arch/sparc64/kernel/binfmt_aout32.c - maze/linux - Git at Google

 /*
  *  linux/fs/binfmt_aout.c
  *
  *  Copyright (C) 1991, 1992, 1996  Linus Torvalds
  *
  *  Hacked a bit by DaveM to make it work with 32-bit SunOS
  *  binaries on the sparc64 port.
  */

 #include <linux/module.h>

 #include <linux/sched.h>
 #include <linux/kernel.h>
 #include <linux/mm.h>
 #include <linux/mman.h>
 #include <linux/a.out.h>
 #include <linux/errno.h>
 #include <linux/signal.h>
 #include <linux/string.h>
 #include <linux/fs.h>
 #include <linux/file.h>
 #include <linux/stat.h>
 #include <linux/fcntl.h>
 #include <linux/ptrace.h>
 #include <linux/user.h>
 #include <linux/slab.h>
 #include <linux/binfmts.h>
 #include <linux/personality.h>
 #include <linux/init.h>

 #include <asm/system.h>
 #include <asm/uaccess.h>
 #include <asm/pgalloc.h>

 static int load_aout32_binary(struct linux_binprm *, struct pt_regs * regs);
 static int load_aout32_library(struct file*);
 static int aout32_core_dump(long signr, struct pt_regs * regs, struct file *file);

 extern void dump_thread(struct pt_regs *, struct user *);

 static struct linux_binfmt aout32_format = {
 	NULL, THIS_MODULE, load_aout32_binary, load_aout32_library, aout32_core_dump,
 	PAGE_SIZE
 };

 static void set_brk(unsigned long start, unsigned long end)
 {
 	start = PAGE_ALIGN(start);
 	end = PAGE_ALIGN(end);
 	if (end <= start)
 		return;
 	down_write(&current->mm->mmap_sem);
 	do_brk(start, end - start);
 	up_write(&current->mm->mmap_sem);
 }

 /*
  * These are the only things you should do on a core-file: use only these
  * macros to write out all the necessary info.
  */

 static int dump_write(struct file *file, const void *addr, int nr)
 {
 	return file->f_op->write(file, addr, nr, &file->f_pos) == nr;
 }

 #define DUMP_WRITE(addr, nr)	\
 	if (!dump_write(file, (void *)(addr), (nr))) \
 		goto end_coredump;

 #define DUMP_SEEK(offset) \
 if (file->f_op->llseek) { \
 	if (file->f_op->llseek(file,(offset),0) != (offset)) \
  		goto end_coredump; \
 } else file->f_pos = (offset)

 /*
  * Routine writes a core dump image in the current directory.
  * Currently only a stub-function.
  *
  * Note that setuid/setgid files won't make a core-dump if the uid/gid
  * changed due to the set[u|g]id. It's enforced by the "current->mm->dumpable"
  * field, which also makes sure the core-dumps won't be recursive if the
  * dumping of the process results in another error..
  */

 static int aout32_core_dump(long signr, struct pt_regs *regs, struct file *file)
 {
 	mm_segment_t fs;
 	int has_dumped = 0;
 	unsigned long dump_start, dump_size;
 	struct user dump;
 #       define START_DATA(u)    (u.u_tsize)
 #       define START_STACK(u)   ((regs->u_regs[UREG_FP]) & ~(PAGE_SIZE - 1))

 	fs = get_fs();
 	set_fs(KERNEL_DS);
 	has_dumped = 1;
 	current->flags |= PF_DUMPCORE;
        	strncpy(dump.u_comm, current->comm, sizeof(dump.u_comm));
 	dump.signal = signr;
 	dump_thread(regs, &dump);

 /* If the size of the dump file exceeds the rlimit, then see what would happen
    if we wrote the stack, but not the data area.  */
 	if ((dump.u_dsize+dump.u_ssize) >
 	    current->signal->rlim[RLIMIT_CORE].rlim_cur)
 		dump.u_dsize = 0;

