This commit makes handle_q_memtag, handle_q_isaddresstagged, and
handle_Q_memtag stubs build for system mode, allowing all GDB
'memory-tag' subcommands to work with QEMU gdbstub on aarch64 system
mode.
Resolves: https://gitlab.com/qemu-project/qemu/-/issues/620
Signed-off-by: Gustavo Romero <gustavo.romero@linaro.org>
Reviewed-by: Richard Henderson <richard.henderson@linaro.org>
Message-Id: <20240906143316.657436-3-gustavo.romero@linaro.org>
[AJB: add #ifdef CONFIG_TCG guards]
Signed-off-by: Alex Bennée <alex.bennee@linaro.org>
Message-Id: <20240910173900.4154726-8-alex.bennee@linaro.org>
Use cpu_mmu_index() to determine the specific translation regime (MMU
index) before probing addresses using allocation_tag_mem_probe().
Currently, the MMU index is hardcoded to 0 and only works for user mode.
By obtaining the specific MMU index according to the translation regime,
future use of the stubs relying on allocation_tag_mem_probe in other
regimes will be possible, like in EL1.
This commit also changes the ptr_size value passed to
allocation_tag_mem_probe() from 8 to 1. The ptr_size parameter actually
represents the number of bytes in the memory access (which can be as
small as 1 byte), rather than the number of bits used in the address
space pointed to by ptr.
Signed-off-by: Gustavo Romero <gustavo.romero@linaro.org>
Reviewed-by: Richard Henderson <richard.henderson@linaro.org>
Message-Id: <20240906143316.657436-2-gustavo.romero@linaro.org>
Signed-off-by: Alex Bennée <alex.bennee@linaro.org>
Message-Id: <20240910173900.4154726-7-alex.bennee@linaro.org>
In vfp.decode we have the names of the VFNMA and VFNMS instructions
the wrong way around. The architecture says that bit 6 is the 'op'
bit, which is 1 for VFNMA and 0 for VFNMS, but we label these two
lines of decode the other way around. This doesn't cause any
user-visible problem because in the handling of these functions in
translate-vfp.c we give VFNMA the behaviour specified for VFNMS and
vice-versa, but it's confusing when reading the code.
Switch the names of the VFP VFNMA and VFNMS instructions in
the decode file and flip the behaviour also.
NB: the instructions VFMA and VFMS *are* decoded with op=0 for
VFMA and op=1 for VFMS; the confusion probably arose because
we assumed VFNMA and VFNMS to be the same way around.
Resolves: https://gitlab.com/qemu-project/qemu/-/issues/2536
Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
Message-id: 20240830152156.2046590-1-peter.maydell@linaro.org
Reviewed-by: Richard Henderson <richard.henderson@linaro.org>
Now that we've implemented the required behaviour for FEAT_EBF16, we
can enable it for the "max" CPU type, list it in our documentation,
and delete a TODO comment about it being missing.
Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
Reviewed-by: Richard Henderson <richard.henderson@linaro.org>
Implement the FPCR.EBF=1 semantics for bfdotadd() operations:
* is_ebf() sets up fpst and fpst_odd
* bfdotadd_ebf() implements the fused paired-multiply-and-add
operation that we need
The paired-multiply-and-add is similar to f16_dotadd() and
we use the same trick here as in that function, but the inputs
here are bfloat16 rather than float16.
Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
Reviewed-by: Richard Henderson <richard.henderson@linaro.org>
We use bfdotadd() in four callsites for various helper functions. Currently
this all assumes that we have the FPCR.EBF=0 semantics. For FPCR.EBF=1
we will need to:
* call a different routine to bfdotadd() because we need to do a
fused multiply-add rather than separate multiply and add steps
* use a different float_status that honours the FPCR rounding mode
and denormal-flushing fields
* pass in an extra float_status that has been set up to perform
round-to-odd rounding
To prepare for this, refactor all the callsites so that instead of
for (...) {
x = bfdotadd(...);
}
they are:
float_status fpst, fpst_odd;
if (is_ebf(env, &fpst, &fpst_odd)) {
for (...) {
x = bfdotadd_ebf(..., &fpst, &fpst_odd);
}
} else {
for (...) {
x = bfdotadd(..., &fpst);
}
}
For the moment the is_ebf() function always returns false, sets up
fpst for EBF=0 semantics and never sets up fpst_odd; bfdotadd_ebf()
will assert if called. We'll fill in the handling for EBF=1 in the
next commit.
This change should be a zero-behaviour-change refactor.
Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
Reviewed-by: Richard Henderson <richard.henderson@linaro.org>
Pass the env pointer through to the gvec_bfmmla helper,
so we can use it to add support for FEAT_EBF16.
Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
Reviewed-by: Richard Henderson <richard.henderson@linaro.org>
Pass the env pointer through to the gvec_bfdot_idx helper,
so we can use it to add support for FEAT_EBF16.
Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
Reviewed-by: Richard Henderson <richard.henderson@linaro.org>
Pass the env pointer through to the gvec_bfdot helper,
so we can use it to add support for FEAT_EBF16.
Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
Reviewed-by: Richard Henderson <richard.henderson@linaro.org>
To implement the FEAT_EBF16 semantics, we are going to need
the CPUARMState env pointer in every helper function which calls
bfdotadd().
Pass the env pointer through from generated code to the sme_bfmopa
helper. (We'll add the code that uses it when we've adjusted
all the helpers to have access to the env pointer.)
Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
Reviewed-by: Richard Henderson <richard.henderson@linaro.org>
FEAT_EBF16 adds one new bit to the FPCR floating point control
register. Allow this bit to be read and written when the ID
registers indicate the presence of the feature.
Note that because this new bit is not in FPSCR_FPCR_MASK the bit is
not visible in the AArch32 FPSCR, and FPSCR writes do not affect it.
Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
Reviewed-by: Richard Henderson <richard.henderson@linaro.org>
Our current usage of MMU indexes when EL3 is AArch32 is confused.
Architecturally, when EL3 is AArch32, all Secure code runs under the
Secure PL1&0 translation regime:
* code at EL3, which might be Mon, or SVC, or any of the
other privileged modes (PL1)
* code at EL0 (Secure PL0)
This is different from when EL3 is AArch64, in which case EL3 is its
own translation regime, and EL1 and EL0 (whether AArch32 or AArch64)
have their own regime.
We claimed to be mapping Secure PL1 to our ARMMMUIdx_EL3, but didn't
do anything special about Secure PL0, which meant it used the same
ARMMMUIdx_EL10_0 that NonSecure PL0 does. This resulted in a bug
where arm_sctlr() incorrectly picked the NonSecure SCTLR as the
controlling register when in Secure PL0, which meant we were
spuriously generating alignment faults because we were looking at the
wrong SCTLR control bits.
The use of ARMMMUIdx_EL3 for Secure PL1 also resulted in the bug that
we wouldn't honour the PAN bit for Secure PL1, because there's no
equivalent _PAN mmu index for it.
We could fix this in one of two ways:
* The most straightforward is to add new MMU indexes EL30_0,
EL30_3, EL30_3_PAN to correspond to "Secure PL1&0 at PL0",
"Secure PL1&0 at PL1", and "Secure PL1&0 at PL1 with PAN".
This matches how we use indexes for the AArch64 regimes, and
preserves propirties like being able to determine the privilege
level from an MMU index without any other information. However
it would add two MMU indexes (we can share one with ARMMMUIdx_EL3),
and we are already using 14 of the 16 the core TLB code permits.
* The more complicated approach is the one we take here. We use
the same MMU indexes (E10_0, E10_1, E10_1_PAN) for Secure PL1&0
than we do for NonSecure PL1&0. This saves on MMU indexes, but
means we need to check in some places whether we're in the
Secure PL1&0 regime or not before we interpret an MMU index.
The changes in this commit were created by auditing all the places
where we use specific ARMMMUIdx_ values, and checking whether they
needed to be changed to handle the new index value usage.
Note for potential stable backports: taking also the previous
(comment-change-only) commit might make the backport easier.
Cc: qemu-stable@nongnu.org
Resolves: https://gitlab.com/qemu-project/qemu/-/issues/2326
Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
Tested-by: Bernhard Beschow <shentey@gmail.com>
Reviewed-by: Richard Henderson <richard.henderson@linaro.org>
Message-id: 20240809160430.1144805-3-peter.maydell@linaro.org
We have a long comment describing the Arm architectural translation
regimes and how we map them to QEMU MMU indexes. This comment has
got a bit out of date:
* FEAT_SEL2 allows Secure EL2 and corresponding new regimes
* FEAT_RME introduces Realm state and its translation regimes
* We now model the Cortex-R52 so that is no longer a hypothetical
* We separated Secure Stage 2 and NonSecure Stage 2 MMU indexes
* We have an MMU index per physical address spacea
Add the missing pieces so that the list of architectural translation
regimes matches the Arm ARM, and the list and count of QEMU MMU
indexes in the comment matches the enum.
Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
Tested-by: Bernhard Beschow <shentey@gmail.com>
Reviewed-by: Richard Henderson <richard.henderson@linaro.org>
Message-id: 20240809160430.1144805-2-peter.maydell@linaro.org
AdvSIMD instructions are supposed to zero bits beyond 128.
Affects SSHLL, USHLL, SSHLL2, USHLL2.
Cc: qemu-stable@nongnu.org
Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
Message-id: 20240717060903.205098-15-richard.henderson@linaro.org
Reviewed-by: Peter Maydell <peter.maydell@linaro.org>
Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
With pcrel, we cannot check the guarded page bit at translation
time, as different mappings of the same physical page may or may
not have the GP bit set.
Instead, add a couple of helpers to check the page at runtime,
after all other filters that might obviate the need for the check.
The set_btype_for_br call must be moved after the gen_a64_set_pc
call to ensure the current pc can still be computed.
Reviewed-by: Philippe Mathieu-Daudé <philmd@linaro.org>
Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
Message-id: 20240802003028.795476-1-richard.henderson@linaro.org
Reviewed-by: Peter Maydell <peter.maydell@linaro.org>
Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
Changed val from uint64_t to a pointer to uint64_t in hvf_sysreg_read,
but didn't change its usage in hvf_sysreg_read_cp call.
