[File] [PATCH] Magdir/linux S390 kernel image; Show version

[Jens Remus]

On 17.03.2025 14:52, Jens Remus wrote:
> Linux kernel S390 boot executable images have the magic string "S390EP"
> at 0x10008 (since v3.2). [1]  The parameter area has a pointer to the
> kernel version at 0x10428 (since v5.3, which has been 0 since v3.2) [2]
> Based on Vasily's implementation from his commit message of his Linux
> kernel commit 6abe28197024 ("s390: enable detection of kernel version
> from bzImage").
> 
> While at it update the identifier to "Linux kernel S390 boot executable
> Image", to align it to the other architectures.

Marc brought up (offline), that changing the identifier from "Linux
S390" to "Linux kernel S390 boot executable Image" might break existing
scripts that grep for "Linux S390".  He suggested that a compromise
might be to change it to "Linux S390 kernel boot executable Image",
which only appends to the existing identifier.

> [1]: Linux kernel, arch/s390/boot/head.S, EP_OFFSET and EP_STRING.
> [2]: Linux kernel, arch/s390/include/asm/setup.h, struct parmarea,
>       kernel_version.
> 
> Co-authored-by: Vasily Gorbik <gor at linux.ibm.com>
> Signed-off-by: Jens Remus <jremus at linux.ibm.com>
> ---
>   magic/Magdir/linux | 9 ++++++++-
>   1 file changed, 8 insertions(+), 1 deletion(-)
> 
> diff --git a/magic/Magdir/linux b/magic/Magdir/linux
> index d2e3aaa1d68c..4afcc0736707 100644
> --- a/magic/Magdir/linux
> +++ b/magic/Magdir/linux
> @@ -456,7 +456,9 @@
>   ############################################################################
>   # Linux S390 kernel image
>   # Created by: Jan Kaluza <jkaluza at redhat.com>
> -8 string \x02\x00\x00\x18\x60\x00\x00\x50\x02\x00\x00\x68\x60\x00\x00\x50\x40\x40\x40\x40\x40\x40\x40\x40 Linux S390
> +# Update: Jens Remus <jremus at linux.ibm.com> based on Vasily Gorbik <gor at linux.ibm.com>
> +# Linux kernel: arch/s390/boot/head.S and arch/s390/include/asm/setup.h
> +8 string \x02\x00\x00\x18\x60\x00\x00\x50\x02\x00\x00\x68\x60\x00\x00\x50\x40\x40\x40\x40\x40\x40\x40\x40 Linux kernel S390 boot executable Image
>   >0x00010000 search/b/4096 \x00\x0a\x00\x00\x8b\xad\xcc\xcc
>   # 64bit
>   >>&0 string \xc1\x00\xef\xe3\xf0\x68\x00\x00 Z10 64bit kernel
> @@ -468,6 +470,11 @@
>   >>&0 string \x81\x00\xc8\x80\x00\x00\x00\x00 Z9-109 32bit kernel
>   >>&0 string \x80\x00\x20\x00\x00\x00\x00\x00 Z990 32bit kernel
>   >>&0 string \x80\x00\x00\x00\x00\x00\x00\x00 Z900 32bit kernel
> +# Linux kernel v3.2+
> +>0x10008		string		S390EP
> +# Linux kernel v5.3+
> +>>0x10428		ubequad		>0
> +>>>(0x10428.Q)		string		>\0	\b, version %s
>   
>   ############################################################################
>   # Linux ARM compressed kernel image

Regards,
Jens
-- 
Jens Remus
Linux on Z Development (D3303)
+49-7031-16-1128 Office
jremus at de.ibm.com

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