 /* Make sure we have enough room to write the stack and data areas. */
 	if ((dump.u_ssize) >
 	    current->signal->rlim[RLIMIT_CORE].rlim_cur)
 		dump.u_ssize = 0;

 /* make sure we actually have a data and stack area to dump */
 	set_fs(USER_DS);
 	if (!access_ok(VERIFY_READ, (void __user *) START_DATA(dump), dump.u_dsize))
 		dump.u_dsize = 0;
 	if (!access_ok(VERIFY_READ, (void __user *) START_STACK(dump), dump.u_ssize))
 		dump.u_ssize = 0;

 	set_fs(KERNEL_DS);
 /* struct user */
 	DUMP_WRITE(&dump,sizeof(dump));
 /* now we start writing out the user space info */
 	set_fs(USER_DS);
 /* Dump the data area */
 	if (dump.u_dsize != 0) {
 		dump_start = START_DATA(dump);
 		dump_size = dump.u_dsize;
 		DUMP_WRITE(dump_start,dump_size);
 	}
 /* Now prepare to dump the stack area */
 	if (dump.u_ssize != 0) {
 		dump_start = START_STACK(dump);
 		dump_size = dump.u_ssize;
 		DUMP_WRITE(dump_start,dump_size);
 	}
 /* Finally dump the task struct.  Not be used by gdb, but could be useful */
 	set_fs(KERNEL_DS);
 	DUMP_WRITE(current,sizeof(*current));
 end_coredump:
 	set_fs(fs);
 	return has_dumped;
 }

 /*
  * create_aout32_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 u32 __user *create_aout32_tables(char __user *p, struct linux_binprm *bprm)
 {
 	u32 __user *argv;
 	u32 __user *envp;
 	u32 __user *sp;
 	int argc = bprm->argc;
 	int envc = bprm->envc;

 	sp = (u32 __user *)((-(unsigned long)sizeof(char *))&(unsigned long)p);

 	/* This imposes the proper stack alignment for a new process. */
 	sp = (u32 __user *) (((unsigned long) sp) & ~7);
 	if ((envc+argc+3)&1)
 		--sp;

 	sp -= envc+1;
 	envp = sp;
 	sp -= argc+1;
 	argv = sp;
 	put_user(argc,--sp);
 	current->mm->arg_start = (unsigned long) p;
 	while (argc-->0) {
 		char c;
 		put_user(((u32)(unsigned long)(p)),argv++);
 		do {
 			get_user(c,p++);
 		} while (c);
 	}
 	put_user(NULL,argv);
 	current->mm->arg_end = current->mm->env_start = (unsigned long) p;
 	while (envc-->0) {
 		char c;
 		put_user(((u32)(unsigned long)(p)),envp++);
 		do {
 			get_user(c,p++);
 		} while (c);
 	}
 	put_user(NULL,envp);
 	current->mm->env_end = (unsigned long) p;
 	return sp;
 }

 /*
  * These are the functions used to load a.out style executables and shared
  * libraries.  There is no binary dependent code anywhere else.
  */

 static int load_aout32_binary(struct linux_binprm * bprm, struct pt_regs * regs)
 {
 	struct exec ex;
 	unsigned long error;
 	unsigned long fd_offset;
 	unsigned long rlim;
 	unsigned long orig_thr_flags;
 	int retval;

 	ex = *((struct exec *) bprm->buf);		/* exec-header */
 	if ((N_MAGIC(ex) != ZMAGIC && N_MAGIC(ex) != OMAGIC &&
 	     N_MAGIC(ex) != QMAGIC && N_MAGIC(ex) != NMAGIC) ||
 	    N_TRSIZE(ex) || N_DRSIZE(ex) ||
 	    bprm->file->f_dentry->d_inode->i_size < ex.a_text+ex.a_data+N_SYMSIZE(ex)+N_TXTOFF(ex)) {
 		return -ENOEXEC;
 	}

 	fd_offset = N_TXTOFF(ex);

