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| author | Peter Maydell <peter.maydell@linaro.org> | 2016-02-23 15:36:43 +0000 |
|---|---|---|
| committer | Peter Maydell <peter.maydell@linaro.org> | 2016-02-26 15:09:41 +0000 |
| commit | cb01d3912c8b000ed26d5fe95f6c194b3e3ba7a6 (patch) | |
| tree | 1482249d7b141245cf2048e98770414ad37b43da /target-arm/helper.c | |
| parent | ae08792301c182bdec48656dee3dce38b3391a1a (diff) | |
| download | qemu-cb01d3912c8b000ed26d5fe95f6c194b3e3ba7a6.tar.gz qemu-cb01d3912c8b000ed26d5fe95f6c194b3e3ba7a6.tar.bz2 qemu-cb01d3912c8b000ed26d5fe95f6c194b3e3ba7a6.zip | |
target-arm: In cpsr_write() ignore mode switches from User mode
The only case where we can attempt a cpsr_write() mode switch from
User is from the gdbstub; all other cases are handled in the
calling code (notably translate.c). Architecturally attempts to
alter the mode bits from user mode are simply ignored (and not
treated as a bad mode switch, which in v8 sets CPSR.IL). Make
mode switches from User ignored in cpsr_write() as well, for
consistency.
Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
Reviewed-by: Sergey Fedorov <serge.fdrv@gmail.com>
Message-id: 1455556977-3644-6-git-send-email-peter.maydell@linaro.org
Diffstat (limited to 'target-arm/helper.c')
| -rw-r--r-- | target-arm/helper.c | 1 |
1 files changed, 1 insertions, 0 deletions
diff --git a/target-arm/helper.c b/target-arm/helper.c index c491cd80ab..b2d2440edd 100644 --- a/target-arm/helper.c +++ b/target-arm/helper.c @@ -5316,6 +5316,7 @@ void cpsr_write(CPUARMState *env, uint32_t val, uint32_t mask, env->daif |= val & CPSR_AIF & mask; if (write_type != CPSRWriteRaw && + (env->uncached_cpsr & CPSR_M) != CPSR_USER && ((env->uncached_cpsr ^ val) & mask & CPSR_M)) { if (bad_mode_switch(env, val & CPSR_M)) { /* Attempt to switch to an invalid mode: this is UNPREDICTABLE. |