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From: Chris Friesen <cfriesen@nortelnetworks.com>
To: linuxppc-dev@lists.linuxppc.org, linux-kernel@vger.kernel.org
Subject: want to clarify powerpc assembly conventions in head.S and entry.S
Date: Sat, 10 Apr 2004 03:41:54 -0400	[thread overview]
Message-ID: <4077A542.8030108@nortelnetworks.com> (raw)



I'm doing some work in head.S and entry.S, and I just wanted to make 
sure that I had the conventions down.

According to the docs I read, r0 and r3-12 are caller-saves.  They seem 
to be saved in EXCEPTION_PROLOG_2 (head.S) and restored in 
ret_from_except() (entry.S).  Thus, if I add code in entry.S I should be 
able to use any of those registers, without having to worry about 
restoring them myself--correct?

Also, I'm a bit confused about the three instances of the following line 
in entry.S:

	stwcx.	r0,0,r1			/* to clear the reservation */

I don't see the corresponding lwarx instruction.  What reservation is it 
referring to?

Thanks,

Chris

             reply	other threads:[~2004-04-10  7:42 UTC|newest]

Thread overview: 15+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2004-04-10  7:41 Chris Friesen [this message]
2004-04-10 10:05 ` Benjamin Herrenschmidt
2004-04-11  5:14   ` Chris Friesen
2004-04-11  5:25     ` Benjamin Herrenschmidt
2004-04-12 14:31       ` Chris Friesen
2004-04-12 22:54         ` Benjamin Herrenschmidt
2004-04-13  4:06           ` Chris Friesen
2004-04-13  4:31           ` Chris Friesen
2004-04-12 23:30         ` want to clarify powerpc assembly conventions inhead.S " Benjamin Herrenschmidt
2004-04-12 15:01       ` want to clarify powerpc assembly conventions in head.S " Chris Friesen
2004-04-11  6:00     ` want to clarify powerpc assembly conventions in head.Sand entry.S Benjamin Herrenschmidt
2004-04-11  5:45   ` want to clarify powerpc assembly conventions in head.S and entry.S Chris Friesen
2004-04-13 15:10   ` Segher Boessenkool
2004-04-13 15:45   ` Segher Boessenkool
2004-04-10 10:30 ` want to clarify powerpc assembly conventions in head.S andentry.S Benjamin Herrenschmidt

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