Hi,
I think that there's a bug in the generation of ARM vmsr instructions in
binutils 2.2. If I try to assemble:-
mov r0, #(0x1 << 30)
vmsr fpexc, r0
to enable the neon unit on a cortex-a9 then I get an error
Error: operand 0 must be FPSCR -- `vmsr fpexc,r0'
Because in gas/config/tc-arm.c we have:-
static void
do_vmsr (void)
{
unsigned Rt = inst.operands[1].reg;
if (thumb_mode)
reject_bad_reg (Rt);
else if (Rt == REG_PC)
{
inst.error = BAD_PC;
return;
}
if (inst.operands[0].reg != 1)
first_error (_("operand 0 must be FPSCR"));
inst.instruction |= (Rt << 12);
}
But, according to the ARM Architecture Reference Manual:-
VMSR<c><q> <spec_reg>, <Rt>
where:
<c><q> See Standard assembler syntax fields on page A8-7.
<spec_reg> Is one of:
FPSID reg = '0000'
FPSCR reg = '0001'
FPEXC reg = '1000'.
If the Common VFP subarchitecture is implemented, see Subarchitecture
additions to the
VFP system registers on page AppxB-15 for additional values of
<spec_reg>.
<Rt> The general-purpose register to be transferred to <spec_reg>.
I think this is a bug, unless there's some reason for disallowing fpsid & fpexc
that I haven't found....
Thanks,
Clive
Clive Davies
Altera Europe
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