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Lines 318-332
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static void * |
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static void * |
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MapPages(void *addr, size_t size) |
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MapPages(void *addr, size_t size) |
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{ |
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{ |
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#if defined(__ia64__) |
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/* |
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* The JS engine assumes that all allocated pointers have their high 17 bits clear, |
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* which ia64's mmap doesn't support directly. However, we can emulate it by passing |
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* mmap an "addr" parameter with those bits clear. The mmap will return that address, |
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* or the nearest available memory above that address, providing a near-guarantee |
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* that those bits are clear. If they are not, we return NULL below to indicate |
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* out-of-memory. |
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* |
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* The addr is chosen as 0x0000070000000000, which still allows about 120TB of virtual |
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* address space. |
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* |
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* See Bug 589735 for more information. |
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*/ |
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#endif |
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/* |
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/* |
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* We don't use MAP_FIXED here, because it can cause the *replacement* |
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* We don't use MAP_FIXED here, because it can cause the *replacement* |
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* of existing mappings, and we only want to create new mappings. |
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* of existing mappings, and we only want to create new mappings. |
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*/ |
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*/ |
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#if defined(__ia64__) |
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void *p = mmap(addr ? addr : (void*)0x0000070000000000, |
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size, PROT_READ | PROT_WRITE, MAP_PRIVATE | MAP_ANON, |
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-1, 0); |
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#else |
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void *p = mmap(addr, size, PROT_READ | PROT_WRITE, MAP_PRIVATE | MAP_ANON, |
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void *p = mmap(addr, size, PROT_READ | PROT_WRITE, MAP_PRIVATE | MAP_ANON, |
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-1, 0); |
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-1, 0); |
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#endif |
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if (p == MAP_FAILED) |
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if (p == MAP_FAILED) |
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return NULL; |
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return NULL; |
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#if defined(__ia64__) |
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/* |
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* If the caller requested a specific memory location, verify that's what mmap returned. |
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* Otherwise: If the allocated memory doesn't have its upper 17 bits clear, consider it |
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* as out of memory. |
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*/ |
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if (addr && p != addr |
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|| !addr && ((long long)p & 0xffff800000000000)) { |
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#else |
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/* If the caller requested a specific memory location, verify that's what mmap returned. */ |
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if (addr && p != addr) { |
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if (addr && p != addr) { |
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#endif |
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/* We succeeded in mapping memory, but not in the right place. */ |
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/* We succeeded in mapping memory, but not in the right place. */ |
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JS_ALWAYS_TRUE(munmap(p, size) == 0); |
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JS_ALWAYS_TRUE(munmap(p, size) == 0); |
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return NULL; |
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return NULL; |
