path: root/loader/unknown_ext_chain_masm.asm

;
; Copyright (c) 2017-2021 The Khronos Group Inc.
; Copyright (c) 2017-2021 Valve Corporation
; Copyright (c) 2017-2021 LunarG, Inc.
;
; Licensed under the Apache License, Version 2.0 (the "License");
; you may not use this file except in compliance with the License.
; You may obtain a copy of the License at
;
;     http://www.apache.org/licenses/LICENSE-2.0
;
; Unless required by applicable law or agreed to in writing, software
; distributed under the License is distributed on an "AS IS" BASIS,
; WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
; See the License for the specific language governing permissions and
; limitations under the License.
;
; Author: Lenny Komow <lenny@lunarg.com>
; Author: Charles Giessen <charles@lunarg.com>
;

; This code is used to pass on device (including physical device) extensions through the call chain. It must do this without
; creating a stack frame, because the actual parameters of the call are not known. Since the first parameter is known to be a
; VkPhysicalDevice or a dispatchable object it can unwrap the object, possibly overwriting the wrapped physical device, and then
; jump to the next function in the call chain

; Codegen defines a number of values, chiefly offsets of members within structs and sizes of data types within gen_defines.asm.
; Struct member offsets are defined in the format "XX_OFFSET_YY" where XX indicates the member within the struct and YY indicates
; the struct type that it is a member of. Data type sizes are defined in the format "XX_SIZE" where XX indicates the data type.
INCLUDE gen_defines.asm

; 64-bit values and macro
IFDEF rax

PhysDevExtTramp macro num:req
public vkPhysDevExtTramp&num&
vkPhysDevExtTramp&num&:
    mov     rax, qword ptr [rcx]                            ; Dereference the wrapped VkPhysicalDevice to get the dispatch table in rax
    mov     rcx, qword ptr [rcx + PHYS_DEV_OFFSET_PHYS_DEV_TRAMP]   ; Load the unwrapped VkPhysicalDevice into rcx
    jmp     qword ptr [rax + (PHYS_DEV_OFFSET_INST_DISPATCH + (PTR_SIZE * num))] ; Jump to the next function in the chain, preserving the args in other registers
endm

PhysDevExtTermin macro num
public vkPhysDevExtTermin&num&
vkPhysDevExtTermin&num&:
    mov     rax, qword ptr [rcx + ICD_TERM_OFFSET_PHYS_DEV_TERM]                ; Store the loader_icd_term* in rax
    cmp     qword ptr [rax + (DISPATCH_OFFSET_ICD_TERM + (PTR_SIZE * num))], 0  ; Check if the next function in the chain is NULL
    je      terminError&num&                                                    ; Go to the error section if it is NULL
    mov     rcx, qword ptr [rcx + PHYS_DEV_OFFSET_PHYS_DEV_TERM]                ; Load the unwrapped VkPhysicalDevice into the first arg
    jmp     qword ptr [rax + (DISPATCH_OFFSET_ICD_TERM + (PTR_SIZE * num))]     ; Jump to the next function in the chain
terminError&num&:
    sub     rsp, 56                                                             ; Create the stack frame
    mov     rcx, qword ptr [rax + INSTANCE_OFFSET_ICD_TERM]                     ; Load the loader_instance into rcx (first arg)
    mov     rax, qword ptr [rcx + (FUNCTION_OFFSET_INSTANCE + (CHAR_PTR_SIZE * num))] ; Load the func name into rax
    lea     r9, termin_error_string                                             ; Load the error string into r9 (fourth arg)
    xor     r8d, r8d                                                            ; Set r8 to zero (third arg)
    mov     qword ptr [rsp + 32], rax                                           ; Move the func name onto the stack (fifth arg)
    lea     edx, [r8 + VULKAN_LOADER_ERROR_BIT]                                 ; Write the error logging bit to rdx (second arg)
    call    loader_log                                                          ; Log the error message before we crash
    add     rsp, 56                                                             ; Clean up the stack frame
    mov     rax, 0
    jmp     rax                                                                 ; Crash intentionally by jumping to address zero
endm

