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Full Discussion: Bad Address when adding system call
Homework and Emergencies Emergency UNIX and Linux Support Bad Address when adding system call Post 302522330 by majid.merkava on Saturday 14th of May 2011 07:36:26 PM
Old 05-14-2011
Bad Address when adding system call
Hi guys.

I have downloaded kernel 2.6.38-5 to add a system call.
I did the following steps:

1. I have added my system call to system call table
Code:
<src folder>/arc/x86/kernel/syscall_table_32.S

.long sys_mycall

2. i have added the system cal number in
Code:
<src folder>/include/asm-generic/unistd.h

#define __NR_mycall 244
__SYSCALL(__NR_mycall, sys_mycall)

3. I have added the prototype to syscalls.h
Code:
<src follder>/include/linux/syscalls.h

asmlinkage long sys_mycall(long input);

4. here is my system call
Code:
asmlinkage long sys_mycall(long input)
{
return (input * 2);

}

5. I have edited the Makfiles
Now after compilation when i use it via syscall() it gives me "BAD ADDRESS" with errno set to 14.

What should i do?

---------- Post updated 2011-05-15 at 04:06 AM ---------- Previous update was 2011-05-14 at 08:39 PM ----------

On x86, system call number 244 is already taken by get_thread_area(), which takes as first argument a pointer to a struct user_desc:
Code:
int get_thread_area(struct user_desc *u_info);

You are passing a number instead of a pointer, the kernel is trying to interpret it as a pointer, it's determining that it points outside of your process, and returning -EFAULT.

According to this file
Code:
/usr/include/asm/unistd_32.h

the only system call number available is 251. so i changed my system call number to 251.
But this time it says: Function not implemented with errno = 38
 

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LEARN ABOUT CENTOS

locale::codes::langext

Locale::Codes::LangExt(3)				User Contributed Perl Documentation				 Locale::Codes::LangExt(3)

NAME

       Locale::Codes::LangExt - standard codes for language extension identification

SYNOPSIS

	  use Locale::Codes::LangExt;

	  $lext = code2langext('acm');		       # $lext gets 'Mesopotamian Arabic'
	  $code = langext2code('Mesopotamian Arabic'); # $code gets 'acm'

	  @codes   = all_langext_codes();
	  @names   = all_langext_names();

DESCRIPTION

       The "Locale::Codes::LangExt" module provides access to standard codes used for identifying language extensions, such as those as defined in
       the IANA language registry.

       Most of the routines take an optional additional argument which specifies the code set to use. If not specified, the default IANA language
       registry codes will be used.

SUPPORTED CODE SETS

       There are several different code sets you can use for identifying language extensions. A code set may be specified using either a name, or
       a constant that is automatically exported by this module.

       For example, the two are equivalent:

	  $lext = code2langext('acm','alpha');
	  $lext = code2langext('acm',LOCALE_LANGEXT_ALPHA);

       The codesets currently supported are:

       alpha
	   This is the set of three-letter (lowercase) codes from the IANA language registry, such as 'acm' for Mesopotamian Arabic.

	   This is the default code set.

ROUTINES

       code2langext ( CODE [,CODESET] )
       langext2code ( NAME [,CODESET] )
       langext_code2code ( CODE ,CODESET ,CODESET2 )
       all_langext_codes ( [CODESET] )
       all_langext_names ( [CODESET] )
       Locale::Codes::LangExt::rename_langext  ( CODE ,NEW_NAME [,CODESET] )
       Locale::Codes::LangExt::add_langext  ( CODE ,NAME [,CODESET] )
       Locale::Codes::LangExt::delete_langext  ( CODE [,CODESET] )
       Locale::Codes::LangExt::add_langext_alias  ( NAME ,NEW_NAME )
       Locale::Codes::LangExt::delete_langext_alias  ( NAME )
       Locale::Codes::LangExt::rename_langext_code  ( CODE ,NEW_CODE [,CODESET] )
       Locale::Codes::LangExt::add_langext_code_alias  ( CODE ,NEW_CODE [,CODESET] )
       Locale::Codes::LangExt::delete_langext_code_alias  ( CODE [,CODESET] )
	   These routines are all documented in the Locale::Codes::API man page.

SEE ALSO

       Locale::Codes
	   The Locale-Codes distribution.

       Locale::Codes::API
	   The list of functions supported by this module.

       http://www.iana.org/assignments/language-subtag-registry
	   The IANA language subtag registry.

AUTHOR

       See Locale::Codes for full author history.

       Currently maintained by Sullivan Beck (sbeck@cpan.org).

COPYRIGHT

	  Copyright (c) 2011-2013 Sullivan Beck

       This module is free software; you can redistribute it and/or modify it under the same terms as Perl itself.

perl v5.16.3							    2013-02-27						 Locale::Codes::LangExt(3)
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