;------------------------------------------------------------------------------ | |
;* | |
;* Copyright (c) 2020 - 2021, Intel Corporation. All rights reserved.<BR> | |
;* SPDX-License-Identifier: BSD-2-Clause-Patent | |
;* | |
;* | |
;------------------------------------------------------------------------------ | |
DEFAULT REL | |
SECTION .text | |
%macro tdcall 0 | |
db 0x66,0x0f,0x01,0xcc | |
%endmacro | |
%macro tdcall_push_regs 0 | |
push rbp | |
mov rbp, rsp | |
push r15 | |
push r14 | |
push r13 | |
push r12 | |
push rbx | |
push rsi | |
push rdi | |
%endmacro | |
%macro tdcall_pop_regs 0 | |
pop rdi | |
pop rsi | |
pop rbx | |
pop r12 | |
pop r13 | |
pop r14 | |
pop r15 | |
pop rbp | |
%endmacro | |
%define number_of_regs_pushed 8 | |
%define number_of_parameters 4 | |
; | |
; Keep these in sync for push_regs/pop_regs, code below | |
; uses them to find 5th or greater parameters | |
; | |
%define first_variable_on_stack_offset \ | |
((number_of_regs_pushed * 8) + (number_of_parameters * 8) + 8) | |
%define second_variable_on_stack_offset \ | |
((first_variable_on_stack_offset) + 8) | |
; TdCall ( | |
; UINT64 Leaf, // Rcx | |
; UINT64 P1, // Rdx | |
; UINT64 P2, // R8 | |
; UINT64 P3, // R9 | |
; UINT64 Results, // rsp + 0x28 | |
; ) | |
global ASM_PFX(TdCall) | |
ASM_PFX(TdCall): | |
tdcall_push_regs | |
mov rax, rcx | |
mov rcx, rdx | |
mov rdx, r8 | |
mov r8, r9 | |
tdcall | |
; exit if tdcall reports failure. | |
test rax, rax | |
jnz .exit | |
; test if caller wanted results | |
mov r12, [rsp + first_variable_on_stack_offset ] | |
test r12, r12 | |
jz .exit | |
mov [r12 + 0 ], rcx | |
mov [r12 + 8 ], rdx | |
mov [r12 + 16], r8 | |
mov [r12 + 24], r9 | |
mov [r12 + 32], r10 | |
mov [r12 + 40], r11 | |
.exit: | |
tdcall_pop_regs | |
ret |