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Diffstat (limited to 'gitlab/issues/target_arm/host_missing/accel_missing/1421.toml')
| -rw-r--r-- | gitlab/issues/target_arm/host_missing/accel_missing/1421.toml | 29 |
1 files changed, 0 insertions, 29 deletions
diff --git a/gitlab/issues/target_arm/host_missing/accel_missing/1421.toml b/gitlab/issues/target_arm/host_missing/accel_missing/1421.toml deleted file mode 100644 index 4476d10e..00000000 --- a/gitlab/issues/target_arm/host_missing/accel_missing/1421.toml +++ /dev/null @@ -1,29 +0,0 @@ -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" |