Warner Losh | 310df05 | 2021-08-06 12:05:02 -0600 | [diff] [blame] | 1 | /* |
| 2 | * ELF loading code |
| 3 | * |
| 4 | * Copyright (c) 2013 Stacey D. Son |
| 5 | * |
| 6 | * This program is free software; you can redistribute it and/or modify |
| 7 | * it under the terms of the GNU General Public License as published by |
| 8 | * the Free Software Foundation; either version 2 of the License, or |
| 9 | * (at your option) any later version. |
| 10 | * |
| 11 | * This program is distributed in the hope that it will be useful, |
| 12 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 13 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 14 | * GNU General Public License for more details. |
| 15 | * |
| 16 | * You should have received a copy of the GNU General Public License |
| 17 | * along with this program; if not, see <http://www.gnu.org/licenses/>. |
| 18 | */ |
blueswir1 | 8477850 | 2008-10-26 20:33:16 +0000 | [diff] [blame] | 19 | |
Peter Maydell | 2231197 | 2016-01-29 17:49:53 +0000 | [diff] [blame] | 20 | #include "qemu/osdep.h" |
blueswir1 | 8477850 | 2008-10-26 20:33:16 +0000 | [diff] [blame] | 21 | |
| 22 | #include "qemu.h" |
Paolo Bonzini | 76cad71 | 2012-10-24 11:12:21 +0200 | [diff] [blame] | 23 | #include "disas/disas.h" |
Veronia Bahaa | f348b6d | 2016-03-20 19:16:19 +0200 | [diff] [blame] | 24 | #include "qemu/path.h" |
blueswir1 | 8477850 | 2008-10-26 20:33:16 +0000 | [diff] [blame] | 25 | |
Warner Losh | 98b34d3 | 2021-08-04 17:13:24 -0600 | [diff] [blame] | 26 | static abi_ulong target_auxents; /* Where the AUX entries are in target */ |
| 27 | static size_t target_auxents_sz; /* Size of AUX entries including AT_NULL */ |
| 28 | |
Warner Losh | 0475f8f | 2021-08-06 14:20:16 -0600 | [diff] [blame] | 29 | #include "target_arch_reg.h" |
Warner Losh | 98b34d3 | 2021-08-04 17:13:24 -0600 | [diff] [blame] | 30 | #include "target_os_elf.h" |
| 31 | #include "target_os_stack.h" |
Warner Losh | a8fe6d5 | 2021-08-03 22:04:20 -0600 | [diff] [blame] | 32 | #include "target_os_thread.h" |
Warner Losh | 0475f8f | 2021-08-06 14:20:16 -0600 | [diff] [blame] | 33 | #include "target_os_user.h" |
blueswir1 | 8477850 | 2008-10-26 20:33:16 +0000 | [diff] [blame] | 34 | |
Warner Losh | 98b34d3 | 2021-08-04 17:13:24 -0600 | [diff] [blame] | 35 | abi_ulong target_stksiz; |
| 36 | abi_ulong target_stkbas; |
blueswir1 | 8477850 | 2008-10-26 20:33:16 +0000 | [diff] [blame] | 37 | |
Warner Losh | 0475f8f | 2021-08-06 14:20:16 -0600 | [diff] [blame] | 38 | static int elf_core_dump(int signr, CPUArchState *env); |
Warner Losh | c09f12f | 2021-08-06 17:12:24 -0600 | [diff] [blame] | 39 | static int load_elf_sections(const struct elfhdr *hdr, struct elf_phdr *phdr, |
| 40 | int fd, abi_ulong rbase, abi_ulong *baddrp); |
Warner Losh | 0475f8f | 2021-08-06 14:20:16 -0600 | [diff] [blame] | 41 | |
Warner Losh | b4bebee | 2021-04-23 09:05:57 -0600 | [diff] [blame] | 42 | static inline void memcpy_fromfs(void *to, const void *from, unsigned long n) |
blueswir1 | 8477850 | 2008-10-26 20:33:16 +0000 | [diff] [blame] | 43 | { |
Warner Losh | b62f790 | 2021-08-02 22:59:12 -0600 | [diff] [blame] | 44 | memcpy(to, from, n); |
blueswir1 | 8477850 | 2008-10-26 20:33:16 +0000 | [diff] [blame] | 45 | } |
| 46 | |
blueswir1 | 8477850 | 2008-10-26 20:33:16 +0000 | [diff] [blame] | 47 | #ifdef BSWAP_NEEDED |
| 48 | static void bswap_ehdr(struct elfhdr *ehdr) |
| 49 | { |
Warner Losh | b62f790 | 2021-08-02 22:59:12 -0600 | [diff] [blame] | 50 | bswap16s(&ehdr->e_type); /* Object file type */ |
blueswir1 | 8477850 | 2008-10-26 20:33:16 +0000 | [diff] [blame] | 51 | bswap16s(&ehdr->e_machine); /* Architecture */ |
| 52 | bswap32s(&ehdr->e_version); /* Object file version */ |
| 53 | bswaptls(&ehdr->e_entry); /* Entry point virtual address */ |
| 54 | bswaptls(&ehdr->e_phoff); /* Program header table file offset */ |
| 55 | bswaptls(&ehdr->e_shoff); /* Section header table file offset */ |
| 56 | bswap32s(&ehdr->e_flags); /* Processor-specific flags */ |
| 57 | bswap16s(&ehdr->e_ehsize); /* ELF header size in bytes */ |
Warner Losh | b62f790 | 2021-08-02 22:59:12 -0600 | [diff] [blame] | 58 | bswap16s(&ehdr->e_phentsize); /* Program header table entry size */ |
blueswir1 | 8477850 | 2008-10-26 20:33:16 +0000 | [diff] [blame] | 59 | bswap16s(&ehdr->e_phnum); /* Program header table entry count */ |
Warner Losh | b62f790 | 2021-08-02 22:59:12 -0600 | [diff] [blame] | 60 | bswap16s(&ehdr->e_shentsize); /* Section header table entry size */ |
blueswir1 | 8477850 | 2008-10-26 20:33:16 +0000 | [diff] [blame] | 61 | bswap16s(&ehdr->e_shnum); /* Section header table entry count */ |
Warner Losh | b62f790 | 2021-08-02 22:59:12 -0600 | [diff] [blame] | 62 | bswap16s(&ehdr->e_shstrndx); /* Section header string table index */ |
blueswir1 | 8477850 | 2008-10-26 20:33:16 +0000 | [diff] [blame] | 63 | } |
| 64 | |
Warner Losh | b62f790 | 2021-08-02 22:59:12 -0600 | [diff] [blame] | 65 | static void bswap_phdr(struct elf_phdr *phdr, int phnum) |
blueswir1 | 8477850 | 2008-10-26 20:33:16 +0000 | [diff] [blame] | 66 | { |
Warner Losh | b62f790 | 2021-08-02 22:59:12 -0600 | [diff] [blame] | 67 | int i; |
| 68 | |
| 69 | for (i = 0; i < phnum; i++, phdr++) { |
| 70 | bswap32s(&phdr->p_type); /* Segment type */ |
| 71 | bswap32s(&phdr->p_flags); /* Segment flags */ |
| 72 | bswaptls(&phdr->p_offset); /* Segment file offset */ |
| 73 | bswaptls(&phdr->p_vaddr); /* Segment virtual address */ |
| 74 | bswaptls(&phdr->p_paddr); /* Segment physical address */ |
| 75 | bswaptls(&phdr->p_filesz); /* Segment size in file */ |
| 76 | bswaptls(&phdr->p_memsz); /* Segment size in memory */ |
| 77 | bswaptls(&phdr->p_align); /* Segment alignment */ |
| 78 | } |
blueswir1 | 8477850 | 2008-10-26 20:33:16 +0000 | [diff] [blame] | 79 | } |
| 80 | |
Warner Losh | b62f790 | 2021-08-02 22:59:12 -0600 | [diff] [blame] | 81 | static void bswap_shdr(struct elf_shdr *shdr, int shnum) |
