1/*
2 * Copyright (c) 2017 The Khronos Group Inc.
3 * Copyright (c) 2017 Valve Corporation
4 * Copyright (c) 2017 LunarG, Inc.
5 *
6 * Licensed under the Apache License, Version 2.0 (the "License");
7 * you may not use this file except in compliance with the License.
8 * You may obtain a copy of the License at
9 *
10 *     http://www.apache.org/licenses/LICENSE-2.0
11 *
12 * Unless required by applicable law or agreed to in writing, software
13 * distributed under the License is distributed on an "AS IS" BASIS,
14 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
15 * See the License for the specific language governing permissions and
16 * limitations under the License.
17 *
18 * Author: Lenny Komow <lenny@lunarg.com>
19 */
20
21// This code generates an assembly file which provides offsets to get struct members from assembly code.
22
23#include <stdio.h>
24#include "loader.h"
25
26#if !defined(_MSC_VER) || (_MSC_VER >= 1900)
27#define SIZE_T_FMT "%-8zu"
28#else
29#define SIZE_T_FMT "%-8lu"
30#endif
31
32struct ValueInfo
33{
34    const char *name;
35    size_t value;
36    const char *comment;
37};
38
39int main(int argc, char **argv) {
40    const char *assembler = NULL;
41    for (int i = 0; i < argc; ++i) {
42        if (!strcmp(argv[i], "MASM")) {
43            assembler = "MASM";
44        } else if (!strcmp(argv[i], "GAS")) {
45            assembler = "GAS";
46        }
47    }
48    if (assembler == NULL) {
49        return 1;
50    }
51
52    struct loader_instance instance;
53    size_t hash_offset = ((size_t) &instance.phys_dev_ext_disp_hash) - ((size_t) &instance);
54
55    struct loader_instance_dispatch_table disp;
56    size_t phys_dev_offset_dispatch = ((size_t) &disp.phys_dev_ext) - ((size_t) &disp);
57
58    struct loader_physical_device_tramp phys_dev_tramp;
59    size_t phys_dev_offset_tramp = ((size_t) &phys_dev_tramp.phys_dev) - ((size_t) &phys_dev_tramp);
60
61    struct loader_physical_device_term phys_dev_term;
62    size_t icd_term_offset = ((size_t) &phys_dev_term.this_icd_term) - ((size_t) &phys_dev_term);
63    size_t phys_dev_offset_term = ((size_t) &phys_dev_term.phys_dev) - ((size_t) &phys_dev_term);
64
65    struct loader_icd_term icd_term;
66    size_t instance_offset = ((size_t) &icd_term.this_instance) - ((size_t) &icd_term);
67    size_t dispatch_offset = ((size_t) &icd_term.phys_dev_ext) - ((size_t) &icd_term);
68
69    struct loader_dispatch_hash_entry hash;
70    size_t func_name_offset = ((size_t) &hash.func_name) - ((size_t) &hash);
71
72    struct loader_dev_dispatch_table dev_disp;
73    size_t dev_disp_offset = ((size_t) &dev_disp.ext_dispatch) - ((size_t) &dev_disp);
74
75    struct ValueInfo values[] = {
76        { .name = "VK_DEBUG_REPORT_ERROR_BIT_EXT", .value = (size_t) VK_DEBUG_REPORT_ERROR_BIT_EXT,
77            .comment = "The numerical value of the enum value 'VK_DEBUG_REPORT_ERROR_BIT_EXT'" },
78        { .name = "PTR_SIZE", .value = sizeof(void*),
79            .comment = "The size of a pointer" },
80        { .name = "HASH_SIZE", .value = sizeof(struct loader_dispatch_hash_entry),
81            .comment = "The size of a 'loader_dispatch_hash_entry' struct" },
82        { .name = "HASH_OFFSET_INSTANCE", .value = hash_offset,
83            .comment = "The offset of 'phys_dev_ext_disp_hash' within a 'loader_instance' struct" },
84        { .name = "PHYS_DEV_OFFSET_INST_DISPATCH", .value = phys_dev_offset_dispatch,
85            .comment = "The offset of 'phys_dev_ext' within in 'loader_instance_dispatch_table' struct" },
86        { .name = "PHYS_DEV_OFFSET_PHYS_DEV_TRAMP", .value = phys_dev_offset_tramp,
87            .comment = "The offset of 'phys_dev' within a 'loader_physical_device_tramp' struct" },
88        { .name = "ICD_TERM_OFFSET_PHYS_DEV_TERM", .value = icd_term_offset,
89            .comment = "The offset of 'this_icd_term' within a 'loader_physical_device_term' struct" },
90        { .name = "PHYS_DEV_OFFSET_PHYS_DEV_TERM", .value = phys_dev_offset_term,
91            .comment = "The offset of 'phys_dev' within a 'loader_physical_device_term' struct" },
92        { .name = "INSTANCE_OFFSET_ICD_TERM", .value = instance_offset,
93            .comment = "The offset of 'this_instance' within a 'loader_icd_term' struct" },
94        { .name = "DISPATCH_OFFSET_ICD_TERM", .value = dispatch_offset,
95            .comment = "The offset of 'phys_dev_ext' within a 'loader_icd_term' struct" },
96        { .name = "FUNC_NAME_OFFSET_HASH", .value = func_name_offset,
97            .comment = "The offset of 'func_name' within a 'loader_dispatch_hash_entry' struct" },
98        { .name = "EXT_OFFSET_DEVICE_DISPATCH", .value = dev_disp_offset,
99            .comment = "The offset of 'ext_dispatch' within a 'loader_dev_dispatch_table' struct" },
100    };
101
102    FILE *file = fopen("gen_defines.asm", "w");
103    fprintf(file, "\n");
104    if (!strcmp(assembler, "MASM")) {
105        for (size_t i = 0; i < sizeof(values)/sizeof(values[0]); ++i) {
106            fprintf(file, "%-32s equ " SIZE_T_FMT "; %s\n", values[i].name, values[i].value, values[i].comment);
107        }
108    } else if (!strcmp(assembler, "GAS")) {
109#ifdef __x86_64__
110        fprintf(file, ".set X86_64, 1\n");
111#endif // __x86_64__
112        for (size_t i = 0; i < sizeof(values)/sizeof(values[0]); ++i) {
113            fprintf(file, ".set %-32s, " SIZE_T_FMT "# %s\n", values[i].name, values[i].value, values[i].comment);
114        }
115    }
116    return fclose(file);
117}
118