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target/arm: Implement MTE tag-checking functions for FEAT_MOPS copies

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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
This commit is contained in:
Peter Maydell 2023-09-12 15:04:32 +01:00
parent 6087df5744
commit 69c51dc372
2 changed files with 116 additions and 0 deletions
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17
target/arm/internals.h
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@ -1288,6 +1288,23 @@ uint64_t mte_check(CPUARMState *env, uint32_t desc, uint64_t ptr, uintptr_t ra);
uint64_t mte_mops_probe(CPUARMState *env, uint64_t ptr, uint64_t size,
uint32_t desc);
/**
* mte_mops_probe_rev: Check where the next MTE failure is for a FEAT_MOPS
* operation going in the reverse direction
* @env: CPU env
* @ptr: *end* address of memory region (dirty pointer)
* @size: length of region (guaranteed not to cross a page boundary)
* @desc: MTEDESC descriptor word (0 means no MTE checks)
* Returns: the size of the region that can be copied without hitting
* an MTE tag failure
*
* Note that we assume that the caller has already checked the TBI
* and TCMA bits with mte_checks_needed() and an MTE check is definitely
* required.
*/
uint64_t mte_mops_probe_rev(CPUARMState *env, uint64_t ptr, uint64_t size,
uint32_t desc);
/**
* mte_check_fail: Record an MTE tag check failure
* @env: CPU env