Encode labels as untyped local symbols in ELF
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5
TODO
5
TODO
@ -9,10 +9,7 @@
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- Don't ignore relocations where the symbol is not defined in the symbol table.
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Report an error about an undefined symbol.
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- JumpLabels inside functions are encoded as functions. Distinguish between
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labels (e.g. .A0 or .L0) and global functions. Lables are NOTYPE LOCAL.
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- Sort the symbols so that local symbols come first. Some table header had a
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number specifiying the index of the first non-local symbol. Adjust that number.
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- Labels should start with a dot, ".L", not just "L0" or "L1".
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# Name analysis
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@ -3,20 +3,26 @@ module Language.Elna.Object.ElfCoder
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( ElfEnvironment(..)
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, ElfWriter(..)
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, ElfHeaderResult(..)
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, elfHeaderSize
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, UnresolvedRelocation(..)
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, UnresolvedRelocations(..)
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, addHeaderToResult
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, addSectionHeader
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, elfHeaderSize
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, elfObject
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, elfSectionsSize
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, putSectionHeader
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, partitionSymbols
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, module Language.Elna.Object.Elf
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) where
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import Control.Exception (throwIO)
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import Control.Monad.IO.Class (MonadIO(..))
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import Control.Monad.Trans.State (StateT, runStateT, modify', gets)
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import Data.Bits (Bits(..))
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import Data.ByteString (StrictByteString)
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import qualified Data.ByteString as ByteString
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import qualified Data.ByteString.Builder as ByteString.Builder
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import Data.Word (Word8)
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import Data.Vector (Vector)
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import qualified Data.Vector as Vector
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import System.IO (Handle, IOMode(..), SeekMode(..), hSeek, withFile)
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@ -26,6 +32,10 @@ import Language.Elna.Object.StringTable (StringTable)
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import qualified Language.Elna.Object.StringTable as StringTable
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import GHC.Records (HasField(..))
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data UnresolvedRelocation = UnresolvedRelocation StrictByteString Elf32_Addr Word8
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data UnresolvedRelocations =
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UnresolvedRelocations (Vector UnresolvedRelocation) (ElfHeaderResult Elf32_Sym) Elf32_Word
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data ElfEnvironment = ElfEnvironment
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{ objectHeaders :: ElfHeaderResult Elf32_Shdr
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, objectHandle :: Handle
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@ -57,6 +67,11 @@ instance MonadIO ElfWriter
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where
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liftIO = ElfWriter . liftIO
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partitionSymbols :: ElfHeaderResult Elf32_Sym -> (Vector Elf32_Sym, Vector Elf32_Sym)
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partitionSymbols = Vector.partition go . getField @"sectionHeaders"
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where
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go Elf32_Sym{ st_info } = (st_info .&. 0xf0) == 0
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-- | ELF header size.
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elfHeaderSize :: Elf32_Off
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elfHeaderSize = 52
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@ -67,16 +82,17 @@ elfSectionsSize :: Vector Elf32_Shdr -> Elf32_Off
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elfSectionsSize = (elfHeaderSize +)
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. Vector.foldr ((+) . sh_size) 0
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addSectionHeader :: StrictByteString -> Elf32_Shdr -> ElfWriter ()
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addSectionHeader name newHeader = ElfWriter $ modify' modifier
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where
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modifier elfEnvironment@ElfEnvironment{ objectHeaders } =
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let ElfHeaderResult{..} = objectHeaders
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in elfEnvironment
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{ objectHeaders = ElfHeaderResult
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addHeaderToResult :: StrictByteString -> a -> ElfHeaderResult a -> ElfHeaderResult a
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addHeaderToResult name newHeader accumulator@ElfHeaderResult{..} = accumulator
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{ sectionHeaders = Vector.snoc sectionHeaders newHeader
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, sectionNames = StringTable.append name sectionNames
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}
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addSectionHeader :: StrictByteString -> Elf32_Shdr -> ElfWriter ()
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addSectionHeader name newHeader = ElfWriter $ modify' modifier
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where
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modifier elfEnvironment@ElfEnvironment{ objectHeaders } = elfEnvironment
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{ objectHeaders = addHeaderToResult name newHeader objectHeaders
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}
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putSectionHeader :: StrictByteString -> Elf32_Shdr -> StrictByteString -> ElfWriter ()
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@ -1,5 +1,6 @@
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module Language.Elna.RiscV.CodeGenerator
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( Statement(..)
