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// SPDX-License-Identifier: BSD-2-Clause
/*
Copyright (c) 2001 William L. Pitts
*/
#include <common.h>
#include <command.h>
#include <cpu_func.h>
#include <elf.h>
#include <env.h>
#include <net.h>
#include <vxworks.h>
#ifdef CONFIG_X86
#include <vbe.h>
#include <asm/e820.h>
#include <linux/linkage.h>
#endif
/*
* A very simple ELF64 loader, assumes the image is valid, returns the
* entry point address.
*
* Note if U-Boot is 32-bit, the loader assumes the to segment's
* physical address and size is within the lower 32-bit address space.
*/
unsigned long load_elf64_image_phdr(unsigned long addr)
{
Elf64_Ehdr *ehdr; /* Elf header structure pointer */
Elf64_Phdr *phdr; /* Program header structure pointer */
int i;
ehdr = (Elf64_Ehdr *)addr;
phdr = (Elf64_Phdr *)(addr + (ulong)ehdr->e_phoff);
/* Load each program header */
for (i = 0; i < ehdr->e_phnum; ++i) {
void *dst = (void *)(ulong)phdr->p_paddr;
void *src = (void *)addr + phdr->p_offset;
debug("Loading phdr %i to 0x%p (%lu bytes)\n",
i, dst, (ulong)phdr->p_filesz);
if (phdr->p_filesz)
memcpy(dst, src, phdr->p_filesz);
if (phdr->p_filesz != phdr->p_memsz)
memset(dst + phdr->p_filesz, 0x00,
phdr->p_memsz - phdr->p_filesz);
flush_cache(rounddown((unsigned long)dst, ARCH_DMA_MINALIGN),
roundup(phdr->p_memsz, ARCH_DMA_MINALIGN));
++phdr;
}
if (ehdr->e_machine == EM_PPC64 && (ehdr->e_flags &
EF_PPC64_ELFV1_ABI)) {
/*
* For the 64-bit PowerPC ELF V1 ABI, e_entry is a function
* descriptor pointer with the first double word being the
* address of the entry point of the function.
*/
uintptr_t addr = ehdr->e_entry;
return *(Elf64_Addr *)addr;
}
return ehdr->e_entry;
}
unsigned long load_elf64_image_shdr(unsigned long addr)
{
Elf64_Ehdr *ehdr; /* Elf header structure pointer */
Elf64_Shdr *shdr; /* Section header structure pointer */
unsigned char *strtab = 0; /* String table pointer */
unsigned char *image; /* Binary image pointer */
int i; /* Loop counter */
ehdr = (Elf64_Ehdr *)addr;
/* Find the section header string table for output info */
shdr = (Elf64_Shdr *)(addr + (ulong)ehdr->e_shoff +
(ehdr->e_shstrndx * sizeof(Elf64_Shdr)));
if (shdr->sh_type == SHT_STRTAB)
strtab = (unsigned char *)(addr + (ulong)shdr->sh_offset);
/* Load each appropriate section */
for (i = 0; i < ehdr->e_shnum; ++i) {
shdr = (Elf64_Shdr *)(addr + (ulong)ehdr->e_shoff +
(i * sizeof(Elf64_Shdr)));
if (!(shdr->sh_flags & SHF_ALLOC) ||
shdr->sh_addr == 0 || shdr->sh_size == 0) {
continue;
}
if (strtab) {
debug("%sing %s @ 0x%08lx (%ld bytes)\n",
(shdr->sh_type == SHT_NOBITS) ? "Clear" : "Load",
&strtab[shdr->sh_name],
(unsigned long)shdr->sh_addr,
(long)shdr->sh_size);
}
if (shdr->sh_type == SHT_NOBITS) {
memset((void *)(uintptr_t)shdr->sh_addr, 0,
shdr->sh_size);
} else {
image = (unsigned char *)addr + (ulong)shdr->sh_offset;
memcpy((void *)(uintptr_t)shdr->sh_addr,
(const void *)image, shdr->sh_size);
}
flush_cache(rounddown(shdr->sh_addr, ARCH_DMA_MINALIGN),
roundup((shdr->sh_addr + shdr->sh_size),
ARCH_DMA_MINALIGN) -
rounddown(shdr->sh_addr, ARCH_DMA_MINALIGN));
}
if (ehdr->e_machine == EM_PPC64 && (ehdr->e_flags &
EF_PPC64_ELFV1_ABI)) {
/*
* For the 64-bit PowerPC ELF V1 ABI, e_entry is a function
* descriptor pointer with the first double word being the
* address of the entry point of the function.
