imgact_coff.c revision 10221
1/*- 2 * Copyright (c) 1994 Sean Eric Fagan 3 * Copyright (c) 1994 S�ren Schmidt 4 * All rights reserved. 5 * 6 * Redistribution and use in source and binary forms, with or without 7 * modification, are permitted provided that the following conditions 8 * are met: 9 * 1. Redistributions of source code must retain the above copyright 10 * notice, this list of conditions and the following disclaimer 11 * in this position and unchanged. 12 * 2. Redistributions in binary form must reproduce the above copyright 13 * notice, this list of conditions and the following disclaimer in the 14 * documentation and/or other materials provided with the distribution. 15 * 3. The name of the author may not be used to endorse or promote products 16 * derived from this software withough specific prior written permission 17 * 18 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR 19 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 20 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 21 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, 22 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT 23 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 24 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 25 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 26 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF 27 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 28 * 29 * $Id: imgact_coff.c,v 1.4 1995/05/30 08:00:17 rgrimes Exp $ 30 */ 31 32#include <sys/param.h> 33#include <sys/systm.h> 34#include <sys/resourcevar.h> 35#include <sys/exec.h> 36#include <sys/mman.h> 37#include <sys/imgact.h> 38#include <sys/kernel.h> 39#include <sys/file.h> 40#include <sys/malloc.h> 41#include <sys/mount.h> 42#include <sys/sysent.h> 43#include <vm/vm.h> 44#include <vm/vm_kern.h> 45#include "coff.h" 46#include "ibcs2.h" 47 48static int 49load_coff_section(vmspace, vp, offset, vmaddr, memsz, filsz, prot) 50 struct vmspace *vmspace; 51 struct vnode *vp; 52 vm_offset_t offset; 53 caddr_t vmaddr; 54 size_t memsz, filsz; 55 vm_prot_t prot; 56{ 57 size_t map_len; 58 vm_offset_t map_offset; 59 vm_offset_t map_addr; 60 int error; 61 unsigned char *data_buf = 0; 62 size_t copy_len; 63 64 map_offset = trunc_page(offset); 65 map_addr = trunc_page(vmaddr); 66 67 if (memsz > filsz) { 68 /* 69 * We have the stupid situation that 70 * the section is longer than it is on file, 71 * which means it has zero-filled areas, and 72 * we have to work for it. Stupid iBCS! 73 */ 74 map_len = trunc_page(offset + filsz) - trunc_page(map_offset); 75 } else { 76 /* 77 * The only stuff we care about is on disk, and we 78 * don't care if we map in more than is really there. 79 */ 80 map_len = round_page(offset + filsz) - trunc_page(map_offset); 81 } 82 83if (ibcs2_trace & IBCS2_TRACE_COFF) { 84printf("%s(%d): vm_mmap(&vmspace->vm_map, &0x%08lx, 0x%x, 0x%x, " 85 "VM_PROT_ALL, MAP_FILE | MAP_PRIVATE | MAP_FIXED, vp, 0x%x)\n", 86 __FILE__, __LINE__, map_addr, map_len, prot, map_offset); 87} 88 89 if (error = vm_mmap(&vmspace->vm_map, 90 &map_addr, 91 map_len, 92 prot, 93 VM_PROT_ALL, 94 MAP_FILE | MAP_PRIVATE | MAP_FIXED, 95 (caddr_t) vp, 96 map_offset)) 97 return error; 98 99 if (memsz == filsz) { 100 /* We're done! */ 101 return 0; 102 } 103 104 /* 105 * Now we have screwball stuff, to accomodate