classes/insane.bbclass: Add a small elf reader and check ABI,ARCH and Endian

Add a small ELF parser and read OSABI, ABIVERSION, ENDIAN and MACHINE. This
code compares TARGET_OS and TARGET_ARCH to a list of known versions. Currently
we have values for linux and linux-uclibc for arm, armeb and powerpc. mips,
i386, amd64, ia64 are missing. ABI wise ARM EABI is missing as well, but koen
is likely to enter the values into the documented dict

1 files changed, 130 insertions, 0 deletions

diff --git a/classes/insane.bbclass b/classes/insane.bbclass
index d11d8ddd7e..54b6b3b2dc 100644
--- a/classes/insane.bbclass
+++ b/classes/insane.bbclass
@@ -24,6 +24,107 @@ inherit package
 PACKAGE_DEPENDS += "pax-utils-native"
 PACKAGEFUNCS += " do_package_qa "
 
+
+#
+# dictionary for elf headers
+#
+# feel free to add and correct. the ARM EABI needs another column and we
+# need mips, i386 and amd64 input (abi versions)
+#
+#           TARGET_OS  TARGET_ARCH   MACHINE, OSABI, ABIVERSION, Little Endian
+def package_qa_get_machine_dict():
+    return {
+            "linux" : { "arm" :       (40,    97,    0,          True),
+                        "armeb":      (40,    97,    0,          False),
+                        "powerpc":    (20,     0,    0,          False),
+                      },
+            "linux-uclibc" : { "arm" :       (40,    97,    0,          True),
+                        "armeb":      (40,    97,    0,          False),
+                        "powerpc":    (20,     0,    0,          False),
+                      },
+        }
+
+# factory for a class, embedded in a method
+def package_qa_get_elf(path):
+    class ELFFile:
+        EI_NIDENT = 16
+
+        EI_CLASS      = 4
+        EI_DATA       = 5
+        EI_VERSION    = 6
+        EI_OSABI      = 7
+        EI_ABIVERSION = 8
+
+        # possible values for EI_CLASS
+        ELFCLASSNONE = 0
+        ELFCLASS32   = 1
+        ELFCLASS64   = 2
+
+        # possible value for EI_VERSION
+        EV_CURRENT   = 1
+
+        # possible values for EI_DATA
+        ELFDATANONE  = 0
+        ELFDATA2LSB  = 1
+        ELFDATA2MSB  = 2
+
+        def my_assert(expectation, result):
+            if not expectation == result:
+                print "'%x','%x'" % (ord(expectation), ord(result))
+                raise "This does not work as expected"
+        my_assert = staticmethod(my_assert)
+
+        def __init__(self, name):
+            self.name = name
+
+        def open(self):
+            self.file = file(self.name, "r")
+            self.data = self.file.read(ELFFile.EI_NIDENT+4)
+
+            ELFFile.my_assert(len(self.data), ELFFile.EI_NIDENT+4)
+            ELFFile.my_assert(self.data[0], chr(0x7f) )
+            ELFFile.my_assert(self.data[1], 'E')
+            ELFFile.my_assert(self.data[2], 'L')
+            ELFFile.my_assert(self.data[3], 'F')
+            ELFFile.my_assert(self.data[ELFFile.EI_CLASS], chr(ELFFile.ELFCLASS32)) # only 32 bits
+            ELFFile.my_assert(self.data[ELFFile.EI_VERSION], chr(ELFFile.EV_CURRENT) )
+
+            self.sex = self.data[ELFFile.EI_DATA]
+            if self.sex == chr(ELFFile.ELFDATANONE):
+                raise "Can't be"
+            elif self.sex == chr(ELFFile.ELFDATA2LSB):
+                print "little"
+                self.sex = "<"
+            elif self.sex == chr(ELFFile.ELFDATA2MSB):
+                print "big"
+                self.sex = ">"
+            else:
+                raise "Even more worse"
+
+        def osAbi(self):
+            return ord(self.data[ELFFile.EI_OSABI])
+
+        def abiVersion(self):
+            return ord(self.data[ELFFile.EI_ABIVERSION])
+
+        def isLittleEndian(self):
+            return self.sex == "<"
+
+        def isBigEngian(self):
+            return self.sex == ">"
+
+        def machine(self):
+            """
+            We know the sex stored in self.sex and we
+            know the position
+            """
+            import struct
+            (a,) = struct.unpack(self.sex+"H", self.data[18:20])
+            return a
+
+    return ELFFile(path)
+
+
 #
 #
 # Known Error classes
@@ -31,6 +132,7 @@ PACKAGEFUNCS += " do_package_qa "
 # 1 - package contains a dangerous RPATH
 # 2 - package depends on debug package
 # 3 - non dbg contains .so
+# 4 - wrong architecture
 #
 #
 
@@ -59,6 +161,7 @@ def package_qa_write_error(error_class, name, path, d):
         "package contains RPATH",
         "package depends on debug package",
         "non dbg contains .debug",
+        "wrong archutecture",
     ]
 
 
@@ -125,7 +228,34 @@ def package_qa_check_arch(path,name,d):
     """
     Check if archs are compatible
     """
+    import bb
+    target_os   = bb.data.getVar('TARGET_OS',   d, True)
+    target_arch = bb.data.getVar('TARGET_ARCH', d, True)
+
+    #this will throw an exception, then fix the dict above
+    (machine, osabi, abiversion, littleendian) = package_qa_get_machine_dict()[target_os][target_arch]
+    elf = package_qa_get_elf(path)
+    try:
+        elf.open()
+    except:
+        # just for debbugging to check the parser, remove once convinced...
+        bb.note("ELF reading failed on '%s'" % path)
+        return True
+
     sane = True
+    if not machine == elf.machine():
+        bb.error("Architecture did not match (%d to %d) on %s", (machine, elf.machine(), package_qa_clean_path(path,d)))
+        sane = package_qa_make_fatal_error( 4, name, path, d )
+    elif not osabi == elf.osAbi():
+        bb.error("OSABI did not match (%d to %d) on %s", (osabi, elf.osAbi(), package_qa_clean_path(path,d)))
+        sane = package_qa_make_fatal_error( 4, name, path, d )
+    elif not abiversion == elf.abiVersion():
+        bb.error("ABI version did not match (%d to %d) on %s", (abiversion, elf.abiVersion(), package_qa_clean_path(path,d)))
+        sane = package_qa_make_fatal_error( 4, name, path, d )
+    elif not littleendian == elf.isLittleEndian():
+        bb.error("Endiannes did not match (%d to %d) on %s", (littleendian, elf.isLittleEndian(), package_qa_clean_path(path,d)))
+        sane = package_qa_make_fatal_error( 4, name, path, d )
+
     return sane
 
 def package_qa_check_pcla(path,name,d):