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target-arm: raise exception on misaligned LDREX operands

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Qemu does not generally perform alignment checks. However, the ARM ARM
requires implementation of alignment exceptions for a number of cases
including LDREX, and Windows-on-ARM relies on this.

This change adds plumbing to enable alignment checks on loads using
MO_ALIGN, a do_unaligned_access hook to raise the exception (data
abort), and uses the new aligned loads in LDREX (for all but
single-byte loads).

Signed-off-by: Andrew Baumann <Andrew.Baumann@microsoft.com>
Message-id: 1449167808-5656-1-git-send-email-Andrew.Baumann@microsoft.com
[PMM: set WnR bits in syndrome and FSR as appropriate]
Reviewed-by: Peter Maydell <peter.maydell@linaro.org>
Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
This commit is contained in:
Andrew Baumann 2015-12-17 13:37:13 +00:00 • committed by Peter Maydell
parent 580106df5f
commit 30901475b9
5 changed files with 62 additions and 5 deletions
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7
target-arm/internals.h
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@ -441,4 +441,11 @@ struct ARMMMUFaultInfo {
bool arm_tlb_fill(CPUState *cpu, vaddr address, int rw, int mmu_idx,
uint32_t *fsr, ARMMMUFaultInfo *fi);
/* Return true if the translation regime is using LPAE format page tables */
bool arm_regime_using_lpae_format(CPUARMState *env, ARMMMUIdx mmu_idx);
/* Raise a data fault alignment exception for the specified virtual address */
void arm_cpu_do_unaligned_access(CPUState *cs, vaddr vaddr, int is_write,
int is_user, uintptr_t retaddr);
#endif