 	/* Check initial limits. This avoids letting people circumvent
 	 * size limits imposed on them by creating programs with large
 	 * arrays in the data or bss.
 	 */
 	rlim = current->signal->rlim[RLIMIT_DATA].rlim_cur;
 	if (rlim >= RLIM_INFINITY)
 		rlim = ~0;
 	if (ex.a_data + ex.a_bss > rlim)
 		return -ENOMEM;

 	/* Flush all traces of the currently running executable */
 	retval = flush_old_exec(bprm);
 	if (retval)
 		return retval;

 	/* OK, This is the point of no return */
 	set_personality(PER_SUNOS);

 	current->mm->end_code = ex.a_text +
 		(current->mm->start_code = N_TXTADDR(ex));
 	current->mm->end_data = ex.a_data +
 		(current->mm->start_data = N_DATADDR(ex));
 	current->mm->brk = ex.a_bss +
 		(current->mm->start_brk = N_BSSADDR(ex));

 	set_mm_counter(current->mm, rss, 0);
 	current->mm->mmap = NULL;
 	compute_creds(bprm);
  	current->flags &= ~PF_FORKNOEXEC;
 	if (N_MAGIC(ex) == NMAGIC) {
 		loff_t pos = fd_offset;
 		/* Fuck me plenty... */
 		down_write(&current->mm->mmap_sem);
 		error = do_brk(N_TXTADDR(ex), ex.a_text);
 		up_write(&current->mm->mmap_sem);
 		bprm->file->f_op->read(bprm->file, (char __user *)N_TXTADDR(ex),
 			  ex.a_text, &pos);
 		down_write(&current->mm->mmap_sem);
 		error = do_brk(N_DATADDR(ex), ex.a_data);
 		up_write(&current->mm->mmap_sem);
 		bprm->file->f_op->read(bprm->file, (char __user *)N_DATADDR(ex),
 			  ex.a_data, &pos);
 		goto beyond_if;
 	}

 	if (N_MAGIC(ex) == OMAGIC) {
 		loff_t pos = fd_offset;
 		down_write(&current->mm->mmap_sem);
 		do_brk(N_TXTADDR(ex) & PAGE_MASK,
 			ex.a_text+ex.a_data + PAGE_SIZE - 1);
 		up_write(&current->mm->mmap_sem);
 		bprm->file->f_op->read(bprm->file, (char __user *)N_TXTADDR(ex),
 			  ex.a_text+ex.a_data, &pos);
 	} else {
 		static unsigned long error_time;
 		if ((ex.a_text & 0xfff || ex.a_data & 0xfff) &&
 		    (N_MAGIC(ex) != NMAGIC) && (jiffies-error_time) > 5*HZ)
 		{
 			printk(KERN_NOTICE "executable not page aligned\n");
 			error_time = jiffies;
 		}

 		if (!bprm->file->f_op->mmap) {
 			loff_t pos = fd_offset;
 			down_write(&current->mm->mmap_sem);
 			do_brk(0, ex.a_text+ex.a_data);
 			up_write(&current->mm->mmap_sem);
 			bprm->file->f_op->read(bprm->file,
 				  (char __user *)N_TXTADDR(ex),
 				  ex.a_text+ex.a_data, &pos);
 			goto beyond_if;
 		}

 	        down_write(&current->mm->mmap_sem);
 		error = do_mmap(bprm->file, N_TXTADDR(ex), ex.a_text,
 			PROT_READ | PROT_EXEC,
 			MAP_FIXED | MAP_PRIVATE | MAP_DENYWRITE | MAP_EXECUTABLE,
 			fd_offset);
 	        up_write(&current->mm->mmap_sem);

 		if (error != N_TXTADDR(ex)) {
 			send_sig(SIGKILL, current, 0);
 			return error;
 		}

 	        down_write(&current->mm->mmap_sem);
  		error = do_mmap(bprm->file, N_DATADDR(ex), ex.a_data,
 				PROT_READ | PROT_WRITE | PROT_EXEC,
 				MAP_FIXED | MAP_PRIVATE | MAP_DENYWRITE | MAP_EXECUTABLE,
 				fd_offset + ex.a_text);
 	        up_write(&current->mm->mmap_sem);
 		if (error != N_DATADDR(ex)) {
 			send_sig(SIGKILL, current, 0);
 			return error;
 		}
 	}
 beyond_if:
 	set_binfmt(&aout32_format);

 	set_brk(current->mm->start_brk, current->mm->brk);

