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/*

 * linux/fs/binfmt_som.c

 *

 * These are the functions used to load SOM format executables as used

 * by HP-UX.

 *

 * Copyright 1999 Matthew Wilcox <willy@bofh.ai>

 * based on binfmt_elf which is

 * Copyright 1993, 1994: Eric Youngdale (ericy@cais.com).

 */

#include <linux/module.h>

#include <linux/fs.h>

#include <linux/stat.h>

#include <linux/sched.h>

#include <linux/mm.h>

#include <linux/mman.h>

#include <linux/errno.h>

#include <linux/signal.h>

#include <linux/binfmts.h>

#include <linux/som.h>

#include <linux/string.h>

#include <linux/file.h>

#include <linux/fcntl.h>

#include <linux/ptrace.h>

#include <linux/slab.h>

#include <linux/shm.h>

#include <linux/personality.h>

#include <linux/init.h>

#include <asm/a.out.h>

#include <asm/uaccess.h>

#include <asm/pgtable.h>

#include <linux/elf.h>

static int load_som_binary(struct linux_binprm * bprm, struct pt_regs * regs);

static int load_som_library(struct file *);

/*

 * If we don't support core dumping, then supply a NULL so we

 * don't even try.

 */

#if 0

static int som_core_dump(long signr, struct pt_regs *regs, unsigned long limit);

#else

#define som_core_dump   NULL

#endif

#define SOM_PAGESTART(_v) ((_v) & ~(unsigned long)(SOM_PAGESIZE-1))

#define SOM_PAGEOFFSET(_v) ((_v) & (SOM_PAGESIZE-1))

#define SOM_PAGEALIGN(_v) (((_v) + SOM_PAGESIZE - 1) & ~(SOM_PAGESIZE - 1))

static struct linux_binfmt som_format = {

        .module         = THIS_MODULE,

        .load_binary    = load_som_binary,

        .load_shlib     = load_som_library,

        .core_dump      = som_core_dump,

        .min_coredump   = SOM_PAGESIZE

};

/*

 * create_som_tables() parses the env- and arg-strings in new user

 * memory and creates the pointer tables from them, and puts their

 * addresses on the "stack", returning the new stack pointer value.

 */

static void create_som_tables(struct linux_binprm *bprm)

{

        char **argv, **envp;

        int argc = bprm->argc;

        int envc = bprm->envc;

        unsigned long p;

        unsigned long *sp;

        /* Word-align the stack pointer */

        sp = (unsigned long *)((bprm->p + 3) & ~3);

        envp = (char **) sp;

        sp += envc + 1;

        argv = (char **) sp;

        sp += argc + 1;

        __put_user((unsigned long) envp,++sp);

        __put_user((unsigned long) argv,++sp);

        __put_user(argc, ++sp);

        bprm->p = (unsigned long) sp;

        p = current->mm->arg_start;

        while (argc-- > 0) {

                __put_user((char *)p,argv++);

                p += strlen_user((char *)p);

        }

        __put_user(NULL, argv);

        current->mm->arg_end = current->mm->env_start = p;

        while (envc-- > 0) {

                __put_user((char *)p,envp++);

                p += strlen_user((char *)p);

        }

        __put_user(NULL, envp);

        current->mm->env_end = p;

}

static int check_som_header(struct som_hdr *som_ex)

{

        int *buf = (int *)som_ex;

        int i, ck;

        if (som_ex->system_id != SOM_SID_PARISC_1_0 &&

            som_ex->system_id != SOM_SID_PARISC_1_1 &&

            som_ex->system_id != SOM_SID_PARISC_2_0)

                return -ENOEXEC;

        if (som_ex->a_magic != SOM_EXEC_NONSHARE &&

            som_ex->a_magic != SOM_EXEC_SHARE &&

            som_ex->a_magic != SOM_EXEC_DEMAND)

                return -ENOEXEC;

        if (som_ex->version_id != SOM_ID_OLD &&

            som_ex->version_id != SOM_ID_NEW)

                return -ENOEXEC;

        ck = 0;

        for (i=0; i<32; i++)

                ck ^= buf[i];

        if (ck != 0)

                return -ENOEXEC;

        return 0;

}

static int map_som_binary(struct file *file,

                const struct som_exec_auxhdr *hpuxhdr)

{

        unsigned long code_start, code_size, data_start, data_size;

        unsigned long bss_start, som_brk;

        int retval;

        int prot = PROT_READ | PROT_EXEC;

        int flags = MAP_FIXED|MAP_PRIVATE|MAP_DENYWRITE|MAP_EXECUTABLE;

        mm_segment_t old_fs = get_fs();

        set_fs(get_ds());

        code_start = SOM_PAGESTART(hpuxhdr->exec_tmem);

        code_size = SOM_PAGEALIGN(hpuxhdr->exec_tsize);

        current->mm->start_code = code_start;

        current->mm->end_code = code_start + code_size;

        down_write(&current->mm->mmap_sem);

        retval = do_mmap(file, code_start, code_size, prot,

                        flags, SOM_PAGESTART(hpuxhdr->exec_tfile));

        up_write(&current->mm->mmap_sem);

