As part of ARMv8M, we need to add support for the PMSAv8 MPU
architecture.
PMSAv8 differs from PMSAv7 both in register/data layout (for instance
using base and limit registers rather than base and size) and also in
behaviour (for example it does not have subregions); rather than
trying to wedge it into the existing PMSAv7 code and data structures,
we define separate ones.
This commit adds the data structures which hold the state for a
PMSAv8 MPU and the register interface to it. The implementation of
the MPU behaviour will be added in a subsequent commit.
Backports commit 0e1a46bbd2d6c39614b87f4e88ea305acce8a35f from qemu
ARM is a fixed-length ISA and we can compute the page crossing
condition exactly once during init_disas_context.
Backports commit d0264d86b026e9d948de577b05ff86d708658576 from qemu
We need not check for ARM vs Thumb state in order to dispatch
disassembly of every instruction.
Backports commit 722ef0a562a8cd810297b00516e36380e2f33353 from qemu
Since AArch64 uses a fixed-width ISA, we can pre-compute the number of
insns remaining on the page. Also, we can check for single-step once.
Backports commit dcc3a21209a8eeae0fe43966012f8e08d3566f98 from qemu
Incrementally paves the way towards using the generic instruction translation
loop.
Backports commit 58350fa4b2852fede96cfebad0b26bf79bca419c from qemu
Incrementally paves the way towards using the generic instruction translation
loop.
Backports commit 4013f7fc811e90b89da3a516dc71b01ca0e7e54e from qemu
Incrementally paves the way towards using the generic instruction translation
loop.
Backports commit be4079641f1bc755fc5d3ff194cf505c506227d8 from qemu
Incrementally paves the way towards using the generic instruction translation
loop.
Backports commit 70d3c035ae36a2c5c0f991ba958526127c92bb67 from qemu
Incrementally paves the way towards using the generic instruction translation
loop.
Backports commit 24299c892cbfe29120f051b6b7d0bcf3e0cc8e85 from qemu
Incrementally paves the way towards using the generic instruction translation
loop.
Backports commit 13189a9080b35b13af23f2be4806fa0cdbb31af3 from qemu
Incrementally paves the way towards using the generic instruction translation
loop.
Backports commit 0cb56b373da70047979b61b042f59aaff4012e1b from qemu
Incrementally paves the way towards using the generic instruction translation
loop.
Backports commit a68956ad7f8510bdc0b54793c65c62c6a94570a4 from qemu
Incrementally paves the way towards using the generic instruction translation
loop.
Backports commit f62bd897e64c6fb1f93e8795e835980516fe53b5 from qemu
Incrementally paves the way towards using the generic instruction translation
loop.
Backports commit b14768544fd715a3f1742c10fc36ae81c703cbc1 from qemu
Incrementally paves the way towards using the generic instruction translation
loop.
Backports commit 5c03990665aa9095e4d2734c8ca0f936a8e8f000 from qemu
Incrementally paves the way towards using the generic instruction translation
loop.
Backports commit 1d8a5535238fc5976e0542a413f4ad88f5d4b233 from qemu
Incrementally paves the way towards using the generic
instruction translation loop.
Backports commit dcba3a8d443842f7a30a2c52d50a6b50b6982b35 from qemu
Incrementally paves the way towards using the generic instruction translation
loop.
Backports commit e0d110d943891b719de7ca075fc17fa8ea5749b8 from qemu
Incrementally paves the way towards using the generic instruction translation
loop.
Backports commit 47e981b42553f00110024c33897354f9014e83e9 from qemu
Incrementally paves the way towards using the generic instruction translation
loop.
Backports commit 2c2f8cacd8cf4f67d6f1384b19d38f9a0a25878b from qemu
Incrementally paves the way towards using the generic instruction translation
loop.
Backports commit e6b41ec37f0a9742374dfdb90e662745969cd7ea from qemu
Incrementally paves the way towards using the generic instruction translation
loop.
Backports commit e6b41ec37f0a9742374dfdb90e662745969cd7ea from qemu
Incrementally paves the way towards using the generic instruction translation
loop.