 	/* Make sure STACK_TOP returns the right thing.  */
 	orig_thr_flags = current_thread_info()->flags;
 	current_thread_info()->flags |= _TIF_32BIT;

 	retval = setup_arg_pages(bprm, STACK_TOP, EXSTACK_DEFAULT);
 	if (retval < 0) {
 		current_thread_info()->flags = orig_thr_flags;

 		/* Someone check-me: is this error path enough? */
 		send_sig(SIGKILL, current, 0);
 		return retval;
 	}

 	current->mm->start_stack =
 		(unsigned long) create_aout32_tables((char __user *)bprm->p, bprm);
 	if (!(orig_thr_flags & _TIF_32BIT)) {
 		unsigned long pgd_cache = get_pgd_cache(current->mm->pgd);

 		__asm__ __volatile__("stxa\t%0, [%1] %2\n\t"
 				     "membar #Sync"
 				     : /* no outputs */
 				     : "r" (pgd_cache),
 				       "r" (TSB_REG), "i" (ASI_DMMU));
 	}
 	start_thread32(regs, ex.a_entry, current->mm->start_stack);
 	if (current->ptrace & PT_PTRACED)
 		send_sig(SIGTRAP, current, 0);
 	return 0;
 }

 /* N.B. Move to .h file and use code in fs/binfmt_aout.c? */
 static int load_aout32_library(struct file *file)
 {
 	struct inode * inode;
 	unsigned long bss, start_addr, len;
 	unsigned long error;
 	int retval;
 	struct exec ex;

 	inode = file->f_dentry->d_inode;

 	retval = -ENOEXEC;
 	error = kernel_read(file, 0, (char *) &ex, sizeof(ex));
 	if (error != sizeof(ex))
 		goto out;

 	/* We come in here for the regular a.out style of shared libraries */
 	if ((N_MAGIC(ex) != ZMAGIC && N_MAGIC(ex) != QMAGIC) || N_TRSIZE(ex) ||
 	    N_DRSIZE(ex) || ((ex.a_entry & 0xfff) && N_MAGIC(ex) == ZMAGIC) ||
 	    inode->i_size < ex.a_text+ex.a_data+N_SYMSIZE(ex)+N_TXTOFF(ex)) {
 		goto out;
 	}

 	if (N_MAGIC(ex) == ZMAGIC && N_TXTOFF(ex) &&
 	    (N_TXTOFF(ex) < inode->i_sb->s_blocksize)) {
 		printk("N_TXTOFF < BLOCK_SIZE. Please convert library\n");
 		goto out;
 	}

 	if (N_FLAGS(ex))
 		goto out;

 	/* For  QMAGIC, the starting address is 0x20 into the page.  We mask
 	   this off to get the starting address for the page */

 	start_addr =  ex.a_entry & 0xfffff000;

 	/* Now use mmap to map the library into memory. */
 	down_write(&current->mm->mmap_sem);
 	error = do_mmap(file, start_addr, ex.a_text + ex.a_data,
 			PROT_READ | PROT_WRITE | PROT_EXEC,
 			MAP_FIXED | MAP_PRIVATE | MAP_DENYWRITE,
 			N_TXTOFF(ex));
 	up_write(&current->mm->mmap_sem);
 	retval = error;
 	if (error != start_addr)
 		goto out;

 	len = PAGE_ALIGN(ex.a_text + ex.a_data);
 	bss = ex.a_text + ex.a_data + ex.a_bss;
 	if (bss > len) {
 		down_write(&current->mm->mmap_sem);
 		error = do_brk(start_addr + len, bss - len);
 		up_write(&current->mm->mmap_sem);
 		retval = error;
 		if (error != start_addr + len)
 			goto out;
 	}
 	retval = 0;
 out:
 	return retval;
 }

