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target/arm: Implement the SETG* instructions

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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
This commit is contained in:
Peter Maydell 2023-09-12 15:04:31 +01:00
parent 179e9a3bac
commit 6087df5744
6 changed files with 155 additions and 9 deletions
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40
target/arm/tcg/mte_helper.c
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@ -1041,3 +1041,43 @@ uint64_t mte_mops_probe(CPUARMState *env, uint64_t ptr, uint64_t size,
return n * TAG_GRANULE - (ptr - tag_first);
}
}
void mte_mops_set_tags(CPUARMState *env, uint64_t ptr, uint64_t size,
uint32_t desc)
{
int mmu_idx, tag_count;
uint64_t ptr_tag;
void *mem;
if (!desc) {
/* Tags not actually enabled */
return;
}
mmu_idx = FIELD_EX32(desc, MTEDESC, MIDX);
/* True probe: this will never fault */
mem = allocation_tag_mem_probe(env, mmu_idx, ptr, MMU_DATA_STORE, size,
MMU_DATA_STORE, true, 0);
if (!mem) {
return;
}
/*
* We know that ptr and size are both TAG_GRANULE aligned; store
* the tag from the pointer value into the tag memory.
*/
ptr_tag = allocation_tag_from_addr(ptr);
tag_count = size / TAG_GRANULE;
if (ptr & TAG_GRANULE) {
/* Not 2*TAG_GRANULE-aligned: store tag to first nibble */
store_tag1_parallel(TAG_GRANULE, mem, ptr_tag);
mem++;
tag_count--;
}
memset(mem, ptr_tag | (ptr_tag << 4), tag_count / 2);
if (tag_count & 1) {
/* Final trailing unaligned nibble */
mem += tag_count / 2;
store_tag1_parallel(0, mem, ptr_tag);
}
}