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-id = 1421
-title = "GDB memory reads fail on Cortex-M33"
-state = "closed"
-created_at = "2023-01-07T00:12:28.630Z"
-closed_at = "2023-03-07T12:41:14.403Z"
-labels = ["Closed::Fixed", "GDB", "target: arm"]
-url = "https://gitlab.com/qemu-project/qemu/-/issues/1421"
-host-os = "Fedora 36"
-host-arch = "x86_64 host, Arm cortex-m33 emulated"
-qemu-version = "QEMU emulator version 7.2.50 (v7.2.0-334-gca5181d8d7-dirty)  (This is based on upstream git revision 222059a0fccf4af3be776fe35a5ea2d6a68f9a0b with some irrelevant local changes)."
-guest-os = "Bare metal"
-guest-arch = "Arm Cortex M-33"
-description = """GDB fails to read memory from the guest.  There appear to be at least two problems:
-
-1. In `arm_cpu_get_phys_page_attrs_debug`, `arm_is_secure(env)` returns false, because the implementation doesn't seem to know about Armv7-M or Armv8-M secure states.  However, `arm_mmu_idx(env)` does know how to check `env->v7m.secure`, so it returns `ARMMMUIdx_MSPriv` (the S stands for secure).  The mismatch between an apparently non-secure access to a secure MMU seems to cause the read to fail laster.
-2. With the MPU enabled (not the case in this repro, but I can provide one), `cpu_memory_rw_debug` computes `page = addr & TARGET_PAGE_MASK`, and uses the page to compute permissions.  However, TARGET_PAGE_MASK is based on 4K pages on this platform, but the MPU granularity is 32 bytes.  So the wrong page is used for checking."""
-reproduce = """```
-# Sorry for the large clone.  It's mostly unused files in CMSIS.
-git clone --recursive -b qemu-repro-1 https://github.com/dreiss/mpu_experiments
-cd mpu_experiments
-git checkout origin/qemu-repro-1
-cmake -S . -B build -DBOARD=qemu-mps2-an505 -DAPP=mpu_stacktrace -DCMAKE_BUILD_TYPE=Debug
-cmake --build build
-/path/to/qemu-system-arm -machine mps2-an505 -nographic -kernel build/kernel.elf -s -S -d int
-# Open a separate terminal and cd into mpu_experiments
-gdb build/kernel.elf -ex 'target remote :1234' -ex 'break base_case' -ex continue -ex backtrace -ex quit
-# Note the memory read failures in the backtrace.
-```"""
-additional = "n/a"