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1 | /** @file\r | |
2 | This program generates a hex array to be manually coppied into\r | |
3 | OvmfXen.fdf.\r | |
4 | \r | |
5 | The purpose is for the flash device image to be recognize as an ELF.\r | |
6 | \r | |
7 | Copyright (c) 2019, Citrix Systems, Inc.\r | |
8 | \r | |
9 | SPDX-License-Identifier: BSD-2-Clause-Patent\r | |
10 | **/\r | |
11 | \r | |
12 | #include "elf.h"\r | |
13 | #include "stdio.h"\r | |
14 | #include "stddef.h"\r | |
15 | \r | |
16 | void print_hdr(void *s, size_t size)\r | |
17 | {\r | |
18 | char *c = s;\r | |
19 | \r | |
20 | while (size--) {\r | |
21 | printf("0x%02hhx, ", *(c++));\r | |
22 | }\r | |
23 | }\r | |
24 | \r | |
25 | /* Format for the XEN_ELFNOTE_PHYS32_ENTRY program segment */\r | |
26 | #define XEN_ELFNOTE_PHYS32_ENTRY 18\r | |
27 | typedef struct {\r | |
28 | uint32_t name_size;\r | |
29 | uint32_t desc_size;\r | |
30 | uint32_t type;\r | |
31 | char name[4];\r | |
32 | uint32_t desc;\r | |
33 | } xen_elfnote_phys32_entry;\r | |
34 | \r | |
35 | int main(void)\r | |
36 | {\r | |
37 | /* FW_SIZE */\r | |
38 | size_t ovmf_blob_size = 0x00200000;\r | |
39 | /* Load OVMF at 1MB when running as PVH guest */\r | |
40 | uint32_t ovmf_base_address = 0x00100000;\r | |
41 | /* Xen PVH entry point */\r | |
42 | uint32_t ovmfxen_pvh_entry_point = ovmf_base_address + ovmf_blob_size - 0x30;\r | |
43 | size_t offset_into_file = 0;\r | |
44 | \r | |
45 | /* ELF file header */\r | |
46 | Elf32_Ehdr hdr = {\r | |
47 | .e_ident = ELFMAG,\r | |
48 | .e_type = ET_EXEC,\r | |
49 | .e_machine = EM_386,\r | |
50 | .e_version = EV_CURRENT,\r | |
51 | .e_entry = ovmfxen_pvh_entry_point,\r | |
52 | .e_flags = R_386_NONE,\r | |
53 | .e_ehsize = sizeof (hdr),\r | |
54 | .e_phentsize = sizeof (Elf32_Phdr),\r | |
55 | };\r | |
56 | offset_into_file += sizeof (hdr);\r | |
57 | \r | |
58 | hdr.e_ident[EI_CLASS] = ELFCLASS32;\r | |
59 | hdr.e_ident[EI_DATA] = ELFDATA2LSB;\r | |
60 | hdr.e_ident[EI_VERSION] = EV_CURRENT;\r | |
61 | hdr.e_ident[EI_OSABI] = ELFOSABI_LINUX;\r | |
62 | /* Placing program headers just after hdr */\r | |
63 | hdr.e_phoff = sizeof (hdr);\r | |
64 | \r | |
65 | /* program header */\r | |
66 | Elf32_Phdr phdr_load = {\r | |
67 | .p_type = PT_LOAD,\r | |
68 | .p_offset = 0, /* load everything */\r | |
69 | .p_paddr = ovmf_base_address,\r | |
70 | .p_filesz = ovmf_blob_size,\r | |
71 | .p_memsz = ovmf_blob_size,\r | |
72 | .p_flags = PF_X | PF_W | PF_R,\r | |
73 | .p_align = 0,\r | |
74 | };\r | |
75 | phdr_load.p_vaddr = phdr_load.p_paddr;\r | |
76 | hdr.e_phnum += 1;\r | |
77 | offset_into_file += sizeof (phdr_load);\r | |
78 | \r | |
79 | /* Xen ELF Note. */\r | |
80 | \r | |
81 | xen_elfnote_phys32_entry xen_elf_note = {\r | |
82 | .type = XEN_ELFNOTE_PHYS32_ENTRY,\r | |
83 | .name = "Xen",\r | |
84 | .desc = ovmfxen_pvh_entry_point,\r | |
85 | .name_size =\r | |
86 | offsetof (xen_elfnote_phys32_entry, desc) -\r | |
87 | offsetof (xen_elfnote_phys32_entry, name),\r | |
88 | .desc_size =\r | |
89 | sizeof (xen_elfnote_phys32_entry) -\r | |
90 | offsetof (xen_elfnote_phys32_entry, desc),\r | |
91 | };\r | |
92 | Elf32_Phdr phdr_note = {\r | |
93 | .p_type = PT_NOTE,\r | |
94 | .p_filesz = sizeof (xen_elf_note),\r | |
95 | .p_memsz = sizeof (xen_elf_note),\r | |
96 | .p_flags = PF_R,\r | |
97 | .p_align = 0,\r | |
98 | };\r | |
99 | hdr.e_phnum += 1;\r | |
100 | offset_into_file += sizeof (phdr_note);\r | |
101 | phdr_note.p_offset = offset_into_file;\r | |
102 | phdr_note.p_paddr = ovmf_base_address + phdr_note.p_offset;\r | |
103 | phdr_note.p_vaddr = phdr_note.p_paddr;\r | |
104 | \r | |
105 | \r | |
106 | /*\r | |
107 | * print elf header\r | |
108 | */\r | |
109 | \r | |
110 | size_t i;\r | |
111 | size_t hdr_size = sizeof (hdr);\r | |
112 | size_t entry_off = offsetof(typeof(hdr), e_entry);\r | |
113 | \r | |
114 | printf("# ELF file header\n");\r | |
115 | print_hdr(&hdr, entry_off);\r | |
116 | printf("\n");\r | |
117 | print_hdr(&hdr.e_entry, sizeof (hdr.e_entry));\r | |
118 | printf(" # hdr.e_entry\n");\r | |
119 | print_hdr(&hdr.e_entry + 1, hdr_size - entry_off - sizeof (hdr.e_entry));\r | |
120 | \r | |
121 | printf("\n\n# ELF Program segment headers\n");\r | |
122 | printf("# - Load segment\n");\r | |
123 | for (i = 0; i < sizeof (phdr_load); i += 4) {\r | |
124 | print_hdr(((char*)&phdr_load) + i, 4);\r | |
125 | printf("\n");\r | |
126 | }\r | |
127 | printf("# - ELFNOTE segment\n");\r | |
128 | for (i = 0; i < sizeof (phdr_note); i += 4) {\r | |
129 | print_hdr(((char*)&phdr_note) + i, 4);\r | |
130 | printf("\n");\r | |
131 | }\r | |
132 | \r | |
133 | printf("\n# XEN_ELFNOTE_PHYS32_ENTRY\n");\r | |
134 | for (i = 0; i < sizeof (xen_elf_note); i += 4) {\r | |
135 | print_hdr(((char*)&xen_elf_note) + i, 4);\r | |
136 | printf("\n");\r | |
137 | }\r | |
138 | \r | |
139 | return 0;\r | |
140 | }\r |