2 * linux/fs/binfmt_som.c
4 * These are the functions used to load SOM format executables as used
7 * Copyright 1999 Matthew Wilcox <willy@bofh.ai>
8 * based on binfmt_elf which is
9 * Copyright 1993, 1994: Eric Youngdale (ericy@cais.com).
12 #include <linux/module.h>
15 #include <linux/stat.h>
16 #include <linux/sched.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 #include <linux/vs_base.h>
32 #include <linux/vs_memory.h>
35 #include <asm/uaccess.h>
36 #include <asm/pgtable.h>
38 #include <linux/config.h>
40 #include <linux/elf.h>
42 static int load_som_binary(struct linux_binprm * bprm, struct pt_regs * regs);
43 static int load_som_library(struct file *);
46 * If we don't support core dumping, then supply a NULL so we
50 static int som_core_dump(long signr, struct pt_regs * regs);
52 #define som_core_dump NULL
55 #define SOM_PAGESTART(_v) ((_v) & ~(unsigned long)(SOM_PAGESIZE-1))
56 #define SOM_PAGEOFFSET(_v) ((_v) & (SOM_PAGESIZE-1))
57 #define SOM_PAGEALIGN(_v) (((_v) + SOM_PAGESIZE - 1) & ~(SOM_PAGESIZE - 1))
59 static struct linux_binfmt som_format = {
60 .module = THIS_MODULE,
61 .load_binary = load_som_binary,
62 .load_shlib = load_som_library,
63 .core_dump = som_core_dump,
64 .min_coredump = SOM_PAGESIZE
68 * create_som_tables() parses the env- and arg-strings in new user
69 * memory and creates the pointer tables from them, and puts their
70 * addresses on the "stack", returning the new stack pointer value.
72 static void create_som_tables(struct linux_binprm *bprm)
75 int argc = bprm->argc;
76 int envc = bprm->envc;
80 /* Word-align the stack pointer */
81 sp = (unsigned long *)((bprm->p + 3) & ~3);
88 __put_user((unsigned long) envp,++sp);
89 __put_user((unsigned long) argv,++sp);
91 __put_user(argc, ++sp);
93 bprm->p = (unsigned long) sp;
95 p = current->mm->arg_start;
97 __put_user((char *)p,argv++);
98 p += strlen_user((char *)p);
100 __put_user(NULL, argv);
101 current->mm->arg_end = current->mm->env_start = p;
103 __put_user((char *)p,envp++);
104 p += strlen_user((char *)p);
106 __put_user(NULL, envp);
107 current->mm->env_end = p;
110 static int check_som_header(struct som_hdr *som_ex)
112 int *buf = (int *)som_ex;
115 if (som_ex->system_id != SOM_SID_PARISC_1_0 &&
116 som_ex->system_id != SOM_SID_PARISC_1_1 &&
117 som_ex->system_id != SOM_SID_PARISC_2_0)
120 if (som_ex->a_magic != SOM_EXEC_NONSHARE &&
121 som_ex->a_magic != SOM_EXEC_SHARE &&
122 som_ex->a_magic != SOM_EXEC_DEMAND)
125 if (som_ex->version_id != SOM_ID_OLD &&
126 som_ex->version_id != SOM_ID_NEW)
138 static int map_som_binary(struct file *file,
139 const struct som_exec_auxhdr *hpuxhdr)
141 unsigned long code_start, code_size, data_start, data_size;
142 unsigned long bss_start, som_brk;
144 int prot = PROT_READ | PROT_EXEC;
145 int flags = MAP_FIXED|MAP_PRIVATE|MAP_DENYWRITE|MAP_EXECUTABLE;
147 mm_segment_t old_fs = get_fs();
150 code_start = SOM_PAGESTART(hpuxhdr->exec_tmem);
151 code_size = SOM_PAGEALIGN(hpuxhdr->exec_tsize);
152 current->mm->start_code = code_start;
153 current->mm->end_code = code_start + code_size;
154 down_write(¤t->mm->mmap_sem);
155 retval = do_mmap(file, code_start, code_size, prot,
156 flags, SOM_PAGESTART(hpuxhdr->exec_tfile));
157 up_write(¤t->mm->mmap_sem);
158 if (retval < 0 && retval > -1024)
161 data_start = SOM_PAGESTART(hpuxhdr->exec_dmem);
162 data_size = SOM_PAGEALIGN(hpuxhdr->exec_dsize);
163 current->mm->start_data = data_start;
164 current->mm->end_data = bss_start = data_start + data_size;
165 down_write(¤t->mm->mmap_sem);
166 retval = do_mmap(file, data_start, data_size,
167 prot | PROT_WRITE, flags,
168 SOM_PAGESTART(hpuxhdr->exec_dfile));
169 up_write(¤t->mm->mmap_sem);
170 if (retval < 0 && retval > -1024)
173 som_brk = bss_start + SOM_PAGEALIGN(hpuxhdr->exec_bsize);
174 current->mm->start_brk = current->mm->brk = som_brk;
175 down_write(¤t->mm->mmap_sem);
176 retval = do_mmap(NULL, bss_start, som_brk - bss_start,
177 prot | PROT_WRITE, MAP_FIXED | MAP_PRIVATE, 0);
178 up_write(¤t->mm->mmap_sem);
179 if (retval > 0 || retval < -1024)
188 * These are the functions used to load SOM executables and shared
189 * libraries. There is no binary dependent code anywhere else.
