retval != size) { |
217 | if (retval >= 0) |
218 | retval = -EIO; |
219 | goto out_free; |
220 | } |
221 | |
222 | /* 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 */ |
228 | current->flags &= ~PF_FORKNOEXEC; |
229 | current->personality = PER_HPUX; |
230 | setup_new_exec(bprm); |
231 | |
232 | /* Set the task size for HP-UX processes such that |
233 | * the gateway page is outside the address space. |
234 | * This can be fixed later, but for now, this is much |
235 | * easier. |
236 | */ |
237 | |
238 | current->thread.task_size = 0xc0000000; |
239 | |
240 | /* Set map base to allow enough room for hp-ux heap growth */ |
241 | |
242 | current->thread.map_base = 0x80000000; |
243 | |
244 | retval = map_som_binary(bprm->file, hpuxhdr); |
245 | if (retval < 0) |
246 | goto out_free; |
247 | |
248 | som_entry = hpuxhdr->exec_entry; |
249 | kfree(hpuxhdr); |
250 | |
251 | set_binfmt(&som_format); |
252 | install_exec_creds(bprm); |
253 | setup_arg_pages(bprm, STACK_TOP, EXSTACK_DEFAULT); |
254 | |
255 | create_som_tables(bprm); |
256 | |
257 | current->mm->start_stack = bprm->p; |
258 | |
259 | #if 0 |
260 | printk("(start_brk) %08lx\n" , (unsigned long) current->mm->start_brk); |
261 | printk("(end_code) %08lx\n" , (unsigned long) current->mm->end_code); |
262 | printk("(start_code) %08lx\n" , (unsigned long) current->mm->start_code); |
263 | printk("(end_data) %08lx\n" , (unsigned long) current->mm->end_data); |
264 | printk("(start_stack) %08lx\n" , (unsigned long) current->mm->start_stack); |
265 | printk("(brk) %08lx\n" , (unsigned long) current->mm->brk); |
266 | #endif |
267 | |
268 | map_hpux_gateway_page(current,current->mm); |
269 | |
270 | start_thread_som(regs, som_entry, bprm->p); |
271 | return 0; |
272 | |
273 | /* error cleanup */ |
274 | out_free: |
275 | kfree(hpuxhdr); |
276 | out: |
277 | return retval; |
278 | } |
279 | |
280 | static int load_som_library(struct file *f) |
281 | { |
282 | /* No lib support in SOM yet. gizza chance.. */ |
283 | return -ENOEXEC; |
284 | } |
285 | /* Install the SOM loader. |
286 | * N.B. We *rely* on the table being the right size with the |
287 | * right number of free slots... |
288 | */ |
289 | |
290 | static int __init init_som_binfmt(void) |
291 | { |
292 | return register_binfmt(&som_format); |
293 | } |
294 | |
295 | static void __exit exit_som_binfmt(void) |
296 | { |
297 | /* Remove the SOM loader. */ |
298 | unregister_binfmt(&som_format); |
299 | } |
300 | |
301 | core_initcall(init_som_binfmt); |
302 | module_exit(exit_som_binfmt); |
303 | |
304 | MODULE_LICENSE("GPL"); |
305 |
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