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( Directive(..)
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, Statement(..)
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, generateRiscV
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, riscVConfiguration
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) where
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@ -3,7 +3,6 @@ module Language.Elna.RiscV.ElfWriter
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( riscv32Elf
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) where
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import Data.Word (Word8)
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import Data.ByteString (StrictByteString)
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import qualified Data.ByteString as ByteString
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import qualified Data.ByteString.Builder as ByteString.Builder
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@ -12,7 +11,6 @@ import Data.Vector (Vector)
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import qualified Data.Vector as Vector
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import Language.Elna.Object.ElfCoder
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( ByteOrder(..)
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, Elf32_Addr
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, Elf32_Ehdr(..)
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, Elf32_Half
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, Elf32_Word
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@ -31,6 +29,10 @@ import Language.Elna.Object.ElfCoder
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, ElfWriter(..)
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, ElfHeaderResult(..)
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, ElfEnvironment(..)
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, UnresolvedRelocation(..)
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, UnresolvedRelocations(..)
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, addHeaderToResult
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, addSectionHeader
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, elf32Sym
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, elfHeaderSize
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, elfSectionsSize
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@ -38,53 +40,27 @@ import Language.Elna.Object.ElfCoder
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, rInfo
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, elf32Rel
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, shfInfoLink
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, addSectionHeader
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, partitionSymbols
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, putSectionHeader
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)
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import qualified Language.Elna.Architecture.RiscV as RiscV
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import qualified Data.Text.Encoding as Text
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import Control.Monad.IO.Class (MonadIO(..))
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import Control.Monad.Trans.State (get, gets)
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import Language.Elna.RiscV.CodeGenerator (Statement(..))
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import Language.Elna.RiscV.CodeGenerator (Directive(..), Statement(..))
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import Language.Elna.Object.StringTable (StringTable)
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import qualified Language.Elna.Object.StringTable as StringTable
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import qualified Data.HashSet as HashSet
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import GHC.Records (HasField(..))
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data UnresolvedRelocation = UnresolvedRelocation StrictByteString Elf32_Addr Word8
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data UnresolvedRelocations = UnresolvedRelocations (Vector UnresolvedRelocation) Elf32_Word
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riscv32Elf :: Vector Statement -> ElfWriter Elf32_Ehdr
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riscv32Elf code = text
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riscv32Elf code = text code
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>>= symtab
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>>= uncurry symrel
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>>= strtab
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>> shstrtab
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>>= riscv32Header
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where
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shstrtab :: ElfWriter Elf32_Half
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shstrtab = do
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ElfHeaderResult{..} <- ElfWriter $ gets $ getField @"objectHeaders"
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let stringTable = ".shstrtab"
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currentNamesSize = StringTable.size sectionNames
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nextHeader = Elf32_Shdr
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{ sh_type = SHT_STRTAB
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, sh_size = currentNamesSize -- Adding trailing null character.
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+ fromIntegral (succ $ ByteString.length stringTable)
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, sh_offset = elfSectionsSize sectionHeaders
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, sh_name = currentNamesSize
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, sh_link = 0
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, sh_info = 0
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, sh_flags = 0
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, sh_entsize = 0
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, sh_addralign = 1
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, sh_addr = 0
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}
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addSectionHeader stringTable nextHeader
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ElfEnvironment{..} <- ElfWriter get
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liftIO $ ByteString.hPut objectHandle
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$ StringTable.encode
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$ getField @"sectionNames" objectHeaders
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pure $ fromIntegral $ Vector.length sectionHeaders
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riscv32Header :: Elf32_Half -> ElfWriter Elf32_Ehdr
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riscv32Header shstrndx = do
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ElfHeaderResult{..} <- ElfWriter $ gets $ getField @"objectHeaders"
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@ -104,76 +80,9 @@ riscv32Elf code = text
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, e_entry = 0
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, e_ehsize = fromIntegral elfHeaderSize
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}
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takeStringZ stringTable Elf32_Sym{ st_name }
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= StringTable.index st_name stringTable
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resolveRelocation (ElfHeaderResult stringTable entries) unresolvedRelocation
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| UnresolvedRelocation symbolName offset type' <- unresolvedRelocation
