[Bug exp/21717] "print $fpscr" says "<unavailable>" until some VFP data register is printed

["b7.10110111 at gmail dot com" <sourceware-bugzilla at sourceware dot org>]

https://sourceware.org/bugzilla/show_bug.cgi?id=21717

--- Comment #4 from Ruslan <b7.10110111 at gmail dot com> ---
OK, here's what happens: in arm_linux_fetch_inferior_registers the last branch

      else if (tdep->vfp_register_count > 0
               && regno >= ARM_D0_REGNUM
               && regno <= ARM_D0_REGNUM + tdep->vfp_register_count)
        fetch_vfp_regs (regcache);

has tdep->vfp_register_count==16, while regno=90 (ARM_FPSCR_REGNUM). As
ARM_D0_REGNUM==58, the call to fetch_vfp_regs(regcache) doesn't happen.

What seems to mismatch here is that VFP register count is 16, i.e. D0-D15, but
enum gdb_regnum contains values up to ARM_D31_REGNUM, thus the next value,
ARM_FPSCR_REGNUM, is not reached by the comparisons. Thus it's not surprising
that the code does work on VFPv3, where there're 32 VFP double-precision
registers.

I suppose there should be a "|| regno==ARM_FPSCR_REGNUM" or something like that
inside the if-condition.

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