crosstap2 is similar to existing crosstap shell script, but unlike crosstap
script that can handle only kernel SystemTap scripts, crosstap2 can also
deal with user land related SystemTap scripts. It discovers and set up
proper --sysroot arguments for stap invocation.

The logic of handling of user-land related cross build arguments is a bit
more complicated. It seemed that to implement it in existing crosstap
script would be a stretch, so crosstap2 is written in python.

Signed-off-by: Victor Kamensky <kamen...@cisco.com>
---
 scripts/crosstap2 | 422 ++++++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 422 insertions(+)
 create mode 100755 scripts/crosstap2

diff --git a/scripts/crosstap2 b/scripts/crosstap2
new file mode 100755
index 0000000..c5209d2
--- /dev/null
+++ b/scripts/crosstap2
@@ -0,0 +1,422 @@
+#!/usr/bin/env python3
+#
+# Build a systemtap script for a given image.
+#
+# Effectively script extracts needed information from set of
+# 'bitbake -e' commands and contructs proper invocation of stap on
+# host to build systemtap script for a given target.
+#
+# By default script will compile scriptname.ko that could be copied
+# to taget and activated with 'staprun scriptname.ko' command. Or if
+# --remote user@hostname option is specified script will build, load
+# execute script on target.
+#
+# This script is very similar and inspired by crosstap shell script.
+# The major difference that this script supports user-land related
+# systemtap script, whereas crosstap could deal only with scripts
+# related to kernel.
+#
+# Copyright (c) 2018, Cisco Systems.
+# All rights reserved.
+#
+# This program is free software; you can redistribute it and/or modify
+# it under the terms of the GNU General Public License version 2 as
+# published by the Free Software Foundation.
+#
+# This program is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
+# See the GNU General Public License for more details.
+#
+# You should have received a copy of the GNU General Public License
+# along with this program; if not, write to the Free Software
+# Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
+
+import sys
+import re
+import subprocess
+import os
+
+from optparse import OptionParser
+
+class Stap(object):
+    def __init__(self, script, module, remote):
+        self.script = script
+        self.module = module
+        self.remote = remote
+        self.stap = None
+        self.sysroot = None
+        self.runtime = None
+        self.tapset = None
+        self.arch = None
+        self.cross_compile = None
+        self.kernel_release = None
+        self.target_path = None
+        self.target_ld_library_path = None
+
+        if not self.remote:
+            if not self.module:
+                # derive module name from script
+                self.module = os.path.basename(self.script)
+                if self.module[-4:] == ".stp":
+                    self.module = self.module[:-4]
+                    # replace - if any with _
+                    self.module = self.module.replace("-", "_")
+
+    def command(self, args):
+        ret = []
+        ret.append(self.stap)
+
+        if self.remote:
+            ret.append("--remote")
+            ret.append(self.remote)
+        else:
+            ret.append("-p4")
+            ret.append("-m")
+            ret.append(self.module)
+
+        ret.append("--sysroot")
+        ret.append(self.sysroot)
+
+        ret.append("-a")
+        ret.append(self.arch)
+
+        ret.append("-B")
+        ret.append("CROSS_COMPILE=" + self.cross_compile)
+
+        ret.append("-r")
+        ret.append(self.kernel_release)
+
+        ret.append("-I")
+        ret.append(self.tapset)
+
+        ret.append("-R")
+        ret.append(self.runtime)
+
+        ret.append("--sysenv=PATH=" + self.target_path)
+        ret.append("--sysenv=LD_LIBRARY_PATH=" + self.target_ld_library_path)
+
+        ret = ret + args
+
+        ret.append(self.script)
+        return ret
+
+    def additional_environment(self):
+        ret = {}
+        ret["SYSTEMTAP_DEBUGINFO_PATH"] = "+:.debug:build"
+        return ret
+
+    def environment(self):
+        ret = os.environ.copy()
+        additional = self.additional_environment()
+        for e in additional:
+            ret[e] = additional[e]
+        return ret
+
+    def display_command(self, args):
+        additional_env = self.additional_environment()
+        command = self.command(args)
+
+        print("#!/bin/sh")
+        for e in additional_env:
+            print("export %s=\"%s\"" % (e, additional_env[e]))
+        print(" ".join(command))
+
+class BitbakeEnvInvocationException(Exception):
+    def __init__(self, message):
+        self.message = message
+
+class BitbakeEnv(object):
+    BITBAKE="bitbake"
+
+    def __init__(self, package):
+        self.package = package