Fixes: e9e640148c ("hvf: arm: Raise an exception for sysreg by default")
Reported-by: Richard Henderson <richard.henderson@linaro.org>
Signed-off-by: Akihiko Odaki <akihiko.odaki@daynix.com>
Reviewed-by: Philippe Mathieu-Daudé <philmd@linaro.org>
Message-ID: <20240802-hvf-v1-1-e2c0292037e5@daynix.com>
Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
The FMOPA (widening) SME instruction takes pairs of half-precision
floating point values, widens them to single-precision, does a
two-way dot product and accumulates the results into a
single-precision destination. We don't quite correctly handle the
FPCR bits FZ and FZ16 which control flushing of denormal inputs and
outputs. This is because at the moment we pass a single float_status
value to the helper function, which then uses that configuration for
all the fp operations it does. However, because the inputs to this
operation are float16 and the outputs are float32 we need to use the
fp_status_f16 for the float16 input widening but the normal fp_status
for everything else. Otherwise we will apply the flushing control
FPCR.FZ16 to the 32-bit output rather than the FPCR.FZ control, and
incorrectly flush a denormal output to zero when we should not (or
vice-versa).
(In commit 207d30b5fd we tried to fix the FZ handling but
didn't get it right, switching from "use FPCR.FZ for everything" to
"use FPCR.FZ16 for everything".)
Pass the CPU env to the sme_fmopa_h helper instead of an fp_status
pointer, and have the helper pass an extra fp_status into the
f16_dotadd() function so that we can use the right status for the
right parts of this operation.
Cc: qemu-stable@nongnu.org
Fixes: 207d30b5fd ("target/arm: Use FPST_F16 for SME FMOPA (widening)")
Resolves: https://gitlab.com/qemu-project/qemu/-/issues/2373
Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
Reviewed-by: Richard Henderson <richard.henderson@linaro.org>
When determining the current vector length, the SMCR_EL2.LEN and
SVCR_EL2.LEN settings should only be considered if EL2 is enabled
(compare the pseudocode CurrentSVL and CurrentNSVL which call
EL2Enabled()).
We were checking against ARM_FEATURE_EL2 rather than calling
arm_is_el2_enabled(), which meant that we would look at
SMCR_EL2/SVCR_EL2 when in Secure EL1 or Secure EL0 even if Secure EL2
was not enabled.
Use the correct check in sve_vqm1_for_el_sm().
Cc: qemu-stable@nongnu.org
Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
Reviewed-by: Richard Henderson <richard.henderson@linaro.org>
Message-id: 20240722172957.1041231-5-peter.maydell@linaro.org
The function tszimm_esz() returns a shift amount, or possibly -1 in
certain cases that correspond to unallocated encodings in the
instruction set. We catch these later in the trans_ functions
(generally with an "a-esz < 0" check), but before we do the
decodetree-generated code will also call tszimm_shr() or tszimm_sl(),
which will use the tszimm_esz() return value as a shift count without
checking that it is not negative, which is undefined behaviour.
Avoid the UB by checking the return value in tszimm_shr() and
tszimm_shl().
Cc: qemu-stable@nongnu.org
Resolves: Coverity CID 1547617, 1547694
Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
Reviewed-by: Richard Henderson <richard.henderson@linaro.org>
Message-id: 20240722172957.1041231-4-peter.maydell@linaro.org
The UMOPA/UMOPS instructions are supposed to multiply unsigned 8 or
16 bit elements and accumulate the products into a 64-bit element.
In the Arm ARM pseudocode, this is done with the usual
infinite-precision signed arithmetic. However our implementation
doesn't quite get it right, because in the DEF_IMOP_64() macro we do:
sum += (NTYPE)(n >> 0) * (MTYPE)(m >> 0);
where NTYPE and MTYPE are uint16_t or int16_t. In the uint16_t case,
the C usual arithmetic conversions mean the values are converted to
"int" type and the multiply is done as a 32-bit multiply. This means
that if the inputs are, for example, 0xffff and 0xffff then the
result is 0xFFFE0001 as an int, which is then promoted to uint64_t
for the accumulation into sum; this promotion incorrectly sign
extends the multiply.
Avoid the incorrect sign extension by casting to int64_t before
the multiply, so we do the multiply as 64-bit signed arithmetic,
which is a type large enough that the multiply can never
overflow into the sign bit.
(The equivalent 8-bit operations in DEF_IMOP_32() are fine, because
the 8-bit multiplies can never overflow into the sign bit of a
32-bit integer.)
Cc: qemu-stable@nongnu.org
Resolves: https://gitlab.com/qemu-project/qemu/-/issues/2372
Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
Reviewed-by: Richard Henderson <richard.henderson@linaro.org>
Message-id: 20240722172957.1041231-3-peter.maydell@linaro.org
For an instruction which accesses a 128-bit element tile when
the SVL is also 128 (for example MOV z0.Q, p0/M, ZA0H.Q[w0,0]),
we will assert in get_tile_rowcol():
qemu-system-aarch64: ../../tcg/tcg-op.c:926: tcg_gen_deposit_z_i32: Assertion `len > 0' failed.
This happens because we calculate
len = ctz32(streaming_vec_reg_size(s)) - esz;$
but if the SVL and the element size are the same len is 0, and
the deposit operation asserts.
In this case the ZA storage contains exactly one 128 bit
element ZA tile, and the horizontal or vertical slice is just
that tile. This means that regardless of the index value in
the Ws register, we always access that tile. (In pseudocode terms,
we calculate (index + offset) MOD 1, which is 0.)
Special case the len == 0 case to avoid hitting the assertion
in tcg_gen_deposit_z_i32().
Cc: qemu-stable@nongnu.org
Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
Reviewed-by: Richard Henderson <richard.henderson@linaro.org>
Message-id: 20240722172957.1041231-2-peter.maydell@linaro.org
This is identical with commit 30a1690f24 ("hvf: arm: Do not advance
PC when raising an exception") but for writes instead of reads.