blueswir1 | 8477850 | 2008-10-26 20:33:16 +0000 | [diff] [blame] | 82 | { |
Warner Losh | b62f790 | 2021-08-02 22:59:12 -0600 | [diff] [blame] | 83 | int i; |
| 84 | |
| 85 | for (i = 0; i < shnum; i++, shdr++) { |
| 86 | bswap32s(&shdr->sh_name); |
| 87 | bswap32s(&shdr->sh_type); |
| 88 | bswaptls(&shdr->sh_flags); |
| 89 | bswaptls(&shdr->sh_addr); |
| 90 | bswaptls(&shdr->sh_offset); |
| 91 | bswaptls(&shdr->sh_size); |
| 92 | bswap32s(&shdr->sh_link); |
| 93 | bswap32s(&shdr->sh_info); |
| 94 | bswaptls(&shdr->sh_addralign); |
| 95 | bswaptls(&shdr->sh_entsize); |
| 96 | } |
blueswir1 | 8477850 | 2008-10-26 20:33:16 +0000 | [diff] [blame] | 97 | } |
| 98 | |
| 99 | static void bswap_sym(struct elf_sym *sym) |
| 100 | { |
| 101 | bswap32s(&sym->st_name); |
| 102 | bswaptls(&sym->st_value); |
| 103 | bswaptls(&sym->st_size); |
| 104 | bswap16s(&sym->st_shndx); |
| 105 | } |
Warner Losh | b62f790 | 2021-08-02 22:59:12 -0600 | [diff] [blame] | 106 | |
Warner Losh | 0475f8f | 2021-08-06 14:20:16 -0600 | [diff] [blame] | 107 | static void bswap_note(struct elf_note *en) |
| 108 | { |
| 109 | bswap32s(&en->n_namesz); |
| 110 | bswap32s(&en->n_descsz); |
| 111 | bswap32s(&en->n_type); |
| 112 | } |
| 113 | |
Warner Losh | b62f790 | 2021-08-02 22:59:12 -0600 | [diff] [blame] | 114 | #else /* ! BSWAP_NEEDED */ |
| 115 | |
| 116 | static void bswap_ehdr(struct elfhdr *ehdr) { } |
| 117 | static void bswap_phdr(struct elf_phdr *phdr, int phnum) { } |
| 118 | static void bswap_shdr(struct elf_shdr *shdr, int shnum) { } |
| 119 | static void bswap_sym(struct elf_sym *sym) { } |
Warner Losh | 0475f8f | 2021-08-06 14:20:16 -0600 | [diff] [blame] | 120 | static void bswap_note(struct elf_note *en) { } |
Warner Losh | b62f790 | 2021-08-02 22:59:12 -0600 | [diff] [blame] | 121 | |
| 122 | #endif /* ! BSWAP_NEEDED */ |
blueswir1 | 8477850 | 2008-10-26 20:33:16 +0000 | [diff] [blame] | 123 | |
Warner Losh | 0475f8f | 2021-08-06 14:20:16 -0600 | [diff] [blame] | 124 | #include "elfcore.c" |
| 125 | |
blueswir1 | 8477850 | 2008-10-26 20:33:16 +0000 | [diff] [blame] | 126 | /* |
| 127 | * 'copy_elf_strings()' copies argument/envelope strings from user |
| 128 | * memory to free pages in kernel mem. These are in a format ready |
| 129 | * to be put directly into the top of new user memory. |
| 130 | * |
| 131 | */ |
Warner Losh | b4bebee | 2021-04-23 09:05:57 -0600 | [diff] [blame] | 132 | static abi_ulong copy_elf_strings(int argc, char **argv, void **page, |
blueswir1 | 8477850 | 2008-10-26 20:33:16 +0000 | [diff] [blame] | 133 | abi_ulong p) |
| 134 | { |
| 135 | char *tmp, *tmp1, *pag = NULL; |
| 136 | int len, offset = 0; |
| 137 | |
| 138 | if (!p) { |
| 139 | return 0; /* bullet-proofing */ |
| 140 | } |
| 141 | while (argc-- > 0) { |
| 142 | tmp = argv[argc]; |
| 143 | if (!tmp) { |
Peter Maydell | 9bb9318 | 2014-06-02 13:24:37 +0100 | [diff] [blame] | 144 | fprintf(stderr, "VFS: argc is wrong"); |
blueswir1 | 8477850 | 2008-10-26 20:33:16 +0000 | [diff] [blame] | 145 | exit(-1); |
| 146 | } |
| 147 | tmp1 = tmp; |
Warner Losh | 0456a17 | 2021-08-06 14:38:48 -0600 | [diff] [blame] | 148 | while (*tmp++) { |
| 149 | continue; |
| 150 | } |
blueswir1 | 8477850 | 2008-10-26 20:33:16 +0000 | [diff] [blame] | 151 | len = tmp - tmp1; |
| 152 | if (p < len) { /* this shouldn't happen - 128kB */ |
Warner Losh | 0456a17 | 2021-08-06 14:38:48 -0600 | [diff] [blame] | 153 | return 0; |
blueswir1 | 8477850 | 2008-10-26 20:33:16 +0000 | [diff] [blame] | 154 | } |
| 155 | while (len) { |
| 156 | --p; --tmp; --len; |
| 157 | if (--offset < 0) { |
| 158 | offset = p % TARGET_PAGE_SIZE; |
Warner Losh | b4bebee | 2021-04-23 09:05:57 -0600 | [diff] [blame] | 159 | pag = (char *)page[p / TARGET_PAGE_SIZE]; |
blueswir1 | 8477850 | 2008-10-26 20:33:16 +0000 | [diff] [blame] | 160 | if (!pag) { |
Stefan Weil | c580dee | 2011-11-21 21:06:22 +0100 | [diff] [blame] | 161 | pag = g_try_malloc0(TARGET_PAGE_SIZE); |
Warner Losh | b4bebee | 2021-04-23 09:05:57 -0600 | [diff] [blame] | 162 | page[p / TARGET_PAGE_SIZE] = pag; |
Warner Losh | 0456a17 | 2021-08-06 14:38:48 -0600 | [diff] [blame] | 163 | if (!pag) { |
blueswir1 | 8477850 | 2008-10-26 20:33:16 +0000 | [diff] [blame] | 164 | return 0; |
Warner Losh | 0456a17 | 2021-08-06 14:38:48 -0600 | [diff] [blame] | 165 | } |
blueswir1 | 8477850 | 2008-10-26 20:33:16 +0000 | [diff] [blame] | 166 | } |
| 167 | } |
| 168 | if (len == 0 || offset == 0) { |
| 169 | *(pag + offset) = *tmp; |
Warner Losh | 0456a17 | 2021-08-06 14:38:48 -0600 | [diff] [blame] | 170 | } else { |
blueswir1 | 8477850 | 2008-10-26 20:33:16 +0000 | [diff] [blame] | 171 | int bytes_to_copy = (len > offset) ? offset : len; |
| 172 | tmp -= bytes_to_copy; |
| 173 | p -= bytes_to_copy; |
| 174 | offset -= bytes_to_copy; |
| 175 | len -= bytes_to_copy; |
| 176 | memcpy_fromfs(pag + offset, tmp, bytes_to_copy + 1); |
| 177 | } |
| 178 | } |
| 179 | } |
| 180 | return p; |
| 181 | } |
| 182 | |
Warner Losh | 98b34d3 | 2021-08-04 17:13:24 -0600 | [diff] [blame] | 183 | static void setup_arg_pages(struct bsd_binprm *bprm, struct image_info *info, |
| 184 | abi_ulong *stackp, abi_ulong *stringp) |
blueswir1 | 8477850 | 2008-10-26 20:33:16 +0000 | [diff] [blame] | 185 | { |
Warner Losh | 98b34d3 | 2021-08-04 17:13:24 -0600 | [diff] [blame] | 186 | abi_ulong stack_base, size; |
| 187 | abi_long addr; |
blueswir1 | 8477850 | 2008-10-26 20:33:16 +0000 | [diff] [blame] | 188 | |
Warner Losh | 0456a17 | 2021-08-06 14:38:48 -0600 | [diff] [blame] | 189 | /* |
| 190 | * Create enough stack to hold everything. If we don't use it for args, |
| 191 | * we'll use it for something else... |
blueswir1 | 8477850 | 2008-10-26 20:33:16 +0000 | [diff] [blame] | 192 | */ |
Warner Losh | 312a0b1 | 2021-08-06 18:48:37 -0600 | [diff] [blame] | 193 | size = target_dflssiz; |
Warner Losh | 98b34d3 | 2021-08-04 17:13:24 -0600 | [diff] [blame] | 194 | stack_base = TARGET_USRSTACK - size; |