+        self.cmd = BitbakeEnv.BITBAKE + " -e " + self.package
+        self.popen = subprocess.Popen(self.cmd, shell=True,
+                                      stdout=subprocess.PIPE,
+                                      stderr=subprocess.STDOUT)
+        self.__lines = self.popen.stdout.readlines()
+        self.popen.wait()
+
+        self.lines = []
+        for line in self.__lines:
+                self.lines.append(line.decode('utf-8'))
+
+    def get_vars(self, vars):
+        if self.popen.returncode:
+            raise BitbakeEnvInvocationException(
+                "\nFailed to execute '" + self.cmd +
+                "' with the following message:\n" +
+                ''.join(self.lines))
+
+        search_patterns = []
+        retdict = {}
+        for var in vars:
+            # regular not exported variable
+            rexpr = "^" + var + "=\"(.*)\""
+            re_compiled = re.compile(rexpr)
+            search_patterns.append((var, re_compiled))
+
+            # exported variable
+            rexpr = "^export " + var + "=\"(.*)\""
+            re_compiled = re.compile(rexpr)
+            search_patterns.append((var, re_compiled))
+
+            for line in self.lines:
+                for var, rexpr in search_patterns:
+                    m = rexpr.match(line)
+                    if m:
+                        value = m.group(1)
+                        retdict[var] = value
+
+        # fill variables values in order how they were requested
+        ret = []
+        for var in vars:
+            ret.append(retdict.get(var))
+
+        # if it is single value list return it as scalar, not the list
+        if len(ret) == 1:
+            ret = ret[0]
+
+        return ret
+
+class ParamDiscovery(object):
+    SYMBOLS_CHECK_MESSAGE = """
+WARNING: image '%s' does not have dbg-pkgs IMAGE_FEATURES enabled and no
+IMAGE_GEN_COMBINED_DEBUGFS="1" options is specified. As result the image does
+not have symbols for user-land processes DWARF based probes. Consider
+adding 'dbg-pkgs' to EXTRA_IMAGE_FEATURES or set 
IMAGE_GEN_COMBINED_DEBUGFS="1".
+Or you may use IMAGE_GEN_DEBUGFS="1" option, and then after build you need
+recombine/unpack image and image-dbg tarballs and pass resulting dir location
+with --sysroot option.
+"""
+
+    def __init__(self, image):
+        self.image = image
+
+        self.image_rootfs = None
+        self.image_features = None
+        self.image_gen_debugfs = None
+        self.base_bindir = None
+        self.base_sbindir = None
+        self.base_libdir = None
+        self.bindir = None
+        self.sbindir = None
+        self.libdir = None
+
+        self.staging_bindir_toolchain = None
+        self.target_prefix = None
+        self.target_arch = None
+        self.target_kernel_builddir = None
+
+        self.staging_dir_native = None
+
+    def discover(self):
+        benv_image = BitbakeEnv(self.image)
+        (self.image_rootfs,
+         self.image_features,
+         self.image_gen_debugfs,
+         self.image_gen_combined_debugfs,
+         self.base_bindir,
+         self.base_sbindir,
+         self.base_libdir,
+         self.bindir,
+         self.sbindir,
+         self.libdir
+        ) = benv_image.get_vars(
+             ("IMAGE_ROOTFS",
+              "IMAGE_FEATURES",
+              "IMAGE_GEN_DEBUGFS",
+              "IMAGE_GEN_COMBINED_DEBUGFS",
+              "base_bindir",
+              "base_sbindir",
+              "base_libdir",
+              "bindir",
+              "sbindir",
+              "libdir"
+              ))
+
+        benv_kernel = BitbakeEnv("virtual/kernel")
+        (self.staging_bindir_toolchain,
+         self.target_prefix,
+         self.target_arch,
+         self.target_kernel_builddir
+        ) = benv_kernel.get_vars(
+             ("STAGING_BINDIR_TOOLCHAIN",
+              "TARGET_PREFIX",
+              "TRANSLATED_TARGET_ARCH",
+              "B"
+            ))
+
+        benv_systemtap = BitbakeEnv("systemtap-native")
+        (self.staging_dir_native
+        ) = benv_systemtap.get_vars(["STAGING_DIR_NATIVE"])
+
+    def check(self, sysroot_option):
+        ret = True
+        sysroot = self.image_rootfs
+        if not os.path.isdir(self.image_rootfs):
+            print("ERROR: Cannot find '" + sysroot +
+                  "' directory. Was '" + self.image + "' image built?")
+            ret = False
+
+        stap = self.staging_dir_native + "/usr/bin/stap"
+        if not os.path.isfile(stap):
+            print("ERROR: Cannot find '" + stap +
+                  "'. Was 'systemtap-native' built?")
+            ret = False
+
+        if not os.path.isdir(self.target_kernel_builddir):
+            print("ERROR: Cannot find '" + self.target_kernel_builddir +
+                  "' directory. Was 'kernel/virtual' built?")
