PKGBUILDs/extra/js/mozjs24-48-bit-VA-fix.patch
2016-10-13 00:18:03 +00:00

57 lines
2.2 KiB
Diff

From c3ef56fa3239d9133be922059300a6fd2e7c1435 Mon Sep 17 00:00:00 2001
From: Zheng Xu <zheng.xu@linaro.org>
Date: Wed, 17 Aug 2016 11:59:15 +0800
Subject: [PATCH] Bug 1143022 - Manually mmap on arm64 to ensure high 17 bits are clear. r=ehoogeveen
There might be 48-bit VA on arm64 depending on kernel configuration.
Manually mmap heap memory to align with the assumption made by JS engine.
Change-Id: Ic5d2b2fe4b758b3c87cc0688348af7e71a991146
---
diff --git a/js/src/gc/Memory.cpp b/js/src/gc/Memory.cpp
index 153ccb4..b2d1311 100644
--- a/js/src/gc/Memory.cpp
+++ b/js/src/gc/Memory.cpp
@@ -339,6 +339,41 @@
return MAP_FAILED;
}
return region;
+#elif defined(__aarch64__)
+ /*
+ * There might be similar virtual address issue on arm64 which depends on
+ * hardware and kernel configurations. But the work around is slightly
+ * different due to the different mmap behavior.
+ *
+ * TODO: Merge with the above code block if this implementation works for
+ * ia64 and sparc64.
+ */
+ const uintptr_t start = (uintptr_t)(0x0000070000000000UL);
+ const uintptr_t end = (uintptr_t)(0x0000800000000000UL);
+ const uintptr_t step = ChunkSize;
+ /*
+ * Optimization options if there are too many retries in practice:
+ * 1. Examine /proc/self/maps to find an available address. This file is
+ * not always available, however. In addition, even if we examine
+ * /proc/self/maps, we may still need to retry several times due to
+ * racing with other threads.
+ * 2. Use a global/static variable with lock to track the addresses we have
+ * allocated or tried.
+ */
+ uintptr_t hint;
+ void* region = MAP_FAILED;
+ for (hint = start; region == MAP_FAILED && hint + length <= end; hint += step) {
+ region = mmap((void*)hint, length, prot, flags, fd, offset);
+ if (region != MAP_FAILED) {
+ if ((uintptr_t(region) + (length - 1)) & 0xffff800000000000) {
+ if (munmap(region, length)) {
+ MOZ_ASSERT(errno == ENOMEM);
+ }
+ region = MAP_FAILED;
+ }
+ }
+ }
+ return region == MAP_FAILED ? nullptr : region;
#else
return mmap(NULL, length, prot, flags, fd, offset);
#endif