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SubjectRe: [PATCH]x86_64: build and use GDT on copied compressed kernel
On 5/12/07, Eric W. Biederman <ebiederm@xmission.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.

YH
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