Intel Itanium 9150M, Manual

Page: 189 / 420

3:180 Volume 3: Instruction Reference
mov indirect
mov — Move Indirect Register
Format: (
qp
) mov
r
1
=
ireg
[
r
3
] from_form M43
(
qp
) mov
ireg
[
r
3
] =
r
2
to_form M42
Description:
The source operand is copied to the destination register.
For move from indirect register, GR
r
3
is read and the value used as an index into the
register file specified by
ireg
(see Table 2-40 below). The indexed register is read and its
value is copied into GR
r
1
.
For move to indirect register, GR
r
3
is read and the value used as an index into the
register file specified by
ireg
. GR
r
2
is read and its value copied into the indexed register.
For all register files other than the region registers, bits {7:0} of GR
r
3
are used as the
index. For region registers, bits {63:61} are used. The remainder of the bits are
ignored.
Instruction and data breakpoint, performance monitor configuration, protection key,
and region registers can only be accessed at the most privileged level. Performance
monitor data registers can only be written at the most privileged level.
The CPU identification registers can only be read. There is no to_form of this
instruction.
For move to protection key register, the processor ensures uniqueness of protection
keys by checking new valid protection keys against all protection key registers. If any
matching keys are found, duplicate protection keys are invalidated.
Apart from the PMC and PMD register files, access of a non-existent register results in a
Reserved Register/Field fault. All accesses to the implementation-dependent portion of
PMC and PMD register files result in implementation dependent behavior but do not
fault.
Modifying a region register or a protection key register which is being used to translate:
• the executing instruction stream when PSR.it == 1, or
• the data space for an eager RSE reference when PSR.rt == 1
is an undefined operation.
Operation: if (PR[ qp ]) {
if ( ireg == RR_TYPE)
tmp_index = GR[ r
3
]{63:61};
else // all other register types
tmp_index = GR[ r
3
]{7:0};
Table 2-40. Indirect Register File Mnemonics
ireg Register File
cpuid Processor Identification Register
dbr Data Breakpoint Register
ibr Instruction Breakpoint Register
pkr Protection Key Register
pmc Performance Monitor Configuration Register
pmd Performance Monitor Data Register
rr Region Register