Hi Amith,
I ran your code on my Big Endian Coldfire-5272 board and the output
I got was -
sizeof(Test) = 4
t1.w1 = 1234
t1.w2 = 5678
&t1.w1 = 314CD4
&t1.w2 = 314CD6
I think that should sort out all confusions..
--
Kishore
> -------- Original Message --------
> Subject: Endian'ess.
> Date: Thu, 08 Jul 2004 12:30:56 +0530
> From: amith <amith@multitech.co.in>
> To: KERNEL <kernelnewbies@nl.linux.org>
>
> Hi all ,
> a little off-topic.
>
> #include
> #include
>
> typedef struct test
> {
> unsigned short w1;
> unsigned short w2;
> }Test;
>
> Test t1;
>
> unsigned long temp = 0x12345678;
>
> main()
> {
> printf(" sizeof(Test) = %d\n",sizeof(Test));
> memcpy(&t1,&temp,4);
> printf(" t1.w1 = %X \n",t1.w1);
> printf(" t1.w2 = %X \n",t1.w2);
> printf(" &t1.w1 = %X \n",&t1.w1);
> printf(" t1.w2 = %X \n",&t1.w2);
> }
>
> output:
> t1.w1 = 5678
> Typo > t1.w1 = 1234
> shud be > t1.w2 = 1234
> &t1.w1 = 6004
> Typo > &t1.w1 = 6006
> shud be >&t1.w2 = 6006.
>
> i tried the above code on x86 and ARM , both gave me the same results.
> Both x86 and ARM are little-endian , or arent they? . Could someone
> explain this result with respect to the definition of Little Endian .
> which goes (one of them) as :
> Little Endian: the least significant byte of a multi-byte data field is
> stored in the lowest memmory address.
>
> Now, i have a couple of doubts :
> 1) i read somewhere on the net, that a processor can be set to either
> Little endian or Big endian, configurable ?
> 2) Could someone explain this with respect to the Little Endian
> definition given above.
>
> 6004 6006
> _________________
> | 5678 | 1234 |
> |________|________ |
> t1.w1 t1.w2
>
> Any good links to the Endianess would be great.
>
> thanks.
>
> cheers,
> Amith
>
>
> --
> Kernelnewbies: Help each other learn about the Linux kernel.
> Archive: http://mail.nl.linux.org/kernelnewbies/
> FAQ: http://kernelnewbies.org/faq/
>
>
--
Kernelnewbies: Help each other learn about the Linux kernel.
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