From 805b3cac1e0cae04d16ab893f5cffb446ec74c9c Mon Sep 17 00:00:00 2001 From: Keerthy Date: Wed, 12 Feb 2020 13:55:03 +0530 Subject: lib: elf: Move the generic elf loading/validating functions to lib Move the generic elf loading/validating functions to lib/ so that they can be re-used and accessed by code existing outside cmd. While at it remove the duplicate static version of load_elf_image_phdr under arch/arm/mach-imx/imx_bootaux.c. Signed-off-by: Keerthy Suggested-by: Simon Goldschmidt Reviewed-by: Simon Goldschmidt --- cmd/Kconfig | 1 + cmd/elf.c | 229 ------------------------------------------------------------ 2 files changed, 1 insertion(+), 229 deletions(-) (limited to 'cmd') diff --git a/cmd/Kconfig b/cmd/Kconfig index 6403bc45a5..faa133da65 100644 --- a/cmd/Kconfig +++ b/cmd/Kconfig @@ -399,6 +399,7 @@ config CMD_ABOOTIMG config CMD_ELF bool "bootelf, bootvx" default y + select LIB_ELF help Boot an ELF/vxWorks image from the memory. diff --git a/cmd/elf.c b/cmd/elf.c index 036be5f443..10e8264d3c 100644 --- a/cmd/elf.c +++ b/cmd/elf.c @@ -18,211 +18,6 @@ #include #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. - */ -static 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; -} - -static 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. - */ -static 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; -} - -static 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; -} - /* Allow ports to override the default behavior */ static unsigned long do_bootelf_exec(ulong (*entry)(int, char * const[]), int argc, char * const argv[]) @@ -238,30 +33,6 @@ static unsigned long do_bootelf_exec(ulong (*entry)(int, char * const[]), return ret; } -/* - * 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; -} - /* Interpreter command to boot an arbitrary ELF image from memory */ int do_bootelf(cmd_tbl_t *cmdtp, int flag, int argc, char * const argv[]) { -- cgit v1.2.3