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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.
.intel_syntax noprefix
#include "unixasmmacros.inc"
#include "asmconstants.h"
//
// in:
// PINVOKE_CALLI_TARGET_REGISTER (r10) = unmanaged target
// PINVOKE_CALLI_SIGTOKEN_REGNUM (r11) = sig token
//
// out:
// METHODDESC_REGISTER (r10) = unmanaged target
//
LEAF_ENTRY GenericPInvokeCalliHelper, _TEXT
//
// check for existing IL stub
//
mov rax, [PINVOKE_CALLI_SIGTOKEN_REGISTER + OFFSETOF__VASigCookie__pNDirectILStub]
test rax, rax
jz C_FUNC(GenericPInvokeCalliGenILStub)
//
// We need to distinguish between a MethodDesc* and an unmanaged target in PInvokeStubForHost().
// The way we do this is to shift the managed target to the left by one bit and then set the
// least significant bit to 1. This works because MethodDesc* are always 8-byte aligned.
//
shl PINVOKE_CALLI_TARGET_REGISTER, 1
or PINVOKE_CALLI_TARGET_REGISTER, 1
//
// jump to existing IL stub
//
jmp rax
LEAF_END GenericPInvokeCalliHelper, _TEXT
NESTED_ENTRY GenericPInvokeCalliGenILStub, _TEXT, NoHandler
PROLOG_WITH_TRANSITION_BLOCK
//
// save target
//
mov r12, METHODDESC_REGISTER
mov r13, PINVOKE_CALLI_SIGTOKEN_REGISTER
//
// GenericPInvokeCalliStubWorker(TransitionBlock * pTransitionBlock, VASigCookie * pVASigCookie, PCODE pUnmanagedTarget)
//
lea rdi, [rsp + __PWTB_TransitionBlock] // pTransitionBlock*
mov rsi, PINVOKE_CALLI_SIGTOKEN_REGISTER // pVASigCookie
mov rdx, METHODDESC_REGISTER // pUnmanagedTarget
call C_FUNC(GenericPInvokeCalliStubWorker)
//
// restore target
//
mov METHODDESC_REGISTER, r12
mov PINVOKE_CALLI_SIGTOKEN_REGISTER, r13
EPILOG_WITH_TRANSITION_BLOCK_TAILCALL
jmp C_FUNC(GenericPInvokeCalliHelper)
NESTED_END GenericPInvokeCalliGenILStub, _TEXT
LEAF_ENTRY VarargPInvokeStub, _TEXT
mov PINVOKE_CALLI_SIGTOKEN_REGISTER, rdi
jmp C_FUNC(VarargPInvokeStubHelper)
LEAF_END VarargPInvokeStub, _TEXT
LEAF_ENTRY VarargPInvokeStub_RetBuffArg, _TEXT
mov PINVOKE_CALLI_SIGTOKEN_REGISTER, rsi
jmp C_FUNC(VarargPInvokeStubHelper)
LEAF_END VarargPInvokeStub_RetBuffArg, _TEXT
LEAF_ENTRY VarargPInvokeStubHelper, _TEXT
//
// check for existing IL stub
//
mov rax, [PINVOKE_CALLI_SIGTOKEN_REGISTER + OFFSETOF__VASigCookie__pNDirectILStub]
test rax, rax
jz C_FUNC(VarargPInvokeGenILStub)
//
// jump to existing IL stub
//
jmp rax
LEAF_END VarargPInvokeStubHelper, _TEXT
//
// IN: METHODDESC_REGISTER (R10) stub secret param
// PINVOKE_CALLI_SIGTOKEN_REGISTER (R11) VASigCookie*
//
// ASSUMES: we already checked for an existing stub to use
//
NESTED_ENTRY VarargPInvokeGenILStub, _TEXT, NoHandler
PROLOG_WITH_TRANSITION_BLOCK
//
// save target
//
mov r12, METHODDESC_REGISTER
mov r13, PINVOKE_CALLI_SIGTOKEN_REGISTER
//
// VarargPInvokeStubWorker(TransitionBlock * pTransitionBlock, VASigCookie *pVASigCookie, MethodDesc *pMD)
//
lea rdi, [rsp + __PWTB_TransitionBlock] // pTransitionBlock*
mov rsi, PINVOKE_CALLI_SIGTOKEN_REGISTER // pVASigCookie
mov rdx, METHODDESC_REGISTER // pMD
call C_FUNC(VarargPInvokeStubWorker)
//
// restore target
//
mov METHODDESC_REGISTER, r12
mov PINVOKE_CALLI_SIGTOKEN_REGISTER, r13
EPILOG_WITH_TRANSITION_BLOCK_TAILCALL
jmp C_FUNC(VarargPInvokeStubHelper)
NESTED_END VarargPInvokeGenILStub, _TEXT
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