 static int __init init_aout32_binfmt(void)
 {
 	return register_binfmt(&aout32_format);
 }

 static void __exit exit_aout32_binfmt(void)
 {
 	unregister_binfmt(&aout32_format);
 }

 module_init(init_aout32_binfmt);
 module_exit(exit_aout32_binfmt);
	/*
	* linux/fs/binfmt_aout.c
	*
	* Copyright (C) 1991, 1992, 1996 Linus Torvalds
	*
	* Hacked a bit by DaveM to make it work with 32-bit SunOS
	* binaries on the sparc64 port.
	*/

	#include <linux/module.h>

	#include <linux/sched.h>
	#include <linux/kernel.h>
	#include <linux/mm.h>
	#include <linux/mman.h>
	#include <linux/a.out.h>
	#include <linux/errno.h>
	#include <linux/signal.h>
	#include <linux/string.h>
	#include <linux/fs.h>
	#include <linux/file.h>
	#include <linux/stat.h>
	#include <linux/fcntl.h>
	#include <linux/ptrace.h>
	#include <linux/user.h>
	#include <linux/slab.h>
	#include <linux/binfmts.h>
	#include <linux/personality.h>
	#include <linux/init.h>

	#include <asm/system.h>
	#include <asm/uaccess.h>
	#include <asm/pgalloc.h>

	static int load_aout32_binary(struct linux_binprm , struct pt_regs regs);
	static int load_aout32_library(struct file*);
	static int aout32_core_dump(long signr, struct pt_regs * regs, struct file *file);

	extern void dump_thread(struct pt_regs , struct user );

	static struct linux_binfmt aout32_format = {
	NULL, THIS_MODULE, load_aout32_binary, load_aout32_library, aout32_core_dump,
	PAGE_SIZE
	};

	static void set_brk(unsigned long start, unsigned long end)
	{
	start = PAGE_ALIGN(start);
	end = PAGE_ALIGN(end);
	if (end <= start)
	return;
	down_write(&current->mm->mmap_sem);
	do_brk(start, end - start);
	up_write(&current->mm->mmap_sem);
	}

	/*
	* These are the only things you should do on a core-file: use only these
	* macros to write out all the necessary info.
	*/

	static int dump_write(struct file file, const void addr, int nr)
	{
	return file->f_op->write(file, addr, nr, &file->f_pos) == nr;
	}

	#define DUMP_WRITE(addr, nr) \
	if (!dump_write(file, (void *)(addr), (nr))) \
	goto end_coredump;

	#define DUMP_SEEK(offset) \
	if (file->f_op->llseek) { \
	if (file->f_op->llseek(file,(offset),0) != (offset)) \
	goto end_coredump; \
	} else file->f_pos = (offset)

	/*
	* Routine writes a core dump image in the current directory.
	* Currently only a stub-function.
	*
	* Note that setuid/setgid files won't make a core-dump if the uid/gid
	* changed due to the set[u\|g]id. It's enforced by the "current->mm->dumpable"
	* field, which also makes sure the core-dumps won't be recursive if the
	* dumping of the process results in another error..
	*/

	static int aout32_core_dump(long signr, struct pt_regs regs, struct file file)
	{
	mm_segment_t fs;
	int has_dumped = 0;
	unsigned long dump_start, dump_size;
	struct user dump;
	# define START_DATA(u) (u.u_tsize)
	# define START_STACK(u) ((regs->u_regs[UREG_FP]) & ~(PAGE_SIZE - 1))

	fs = get_fs();
	set_fs(KERNEL_DS);
	has_dumped = 1;
	current->flags \|= PF_DUMPCORE;
	strncpy(dump.u_comm, current->comm, sizeof(dump.u_comm));
	dump.signal = signr;
	dump_thread(regs, &dump);

	/* If the size of the dump file exceeds the rlimit, then see what would happen
	if we wrote the stack, but not the data area. */
	if ((dump.u_dsize+dump.u_ssize) >
	current->signal->rlim[RLIMIT_CORE].rlim_cur)
	dump.u_dsize = 0;

