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

[Christos Zoulas]

Committed, I kept the word "kernel" in the name.

christos

> On Mar 17, 2025, at 12:10 PM, Jens Remus <jremus at linux.ibm.com> wrote:
> 
> 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 <mailto:jremus at de.ibm.com>
> 
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