* Question about arm multiple load and store instructions
@ 2008-10-21 3:43 loody
2008-10-21 12:47 ` Daniel Jacobowitz
0 siblings, 1 reply; 2+ messages in thread
From: loody @ 2008-10-21 3:43 UTC (permalink / raw)
To: binutils
Dear all:
While studying some arm assembly source codes, I find there is a
multiple load store instruction format like below:
LDM|STM{<cond>}<addressing_mode> <Rn>{!}, <registers>{^}
My question is:
What is the last ^ used for? I cannot find any explanation in arm's
instruction reference menu.
appreciate your help,
miloody
^ permalink raw reply [flat|nested] 2+ messages in thread* Re: Question about arm multiple load and store instructions
2008-10-21 3:43 Question about arm multiple load and store instructions loody
@ 2008-10-21 12:47 ` Daniel Jacobowitz
0 siblings, 0 replies; 2+ messages in thread
From: Daniel Jacobowitz @ 2008-10-21 12:47 UTC (permalink / raw)
To: loody; +Cc: binutils
On Tue, Oct 21, 2008 at 11:42:39AM +0800, loody wrote:
> Dear all:
> While studying some arm assembly source codes, I find there is a
> multiple load store instruction format like below:
> LDM|STM{<cond>}<addressing_mode> <Rn>{!}, <registers>{^}
>
> My question is:
> What is the last ^ used for? I cannot find any explanation in arm's
> instruction reference menu.
It's LDM(2) and LDM(3) in my copy of the ARM instruction reference.
Without PC, it means "load user registers instead of current
registers"; with PC it means "also copy SPSR to CPSR". They're both
for privileged use only.
--
Daniel Jacobowitz
CodeSourcery
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2008-10-21 3:43 Question about arm multiple load and store instructions loody
2008-10-21 12:47 ` Daniel Jacobowitz
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