[PATCH, ARM] Fix out-of-range immediate assembly errors on 64-bit hosts

[Julian Brown]

Hi,

Nick Clifton wrote:
> Hi Julian,
> 
>> I think it'd probably work, but maybe it'd be better to add a 
>> bounds-checked/non-bounds-checked argument to parse_immediate() or 
>> write a non-bounds-checking version of the function instead?
> 
> I think that this would be the best solution.  It makes the meaning of 
> the arguments passed to parse_immediate more obvious.
[...]
> 
>>> I am a little bit confused here.  How is ((x >> 16) >> 16) different 
>>> from (x >> 32) ?  If not, then why express it that way ?
>>
>> If sizeof(exp.X_add_number)==4 (i.e. on 32-bit hosts), then I think 
>> that writing (x >> 32) is invalid C (which isn't very nice, even if 
>> that code would never be executed).

> [...] Or just have the comment in the code.

Here's a (rather belated) new version of the patch which adds 
bounds-checking and non-bounds-checking forms to parse_immediate, 
avoiding the previous nastiness with INT_MIN/INT_MAX.

Tested with "make check" on x86 and x86_64 with cross to arm-none-eabi.

OK? (for mainline? CSL branch?)

Cheers,

Julian

ChangeLog

     gas/
     * config/tc-arm.c (parse_immediate): Add BOUNDED parameter, rename
     to...
     (parse_immediate_maybe_bounded): This. Only bounds-check if BOUNDED
     is true.
     (parse_immediate_bounded): New function, with same arguments and
     semantics as previous parse_immediate.
     (parse_immediate_unbounded): New function. Parse an unbounded
     integer (with sizeof (exp.X_add_number)).
     (parse_big_immediate): Allow for 64-bit exp.X_add_number when
     parsing 64-bit immediates.
     (parse_address_main): Use parse_immediate_bounded not
     parse_immediate.
     (parse_ror): Likewise.
     (parse_operands): Likewise. For Neon immediates, use
     parse_immediate_unbounded. Add new local po_imm_unb_or_fail macro.

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