hi Why is can't find a register in class ‘AREG’ while reloading ‘asm’ ?
hi all:
The codes is:
static int match(int len,const char * name,struct dir_entry * de)
{
register int same __asm__(ax);
if (!de || !de-inode || len NAME_LEN)
return 0;
if (len NAME_LEN de-name[len])
return 0;
*__asm__ (cld\n\t*
fs ; repe ; cmpsb\n\t
setz %%al
:=a (same)
:0 (0),S ((long) name),D ((long) de-name),c (len)
:cx,di,si);
return same;
}
When I make it, the error messages is:
*namei.c:35: error: can't find a register in class ‘AREG’ while reloading
‘asm’*
*
*
*This is why? *
*Thank you*
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Re: File system implementation
On Sat, May 25, 2013 at 10:47 AM, Dibyayan Chakraborty dib.cool...@gmail.com wrote: Hi, I want to implement a file system and integrate with my system. Now first i have to implement the code for disk-formatting(like populating the super_block , root inode etc). I want to see the source code for the ext3 file system for this purpose. Please tell me which file in the kernel source contains the implementation. You can start looking for e2fsprogs. You can find the details out there regarding the file-system formatting etc. ___ Kernelnewbies mailing list Kernelnewbies@kernelnewbies.org http://lists.kernelnewbies.org/mailman/listinfo/kernelnewbies ___ Kernelnewbies mailing list Kernelnewbies@kernelnewbies.org http://lists.kernelnewbies.org/mailman/listinfo/kernelnewbies
Re: hi Why is can't find a register in class ‘AREG’ while reloading ‘asm’ ?
I tried compiling this but I get slightly different error:
error: can’t find a register in class ‘CREG’ while reloading ‘asm’
this error is because of explicit clobber list which is not needed in this
case as all registers in clobber list are input list.
Note that it is CREG because it encounter cx in clobber list first.
-Rajat
On Mon, May 27, 2013 at 1:21 PM, lx lxlenovos...@gmail.com wrote:
hi all:
The codes is:
static int match(int len,const char * name,struct dir_entry * de)
{
register int same __asm__(ax);
if (!de || !de-inode || len NAME_LEN)
return 0;
if (len NAME_LEN de-name[len])
return 0;
*__asm__ (cld\n\t*
fs ; repe ; cmpsb\n\t
setz %%al
:=a (same)
:0 (0),S ((long) name),D ((long) de-name),c (len)
:cx,di,si);
return same;
}
When I make it, the error messages is:
*namei.c:35: error: can't find a register in class ‘AREG’ while reloading
‘asm’*
*
*
*This is why? *
*Thank you*
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RE: Kernel 64bit
Thanks Jonthan/Santosa, I could make a ISO image with Debian. My kernel was not booting earlier as I was booting wrong image. With new ISO image, still I did not get login prompt yet:(. Debugging the issue. ___ Kernelnewbies mailing list Kernelnewbies@kernelnewbies.org http://lists.kernelnewbies.org/mailman/listinfo/kernelnewbies
Re: hi Why is can't find a register in class
On Mon, 27 May 2013 15:51:26 +0800, lx said: When I make it, the error messages is: *namei.c:35: error: can't find a register in class *This is why? * Possibility 1: You screwed up the constrains on your asm and didn't leave the compiler any way to allocate CPU registers.. I havent had enough caffeine yet to check that in detail, you're on your own. ;) Possibility 2: Your compiler has a bug in it,. Such thinks happen. If you're using something older than gcc 4.8, either update it or get your vendor to update it, and then try again. If you're using 4.8 and your asm constraints have been verified as OK, please consider filing a gcc bug with your vendor and/or with the GCC team. (I had to keep a copy of gcc 4.6.3 around for a *long* time, because 4.7 would miscompile the NVidia module - I suspect the famous bug where it split a 64-bit operation that needed to be atomic. Then gcc developed another bug where the optimizer choked on one of the VirtualBox modules. Fedora finally shipped a patched 4.8 that didn't have either bug) pgpKfPKxYxyi2.pgp Description: PGP signature ___ Kernelnewbies mailing list Kernelnewbies@kernelnewbies.org http://lists.kernelnewbies.org/mailman/listinfo/kernelnewbies
Re: what's best way for playing with kernel configurations and source code
On Mon, May 27, 2013 at 12:01:20AM +0530, Sankar P wrote: On Sun, May 26, 2013 at 9:13 PM, Alshamlan, Mohammad malsh...@fiu.edu wrote: Hi everybody, How you can reconfigure and also modify your source code without affected your system? Please, if you want to suggest a virtual machine is the best option, then could you tell me why? Thanks in advance. Usually while kernel development, you do not overwrite your existing distro-provided kernel, but install your built kernel as a new option. This helps you in not losing access to your machine in case the kernel changes you have made are serious. If they're serious enough you might still break your file system and lose your data, so it's in any case good to have a backup. ;-) -- Thanks, Jonathan Neuschäfer ___ Kernelnewbies mailing list Kernelnewbies@kernelnewbies.org http://lists.kernelnewbies.org/mailman/listinfo/kernelnewbies
lookup function return value in inode_operations
Hi,
What is the return value of the lookup function under the
inode_operations struct ? I see that the function gets a dentry as a
parameter, which can be used to associate an inode. For example:
If we have:
struct dentry * somefs_lookup(struct inode *parent_inode,
struct dentry *child_dentry, unsigned int flags)
{
d_add(child_dentry, inode);
}
so, what is the meaning of the return struct dentry in this lookup
function ? In some simple filesystems that I saw, they return NULL
here and it seem to work just fine. So what is that the lookup
function should do if we are implementing our own filesystem ?
Thanks.
--
Sankar P
http://psankar.blogspot.com
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mss for tcp segment
Hi, What is the value of mss for tcp segment. ___ Kernelnewbies mailing list Kernelnewbies@kernelnewbies.org http://lists.kernelnewbies.org/mailman/listinfo/kernelnewbies