Fixes: a2260983c6 ("hvf: arm: Add support for GICv3")
Signed-off-by: Akihiko Odaki <akihiko.odaki@daynix.com>
Reviewed-by: Peter Maydell <peter.maydell@linaro.org>
Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
Setting pmu property used to have no effect for hvf so fix it.
Signed-off-by: Akihiko Odaki <akihiko.odaki@daynix.com>
Reviewed-by: Peter Maydell <peter.maydell@linaro.org>
Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
Any sysreg access results in an exception unless defined otherwise so
we should raise an exception by default.
Signed-off-by: Akihiko Odaki <akihiko.odaki@daynix.com>
Reviewed-by: Peter Maydell <peter.maydell@linaro.org>
Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
kvm_arch_init_vcpu() used to remove PMU when it is not available even
if the CPU model needs one. It is semantically incorrect, and may
continue execution on a misbehaving host that advertises a CPU model
while lacking its PMU. Keep the PMU when the CPU model needs one, and
let kvm_arm_vcpu_init() fail if the KVM implementation mismatches with
our expectation.
Signed-off-by: Akihiko Odaki <akihiko.odaki@daynix.com>
Reviewed-by: Peter Maydell <peter.maydell@linaro.org>
Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
target/arm/kvm.c checked PMU availability but unconditionally set the
PMU feature flag for the host CPU model, which is confusing. Set the
feature flag only when available.
Signed-off-by: Akihiko Odaki <akihiko.odaki@daynix.com>
Reviewed-by: Peter Maydell <peter.maydell@linaro.org>
Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
We include the files that define PR_MTE_TCF_SHIFT only on Linux, but use
them unconditionally. Restrict its use to Linux-only.
"It's ugly, but it's not actually wrong."
Signed-off-by: Warner Losh <imp@bsdimp.com>
Reviewed-by: Philippe Mathieu-Daudé <philmd@linaro.org>
Reviewed-by: Richard Henderson <richard.henderson@linaro.org>
Only support 4k pages for aarch64 binaries. The variable page size stuff
isn't working just yet, so put in this lessor-of-evils kludge until that
is complete.
Signed-off-by: Warner Losh <imp@bsdimp.com>
Reviewed-by: Richard Henderson <richard.henderson@linaro.org>
target/arm: Use set_helper_retaddr for dc_zva, sve and sme
target/ppc: Tidy dcbz helpers
target/ppc: Use set_helper_retaddr for dcbz
target/s390x: Use set_helper_retaddr in mem_helper.c
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Merge tag 'pull-tcg-20240723' of https://gitlab.com/rth7680/qemu into staging
accel/tcg: Export set/clear_helper_retaddr
target/arm: Use set_helper_retaddr for dc_zva, sve and sme
target/ppc: Tidy dcbz helpers
target/ppc: Use set_helper_retaddr for dcbz
target/s390x: Use set_helper_retaddr in mem_helper.c
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# gpg: Signature made Tue 23 Jul 2024 01:33:54 PM AEST
# gpg: using RSA key 7A481E78868B4DB6A85A05C064DF38E8AF7E215F
# gpg: issuer "richard.henderson@linaro.org"
# gpg: Good signature from "Richard Henderson <richard.henderson@linaro.org>" [ultimate]
* tag 'pull-tcg-20240723' of https://gitlab.com/rth7680/qemu:
target/riscv: Simplify probing in vext_ldff
target/s390x: Use set/clear_helper_retaddr in mem_helper.c
target/s390x: Use user_or_likely in access_memmove
target/s390x: Use user_or_likely in do_access_memset
target/ppc: Improve helper_dcbz for user-only
target/ppc: Merge helper_{dcbz,dcbzep}
target/ppc: Split out helper_dbczl for 970
target/ppc: Hoist dcbz_size out of dcbz_common
target/ppc/mem_helper.c: Remove a conditional from dcbz_common()
target/arm: Use set/clear_helper_retaddr in SVE and SME helpers
target/arm: Use set/clear_helper_retaddr in helper-a64.c
accel/tcg: Move {set,clear}_helper_retaddr to cpu_ldst.h
Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
Avoid a race condition with munmap in another thread.
Use around blocks that exclusively use "host_fn".
Keep the blocks as small as possible, but without setting
and clearing for every operation on one page.
Reviewed-by: Peter Maydell <peter.maydell@linaro.org>
Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
Use these in helper_dc_dva and the FEAT_MOPS routines to
avoid a race condition with munmap in another thread.
Reviewed-by: Peter Maydell <peter.maydell@linaro.org>
Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
Coverity reported a memory leak (CID 1549757) in this code and its
admittedly rather clumsy handling of extending the command table.
Instead of handing over a full array of the commands lets use the
lighter weight GPtrArray and simply test for the presence of each
entry as we go. This avoids complications of transferring ownership of
arrays and keeps the final command entries as static entries in the
target code.
Cc: Akihiko Odaki <akihiko.odaki@daynix.com>
Cc: Gustavo Bueno Romero <gustavo.romero@linaro.org>
Cc: Peter Maydell <peter.maydell@linaro.org>
Reviewed-by: Gustavo Romero <gustavo.romero@linaro.org>
Signed-off-by: Alex Bennée <alex.bennee@linaro.org>
Message-Id: <20240718094523.1198645-4-alex.bennee@linaro.org>
hvf did not advance PC when raising an exception for most unhandled
system registers, but it mistakenly advanced PC when raising an
exception for GICv3 registers.
