From 130f6b84e3cdd09ded40585bfa3525373a666918 Mon Sep 17 00:00:00 2001 From: sewardj Date: Mon, 20 Aug 2001 13:43:18 +0000 Subject: [PATCH] [project @ 2001-08-20 13:43:18 by sewardj] I have braved the insanity of the Sparc calling conventions and lived to tell the tale. This commit adds support for foreign import {static,dynamic} for Sparc in GHCi. --- ghc/compiler/ghci/ByteCodeFFI.lhs | 211 +++++++++++++++++++++++++++++++++++-- 1 file changed, 202 insertions(+), 9 deletions(-) diff --git a/ghc/compiler/ghci/ByteCodeFFI.lhs b/ghc/compiler/ghci/ByteCodeFFI.lhs index 8331bf4..bcfee9d 100644 --- a/ghc/compiler/ghci/ByteCodeFFI.lhs +++ b/ghc/compiler/ghci/ByteCodeFFI.lhs @@ -1,7 +1,7 @@ % -% (c) The University of Glasgow 2000 +% (c) The University of Glasgow 2001 % -\section[ByteCodeGen]{Generate bytecode from Core} +\section[ByteCodeGen]{Generate machine-code sequences for foreign import} \begin{code} module ByteCodeFFI ( taggedSizeW, untaggedSizeW, mkMarshalCode ) where @@ -11,7 +11,11 @@ module ByteCodeFFI ( taggedSizeW, untaggedSizeW, mkMarshalCode ) where import Outputable import PrimRep ( PrimRep(..), getPrimRepSize, isFollowableRep ) import ForeignCall ( CCallConv(..) ) -import Bits ( Bits(..), shiftR ) + +-- DON'T remove apparently unused imports here .. there is ifdeffery +-- below +import Bits ( Bits(..), shiftR, shiftL ) + import Word ( Word8, Word32 ) import Addr ( Addr(..), writeWord8OffAddr ) import Foreign ( Ptr(..), mallocBytes ) @@ -96,10 +100,10 @@ mkMarshalCode_wrk :: CCallConv -> (Int, PrimRep) -> Int -> [(Int, PrimRep)] -> [Word8] -#if i386_TARGET_ARCH - mkMarshalCode_wrk cconv (r_offW, r_rep) addr_offW arg_offs_n_reps +#if i386_TARGET_ARCH + = let -- Don't change this without first consulting Intel Corp :-) bytes_per_word = 4 @@ -112,9 +116,11 @@ mkMarshalCode_wrk cconv (r_offW, r_rep) addr_offW arg_offs_n_reps [ let -- where this arg's bits start a_bits_offW = a_offW + sizeOfTagW a_rep in + -- reversed because x86 is little-endian reverse [a_bits_offW .. a_bits_offW + untaggedSizeW a_rep - 1] + -- reversed because args are pushed L -> R onto C stack | (a_offW, a_rep) <- reverse arg_offs_n_reps ] @@ -257,7 +263,8 @@ mkMarshalCode_wrk cconv (r_offW, r_rep) addr_offW arg_offs_n_reps DoubleRep -> fstpl_offesimem 4 FloatRep -> fstps_offesimem 4 VoidRep -> [] - other -> pprPanic "ByteCodeFFI.mkMarshalCode_wrk(x86)" (ppr r_rep) + other -> pprPanic "ByteCodeFFI.mkMarshalCode_wrk(x86)" + (ppr r_rep) {- Restore all the pushed regs and go home. @@ -275,11 +282,197 @@ mkMarshalCode_wrk cconv (r_offW, r_rep) addr_offW arg_offs_n_reps ++ ret ) -#else /* i386_TARGET_ARCH */ +#elif sparc_TARGET_ARCH + + = let -- At least for sparc V8 + bytes_per_word = 4 + + -- speaks for itself + w32_to_w8s_bigEndian :: Word32 -> [Word8] + w32_to_w8s_bigEndian w + = [fromIntegral (0xFF .&. (w `shiftR` 24)), + fromIntegral (0xFF .&. (w `shiftR` 16)), + fromIntegral (0xFF .&. (w `shiftR` 8)), + fromIntegral (0xFF .&. w)] + + -- addr and result bits offsetsW + offset_of_addr_bitsW = addr_offW + sizeOfTagW AddrRep + offset_of_res_bitsW = r_offW + sizeOfTagW r_rep + + offsets_to_pushW + = concat + [ let -- where this arg's bits start + a_bits_offW = a_offW + sizeOfTagW a_rep + in + [a_bits_offW .. a_bits_offW + untaggedSizeW a_rep - 1] + + | (a_offW, a_rep) <- arg_offs_n_reps + ] + + total_argWs = length offsets_to_pushW + argWs_on_stack = if total_argWs > 6 then total_argWs - 6 + else 0 + + -- The stack pointer must be kept 8-byte aligned, which means + -- we need to calculate this quantity too + argWs_on_stack_ROUNDED_UP + | odd argWs_on_stack = 1 + argWs_on_stack + | otherwise = argWs_on_stack + + -- some helpers to assemble sparc insns. + -- REGS + iReg, oReg, gReg, fReg :: Int -> Word32 + iReg = fromIntegral . (+ 24) + oReg = fromIntegral . (+ 8) + gReg = fromIntegral . (+ 0) + fReg = fromIntegral + + sp = oReg 6 + i0 = iReg 0 + i7 = iReg 7 + o0 = oReg 0 + o1 = oReg 1 + o7 = oReg 7 + g0 = gReg 0 + g1 = gReg 1 + f0 = fReg 0 + f1 = fReg 1 + + -- INSN templates + insn_r_r_i :: Word32 -> Word32 -> Word32 -> Int -> Word32 + insn_r_r_i op3 rs1 rd imm13 + = (3 `shiftL` 30) + .