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Date: Sat, 12 May 2007 23:55:34 -0700 From: "Yinghai Lu" <yhlu.kernel@...il.com> To: "Eric W. Biederman" <ebiederm@...ssion.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 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. YH - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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