Cc: qemu-stable@nongnu.org
Fixes: a2260983c6 ("hvf: arm: Add support for GICv3")
Signed-off-by: Akihiko Odaki <akihiko.odaki@daynix.com>
Message-id: 20240716-pmu-v3-4-8c7c1858a227@daynix.com
Reviewed-by: Peter Maydell <peter.maydell@linaro.org>
Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
This operation has float16 inputs and thus must use
the FZ16 control not the FZ control.
Cc: qemu-stable@nongnu.org
Fixes: 3916841ac7 ("target/arm: Implement FMOPA, FMOPS (widening)")
Reported-by: Daniyal Khan <danikhan632@gmail.com>
Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
Reviewed-by: Alex Bennée <alex.bennee@linaro.org>
Message-id: 20240717060149.204788-3-richard.henderson@linaro.org
Resolves: https://gitlab.com/qemu-project/qemu/-/issues/2374
Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
Reviewed-by: Alex Bennée <alex.bennee@linaro.org>
Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
We made a copy above because the fp exception flags
are not propagated back to the FPST register, but
then failed to use the copy.
Cc: qemu-stable@nongnu.org
Fixes: 558e956c71 ("target/arm: Implement FMOPA, FMOPS (non-widening)")
Signed-off-by: Daniyal Khan <danikhan632@gmail.com>
Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
Reviewed-by: Philippe Mathieu-Daudé <philmd@linaro.org>
Reviewed-by: Alex Bennée <alex.bennee@linaro.org>
Message-id: 20240717060149.204788-2-richard.henderson@linaro.org
[rth: Split from a larger patch]
Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
Reviewed-by: Philippe Mathieu-Daudé <philmd@linaro.org>
Reviewed-by: Alex Bennée <alex.bennee@linaro.org>
Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
In commit c1a1f80518 when we added the FEAT_LSE2 relaxations to
the alignment requirements for atomic and ordered loads and stores,
we didn't quite get it right for LDAPR/LDAPRH/LDAPRB with no
immediate offset. These instructions were handled in the old decoder
as part of disas_ldst_atomic(), but unlike all the other insns that
function decoded (LDADD, LDCLR, etc) these insns are "ordered", not
"atomic", so they should be using check_ordered_align() rather than
check_atomic_align(). Commit c1a1f80518 used
check_atomic_align() regardless for everything in
disas_ldst_atomic(). We then carried that incorrect check over in
the decodetree conversion, where LDAPR/LDAPRH/LDAPRB are now handled
by trans_LDAPR().
The effect is that when FEAT_LSE2 is implemented, these instructions
don't honour the SCTLR_ELx.nAA bit and will generate alignment
faults when they should not.
(The LDAPR insns with an immediate offset were in disas_ldst_ldapr_stlr()
and then in trans_LDAPR_i() and trans_STLR_i(), and have always used
the correct check_ordered_align().)
Use check_ordered_align() in trans_LDAPR().
Cc: qemu-stable@nongnu.org
Fixes: c1a1f80518 ("target/arm: Relax ordered/atomic alignment checks for LSE2")
Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
Reviewed-by: Richard Henderson <richard.henderson@linaro.org>
Message-id: 20240709134504.3500007-3-peter.maydell@linaro.org
When we converted the LDAPR/STLR instructions to decodetree we
accidentally introduced a regression where the offset is negative.
The 9-bit immediate field is signed, and the old hand decoder
correctly used sextract32() to get it out of the insn word,
but the ldapr_stlr_i pattern in the decode file used "imm:9"
instead of "imm:s9", so it treated the field as unsigned.
Fix the pattern to treat the field as a signed immediate.
Cc: qemu-stable@nongnu.org
Fixes: 2521b6073b ("target/arm: Convert LDAPR/STLR (imm) to decodetree")
Resolves: https://gitlab.com/qemu-project/qemu/-/issues/2419
Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
Reviewed-by: Philippe Mathieu-Daudé <philmd@linaro.org>
Reviewed-by: Richard Henderson <richard.henderson@linaro.org>
Message-id: 20240709134504.3500007-2-peter.maydell@linaro.org
Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
Reviewed-by: Philippe Mathieu-Daudé <philmd@linaro.org>
Reviewed-by: Peter Maydell <peter.maydell@linaro.org>
Message-id: 20240709000610.382391-7-richard.henderson@linaro.org
Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
Reviewed-by: Peter Maydell <peter.maydell@linaro.org>
Message-id: 20240709000610.382391-6-richard.henderson@linaro.org
Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
Reviewed-by: Peter Maydell <peter.maydell@linaro.org>
Message-id: 20240709000610.382391-5-richard.henderson@linaro.org
Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
Reviewed-by: Peter Maydell <peter.maydell@linaro.org>
Message-id: 20240709000610.382391-4-richard.henderson@linaro.org
Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
Reviewed-by: Peter Maydell <peter.maydell@linaro.org>
Message-id: 20240709000610.382391-3-richard.henderson@linaro.org
Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
Reviewed-by: Peter Maydell <peter.maydell@linaro.org>
Message-id: 20240709000610.382391-2-richard.henderson@linaro.org
Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
In commit a96edb687e we set the cpu_exec_halt field of the
TCGCPUOps arm_tcg_ops to arm_cpu_exec_halt(), but we left the
arm_v7m_tcg_ops struct unchanged. That isn't wrong, because for
M-profile FEAT_WFxT doesn't exist and the default handling for "no
cpu_exec_halt method" is correct, but it's perhaps a little
confusing. We would also like to make setting the cpu_exec_halt
method mandatory.
