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_memory.h>
33 #include <asm/a.out.h>
34 #include <asm/uaccess.h>
35 #include <asm/pgtable.h>
38 #include <linux/elf.h>
40 static int load_som_binary(struct linux_binprm * bprm, struct pt_regs * regs);
41 static int load_som_library(struct file *);
44 * If we don't support core dumping, then supply a NULL so we
48 static int som_core_dump(long signr, struct pt_regs * regs);
50 #define som_core_dump NULL
53 #define SOM_PAGESTART(_v) ((_v) & ~(unsigned long)(SOM_PAGESIZE-1))
54 #define SOM_PAGEOFFSET(_v) ((_v) & (SOM_PAGESIZE-1))
55 #define SOM_PAGEALIGN(_v) (((_v) + SOM_PAGESIZE - 1) & ~(SOM_PAGESIZE - 1))
57 static struct linux_binfmt som_format = {
58 .module = THIS_MODULE,
59 .load_binary = load_som_binary,
60 .load_shlib = load_som_library,
61 .core_dump = som_core_dump,
62 .min_coredump = SOM_PAGESIZE
66 * create_som_tables() parses the env- and arg-strings in new user
67 * memory and creates the pointer tables from them, and puts their
68 * addresses on the "stack", returning the new stack pointer value.
70 static void create_som_tables(struct linux_binprm *bprm)
73 int argc = bprm->argc;
74 int envc = bprm->envc;
78 /* Word-align the stack pointer */
79 sp = (unsigned long *)((bprm->p + 3) & ~3);
86 __put_user((unsigned long) envp,++sp);
87 __put_user((unsigned long) argv,++sp);
89 __put_user(argc, ++sp);
91 bprm->p = (unsigned long) sp;
93 p = current->mm->arg_start;
95 __put_user((char *)p,argv++);
96 p += strlen_user((char *)p);
98 __put_user(NULL, argv);
99 current->mm->arg_end = current->mm->env_start = p;
101 __put_user((char *)p,envp++);
102 p += strlen_user((char *)p);
104 __put_user(NULL, envp);
105 current->mm->env_end = p;
108 static int check_som_header(struct som_hdr *som_ex)
110 int *buf = (int *)som_ex;
113 if (som_ex->system_id != SOM_SID_PARISC_1_0 &&
114 som_ex->system_id != SOM_SID_PARISC_1_1 &&
115 som_ex->system_id != SOM_SID_PARISC_2_0)
118 if (som_ex->a_magic != SOM_EXEC_NONSHARE &&
119 som_ex->a_magic != SOM_EXEC_SHARE &&
120 som_ex->a_magic != SOM_EXEC_DEMAND)
123 if (som_ex->version_id != SOM_ID_OLD &&
124 som_ex->version_id != SOM_ID_NEW)
136 static int map_som_binary(struct file *file,
137 const struct som_exec_auxhdr *hpuxhdr)
139 unsigned long code_start, code_size, data_start, data_size;
140 unsigned long bss_start, som_brk;
142 int prot = PROT_READ | PROT_EXEC;
143 int flags = MAP_FIXED|MAP_PRIVATE|MAP_DENYWRITE|MAP_EXECUTABLE;
145 mm_segment_t old_fs = get_fs();
148 code_start = SOM_PAGESTART(hpuxhdr->exec_tmem);
149 code_size = SOM_PAGEALIGN(hpuxhdr->exec_tsize);
150 current->mm->start_code = code_start;
151 current->mm->end_code = code_start + code_size;
152 down_write(¤t->mm->mmap_sem);
153 retval = do_mmap(file, code_start, code_size, prot,
154 flags, SOM_PAGESTART(hpuxhdr->exec_tfile));
155 up_write(¤t->mm->mmap_sem);
156 if (retval < 0 && retval > -1024)
159 data_start = SOM_PAGESTART(hpuxhdr->exec_dmem);
160 data_size = SOM_PAGEALIGN(hpuxhdr->exec_dsize);
161 current->mm->start_data = data_start;
162 current->mm->end_data = bss_start = data_start + data_size;
163 down_write(¤t->mm->mmap_sem);
164 retval = do_mmap(file, data_start, data_size,
165 prot | PROT_WRITE, flags,
166 SOM_PAGESTART(hpuxhdr->exec_dfile));
167 up_write(¤t->mm->mmap_sem);
168 if (retval < 0 && retval > -1024)
171 som_brk = bss_start + SOM_PAGEALIGN(hpuxhdr->exec_bsize);
172 current->mm->start_brk = current->mm->brk = som_brk;
173 down_write(¤t->mm->mmap_sem);
174 retval = do_mmap(NULL, bss_start, som_brk - bss_start,
175 prot | PROT_WRITE, MAP_FIXED | MAP_PRIVATE, 0);
176 up_write(¤t->mm->mmap_sem);
177 if (retval > 0 || retval < -1024)
186 * These are the functions used to load SOM executables and shared
187 * libraries. There is no binary dependent code anywhere else.
