diff options
| author | Peter Maydell <peter.maydell@linaro.org> | 2017-07-27 11:59:06 +0100 |
|---|---|---|
| committer | Peter Maydell <peter.maydell@linaro.org> | 2017-07-31 13:05:21 +0100 |
| commit | 38aaa60ca464b48e6feef346709e97335d01b289 (patch) | |
| tree | 4d7a169ff9fa48a6c7ff25de3cbe5ee2f5cb2db2 /target/arm | |
| parent | 709e4407add7acacc593cb6cdac026558c9a8fb6 (diff) | |
target/arm: Don't do MPU lookups for addresses in M profile PPB region
The M profile PMSAv7 specification says that if the address being looked
up is in the PPB region (0xe0000000 - 0xe00fffff) then we do not use
the MPU regions but always use the default memory map. Implement this
(we were previously behaving like an R profile PMSAv7, which does not
special case this).
Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
Reviewed-by: Philippe Mathieu-Daudé <f4bug@amsat.org>
Message-id: 1501153150-19984-2-git-send-email-peter.maydell@linaro.org
Diffstat (limited to 'target/arm')
| -rw-r--r-- | target/arm/helper.c | 17 |
1 files changed, 16 insertions, 1 deletions
diff --git a/target/arm/helper.c b/target/arm/helper.c index 9ed5096098..3d6057503d 100644 --- a/target/arm/helper.c +++ b/target/arm/helper.c @@ -8244,6 +8244,13 @@ static bool pmsav7_use_background_region(ARMCPU *cpu, } } +static inline bool m_is_ppb_region(CPUARMState *env, uint32_t address) +{ + /* True if address is in the M profile PPB region 0xe0000000 - 0xe00fffff */ + return arm_feature(env, ARM_FEATURE_M) && + extract32(address, 20, 12) == 0xe00; +} + static bool get_phys_addr_pmsav7(CPUARMState *env, uint32_t address, int access_type, ARMMMUIdx mmu_idx, hwaddr *phys_ptr, int *prot, uint32_t *fsr) @@ -8255,7 +8262,15 @@ static bool get_phys_addr_pmsav7(CPUARMState *env, uint32_t address, *phys_ptr = address; *prot = 0; - if (regime_translation_disabled(env, mmu_idx)) { /* MPU disabled */ + if (regime_translation_disabled(env, mmu_idx) || + m_is_ppb_region(env, address)) { + /* MPU disabled or M profile PPB access: use default memory map. + * The other case which uses the default memory map in the + * v7M ARM ARM pseudocode is exception vector reads from the vector + * table. In QEMU those accesses are done in arm_v7m_load_vector(), + * which always does a direct read using address_space_ldl(), rather + * than going via this function, so we don't need to check that here. + */ get_phys_addr_pmsav7_default(env, mmu_idx, address, prot); } else { /* MPU enabled */ for (n = (int)cpu->pmsav7_dregion - 1; n >= 0; n--) { |