When we are doing a FEAT_MOPS copy that must be performed backwards,
we call mte_mops_probe_rev(), passing it the address of the last byte
in the region we are probing. However, allocation_tag_mem_probe()
wants the address of the first byte to get the tag memory for.
Because we passed it (ptr, size) we could incorrectly trip the
allocation_tag_mem_probe() check for "does this access run across to
the following page", and if that following page happened not to be
valid then we would assert.
We know we will always be only dealing with a single page because the
code that calls mte_mops_probe_rev() ensures that. We could make
mte_mops_probe_rev() pass 'ptr - (size - 1)' to
allocation_tag_mem_probe(), but then we would have to adjust the
returned 'mem' pointer to get back to the tag RAM for the last byte
of the region. It's simpler to just pass in a size of 1 byte,
because we know that allocation_tag_mem_probe() in pure-probe
single-page mode doesn't care about the size.
Fixes: 69c51dc372 ("target/arm: Implement MTE tag-checking functions for FEAT_MOPS copies")
Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
Reviewed-by: Philippe Mathieu-Daudé <philmd@linaro.org>
Acked-by: Richard Henderson <richard.henderson@linaro.org>
Message-id: 20231110162546.2192512-1-peter.maydell@linaro.org
TARGET_PAGE_ENTRY_EXTRA is a macro that allows guests to specify additional
fields for caching with the full TLB entry. This macro is replaced with
a union in CPUTLBEntryFull, thus making CPUTLB target-agnostic at the
cost of slightly inflated CPUTLBEntryFull for non-arm guests.
Note, this is needed to ensure that fields in CPUTLB don't vary in
offset between various targets.
(arm is the only guest actually making use of this feature.)
Signed-off-by: Anton Johansson <anjo@rev.ng>
Message-Id: <20230912153428.17816-2-anjo@rev.ng>
Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
The FEAT_MOPS memory copy operations need an extra helper routine
for checking for MTE tag checking failures beyond the ones we
already added for memory set operations:
* mte_mops_probe_rev() does the same job as mte_mops_probe(), but
it checks tags starting at the provided address and working
backwards, rather than forwards
Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
Reviewed-by: Richard Henderson <richard.henderson@linaro.org>
Message-id: 20230912140434.1333369-11-peter.maydell@linaro.org
The FEAT_MOPS SETG* instructions are very similar to the SET*
instructions, but as well as setting memory contents they also
set the MTE tags. They are architecturally required to operate
on tag-granule aligned regions only.
Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
Reviewed-by: Richard Henderson <richard.henderson@linaro.org>
Message-id: 20230912140434.1333369-10-peter.maydell@linaro.org
The FEAT_MOPS instructions need a couple of helper routines that
check for MTE tag failures:
* mte_mops_probe() checks whether there is going to be a tag
error in the next up-to-a-page worth of data
* mte_check_fail() is an existing function to record the fact
of a tag failure, which we need to make global so we can
call it from helper-a64.c
Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
Reviewed-by: Richard Henderson <richard.henderson@linaro.org>
Message-id: 20230912140434.1333369-7-peter.maydell@linaro.org
For the FEAT_MOPS operations, the existing allocation_tag_mem()
function almost does what we want, but it will take a watchpoint
exception even for an ra == 0 probe request, and it requires that the
caller guarantee that the memory is accessible. For FEAT_MOPS we
want a function that will not take any kind of exception, and will
return NULL for the not-accessible case.
Rename allocation_tag_mem() to allocation_tag_mem_probe() and add an
extra 'probe' argument that lets us distinguish these cases;
allocation_tag_mem() is now a wrapper that always passes 'false'.
Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
Reviewed-by: Richard Henderson <richard.henderson@linaro.org>
Message-id: 20230912140434.1333369-6-peter.maydell@linaro.org
The allocation_tag_mem() function takes an argument tag_size,
but it never uses it. Remove the argument. In mte_probe_int()
in particular this also lets us delete the code computing
the value we were passing in.
Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
Reviewed-by: Richard Henderson <richard.henderson@linaro.org>
Reviewed-by: Philippe Mathieu-Daudé <philmd@linaro.org>
Support all of the easy GM block sizes.
Use direct memory operations, since the pointers are aligned.
While BS=2 (16 bytes, 1 tag) is a legal setting, that requires
an atomic store of one nibble. This is not difficult, but there
is also no point in supporting it until required.
Note that cortex-a710 sets GM blocksize to match its cacheline
size of 64 bytes. I expect many implementations will also
match the cacheline, which makes 16 bytes very unlikely.
Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
Reviewed-by: Peter Maydell <peter.maydell@linaro.org>
Message-id: 20230811214031.171020-4-richard.henderson@linaro.org
Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
Previously we hard-coded the blocksize with GMID_EL1_BS.
But the value we choose for -cpu max does not match the
value that cortex-a710 uses.
Mirror the way we handle dcz_blocksize.
Reviewed-by: Peter Maydell <peter.maydell@linaro.org>
Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
Message-id: 20230811214031.171020-3-richard.henderson@linaro.org
Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
Fixes a bug in that with SCTLR.A set, we should raise any
alignment fault before raising any MTE check fault.
Reviewed-by: Peter Maydell <peter.maydell@linaro.org>
Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
Message-id: 20230530191438.411344-15-richard.henderson@linaro.org
Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
Both cpu_check_watchpoint() and cpu_watchpoint_address_matches()
are specific to TCG system emulation. Declare them in "tcg-cpu-ops.h"
to be sure accessing them from non-TCG code is a compilation error.
Signed-off-by: Philippe Mathieu-Daudé <philmd@linaro.org>
Message-Id: <20230328173117.15226-2-philmd@linaro.org>
Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
Change to match the recent change to probe_access_flags.
All existing callers updated to supply 0, so no change in behaviour.
Reviewed-by: Philippe Mathieu-Daudé <philmd@linaro.org>
Reviewed-by: Daniel Henrique Barboza <dbarboza@ventanamicro.com>
Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
