Merge remote-tracking branch 'remotes/stsquad/tags/pull-tcg-plugins-281019-4' into staging

TCG Plugins initial implementation

  - use --enable-plugins @ configure
  - low impact introspection (-plugin empty.so to measure overhead)
  - plugins cannot alter guest state
  - example plugins included in source tree (tests/plugins)
  - -d plugin to enable plugin output in logs
  - check-tcg runs extra tests when plugins enabled
  - documentation in docs/devel/plugins.rst

# gpg: Signature made Mon 28 Oct 2019 15:13:23 GMT
# gpg:                using RSA key 6685AE99E75167BCAFC8DF35FBD0DB095A9E2A44
# gpg: Good signature from "Alex Bennée (Master Work Key) <alex.bennee@linaro.org>" [full]
# Primary key fingerprint: 6685 AE99 E751 67BC AFC8  DF35 FBD0 DB09 5A9E 2A44

* remotes/stsquad/tags/pull-tcg-plugins-281019-4: (57 commits)
  travis.yml: enable linux-gcc-debug-tcg cache
  MAINTAINERS: add me for the TCG plugins code
  scripts/checkpatch.pl: don't complain about (foo, /* empty */)
  .travis.yml: add --enable-plugins tests
  include/exec: wrap cpu_ldst.h in CONFIG_TCG
  accel/stubs: reduce headers from tcg-stub
  tests/plugin: add hotpages to analyse memory access patterns
  tests/plugin: add instruction execution breakdown
  tests/plugin: add a hotblocks plugin
  tests/tcg: enable plugin testing
  tests/tcg: drop test-i386-fprem from TESTS when not SLOW
  tests/tcg: move "virtual" tests to EXTRA_TESTS
  tests/tcg: set QEMU_OPTS for all cris runs
  tests/tcg/Makefile.target: fix path to config-host.mak
  tests/plugin: add sample plugins
  linux-user: support -plugin option
  vl: support -plugin option
  plugin: add qemu_plugin_outs helper
  plugin: add qemu_plugin_insn_disas helper
  plugin: expand the plugin_init function to include an info block
  ...

Signed-off-by: Peter Maydell <peter.maydell@linaro.org>

1 files changed, 89 insertions, 0 deletions

diff --git a/configure b/configure
index 3be9e92a24..72553f98ea 100755
--- a/configure
+++ b/configure
@@ -30,6 +30,7 @@ TMPO="${TMPDIR1}/${TMPB}.o"
 TMPCXX="${TMPDIR1}/${TMPB}.cxx"
 TMPE="${TMPDIR1}/${TMPB}.exe"
 TMPMO="${TMPDIR1}/${TMPB}.mo"
+TMPTXT="${TMPDIR1}/${TMPB}.txt"
 
 rm -f config.log
 
@@ -501,6 +502,7 @@ libxml2=""
 debug_mutex="no"
 libpmem=""
 default_devices="yes"
+plugins="no"
 
 supported_cpu="no"
 supported_os="no"
@@ -1532,6 +1534,10 @@ for opt do
   ;;
   --disable-xkbcommon) xkbcommon=no
   ;;
+  --enable-plugins) plugins="yes"
+  ;;
+  --disable-plugins) plugins="no"
+  ;;
   *)
       echo "ERROR: unknown option $opt"
       echo "Try '$0 --help' for more information"
@@ -1713,6 +1719,8 @@ Advanced options (experts only):
   --enable-profiler        profiler support
   --enable-debug-stack-usage
                            track the maximum stack usage of stacks created by qemu_alloc_stack
+  --enable-plugins
+                           enable plugins via shared library loading
 
 Optional features, enabled with --enable-FEATURE and
 disabled with --disable-FEATURE, default is enabled if available:
@@ -3644,6 +3652,9 @@ glib_modules=gthread-2.0
 if test "$modules" = yes; then
     glib_modules="$glib_modules gmodule-export-2.0"
 fi
+if test "$plugins" = yes; then
+    glib_modules="$glib_modules gmodule-2.0"
+fi
 
 # This workaround is required due to a bug in pkg-config file for glib as it
 # doesn't define GLIB_STATIC_COMPILATION for pkg-config --static
@@ -5494,6 +5505,61 @@ if compile_prog "" "" ; then
   atomic64=yes
 fi
 
