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    SubjectRe: syscall descriptor table
    On 04/05/2012 11:55 PM, Xin Tong wrote:
    > Can anyone please describe to me how x86 syscall works ( i.e. how it
    > is dispatched to the correct function) on x86 ?
    >
    > mov $1, %eax ;; __NR_exit = 1
    > mov $42, %ebx ;; status = 42
    > sysenter ;; perform the syscall!
    >
    > what does the sysenter instruction do ? what is the difference aganst int 0x80.

    Please refer to some processor manual. For example: Intel 64 and IA-32
    Architectures Software Developer’s Manual. For the entry point see
    ia32_sysenter_target in arch/x86/kernel/entry_32.S for x86_32 or
    arch/x86/ia32/ia32entry.S for x86_64 with 32-bit binary.

    regards,
    --
    js
    suse labs

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