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Date: Sun, 30 Mar 2014 17:01:39 +0200
From: Szabolcs Nagy <nsz@...t70.net>
To: musl@...ts.openwall.com
Subject: Re: Any plans on MMU-less support?
* Smirnov Vladimir <mapron1@...il.com> [2014-03-30 15:49:08 +0900]:
> I wonder if MUSL have such roadmap or there is any hackish way to
> add that support (may be some unoffitial patches).
> My problem that i've stucked with old gcc toolchain and uClibc
> supporting one widely used ARMv4 MMUless chip.
looking at uClibc the main differences in a no-mmu system:
fork is not available so related functions have to be changed/disabled
(vfork, daemon, wordexp, forkpty, pthread_atfork)
brk is not available so malloc needs to change
mmap may need MAP_UNINITIALIZED flag for performance
(and MAP_FIXED flag will fail)
memory management related things may need to be changed/disabled
(mprotect?,mlock,msync,..)
for dynamic linking ldso and libc startup code may need some change
(some targets (not arm) need fdpic or dsbt elf support)
(others can use a shared flat binary format)
pthread may need smaller default stack and more careful stack usage
arm startup code needs a change according to
http://git.uclibc.org/uClibc/tree/libc/sysdeps/linux/arm/crt1.S#n179
and you may need to fix various toolchain issues..
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