123456789101112131415161718192021222324252627282930313233343536373839404142434445464748495051525354555657585960616263646566676869707172737475767778798081828384858687888990919293949596979899100101102103104105106107108109110111112113114115116117118119120121122123124125126127128129130131132133134135136137138139140 |
- /** @file
- This program generates a hex array to be manually coppied into
- OvmfXen.fdf.
- The purpose is for the flash device image to be recognize as an ELF.
- Copyright (c) 2019, Citrix Systems, Inc.
- SPDX-License-Identifier: BSD-2-Clause-Patent
- **/
- #include "elf.h"
- #include "stdio.h"
- #include "stddef.h"
- void print_hdr(void *s, size_t size)
- {
- char *c = s;
- while (size--) {
- printf("0x%02hhx, ", *(c++));
- }
- }
- /* Format for the XEN_ELFNOTE_PHYS32_ENTRY program segment */
- #define XEN_ELFNOTE_PHYS32_ENTRY 18
- typedef struct {
- uint32_t name_size;
- uint32_t desc_size;
- uint32_t type;
- char name[4];
- uint32_t desc;
- } xen_elfnote_phys32_entry;
- int main(void)
- {
- /* FW_SIZE */
- size_t ovmf_blob_size = 0x00200000;
- /* Load OVMF at 1MB when running as PVH guest */
- uint32_t ovmf_base_address = 0x00100000;
- /* Xen PVH entry point */
- uint32_t ovmfxen_pvh_entry_point = ovmf_base_address + ovmf_blob_size - 0x30;
- size_t offset_into_file = 0;
- /* ELF file header */
- Elf32_Ehdr hdr = {
- .e_ident = ELFMAG,
- .e_type = ET_EXEC,
- .e_machine = EM_386,
- .e_version = EV_CURRENT,
- .e_entry = ovmfxen_pvh_entry_point,
- .e_flags = R_386_NONE,
- .e_ehsize = sizeof (hdr),
- .e_phentsize = sizeof (Elf32_Phdr),
- };
- offset_into_file += sizeof (hdr);
- hdr.e_ident[EI_CLASS] = ELFCLASS32;
- hdr.e_ident[EI_DATA] = ELFDATA2LSB;
- hdr.e_ident[EI_VERSION] = EV_CURRENT;
- hdr.e_ident[EI_OSABI] = ELFOSABI_LINUX;
- /* Placing program headers just after hdr */
- hdr.e_phoff = sizeof (hdr);
- /* program header */
- Elf32_Phdr phdr_load = {
- .p_type = PT_LOAD,
- .p_offset = 0, /* load everything */
- .p_paddr = ovmf_base_address,
- .p_filesz = ovmf_blob_size,
- .p_memsz = ovmf_blob_size,
- .p_flags = PF_X | PF_W | PF_R,
- .p_align = 0,
- };
- phdr_load.p_vaddr = phdr_load.p_paddr;
- hdr.e_phnum += 1;
- offset_into_file += sizeof (phdr_load);
- /* Xen ELF Note. */
- xen_elfnote_phys32_entry xen_elf_note = {
- .type = XEN_ELFNOTE_PHYS32_ENTRY,
- .name = "Xen",
- .desc = ovmfxen_pvh_entry_point,
- .name_size =
- offsetof (xen_elfnote_phys32_entry, desc) -
- offsetof (xen_elfnote_phys32_entry, name),
- .desc_size =
- sizeof (xen_elfnote_phys32_entry) -
- offsetof (xen_elfnote_phys32_entry, desc),
- };
- Elf32_Phdr phdr_note = {
- .p_type = PT_NOTE,
- .p_filesz = sizeof (xen_elf_note),
- .p_memsz = sizeof (xen_elf_note),
- .p_flags = PF_R,
- .p_align = 0,
- };
- hdr.e_phnum += 1;
- offset_into_file += sizeof (phdr_note);
- phdr_note.p_offset = offset_into_file;
- phdr_note.p_paddr = ovmf_base_address + phdr_note.p_offset;
- phdr_note.p_vaddr = phdr_note.p_paddr;
- /*
- * print elf header
- */
- size_t i;
- size_t hdr_size = sizeof (hdr);
- size_t entry_off = offsetof(typeof(hdr), e_entry);
- printf("# ELF file header\n");
- print_hdr(&hdr, entry_off);
- printf("\n");
- print_hdr(&hdr.e_entry, sizeof (hdr.e_entry));
- printf(" # hdr.e_entry\n");
- print_hdr(&hdr.e_entry + 1, hdr_size - entry_off - sizeof (hdr.e_entry));
- printf("\n\n# ELF Program segment headers\n");
- printf("# - Load segment\n");
- for (i = 0; i < sizeof (phdr_load); i += 4) {
- print_hdr(((char*)&phdr_load) + i, 4);
- printf("\n");
- }
- printf("# - ELFNOTE segment\n");
- for (i = 0; i < sizeof (phdr_note); i += 4) {
- print_hdr(((char*)&phdr_note) + i, 4);
- printf("\n");
- }
- printf("\n# XEN_ELFNOTE_PHYS32_ENTRY\n");
- for (i = 0; i < sizeof (xen_elf_note); i += 4) {
- print_hdr(((char*)&xen_elf_note) + i, 4);
- printf("\n");
- }
- return 0;
- }
|