Warner Losh | 0456a17 | 2021-08-06 14:38:48 -0600 | [diff] [blame] | 195 | addr = target_mmap(stack_base , size + qemu_host_page_size, |
| 196 | PROT_READ | PROT_WRITE, MAP_PRIVATE | MAP_ANON, -1, 0); |
Warner Losh | 98b34d3 | 2021-08-04 17:13:24 -0600 | [diff] [blame] | 197 | if (addr == -1) { |
blueswir1 | 8477850 | 2008-10-26 20:33:16 +0000 | [diff] [blame] | 198 | perror("stk mmap"); |
| 199 | exit(-1); |
| 200 | } |
| 201 | /* we reserve one extra page at the top of the stack as guard */ |
Warner Losh | 98b34d3 | 2021-08-04 17:13:24 -0600 | [diff] [blame] | 202 | target_mprotect(addr + size, qemu_host_page_size, PROT_NONE); |
blueswir1 | 8477850 | 2008-10-26 20:33:16 +0000 | [diff] [blame] | 203 | |
Warner Losh | 98b34d3 | 2021-08-04 17:13:24 -0600 | [diff] [blame] | 204 | target_stksiz = size; |
| 205 | target_stkbas = addr; |
blueswir1 | 8477850 | 2008-10-26 20:33:16 +0000 | [diff] [blame] | 206 | |
Warner Losh | 98b34d3 | 2021-08-04 17:13:24 -0600 | [diff] [blame] | 207 | if (setup_initial_stack(bprm, stackp, stringp) != 0) { |
| 208 | perror("stk setup"); |
| 209 | exit(-1); |
blueswir1 | 8477850 | 2008-10-26 20:33:16 +0000 | [diff] [blame] | 210 | } |
blueswir1 | 8477850 | 2008-10-26 20:33:16 +0000 | [diff] [blame] | 211 | } |
| 212 | |
| 213 | static void set_brk(abi_ulong start, abi_ulong end) |
| 214 | { |
Warner Losh | 0456a17 | 2021-08-06 14:38:48 -0600 | [diff] [blame] | 215 | /* page-align the start and end addresses... */ |
| 216 | start = HOST_PAGE_ALIGN(start); |
| 217 | end = HOST_PAGE_ALIGN(end); |
| 218 | if (end <= start) { |
| 219 | return; |
| 220 | } |
| 221 | if (target_mmap(start, end - start, PROT_READ | PROT_WRITE | PROT_EXEC, |
| 222 | MAP_FIXED | MAP_PRIVATE | MAP_ANON, -1, 0) == -1) { |
| 223 | perror("cannot mmap brk"); |
| 224 | exit(-1); |
| 225 | } |
blueswir1 | 8477850 | 2008-10-26 20:33:16 +0000 | [diff] [blame] | 226 | } |
| 227 | |
| 228 | |
Warner Losh | 0456a17 | 2021-08-06 14:38:48 -0600 | [diff] [blame] | 229 | /* |
| 230 | * We need to explicitly zero any fractional pages after the data |
| 231 | * section (i.e. bss). This would contain the junk from the file that |
| 232 | * should not be in memory. |
| 233 | */ |
blueswir1 | 8477850 | 2008-10-26 20:33:16 +0000 | [diff] [blame] | 234 | static void padzero(abi_ulong elf_bss, abi_ulong last_bss) |
| 235 | { |
Warner Losh | 0456a17 | 2021-08-06 14:38:48 -0600 | [diff] [blame] | 236 | abi_ulong nbyte; |
blueswir1 | 8477850 | 2008-10-26 20:33:16 +0000 | [diff] [blame] | 237 | |
Warner Losh | 0456a17 | 2021-08-06 14:38:48 -0600 | [diff] [blame] | 238 | if (elf_bss >= last_bss) { |
| 239 | return; |
| 240 | } |
blueswir1 | 8477850 | 2008-10-26 20:33:16 +0000 | [diff] [blame] | 241 | |
Warner Losh | 0456a17 | 2021-08-06 14:38:48 -0600 | [diff] [blame] | 242 | /* |
| 243 | * XXX: this is really a hack : if the real host page size is |
| 244 | * smaller than the target page size, some pages after the end |
| 245 | * of the file may not be mapped. A better fix would be to |
| 246 | * patch target_mmap(), but it is more complicated as the file |
| 247 | * size must be known. |
| 248 | */ |
Marc-André Lureau | 8e3b0cb | 2022-03-23 19:57:22 +0400 | [diff] [blame] | 249 | if (qemu_real_host_page_size() < qemu_host_page_size) { |
Warner Losh | 0456a17 | 2021-08-06 14:38:48 -0600 | [diff] [blame] | 250 | abi_ulong end_addr, end_addr1; |
| 251 | end_addr1 = REAL_HOST_PAGE_ALIGN(elf_bss); |
| 252 | end_addr = HOST_PAGE_ALIGN(elf_bss); |
| 253 | if (end_addr1 < end_addr) { |
| 254 | mmap((void *)g2h_untagged(end_addr1), end_addr - end_addr1, |
| 255 | PROT_READ | PROT_WRITE | PROT_EXEC, |
| 256 | MAP_FIXED | MAP_PRIVATE | MAP_ANON, -1, 0); |
blueswir1 | 8477850 | 2008-10-26 20:33:16 +0000 | [diff] [blame] | 257 | } |
Warner Losh | 0456a17 | 2021-08-06 14:38:48 -0600 | [diff] [blame] | 258 | } |
blueswir1 | 8477850 | 2008-10-26 20:33:16 +0000 | [diff] [blame] | 259 | |
Warner Losh | 0456a17 | 2021-08-06 14:38:48 -0600 | [diff] [blame] | 260 | nbyte = elf_bss & (qemu_host_page_size - 1); |
| 261 | if (nbyte) { |
| 262 | nbyte = qemu_host_page_size - nbyte; |
| 263 | do { |
| 264 | /* FIXME - what to do if put_user() fails? */ |
| 265 | put_user_u8(0, elf_bss); |
| 266 | elf_bss++; |
| 267 | } while (--nbyte); |
| 268 | } |
blueswir1 | 8477850 | 2008-10-26 20:33:16 +0000 | [diff] [blame] | 269 | } |
| 270 | |
Warner Losh | b4bebee | 2021-04-23 09:05:57 -0600 | [diff] [blame] | 271 | static abi_ulong load_elf_interp(struct elfhdr *interp_elf_ex, |
blueswir1 | 8477850 | 2008-10-26 20:33:16 +0000 | [diff] [blame] | 272 | int interpreter_fd, |
| 273 | abi_ulong *interp_load_addr) |
| 274 | { |
Warner Losh | b4bebee | 2021-04-23 09:05:57 -0600 | [diff] [blame] | 275 | struct elf_phdr *elf_phdata = NULL; |
Warner Losh | c09f12f | 2021-08-06 17:12:24 -0600 | [diff] [blame] | 276 | abi_ulong rbase; |
Warner Losh | b4bebee | 2021-04-23 09:05:57 -0600 | [diff] [blame] | 277 | int retval; |
Warner Losh | c09f12f | 2021-08-06 17:12:24 -0600 | [diff] [blame] | 278 | abi_ulong baddr, error; |
blueswir1 | 8477850 | 2008-10-26 20:33:16 +0000 | [diff] [blame] | 279 | |
Warner Losh | b4bebee | 2021-04-23 09:05:57 -0600 | [diff] [blame] | 280 | error = 0; |
blueswir1 | 8477850 | 2008-10-26 20:33:16 +0000 | [diff] [blame] | 281 | |
Warner Losh | b4bebee | 2021-04-23 09:05:57 -0600 | [diff] [blame] | 282 | bswap_ehdr(interp_elf_ex); |
Warner Losh | b4bebee | 2021-04-23 09:05:57 -0600 | [diff] [blame] | 283 | /* First of all, some simple consistency checks */ |
Warner Losh | 0456a17 | 2021-08-06 14:38:48 -0600 | [diff] [blame] | 284 | if ((interp_elf_ex->e_type != ET_EXEC && interp_elf_ex->e_type != ET_DYN) || |
| 285 | !elf_check_arch(interp_elf_ex->e_machine)) { |
Warner Losh | b4bebee | 2021-04-23 09:05:57 -0600 | [diff] [blame] | 286 | return ~((abi_ulong)0UL); |
| 287 | } |
blueswir1 | 8477850 | 2008-10-26 20:33:16 +0000 | [diff] [blame] | 288 | |
| 289 | |
Warner Losh | b4bebee | 2021-04-23 09:05:57 -0600 | [diff] [blame] | 290 | /* Now read in all of the header information */ |
