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Mon, 04 Jan 2021 18:21:03 -0800 (PST) From: Joelle van Dyne To: qemu-devel@nongnu.org Subject: [PATCH v6 4/7] coroutine: add libucontext as external library Date: Mon, 4 Jan 2021 18:20:52 -0800 Message-Id: <20210105022055.12113-5-j@getutm.app> X-Mailer: git-send-email 2.28.0 In-Reply-To: <20210105022055.12113-1-j@getutm.app> References: <20210105022055.12113-1-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=209.85.215.176; envelope-from=osy86github@gmail.com; helo=mail-pg1-f176.google.com 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=0.248, FREEMAIL_FROM=0.001, HEADER_FROM_DIFFERENT_DOMAINS=0.248, RCVD_IN_DNSWL_NONE=-0.0001, RCVD_IN_MSPIKE_H2=-0.001, 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 , Roman Bolshakov , 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" 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 | 11 ++++++++++- util/coroutine-ucontext.c | 9 +++++++++ .gitmodules | 3 +++ meson_options.txt | 2 ++ subprojects/libucontext | 1 + 6 files changed, 45 insertions(+), 4 deletions(-) create mode 160000 subprojects/libucontext diff --git a/configure b/configure index c1a08f0171..09dd22ebad 100755 --- a/configure +++ b/configure @@ -1767,7 +1767,7 @@ Advanced options (experts only): --oss-lib path to OSS library --cpu=3DCPU Build for host CPU [$cpu] --with-coroutine=3DBACKEND coroutine backend. Supported options: - ucontext, sigaltstack, windows + ucontext, libucontext, sigaltstack, windows --enable-gcov enable test coverage analysis with gcov --disable-blobs disable installing provided firmware blobs --with-vss-sdk=3DSDK-path enable Windows VSS support in QEMU Guest Agent @@ -4913,6 +4913,8 @@ if test "$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 @@ -4936,12 +4938,27 @@ 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} subprojects/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 @@ -6487,7 +6504,7 @@ 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" >> $config_host_mak else @@ -7069,7 +7086,7 @@ NINJA=3D$ninja $meson setup \ -Dcocoa=3D$cocoa -Dmpath=3D$mpath -Dsdl=3D$sdl -Dsdl_image=3D$sdl_= image \ -Dvnc=3D$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 -Dvirti= ofsd=3D$virtiofsd \ - -Dcapstone=3D$capstone -Dslirp=3D$slirp -Dfdt=3D$fdt \ + -Dcapstone=3D$capstone -Dslirp=3D$slirp -Dfdt=3D$fdt -Ducontext=3D= $libucontext \ -Diconv=3D$iconv -Dcurses=3D$curses -Dlibudev=3D$libudev\ -Ddocs=3D$docs -Dsphinx_build=3D$sphinx_build -Dinstall_blobs=3D$b= lobs \ -Dvhost_user_blk_server=3D$vhost_user_blk_server \ diff --git a/meson.build b/meson.build index ee333b7a94..900dbc36c8 100644 --- a/meson.build +++ b/meson.build @@ -1308,9 +1308,17 @@ 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 dependency('libucontext', required : false) +if not ucontext.found() and get_option('ucontext').enabled() + libucontext_proj =3D subproject('libucontext', + default_options: ['freestanding=3Dtrue']) + ucontext =3D libucontext_proj.get_variable('libucontext_dep') +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 # @@ -1528,7 +1536,7 @@ 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 @@ -2188,6 +2196,7 @@ 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..220c57a743 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..4f02eed79a 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 subprojects/libucontext + url =3D https://github.com/utmapp/libucontext.git diff --git a/meson_options.txt b/meson_options.txt index 74ac853548..0a93bccea3 100644 --- a/meson_options.txt +++ b/meson_options.txt @@ -70,6 +70,8 @@ option('fuse', type: 'feature', value: 'auto', description: 'FUSE block device export') option('fuse_lseek', type : 'feature', value : 'auto', description: 'SEEK_HOLE/SEEK_DATA support for FUSE exports') +option('ucontext', type : 'feature', value : 'disabled', + description: 'libucontext support') =20 option('capstone', type: 'combo', value: 'auto', choices: ['disabled', 'enabled', 'auto', 'system', 'internal'], diff --git a/subprojects/libucontext b/subprojects/libucontext new file mode 160000 index 0000000000..fc3b5e724e --- /dev/null +++ b/subprojects/libucontext @@ -0,0 +1 @@ +Subproject commit fc3b5e724e21c2c01e2c93b344ab0e34b5a6649b --=20 2.28.0