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, Just entry <- Vector.findIndex ((== symbolName) . takeStringZ stringTable) entries =
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Right $ Elf32_Rel
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{ r_offset = offset
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, r_info = rInfo (fromIntegral entry) type'
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}
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| otherwise = Left unresolvedRelocation
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symtab entries = do
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ElfHeaderResult{..} <- ElfWriter $ gets $ getField @"objectHeaders"
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let encodedSymbols = LazyByteString.toStrict
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$ ByteString.Builder.toLazyByteString
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$ foldMap (elf32Sym LSB) entries
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symHeader = Elf32_Shdr
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{ sh_type = SHT_SYMTAB
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, sh_size = fromIntegral $ ByteString.length encodedSymbols
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, sh_offset = elfSectionsSize sectionHeaders
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, sh_name = StringTable.size sectionNames
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, sh_link = fromIntegral $ Vector.length sectionHeaders + 2
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, sh_info = 1
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, sh_flags = 0
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, sh_entsize = 16
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, sh_addralign = 4
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, sh_addr = 0
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}
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putSectionHeader ".symtab" symHeader encodedSymbols
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pure $ fromIntegral $ Vector.length sectionHeaders
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symrel symbols relocations = do
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let UnresolvedRelocations relocationList index = relocations
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ElfHeaderResult stringTable entries = symbols
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sectionHeadersLength <- symtab entries
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ElfHeaderResult{..} <- ElfWriter $ gets $ getField @"objectHeaders"
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let encodedRelocations = LazyByteString.toStrict
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$ ByteString.Builder.toLazyByteString
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$ Vector.foldMap (either (const mempty) (elf32Rel LSB))
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$ resolveRelocation symbols <$> relocationList
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relHeader = Elf32_Shdr
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{ sh_type = SHT_REL
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, sh_size = fromIntegral $ ByteString.length encodedRelocations
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, sh_offset = elfSectionsSize sectionHeaders
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, sh_name = StringTable.size sectionNames
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, sh_link = sectionHeadersLength
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, sh_info = index
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, sh_flags = shfInfoLink
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, sh_entsize = 8
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, sh_addralign = 4
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, sh_addr = 0
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}
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putSectionHeader ".rel.text" relHeader encodedRelocations
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pure stringTable
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strtab stringTable = do
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ElfHeaderResult{..} <- ElfWriter $ gets $ getField @"objectHeaders"
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let strHeader = Elf32_Shdr
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{ sh_type = SHT_STRTAB
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, sh_size = StringTable.size stringTable
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, sh_offset = elfSectionsSize sectionHeaders
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, sh_name = StringTable.size sectionNames
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, sh_link = 0
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, sh_info = 0
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, sh_flags = 0
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, sh_entsize = 0
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, sh_addralign = 1
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, sh_addr = 0
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}
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putSectionHeader ".strtab" strHeader $ StringTable.encode stringTable
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text = do
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text :: Vector Statement -> ElfWriter UnresolvedRelocations
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text code = do
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ElfHeaderResult{..} <- ElfWriter $ gets $ getField @"objectHeaders"
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let textTabIndex = fromIntegral $ Vector.length sectionHeaders
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initialHeaders = ElfHeaderResult mempty
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@ -207,7 +116,9 @@ riscv32Elf code = text
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. (`StringTable.elem` getField @"sectionNames" symbols)
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symbolResult = HashSet.foldl' encodeEmptyDefinitions symbols
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$ HashSet.filter filterPredicate definitions
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pure (symbolResult, UnresolvedRelocations updatedRelocations $ fromIntegral $ Vector.length sectionHeaders)
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pure $ UnresolvedRelocations updatedRelocations symbolResult
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$ fromIntegral $ Vector.length sectionHeaders
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where
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encodeEmptyDefinitions (ElfHeaderResult names entries) definition =
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let nextEntry = Elf32_Sym
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{ st_value = 0
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@ -219,34 +130,36 @@ riscv32Elf code = text
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}
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in ElfHeaderResult (StringTable.append definition names)
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$ Vector.snoc entries nextEntry
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encodeFunctions shndx (encoded, relocations, ElfHeaderResult names symbols, definitions) instructions
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encodeFunctions shndx (encoded, relocations, symbolResult, definitions) instructions
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| Just (instruction, rest) <- Vector.uncons instructions =
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case instruction of
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Instruction _ ->
