From 819909d2bc253ed1630880f82276176432b17803 Mon Sep 17 00:00:00 2001
From: "pho@cielonegro.org" <unknown>
Date: Tue, 30 Nov 2010 12:14:25 +0000
Subject: [PATCH] rts/Linker.c (ocFlushInstructionCache):

I found this function causes a segfault when ocAllocateSymbolExtras() has allocated a separate memory region for jump islands.
---
 rts/Linker.c |   17 ++++++++++++-----
 1 file changed, 12 insertions(+), 5 deletions(-)

diff --git a/rts/Linker.c b/rts/Linker.c
index c92ede5..5f8ce13 100644
--- a/rts/Linker.c
+++ b/rts/Linker.c
@@ -2393,13 +2393,12 @@ static SymbolExtra* makeSymbolExtra( ObjectCode* oc,
    Because the PPC has split data/instruction caches, we have to
    do that whenever we modify code at runtime.
  */
-
-static void ocFlushInstructionCache( ObjectCode *oc )
+static void ocFlushInstructionCacheFrom(void* begin, size_t length)
 {
-    int n = (oc->fileSize + sizeof( SymbolExtra ) * oc->n_symbol_extras + 3) / 4;
-    unsigned long *p = (unsigned long *) oc->image;
+    size_t         n = (length + 3) / 4;
+    unsigned long* p = begin;
 
-    while( n-- )
+    while (n--)
     {
         __asm__ volatile ( "dcbf 0,%0\n\t"
                            "sync\n\t"
@@ -2413,6 +2412,14 @@ static void ocFlushInstructionCache( ObjectCode *oc )
                        "isync"
                      );
 }
+static void ocFlushInstructionCache( ObjectCode *oc )
+{
+    /* The main object code */
+    ocFlushInstructionCacheFrom(oc->image + oc->misalignment, oc->fileSize);
+
+    /* Jump Islands */
+    ocFlushInstructionCacheFrom(oc->symbol_extras, sizeof(SymbolExtra) * oc->n_symbol_extras);
+}
 #endif
 
 /* --------------------------------------------------------------------------
-- 
1.7.10.4