linux-kernel - Re: [PATCH]x86_64: build and use GDT on copied compressed kernel

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Date:	Sun, 13 May 2007 01:06:51 -0600
From:	ebiederm@...ssion.com (Eric W. Biederman)
To:	"Yinghai Lu" <yhlu.kernel@...il.com>
Cc:	"Andi Kleen" <ak@...e.de>,
	"Andrew Morton" <akpm@...ux-foundation.org>,
	"Vivek Goyal" <vgoyal@...ibm.com>,
	"Linux Kernel Mailing List" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH]x86_64: build and use GDT on copied compressed kernel

"Yinghai Lu" <yhlu.kernel@...il.com> writes:

> On 5/12/07, Eric W. Biederman <ebiederm@...ssion.com> wrote:
>>
>> For data segments we never use that GDT, it is only for the code
>> segment we use the GDT and that only to get us into 64bit mode.
>>
>
> after the patch
> linux:/home/yhlu/xx/xx/kernel/linux-2.6/arch/x86_64/boot/compressed #
> readelf -e vmlinux
> ...
> Section Headers:
>  [Nr] Name              Type             Address           Offset
>       Size              EntSize          Flags  Link  Info  Align
>  [ 0]                   NULL             0000000000000000  00000000
>       0000000000000000  0000000000000000           0     0     0
>  [ 1] .text             PROGBITS         0000000000000000  00100000
>       000000000032617c  0000000000000000  AX       0     0     16
>  [ 2] .rodata           PROGBITS         0000000000326180  00426180
>       0000000000000400  0000000000000000   A       0     0     32
>  [ 3] .eh_frame         PROGBITS         0000000000326580  00426580
>       0000000000000210  0000000000000000   A       0     0     8
>  [ 4] .data             PROGBITS         0000000000326790  00426790
>       0000000000000008  0000000000000000  WA       0     0     8
>  [ 5] .bss              NOBITS           00000000003267a0  00426798
>       000000000000b860  0000000000000000  WA       0     0     32
>  [ 6] .comment          PROGBITS         0000000000000000  00426798
>       0000000000000035  0000000000000000           0     0     1
>  [ 7] .shstrtab         STRTAB           0000000000000000  004267cd
>       0000000000000047  0000000000000000           0     0     1
>  [ 8] .symtab           SYMTAB           0000000000000000  00426a98
>       00000000000007c8  0000000000000018           9    60     8
>  [ 9] .strtab           STRTAB           0000000000000000  00427260
>       0000000000000350  0000000000000000           0     0     1
> Key to Flags:
>  W (write), A (alloc), X (execute), M (merge), S (strings)
>  I (info), L (link order), G (group), x (unknown)
>  O (extra OS processing required) o (OS specific), p (processor specific)
>
> after the patch, it seems .data section size still have 8 bytes.
> before that will 0x28.
> don't know what are the 8 bytes.

Probably variables in misc.c


Eric
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