Warner Losh | 0456a17 | 2021-08-06 14:38:48 -0600 | [diff] [blame] | 291 | if (sizeof(struct elf_phdr) * interp_elf_ex->e_phnum > TARGET_PAGE_SIZE) { |
Warner Losh | b4bebee | 2021-04-23 09:05:57 -0600 | [diff] [blame] | 292 | return ~(abi_ulong)0UL; |
Warner Losh | 0456a17 | 2021-08-06 14:38:48 -0600 | [diff] [blame] | 293 | } |
blueswir1 | 8477850 | 2008-10-26 20:33:16 +0000 | [diff] [blame] | 294 | |
Warner Losh | 0456a17 | 2021-08-06 14:38:48 -0600 | [diff] [blame] | 295 | elf_phdata = (struct elf_phdr *) malloc(sizeof(struct elf_phdr) * |
| 296 | interp_elf_ex->e_phnum); |
blueswir1 | 8477850 | 2008-10-26 20:33:16 +0000 | [diff] [blame] | 297 | |
Warner Losh | 0456a17 | 2021-08-06 14:38:48 -0600 | [diff] [blame] | 298 | if (!elf_phdata) { |
Warner Losh | b4bebee | 2021-04-23 09:05:57 -0600 | [diff] [blame] | 299 | return ~((abi_ulong)0UL); |
Warner Losh | 0456a17 | 2021-08-06 14:38:48 -0600 | [diff] [blame] | 300 | } |
blueswir1 | 8477850 | 2008-10-26 20:33:16 +0000 | [diff] [blame] | 301 | |
Warner Losh | b4bebee | 2021-04-23 09:05:57 -0600 | [diff] [blame] | 302 | /* |
| 303 | * If the size of this structure has changed, then punt, since |
| 304 | * we will be doing the wrong thing. |
| 305 | */ |
| 306 | if (interp_elf_ex->e_phentsize != sizeof(struct elf_phdr)) { |
| 307 | free(elf_phdata); |
| 308 | return ~((abi_ulong)0UL); |
| 309 | } |
blueswir1 | 8477850 | 2008-10-26 20:33:16 +0000 | [diff] [blame] | 310 | |
Warner Losh | b4bebee | 2021-04-23 09:05:57 -0600 | [diff] [blame] | 311 | retval = lseek(interpreter_fd, interp_elf_ex->e_phoff, SEEK_SET); |
| 312 | if (retval >= 0) { |
Warner Losh | 0456a17 | 2021-08-06 14:38:48 -0600 | [diff] [blame] | 313 | retval = read(interpreter_fd, (char *) elf_phdata, |
| 314 | sizeof(struct elf_phdr) * interp_elf_ex->e_phnum); |
Warner Losh | b4bebee | 2021-04-23 09:05:57 -0600 | [diff] [blame] | 315 | } |
| 316 | if (retval < 0) { |
| 317 | perror("load_elf_interp"); |
| 318 | exit(-1); |
Warner Losh | ffa0366 | 2021-04-30 08:17:23 -0600 | [diff] [blame] | 319 | free(elf_phdata); |
Warner Losh | b4bebee | 2021-04-23 09:05:57 -0600 | [diff] [blame] | 320 | return retval; |
| 321 | } |
Warner Losh | b62f790 | 2021-08-02 22:59:12 -0600 | [diff] [blame] | 322 | bswap_phdr(elf_phdata, interp_elf_ex->e_phnum); |
blueswir1 | 8477850 | 2008-10-26 20:33:16 +0000 | [diff] [blame] | 323 | |
Warner Losh | c09f12f | 2021-08-06 17:12:24 -0600 | [diff] [blame] | 324 | rbase = 0; |
Warner Losh | b4bebee | 2021-04-23 09:05:57 -0600 | [diff] [blame] | 325 | if (interp_elf_ex->e_type == ET_DYN) { |
Warner Losh | 0456a17 | 2021-08-06 14:38:48 -0600 | [diff] [blame] | 326 | /* |
| 327 | * In order to avoid hardcoding the interpreter load |
| 328 | * address in qemu, we allocate a big enough memory zone. |
| 329 | */ |
Warner Losh | c09f12f | 2021-08-06 17:12:24 -0600 | [diff] [blame] | 330 | rbase = target_mmap(0, INTERP_MAP_SIZE, PROT_NONE, |
Warner Losh | 0456a17 | 2021-08-06 14:38:48 -0600 | [diff] [blame] | 331 | MAP_PRIVATE | MAP_ANON, -1, 0); |
Warner Losh | c09f12f | 2021-08-06 17:12:24 -0600 | [diff] [blame] | 332 | if (rbase == -1) { |
Warner Losh | b4bebee | 2021-04-23 09:05:57 -0600 | [diff] [blame] | 333 | perror("mmap"); |
| 334 | exit(-1); |
blueswir1 | 8477850 | 2008-10-26 20:33:16 +0000 | [diff] [blame] | 335 | } |
Warner Losh | b4bebee | 2021-04-23 09:05:57 -0600 | [diff] [blame] | 336 | } |
blueswir1 | 8477850 | 2008-10-26 20:33:16 +0000 | [diff] [blame] | 337 | |
Warner Losh | c09f12f | 2021-08-06 17:12:24 -0600 | [diff] [blame] | 338 | error = load_elf_sections(interp_elf_ex, elf_phdata, interpreter_fd, rbase, |
| 339 | &baddr); |
| 340 | if (error != 0) { |
| 341 | perror("load_elf_sections"); |
| 342 | exit(-1); |
| 343 | } |
blueswir1 | 8477850 | 2008-10-26 20:33:16 +0000 | [diff] [blame] | 344 | |
Warner Losh | b4bebee | 2021-04-23 09:05:57 -0600 | [diff] [blame] | 345 | /* Now use mmap to map the library into memory. */ |
Warner Losh | b4bebee | 2021-04-23 09:05:57 -0600 | [diff] [blame] | 346 | close(interpreter_fd); |
Warner Losh | b4bebee | 2021-04-23 09:05:57 -0600 | [diff] [blame] | 347 | free(elf_phdata); |
| 348 | |
Warner Losh | c09f12f | 2021-08-06 17:12:24 -0600 | [diff] [blame] | 349 | *interp_load_addr = baddr; |
| 350 | return ((abi_ulong) interp_elf_ex->e_entry) + rbase; |
blueswir1 | 8477850 | 2008-10-26 20:33:16 +0000 | [diff] [blame] | 351 | } |
| 352 | |
| 353 | static int symfind(const void *s0, const void *s1) |
| 354 | { |
Stefan Weil | c7c530c | 2012-01-05 15:39:39 +0100 | [diff] [blame] | 355 | target_ulong addr = *(target_ulong *)s0; |
blueswir1 | 8477850 | 2008-10-26 20:33:16 +0000 | [diff] [blame] | 356 | struct elf_sym *sym = (struct elf_sym *)s1; |
| 357 | int result = 0; |
Stefan Weil | c7c530c | 2012-01-05 15:39:39 +0100 | [diff] [blame] | 358 | if (addr < sym->st_value) { |
blueswir1 | 8477850 | 2008-10-26 20:33:16 +0000 | [diff] [blame] | 359 | result = -1; |
Stefan Weil | c7c530c | 2012-01-05 15:39:39 +0100 | [diff] [blame] | 360 | } else if (addr >= sym->st_value + sym->st_size) { |
blueswir1 | 8477850 | 2008-10-26 20:33:16 +0000 | [diff] [blame] | 361 | result = 1; |
| 362 | } |
| 363 | return result; |
| 364 | } |
| 365 | |
| 366 | static const char *lookup_symbolxx(struct syminfo *s, target_ulong orig_addr) |
| 367 | { |
| 368 | #if ELF_CLASS == ELFCLASS32 |
| 369 | struct elf_sym *syms = s->disas_symtab.elf32; |
| 370 | #else |
| 371 | struct elf_sym *syms = s->disas_symtab.elf64; |
| 372 | #endif |
| 373 | |
Warner Losh | 0456a17 | 2021-08-06 14:38:48 -0600 | [diff] [blame] | 374 | /* binary search */ |
blueswir1 | 8477850 | 2008-10-26 20:33:16 +0000 | [diff] [blame] | 375 | struct elf_sym *sym; |
| 376 | |
Stefan Weil | c7c530c | 2012-01-05 15:39:39 +0100 | [diff] [blame] | 377 | sym = bsearch(&orig_addr, syms, s->disas_num_syms, sizeof(*syms), symfind); |
Blue Swirl | 7cba04f | 2009-08-01 10:13:20 +0000 | [diff] [blame] | 378 | if (sym != NULL) { |