|. (rs1 `shiftL` 25) + .|. (op3 `shiftL` 19) + .|. (rd `shiftL` 14) + .|. (1 `shiftL` 13) + .|. mkSimm13 imm13 + + insn_r_i_r :: Word32 -> Word32 -> Int -> Word32 -> Word32 + insn_r_i_r op3 rs1 imm13 rd + = (2 `shiftL` 30) + .|. (rd `shiftL` 25) + .|. (op3 `shiftL` 19) + .|. (rs1 `shiftL` 14) + .|. (1 `shiftL` 13) + .|. mkSimm13 imm13 + + mkSimm13 :: Int -> Word32 + mkSimm13 imm13 + = let imm13w = (fromIntegral imm13) :: Word32 + in imm13w .&. 0x1FFF + + -- REAL (non-synthetic) insns + -- or %rs1, %rs2, %rd + mkOR :: Word32 -> Word32 -> Word32 -> Word32 + mkOR rs1 rs2 rd + = (2 `shiftL` 30) + .|. (rd `shiftL` 25) + .|. (op3_OR `shiftL` 19) + .|. (rs1 `shiftL` 14) + .|. (0 `shiftL` 13) + .|. rs2 + where op3_OR = 2 :: Word32 + + -- ld(int) [%rs + imm13], %rd + mkLD rs1 imm13 rd = insn_r_r_i 0x00{-op3_LD-} rd rs1 imm13 + + -- st(int) %rs, [%rd + imm13] + mkST = insn_r_r_i 0x04 -- op3_ST + + -- st(float) %rs, [%rd + imm13] + mkSTF = insn_r_r_i 0x24 -- op3_STF + + -- jmpl %rs + imm13, %rd + mkJMPL = insn_r_i_r 0x38 -- op3_JMPL + + -- save %rs + imm13, %rd + mkSAVE = insn_r_i_r 0x3C -- op3_SAVE + + -- restore %rs + imm13, %rd + mkRESTORE = insn_r_i_r 0x3D -- op3_RESTORE + + -- SYNTHETIC insns + mkNOP = mkOR g0 g0 g0 + mkCALL reg = mkJMPL reg 0 o7 + mkRET = mkJMPL i7 8 g0 + mkRESTORE_TRIVIAL = mkRESTORE g0 0 g0 + in + --trace (show (map fst arg_offs_n_reps)) + concatMap w32_to_w8s_bigEndian ( + + {- On entry, %o0 is the arg passed from the interpreter. After + the initial save insn, it will be in %i0. Studying the sparc + docs one would have thought that the minimum frame size is 92 + bytes, but gcc always uses at least 112, and indeed there are + segfaults a-plenty with 92. So I use 112 here as well. I + don't understand why, tho. + -} + [mkSAVE sp (- ({-92-}112 + 4*argWs_on_stack_ROUNDED_UP)) sp] + + {- For each arg in args_offs_n_reps, examine the associated PrimRep + to determine how many payload (non-tag) words there are, and + whether or not there is a tag. This gives a bunch of offsets on + the H stack. Move the first 6 words into %o0 .. %o5 and the + rest on the stack, starting at [%sp+92]. Use %g1 as a temp. + -} + ++ let doArgW (offW, wordNo) + | wordNo < 6 + = [mkLD i0 (bytes_per_word * offW) (oReg wordNo)] + | otherwise + = [mkLD i0 (bytes_per_word * offW) g1, + mkST g1 sp (92 + bytes_per_word * (wordNo - 6))] + in + concatMap doArgW (zip offsets_to_pushW [0 ..]) + + {- Get the addr to call into %g1, bearing in mind that there's + an Addr# tag at the indicated location, and do the call: + + ld [4*(1 /*tag*/ +addr_offW) + %i0], %g1 + call %g1 + -} + ++ [mkLD i0 (bytes_per_word * offset_of_addr_bitsW) g1, + mkCALL g1, + mkNOP] + + {- Depending on what the return type is, get the result + from %o0 or %o1:%o0 or %f0 or %f1:%f0. + + st %o0, [%i0 + 4] -- 32 bit int + or + st %o0, [%i0 + 4] -- 64 bit int + st %o1, [%i0 + 8] -- or the other way round? + or + st %f0, [%i0 + 4] -- 32 bit float + or + st %f0, [%i0 + 4] -- 64 bit float + st %f1, [%i0 + 8] -- or the other way round? + + -} + ++ let i32 = [mkST o0 i0 4] + i64 = [mkST o0 i0 4, mkST o1 i0 8] + f32 = [mkSTF f0 i0 4] + f64 = [mkSTF f0 i0 4, mkSTF f1 i0 8] + in + case r_rep of + IntRep -> i32 + WordRep -> i32 + AddrRep -> i32 + DoubleRep -> f64 + FloatRep -> f32 + VoidRep -> [] + other -> pprPanic "ByteCodeFFI.mkMarshalCode_wrk(sparc)" + (ppr r_rep) + + ++ [mkRET, + mkRESTORE_TRIVIAL] -- this is in the delay slot of the RET + ) + +#else -mkMarshalCode_wrk = undefined + = undefined -#endif /* i386_TARGET_ARCH */ +#endif \end{code} -- 1.7.10.4