+            ret = False
+
+        if not sysroot_option:
+            dbg_pkgs_found = False
+
+            if self.image_features:
+                image_features = self.image_features.split()
+                if "dbg-pkgs" in image_features:
+                    dbg_pkgs_found = True
+
+            if not dbg_pkgs_found \
+               and self.image_gen_combined_debugfs != "1":
+                print(ParamDiscovery.SYMBOLS_CHECK_MESSAGE % (self.image))
+
+        if not ret:
+            print("")
+
+        return ret
+
+    def __map_systemtap_arch(self):
+        a = self.target_arch
+        ret = a
+        if   re.match('(athlon|x86.64)$', a):
+            ret = 'x86_64'
+        elif re.match('i.86$', a):
+            ret = 'i386'
+        elif re.match('arm$', a):
+            ret = 'arm'
+        elif re.match('aarch64$', a):
+            ret = 'arm64'
+        elif re.match('mips(isa|)(32|64|)(r6|)(el|)$', a):
+            ret = 'mips'
+        elif re.match('p(pc|owerpc)(|64)', a):
+            ret = 'powerpc'
+        return ret
+
+    def fill_stap(self, stap):
+        stap.stap = self.staging_dir_native + "/usr/bin/stap"
+        if not stap.sysroot:
+            if self.image_gen_combined_debugfs == "1":
+                stap.sysroot = self.image_rootfs + "-dbg"
+            else:
+                stap.sysroot = self.image_rootfs
+        stap.runtime = self.staging_dir_native + "/usr/share/systemtap/runtime"
+        stap.tapset = self.staging_dir_native + "/usr/share/systemtap/tapset"
+        stap.arch = self.__map_systemtap_arch()
+        stap.cross_compile = self.staging_bindir_toolchain + "/" + \
+                             self.target_prefix
+        stap.kernel_release = self.target_kernel_builddir
+
+        # do we have standard that tells in which order these need to appear
+        target_path = []
+        if self.sbindir:
+            target_path.append(self.sbindir)
+        if self.bindir:
+            target_path.append(self.bindir)
+        if self.base_sbindir:
+            target_path.append(self.base_sbindir)
+        if self.base_bindir:
+            target_path.append(self.base_bindir)
+        stap.target_path = ":".join(target_path)
+
+        target_ld_library_path = []
+        if self.libdir:
+            target_ld_library_path.append(self.libdir)
+        if self.base_libdir:
+            target_ld_library_path.append(self.base_libdir)
+        stap.target_ld_library_path = ":".join(target_ld_library_path)
+
+
+def main():
+    usage = """usage: %prog [script options] [-- [systemtap options]]
+
+%prog cross compile given SystemTap script against given image
+
+It needs to run in environtment set for bitbake - it uses bitbake -e
+invocations to retrieve information to construct proper stap cross build
+invocation arguments. It assumes that systemtap-native is built in given
+bitbake workspace.
+
+Anything after -- option is passed directly to stap.
+
+Script name '-s' and image name '-i' are only mandatory options."""
+
+    option_parser = OptionParser(usage=usage)
+
+    option_parser.add_option("-s", "--script", dest="script",
+                             help="specify input script FILE name",
+                             metavar="FILE")
+
+    option_parser.add_option("-i", "--image", dest="image",
+                             help="specify image name for which script should 
be compiled")
+
+    option_parser.add_option("-r", "--remote", dest="remote",
+                             help="specify username@hostname of remote target 
to run script"
+                             "optional, it assumes that remote target can be 
accessed through ssh")
+
+    option_parser.add_option("-m", "--module", dest="module",
+                             help="specify module name, optional, has effect 
only if --remote is not used, "
+                             "if not specified module name will derived from 
passed script name")
+
+    option_parser.add_option("-y", "--sysroot", dest="sysroot",
+                             help="explicitely specify image sysroot location. 
May need to use in case "
+                             "when IMAGE_GEN_DEBUGFS=\"1\" option is used and 
recombined with symbols "
+                             "in different location",
+                             metavar="DIR")
+
+    option_parser.add_option("-o", "--out", dest="out",
+                             action="store_true",
+                             help="output shell script that equvivalent 
invocation of this script with "
+                             "given set of arguments, in given bitbake 
environment. It could be stored in "
+                             "separate shell script and could be repeated 
without incuring bitbake -e "
+                             "invocation overhead",
+                             default=False)
+
+    option_parser.add_option("-d", "--debug", dest="debug",
+                             action="store_true",
+                             help="enable debug output. Use this option to see 
resulting stap invocation",
+                             default=False)
+
+
+
+    (options, remaining_args) = option_parser.parse_args()
+    if not options.script or not options.image:
+        if not options.script:
+            print("'-s FILE' option is missing\n")
+        if not options.image:
+            print("'-i IMAGE' option is missing\n")
+        option_parser.print_help()
+    else:
+        stap = Stap(options.script, options.module, options.remote)
+        discovery = ParamDiscovery(options.image)
+        discovery.discover()
+        if not discovery.check(options.sysroot):
+            option_parser.print_help()
+        else:
+            stap.sysroot = options.sysroot
+            discovery.fill_stap(stap)
+
+            if options.out:
+                stap.display_command(remaining_args)
+            else:
+                cmd = stap.command(remaining_args)
+                env = stap.environment()
+
+                if options.debug:
+                    print(" ".join(cmd))
+
+                os.execve(cmd[0], cmd, env)
+
+main()
-- 
2.7.4

-- 
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