blueswir1 | 8477850 | 2008-10-26 20:33:16 +0000 | [diff] [blame] | 379 | return s->disas_strtab + sym->st_name; |
| 380 | } |
| 381 | |
| 382 | return ""; |
| 383 | } |
| 384 | |
| 385 | /* FIXME: This should use elf_ops.h */ |
| 386 | static int symcmp(const void *s0, const void *s1) |
| 387 | { |
| 388 | struct elf_sym *sym0 = (struct elf_sym *)s0; |
| 389 | struct elf_sym *sym1 = (struct elf_sym *)s1; |
Warner Losh | 0456a17 | 2021-08-06 14:38:48 -0600 | [diff] [blame] | 390 | return (sym0->st_value < sym1->st_value) ? -1 : |
| 391 | ((sym0->st_value > sym1->st_value) ? 1 : 0); |
blueswir1 | 8477850 | 2008-10-26 20:33:16 +0000 | [diff] [blame] | 392 | } |
| 393 | |
| 394 | /* Best attempt to load symbols from this ELF object. */ |
| 395 | static void load_symbols(struct elfhdr *hdr, int fd) |
| 396 | { |
| 397 | unsigned int i, nsyms; |
| 398 | struct elf_shdr sechdr, symtab, strtab; |
| 399 | char *strings; |
| 400 | struct syminfo *s; |
Stefan Weil | 2971871 | 2011-01-16 16:28:20 +0100 | [diff] [blame] | 401 | struct elf_sym *syms, *new_syms; |
blueswir1 | 8477850 | 2008-10-26 20:33:16 +0000 | [diff] [blame] | 402 | |
| 403 | lseek(fd, hdr->e_shoff, SEEK_SET); |
| 404 | for (i = 0; i < hdr->e_shnum; i++) { |
Warner Losh | 0456a17 | 2021-08-06 14:38:48 -0600 | [diff] [blame] | 405 | if (read(fd, &sechdr, sizeof(sechdr)) != sizeof(sechdr)) { |
blueswir1 | 8477850 | 2008-10-26 20:33:16 +0000 | [diff] [blame] | 406 | return; |
Warner Losh | 0456a17 | 2021-08-06 14:38:48 -0600 | [diff] [blame] | 407 | } |
Warner Losh | b62f790 | 2021-08-02 22:59:12 -0600 | [diff] [blame] | 408 | bswap_shdr(&sechdr, 1); |
blueswir1 | 8477850 | 2008-10-26 20:33:16 +0000 | [diff] [blame] | 409 | if (sechdr.sh_type == SHT_SYMTAB) { |
| 410 | symtab = sechdr; |
Warner Losh | 0456a17 | 2021-08-06 14:38:48 -0600 | [diff] [blame] | 411 | lseek(fd, hdr->e_shoff + sizeof(sechdr) * sechdr.sh_link, |
| 412 | SEEK_SET); |
| 413 | if (read(fd, &strtab, sizeof(strtab)) != sizeof(strtab)) { |
blueswir1 | 8477850 | 2008-10-26 20:33:16 +0000 | [diff] [blame] | 414 | return; |
Warner Losh | 0456a17 | 2021-08-06 14:38:48 -0600 | [diff] [blame] | 415 | } |
Warner Losh | b62f790 | 2021-08-02 22:59:12 -0600 | [diff] [blame] | 416 | bswap_shdr(&strtab, 1); |
blueswir1 | 8477850 | 2008-10-26 20:33:16 +0000 | [diff] [blame] | 417 | goto found; |
| 418 | } |
| 419 | } |
| 420 | return; /* Shouldn't happen... */ |
| 421 | |
Warner Losh | 0456a17 | 2021-08-06 14:38:48 -0600 | [diff] [blame] | 422 | found: |
blueswir1 | 8477850 | 2008-10-26 20:33:16 +0000 | [diff] [blame] | 423 | /* Now know where the strtab and symtab are. Snarf them. */ |
| 424 | s = malloc(sizeof(*s)); |
| 425 | syms = malloc(symtab.sh_size); |
Stefan Weil | 2971871 | 2011-01-16 16:28:20 +0100 | [diff] [blame] | 426 | if (!syms) { |
| 427 | free(s); |
blueswir1 | 8477850 | 2008-10-26 20:33:16 +0000 | [diff] [blame] | 428 | return; |
Stefan Weil | 2971871 | 2011-01-16 16:28:20 +0100 | [diff] [blame] | 429 | } |
blueswir1 | 8477850 | 2008-10-26 20:33:16 +0000 | [diff] [blame] | 430 | s->disas_strtab = strings = malloc(strtab.sh_size); |
Stefan Weil | 2971871 | 2011-01-16 16:28:20 +0100 | [diff] [blame] | 431 | if (!s->disas_strtab) { |
| 432 | free(s); |
| 433 | free(syms); |
blueswir1 | 8477850 | 2008-10-26 20:33:16 +0000 | [diff] [blame] | 434 | return; |
Stefan Weil | 2971871 | 2011-01-16 16:28:20 +0100 | [diff] [blame] | 435 | } |
blueswir1 | 8477850 | 2008-10-26 20:33:16 +0000 | [diff] [blame] | 436 | |
| 437 | lseek(fd, symtab.sh_offset, SEEK_SET); |
Stefan Weil | 2971871 | 2011-01-16 16:28:20 +0100 | [diff] [blame] | 438 | if (read(fd, syms, symtab.sh_size) != symtab.sh_size) { |
| 439 | free(s); |
| 440 | free(syms); |
| 441 | free(strings); |
blueswir1 | 8477850 | 2008-10-26 20:33:16 +0000 | [diff] [blame] | 442 | return; |
Stefan Weil | 2971871 | 2011-01-16 16:28:20 +0100 | [diff] [blame] | 443 | } |
blueswir1 | 8477850 | 2008-10-26 20:33:16 +0000 | [diff] [blame] | 444 | |
| 445 | nsyms = symtab.sh_size / sizeof(struct elf_sym); |
| 446 | |
| 447 | i = 0; |
| 448 | while (i < nsyms) { |
blueswir1 | 8477850 | 2008-10-26 20:33:16 +0000 | [diff] [blame] | 449 | bswap_sym(syms + i); |
Warner Losh | 0456a17 | 2021-08-06 14:38:48 -0600 | [diff] [blame] | 450 | /* Throw away entries which we do not need. */ |
blueswir1 | 8477850 | 2008-10-26 20:33:16 +0000 | [diff] [blame] | 451 | if (syms[i].st_shndx == SHN_UNDEF || |
| 452 | syms[i].st_shndx >= SHN_LORESERVE || |
| 453 | ELF_ST_TYPE(syms[i].st_info) != STT_FUNC) { |
| 454 | nsyms--; |
| 455 | if (i < nsyms) { |
| 456 | syms[i] = syms[nsyms]; |
| 457 | } |
| 458 | continue; |
| 459 | } |
Warner Losh | c09f12f | 2021-08-06 17:12:24 -0600 | [diff] [blame] | 460 | #if defined(TARGET_ARM) || defined(TARGET_MIPS) |
| 461 | /* The bottom address bit marks a Thumb or MIPS16 symbol. */ |
| 462 | syms[i].st_value &= ~(target_ulong)1; |
| 463 | #endif |
blueswir1 | 8477850 | 2008-10-26 20:33:16 +0000 | [diff] [blame] | 464 | i++; |
| 465 | } |
Stefan Weil | 2971871 | 2011-01-16 16:28:20 +0100 | [diff] [blame] | 466 | |
Warner Losh | 0456a17 | 2021-08-06 14:38:48 -0600 | [diff] [blame] | 467 | /* |
| 468 | * Attempt to free the storage associated with the local symbols |
| 469 | * that we threw away. Whether or not this has any effect on the |
| 470 | * memory allocation depends on the malloc implementation and how |
| 471 | * many symbols we managed to discard. |
| 472 | */ |
Stefan Weil | 2971871 | 2011-01-16 16:28:20 +0100 | [diff] [blame] | 473 | new_syms = realloc(syms, nsyms * sizeof(*syms)); |
| 474 | if (new_syms == NULL) { |
| 475 | free(s); |
| 476 | free(syms); |
| 477 | free(strings); |
| 478 | return; |
| 479 | } |
| 480 | syms = new_syms; |
blueswir1 | 8477850 | 2008-10-26 20:33:16 +0000 | [diff] [blame] | 481 | |
| 482 | qsort(syms, nsyms, sizeof(*syms), symcmp); |
| 483 | |
| 484 | lseek(fd, strtab.sh_offset, SEEK_SET); |
