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Re: Adding user mode support to Arm HAL

Mark Salter wrote:
> [...]
> >          // now save pre-exception r0-r7 on current stack
> >          ldmfd   r3,{r0-r5}
> >          stmfd   sp!,{r0-r7}
>            ^^^^^^^^^^^^^^^^^^^
> 
> Is this really saving user mode r0-r7? Looks like its saving svc mode
> regs.

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.

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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