how to use adb to perform hp-ux kernel modification

[amit mehta_2]

Hi All,

How can i perform hp-ux kernel modification using adb ?
i have a kernel module for which i have access to source file and corrosponding header files.I need to change the value of one of the macro defined in one of the header file.so instead of re-building entire kernel,can this be done by adb ? if yes then how ?

Thanks,
~amit

[Court Campbell]

> How can i perform hp-ux kernel modification using adb ?

You don't.

[A. Clay Stephenson]

While in principle it might be possible, in practice, it would be very difficult. There are also cases where it would be impossible. For example, suppose that the macro controlled the size of an array. There is no way using adb to allocate a larger array "on the fly". Typically adb reads the symbol table in /stand/vmunix and uses that to find the offset into the kernel memory image (/dev/kmem) and then writes or reads values to make changes "on the fly". Using adb makes sense in the case where all you are doing is changing a value but that doesn't seem to be the case here. It's also possible that this macro affects many kernel data structures at once so the consequences could be disastrous unless several values were changed simultaneously. If you have the source code then using adb doesn't make sense; you need to recompile the module. If this is a dynamically loaded module then it could be changed "on the fly".

Meaning no insult, this is one of those areas that if you have to ask then you are almost certainly not the person to be doing this.

[A. Clay Stephenson]

Here's the general method for modifying a kernel value "on the fly":

echo 'some_kernel_value/W 0ff' | adb -w -k /stand/vmunix /dev/kmem

which would modify "some_kernel_value" to the value 0xFF. /W tells adb the type of variable.

[Dennis Handly]

As Clay mentioned you can only do certain changes with adb. You can only modify values and instructions. While the former isn't hard, the latter would take an expert.

Better to rebuild your module.

(It would be helpful if you had some spaces after your commas and periods.)