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1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239 240 241 242 243 244 245 246 | // 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; } |