Runtime code modification fails on arm

[Papalagi Pakeha]

On Wed, Nov 11, 2009 at 8:17 AM, Russell King - ARM Linux
<linux at arm.linux.org.uk> wrote:
> On Wed, Nov 11, 2009 at 02:08:27AM +1300, Papalagi Pakeha wrote:
>> Why is this happening? What is so different between x86 and ARM in
>> that field? I'm aware that my problem exhibits in userspace, not in
>> the kernel. I'm sorry if it's way off topic here.
>
> As others in this thread have pointed out, the
> kernel provides a call to deal with the I/D cache coherency problem
> which must be called _after_ _any_ modification of instructions
> whether they have been executed previously or not.

Thank you guys for the hint. However I can't find a ready to use
cacheflush() implemented in glibc (2.3.3) or dietlibc. Am I left on my
own implementing the userspace part of the syscall? I tried to figure
out how syscalls are implemented in dietlibc but there seems to be a
lot of preprocessor voodoo involved making it hard to understand...

Thanks!

PaPa