These set of changes brings QEMU TCG to iOS devices and future Apple Silicon devices. They were originally developed last year and have been working in the UTM app. Recently, we ported the changes to master, re-wrote a lot of the build script changes for meson, and broke up the patches into more distinct units.
A summary of the changes: * `CONFIG_IOS` and `CONFIG_IOS_JIT` defined when building for iOS and iOS specific changes (as well as unsupported code) are gated behind it. * slirp updated to support DNS resolving using libresolv; a separate patch will be submitted to the project. To allow for builds to succeed, the .gitmodule is temporarily changed. We're not entirely sure how cross-project patches should be handled here. * A new dependency, libucontext is added since iOS does not have native ucontext and broken support for sigaltstack. libucontext is available as a new option for coroutine backend. * On stock iOS devices, there is a workaround for running JIT code without any special entitlement. It requires the JIT region to be mirror mapped with one region RW and another one RX. To support this style of JIT, TCG is changed to support writing to a different code_ptr. These changes are gated by the `CONFIG_IOS_JIT`. * For (recent) jailbroken iOS devices as well as upcoming Apple Silicon devices, there are new rules for applications supporting JIT (with the proper entitlement). These rules are implemented as well. * An option to build QEMU as a shared library is added because iOS does not support fork(). These patches are also on Github: https://github.com/utmapp/qemu/tree/ios-support-master -j osy (10): configure: option to disable host block devices configure: cross-compiling without cross_prefix qemu: add support for iOS host meson: option to build as shared library slirp: update for iOS resolv fix coroutine: add libucontext as external library tcg: implement bulletproof JIT tcg: mirror mapping RWX pages for iOS optional tcg: support JIT on Apple Silicon block: check availablity for preadv/pwritev on mac .gitmodules | 5 +- accel/tcg/cpu-exec-common.c | 2 + accel/tcg/cpu-exec.c | 9 +- accel/tcg/tcg-all.c | 27 +++++- accel/tcg/translate-all.c | 169 ++++++++++++++++++++++++++++++++--- block.c | 2 +- block/file-posix.c | 50 ++++++++--- bsd-user/main.c | 2 +- configure | 118 ++++++++++++++++++++++-- docs/devel/ios.rst | 40 +++++++++ include/exec/exec-all.h | 10 +++ include/sysemu/tcg.h | 2 +- include/tcg/tcg-apple-jit.h | 85 ++++++++++++++++++ include/tcg/tcg.h | 21 ++++- libucontext | 1 + linux-user/main.c | 2 +- meson.build | 74 +++++++++++++-- meson_options.txt | 4 + net/slirp.c | 16 ++-- qemu-options.hx | 11 +++ qga/commands-posix.c | 6 ++ slirp | 2 +- target/arm/arm-semi.c | 2 + target/m68k/m68k-semi.c | 2 + target/nios2/nios2-semi.c | 2 + tcg/aarch64/tcg-target.c.inc | 48 ++++++---- tcg/aarch64/tcg-target.h | 23 ++++- tcg/arm/tcg-target.c.inc | 33 ++++--- tcg/arm/tcg-target.h | 9 +- tcg/i386/tcg-target.c.inc | 28 +++--- tcg/i386/tcg-target.h | 24 ++++- tcg/mips/tcg-target.c.inc | 64 +++++++------ tcg/mips/tcg-target.h | 8 +- tcg/ppc/tcg-target.c.inc | 55 +++++++----- tcg/ppc/tcg-target.h | 8 +- tcg/riscv/tcg-target.c.inc | 51 ++++++----- tcg/riscv/tcg-target.h | 9 +- tcg/s390/tcg-target.c.inc | 25 +++--- tcg/s390/tcg-target.h | 13 ++- tcg/sparc/tcg-target.c.inc | 33 ++++--- tcg/sparc/tcg-target.h | 8 +- tcg/tcg-ldst.c.inc | 2 +- tcg/tcg-pool.c.inc | 9 +- tcg/tcg.c | 64 ++++++++----- tcg/tci/tcg-target.c.inc | 8 +- tcg/tci/tcg-target.h | 9 +- tests/qtest/meson.build | 7 +- util/coroutine-ucontext.c | 9 ++ 48 files changed, 965 insertions(+), 246 deletions(-) create mode 100644 docs/devel/ios.rst create mode 100644 include/tcg/tcg-apple-jit.h create mode 160000 libucontext -- 2.24.3 (Apple Git-128)