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let (encoded', relocations', rest', definitions') =
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encodeInstructions (encoded, relocations, instructions, definitions)
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in encodeFunctions shndx (encoded', relocations', ElfHeaderResult names symbols, definitions') rest'
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JumpLabel labelName _ ->
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let (encoded', relocations', rest', definitions') =
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encodeInstructions (encoded, relocations, rest, definitions)
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let (encoded', relocations', symbolResult', definitions', rest') =
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encodeInstructions shndx (encoded, relocations, symbolResult, definitions, instructions)
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in encodeFunctions shndx (encoded', relocations', symbolResult', definitions') rest'
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JumpLabel labelName directives ->
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let (encoded', relocations', ElfHeaderResult _names _symbols, definitions', rest') =
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encodeInstructions shndx (encoded, relocations, symbolResult, definitions, rest)
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isGlobal = GlobalDirective `elem` directives
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newEntry = Elf32_Sym
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{ st_value = fromIntegral $ LazyByteString.length encoded
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, st_size = fromIntegral $ LazyByteString.length encoded'
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, st_size = if isGlobal then fromIntegral $ LazyByteString.length encoded' else 0
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, st_shndx = shndx
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, st_other = 0
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, st_name = StringTable.size names
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, st_info = stInfo STB_GLOBAL STT_FUNC
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, st_name = StringTable.size _names
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, st_info = stInfo (if isGlobal then STB_GLOBAL else STB_LOCAL)
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$ if FunctionDirective `elem` directives then STT_FUNC else STT_NOTYPE
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}
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result =
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( encoded'
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, relocations'
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, ElfHeaderResult (StringTable.append (Text.encodeUtf8 labelName) names)
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$ Vector.snoc symbols newEntry
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, ElfHeaderResult (StringTable.append (Text.encodeUtf8 labelName) _names)
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$ Vector.snoc _symbols newEntry
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, definitions'
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)
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in encodeFunctions shndx result rest'
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| otherwise = (encoded, relocations, ElfHeaderResult names symbols, definitions)
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encodeInstructions (encoded, relocations, instructions, definitions)
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| otherwise = (encoded, relocations, symbolResult, definitions)
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encodeInstructions shndx (encoded, relocations, ElfHeaderResult names symbols, definitions, instructions)
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| Just (Instruction instruction, rest) <- Vector.uncons instructions =
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let offset = fromIntegral $ LazyByteString.length encoded
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unresolvedRelocation = case instruction of
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@ -275,11 +188,136 @@ riscv32Elf code = text
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result =
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( encoded <> chunk
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, maybe relocations (Vector.snoc relocations) unresolvedRelocation
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, rest
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, ElfHeaderResult names symbols
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, addDefinition unresolvedRelocation definitions
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, rest
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)
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in encodeInstructions result
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| otherwise = (encoded, relocations, instructions, definitions)
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in encodeInstructions shndx result
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| Just (JumpLabel labelName directives , rest) <- Vector.uncons instructions
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, FunctionDirective `notElem` directives =
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let newEntry = Elf32_Sym
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{ st_value = fromIntegral $ LazyByteString.length encoded
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, st_size = 0
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, st_shndx = shndx
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, st_other = 0
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, st_name = StringTable.size names
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, st_info = stInfo (if GlobalDirective `elem` directives then STB_GLOBAL else STB_LOCAL) STT_NOTYPE
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}
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result =
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( encoded
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, relocations
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, ElfHeaderResult (StringTable.append (Text.encodeUtf8 labelName) names)
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$ Vector.snoc symbols newEntry
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, definitions
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, rest
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)
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in encodeInstructions shndx result
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| otherwise = (encoded, relocations, ElfHeaderResult names symbols, definitions, instructions)
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addDefinition (Just (UnresolvedRelocation symbolName _ _)) =
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HashSet.insert symbolName
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addDefinition Nothing = id
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shstrtab :: ElfWriter Elf32_Half
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shstrtab = do
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ElfHeaderResult{..} <- ElfWriter $ gets $ getField @"objectHeaders"
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let stringTable = ".shstrtab"
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currentNamesSize = StringTable.size sectionNames
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nextHeader = Elf32_Shdr
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{ sh_type = SHT_STRTAB
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, sh_size = currentNamesSize -- Adding trailing null character.
