Messages in this thread | | | From | (Eric W. Biederman) | Subject | Re: [PATCH]x86_64: build and use GDT on copied compressed kernel | Date | Sun, 13 May 2007 01:06:51 -0600 |
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"Yinghai Lu" <yhlu.kernel@gmail.com> writes:
> 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.
Probably variables in misc.c
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