diff options
Diffstat (limited to 'yocto-poky/meta/lib/oe/qa.py')
| -rw-r--r-- | yocto-poky/meta/lib/oe/qa.py | 62 |
1 files changed, 51 insertions, 11 deletions
diff --git a/yocto-poky/meta/lib/oe/qa.py b/yocto-poky/meta/lib/oe/qa.py index d5cdaa0fc..3cfeee737 100644 --- a/yocto-poky/meta/lib/oe/qa.py +++ b/yocto-poky/meta/lib/oe/qa.py @@ -1,3 +1,8 @@ +import os, struct + +class NotELFFileError(Exception): + pass + class ELFFile: EI_NIDENT = 16 @@ -7,6 +12,8 @@ class ELFFile: EI_OSABI = 7 EI_ABIVERSION = 8 + E_MACHINE = 0x12 + # possible values for EI_CLASS ELFCLASSNONE = 0 ELFCLASS32 = 1 @@ -20,10 +27,12 @@ class ELFFile: ELFDATA2LSB = 1 ELFDATA2MSB = 2 + PT_INTERP = 3 + def my_assert(self, expectation, result): if not expectation == result: #print "'%x','%x' %s" % (ord(expectation), ord(result), self.name) - raise Exception("This does not work as expected") + raise NotELFFileError("%s is not an ELF" % self.name) def __init__(self, name, bits = 0): self.name = name @@ -31,10 +40,16 @@ class ELFFile: self.objdump_output = {} def open(self): + if not os.path.isfile(self.name): + raise NotELFFileError("%s is not a normal file" % self.name) + self.file = file(self.name, "r") - self.data = self.file.read(ELFFile.EI_NIDENT+4) + # Read 4k which should cover most of the headers we're after + self.data = self.file.read(4096) + + if len(self.data) < ELFFile.EI_NIDENT + 4: + raise NotELFFileError("%s is not an ELF" % self.name) - self.my_assert(len(self.data), ELFFile.EI_NIDENT+4) self.my_assert(self.data[0], chr(0x7f) ) self.my_assert(self.data[1], 'E') self.my_assert(self.data[2], 'L') @@ -46,24 +61,24 @@ class ELFFile: self.bits = 64 else: # Not 32-bit or 64.. lets assert - raise Exception("ELF but not 32 or 64 bit.") + raise NotELFFileError("ELF but not 32 or 64 bit.") elif self.bits == 32: self.my_assert(self.data[ELFFile.EI_CLASS], chr(ELFFile.ELFCLASS32)) elif self.bits == 64: self.my_assert(self.data[ELFFile.EI_CLASS], chr(ELFFile.ELFCLASS64)) else: - raise Exception("Must specify unknown, 32 or 64 bit size.") + raise NotELFFileError("Must specify unknown, 32 or 64 bit size.") self.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 Exception("self.sex == ELFDATANONE") + raise NotELFFileError("self.sex == ELFDATANONE") elif self.sex == chr(ELFFile.ELFDATA2LSB): self.sex = "<" elif self.sex == chr(ELFFile.ELFDATA2MSB): self.sex = ">" else: - raise Exception("Unknown self.sex") + raise NotELFFileError("Unknown self.sex") def osAbi(self): return ord(self.data[ELFFile.EI_OSABI]) @@ -77,17 +92,36 @@ class ELFFile: def isLittleEndian(self): return self.sex == "<" - def isBigEngian(self): + def isBigEndian(self): return self.sex == ">" + def getShort(self, offset): + return struct.unpack_from(self.sex+"H", self.data, offset)[0] + + def getWord(self, offset): + return struct.unpack_from(self.sex+"i", self.data, offset)[0] + + def isDynamic(self): + """ + Return True if there is a .interp segment (therefore dynamically + linked), otherwise False (statically linked). + """ + offset = self.getWord(self.bits == 32 and 0x1C or 0x20) + size = self.getShort(self.bits == 32 and 0x2A or 0x36) + count = self.getShort(self.bits == 32 and 0x2C or 0x38) + + for i in range(0, count): + p_type = self.getWord(offset + i * size) + if p_type == ELFFile.PT_INTERP: + return True + return False + 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 self.getShort(ELFFile.E_MACHINE) def run_objdump(self, cmd, d): import bb.process @@ -109,3 +143,9 @@ class ELFFile: except Exception as e: bb.note("%s %s %s failed: %s" % (objdump, cmd, self.name, e)) return "" + +if __name__ == "__main__": + import sys + elf = ELFFile(sys.argv[1]) + elf.open() + print elf.isDynamic() |