DevExtTramp macro num
public vkdev_ext&num&
vkdev_ext&num&:
    mov     rax, qword ptr [rcx]                                               ; Dereference the handle to get the dispatch table
    jmp     qword ptr [rax + (EXT_OFFSET_DEVICE_DISPATCH + (PTR_SIZE * num))]  ; Jump to the appropriate call chain
endm

; 32-bit values and macro
ELSE

PhysDevExtTramp macro num
public _vkPhysDevExtTramp&num&@4
_vkPhysDevExtTramp&num&@4:
    mov     eax, dword ptr [esp + 4]                        ; Load the wrapped VkPhysicalDevice into eax
    mov     ecx, [eax + PHYS_DEV_OFFSET_PHYS_DEV_TRAMP]     ; Load the unwrapped VkPhysicalDevice into ecx
    mov     [esp + 4], ecx                                  ; Overwrite the wrapped VkPhysicalDevice with the unwrapped one (on the stack)
    mov     eax, [eax]                                      ; Dereference the wrapped VkPhysicalDevice to get the dispatch table in eax
    jmp     dword ptr [eax + (PHYS_DEV_OFFSET_INST_DISPATCH + (PTR_SIZE * num))] ; Jump to the next function in the chain, preserving the args on the stack
endm

PhysDevExtTermin macro num
public _vkPhysDevExtTermin&num&@4
_vkPhysDevExtTermin&num&@4:
    mov     ecx, dword ptr [esp + 4]                                            ; Move the wrapped VkPhysicalDevice into ecx
    mov     eax, dword ptr [ecx + ICD_TERM_OFFSET_PHYS_DEV_TERM]                ; Store the loader_icd_term* in eax
    cmp     dword ptr [eax + (DISPATCH_OFFSET_ICD_TERM + (PTR_SIZE * num))], 0  ; Check if the next function in the chain is NULL
    je      terminError&num&                                                    ; Go to the error section if it is NULL
    mov     ecx, dword ptr [ecx + PHYS_DEV_OFFSET_PHYS_DEV_TERM]                ; Unwrap the VkPhysicalDevice in ecx
    mov     dword ptr [esp + 4], ecx                                            ; Copy the unwrapped VkPhysicalDevice into the first arg
    jmp     dword ptr [eax + (DISPATCH_OFFSET_ICD_TERM + (PTR_SIZE * num))]     ; Jump to the next function in the chain
terminError&num&:
    mov     eax, dword ptr [eax + INSTANCE_OFFSET_ICD_TERM]                     ; Load the loader_instance into eax
    push    dword ptr [eax + (FUNCTION_OFFSET_INSTANCE + (CHAR_PTR_SIZE * num))] ; Push the func name (fifth arg)
    push    offset termin_error_string                                          ; Push the error string (fourth arg)
    push    0                                                                   ; Push zero (third arg)
    push    VULKAN_LOADER_ERROR_BIT                                             ; Push the error logging bit (second arg)
    push    eax                                                                 ; Push the loader_instance (first arg)
    call    _loader_log                                                         ; Log the error message before we crash
    add     esp, 20                                                             ; Clean up the args
    mov     eax, 0
    jmp     eax                                                                 ; Crash intentionally by jumping to address zero
endm

DevExtTramp macro num
public _vkdev_ext&num&@4
_vkdev_ext&num&@4:
    mov     eax, dword ptr [esp + 4]                                           ; Dereference the handle to get VkDevice chain_device
    mov     eax, dword ptr [eax]                                               ; Dereference the chain_device to get the loader_dispatch
    jmp     dword ptr [eax + (EXT_OFFSET_DEVICE_DISPATCH + (PTR_SIZE * num))]  ; Jump to the appropriate call chain
endm

; This is also needed for 32-bit only
.model flat

ENDIF

.const
    termin_error_string db 'Function %s not supported for this physical device', 0

.code

IFDEF rax
extrn loader_log:near
ELSE
extrn _loader_log:near
ENDIF

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    PhysDevExtTermin 0
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    DevExtTramp 0
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end