The register allocator may sometimes pass a 64-bit value to a 32-bit operation if truncations are considered no-ops by the backend. When this happens, user-mode emulation may use an incorrect offset for loads and stores. This affects aarch64 and x86, because other architectures already zero-extend the offset before using it for a load or store.
To fix this for aarch64, use the uxtw modifier on load and store instructions. Paolo Paolo Bonzini (2): tcg: aarch64: add ext argument to tcg_out_insn_3310 tcg: aarch64: use 32-bit offset for 32-bit user-mode emulation tcg/aarch64/tcg-target.c | 63 +++++++++++++++++++++++++++--------------------- 1 file changed, 36 insertions(+), 27 deletions(-) -- 2.4.3
