Why does it not use the sb register as per the ARM procedure call
standard? I guess this would be a non-trivial modification to
binutils/gcc?
Cheers, Adam
On 12 Apr 2002, Philip Blundell wrote:
> On Fri, 2002-04-12 at 06:15, Adam 'WeirdArms' Wiggins wrote:
> > A quick question. How do dynamic libraries on ARM Linux locate
> > their data segment, are all .data references relative to a register (sb
> > looks like it is for this purpose) or if a register contains the address
> > of the global offset table or what.
> > The reason I ask is that currently the glibc seems to map the
> > text/data of dynamic libraries with one mapping which is then splits. For
> > some work I'm doing I'd like to map the .text and .data at arbitarily
> > different points in the processes address space.
>
> That won't work with existing libraries. They depend on establishing a
> fixed offset between text and data during final link. You can relocate
> the object in its entirety but you can't move bits of it around
> independently.
>
> ucLinux does something along the lines that you are suggesting. One
> register is used as a static base pointer, which is set up by the kernel
> to point to the GOT or the start of .data.
>
> p.
>
>
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