	/* Make sure we have enough room to write the stack and data areas. */
	if ((dump.u_ssize) >
	current->signal->rlim[RLIMIT_CORE].rlim_cur)
	dump.u_ssize = 0;

	/* make sure we actually have a data and stack area to dump */
	set_fs(USER_DS);
	if (!access_ok(VERIFY_READ, (void __user *) START_DATA(dump), dump.u_dsize))
	dump.u_dsize = 0;
	if (!access_ok(VERIFY_READ, (void __user *) START_STACK(dump), dump.u_ssize))
	dump.u_ssize = 0;

	set_fs(KERNEL_DS);
	/* struct user */
	DUMP_WRITE(&dump,sizeof(dump));
	/* now we start writing out the user space info */
	set_fs(USER_DS);
	/* Dump the data area */
	if (dump.u_dsize != 0) {
	dump_start = START_DATA(dump);
	dump_size = dump.u_dsize;
	DUMP_WRITE(dump_start,dump_size);
	}
	/* Now prepare to dump the stack area */
	if (dump.u_ssize != 0) {
	dump_start = START_STACK(dump);
	dump_size = dump.u_ssize;
	DUMP_WRITE(dump_start,dump_size);
	}
	/* Finally dump the task struct. Not be used by gdb, but could be useful */
	set_fs(KERNEL_DS);
	DUMP_WRITE(current,sizeof(*current));
	end_coredump:
	set_fs(fs);
	return has_dumped;
	}

	/*
	* create_aout32_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 u32 __user create_aout32_tables(char __user p, struct linux_binprm *bprm)
	{
	u32 __user *argv;
	u32 __user *envp;
	u32 __user *sp;
	int argc = bprm->argc;
	int envc = bprm->envc;

	sp = (u32 __user )((-(unsigned long)sizeof(char ))&(unsigned long)p);

	/* This imposes the proper stack alignment for a new process. */
	sp = (u32 __user *) (((unsigned long) sp) & ~7);
	if ((envc+argc+3)&1)
	--sp;

	sp -= envc+1;
	envp = sp;
	sp -= argc+1;
	argv = sp;
	put_user(argc,--sp);
	current->mm->arg_start = (unsigned long) p;
	while (argc-->0) {
	char c;
	put_user(((u32)(unsigned long)(p)),argv++);
	do {
	get_user(c,p++);
	} while (c);
	}
	put_user(NULL,argv);
	current->mm->arg_end = current->mm->env_start = (unsigned long) p;
	while (envc-->0) {
	char c;
	put_user(((u32)(unsigned long)(p)),envp++);
	do {
	get_user(c,p++);
	} while (c);
	}
	put_user(NULL,envp);
	current->mm->env_end = (unsigned long) p;
	return sp;
	}

	/*
	* These are the functions used to load a.out style executables and shared
	* libraries. There is no binary dependent code anywhere else.
	*/

	static int load_aout32_binary(struct linux_binprm * bprm, struct pt_regs * regs)
	{
	struct exec ex;
	unsigned long error;
	unsigned long fd_offset;
	unsigned long rlim;
	unsigned long orig_thr_flags;
	int retval;

	ex = ((struct exec ) bprm->buf); /* exec-header */
	if ((N_MAGIC(ex) != ZMAGIC && N_MAGIC(ex) != OMAGIC &&
	N_MAGIC(ex) != QMAGIC && N_MAGIC(ex) != NMAGIC) \|\|
	N_TRSIZE(ex) \|\| N_DRSIZE(ex) \|\|
	bprm->file->f_dentry->d_inode->i_size < ex.a_text+ex.a_data+N_SYMSIZE(ex)+N_TXTOFF(ex)) {
	return -ENOEXEC;
	}

	fd_offset = N_TXTOFF(ex);

