To aid in debugging TCG, we enable a "mirror map" feature that, when enabled, will use memfd_create() to create two mappings of the same memory for RW and RX. The feature is only built when targeting system emulation on Linux and configured with --enable-debug-tcg. It can be disabled with the runtime argument `-accel tcg,mirror-jit=off`.
Although this patch only enables this feature for Linux, the main goal of this is to enable, through a future patch, iOS JIT on older devices which require strict W^X separation. Resending because of merge conflict to current master. -j Joelle van Dyne (4): tcg: add const hints for code pointers tcg: implement mirror mapped JIT for Linux tcg: use mirror map JIT in code generation tcg: make mirror mapped JIT optional configure | 13 +++++ meson.build | 1 + include/exec/exec-all.h | 8 +++ include/sysemu/tcg.h | 2 +- include/tcg/tcg.h | 26 +++++++-- tcg/aarch64/tcg-target.h | 18 +++++- tcg/arm/tcg-target.h | 15 ++++- tcg/i386/tcg-target.h | 26 ++++++++- tcg/mips/tcg-target.h | 12 +++- tcg/ppc/tcg-target.h | 12 +++- tcg/riscv/tcg-target.h | 13 ++++- tcg/s390/tcg-target.h | 17 +++++- tcg/sparc/tcg-target.h | 12 +++- tcg/tci/tcg-target.h | 9 ++- accel/tcg/cpu-exec.c | 7 ++- accel/tcg/tcg-all.c | 31 +++++++++- accel/tcg/translate-all.c | 106 +++++++++++++++++++++++++++++------ bsd-user/main.c | 2 +- linux-user/main.c | 2 +- tcg/tcg.c | 60 +++++++++++++------- qemu-options.hx | 11 ++++ tcg/aarch64/tcg-target.c.inc | 48 +++++++++------- tcg/arm/tcg-target.c.inc | 33 ++++++----- tcg/i386/tcg-target.c.inc | 28 ++++----- tcg/mips/tcg-target.c.inc | 64 ++++++++++++--------- tcg/ppc/tcg-target.c.inc | 57 ++++++++++++------- tcg/riscv/tcg-target.c.inc | 51 +++++++++-------- tcg/s390/tcg-target.c.inc | 25 +++++---- tcg/sparc/tcg-target.c.inc | 33 ++++++----- tcg/tcg-ldst.c.inc | 2 +- tcg/tcg-pool.c.inc | 9 +-- tcg/tci/tcg-target.c.inc | 8 +-- 32 files changed, 555 insertions(+), 206 deletions(-) -- 2.28.0
