1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
|
/*
* EFI image loader
*
* based partly on wine code
*
* Copyright (c) 2016 Alexander Graf
*
* SPDX-License-Identifier: GPL-2.0+
*/
#include <common.h>
#include <efi_loader.h>
#include <pe.h>
#include <asm/global_data.h>
DECLARE_GLOBAL_DATA_PTR;
const efi_guid_t efi_global_variable_guid = EFI_GLOBAL_VARIABLE_GUID;
const efi_guid_t efi_guid_device_path = DEVICE_PATH_GUID;
const efi_guid_t efi_guid_loaded_image = LOADED_IMAGE_GUID;
const efi_guid_t efi_simple_file_system_protocol_guid =
EFI_SIMPLE_FILE_SYSTEM_PROTOCOL_GUID;
const efi_guid_t efi_file_info_guid = EFI_FILE_INFO_GUID;
static efi_status_t efi_loader_relocate(const IMAGE_BASE_RELOCATION *rel,
unsigned long rel_size, void *efi_reloc)
{
const IMAGE_BASE_RELOCATION *end;
int i;
end = (const IMAGE_BASE_RELOCATION *)((const char *)rel + rel_size);
while (rel < end - 1 && rel->SizeOfBlock) {
const uint16_t *relocs = (const uint16_t *)(rel + 1);
i = (rel->SizeOfBlock - sizeof(*rel)) / sizeof(uint16_t);
while (i--) {
uint32_t offset = (uint32_t)(*relocs & 0xfff) +
rel->VirtualAddress;
int type = *relocs >> EFI_PAGE_SHIFT;
unsigned long delta = (unsigned long)efi_reloc;
uint64_t *x64 = efi_reloc + offset;
uint32_t *x32 = efi_reloc + offset;
uint16_t *x16 = efi_reloc + offset;
switch (type) {
case IMAGE_REL_BASED_ABSOLUTE:
break;
case IMAGE_REL_BASED_HIGH:
*x16 += ((uint32_t)delta) >> 16;
break;
case IMAGE_REL_BASED_LOW:
*x16 += (uint16_t)delta;
break;
case IMAGE_REL_BASED_HIGHLOW:
*x32 += (uint32_t)delta;
break;
case IMAGE_REL_BASED_DIR64:
*x64 += (uint64_t)delta;
break;
default:
printf("Unknown Relocation off %x type %x\n",
offset, type);
return EFI_LOAD_ERROR;
}
relocs++;
}
rel = (const IMAGE_BASE_RELOCATION *)relocs;
}
return EFI_SUCCESS;
}
void __weak invalidate_icache_all(void)
{
/* If the system doesn't support icache_all flush, cross our fingers */
}
/*
* Determine the memory types to be used for code and data.
*
* @loaded_image_info image descriptor
* @image_type field Subsystem of the optional header for
* Windows specific field
*/
static void efi_set_code_and_data_type(
struct efi_loaded_image *loaded_image_info,
uint16_t image_type)
{
switch (image_type) {
case IMAGE_SUBSYSTEM_EFI_APPLICATION:
loaded_image_info->image_code_type = EFI_LOADER_CODE;
loaded_image_info->image_data_type = EFI_LOADER_DATA;
break;
case IMAGE_SUBSYSTEM_EFI_BOOT_SERVICE_DRIVER:
loaded_image_info->image_code_type = EFI_BOOT_SERVICES_CODE;
loaded_image_info->image_data_type = EFI_BOOT_SERVICES_DATA;
break;
case IMAGE_SUBSYSTEM_EFI_RUNTIME_DRIVER:
case IMAGE_SUBSYSTEM_EFI_ROM:
loaded_image_info->image_code_type = EFI_RUNTIME_SERVICES_CODE;
loaded_image_info->image_data_type = EFI_RUNTIME_SERVICES_DATA;
break;
default:
printf("%s: invalid image type: %u\n", __func__, image_type);
/* Let's assume it is an application */
loaded_image_info->image_code_type = EFI_LOADER_CODE;
loaded_image_info->image_data_type = EFI_LOADER_DATA;
break;
}
}
/*
* This function loads all sections from a PE binary into a newly reserved
* piece of memory. On successful load it then returns the entry point for
* the binary. Otherwise NULL.
