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[Qemu-devel] [PATCH 07/20] target/arm: Warn about restoring to unaligned
From: |
Peter Maydell |
Subject: |
[Qemu-devel] [PATCH 07/20] target/arm: Warn about restoring to unaligned stack |
Date: |
Fri, 22 Sep 2017 15:59:54 +0100 |
Attempting to do an exception return with an exception frame that
is not 8-aligned is UNPREDICTABLE in v8M; warn about this.
(It is not UNPREDICTABLE in v7M, and our implementation can
handle the merely-4-aligned case fine, so we don't need to
do anything except warn.)
Signed-off-by: Peter Maydell <address@hidden>
---
target/arm/helper.c | 7 +++++++
1 file changed, 7 insertions(+)
diff --git a/target/arm/helper.c b/target/arm/helper.c
index a2e46fb..979129e 100644
--- a/target/arm/helper.c
+++ b/target/arm/helper.c
@@ -6403,6 +6403,13 @@ static void do_v7m_exception_exit(ARMCPU *cpu)
return_to_sp_process);
uint32_t frameptr = *frame_sp_p;
+ if (!QEMU_IS_ALIGNED(frameptr, 8) &&
+ arm_feature(env, ARM_FEATURE_V8)) {
+ qemu_log_mask(LOG_GUEST_ERROR,
+ "M profile exception return with non-8-aligned SP "
+ "for destination state is UNPREDICTABLE\n");
+ }
+
/* Pop registers. TODO: make these accesses use the correct
* attributes and address space (S/NS, priv/unpriv) and handle
* memory transaction failures.
--
2.7.4
- Re: [Qemu-devel] [PATCH 01/20] nvic: Clear the vector arrays and prigroup on reset, (continued)
- [Qemu-devel] [PATCH 06/20] target/arm: Check for xPSR mismatch usage faults earlier for v8M, Peter Maydell, 2017/09/22
- [Qemu-devel] [PATCH 04/20] target/arm: Restore security state on exception return, Peter Maydell, 2017/09/22
- [Qemu-devel] [PATCH 05/20] target/arm: Restore SPSEL to correct CONTROL register on exception return, Peter Maydell, 2017/09/22
- [Qemu-devel] [PATCH 08/20] target/arm: Don't warn about exception return with PC low bit set for v8M, Peter Maydell, 2017/09/22
- [Qemu-devel] [PATCH 10/20] target/arm: Update excret sanity checks for v8M, Peter Maydell, 2017/09/22
- [Qemu-devel] [PATCH 02/20] target/arm: Don't switch to target stack early in v7M exception return, Peter Maydell, 2017/09/22
- [Qemu-devel] [PATCH 03/20] target/arm: Prepare for CONTROL.SPSEL being nonzero in Handler mode, Peter Maydell, 2017/09/22
- [Qemu-devel] [PATCH 07/20] target/arm: Warn about restoring to unaligned stack,
Peter Maydell <=
- [Qemu-devel] [PATCH 09/20] target/arm: Add new-in-v8M SFSR and SFAR, Peter Maydell, 2017/09/22
- [Qemu-devel] [PATCH 13/20] nvic: Implement Security Attribution Unit registers, Peter Maydell, 2017/09/22
- [Qemu-devel] [PATCH 18/20] target/arm: Implement BLXNS, Peter Maydell, 2017/09/22
- [Qemu-devel] [PATCH 16/20] target/arm: Factor out "get mmuidx for specified security state", Peter Maydell, 2017/09/22
- [Qemu-devel] [PATCH 11/20] target/arm: Add support for restoring v8M additional state context, Peter Maydell, 2017/09/22
- [Qemu-devel] [PATCH 12/20] target/arm: Add v8M support to exception entry code, Peter Maydell, 2017/09/22
- [Qemu-devel] [PATCH 17/20] target/arm: Implement SG instruction, Peter Maydell, 2017/09/22
- [Qemu-devel] [PATCH 14/20] target/arm: Implement security attribute lookups for memory accesses, Peter Maydell, 2017/09/22