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Diffstat (limited to 'src/Native/System.Private.TypeLoader.Native/arm64/ConstrainedCallSupportHelpers.asm')
| -rw-r--r-- | src/Native/System.Private.TypeLoader.Native/arm64/ConstrainedCallSupportHelpers.asm | 67 |
1 files changed, 67 insertions, 0 deletions
diff --git a/src/Native/System.Private.TypeLoader.Native/arm64/ConstrainedCallSupportHelpers.asm b/src/Native/System.Private.TypeLoader.Native/arm64/ConstrainedCallSupportHelpers.asm new file mode 100644 index 000000000..f38b392c4 --- /dev/null +++ b/src/Native/System.Private.TypeLoader.Native/arm64/ConstrainedCallSupportHelpers.asm @@ -0,0 +1,67 @@ +;; Licensed to the .NET Foundation under one or more agreements. +;; The .NET Foundation licenses this file to you under the MIT license. +;; See the LICENSE file in the project root for more information. + +#include "ksarm64.h" + +;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;; DATA SECTIONS ;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;; +POINTER_SIZE equ 0x08 + + +;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;; ConstrainedCall Support Helpers ;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;; + +;; +;; Note: The "__jmpstub__" prefix is used to indicate to debugger +;; that it must step-through this stub when it encounters it while +;; stepping. +;; +;; INPUT: xip0: AddressOfAddressOfFunctionToCallAfterDereferencingThis +;; + LEAF_ENTRY __jmpstub__ConstrainedCallSupport_DerefThisAndCall_CommonCallingStub + ldr x12, [xip0] ; Load tail jump target + ldr x0, [x0] ; Dereference this to get real function pointer + ret x12 + LEAF_END __jmpstub__ConstrainedCallSupport_DerefThisAndCall_CommonCallingStub + +;; +;; void ConstrainedCallSupport_GetStubs(IntPtr *__jmpstub__ConstrainedCallSupport_DerefThisAndCall_CommonCallingStub, +;; IntPtr *__jmpstub__ConstrainedCallSupport_DirectConstrainedCallCommonStub) +;; + LEAF_ENTRY ConstrainedCallSupport_GetStubs + ldr x12, =__jmpstub__ConstrainedCallSupport_DerefThisAndCall_CommonCallingStub + str x12, [x0] + ldr x12, =__jmpstub__ConstrainedCallSupport_DirectConstrainedCallCommonStub + str x12, [x1] + ret + LEAF_END ConstrainedCallSupport_GetStubs + +;; +;; __jmpstub__ConstrainedCallSupport_DirectConstrainedCallCommonStub +;; +;; struct ConstrainedCallDesc +;; { +;; ULONG_PTR ExactTarget; +;; ULONG_PTR LookupFunc; // Put UniversalThunk here +;; } +;; +;; struct CommonCallingStubInputData +;; { +;; ULONG_PTR ConstrainedCallDesc; +;; ULONG_PTR DirectConstrainedCallResolver; +;; } +;; +;; INPUT: xip0: Points at CommonCallingStubInputData +;; +;; + LEAF_ENTRY __jmpstub__ConstrainedCallSupport_DirectConstrainedCallCommonStub + ldr xip1, [xip0] ; put ConstrainedCallDesc into xip1 (Arg to LookupFunc/Temp for getting ExactTarget) + ldr x12, [xip1] ; put ExactTarget into x12 + cbnz x12, JumpToTarget ; compare against null + ; If we reach here, we need to use a universal thunk to call the LookupFunc + ldr x12, [xip1, #POINTER_SIZE] ; Get Universal thunk function pointer into x12 + ldr xip0, [xip0, #POINTER_SIZE] ; Put DirectConstrainedCallResolver into xip0 for UniversalTransitionThunk call +JumpToTarget + ret x12 + LEAF_END __jmpstub__ConstrainedCallSupport_DirectConstrainedCallCommonStub + + END |