aditya (email@example.com) writes:
> I have a doubt w.r.t. Linux on mips.
> in mips there is a instruction jal which jumps across 256 MB
> boundry. but this is a restriction as shared text (libraries) and
> private text (program's text) should be located within 256 MB
> boundry. Is it true ??
In the usual Linux address map it isn't true: library code might
easily fail to be in the same 256Mbyte 'chunk' of virtual memory.
Linux/MIPS applications implement calls between modules (and for
relocatable libraries, calls inside modules too) with an indirection
through a table of pointers - the "global access table" or GOT.
We normally think of this as a way of providing suitably
position-independent code... There's a fair description of this in my
book "See MIPS Run" under the heading "Sharing Library Code in the
MIPS ABI" - Chapter 10 or so.
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