191 load_som_binary(struct linux_binprm * bprm, struct pt_regs * regs)
196 unsigned long som_entry;
197 struct som_hdr *som_ex;
198 struct som_exec_auxhdr *hpuxhdr;
199 struct files_struct *files;
201 /* Get the exec-header */
202 som_ex = (struct som_hdr *) bprm->buf;
204 retval = check_som_header(som_ex);
208 /* Now read in the auxiliary header information */
211 size = som_ex->aux_header_size;
212 if (size > SOM_PAGESIZE)
214 hpuxhdr = kmalloc(size, GFP_KERNEL);
218 retval = kernel_read(bprm->file, som_ex->aux_header_location,
219 (char *) hpuxhdr, size);
220 if (retval != size) {
226 files = current->files; /* Refcounted so ok */
227 retval = unshare_files();
230 if (files == current->files) {
231 put_files_struct(files);
235 retval = get_unused_fd();
238 get_file(bprm->file);
239 fd_install(som_exec_fileno = retval, bprm->file);
241 /* Flush all traces of the currently running executable */
242 retval = flush_old_exec(bprm);
246 /* OK, This is the point of no return */
247 current->flags &= ~PF_FORKNOEXEC;
248 current->personality = PER_HPUX;
250 /* Set the task size for HP-UX processes such that
251 * the gateway page is outside the address space.
252 * This can be fixed later, but for now, this is much
256 current->thread.task_size = 0xc0000000;
258 /* Set map base to allow enough room for hp-ux heap growth */
260 current->thread.map_base = 0x80000000;
262 retval = map_som_binary(bprm->file, hpuxhdr);
266 som_entry = hpuxhdr->exec_entry;
269 set_binfmt(&som_format);
271 setup_arg_pages(bprm, STACK_TOP, EXSTACK_DEFAULT);
273 create_som_tables(bprm);
275 current->mm->start_stack = bprm->p;
278 printk("(start_brk) %08lx\n" , (unsigned long) current->mm->start_brk);
279 printk("(end_code) %08lx\n" , (unsigned long) current->mm->end_code);
280 printk("(start_code) %08lx\n" , (unsigned long) current->mm->start_code);
281 printk("(end_data) %08lx\n" , (unsigned long) current->mm->end_data);
282 printk("(start_stack) %08lx\n" , (unsigned long) current->mm->start_stack);
283 printk("(brk) %08lx\n" , (unsigned long) current->mm->brk);
286 map_hpux_gateway_page(current,current->mm);
288 start_thread_som(regs, som_entry, bprm->p);
298 static int load_som_library(struct file *f)
300 /* No lib support in SOM yet. gizza chance.. */
303 /* Install the SOM loader.
304 * N.B. We *rely* on the table being the right size with the
305 * right number of free slots...
308 static int __init init_som_binfmt(void)
310 return register_binfmt(&som_format);
313 static void __exit exit_som_binfmt(void)
315 /* Remove the SOM loader. */
316 unregister_binfmt(&som_format);
319 core_initcall(init_som_binfmt);
320 module_exit(exit_som_binfmt);