Stefan Weil | 2971871 | 2011-01-16 16:28:20 +0100 | [diff] [blame] | 485 | if (read(fd, strings, strtab.sh_size) != strtab.sh_size) { |
| 486 | free(s); |
| 487 | free(syms); |
| 488 | free(strings); |
blueswir1 | 8477850 | 2008-10-26 20:33:16 +0000 | [diff] [blame] | 489 | return; |
Stefan Weil | 2971871 | 2011-01-16 16:28:20 +0100 | [diff] [blame] | 490 | } |
blueswir1 | 8477850 | 2008-10-26 20:33:16 +0000 | [diff] [blame] | 491 | s->disas_num_syms = nsyms; |
| 492 | #if ELF_CLASS == ELFCLASS32 |
| 493 | s->disas_symtab.elf32 = syms; |
Blue Swirl | 032e51d | 2009-09-27 19:30:56 +0000 | [diff] [blame] | 494 | s->lookup_symbol = (lookup_symbol_t)lookup_symbolxx; |
blueswir1 | 8477850 | 2008-10-26 20:33:16 +0000 | [diff] [blame] | 495 | #else |
| 496 | s->disas_symtab.elf64 = syms; |
Blue Swirl | 032e51d | 2009-09-27 19:30:56 +0000 | [diff] [blame] | 497 | s->lookup_symbol = (lookup_symbol_t)lookup_symbolxx; |
blueswir1 | 8477850 | 2008-10-26 20:33:16 +0000 | [diff] [blame] | 498 | #endif |
| 499 | s->next = syminfos; |
| 500 | syminfos = s; |
| 501 | } |
| 502 | |
Warner Losh | c09f12f | 2021-08-06 17:12:24 -0600 | [diff] [blame] | 503 | /* Check the elf header and see if this a target elf binary. */ |
| 504 | int is_target_elf_binary(int fd) |
| 505 | { |
| 506 | uint8_t buf[128]; |
| 507 | struct elfhdr elf_ex; |
| 508 | |
| 509 | if (lseek(fd, 0L, SEEK_SET) < 0) { |
| 510 | return 0; |
| 511 | } |
| 512 | if (read(fd, buf, sizeof(buf)) < 0) { |
| 513 | return 0; |
| 514 | } |
| 515 | |
| 516 | elf_ex = *((struct elfhdr *)buf); |
| 517 | bswap_ehdr(&elf_ex); |
| 518 | |
| 519 | if ((elf_ex.e_type != ET_EXEC && elf_ex.e_type != ET_DYN) || |
| 520 | (!elf_check_arch(elf_ex.e_machine))) { |
| 521 | return 0; |
| 522 | } else { |
| 523 | return 1; |
| 524 | } |
| 525 | } |
| 526 | |
| 527 | static int |
| 528 | load_elf_sections(const struct elfhdr *hdr, struct elf_phdr *phdr, int fd, |
| 529 | abi_ulong rbase, abi_ulong *baddrp) |
| 530 | { |
| 531 | struct elf_phdr *elf_ppnt; |
| 532 | abi_ulong baddr; |
| 533 | int i; |
| 534 | bool first; |
| 535 | |
| 536 | /* |
| 537 | * Now we do a little grungy work by mmaping the ELF image into |
| 538 | * the correct location in memory. At this point, we assume that |
| 539 | * the image should be loaded at fixed address, not at a variable |
| 540 | * address. |
| 541 | */ |
| 542 | first = true; |
| 543 | for (i = 0, elf_ppnt = phdr; i < hdr->e_phnum; i++, elf_ppnt++) { |
| 544 | int elf_prot = 0; |
| 545 | abi_ulong error; |
| 546 | |
| 547 | /* XXX Skip memsz == 0. */ |
| 548 | if (elf_ppnt->p_type != PT_LOAD) { |
| 549 | continue; |
| 550 | } |
| 551 | |
| 552 | if (elf_ppnt->p_flags & PF_R) { |
| 553 | elf_prot |= PROT_READ; |
| 554 | } |
| 555 | if (elf_ppnt->p_flags & PF_W) { |
| 556 | elf_prot |= PROT_WRITE; |
| 557 | } |
| 558 | if (elf_ppnt->p_flags & PF_X) { |
| 559 | elf_prot |= PROT_EXEC; |
| 560 | } |
| 561 | |
| 562 | error = target_mmap(TARGET_ELF_PAGESTART(rbase + elf_ppnt->p_vaddr), |
| 563 | (elf_ppnt->p_filesz + |
| 564 | TARGET_ELF_PAGEOFFSET(elf_ppnt->p_vaddr)), |
| 565 | elf_prot, |
| 566 | (MAP_FIXED | MAP_PRIVATE | MAP_DENYWRITE), |
| 567 | fd, |
| 568 | (elf_ppnt->p_offset - |
| 569 | TARGET_ELF_PAGEOFFSET(elf_ppnt->p_vaddr))); |
| 570 | if (error == -1) { |
| 571 | perror("mmap"); |
| 572 | exit(-1); |
| 573 | } else if (elf_ppnt->p_memsz != elf_ppnt->p_filesz) { |
| 574 | abi_ulong start_bss, end_bss; |
| 575 | |
| 576 | start_bss = rbase + elf_ppnt->p_vaddr + elf_ppnt->p_filesz; |
| 577 | end_bss = rbase + elf_ppnt->p_vaddr + elf_ppnt->p_memsz; |
| 578 | |
| 579 | /* |
| 580 | * Calling set_brk effectively mmaps the pages that we need for the |
| 581 | * bss and break sections. |
| 582 | */ |
| 583 | set_brk(start_bss, end_bss); |
| 584 | padzero(start_bss, end_bss); |
| 585 | } |
| 586 | |
| 587 | if (first) { |
| 588 | baddr = TARGET_ELF_PAGESTART(rbase + elf_ppnt->p_vaddr); |
| 589 | first = false; |
| 590 | } |
| 591 | } |
| 592 | |
| 593 | if (baddrp != NULL) { |
| 594 | *baddrp = baddr; |
| 595 | } |
| 596 | return 0; |
| 597 | } |
| 598 | |
Warner Losh | afcbcff | 2021-04-29 10:04:28 -0600 | [diff] [blame] | 599 | int load_elf_binary(struct bsd_binprm *bprm, struct target_pt_regs *regs, |
Warner Losh | b4bebee | 2021-04-23 09:05:57 -0600 | [diff] [blame] | 600 | struct image_info *info) |
blueswir1 | 8477850 | 2008-10-26 20:33:16 +0000 | [diff] [blame] | 601 | { |
| 602 | struct elfhdr elf_ex; |
| 603 | struct elfhdr interp_elf_ex; |
blueswir1 | 8477850 | 2008-10-26 20:33:16 +0000 | [diff] [blame] | 604 | int interpreter_fd = -1; /* avoid warning */ |
Warner Losh | c09f12f | 2021-08-06 17:12:24 -0600 | [diff] [blame] | 605 | abi_ulong load_addr; |
blueswir1 | 8477850 | 2008-10-26 20:33:16 +0000 | [diff] [blame] | 606 | int i; |
Warner Losh | c09f12f | 2021-08-06 17:12:24 -0600 | [diff] [blame] | 607 | struct elf_phdr *elf_ppnt; |
blueswir1 | 8477850 | 2008-10-26 20:33:16 +0000 | [diff] [blame] | 608 | struct elf_phdr *elf_phdata; |
Warner Losh | c09f12f | 2021-08-06 17:12:24 -0600 | [diff] [blame] | 609 | abi_ulong elf_brk; |
| 610 | int error, retval; |
| 611 | char *elf_interpreter; |
| 612 | abi_ulong baddr, elf_entry, et_dyn_addr, interp_load_addr = 0; |
blueswir1 | 8477850 | 2008-10-26 20:33:16 +0000 | [diff] [blame] | 613 | abi_ulong reloc_func_desc = 0; |
blueswir1 | 8477850 | 2008-10-26 20:33:16 +0000 | [diff] [blame] | 614 | |
blueswir1 | 8477850 | 2008-10-26 20:33:16 +0000 | [diff] [blame] | 615 | load_addr = 0; |
blueswir1 | 8477850 | 2008-10-26 20:33:16 +0000 | [diff] [blame] | 616 | elf_ex = *((struct elfhdr *) bprm->buf); /* exec-header */ |
blueswir1 | 8477850 | 2008-10-26 20:33:16 +0000 | [diff] [blame] | 617 | bswap_ehdr(&elf_ex); |
blueswir1 | 8477850 | 2008-10-26 20:33:16 +0000 | [diff] [blame] | 618 | |
| 619 | /* First of all, some simple consistency checks */ |
| 620 | if ((elf_ex.e_type != ET_EXEC && elf_ex.e_type != ET_DYN) || |
