third_party_vulkan-loader/loader/unknown_ext_chain_gas_x86.S

#
# Copyright (c) 2017-2023 The Khronos Group Inc.
# Copyright (c) 2017-2023 Valve Corporation
# Copyright (c) 2017-2023 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

# The .hidden directive is only supported in ELF executables so in APPLE builds, the directive is removed

#if defined(HAVE_CET_H)
#include <cet.h>
#else
#define _CET_ENDBR
#endif

.intel_syntax noprefix
.include "gen_defines.asm"

.ifdef X86_64

.macro PhysDevExtTramp num
.global vkPhysDevExtTramp\num
#if defined(__ELF__)
.hidden vkPhysDevExtTramp\num
#endif
vkPhysDevExtTramp\num:
    _CET_ENDBR
    mov     rax, [rdi]
    mov     rdi, [rdi + PHYS_DEV_OFFSET_PHYS_DEV_TRAMP]
    jmp     [rax + (PHYS_DEV_OFFSET_INST_DISPATCH + (PTR_SIZE * \num))]
.endm

.macro PhysDevExtTermin num
.global vkPhysDevExtTermin\num
#if defined(__ELF__)
.hidden vkPhysDevExtTermin\num
#endif
vkPhysDevExtTermin\num:
    _CET_ENDBR
    mov     rax, [rdi + 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     rdi, [rdi + PHYS_DEV_OFFSET_PHYS_DEV_TERM]                          # Load the unwrapped VkPhysicalDevice into the first arg
    jmp     [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     rdi, [rax + INSTANCE_OFFSET_ICD_TERM]                               # Load the loader_instance into rdi (first arg)
    lea     rsi, [VULKAN_LOADER_ERROR_BIT]                                      # Write the error logging bit to rsi (second arg)
    xor     rdx, rdx                                                            # Set rdx to zero (third arg)
    lea     rcx, [rip + termin_error_string]                                    # Load the error string into rcx (fourth arg)
    mov     r8, [rdi + (FUNCTION_OFFSET_INSTANCE + (CHAR_PTR_SIZE * \num))]     # Load the func name into r8 (fifth 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

.macro DevExtTramp num
.global vkdev_ext\num
#if defined(__ELF__)
.hidden vkdev_ext\num
#endif
vkdev_ext\num:
    _CET_ENDBR
    mov     rax, [rdi]                                                          # Dereference the handle to get the dispatch table
    jmp     [rax + (EXT_OFFSET_DEVICE_DISPATCH + (PTR_SIZE * \num))]            # Jump to the appropriate call chain
.endm

.else

.macro PhysDevExtTramp num
.global vkPhysDevExtTramp\num
#if defined(__ELF__)
.hidden vkPhysDevExtTramp\num
#endif
vkPhysDevExtTramp\num:
    _CET_ENDBR
    mov     eax, [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     [eax + (PHYS_DEV_OFFSET_INST_DISPATCH + (PTR_SIZE * \num))] # Dereference the wrapped VkPhysicalDevice to get the dispatch table in eax
.endm

.macro PhysDevExtTermin num
.global vkPhysDevExtTermin\num
#if defined(__ELF__)
.hidden vkPhysDevExtTermin\num
#endif
vkPhysDevExtTermin\num:
    _CET_ENDBR
    mov     ecx, [esp + 4]                                                      # Move the wrapped VkPhysicalDevice into ecx
    mov     eax, [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, [ecx + PHYS_DEV_OFFSET_PHYS_DEV_TERM]                          # Unwrap the VkPhysicalDevice in ecx
    mov     [esp + 4], ecx                                                      # Copy the unwrapped VkPhysicalDevice into the first arg
    jmp     [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 (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_asm_function_not_supported                                 # 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

.macro DevExtTramp num
.global vkdev_ext\num
#if defined(__ELF__)
.hidden vkdev_ext\num
#endif
vkdev_ext\num:
    _CET_ENDBR
    mov     eax, dword ptr [esp + 4]                                            # Dereference the handle to get the dispatch table
    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

.endif

#if defined(__ELF__)
.section .note.GNU-stack,"",%progbits
#endif

.data

termin_error_string:
.string "Function %s not supported for this physical device"

.text

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