From: cinap_lenrek@gmx.de
To: 9fans@9fans.net
Subject: Re: [9fans] exec() question
Date: Sat, 16 Mar 2013 01:11:11 +0100 [thread overview]
Message-ID: <795419ca3771d16899c7b30e7c59ec84@rei2.9hal> (raw)
In-Reply-To: <6afdffa1957d1d4afe8c1a50369e4090@ladd.quanstro.net>
it also works in practice. the only catch was that fault386 does:
if(!user){
if(vmapsync(addr))
return;
-> if(addr >= USTKTOP)
panic("kernel fault: bad address pc=0x%.8lux addr=0x%.8lux", ureg->pc, addr);
if(up == nil)
panic("kernel fault: no user process pc=0x%.8lux addr=0x%.8lux", ureg->pc, addr);
}
so when moving the TSTK above the USTK, you need to change the addr >= USTKTOP
to addr >= TSTKTOP.
the arm kernels use USTKTOP as the end of userspace and size...
i think your approach with dynamically finding the address hole for the temporary
stack is the most flexibe and requires the least change. i think one can
ignore the additional computational overhead and get rid of the TSTK all
together.
--
cinap
next prev parent reply other threads:[~2013-03-16 0:11 UTC|newest]
Thread overview: 9+ messages / expand[flat|nested] mbox.gz Atom feed top
2013-03-15 17:03 erik quanstrom
2013-03-15 20:35 ` cinap_lenrek
2013-03-15 20:41 ` cinap_lenrek
2013-03-15 21:48 ` erik quanstrom
2013-03-15 21:51 ` erik quanstrom
2013-03-15 22:48 ` cinap_lenrek
2013-03-15 23:57 ` erik quanstrom
2013-03-16 0:11 ` cinap_lenrek [this message]
2013-03-17 1:56 ` erik quanstrom
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