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Re: ecos-patches Digest 8 Apr 2003 01:14:35 -0000 Issue 209
- From: Pierre Habraken <Pierre dot Habraken at imag dot fr>
- To: Robin Farine <robin dot farine at acn-group dot ch>
- Cc: ecos-patches at sources dot redhat dot com, Jonathan Larmour <jifl at eCosCentric dot com>
- Date: Tue, 08 Apr 2003 07:30:51 +0200
- Subject: Re: ecos-patches Digest 8 Apr 2003 01:14:35 -0000 Issue 209
- Organization: Université Joseph Fourier
- References: <1049764475.5205.ezmlm@sources.redhat.com>
Robin Farine
> [...]
> > As far as I know, there is only one instance of each r0-r7,r15
> > shared by all Arm execution modes. Private ("banked") r8-r12
> > instances are provided in FIQ mode only. Private r13-r14 instances
> > are provided in all non user modes.
>
> Yes, you are right. However, I noticed another small thing: a few
> lines above you have:
>
> stmfd sp, {r8-r12, sp, lr}^ // get user mode regs
> sub sp, sp, #4*7
>
> The arm-arm says an stm instruction storing user-mode registers
> shouldn't be followed by an instruction that accesses a banked
> register (sp in this case). So you might add a nop between the stmfd
> and the sub for safety.
You are right, I forgot it. It lacks also in handle_IRQ_or_FIQ and after
the ldm in return_from_exception.
I'll fix this, do some tests and then send a new patch (with ChangeLog
entry added).
Thanks for your feedback.
Pierre
--
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Pierre HABRAKEN - mailto:Pierre dot Habraken at imag dot fr
Tél: 04 76 82 72 83 - Fax: 04 76 82 72 87
IMAG-LSR BP72 38402 SAINT MARTIN D'HERES Cedex
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