        if (retval < 0 && retval > -1024)

                goto out;

        data_start = SOM_PAGESTART(hpuxhdr->exec_dmem);

        data_size = SOM_PAGEALIGN(hpuxhdr->exec_dsize);

        current->mm->start_data = data_start;

        current->mm->end_data = bss_start = data_start + data_size;

        down_write(&current->mm->mmap_sem);

        retval = do_mmap(file, data_start, data_size,

                        prot | PROT_WRITE, flags,

                        SOM_PAGESTART(hpuxhdr->exec_dfile));

        up_write(&current->mm->mmap_sem);

        if (retval < 0 && retval > -1024)

                goto out;

        som_brk = bss_start + SOM_PAGEALIGN(hpuxhdr->exec_bsize);

        current->mm->start_brk = current->mm->brk = som_brk;

        down_write(&current->mm->mmap_sem);

        retval = do_mmap(NULL, bss_start, som_brk - bss_start,

                        prot | PROT_WRITE, MAP_FIXED | MAP_PRIVATE, 0);

        up_write(&current->mm->mmap_sem);

        if (retval > 0 || retval < -1024)

                retval = 0;

out:

        set_fs(old_fs);

        return retval;

}

/*

 * These are the functions used to load SOM executables and shared

 * libraries.  There is no binary dependent code anywhere else.

 */

static int

load_som_binary(struct linux_binprm * bprm, struct pt_regs * regs)

{

        int som_exec_fileno;

        int retval;

        unsigned int size;

        unsigned long som_entry;

        struct som_hdr *som_ex;

        struct som_exec_auxhdr *hpuxhdr;

        struct files_struct *files;

        /* Get the exec-header */

        som_ex = (struct som_hdr *) bprm->buf;

        retval = check_som_header(som_ex);

        if (retval != 0)

                goto out;

        /* Now read in the auxiliary header information */

        retval = -ENOMEM;

        size = som_ex->aux_header_size;

        if (size > SOM_PAGESIZE)

                goto out;

        hpuxhdr = kmalloc(size, GFP_KERNEL);

        if (!hpuxhdr)

                goto out;

        retval = kernel_read(bprm->file, som_ex->aux_header_location,

                        (char *) hpuxhdr, size);

        if (retval != size) {

                if (retval >= 0)

                        retval = -EIO;

                goto out_free;

        }

        files = current->files; /* Refcounted so ok */

        retval = unshare_files();

        if (retval < 0)

                goto out_free;

        if (files == current->files) {

                put_files_struct(files);

                files = NULL;

        }

        retval = get_unused_fd();

        if (retval < 0)

                goto out_free;

        get_file(bprm->file);

        fd_install(som_exec_fileno = retval, bprm->file);

        /* Flush all traces of the currently running executable */

        retval = flush_old_exec(bprm);

        if (retval)

                goto out_free;

        /* OK, This is the point of no return */

        current->flags &= ~PF_FORKNOEXEC;

        current->personality = PER_HPUX;

        /* Set the task size for HP-UX processes such that

         * the gateway page is outside the address space.

         * This can be fixed later, but for now, this is much

         * easier.

         */

        current->thread.task_size = 0xc0000000;

        /* Set map base to allow enough room for hp-ux heap growth */

        current->thread.map_base = 0x80000000;

        retval = map_som_binary(bprm->file, hpuxhdr);

        if (retval < 0)

                goto out_free;

        som_entry = hpuxhdr->exec_entry;

        kfree(hpuxhdr);

        set_binfmt(&som_format);

        compute_creds(bprm);

        setup_arg_pages(bprm, STACK_TOP, EXSTACK_DEFAULT);

        create_som_tables(bprm);

        current->mm->start_stack = bprm->p;

#if 0

        printk("(start_brk) %08lx\n" , (unsigned long) current->mm->start_brk);

        printk("(end_code) %08lx\n" , (unsigned long) current->mm->end_code);

        printk("(start_code) %08lx\n" , (unsigned long) current->mm->start_code);

        printk("(end_data) %08lx\n" , (unsigned long) current->mm->end_data);

        printk("(start_stack) %08lx\n" , (unsigned long) current->mm->start_stack);

        printk("(brk) %08lx\n" , (unsigned long) current->mm->brk);

#endif

        map_hpux_gateway_page(current,current->mm);

        start_thread_som(regs, som_entry, bprm->p);

        if (current->ptrace & PT_PTRACED)

                send_sig(SIGTRAP, current, 0);

        return 0;

        /* error cleanup */

out_free:

        kfree(hpuxhdr);

out:

        return retval;

}

static int load_som_library(struct file *f)

{

/* No lib support in SOM yet.  gizza chance.. */

        return -ENOEXEC;

}

        /* Install the SOM loader.

         * N.B. We *rely* on the table being the right size with the

         * right number of free slots...

         */

static int __init init_som_binfmt(void)

{

        return register_binfmt(&som_format);

}

static void __exit exit_som_binfmt(void)

{

        /* Remove the SOM loader. */

        unregister_binfmt(&som_format);

}

core_initcall(init_som_binfmt);

module_exit(exit_som_binfmt);