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kgzip ()
  • >> kgzip (8) ( FreeBSD man: Команды системного администрирования )

  • BSD mandoc
     

    NAME

    
    
    kgzip
    
     - compress a kernel
    
     
    

    SYNOPSIS

    [-cv ] [-f format ] [-l loader ] [-o output ] file  

    DESCRIPTION

    The utility compresses a kernel or some other bootable binary. Operation is in two phases as follows:

    1. A load image of the executable file is built which omits all but the `text' and `data' segments. This image is compressed using gzip(1) and output as data in relocatable object format.
    2. The object file is linked with a special self-hosting loader, producing an executable suitable for booting with either the second- or third-level bootstraps.

    Supported object formats are 32-bit ELF and a.out ZMAGIC.

    If the file operand has a `.o' suffix, input is assumed to be for the link phase, and the first phase is omitted.

    The options are:

    -c
    Omit the link phase.
    -v
    Display object file information.
    -f format
    Use format as the output format, where format is `aout' or `elf' The default format is ELF.
    -l loader
    Link loader as the loader.
    -o output
    Name the output file output The default is to use the input name with the suffix `.o' (for relocatables) or `.kgz' (for executables).

     

    NOTES

    Global variables equivalent to the following are defined in the output:
    struct kgz_hdr {
        char        ident[4];       /* identification: "KGZ" */
        uint32_t    dload;          /* decoded image load address */
        uint32_t    dsize;          /* decoded image size */
        uint32_t    isize;          /* image size in memory */
        uint32_t    entry;          /* entry point */
        uint32_t    nsize;          /* encoded image size */
    } kgz;
    
    uint8_t kgz_ndata[];            /* encoded data */
    

    The encoded data is simply gzip(1) output: a header (with no optional fields); compressed data; and 32-bit CRC and size values.  

    FILES

    /usr/lib/kgzldr.o
    The default loader

     

    EXIT STATUS

    Ex -std  

    SEE ALSO

    gzip(1), ld(1), a.out5, elf(5), boot(8), loader(8)  

    AUTHORS

    An Robert Nordier Aq rnordier@FreeBSD.org .  

    BUGS

    As symbols are lost, the usefulness of this utility for compressing kernels is limited to situations where loader(8) cannot be used; otherwise the preferred method of compressing a kernel is simply to gzip(1) it.


     

    Index

    NAME
    SYNOPSIS
    DESCRIPTION
    NOTES
    FILES
    EXIT STATUS
    SEE ALSO
    AUTHORS
    BUGS


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