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+ fromIntegral (succ $ ByteString.length stringTable)
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, sh_offset = elfSectionsSize sectionHeaders
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, sh_name = currentNamesSize
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, sh_link = 0
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, sh_info = 0
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, sh_flags = 0
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, sh_entsize = 0
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, sh_addralign = 1
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, sh_addr = 0
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}
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addSectionHeader stringTable nextHeader
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ElfEnvironment{..} <- ElfWriter get
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liftIO $ ByteString.hPut objectHandle
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$ StringTable.encode
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$ getField @"sectionNames" objectHeaders
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pure $ fromIntegral $ Vector.length sectionHeaders
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symtab :: UnresolvedRelocations -> ElfWriter (Elf32_Word, UnresolvedRelocations)
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symtab (UnresolvedRelocations relocationList symbolResult index) = do
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ElfHeaderResult{..} <- ElfWriter $ gets $ getField @"objectHeaders"
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let (localSymbols, globalSymbols) = partitionSymbols symbolResult
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sortedSymbols = localSymbols <> globalSymbols
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sortedResult = symbolResult{ sectionHeaders = sortedSymbols }
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encodedSymbols = LazyByteString.toStrict
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$ ByteString.Builder.toLazyByteString
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$ foldMap (elf32Sym LSB) sortedSymbols
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symHeader = Elf32_Shdr
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{ sh_type = SHT_SYMTAB
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, sh_size = fromIntegral $ ByteString.length encodedSymbols
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, sh_offset = elfSectionsSize sectionHeaders
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, sh_name = StringTable.size sectionNames
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, sh_link = fromIntegral $ Vector.length sectionHeaders + 2
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, sh_info = fromIntegral $ Vector.length localSymbols
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, sh_flags = 0
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, sh_entsize = 16
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, sh_addralign = 4
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, sh_addr = 0
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}
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putSectionHeader ".symtab" symHeader encodedSymbols
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pure
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( fromIntegral $ Vector.length sectionHeaders
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, UnresolvedRelocations relocationList sortedResult index
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)
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symrel :: Elf32_Word -> UnresolvedRelocations -> ElfWriter StringTable
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symrel sectionHeadersLength relocations = do
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ElfHeaderResult{..} <- ElfWriter $ gets $ getField @"objectHeaders"
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let UnresolvedRelocations relocationList symbols index = relocations
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encodedRelocations = LazyByteString.toStrict
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$ ByteString.Builder.toLazyByteString
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$ Vector.foldMap (either (const mempty) (elf32Rel LSB))
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$ resolveRelocation symbols <$> relocationList
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relHeader = Elf32_Shdr
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{ sh_type = SHT_REL
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, sh_size = fromIntegral $ ByteString.length encodedRelocations
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, sh_offset = elfSectionsSize sectionHeaders
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, sh_name = StringTable.size sectionNames
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, sh_link = sectionHeadersLength
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, sh_info = index
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, sh_flags = shfInfoLink
|
||||
, sh_entsize = 8
|
||||
, sh_addralign = 4
|
||||
, sh_addr = 0
|
||||
}
|
||||
putSectionHeader ".rel.text" relHeader encodedRelocations
|
||||
pure $ getField @"sectionNames" symbols
|
||||
where
|
||||
takeStringZ stringTable Elf32_Sym{ st_name }
|
||||
= StringTable.index st_name stringTable
|
||||
resolveRelocation (ElfHeaderResult stringTable entries) unresolvedRelocation
|
||||
| UnresolvedRelocation symbolName offset type' <- unresolvedRelocation
|
||||
, Just entry <- Vector.findIndex ((== symbolName) . takeStringZ stringTable) entries =
|
||||
Right $ Elf32_Rel
|
||||
{ r_offset = offset
|
||||
, r_info = rInfo (fromIntegral entry) type'
|
||||
}
|
||||
| otherwise = Left unresolvedRelocation
|
||||
|
||||
strtab :: StringTable -> ElfWriter ()
|
||||
strtab stringTable = do
|
||||
ElfHeaderResult{..} <- ElfWriter $ gets $ getField @"objectHeaders"
|
||||
let strHeader = Elf32_Shdr
|
||||
{ sh_type = SHT_STRTAB
|
||||
, sh_size = StringTable.size stringTable
|
||||
, sh_offset = elfSectionsSize sectionHeaders
|
||||
, sh_name = StringTable.size sectionNames
|
||||
, sh_link = 0
|
||||
, sh_info = 0
|
||||
, sh_flags = 0
|
||||
, sh_entsize = 0
|
||||
, sh_addralign = 1
|
||||
, sh_addr = 0
|
||||
}
|
||||
putSectionHeader ".strtab" strHeader $ StringTable.encode stringTable
|
||||
|
||||
Loading…
Reference in New Issue
Block a user