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* JIT/AArch64: [macos][ZTS] Support fast path for tlv_get_addr Access to TLV(thread local variable) in macOS is in "dynamic" form and function tlv_get_addr() is invoked to resolve the address. See the example in [1]. Note there is one struct TLVDescriptor [2] for each TLV. The first member holds the address of function tlv_get_addr(), and the other two members, "key" and "offset", would be used inside tlv_get_addr(). The disassembly code for function tlv_get_addr() is shown in [3]. With the value from system register, i.e. tpidrro_el0, together with "key" and "offset", the TLV address can be obtained. Note that the value from tpidrro_el0 varies for different threads, and unique address for TLV is resolved. It's worth noting that slow path would be executed, i.e. function tlv_allocate_and_initialize_for_key(), for the first time of TLV access. In this patch: 1. "_tsrm_ls_cache" is guaranteed to be accessed before any VM/JIT code during the request startup, e.g. in init_executor(), therefore, slow path can be avoided. 2. As TLVDecriptor is immutable and zend_jit_setup() executes once, we get this structure in tsrm_get_ls_cache_tcb_offset(). Note the 'ldr' instruction would be patched to 'add' by the linker. 3. Only fast path for tlv_get_addr() is implemented in macro LOAD_TSRM_CACHE. With this patch, all ~4k test cases can pass for ZTS+CALL in macOS on Apple silicon. [1] https://gist.github.com/shqking/4aab67e0105f7c1f2c549d57d5799f94 [2] https://opensource.apple.com/source/dyld/dyld-195.6/src/threadLocalVariables.c.auto.html [3] https://gist.github.com/shqking/329d7712c26bad49786ab0a544a4af43 Change-Id: I613e9c37e3ff2ecc3fab0f53f1e48a0246e12ee3 |
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| .. | ||
| config.w32 | ||
| LICENSE | ||
| threads.m4 | ||
| tsrm_win32.c | ||
| tsrm_win32.h | ||
| TSRM.c | ||
| TSRM.h | ||
| tsrm.m4 | ||