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; 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 <AsmMacros.inc>
include AsmConstants.inc
extern s_pStubHelperFrameVPtr:qword
extern JIT_FailFast:proc
extern s_gsCookie:qword
OFFSETOF_SECRET_PARAMS equ 0h
OFFSETOF_GSCOOKIE equ OFFSETOF_SECRET_PARAMS + \
18h + 8h ; +8 for stack alignment padding
OFFSETOF_FRAME equ OFFSETOF_GSCOOKIE + \
8h
OFFSETOF_FRAME_REGISTERS equ OFFSETOF_FRAME + \
SIZEOF__Frame
SIZEOF_FIXED_FRAME equ OFFSETOF_FRAME_REGISTERS + \
SIZEOF_CalleeSavedRegisters + 8h ; +8 for return address
.errnz SIZEOF_FIXED_FRAME mod 16, SIZEOF_FIXED_FRAME not aligned
;
; This method takes three secret parameters on the stack:
;
; incoming:
;
; rsp -> nStackSlots
; entrypoint of shared MethodDesc
; extra stack param
; <space for StubHelperFrame>
; return address
; rcx home
; rdx home
; :
;
;
; Stack Layout:
;
; rsp-> callee scratch
; + 8h callee scratch
; +10h callee scratch
; +18h callee scratch
; :
; stack arguments
; :
; rbp-> nStackSlots
; + 8h entrypoint of shared MethodDesc
; +10h extra stack param
; +18h padding
; +20h gsCookie
; +28h __VFN_table
; +30h m_Next
; +38h m_calleeSavedRegisters
; +98h m_ReturnAddress
; +a0h rcx home
; +a8h rdx home
; +b0h r8 home
; +b8h r9 home
;
NESTED_ENTRY InstantiatingMethodStubWorker, _TEXT
.allocstack SIZEOF_FIXED_FRAME - 8h ; -8 for return address
SAVE_CALLEE_SAVED_REGISTERS OFFSETOF_FRAME_REGISTERS
SAVE_ARGUMENT_REGISTERS SIZEOF_FIXED_FRAME
set_frame rbp, 0
END_PROLOGUE
sub rsp, SIZEOF_MAX_OUTGOING_ARGUMENT_HOMES
;
; fully initialize the StubHelperFrame
;
mov rax, s_pStubHelperFrameVPtr
mov [rbp + OFFSETOF_FRAME], rax
mov rax, s_gsCookie
mov [rbp + OFFSETOF_GSCOOKIE], rax
;
; link the StubHelperFrame
;
INLINE_GETTHREAD r12
mov rdx, [r12 + OFFSETOF__Thread__m_pFrame]
mov [rbp + OFFSETOF_FRAME + OFFSETOF__Frame__m_Next], rdx
lea rcx, [rbp + OFFSETOF_FRAME]
mov [r12 + OFFSETOF__Thread__m_pFrame], rcx
add rsp, SIZEOF_MAX_OUTGOING_ARGUMENT_HOMES
mov rcx, [rbp + OFFSETOF_SECRET_PARAMS + 0h] ; nStackSlots (includes padding for stack alignment)
lea rsi, [rbp + SIZEOF_FIXED_FRAME + SIZEOF_MAX_OUTGOING_ARGUMENT_HOMES + 8 * rcx]
StackCopyLoop: ; copy the arguments to stack top-down to carefully probe for sufficient stack space
sub rsi, 8
push qword ptr [rsi]
dec rcx
jnz StackCopyLoop
push qword ptr [rbp+OFFSETOF_SECRET_PARAMS + 10h] ; push extra stack arg
sub rsp, SIZEOF_MAX_OUTGOING_ARGUMENT_HOMES
mov rcx, [rbp + SIZEOF_FIXED_FRAME + 00h]
mov rdx, [rbp + SIZEOF_FIXED_FRAME + 08h]
mov r8, [rbp + SIZEOF_FIXED_FRAME + 10h]
mov r9, [rbp + SIZEOF_FIXED_FRAME + 18h]
call qword ptr [rbp+OFFSETOF_SECRET_PARAMS + 8h] ; call target
ifdef _DEBUG
mov rcx, s_gsCookie
cmp [rbp + OFFSETOF_GSCookie], rcx
je GoodGSCookie
call JIT_FailFast
GoodGSCookie:
endif ; _DEBUG
;
; unlink the StubHelperFrame
;
mov rcx, [rbp + OFFSETOF_FRAME + OFFSETOF__Frame__m_Next]
mov [r12 + OFFSETOF__Thread__m_pFrame], rcx
;
; epilog
;
lea rsp, [rbp + OFFSETOF_FRAME_REGISTERS]
POP_CALLEE_SAVED_REGISTERS
ret
NESTED_END InstantiatingMethodStubWorker, _TEXT
end
|