Backports commit 9d75f52b34053066b8e8fc37610d5f300d67538b from qemu
Incrementally paves the way towards using the generic instruction translation
loop.
Backports commit 9761d39b09c4beb1340bf3074be3d3e0a5d453a4 from qemu
Incrementally paves the way towards using the generic instruction translation
loop.
Backports commit 6cf147aa299e49f7794858609a1e8ef19f81c007 from qemu
There's nothing magic about the exception that we generate in order
to execute the magic kernel page. We can and should allow gdb to
set a breakpoint at this location.
Backports commit 3805c2eba8999049bbbea29fdcdea4d47d943c88 from qemu
Used later. An enum makes expected values explicit and
bounds the value space of switches.
Backports commit 77fc6f5e28667634916f114ae04c6029cd7b9c45 from qemu
Fold DISAS_EXC and DISAS_TB_JUMP into DISAS_NORETURN.
In both cases all following code is dead. In the first
case because we have exited the TB via exception; in the
second case because we have exited the TB via goto_tb
and its associated machinery.
Backports commit a0c231e651b249960906f250b8e5eef5ed9888c4 from qemu
This target is not sophisticated in its use of cleanups at the
end of the translation loop. For the most part, any condition
that exits the TB is dealt with by emitting the exiting opcode
right then and there. Therefore the only is_jmp indicator that
is needed is DISAS_NORETURN.
For two stack segment modifying cases, we have not yet exited
the TB (therefore DISAS_NORETURN feels wrong), but intend to exit.
The caller of gen_movl_seg_T0 currently checks for any non-zero
value, therefore DISAS_TOO_MANY seems acceptable for that usage.
Backports commit 1e39d97af086d525cd0408eaa5d19783ea165906 from qemu
This will allow some amount of cleanup to happen before
switching the backends over to enum DisasJumpType.
Backports commit 5dc66895b0113034cd37fd5e65911d7959fc26a9 from qemu
This allows LOAD HALFWORD IMMEDIATE ON CONDITION,
eliminating one insn in some common cases.
Backports commit 7af525af01b9615c4f4df5da2e8a50f2fe00b023 from qemu
Currently, we cannot use mttcg for running strong memory model guests
on weak memory model hosts due to missing ordering semantics.
We implicitly generate fence instructions for stronger guests if an
ordering mismatch is detected. We generate fences only for the orders
for which fence instructions are necessary, for example a fence is not
necessary between a store and a subsequent load on x86 since its
absence in the guest binary tells that ordering need not be
ensured. Also note that if we find multiple subsequent fence
instructions in the generated IR, we combine them in the TCG
optimization pass.
This patch allows us to boot an x86 guest on ARM64 hosts using mttcg.
Backports commit b32dc3370a666e237b2099c22166b15e58cb6df8 from qemu
For external aborts, we will want to be able to specify the EA
(external abort type) bit in the syndrome field. Allow callers of
deliver_fault() to do that by adding a field to ARMMMUFaultInfo which
we use when constructing the syndrome values.
Backports commit c528af7aa64f159eb30b46e567b650c5440fc117 from qemu
We currently have some similar code in tlb_fill() and in
arm_cpu_do_unaligned_access() for delivering a data abort or prefetch
abort. We're also going to want to do the same thing to handle
external aborts. Factor out the common code into a new function
deliver_fault().
Backports commit aac43da1d772a50778ab1252c13c08c2eb31fb39 from qemu
Call the new cpu_transaction_failed() hook at the places where
CPU generated code interacts with the memory system:
io_readx()
io_writex()
get_page_addr_code()
Any access from C code (eg via cpu_physical_memory_rw(),
address_space_rw(), ld/st_*_phys()) will *not* trigger CPU exceptions
via cpu_transaction_failed(). Handling for transactions failures for
this kind of call should be done by using a function which returns a
MemTxResult and treating the failure case appropriately in the
calling code.
In an ideal world we would not generate CPU exceptions for
instruction fetch failures in get_page_addr_code() but instead wait
until the code translation process tried a load and it failed;
however that change would require too great a restructuring and
redesign to attempt at this point.
Backports commit 04e3aabde397e7abc78ba1ce6cbd144d5fbb1722 from qemu