193 load_som_binary(struct linux_binprm * bprm, struct pt_regs * regs)
198 unsigned long som_entry;
199 struct som_hdr *som_ex;
200 struct som_exec_auxhdr *hpuxhdr;
202 /* Get the exec-header */
203 som_ex = (struct som_hdr *) bprm->buf;
205 retval = check_som_header(som_ex);
209 /* Now read in the auxiliary header information */
212 size = som_ex->aux_header_size;
213 if (size > SOM_PAGESIZE)
215 hpuxhdr = (struct som_exec_auxhdr *) kmalloc(size, GFP_KERNEL);
219 retval = kernel_read(bprm->file, som_ex->aux_header_location,
220 (char *) hpuxhdr, size);
223 #error "Fix security hole before enabling me"
224 retval = get_unused_fd();
227 get_file(bprm->file);
228 fd_install(som_exec_fileno = retval, bprm->file);
230 /* Flush all traces of the currently running executable */
231 retval = flush_old_exec(bprm);
235 /* OK, This is the point of no return */
236 current->flags &= ~PF_FORKNOEXEC;
237 current->personality = PER_HPUX;
239 /* Set the task size for HP-UX processes such that
240 * the gateway page is outside the address space.
241 * This can be fixed later, but for now, this is much
245 current->thread.task_size = 0xc0000000;
247 /* Set map base to allow enough room for hp-ux heap growth */
249 current->thread.map_base = 0x80000000;
251 retval = map_som_binary(bprm->file, hpuxhdr);
255 som_entry = hpuxhdr->exec_entry;
258 set_binfmt(&som_format);
260 setup_arg_pages(bprm, STACK_TOP, EXSTACK_DEFAULT);
262 create_som_tables(bprm);
264 current->mm->start_stack = bprm->p;
267 printk("(start_brk) %08lx\n" , (unsigned long) current->mm->start_brk);
268 printk("(end_code) %08lx\n" , (unsigned long) current->mm->end_code);
269 printk("(start_code) %08lx\n" , (unsigned long) current->mm->start_code);
270 printk("(end_data) %08lx\n" , (unsigned long) current->mm->end_data);
271 printk("(start_stack) %08lx\n" , (unsigned long) current->mm->start_stack);
272 printk("(brk) %08lx\n" , (unsigned long) current->mm->brk);
275 map_hpux_gateway_page(current,current->mm);
277 start_thread_som(regs, som_entry, bprm->p);
278 if (current->ptrace & PT_PTRACED)
279 send_sig(SIGTRAP, current, 0);
289 static int load_som_library(struct file *f)
291 /* No lib support in SOM yet. gizza chance.. */
294 /* Install the SOM loader.
295 * N.B. We *rely* on the table being the right size with the
296 * right number of free slots...
299 static int __init init_som_binfmt(void)
301 return register_binfmt(&som_format);
304 static void __exit exit_som_binfmt(void)
306 /* Remove the SOM loader. */
307 unregister_binfmt(&som_format);
310 core_initcall(init_som_binfmt);
311 module_exit(exit_som_binfmt);