Warner Losh | 0456a17 | 2021-08-06 14:38:48 -0600 | [diff] [blame] | 621 | (!elf_check_arch(elf_ex.e_machine))) { |
blueswir1 | 8477850 | 2008-10-26 20:33:16 +0000 | [diff] [blame] | 622 | return -ENOEXEC; |
| 623 | } |
| 624 | |
| 625 | bprm->p = copy_elf_strings(1, &bprm->filename, bprm->page, bprm->p); |
Warner Losh | 0456a17 | 2021-08-06 14:38:48 -0600 | [diff] [blame] | 626 | bprm->p = copy_elf_strings(bprm->envc, bprm->envp, bprm->page, bprm->p); |
| 627 | bprm->p = copy_elf_strings(bprm->argc, bprm->argv, bprm->page, bprm->p); |
blueswir1 | 8477850 | 2008-10-26 20:33:16 +0000 | [diff] [blame] | 628 | if (!bprm->p) { |
| 629 | retval = -E2BIG; |
| 630 | } |
| 631 | |
| 632 | /* Now read in all of the header information */ |
Warner Losh | 0456a17 | 2021-08-06 14:38:48 -0600 | [diff] [blame] | 633 | elf_phdata = (struct elf_phdr *)malloc(elf_ex.e_phentsize * elf_ex.e_phnum); |
blueswir1 | 8477850 | 2008-10-26 20:33:16 +0000 | [diff] [blame] | 634 | if (elf_phdata == NULL) { |
| 635 | return -ENOMEM; |
| 636 | } |
| 637 | |
| 638 | retval = lseek(bprm->fd, elf_ex.e_phoff, SEEK_SET); |
Warner Losh | b4bebee | 2021-04-23 09:05:57 -0600 | [diff] [blame] | 639 | if (retval > 0) { |
| 640 | retval = read(bprm->fd, (char *)elf_phdata, |
blueswir1 | 8477850 | 2008-10-26 20:33:16 +0000 | [diff] [blame] | 641 | elf_ex.e_phentsize * elf_ex.e_phnum); |
| 642 | } |
| 643 | |
| 644 | if (retval < 0) { |
| 645 | perror("load_elf_binary"); |
| 646 | exit(-1); |
Warner Losh | b4bebee | 2021-04-23 09:05:57 -0600 | [diff] [blame] | 647 | free(elf_phdata); |
blueswir1 | 8477850 | 2008-10-26 20:33:16 +0000 | [diff] [blame] | 648 | return -errno; |
| 649 | } |
| 650 | |
Warner Losh | b62f790 | 2021-08-02 22:59:12 -0600 | [diff] [blame] | 651 | bswap_phdr(elf_phdata, elf_ex.e_phnum); |
blueswir1 | 8477850 | 2008-10-26 20:33:16 +0000 | [diff] [blame] | 652 | elf_ppnt = elf_phdata; |
| 653 | |
blueswir1 | 8477850 | 2008-10-26 20:33:16 +0000 | [diff] [blame] | 654 | elf_brk = 0; |
| 655 | |
| 656 | |
blueswir1 | 8477850 | 2008-10-26 20:33:16 +0000 | [diff] [blame] | 657 | elf_interpreter = NULL; |
Warner Losh | 0456a17 | 2021-08-06 14:38:48 -0600 | [diff] [blame] | 658 | for (i = 0; i < elf_ex.e_phnum; i++) { |
blueswir1 | 8477850 | 2008-10-26 20:33:16 +0000 | [diff] [blame] | 659 | if (elf_ppnt->p_type == PT_INTERP) { |
Warner Losh | 0456a17 | 2021-08-06 14:38:48 -0600 | [diff] [blame] | 660 | if (elf_interpreter != NULL) { |
Warner Losh | b4bebee | 2021-04-23 09:05:57 -0600 | [diff] [blame] | 661 | free(elf_phdata); |
blueswir1 | 8477850 | 2008-10-26 20:33:16 +0000 | [diff] [blame] | 662 | free(elf_interpreter); |
| 663 | close(bprm->fd); |
| 664 | return -EINVAL; |
| 665 | } |
| 666 | |
blueswir1 | 8477850 | 2008-10-26 20:33:16 +0000 | [diff] [blame] | 667 | elf_interpreter = (char *)malloc(elf_ppnt->p_filesz); |
blueswir1 | 8477850 | 2008-10-26 20:33:16 +0000 | [diff] [blame] | 668 | if (elf_interpreter == NULL) { |
Warner Losh | b4bebee | 2021-04-23 09:05:57 -0600 | [diff] [blame] | 669 | free(elf_phdata); |
blueswir1 | 8477850 | 2008-10-26 20:33:16 +0000 | [diff] [blame] | 670 | close(bprm->fd); |
| 671 | return -ENOMEM; |
| 672 | } |
| 673 | |
| 674 | retval = lseek(bprm->fd, elf_ppnt->p_offset, SEEK_SET); |
Warner Losh | b4bebee | 2021-04-23 09:05:57 -0600 | [diff] [blame] | 675 | if (retval >= 0) { |
blueswir1 | 8477850 | 2008-10-26 20:33:16 +0000 | [diff] [blame] | 676 | retval = read(bprm->fd, elf_interpreter, elf_ppnt->p_filesz); |
| 677 | } |
Warner Losh | b4bebee | 2021-04-23 09:05:57 -0600 | [diff] [blame] | 678 | if (retval < 0) { |
blueswir1 | 8477850 | 2008-10-26 20:33:16 +0000 | [diff] [blame] | 679 | perror("load_elf_binary2"); |
| 680 | exit(-1); |
| 681 | } |
| 682 | |
blueswir1 | 8477850 | 2008-10-26 20:33:16 +0000 | [diff] [blame] | 683 | if (retval >= 0) { |
| 684 | retval = open(path(elf_interpreter), O_RDONLY); |
Warner Losh | b4bebee | 2021-04-23 09:05:57 -0600 | [diff] [blame] | 685 | if (retval >= 0) { |
blueswir1 | 8477850 | 2008-10-26 20:33:16 +0000 | [diff] [blame] | 686 | interpreter_fd = retval; |
Warner Losh | 0456a17 | 2021-08-06 14:38:48 -0600 | [diff] [blame] | 687 | } else { |
blueswir1 | 8477850 | 2008-10-26 20:33:16 +0000 | [diff] [blame] | 688 | perror(elf_interpreter); |
| 689 | exit(-1); |
| 690 | /* retval = -errno; */ |
| 691 | } |
| 692 | } |
| 693 | |
| 694 | if (retval >= 0) { |
| 695 | retval = lseek(interpreter_fd, 0, SEEK_SET); |
Warner Losh | b4bebee | 2021-04-23 09:05:57 -0600 | [diff] [blame] | 696 | if (retval >= 0) { |
| 697 | retval = read(interpreter_fd, bprm->buf, 128); |
blueswir1 | 8477850 | 2008-10-26 20:33:16 +0000 | [diff] [blame] | 698 | } |
| 699 | } |
| 700 | if (retval >= 0) { |
Warner Losh | 0456a17 | 2021-08-06 14:38:48 -0600 | [diff] [blame] | 701 | interp_elf_ex = *((struct elfhdr *) bprm->buf); |
blueswir1 | 8477850 | 2008-10-26 20:33:16 +0000 | [diff] [blame] | 702 | } |
| 703 | if (retval < 0) { |
| 704 | perror("load_elf_binary3"); |
| 705 | exit(-1); |
Warner Losh | b4bebee | 2021-04-23 09:05:57 -0600 | [diff] [blame] | 706 | free(elf_phdata); |
blueswir1 | 8477850 | 2008-10-26 20:33:16 +0000 | [diff] [blame] | 707 | free(elf_interpreter); |
| 708 | close(bprm->fd); |
| 709 | return retval; |
| 710 | } |
| 711 | } |
| 712 | elf_ppnt++; |
| 713 | } |
| 714 | |
| 715 | /* Some simple consistency checks for the interpreter */ |
Warner Losh | b4bebee | 2021-04-23 09:05:57 -0600 | [diff] [blame] | 716 | if (elf_interpreter) { |
blueswir1 | 8477850 | 2008-10-26 20:33:16 +0000 | [diff] [blame] | 717 | if (interp_elf_ex.e_ident[0] != 0x7f || |
Warner Losh | ffa0366 | 2021-04-30 08:17:23 -0600 | [diff] [blame] | 718 | strncmp((char *)&interp_elf_ex.e_ident[1], "ELF", 3) != 0) { |
blueswir1 | 8477850 | 2008-10-26 20:33:16 +0000 | [diff] [blame] | 719 | free(elf_interpreter); |
| 720 | free(elf_phdata); |
| 721 | close(bprm->fd); |
| 722 | return -ELIBBAD; |
| 723 | } |
| 724 | } |
| 725 | |
Warner Losh | 0456a17 | 2021-08-06 14:38:48 -0600 | [diff] [blame] | 726 | /* |
