107 lines
2.3 KiB
C
107 lines
2.3 KiB
C
#include "elf_loader.h"
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#include "tianole/elf.h"
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static void *mem_copy(void *dst, const void *src, uint64_t size)
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{
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uint8_t *out = (uint8_t *)dst;
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const uint8_t *in = (const uint8_t *)src;
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uint64_t i;
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for (i = 0; i < size; ++i) {
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out[i] = in[i];
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}
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return dst;
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}
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static void mem_zero(void *dst, uint64_t size)
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{
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uint8_t *out = (uint8_t *)dst;
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uint64_t i;
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for (i = 0; i < size; ++i) {
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out[i] = 0;
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}
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}
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static efi_status validate_kernel_elf(const elf64_ehdr_t *ehdr)
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{
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if (*(const uint32_t *)ehdr->ident != ELF_MAGIC) {
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return EFI_LOAD_ERROR;
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}
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if (ehdr->ident[4] != ELFCLASS64 || ehdr->ident[5] != ELFDATA2LSB) {
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return EFI_LOAD_ERROR;
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}
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if (ehdr->ident[6] != EV_CURRENT || ehdr->version != EV_CURRENT) {
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return EFI_LOAD_ERROR;
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}
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if (ehdr->type != ET_EXEC || ehdr->machine != EM_X86_64) {
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return EFI_LOAD_ERROR;
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}
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if (ehdr->phentsize != sizeof(elf64_phdr_t)) {
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return EFI_LOAD_ERROR;
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}
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return EFI_SUCCESS;
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}
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efi_status boot_load_kernel_elf(efi_system_table_t *system_table,
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const void *kernel_image,
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uint64_t kernel_size,
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kernel_entry_fn_t *entry_out)
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{
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const elf64_ehdr_t *ehdr = (const elf64_ehdr_t *)kernel_image;
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const elf64_phdr_t *phdrs;
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uint16_t index;
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efi_status status;
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if (kernel_size < sizeof(*ehdr)) {
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return EFI_LOAD_ERROR;
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}
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status = validate_kernel_elf(ehdr);
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if (status != EFI_SUCCESS) {
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return status;
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}
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phdrs = (const elf64_phdr_t *)((const uint8_t *)kernel_image +
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ehdr->phoff);
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for (index = 0; index < ehdr->phnum; ++index) {
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const elf64_phdr_t *phdr = &phdrs[index];
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efi_physical_address_t segment_base;
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uint64_t page_count;
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if (phdr->type != PT_LOAD) {
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continue;
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}
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if (phdr->memsz < phdr->filesz) {
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return EFI_LOAD_ERROR;
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}
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if (phdr->offset + phdr->filesz > kernel_size) {
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return EFI_LOAD_ERROR;
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}
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segment_base = phdr->paddr;
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page_count = (phdr->memsz + 0xfffULL) >> 12;
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status = system_table->boot_services->allocate_pages(
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EFI_ALLOCATE_ADDRESS,
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EFI_LOADER_DATA,
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page_count,
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&segment_base);
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if (status != EFI_SUCCESS) {
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return status;
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}
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mem_zero((void *)(uintptr_t)phdr->paddr, phdr->memsz);
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mem_copy((void *)(uintptr_t)phdr->paddr,
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(const uint8_t *)kernel_image + phdr->offset,
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phdr->filesz);
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}
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*entry_out = (kernel_entry_fn_t)(uintptr_t)ehdr->entry;
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return EFI_SUCCESS;
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}
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