Since we're now handling a == b generically, we no longer need
to do it by hand within target/arm/.
Backports commit 2900847ff4c862887af750935a875059615f509a from qemu
This will allow TBI to be used in user-only mode, as well as
avoid ping-ponging the softmmu TLB when TBI is in use. It
will also enable other armv8 extensions.
Backports commit 3a471103ac1823bafc907962dcaf6bd4fc0942a2 from qemu
Split out gen_top_byte_ignore in preparation of handling these
data accesses; the new tbflags field is not yet honored.
Backports commit 4a9ee99db38ba513bf1e8f43665b79c60accd017 from qemu
The branch target exception for guarded pages has high priority,
and only 8 instructions are valid for that case. Perform this
check before doing any other decode.
Clear BTYPE after all insns that neither set BTYPE nor exit via
exception (DISAS_NORETURN).
Not yet handled are insns that exit via DISAS_NORETURN for some
other reason, like direct branches.
Backports commit 51bf0d7aa91a9d4e2563240a42e6cb705cef84aa from qemu
Place this in its own field within ENV, as that will
make it easier to reset from within TCG generated code.
With the change to pstate_read/write, exception entry
and return are automatically handled.
Backports commit f6e52eaac13b6947f4406c127e3090c898e439c9 from qemu
A flawed test lead to the instructions always being treated as
unallocated encodings.
Fixes: https://bugs.launchpad.net/bugs/1813460
Backports commit 1cf86a8618644beb860951ff4383457ee88a7f4a from qemu
In disas_simd_indexed(), for the case of "complex fp", each indexable
element is a complex pair, so the total size is twice that indicated
in the 'size' field in the encoding. We were trying to do this
"double the size" operation with a left shift by 1, but this is
incorrect because the 'size' field is a MO_8/MO_16/MO_32/MO_64
value, and doubling the size should be done by a simple increment.
This meant we were mishandling FCMLA (by element) of values where
the real and imaginary parts are 32-bit floats, and would incorrectly
UNDEF this encoding. (No other insns take this code path, and for
16-bit floats it happens that 1 << 1 and 1 + 1 are both the same).
Backports commit eaefb97a8b97dbf42c016fe65b68b92f99a346f6 from qemu
The FCMLA (by element) instruction exists in the
"vector x indexed element" encoding group, but not in
the "scalar x indexed element" group. Correctly UNDEF
the unallocated encodings.
Backports commit 4dfabb6d568e6b315594d7d464dacaf3368aff60 from qemu
In the AdvSIMD scalar x indexed element and vector x indexed element
encoding group, the SDOT and UDOT instructions are vector only,
and their opcode is unallocated in the scalar group. Correctly
UNDEF this unallocated encoding.
Backports commit 4977986ca38fb1d5357532e1a8032b984047a369 from qemu
In the encoding groups
* floating-point data-processing (1 source)
* floating-point data-processing (2 source)
* floating-point data-processing (3 source)
* floating-point immediate
* floating-point compare
* floating-ponit conditional compare
* floating-point conditional select
bit 31 is M and bit 29 is S (and bit 30 is 0, already checked at
this point in the decode). None of these groups allocate any
encoding for M=1 or S=1. We checked this in disas_fp_compare(),
disas_fp_ccomp() and disas_fp_csel(), but missed it in disas_fp_1src(),
disas_fp_2src(), disas_fp_3src() and disas_fp_imm().
We also missed that in the fp immediate encoding the imm5 field
must be all zeroes.
Correctly UNDEF the unallocated encodings here.
Backports commit c1e20801f5ee53472dbf2757df605543f3f4ce0b from qemu
In the "add/subtract (extended register)" encoding group, the "opt"
field in bits [23:22] must be zero. Correctly UNDEF the unallocated
encodings where this field is not zero.
Backports commit 4f61106614410945b1d1c93081544ad5b13044fc from qemu
In the AdvSIMD load/store single structure encodings, the
non-post-indexed case should have zeroes in [20:16] (which is the
Rm field for the post-indexed case). Bit 31 must also be zero
(a check we got right in ldst_multiple but not here). Correctly
UNDEF these unallocated encodings.
Backports commit 9c72b68ad746a51f63822cffab4d144b5957823a from qemu
In the AdvSIMD load/store multiple structures encodings,
the non-post-indexed case should have zeroes in [20:16]
(which is the Rm field for the post-indexed case).
