binfmt_som.c

Version: - FREEBSD - FREEBSD-13-STABLE - FREEBSD-13-0 - FREEBSD-12-STABLE - FREEBSD-12-0 - FREEBSD-11-STABLE - FREEBSD-11-0 - FREEBSD-10-STABLE - FREEBSD-10-0 - FREEBSD-9-STABLE - FREEBSD-9-0 - FREEBSD-8-STABLE - FREEBSD-8-0 - FREEBSD-7-STABLE - FREEBSD-7-0 - FREEBSD-6-STABLE - FREEBSD-6-0 - FREEBSD-5-STABLE - FREEBSD-5-0 - FREEBSD-4-STABLE - FREEBSD-3-STABLE - FREEBSD22 - l41 - OPENBSD - linux-2.6 - MK84 - PLAN9 - xnu-8792
SearchContext: - none - 3 - 10

    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");

Cache object: e2a9567510f35e38791567b20ad00691

[ source navigation ] [ diff markup ] [ identifier search ] [ freetext search ] [ file search ] [ list types ] [ track identifier ]

This page is part of the FreeBSD/Linux Linux Kernel Cross-Reference, and was automatically generated using a modified version of the LXR engine.

FreeBSD/Linux Kernel Cross Reference sys/fs/binfmt_som.c

FreeBSD/Linux Kernel Cross Reference
sys/fs/binfmt_som.c