Initialize arm_v7m_tcg_ops cpu_exec_halt to the same function we use
for A-profile. (On M-profile we never set up the wfxt timer so there
is no change in behaviour here.)
Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
Reviewed-by: Philippe Mathieu-Daudé <philmd@linaro.org>
In a completely artifical memset benchmark object_dynamic_cast_assert
dominates the profile, even above guest address resolution and
the underlying host memset.
Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
Reviewed-by: Philippe Mathieu-Daudé <philmd@linaro.org>
Message-id: 20240702154911.1667418-1-richard.henderson@linaro.org
Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
In order to allow FPCR bits that aren't in the FPSCR (like the new
bits that are defined for FEAT_AFP), we need to make sure that writes
to the FPSCR only write to the bits of FPCR that are architecturally
mapped, and not the others.
Implement this with a new function vfp_set_fpcr_masked() which
takes a mask of which bits to update.
(We could do the same for FPSR, but we leave that until we actually
are likely to need it.)
Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
Reviewed-by: Richard Henderson <richard.henderson@linaro.org>
Message-id: 20240628142347.1283015-10-peter.maydell@linaro.org
Now that we store FPSR and FPCR separately, the FPSR_MASK and
FPCR_MASK macros are slightly confusingly named and the comment
describing them is out of date. Rename them to FPSCR_FPSR_MASK and
FPSCR_FPCR_MASK, document that they are the mask of which FPSCR bits
are architecturally mapped to which AArch64 register, and define them
symbolically rather than as hex values. (This latter requires
defining some extra macros for bits which we haven't previously
defined.)
Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
Reviewed-by: Richard Henderson <richard.henderson@linaro.org>
Message-id: 20240628142347.1283015-9-peter.maydell@linaro.org
The QC, N, Z, C, V bits live in the FPSR, not the FPCR. Rename the
macros that define these bits accordingly.
Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
Reviewed-by: Richard Henderson <richard.henderson@linaro.org>
Message-id: 20240628142347.1283015-8-peter.maydell@linaro.org
Now that we have refactored the set/get functions so that the FPSCR
format is no longer the authoritative one, we can keep FPSR and FPCR
in separate CPU state fields.
As well as the get and set functions, we also have a scattering of
places in the code which directly access vfp.xregs[ARM_VFP_FPSCR] to
extract single fields which are stored there. These all change to
directly access either vfp.fpsr or vfp.fpcr, depending on the
location of the field. (Most commonly, this is the NZCV flags.)
We make the field in the CPU state struct 64 bits, because
architecturally FPSR and FPCR are 64 bits. However we leave the
types of the arguments and return values of the get/set functions as
32 bits, since we don't need to make that change with the current
architecture and various callsites would be unable to handle
set bits in the high half (for instance the gdbstub protocol
assumes they're only 32 bit registers).
Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
Reviewed-by: Richard Henderson <richard.henderson@linaro.org>
Message-id: 20240628142347.1283015-7-peter.maydell@linaro.org
We already have a load_cpu_field_low32() to load the low half of a
64-bit CPU struct field to a TCGv_i32; however we haven't yet needed
the store equivalent. We'll want that in the next patch, so
implement it.
Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
Reviewed-by: Richard Henderson <richard.henderson@linaro.org>
Message-id: 20240628142347.1283015-6-peter.maydell@linaro.org
To support FPSR and FPCR bits that don't exist in the AArch32 FPSCR
view of floating point control and status (such as the FEAT_AFP ones),
we need to make sure those bits can be migrated. This commit allows
that, whilst maintaining backwards and forwards migration compatibility
for CPUs where there are no such bits:
On sending:
* If either the FPCR or the FPSR include set bits that are not
visible in the AArch32 FPSCR view of floating point control/status
then we send the FPCR and FPSR as two separate fields in a new
cpu/vfp/fpcr_fpsr subsection, and we send a 0 for the old
FPSCR field in cpu/vfp
* Otherwise, we don't send the fpcr_fpsr subsection, and we send
an FPSCR-format value in cpu/vfp as we did previously
On receiving:
* if we see a non-zero FPSCR field, that is the right information
* if we see a fpcr_fpsr subsection then that has the information
* if we see neither, then FPSCR/FPCR/FPSR are all zero on the source;
cpu_pre_load() ensures the CPU state defaults to that
* if we see both, then the migration source is buggy or malicious;
either the fpcr_fpsr or the FPSCR will "win" depending which
is first in the migration stream; we don't care which that is
We make the new FPCR and FPSR on-the-wire data be 64 bits, because
architecturally these registers are that wide, and this avoids the
need to engage in further migration-compatibility contortions in
future if some new architecture revision defines bits in the high
half of either register.
(We won't ever send the new migration subsection until we add support
for a CPU feature which enables setting overlapping FPCR bits, like
FEAT_AFP.)
Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
Reviewed-by: Richard Henderson <richard.henderson@linaro.org>
Message-id: 20240628142347.1283015-5-peter.maydell@linaro.org
Make vfp_set_fpscr() call vfp_set_fpsr() and vfp_set_fpcr()
instead of the other way around.
The masking we do when getting and setting vfp.xregs[ARM_VFP_FPSCR]
is a little awkward, but we are going to change where we store the
underlying FPSR and FPCR information in a later commit, so it will
go away then.
Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
Reviewed-by: Richard Henderson <richard.henderson@linaro.org>
Message-id: 20240628142347.1283015-4-peter.maydell@linaro.org
In AArch32, the floating point control and status bits are all in a
single register, FPSCR. In AArch64, these were split into separate
FPCR and FPSR registers, but the bit layouts remained the same, with
no overlaps, so that you could construct an FPSCR value by ORing FPCR
and FPSR, or equivalently could produce FPSR and FPCR by masking an
FPSCR value. For QEMU's implementation, we opted to use masking to
produce FPSR and FPCR, because we started with an AArch32
implementation of FPSCR.
The addition of the (AArch64-only) FEAT_AFP adds new bits to the FPCR
which overlap with some bits in the FPSR. This means we'll no longer
be able to consider the FPSCR-encoded value as the primary one, but
instead need to treat FPSR/FPCR as the primary encoding and construct
the FPSCR from those. (This remains possible because the FEAT_AFP
bits in FPCR don't appear in the FPSCR.)
As the first step in this refactoring, make vfp_get_fpscr() call
vfp_get_fpcr() and vfp_get_fpsr(), instead of the other way around.
Note that vfp_get_fpcsr_from_host() returns only bits in the FPSR
(for the cumulative fp exception bits), so we can simply rename
it without needing to add a new function for getting FPCR bits.
Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
Reviewed-by: Richard Henderson <richard.henderson@linaro.org>
Message-id: 20240628142347.1283015-3-peter.maydell@linaro.org
The M-profile FPSCR LTPSIZE is bits [18:16]; this is the same
field as A-profile FPSCR Len, not Stride. Correct the comment
in vfp_get_fpscr().
We also implemented M-profile FPSCR.QC, but forgot to delete
a TODO comment from vfp_set_fpscr(); remove it now.
Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
Reviewed-by: Richard Henderson <richard.henderson@linaro.org>
Message-id: 20240628142347.1283015-2-peter.maydell@linaro.org
This commit implements the stubs to handle the qIsAddressTagged,
qMemTag, and QMemTag GDB packets, allowing all GDB 'memory-tag'
subcommands to work with QEMU gdbstub on aarch64 user mode. It also
implements the get/set functions for the special GDB MTE register
'tag_ctl', used to control the MTE fault type at runtime.
Signed-off-by: Gustavo Romero <gustavo.romero@linaro.org>
Message-Id: <20240628050850.536447-11-gustavo.romero@linaro.org>
Signed-off-by: Alex Bennée <alex.bennee@linaro.org>
Message-Id: <20240705084047.857176-40-alex.bennee@linaro.org>
Make the MTE helpers allocation_tag_mem_probe, load_tag1, and store_tag1
available to other subsystems.
Signed-off-by: Gustavo Romero <gustavo.romero@linaro.org>
Reviewed-by: Richard Henderson <richard.henderson@linaro.org>
Reviewed-by: Philippe Mathieu-Daudé <philmd@linaro.org>
Message-Id: <20240628050850.536447-6-gustavo.romero@linaro.org>
Signed-off-by: Alex Bennée <alex.bennee@linaro.org>
Message-Id: <20240705084047.857176-35-alex.bennee@linaro.org>
If page in 'ptr_access' is inaccessible and probe is 'true'
allocation_tag_mem_probe should not throw an exception, but currently it
does, so fix it.
Signed-off-by: Gustavo Romero <gustavo.romero@linaro.org>
Reviewed-by: Alex Bennée <alex.bennee@linaro.org>
Reviewed-by: Richard Henderson <richard.henderson@linaro.org>
Message-Id: <20240628050850.536447-5-gustavo.romero@linaro.org>
Signed-off-by: Alex Bennée <alex.bennee@linaro.org>
Message-Id: <20240705084047.857176-34-alex.bennee@linaro.org>
Enable FEAT_Debugv8p8 for max CPU. This feature is out of scope for QEMU
since it concerns the external debug interface for JTAG, but is
mandatory in Armv8.8 implementations, hence it is reported as supported
in the ID registers.
Signed-off-by: Gustavo Romero <gustavo.romero@linaro.org>
Reviewed-by: Richard Henderson <richard.henderson@linaro.org>
Message-id: 20240624180915.4528-4-gustavo.romero@linaro.org
Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
Move the initialization of the debug ID registers to aa32_max_features,
which is used to set the 32-bit ID registers. This ensures that the
debug ID registers are consistently set for the max CPU in a single
place.
Signed-off-by: Gustavo Romero <gustavo.romero@linaro.org>
Reviewed-by: Richard Henderson <richard.henderson@linaro.org>
Message-id: 20240624180915.4528-3-gustavo.romero@linaro.org
Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
MLA, MLS, SQDMULH, SQRDMULH, were converted with 8db93dcd3d
and f80701cb44, and this code should have been removed then.
Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
Message-id: 20240625183536.1672454-14-richard.henderson@linaro.org
Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
Reviewed-by: Peter Maydell <peter.maydell@linaro.org>
Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
Message-id: 20240625183536.1672454-13-richard.henderson@linaro.org
Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
Reviewed-by: Peter Maydell <peter.maydell@linaro.org>
Reviewed-by: Peter Maydell <peter.maydell@linaro.org>
Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
Message-id: 20240625183536.1672454-12-richard.henderson@linaro.org
Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
Reviewed-by: Peter Maydell <peter.maydell@linaro.org>
Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
Message-id: 20240625183536.1672454-11-richard.henderson@linaro.org
Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
Reviewed-by: Peter Maydell <peter.maydell@linaro.org>
Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
Message-id: 20240625183536.1672454-10-richard.henderson@linaro.org
Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
Reviewed-by: Peter Maydell <peter.maydell@linaro.org>
Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
Message-id: 20240625183536.1672454-9-richard.henderson@linaro.org
Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
Reviewed-by: Peter Maydell <peter.maydell@linaro.org>
Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
Message-id: 20240625183536.1672454-8-richard.henderson@linaro.org
Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
Reviewed-by: Peter Maydell <peter.maydell@linaro.org>
Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
Message-id: 20240625183536.1672454-7-richard.henderson@linaro.org
Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
Reviewed-by: Peter Maydell <peter.maydell@linaro.org>
Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
Message-id: 20240625183536.1672454-6-richard.henderson@linaro.org
Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
Reviewed-by: Peter Maydell <peter.maydell@linaro.org>
Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
Message-id: 20240625183536.1672454-5-richard.henderson@linaro.org
Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
The inner loop, bounded by eltspersegment, must not be
larger than the outer loop, bounded by elements.
Cc: qemu-stable@nongnu.org
Reviewed-by: Peter Maydell <peter.maydell@linaro.org>
Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
Message-id: 20240625183536.1672454-3-richard.henderson@linaro.org
Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
This is an experiment to further reduce the amount we throw into the
exec headers. It might not be as useful as I initially thought because
just under half of the users also need gdbserver_start().
Reviewed-by: Pierrick Bouvier <pierrick.bouvier@linaro.org>
Signed-off-by: Alex Bennée <alex.bennee@linaro.org>
Reviewed-by: Richard Henderson <richard.henderson@linaro.org>
Message-Id: <20240620152220.2192768-3-alex.bennee@linaro.org>
sprintf() is deprecated on Darwin since macOS 13.0 / XCode 14.1,
resulting in painful developper experience. Use snprintf() instead.
Signed-off-by: Philippe Mathieu-Daudé <philmd@linaro.org>
Reviewed-by: Richard Henderson <richard.henderson@linaro.org>
Reviewed-by: Peter Maydell <peter.maydell@linaro.org>
Message-Id: <20240411104340.6617-9-philmd@linaro.org>
Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
FEAT_WFxT introduces new instructions WFIT and WFET, which are like
the existing WFI and WFE but allow the guest to pass a timeout value
in a register. The instructions will wait for an interrupt/event as
usual, but will also stop waiting when the value of CNTVCT_EL0 is
greater than or equal to the specified timeout value.
We implement WFIT by setting up a timer to expire at the right
point; when the timer expires it sets the EXITTB interrupt, which
will cause the CPU to leave the halted state. If we come out of
halt for some other reason, we unset the pending timer.
We implement WFET as a nop, which is architecturally permitted and
matches the way we currently make WFE a nop.
Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
Reviewed-by: Richard Henderson <richard.henderson@linaro.org>
Message-id: 20240430140035.3889879-3-peter.maydell@linaro.org
Reviewed-by: Peter Maydell <peter.maydell@linaro.org>
Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
Message-id: 20240528203044.612851-34-richard.henderson@linaro.org
Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
These are the only instructions in the 3 source scalar class.
Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
Reviewed-by: Peter Maydell <peter.maydell@linaro.org>
Message-id: 20240528203044.612851-33-richard.henderson@linaro.org
Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
These are the last instructions within disas_simd_three_reg_same
and disas_simd_scalar_three_reg_same, so remove them.
Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
Reviewed-by: Peter Maydell <peter.maydell@linaro.org>
Message-id: 20240528203044.612851-32-richard.henderson@linaro.org
Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
We already have a gvec helper for the operations, but we aren't
using it on the aa32 neon side. Create a unified expander for
use by both aa32 and aa64 translators.
Reviewed-by: Peter Maydell <peter.maydell@linaro.org>
Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
Message-id: 20240528203044.612851-31-richard.henderson@linaro.org
Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
Reviewed-by: Peter Maydell <peter.maydell@linaro.org>
Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
Message-id: 20240528203044.612851-30-richard.henderson@linaro.org
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Reviewed-by: Peter Maydell <peter.maydell@linaro.org>
Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
Message-id: 20240528203044.612851-29-richard.henderson@linaro.org
Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
Reviewed-by: Peter Maydell <peter.maydell@linaro.org>
Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
Message-id: 20240528203044.612851-28-richard.henderson@linaro.org
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Reviewed-by: Peter Maydell <peter.maydell@linaro.org>
Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
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Reviewed-by: Peter Maydell <peter.maydell@linaro.org>
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Reviewed-by: Peter Maydell <peter.maydell@linaro.org>
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Reviewed-by: Peter Maydell <peter.maydell@linaro.org>
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Reviewed-by: Peter Maydell <peter.maydell@linaro.org>
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Reviewed-by: Peter Maydell <peter.maydell@linaro.org>
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Reviewed-by: Peter Maydell <peter.maydell@linaro.org>
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Reviewed-by: Peter Maydell <peter.maydell@linaro.org>
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Reviewed-by: Peter Maydell <peter.maydell@linaro.org>
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Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
Reviewed-by: Peter Maydell <peter.maydell@linaro.org>
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Message-id: 20240528203044.612851-12-richard.henderson@linaro.org
Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
