v7-M IPC #444
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v7-M IPC #444
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Patater
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To avoid undefined behavior, replace the signed "times" counter with an unsigned one. We don't need to track negative times anyway. ./core/vmpu/src/mpu_armv8m/vmpu_armv8m_unpriv_access.c: In function 'vmpu_unpriv_access': ./core/vmpu/src/mpu_armv8m/vmpu_armv8m_unpriv_access.c:126:1: error: assuming signed overflow does not occur when changing X +- C1 cmp C2 to X cmp C2 -+ C1 [-Werror=strict-overflow] } ^ ./core/vmpu/src/mpu_armv8m/vmpu_armv8m_unpriv_access.c:94:10: error: assuming signed overflow does not occur when changing X +- C1 cmp C2 to X cmp C2 -+ C1 [-Werror=strict-overflow] uint32_t vmpu_unpriv_access(uint32_t addr, uint32_t size, uint32_t data)
To ensure our sanity checks stay sane, it's good to make sure we aren't invoking undefined overflow behavior. Make the compiler warn us when it attempts to take advantage of undefined overflow in optimizing.
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niklarm
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Jul 6, 2017
Fixes 10d456b ("Implement buffer_access_is_ok for v7 and Kinetis MPU")
Previously, we didn't deliver IPC messages on ARMv7-M platforms, as we weren't draining the IPC queue on thread switch. Drain the queue.
This enables uvisor and uvisor-tests to stay synchronized.
niklarm
approved these changes
Jul 13, 2017
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This depends on https://github.com/ARMmbed/uvisor-tests/pull/129 being merged first.
@niklas-arm