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https://bugzilla.mozilla.org/show_bug.cgi?id=589735
--- a/js/src/jsgcchunk.cpp 2011-03-31 21:08:36.000000000 +0200
+++ b/js/src/jsgcchunk.cpp 2012-11-02 10:36:08.324453878 +0100
@@ -318,15 +318,48 @@
static void *
MapPages(void *addr, size_t size)
{
+#if defined(__ia64__)
+ /*
+ * The JS engine assumes that all allocated pointers have their high 17 bits clear,
+ * which ia64's mmap doesn't support directly. However, we can emulate it by passing
+ * mmap an "addr" parameter with those bits clear. The mmap will return that address,
+ * or the nearest available memory above that address, providing a near-guarantee
+ * that those bits are clear. If they are not, we return NULL below to indicate
+ * out-of-memory.
+ *
+ * The addr is chosen as 0x0000070000000000, which still allows about 120TB of virtual
+ * address space.
+ *
+ * See Bug 589735 for more information.
+ */
+#endif
+
/*
* We don't use MAP_FIXED here, because it can cause the *replacement*
* of existing mappings, and we only want to create new mappings.
*/
+#if defined(__ia64__)
+ void *p = mmap(addr ? addr : (void*)0x0000070000000000,
+ size, PROT_READ | PROT_WRITE, MAP_PRIVATE | MAP_ANON,
+ -1, 0);
+#else
void *p = mmap(addr, size, PROT_READ | PROT_WRITE, MAP_PRIVATE | MAP_ANON,
-1, 0);
+#endif
if (p == MAP_FAILED)
return NULL;
+#if defined(__ia64__)
+ /*
+ * If the caller requested a specific memory location, verify that's what mmap returned.
+ * Otherwise: If the allocated memory doesn't have its upper 17 bits clear, consider it
+ * as out of memory.
+ */
+ if (addr && p != addr
+ || !addr && ((long long)p & 0xffff800000000000)) {
+#else
+ /* If the caller requested a specific memory location, verify that's what mmap returned. */
if (addr && p != addr) {
+#endif
/* We succeeded in mapping memory, but not in the right place. */
JS_ALWAYS_TRUE(munmap(p, size) == 0);
return NULL;
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