X-Git-Url: http://git.megacz.com/?a=blobdiff_plain;f=compiler%2FnativeGen%2FMachCodeGen.hs;h=7108c480bfdb2b910fc10b75db3cb040833af6af;hb=6a05ec5ef5373f61b7f9f5bdc344483417fa801b;hp=65300a76cd17708df4f8310821e524e0b278aa6c;hpb=fd8d04119e849f9c713d3e697228846d93c5ca69;p=ghc-hetmet.git

diff --git a/compiler/nativeGen/MachCodeGen.hs b/compiler/nativeGen/MachCodeGen.hs
index 65300a7..7108c48 100644
--- a/compiler/nativeGen/MachCodeGen.hs
+++ b/compiler/nativeGen/MachCodeGen.hs
@@ -1,3 +1,10 @@
+{-# OPTIONS -w #-}
+-- The above warning supression flag is a temporary kludge.
+-- While working on this module you are encouraged to remove it and fix
+-- any warnings in the module. See
+--     http://hackage.haskell.org/trac/ghc/wiki/Commentary/CodingStyle#Warnings
+-- for details
+
 -----------------------------------------------------------------------------
 --
 -- Generating machine code (instruction selection)
@@ -11,13 +18,6 @@
 -- (c) the #if blah_TARGET_ARCH} things, the
 -- structure should not be too overwhelming.
 
-{-# OPTIONS -w #-}
--- The above warning supression flag is a temporary kludge.
--- While working on this module you are encouraged to remove it and fix
--- any warnings in the module. See
---     http://hackage.haskell.org/trac/ghc/wiki/Commentary/CodingStyle#Warnings
--- for details
-
 module MachCodeGen ( cmmTopCodeGen, InstrBlock ) where
 
 #include "HsVersions.h"
@@ -3896,7 +3896,8 @@ genSwitch expr ids
             op = OpAddr (AddrBaseIndex (EABaseReg tableReg)
                                        (EAIndex reg wORD_SIZE) (ImmInt 0))
 
-#if x86_64_TARGET_ARCH && darwin_TARGET_OS
+#if x86_64_TARGET_ARCH
+#if darwin_TARGET_OS
     -- on Mac OS X/x86_64, put the jump table in the text section
     -- to work around a limitation of the linker.
     -- ld64 is unable to handle the relocations for
@@ -3909,6 +3910,23 @@ genSwitch expr ids
                             LDATA Text (CmmDataLabel lbl : jumpTable)
                     ]
 #else
+    -- HACK: On x86_64 binutils<2.17 is only able to generate PC32
+    -- relocations, hence we only get 32-bit offsets in the jump
+    -- table. As these offsets are always negative we need to properly
+    -- sign extend them to 64-bit. This hack should be removed in
+    -- conjunction with the hack in PprMach.hs/pprDataItem once
+    -- binutils 2.17 is standard.
+            code = e_code `appOL` t_code `appOL` toOL [
+			    LDATA ReadOnlyData (CmmDataLabel lbl : jumpTable),
+			    MOVSxL I32
+				   (OpAddr (AddrBaseIndex (EABaseReg tableReg)
+							  (EAIndex reg wORD_SIZE) (ImmInt 0)))
+				   (OpReg reg),
+			    ADD wordRep (OpReg reg) (OpReg tableReg),
+			    JMP_TBL (OpReg tableReg) [ id | Just id <- ids ]
+		   ]
+#endif
+#else
             code = e_code `appOL` t_code `appOL` toOL [
                             LDATA ReadOnlyData (CmmDataLabel lbl : jumpTable),
                             ADD wordRep op (OpReg tableReg),