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