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1a1a83f1fc
On win64, xmm6-xmm15 are preserved registers, but the prologues and epilogues of JITted code don't handle these. The issue occurs when calling into the JIT code again via an internal handler (like call_user_func). Therefore, we want to save/restore xmm registers upon entering/leaving execute_ex. Since MSVC x64 does not support inline assembly, we create an assembly wrapper around the real execute_ex function. The alternative is to always save/restore these xmm registers into the fixed call frame, but this causes unnecessary overhead. The same issue occurs for ARM64 platforms for floating point register 8 to 15. However, there we can use inline asm to fix this. Closes GH-18352.
43 lines
1.4 KiB
NASM
43 lines
1.4 KiB
NASM
.code
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; ZEND_API void execute_ex(zend_execute_data *ex)
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PUBLIC execute_ex
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EXTERN execute_ex_real:PROC
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; Assembly wrapper around the real execute_ex function, so that we can
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; save the preserved registers when re-entering the VM from JIT code.
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; See GH-18136.
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execute_ex PROC EXPORT FRAME
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; 10 floating points numbers
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; 32 bytes shadow space
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; 8 bytes to align after the return address
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sub rsp, 8*10 + 32 + 8
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.allocstack 8*10 + 32 + 8
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.endprolog
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movsd qword ptr [rsp + 32 + 8*0], xmm6
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movsd qword ptr [rsp + 32 + 8*1], xmm7
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movsd qword ptr [rsp + 32 + 8*2], xmm8
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movsd qword ptr [rsp + 32 + 8*3], xmm9
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movsd qword ptr [rsp + 32 + 8*4], xmm10
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movsd qword ptr [rsp + 32 + 8*5], xmm11
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movsd qword ptr [rsp + 32 + 8*6], xmm12
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movsd qword ptr [rsp + 32 + 8*7], xmm13
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movsd qword ptr [rsp + 32 + 8*8], xmm14
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movsd qword ptr [rsp + 32 + 8*9], xmm15
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call execute_ex_real
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movsd xmm6, qword ptr [rsp + 32 + 8*0]
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movsd xmm7, qword ptr [rsp + 32 + 8*1]
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movsd xmm8, qword ptr [rsp + 32 + 8*2]
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movsd xmm9, qword ptr [rsp + 32 + 8*3]
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movsd xmm10, qword ptr [rsp + 32 + 8*4]
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movsd xmm11, qword ptr [rsp + 32 + 8*5]
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movsd xmm12, qword ptr [rsp + 32 + 8*6]
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movsd xmm13, qword ptr [rsp + 32 + 8*7]
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movsd xmm14, qword ptr [rsp + 32 + 8*8]
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movsd xmm15, qword ptr [rsp + 32 + 8*9]
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add rsp, 8*10 + 32 + 8
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ret
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execute_ex ENDP
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END
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