	/* Check initial limits. This avoids letting people circumvent
	* size limits imposed on them by creating programs with large
	* arrays in the data or bss.
	*/
	rlim = current->signal->rlim[RLIMIT_DATA].rlim_cur;
	if (rlim >= RLIM_INFINITY)
	rlim = ~0;
	if (ex.a_data + ex.a_bss > rlim)
	return -ENOMEM;

	/* Flush all traces of the currently running executable */
	retval = flush_old_exec(bprm);
	if (retval)
	return retval;

	/* OK, This is the point of no return */
	set_personality(PER_SUNOS);

	current->mm->end_code = ex.a_text +
	(current->mm->start_code = N_TXTADDR(ex));
	current->mm->end_data = ex.a_data +
	(current->mm->start_data = N_DATADDR(ex));
	current->mm->brk = ex.a_bss +
	(current->mm->start_brk = N_BSSADDR(ex));

	set_mm_counter(current->mm, rss, 0);
	current->mm->mmap = NULL;
	compute_creds(bprm);
	current->flags &= ~PF_FORKNOEXEC;
	if (N_MAGIC(ex) == NMAGIC) {
	loff_t pos = fd_offset;
	/* Fuck me plenty... */
	down_write(&current->mm->mmap_sem);
	error = do_brk(N_TXTADDR(ex), ex.a_text);
	up_write(&current->mm->mmap_sem);
	bprm->file->f_op->read(bprm->file, (char __user *)N_TXTADDR(ex),
	ex.a_text, &pos);
	down_write(&current->mm->mmap_sem);
	error = do_brk(N_DATADDR(ex), ex.a_data);
	up_write(&current->mm->mmap_sem);
	bprm->file->f_op->read(bprm->file, (char __user *)N_DATADDR(ex),
	ex.a_data, &pos);
	goto beyond_if;
	}

	if (N_MAGIC(ex) == OMAGIC) {
	loff_t pos = fd_offset;
	down_write(&current->mm->mmap_sem);
	do_brk(N_TXTADDR(ex) & PAGE_MASK,
	ex.a_text+ex.a_data + PAGE_SIZE - 1);
	up_write(&current->mm->mmap_sem);
	bprm->file->f_op->read(bprm->file, (char __user *)N_TXTADDR(ex),
	ex.a_text+ex.a_data, &pos);
	} else {
	static unsigned long error_time;
	if ((ex.a_text & 0xfff \|\| ex.a_data & 0xfff) &&
	(N_MAGIC(ex) != NMAGIC) && (jiffies-error_time) > 5*HZ)
	{
	printk(KERN_NOTICE "executable not page aligned\n");
	error_time = jiffies;
	}

	if (!bprm->file->f_op->mmap) {
	loff_t pos = fd_offset;
	down_write(&current->mm->mmap_sem);
	do_brk(0, ex.a_text+ex.a_data);
	up_write(&current->mm->mmap_sem);
	bprm->file->f_op->read(bprm->file,
	(char __user *)N_TXTADDR(ex),
	ex.a_text+ex.a_data, &pos);
	goto beyond_if;
	}

	down_write(&current->mm->mmap_sem);
	error = do_mmap(bprm->file, N_TXTADDR(ex), ex.a_text,
	PROT_READ \| PROT_EXEC,
	MAP_FIXED \| MAP_PRIVATE \| MAP_DENYWRITE \| MAP_EXECUTABLE,
	fd_offset);
	up_write(&current->mm->mmap_sem);

	if (error != N_TXTADDR(ex)) {
	send_sig(SIGKILL, current, 0);
	return error;
	}

	down_write(&current->mm->mmap_sem);
	error = do_mmap(bprm->file, N_DATADDR(ex), ex.a_data,
	PROT_READ \| PROT_WRITE \| PROT_EXEC,
	MAP_FIXED \| MAP_PRIVATE \| MAP_DENYWRITE \| MAP_EXECUTABLE,
	fd_offset + ex.a_text);
	up_write(&current->mm->mmap_sem);
	if (error != N_DATADDR(ex)) {
	send_sig(SIGKILL, current, 0);
	return error;
	}
	}
	beyond_if:
	set_binfmt(&aout32_format);

	set_brk(current->mm->start_brk, current->mm->brk);

