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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); |
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 | retval = vm_mmap(file, code_start, code_size, prot, |
151 | flags, SOM_PAGESTART(hpuxhdr->exec_tfile)); |
152 | if (retval < 0 && retval > -1024) |
153 | goto out; |
154 | |
155 | data_start = SOM_PAGESTART(hpuxhdr->exec_dmem); |
156 | data_size = SOM_PAGEALIGN(hpuxhdr->exec_dsize); |
157 | current->mm->start_data = data_start; |
158 | current->mm->end_data = bss_start = data_start + data_size; |
159 | retval = vm_mmap(file, data_start, data_size, |
160 | prot | PROT_WRITE, flags, |
161 | SOM_PAGESTART(hpuxhdr->exec_dfile)); |
162 | if (retval < 0 && retval > -1024) |
163 | goto out; |
164 | |
165 | som_brk = bss_start + SOM_PAGEALIGN(hpuxhdr->exec_bsize); |
166 | current->mm->start_brk = current->mm->brk = som_brk; |
167 | retval = vm_mmap(NULL, bss_start, som_brk - bss_start, |
168 | prot | PROT_WRITE, MAP_FIXED | MAP_PRIVATE, 0); |
169 | if (retval > 0 || retval < -1024) |
170 | retval = 0; |
171 | out: |
172 | set_fs(old_fs); |
173 | return retval; |
174 | } |
175 | |
176 | |
177 | /* |
178 | * These are the functions used to load SOM executables and shared |
179 | * libraries. There is no binary dependent code anywhere else. |
180 | */ |
181 | |
182 | static int |
183 | load_som_binary(struct linux_binprm * bprm) |
184 | { |
185 | int retval; |
186 | unsigned int size; |
187 | unsigned long som_entry; |
188 | struct som_hdr *som_ex; |
189 | struct som_exec_auxhdr *hpuxhdr; |
190 | struct pt_regs *regs = current_pt_regs(); |
191 | |
192 | /* Get the exec-header */ |
193 | som_ex = (struct som_hdr *) bprm->buf; |
194 | |
195 | retval = check_som_header(som_ex); |
196 | if (retval != 0) |
197 | goto out; |
198 | |
199 | /* Now read in the auxiliary header information */ |
200 | |
201 | retval = -ENOMEM; |
202 | size = som_ex->aux_header_size; |
203 | if (size > SOM_PAGESIZE) |
204 | goto out; |
205 | hpuxhdr = kmalloc(size, GFP_KERNEL); |
206 | if (!hpuxhdr) |
207 | goto out; |
208 | |
209 | retval = kernel_read(bprm->file, som_ex->aux_header_location, |
210 | (char *) hpuxhdr, size); |
211 | if (retval != size) { |
212 | if (retval >= 0) |
213 | retval = -EIO; |
214 | goto out_free; |
215 | } |
216 | |
217 | /* Flush all traces of the currently running executable */ |
218 | retval = flush_old_exec(bprm); |
219 | if (retval) |
220 | goto out_free; |
221 | |
222 | /* OK, This is the point of no return */ |
223 | current->personality = PER_HPUX; |
224 | setup_new_exec(bprm); |
225 | |
226 | /* Set the task size for HP-UX processes such that |
227 | * the gateway page is outside the address space. |
228 | * This can be fixed later, but for now, this is much |
229 | * easier. |
230 | */ |
231 | |
232 | current->thread.task_size = 0xc0000000; |
233 | |
234 | /* Set map base to allow enough room for hp-ux heap growth */ |
235 | |
236 | current->thread.map_base = 0x80000000; |
237 | |
238 | retval = map_som_binary(bprm->file, hpuxhdr); |
239 | if (retval < 0) |
240 | goto out_free; |
241 | |
242 | som_entry = hpuxhdr->exec_entry; |
243 | kfree(hpuxhdr); |
244 | |
245 | set_binfmt(&som_format); |
246 | install_exec_creds(bprm); |
247 | setup_arg_pages(bprm, STACK_TOP, EXSTACK_DEFAULT); |
248 | |
249 | create_som_tables(bprm); |
250 | |
251 | current->mm->start_stack = bprm->p; |
252 | |
253 | #if 0 |
254 | printk("(start_brk) %08lx\n" , (unsigned long) current->mm->start_brk); |
255 | printk("(end_code) %08lx\n" , (unsigned long) current->mm->end_code); |
256 | printk("(start_code) %08lx\n" , (unsigned long) current->mm->start_code); |
257 | printk("(end_data) %08lx\n" , (unsigned long) current->mm->end_data); |
258 | printk("(start_stack) %08lx\n" , (unsigned long) current->mm->start_stack); |
259 | printk("(brk) %08lx\n" , (unsigned long) current->mm->brk); |
260 | #endif |
261 | |
262 | map_hpux_gateway_page(current,current->mm); |
263 | |
264 | start_thread_som(regs, som_entry, bprm->p); |
265 | return 0; |
266 | |
267 | /* error cleanup */ |
268 | out_free: |
269 | kfree(hpuxhdr); |
270 | out: |
271 | return retval; |
272 | } |
273 | |
274 | static int load_som_library(struct file *f) |
275 | { |
276 | /* No lib support in SOM yet. gizza chance.. */ |
277 | return -ENOEXEC; |
278 | } |
279 | /* Install the SOM loader. |
280 | * N.B. We *rely* on the table being the right size with the |
281 | * right number of free slots... |
282 | */ |
283 | |
284 | static int __init init_som_binfmt(void) |
285 | { |
286 | register_binfmt(&som_format); |
287 | return 0; |
288 | } |
289 | |
290 | static void __exit exit_som_binfmt(void) |
291 | { |
292 | /* Remove the SOM loader. */ |
293 | unregister_binfmt(&som_format); |
294 | } |
295 | |
296 | core_initcall(init_som_binfmt); |
297 | module_exit(exit_som_binfmt); |
298 | |
299 | MODULE_LICENSE("GPL"); |
300 |
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