Correctly UNDEF the currently unallocated encodings which
have non-zeroes in those bits.
Backports commit e1f220811dbd5d85fb02ff286358f9ee6188938f from qemu
The PRFM prefetch insn in the load/store with imm9 encodings
requires idx field 0b00; we were underdecoding this by
only checking !is_unpriv (which is equivalent to idx != 2).
Correctly UNDEF the unallocated encodings where idx == 0b01
and 0b11 as well as 0b10.
Backports commit a80c4256543987ca88407349ee012a673a10a2ae from qemu
The "system instructions" and "system register move" subcategories
of "branches, exception generating and system instructions" for A64
only apply if bits [23:22] are zero; other values are currently
unallocated. Correctly UNDEF these unallocated encodings.
Backports commit 08d5e3bde6b4ad32996bf69d93aa66ae43d3f3ff from qemu
We will shortly want to talk about TBI as it relates to data.
Passing around a pair of variables is less convenient than a
single variable.
Backports commit 476a4692f06e381117fb7ad0d04d37c9c2612198 from qemu
Not that there are any stores involved, but why argue with ARM's
naming convention.
Backports commit bd889f4810839a2b68e339696ccf7c406cd62879 from qemu
Now properly signals unallocated for REV64 with SF=0.
Allows for the opcode2 field to be decoded shortly.
Backports commit 18de2813c35e359621a24a0a2a77570e83cb73b9 from qemu
There are 5 bits of state that could be added, but to save
space within tbflags, add only a single enable bit.
Helpers will determine the rest of the state at runtime.
Backports commit 0816ef1bfcd3ac53e7454b62ca436727887f6056 from qemu
Use "register" TBFLAG_ANY to indicate shared state between
A32 and A64, and "registers" TBFLAG_A32 & TBFLAG_A64 for
fields that are specific to the given cpu state.
Move ARM_TBFLAG_BE_DATA to shared state, instead of its current
placement within "Bit usage when in AArch32 state".
Backports commit aad821ac4faad369fad8941d25e59edf2514246b from qemu
Provide a trivial implementation with zero limited ordering regions,
which causes the LDLAR and STLLR instructions to devolve into the
LDAR and STLR instructions from the base ARMv8.0 instruction set.
Backports commit 2d7137c10fafefe40a0a049ff8a7bd78b66e661f from qemu
In handle_vec_simd_shli() we have a check:
if (size > 3 && !is_q) {
unallocated_encoding(s);
return;
}
However this can never be true, because we calculate
int size = 32 - clz32(immh) - 1;
where immh is a 4 bit field which we know cannot be all-zeroes.
So the clz32() return must be in {28,29,30,31} and the resulting
size is in {0,1,2,3}, and "size > 3" is never true.
This unnecessary code confuses Coverity's analysis:
in CID 1396476 it thinks we might later index off the
end of an array because the condition implies that we
might have a size > 3.
Remove the code, and instead assert that the size is in [0..3],
since the decode that enforces that is somewhat distant from
this function.
Backports commit f6c98f91f56031141a47f86225fdc30f0f9f84fb from qemu
For a sequence of loads or stores from a single register,
little-endian operations can be promoted to an 8-byte op.
This can reduce the number of operations by a factor of 8.
Backports commit 87f9a7f0c8d5122c36743885158782c2348a6d21 from qemu
This can reduce the number of opcodes required for certain
complex forms of load-multiple (e.g. ld4.16b).
Backports commit a7d8143aed2268f147cc1abfebc848ed6282a313 from qemu
Most of the v8 extensions are self-contained within the ISAR
registers and are not implied by other feature bits, which
makes them the easiest to convert.
Backports commit 962fcbf2efe57231a9f5df0ae0f40c05e35628ba from qemu
Use the existing helpers to determine if (1) the fpu is enabled,
(2) sve state is enabled, and (3) the current sve vector length.
Backports commit ced3155141755ba244c988c72c4bde32cc819670 from qemu
These insns require u=1; failed to include that in the switch
cases. This probably happened during one of the rebases just
before final commit.
Fixes: d17b7cdcf4e
Backports commit b8a4a96db3639e17ab5e5cdc14fca4b19fbf5b3b from qemu
Also fold the FPCR/FPSR state onto the same line as PSTATE,
and mention but do not dump disabled FPU state.
Backports commit 2bf5f3f91bb4e3faa2a19aec042138a938afbf6a from qemu