+#########################################
+# See if --dynamic-list is supported by the linker
+ld_dynamic_list="no"
+if test "$static" = "no" ; then
+    cat > $TMPTXT <<EOF
+{
+  foo;
+};
+EOF
+
+    cat > $TMPC <<EOF
+#include <stdio.h>
+void foo(void);
+
+void foo(void)
+{
+  printf("foo\n");
+}
+
+int main(void)
+{
+  foo();
+  return 0;
+}
+EOF
+
+    if compile_prog "" "-Wl,--dynamic-list=$TMPTXT" ; then
+        ld_dynamic_list="yes"
+    fi
+fi
+
+#########################################
+# See if -exported_symbols_list is supported by the linker
+
+ld_exported_symbols_list="no"
+if test "$static" = "no" ; then
+    cat > $TMPTXT <<EOF
+  _foo
+EOF
+
+    if compile_prog "" "-Wl,-exported_symbols_list,$TMPTXT" ; then
+        ld_exported_symbols_list="yes"
+    fi
+fi
+
+if  test "$plugins" = "yes" &&
+    test "$ld_dynamic_list" = "no" &&
+    test "$ld_exported_symbols_list" = "no" ; then
+  error_exit \
+      "Plugin support requires dynamic linking and specifying a set of symbols " \
+      "that are exported to plugins. Unfortunately your linker doesn't " \
+      "support the flag (--dynamic-list or -exported_symbols_list) used " \
+      "for this purpose. You can't build with --static."
+fi
+
 ########################################
 # See if 16-byte vector operations are supported.
 # Even without a vector unit the compiler may expand these.
@@ -6491,6 +6557,7 @@ echo "capstone          $capstone"
 echo "libpmem support   $libpmem"
 echo "libudev           $libudev"
 echo "default devices   $default_devices"
+echo "plugin support    $plugins"
 
 if test "$supported_cpu" = "no"; then
     echo
@@ -7328,6 +7395,27 @@ if test "$sheepdog" = "yes" ; then
   echo "CONFIG_SHEEPDOG=y" >> $config_host_mak
 fi
 
+if test "$plugins" = "yes" ; then
+    echo "CONFIG_PLUGIN=y" >> $config_host_mak
+    LIBS="-ldl $LIBS"
+    # Copy the export object list to the build dir
+    if test "$ld_dynamic_list" = "yes" ; then
+	echo "CONFIG_HAS_LD_DYNAMIC_LIST=yes" >> $config_host_mak
+	ld_symbols=qemu-plugins-ld.symbols
+	cp "$source_path/plugins/qemu-plugins.symbols" $ld_symbols
+    elif test "$ld_exported_symbols_list" = "yes" ; then
+	echo "CONFIG_HAS_LD_EXPORTED_SYMBOLS_LIST=yes" >> $config_host_mak
+	ld64_symbols=qemu-plugins-ld64.symbols
+	echo "# Automatically generated by configure - do not modify" > $ld64_symbols
+	grep 'qemu_' "$source_path/plugins/qemu-plugins.symbols" | sed 's/;//g' | \
+	    sed -E 's/^[[:space:]]*(.*)/_\1/' >> $ld64_symbols
+    else
+	error_exit \
+	    "If \$plugins=yes, either \$ld_dynamic_list or " \
+	    "\$ld_exported_symbols_list should have been set to 'yes'."
+    fi
+fi
+
 if test "$tcg_interpreter" = "yes"; then
   QEMU_INCLUDES="-iquote \$(SRC_PATH)/tcg/tci $QEMU_INCLUDES"
 elif test "$ARCH" = "sparc64" ; then
@@ -7874,6 +7962,7 @@ DIRS="$DIRS roms/seabios roms/vgabios"
 LINKS="Makefile"
 LINKS="$LINKS tests/tcg/lm32/Makefile po/Makefile"
 LINKS="$LINKS tests/tcg/Makefile.target tests/fp/Makefile"
+LINKS="$LINKS tests/plugin/Makefile"
 LINKS="$LINKS pc-bios/optionrom/Makefile pc-bios/keymaps"
 LINKS="$LINKS pc-bios/s390-ccw/Makefile"
 LINKS="$LINKS roms/seabios/Makefile roms/vgabios/Makefile"