*/
void *efi_load_pe(void *efi, struct efi_loaded_image *loaded_image_info)
{
IMAGE_NT_HEADERS32 *nt;
IMAGE_DOS_HEADER *dos;
IMAGE_SECTION_HEADER *sections;
int num_sections;
void *efi_reloc;
int i;
const IMAGE_BASE_RELOCATION *rel;
unsigned long rel_size;
int rel_idx = IMAGE_DIRECTORY_ENTRY_BASERELOC;
void *entry;
uint64_t image_size;
unsigned long virt_size = 0;
bool can_run_nt64 = true;
bool can_run_nt32 = true;
#if defined(CONFIG_ARM64)
can_run_nt32 = false;
#elif defined(CONFIG_ARM)
can_run_nt64 = false;
#endif
dos = efi;
if (dos->e_magic != IMAGE_DOS_SIGNATURE) {
printf("%s: Invalid DOS Signature\n", __func__);
return NULL;
}
nt = (void *) ((char *)efi + dos->e_lfanew);
if (nt->Signature != IMAGE_NT_SIGNATURE) {
printf("%s: Invalid NT Signature\n", __func__);
return NULL;
}
/* Calculate upper virtual address boundary */
num_sections = nt->FileHeader.NumberOfSections;
sections = (void *)&nt->OptionalHeader +
nt->FileHeader.SizeOfOptionalHeader;
for (i = num_sections - 1; i >= 0; i--) {
IMAGE_SECTION_HEADER *sec = §ions[i];
virt_size = max_t(unsigned long, virt_size,
sec->VirtualAddress + sec->Misc.VirtualSize);
}
/* Read 32/64bit specific header bits */
if (can_run_nt64 &&
(nt->OptionalHeader.Magic == IMAGE_NT_OPTIONAL_HDR64_MAGIC)) {
IMAGE_NT_HEADERS64 *nt64 = (void *)nt;
IMAGE_OPTIONAL_HEADER64 *opt = &nt64->OptionalHeader;
image_size = opt->SizeOfImage;
efi_set_code_and_data_type(loaded_image_info, opt->Subsystem);
efi_reloc = efi_alloc(virt_size,
loaded_image_info->image_code_type);
if (!efi_reloc) {
printf("%s: Could not allocate %lu bytes\n",
__func__, virt_size);
return NULL;
}
entry = efi_reloc + opt->AddressOfEntryPoint;
rel_size = opt->DataDirectory[rel_idx].Size;
rel = efi_reloc + opt->DataDirectory[rel_idx].VirtualAddress;
virt_size = ALIGN(virt_size, opt->SectionAlignment);
} else if (can_run_nt32 &&
(nt->OptionalHeader.Magic == IMAGE_NT_OPTIONAL_HDR32_MAGIC)) {
IMAGE_OPTIONAL_HEADER32 *opt = &nt->OptionalHeader;
image_size = opt->SizeOfImage;
efi_set_code_and_data_type(loaded_image_info, opt->Subsystem);
efi_reloc = efi_alloc(virt_size,
loaded_image_info->image_code_type);
if (!efi_reloc) {
printf("%s: Could not allocate %lu bytes\n",
__func__, virt_size);
return NULL;
}
entry = efi_reloc + opt->AddressOfEntryPoint;
rel_size = opt->DataDirectory[rel_idx].Size;
rel = efi_reloc + opt->DataDirectory[rel_idx].VirtualAddress;
virt_size = ALIGN(virt_size, opt->SectionAlignment);
} else {
printf("%s: Invalid optional header magic %x\n", __func__,
nt->OptionalHeader.Magic);
return NULL;
}
/* Load sections into RAM */
for (i = num_sections - 1; i >= 0; i--) {
IMAGE_SECTION_HEADER *sec = §ions[i];
memset(efi_reloc + sec->VirtualAddress, 0,
sec->Misc.VirtualSize);
memcpy(efi_reloc + sec->VirtualAddress,
efi + sec->PointerToRawData,
sec->SizeOfRawData);
}
/* Run through relocations */
if (efi_loader_relocate(rel, rel_size, efi_reloc) != EFI_SUCCESS) {
efi_free_pages((uintptr_t) efi_reloc,
(virt_size + EFI_PAGE_MASK) >> EFI_PAGE_SHIFT);
return NULL;
}
/* Flush cache */
flush_cache((ulong)efi_reloc,
ALIGN(virt_size, CONFIG_SYS_CACHELINE_SIZE));
invalidate_icache_all();
/* Populate the loaded image interface bits */
loaded_image_info->image_base = efi;
loaded_image_info->image_size = image_size;
loaded_image_info->reloc_base = efi_reloc;
loaded_image_info->reloc_size = virt_size;
return entry;
}
|