| 727 | * OK, we are done with that, now set up the arg stuff, and then start this |
| 728 | * sucker up |
| 729 | */ |
Warner Losh | ffa0366 | 2021-04-30 08:17:23 -0600 | [diff] [blame] | 730 | if (!bprm->p) { |
| 731 | free(elf_interpreter); |
| 732 | free(elf_phdata); |
| 733 | close(bprm->fd); |
| 734 | return -E2BIG; |
blueswir1 | 8477850 | 2008-10-26 20:33:16 +0000 | [diff] [blame] | 735 | } |
| 736 | |
| 737 | /* OK, This is the point of no return */ |
| 738 | info->end_data = 0; |
| 739 | info->end_code = 0; |
| 740 | info->start_mmap = (abi_ulong)ELF_START_MMAP; |
| 741 | info->mmap = 0; |
| 742 | elf_entry = (abi_ulong) elf_ex.e_entry; |
| 743 | |
Warner Losh | c09f12f | 2021-08-06 17:12:24 -0600 | [diff] [blame] | 744 | /* XXX Join this with PT_INTERP search? */ |
| 745 | baddr = 0; |
| 746 | for (i = 0, elf_ppnt = elf_phdata; i < elf_ex.e_phnum; i++, elf_ppnt++) { |
| 747 | if (elf_ppnt->p_type != PT_LOAD) { |
| 748 | continue; |
| 749 | } |
| 750 | baddr = elf_ppnt->p_vaddr; |
| 751 | break; |
| 752 | } |
| 753 | |
| 754 | et_dyn_addr = 0; |
| 755 | if (elf_ex.e_type == ET_DYN && baddr == 0) { |
| 756 | et_dyn_addr = ELF_ET_DYN_LOAD_ADDR; |
| 757 | } |
| 758 | |
| 759 | /* |
| 760 | * Do this so that we can load the interpreter, if need be. We will |
| 761 | * change some of these later |
| 762 | */ |
blueswir1 | 8477850 | 2008-10-26 20:33:16 +0000 | [diff] [blame] | 763 | info->rss = 0; |
Warner Losh | 98b34d3 | 2021-08-04 17:13:24 -0600 | [diff] [blame] | 764 | setup_arg_pages(bprm, info, &bprm->p, &bprm->stringp); |
blueswir1 | 8477850 | 2008-10-26 20:33:16 +0000 | [diff] [blame] | 765 | info->start_stack = bprm->p; |
| 766 | |
Warner Losh | c09f12f | 2021-08-06 17:12:24 -0600 | [diff] [blame] | 767 | info->elf_flags = elf_ex.e_flags; |
blueswir1 | 8477850 | 2008-10-26 20:33:16 +0000 | [diff] [blame] | 768 | |
Warner Losh | c09f12f | 2021-08-06 17:12:24 -0600 | [diff] [blame] | 769 | error = load_elf_sections(&elf_ex, elf_phdata, bprm->fd, et_dyn_addr, |
| 770 | &load_addr); |
Warner Losh | b4bebee | 2021-04-23 09:05:57 -0600 | [diff] [blame] | 771 | for (i = 0, elf_ppnt = elf_phdata; i < elf_ex.e_phnum; i++, elf_ppnt++) { |
Warner Losh | c09f12f | 2021-08-06 17:12:24 -0600 | [diff] [blame] | 772 | if (elf_ppnt->p_type != PT_LOAD) { |
blueswir1 | 8477850 | 2008-10-26 20:33:16 +0000 | [diff] [blame] | 773 | continue; |
blueswir1 | 8477850 | 2008-10-26 20:33:16 +0000 | [diff] [blame] | 774 | } |
Warner Losh | c09f12f | 2021-08-06 17:12:24 -0600 | [diff] [blame] | 775 | if (elf_ppnt->p_memsz > elf_ppnt->p_filesz) |
| 776 | elf_brk = MAX(elf_brk, et_dyn_addr + elf_ppnt->p_vaddr + |
| 777 | elf_ppnt->p_memsz); |
blueswir1 | 8477850 | 2008-10-26 20:33:16 +0000 | [diff] [blame] | 778 | } |
Warner Losh | c09f12f | 2021-08-06 17:12:24 -0600 | [diff] [blame] | 779 | if (error != 0) { |
| 780 | perror("load_elf_sections"); |
| 781 | exit(-1); |
| 782 | } |
blueswir1 | 8477850 | 2008-10-26 20:33:16 +0000 | [diff] [blame] | 783 | |
| 784 | if (elf_interpreter) { |
Warner Losh | ffa0366 | 2021-04-30 08:17:23 -0600 | [diff] [blame] | 785 | elf_entry = load_elf_interp(&interp_elf_ex, interpreter_fd, |
| 786 | &interp_load_addr); |
blueswir1 | 8477850 | 2008-10-26 20:33:16 +0000 | [diff] [blame] | 787 | reloc_func_desc = interp_load_addr; |
| 788 | |
| 789 | close(interpreter_fd); |
| 790 | free(elf_interpreter); |
| 791 | |
| 792 | if (elf_entry == ~((abi_ulong)0UL)) { |
| 793 | printf("Unable to load interpreter\n"); |
| 794 | free(elf_phdata); |
| 795 | exit(-1); |
| 796 | return 0; |
| 797 | } |
Warner Losh | c09f12f | 2021-08-06 17:12:24 -0600 | [diff] [blame] | 798 | } else { |
| 799 | interp_load_addr = et_dyn_addr; |
| 800 | elf_entry += interp_load_addr; |
blueswir1 | 8477850 | 2008-10-26 20:33:16 +0000 | [diff] [blame] | 801 | } |
| 802 | |
| 803 | free(elf_phdata); |
| 804 | |
Warner Losh | 0456a17 | 2021-08-06 14:38:48 -0600 | [diff] [blame] | 805 | if (qemu_log_enabled()) { |
blueswir1 | 8477850 | 2008-10-26 20:33:16 +0000 | [diff] [blame] | 806 | load_symbols(&elf_ex, bprm->fd); |
Warner Losh | 0456a17 | 2021-08-06 14:38:48 -0600 | [diff] [blame] | 807 | } |
blueswir1 | 8477850 | 2008-10-26 20:33:16 +0000 | [diff] [blame] | 808 | |
Warner Losh | ffa0366 | 2021-04-30 08:17:23 -0600 | [diff] [blame] | 809 | close(bprm->fd); |
blueswir1 | 8477850 | 2008-10-26 20:33:16 +0000 | [diff] [blame] | 810 | |
Warner Losh | 98b34d3 | 2021-08-04 17:13:24 -0600 | [diff] [blame] | 811 | bprm->p = target_create_elf_tables(bprm->p, bprm->argc, bprm->envc, |
| 812 | bprm->stringp, &elf_ex, load_addr, |
Warner Losh | c09f12f | 2021-08-06 17:12:24 -0600 | [diff] [blame] | 813 | et_dyn_addr, interp_load_addr, info); |
blueswir1 | 8477850 | 2008-10-26 20:33:16 +0000 | [diff] [blame] | 814 | info->load_addr = reloc_func_desc; |
| 815 | info->start_brk = info->brk = elf_brk; |
blueswir1 | 8477850 | 2008-10-26 20:33:16 +0000 | [diff] [blame] | 816 | info->start_stack = bprm->p; |
Warner Losh | c09f12f | 2021-08-06 17:12:24 -0600 | [diff] [blame] | 817 | info->load_bias = 0; |
blueswir1 | 8477850 | 2008-10-26 20:33:16 +0000 | [diff] [blame] | 818 | |
blueswir1 | 8477850 | 2008-10-26 20:33:16 +0000 | [diff] [blame] | 819 | info->entry = elf_entry; |
| 820 | |
Warner Losh | 0475f8f | 2021-08-06 14:20:16 -0600 | [diff] [blame] | 821 | #ifdef USE_ELF_CORE_DUMP |
| 822 | bprm->core_dump = &elf_core_dump; |
| 823 | #else |
| 824 | bprm->core_dump = NULL; |
| 825 | #endif |
| 826 | |
blueswir1 | 8477850 | 2008-10-26 20:33:16 +0000 | [diff] [blame] | 827 | return 0; |
| 828 | } |
| 829 | |
blueswir1 | 8477850 | 2008-10-26 20:33:16 +0000 | [diff] [blame] | 830 | void do_init_thread(struct target_pt_regs *regs, struct image_info *infop) |
| 831 | { |
Warner Losh | a8fe6d5 | 2021-08-03 22:04:20 -0600 | [diff] [blame] | 832 | |
| 833 | target_thread_init(regs, infop); |
blueswir1 | 8477850 | 2008-10-26 20:33:16 +0000 | [diff] [blame] | 834 | } |