motorhead/qemu
1
0
Fork 0
mirror of https://github.com/Motorhead1991/qemu.git synced 2025-08-08 02:03:56 -06:00
Code Issues Projects Releases Packages Wiki Activity Actions

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

Browse source 
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
This commit is contained in:
Peter Maydell 2023-09-12 15:04:28 +01:00
parent aa03378bcc
commit 8163998920
2 changed files with 80 additions and 2 deletions
Download patch file Download diff file Expand all files Collapse all files

28
target/arm/internals.h
View file

@ -1272,6 +1272,34 @@ FIELD(MTEDESC, SIZEM1, 12, SIMD_DATA_BITS - 12) /* size - 1 */
bool mte_probe(CPUARMState *env, uint32_t desc, uint64_t ptr);
uint64_t mte_check(CPUARMState *env, uint32_t desc, uint64_t ptr, uintptr_t ra);
/**
* mte_mops_probe: Check where the next MTE failure is for a FEAT_MOPS operation
* @env: CPU env
* @ptr: start 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(CPUARMState *env, uint64_t ptr, uint64_t size,
uint32_t desc);
/**
* mte_check_fail: Record an MTE tag check failure
* @env: CPU env
* @desc: MTEDESC descriptor word
* @dirty_ptr: Failing dirty address
* @ra: TCG retaddr
*
* This may never return (if the MTE tag checks are configured to fault).
*/
void mte_check_fail(CPUARMState *env, uint32_t desc,
uint64_t dirty_ptr, uintptr_t ra);
static inline int allocation_tag_from_addr(uint64_t ptr)
{
return extract64(ptr, 56, 4);