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| author | Jiaxun Yang <jiaxun.yang@flygoat.com> | 2020-05-12 12:40:06 +0800 |
|---|---|---|
| committer | Jiaxun Yang <jiaxun.yang@flygoat.com> | 2020-05-14 16:31:56 +0800 |
| commit | 22a4c154bbfb2b293c15be4fad8fe55a668c90ec (patch) | |
| tree | 8665eab69bac69e98ee1c3e247c5d410a7541a8b | |
| parent | 001c41612562bf88ea738dfc0476ab6a50f9d106 (diff) | |
| download | uxp-22a4c154bbfb2b293c15be4fad8fe55a668c90ec.tar.gz | |
Bug 1271968 - IonMonkey: MIPS: Make jit code in same 256 MB-aligned region
Tag: #1542
| -rw-r--r-- | js/src/jit/ProcessExecutableMemory.cpp | 16 |
1 files changed, 16 insertions, 0 deletions
diff --git a/js/src/jit/ProcessExecutableMemory.cpp b/js/src/jit/ProcessExecutableMemory.cpp index 71c2ab0dce..1ba5c4aaed 100644 --- a/js/src/jit/ProcessExecutableMemory.cpp +++ b/js/src/jit/ProcessExecutableMemory.cpp @@ -589,7 +589,23 @@ static ProcessExecutableMemory execMemory; void* js::jit::AllocateExecutableMemory(size_t bytes, ProtectionSetting protection) { +#if defined(JS_CODEGEN_MIPS32) || defined(JS_CODEGEN_MIPS64) + // On MIPS, j/jal instructions to branch within the current + // 256 MB-aligned region. + void* allocation = nullptr; + js::Vector<void*, 8, SystemAllocPolicy> unused_maps; + for (;;) { + allocation = execMemory.allocate(bytes, protection); + if ((uintptr_t(allocation) >> 28) == (uintptr_t(allocation + bytes) >> 28)) + break; + unused_maps.append(allocation); + } + for (size_t i = 0; i < unused_maps.length(); i++) + DeallocateExecutableMemory(unused_maps[i], bytes); + return allocation; +#else return execMemory.allocate(bytes, protection); +#endif } void |