	/* Make sure STACK_TOP returns the right thing. */
	orig_thr_flags = current_thread_info()->flags;
	current_thread_info()->flags \|= _TIF_32BIT;

	retval = setup_arg_pages(bprm, STACK_TOP, EXSTACK_DEFAULT);
	if (retval < 0) {
	current_thread_info()->flags = orig_thr_flags;

	/* Someone check-me: is this error path enough? */
	send_sig(SIGKILL, current, 0);
	return retval;
	}

	current->mm->start_stack =
	(unsigned long) create_aout32_tables((char __user *)bprm->p, bprm);
	if (!(orig_thr_flags & _TIF_32BIT)) {
	unsigned long pgd_cache = get_pgd_cache(current->mm->pgd);

	__asm__ __volatile__("stxa\t%0, [%1] %2\n\t"
	"membar #Sync"
	: /* no outputs */
	: "r" (pgd_cache),
	"r" (TSB_REG), "i" (ASI_DMMU));
	}
	start_thread32(regs, ex.a_entry, current->mm->start_stack);
	if (current->ptrace & PT_PTRACED)
	send_sig(SIGTRAP, current, 0);
	return 0;
	}

	/* N.B. Move to .h file and use code in fs/binfmt_aout.c? */
	static int load_aout32_library(struct file *file)
	{
	struct inode * inode;
	unsigned long bss, start_addr, len;
	unsigned long error;
	int retval;
	struct exec ex;

	inode = file->f_dentry->d_inode;

	retval = -ENOEXEC;
	error = kernel_read(file, 0, (char *) &ex, sizeof(ex));
	if (error != sizeof(ex))
	goto out;

	/* We come in here for the regular a.out style of shared libraries */
	if ((N_MAGIC(ex) != ZMAGIC && N_MAGIC(ex) != QMAGIC) \|\| N_TRSIZE(ex) \|\|
	N_DRSIZE(ex) \|\| ((ex.a_entry & 0xfff) && N_MAGIC(ex) == ZMAGIC) \|\|
	inode->i_size < ex.a_text+ex.a_data+N_SYMSIZE(ex)+N_TXTOFF(ex)) {
	goto out;
	}

	if (N_MAGIC(ex) == ZMAGIC && N_TXTOFF(ex) &&
	(N_TXTOFF(ex) < inode->i_sb->s_blocksize)) {
	printk("N_TXTOFF < BLOCK_SIZE. Please convert library\n");
	goto out;
	}

	if (N_FLAGS(ex))
	goto out;

	/* For QMAGIC, the starting address is 0x20 into the page. We mask
	this off to get the starting address for the page */

	start_addr = ex.a_entry & 0xfffff000;

	/* Now use mmap to map the library into memory. */
	down_write(&current->mm->mmap_sem);
	error = do_mmap(file, start_addr, ex.a_text + ex.a_data,
	PROT_READ \| PROT_WRITE \| PROT_EXEC,
	MAP_FIXED \| MAP_PRIVATE \| MAP_DENYWRITE,
	N_TXTOFF(ex));
	up_write(&current->mm->mmap_sem);
	retval = error;
	if (error != start_addr)
	goto out;

	len = PAGE_ALIGN(ex.a_text + ex.a_data);
	bss = ex.a_text + ex.a_data + ex.a_bss;
	if (bss > len) {
	down_write(&current->mm->mmap_sem);
	error = do_brk(start_addr + len, bss - len);
	up_write(&current->mm->mmap_sem);
	retval = error;
	if (error != start_addr + len)
	goto out;
	}
	retval = 0;
	out:
	return retval;
	}

	static int __init init_aout32_binfmt(void)
	{
	return register_binfmt(&aout32_format);
	}

	static void __exit exit_aout32_binfmt(void)
	{
	unregister_binfmt(&aout32_format);
	}

	module_init(init_aout32_binfmt);
	module_exit(exit_aout32_binfmt);