*/
uintptr_t addr = ehdr->e_entry;
return *(Elf64_Addr *)addr;
}
return ehdr->e_entry;
}
/*
* A very simple ELF loader, assumes the image is valid, returns the
* entry point address.
*
* The loader firstly reads the EFI class to see if it's a 64-bit image.
* If yes, call the ELF64 loader. Otherwise continue with the ELF32 loader.
*/
unsigned long load_elf_image_phdr(unsigned long addr)
{
Elf32_Ehdr *ehdr; /* Elf header structure pointer */
Elf32_Phdr *phdr; /* Program header structure pointer */
int i;
ehdr = (Elf32_Ehdr *)addr;
if (ehdr->e_ident[EI_CLASS] == ELFCLASS64)
return load_elf64_image_phdr(addr);
phdr = (Elf32_Phdr *)(addr + ehdr->e_phoff);
/* Load each program header */
for (i = 0; i < ehdr->e_phnum; ++i) {
void *dst = (void *)(uintptr_t)phdr->p_paddr;
void *src = (void *)addr + phdr->p_offset;
debug("Loading phdr %i to 0x%p (%i bytes)\n",
i, dst, phdr->p_filesz);
if (phdr->p_filesz)
memcpy(dst, src, phdr->p_filesz);
if (phdr->p_filesz != phdr->p_memsz)
memset(dst + phdr->p_filesz, 0x00,
phdr->p_memsz - phdr->p_filesz);
flush_cache(rounddown((unsigned long)dst, ARCH_DMA_MINALIGN),
roundup(phdr->p_memsz, ARCH_DMA_MINALIGN));
++phdr;
}
return ehdr->e_entry;
}
unsigned long load_elf_image_shdr(unsigned long addr)
{
Elf32_Ehdr *ehdr; /* Elf header structure pointer */
Elf32_Shdr *shdr; /* Section header structure pointer */
unsigned char *strtab = 0; /* String table pointer */
unsigned char *image; /* Binary image pointer */
int i; /* Loop counter */
ehdr = (Elf32_Ehdr *)addr;
if (ehdr->e_ident[EI_CLASS] == ELFCLASS64)
return load_elf64_image_shdr(addr);
/* Find the section header string table for output info */
shdr = (Elf32_Shdr *)(addr + ehdr->e_shoff +
(ehdr->e_shstrndx * sizeof(Elf32_Shdr)));
if (shdr->sh_type == SHT_STRTAB)
strtab = (unsigned char *)(addr + shdr->sh_offset);
/* Load each appropriate section */
for (i = 0; i < ehdr->e_shnum; ++i) {
shdr = (Elf32_Shdr *)(addr + ehdr->e_shoff +
(i * sizeof(Elf32_Shdr)));
if (!(shdr->sh_flags & SHF_ALLOC) ||
shdr->sh_addr == 0 || shdr->sh_size == 0) {
continue;
}
if (strtab) {
debug("%sing %s @ 0x%08lx (%ld bytes)\n",
(shdr->sh_type == SHT_NOBITS) ? "Clear" : "Load",
&strtab[shdr->sh_name],
(unsigned long)shdr->sh_addr,
(long)shdr->sh_size);
}
if (shdr->sh_type == SHT_NOBITS) {
memset((void *)(uintptr_t)shdr->sh_addr, 0,
shdr->sh_size);
} else {
image = (unsigned char *)addr + shdr->sh_offset;
memcpy((void *)(uintptr_t)shdr->sh_addr,
(const void *)image, shdr->sh_size);
}
flush_cache(rounddown(shdr->sh_addr, ARCH_DMA_MINALIGN),
roundup((shdr->sh_addr + shdr->sh_size),
ARCH_DMA_MINALIGN) -
rounddown(shdr->sh_addr, ARCH_DMA_MINALIGN));
}
return ehdr->e_entry;
}
/*
* Determine if a valid ELF image exists at the given memory location.
* First look at the ELF header magic field, then make sure that it is
* executable.
*/
int valid_elf_image(unsigned long addr)
{
Elf32_Ehdr *ehdr; /* Elf header structure pointer */
ehdr = (Elf32_Ehdr *)addr;
if (!IS_ELF(*ehdr)) {
printf("## No elf image at address 0x%08lx\n", addr);
return 0;
}
if (ehdr->e_type != ET_EXEC) {
printf("## Not a 32-bit elf image at address 0x%08lx\n", addr);
return 0;
}
return 1;
}
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