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Sun, 18 Oct 2020 22:20:02 -0700 (PDT) From: Joelle van Dyne To: qemu-devel@nongnu.org Subject: [PATCH RESEND v2 4/9] coroutine: add libucontext as external library Date: Sun, 18 Oct 2020 22:19:48 -0700 Message-Id: <20201019051953.90107-5-j@getutm.app> X-Mailer: git-send-email 2.28.0 In-Reply-To: <20201019051953.90107-1-j@getutm.app> References: <20201019051953.90107-1-j@getutm.app> MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable Received-SPF: pass (zohomail.com: domain of gnu.org designates 209.51.188.17 as permitted sender) client-ip=209.51.188.17; envelope-from=qemu-devel-bounces+importer=patchew.org@nongnu.org; helo=lists.gnu.org; Received-SPF: pass client-ip=209.85.210.181; envelope-from=osy86github@gmail.com; helo=mail-pf1-f181.google.com X-detected-operating-system: by eggs.gnu.org: First seen = 2020/10/19 01:20:02 X-ACL-Warn: Detected OS = Linux 2.2.x-3.x [generic] [fuzzy] X-Spam_score_int: -13 X-Spam_score: -1.4 X-Spam_bar: - X-Spam_report: (-1.4 / 5.0 requ) BAYES_00=-1.9, FREEMAIL_FORGED_FROMDOMAIN=0.249, FREEMAIL_FROM=0.001, HEADER_FROM_DIFFERENT_DOMAINS=0.25, RCVD_IN_DNSWL_NONE=-0.0001, RCVD_IN_MSPIKE_H3=-0.01, RCVD_IN_MSPIKE_WL=-0.01, SPF_HELO_NONE=0.001, SPF_PASS=-0.001 autolearn=no autolearn_force=no X-Spam_action: no action X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.23 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: Kevin Wolf , Joelle van Dyne , Stefan Hajnoczi Errors-To: qemu-devel-bounces+importer=patchew.org@nongnu.org Sender: "Qemu-devel" Content-Type: text/plain; charset="utf-8" From: osy iOS does not support ucontext natively for aarch64 and the sigaltstack is also unsupported (even worse, it fails silently, see: https://openradar.appspot.com/13002712 ) As a workaround we include a library implementation of ucontext and add it as a build option. Signed-off-by: Joelle van Dyne --- configure | 23 ++++++++++++++++++++--- meson.build | 29 ++++++++++++++++++++++++++++- util/coroutine-ucontext.c | 9 +++++++++ .gitmodules | 3 +++ libucontext | 1 + meson_options.txt | 2 ++ 6 files changed, 63 insertions(+), 4 deletions(-) create mode 160000 libucontext diff --git a/configure b/configure index 12d65397b1..e7e6ba2c45 100755 --- a/configure +++ b/configure @@ -1757,7 +1757,7 @@ Advanced options (experts only): --oss-lib path to OSS library --cpu=3DCPU Build for host CPU [$cpu] --with-coroutine=3DBACKEND coroutine backend. Supported options: - ucontext, sigaltstack, windows + ucontext, libucontext, sigaltstack, windows --enable-gcov enable test coverage analysis with gcov --disable-blobs disable installing provided firmware blobs --with-vss-sdk=3DSDK-path enable Windows VSS support in QEMU Guest Agent @@ -4929,6 +4929,8 @@ if test "$coroutine" =3D ""; then coroutine=3Dwin32 elif test "$ucontext_works" =3D "yes"; then coroutine=3Ducontext + elif test "$ios" =3D "yes"; then + coroutine=3Dlibucontext else coroutine=3Dsigaltstack fi @@ -4952,12 +4954,27 @@ else error_exit "only the 'windows' coroutine backend is valid for Window= s" fi ;; + libucontext) + ;; *) error_exit "unknown coroutine backend $coroutine" ;; esac fi =20 +case $coroutine in +libucontext) + git_submodules=3D"${git_submodules} libucontext" + mkdir -p libucontext + coroutine_impl=3Ducontext + libucontext=3D"enabled" + ;; +*) + coroutine_impl=3D$coroutine + libucontext=3D"disabled" + ;; +esac + if test "$coroutine_pool" =3D ""; then coroutine_pool=3Dyes fi @@ -6534,7 +6551,7 @@ if test "$rbd" =3D "yes" ; then echo "RBD_LIBS=3D$rbd_libs" >> $config_host_mak fi =20 -echo "CONFIG_COROUTINE_BACKEND=3D$coroutine" >> $config_host_mak +echo "CONFIG_COROUTINE_BACKEND=3D$coroutine_impl" >> $config_host_mak if test "$coroutine_pool" =3D "yes" ; then echo "CONFIG_COROUTINE_POOL=3D1" >> $config_host_mak else @@ -7133,7 +7150,7 @@ NINJA=3D${ninja:-$PWD/ninjatool} $meson setup \ -Dvnc=3D$vnc -Dvnc_sasl=3D$vnc_sasl -Dvnc_jpeg=3D$vnc_jpeg -Dvnc_p= ng=3D$vnc_png \ -Dgettext=3D$gettext -Dxkbcommon=3D$xkbcommon -Du2f=3D$u2f \ -Dcapstone=3D$capstone -Dslirp=3D$slirp -Dfdt=3D$fdt \ - -Diconv=3D$iconv -Dcurses=3D$curses \ + -Diconv=3D$iconv -Dcurses=3D$curses -Ducontext=3D$libucontext \ $cross_arg \ "$PWD" "$source_path" =20 diff --git a/meson.build b/meson.build index ea7c10ba08..888a3b156d 100644 --- a/meson.build +++ b/meson.build @@ -1170,9 +1170,35 @@ if not fdt.found() and fdt_required.length() > 0 error('fdt not available but required by targets ' + ', '.join(fdt_requi= red)) endif =20 +ucontext =3D not_found +slirp_opt =3D 'disabled' +if get_option('ucontext').enabled() + if not fs.is_dir(meson.current_source_dir() / 'libucontext/arch' / cpu) + error('libucontext is wanted but not implemented for host ' + cpu) + endif + arch =3D host_machine.cpu() + ucontext_cargs =3D ['-DG_LOG_DOMAIN=3D"ucontext"', '-DCUSTOM_IMPL'] + ucontext_files =3D [ + 'libucontext/arch' / arch / 'getcontext.S', + 'libucontext/arch' / arch / 'setcontext.S', + 'libucontext/arch' / arch / 'makecontext.c', + 'libucontext/arch' / arch / 'startcontext.S', + 'libucontext/arch' / arch / 'swapcontext.S', + ] + + ucontext_inc =3D include_directories('libucontext/include') + libucontext =3D static_library('ucontext', + sources: ucontext_files, + c_args: ucontext_cargs, + include_directories: ucontext_inc) + ucontext =3D declare_dependency(link_with: libucontext, + include_directories: ucontext_inc) +endif + config_host_data.set('CONFIG_CAPSTONE', capstone.found()) config_host_data.set('CONFIG_FDT', fdt.found()) config_host_data.set('CONFIG_SLIRP', slirp.found()) +config_host_data.set('CONFIG_LIBUCONTEXT', ucontext.found()) =20 ##################### # Generated sources # @@ -1399,7 +1425,7 @@ util_ss.add_all(trace_ss) util_ss =3D util_ss.apply(config_all, strict: false) libqemuutil =3D static_library('qemuutil', sources: util_ss.sources() + stub_ss.sources(= ) + genh, - dependencies: [util_ss.dependencies(), m, gli= b, socket, malloc]) + dependencies: [util_ss.dependencies(), m, gli= b, socket, malloc, ucontext]) qemuutil =3D declare_dependency(link_with: libqemuutil, sources: genh + version_res) =20 @@ -2049,6 +2075,7 @@ if targetos =3D=3D 'windows' summary_info +=3D {'QGA MSI support': config_host.has_key('CONFIG_QGA_= MSI')} endif summary_info +=3D {'seccomp support': config_host.has_key('CONFIG_SECCOM= P')} +summary_info +=3D {'libucontext support': ucontext.found()} summary_info +=3D {'coroutine backend': config_host['CONFIG_COROUTINE_BACK= END']} summary_info +=3D {'coroutine pool': config_host['CONFIG_COROUTINE_POOL= '] =3D=3D '1'} summary_info +=3D {'debug stack usage': config_host.has_key('CONFIG_DEBUG_= STACK_USAGE')} diff --git a/util/coroutine-ucontext.c b/util/coroutine-ucontext.c index 904b375192..1e1dd43512 100644 --- a/util/coroutine-ucontext.c +++ b/util/coroutine-ucontext.c @@ -23,7 +23,16 @@ #undef _FORTIFY_SOURCE #endif #include "qemu/osdep.h" +#if defined(CONFIG_LIBUCONTEXT) +#include +#define ucontext_t libucontext_ucontext_t +#define getcontext libucontext_getcontext +#define setcontext libucontext_setcontext +#define swapcontext libucontext_swapcontext +#define makecontext libucontext_makecontext +#else #include +#endif #include "qemu/coroutine_int.h" =20 #ifdef CONFIG_VALGRIND_H diff --git a/.gitmodules b/.gitmodules index 2bdeeacef8..065b52867f 100644 --- a/.gitmodules +++ b/.gitmodules @@ -64,3 +64,6 @@ [submodule "roms/vbootrom"] path =3D roms/vbootrom url =3D https://git.qemu.org/git/vbootrom.git +[submodule "libucontext"] + path =3D libucontext + url =3D https://github.com/utmapp/libucontext.git diff --git a/libucontext b/libucontext new file mode 160000 index 0000000000..7094e4c427 --- /dev/null +++ b/libucontext @@ -0,0 +1 @@ +Subproject commit 7094e4c42723b6178a4e2b60d4631d8a88f40719 diff --git a/meson_options.txt b/meson_options.txt index e6cb1e589b..4e3f2e6b99 100644 --- a/meson_options.txt +++ b/meson_options.txt @@ -52,6 +52,8 @@ option('vnc_sasl', type : 'feature', value : 'auto', description: 'SASL authentication for VNC server') option('xkbcommon', type : 'feature', value : 'auto', description: 'xkbcommon support') +option('ucontext', type : 'feature', value : 'disabled', + description: 'libucontext support') =20 option('capstone', type: 'combo', value: 'auto', choices: ['disabled', 'enabled', 'auto', 'system', 'internal'], --=20 2.24.3 (Apple Git-128)