stupid COFF. 106 * We have to map the remaining bit of the file into the kernel's 107 * memory map, allocate some anonymous memory, copy that last 108 * bit into it, and then we're done. *sigh* 109 * For clean-up reasons, we actally map in the file last. 110 */ 111 112 copy_len = (offset + filsz) - trunc_page(offset + filsz); 113 map_addr = trunc_page(vmaddr + filsz); 114 map_len = round_page(memsz) - trunc_page(filsz); 115 116if (ibcs2_trace & IBCS2_TRACE_COFF) { 117printf("%s(%d): vm_map_find(&vmspace->vm_map, NULL, 0, &0x%08lx, 0x%x, FALSE)\n", 118 __FILE__, __LINE__, map_addr, map_len); 119} 120 121 if (map_len != 0) { 122 error = vm_map_find(&vmspace->vm_map, NULL, 0, &map_addr, 123 map_len, FALSE); 124 if (error) 125 return error; 126 } 127 128 if (error = vm_mmap(kernel_map, 129 (vm_offset_t *) &data_buf, 130 PAGE_SIZE, 131 VM_PROT_READ, 132 VM_PROT_READ, 133 MAP_FILE, 134 (caddr_t) vp, 135 trunc_page(offset + filsz))) 136 return error; 137 138 bcopy(data_buf, (caddr_t) map_addr, copy_len); 139 140 if (vm_map_remove(kernel_map, 141 (vm_offset_t) data_buf, 142 (vm_offset_t) data_buf + PAGE_SIZE)) 143 panic("load_coff_section vm_map_remove failed"); 144 145 return 0; 146} 147 148int 149coff_load_file(struct proc *p, char *name) 150{ 151 struct vmspace *vmspace = p->p_vmspace; 152 int error; 153 struct nameidata nd; 154 struct vnode *vnodep; 155 struct vattr attr; 156 struct filehdr *fhdr; 157 struct aouthdr *ahdr; 158 struct scnhdr *scns; 159 char *ptr = 0; 160 int nscns; 161 unsigned long text_offset = 0, text_address = 0, text_size = 0; 162 unsigned long data_offset = 0, data_address = 0, data_size = 0; 163 unsigned long bss_size = 0; 164 int i; 165 166 nd.ni_cnd.cn_nameiop = LOOKUP; 167 nd.ni_cnd.cn_flags = LOCKLEAF | FOLLOW | SAVENAME; 168 nd.ni_cnd.cn_proc = curproc; 169 nd.ni_cnd.cn_cred = curproc->p_cred->pc_ucred; 170 nd.ni_segflg = UIO_SYSSPACE; 171 nd.ni_dirp = name; 172 173 error = namei(&nd); 174 if (error) 175 return error; 176 177 vnodep = nd.ni_vp; 178 if (vnodep == NULL) 179 return ENOEXEC; 180 181 if (vnodep->v_writecount) { 182 error = ETXTBSY; 183 goto fail; 184 } 185 186 if (error = VOP_GETATTR(vnodep, &attr, p->p_ucred, p)) 187 goto fail; 188 189 if ((vnodep->v_mount->mnt_flag & MNT_NOEXEC) 190 || ((attr.va_mode & 0111) == 0) 191 || (attr.va_type != VREG)) 192 goto fail; 193 194 if (attr.va_size == 0) { 195 error = ENOEXEC; 196 goto fail; 197 } 198 199 if (error = VOP_ACCESS(vnodep, VEXEC, p->p_ucred, p)) 200 goto fail; 201 202 if (error = VOP_OPEN(vnodep, FREAD, p->p_ucred, p)) 203 goto fail; 204 205 if (error = vm_mmap(kernel_map, 206 (vm_offset_t *) &ptr, 207 PAGE_SIZE, 208 VM_PROT_READ, 209 VM_PROT_READ, 210 MAP_FILE, 211 (caddr_t) vnodep, 212 0)) 213 goto fail; 214 215 fhdr = (struct filehdr *)ptr; 216 217 if (fhdr->f_magic != I386_COFF) { 218 error = ENOEXEC; 219 goto dealloc_and_fail; 220 } 221 222 nscns = fhdr->f_nscns; 223 224 if ((nscns * sizeof(struct scnhdr)) > PAGE_SIZE) { 225 /* 226 * XXX -- just fail. I'm so lazy. 227 */ 228 error = ENOEXEC; 229 goto dealloc_and_fail; 230 } 231 232 ahdr = (struct aouthdr*)(ptr + sizeof(struct filehdr)); 233 234 scns = (struct scnhdr*)(ptr + sizeof(struct filehdr) 235 + sizeof(struct aouthdr)); 236 237 for (i = 0; i < nscns; i++) { 238 if (scns[i].s_flags & STYP_NOLOAD) 239 continue; 240 else if (scns[i].s_flags & STYP_TEXT) { 241 text_address = scns[i].s_vaddr; 242 text_size = scns[i].s_size; 243 text_offset = scns[i].s_scnptr; 244 } 245 else if (scns[i].s_flags & STYP_DATA) { 246 data_address = scns[i].s_vaddr; 247 data_size = scns[i].s_size; 248 data_offset = scns[i].s_scnptr; 249 } else if (scns[i].s_flags & STYP_BSS) { 250 bss_size = scns[i].s_size; 251 } 252 } 253 254 if (error = load_coff_section(vmspace, vnodep, text_offset, 255 (caddr_t)text_address, 256 text_size, text_size, 257 VM_PROT_READ | VM_PROT_EXECUTE)) { 258 goto dealloc_and_fail; 259 } 260 if (error = load_coff_section(vmspace, vnodep, data_offset, 261 (caddr_t)data_address, 262 data_size + bss_size, data_size, 263 VM_PROT_ALL)) { 264 goto dealloc_and_fail; 265 } 266 267 error = 0; 268 269 dealloc_and_fail: 270 if (vm_map_remove(kernel_map, 271 (vm_offset_t) ptr, 272 (vm_offset_t) ptr + PAGE_SIZE)) 273 panic(__FUNCTION__ " vm_map_remove failed"); 274 275 fail: 276 vput(nd.ni_vp); 277 FREE(nd.ni_cnd.cn_pnbuf, M_NAMEI); 278 return error; 279} 280 281int 282exec_coff_imgact(iparams) 283 struct image_params *iparams; 284{ 285 struct filehdr *fhdr = (struct filehdr*)iparams->image_header; 286 struct aouthdr *ahdr; 287 struct scnhdr *scns; 288 int i; 289 struct vmspace *vmspace = iparams->proc->p_vmspace; 290 unsigned long vmaddr; 291 int nscns; 292 int error, len; 293 extern struct sysentvec ibcs2_svr3_sysvec; 294 unsigned long text_offset = 0, text_address = 0, text_size = 0; 295 unsigned long data_offset = 0, data_address = 0, data_size = 0; 296 unsigned long bss_size = 0; 297 int need_hack_p; 298 unsigned long data_end; 299 unsigned long data_map_start, data_map_len, data_map_addr = 0; 300 unsigned long bss_address, bss_map_start, data_copy_len, bss_map_len; 301 unsigned char *data_buf = 0; 302 caddr_t hole; 303 304 if (fhdr->f_magic != I386_COFF || 305 !(fhdr->f_flags & F_EXEC)) { 306 307if (ibcs2_trace & IBCS2_TRACE_COFF) { 308printf("%s(%d): return -1\n", __FILE__, __LINE__); 309} 310 311 return -1; 312 } 313 314 nscns = fhdr->f_nscns; 315 if ((nscns * sizeof(struct scnhdr)) > PAGE_SIZE) { 316 /* 317 * For now, return an error -- need to be able to 318 * read in all of the section structures. 319 */ 320 321if (ibcs2_trace & IBCS2_TRACE_COFF) { 322printf("%s(%d): return -1\n", __FILE__, __LINE__); 323} 324 return -1; 325 } 326 327 ahdr = (struct aouthdr*)((char*)(iparams->image_header) + 328 sizeof(struct filehdr)); 329 iparams->entry_addr = ahdr->entry; 330 331 scns = (struct scnhdr*)((char*)(iparams->image_header) + 332 sizeof(struct filehdr) + 333 sizeof(struct aouthdr)); 334 335 if (error = exec_extract_strings(iparams)) { 336 337if (ibcs2_trace & IBCS2_TRACE_COFF) { 338printf("%s(%d): return %d\n", __FILE__, __LINE__, error); 339} 340 return error; 341 } 342 343 exec_new_vmspace(iparams); 344 345 for (i = 0; i < nscns; i++) { 346 347if (ibcs2_trace & IBCS2_TRACE_COFF) { 348printf("i = %d, scns[i].s_name = %s, scns[i].s_vaddr = %08lx, " 349 "scns[i].s_scnptr = %d\n", i, scns[i].s_name, 350 scns[i].s_vaddr, scns[i].s_scnptr); 351} 352 if (scns[i].s_flags & STYP_NOLOAD) { 353 /* 354 * A section that is not loaded, for whatever 355 * reason. It takes precedance over other flag 356 * bits... 357 */ 358 continue; 359 } else if (scns[i].s_flags & STYP_TEXT) { 360 text_address = scns[i].s_vaddr; 361 text_size = scns[i].s_size; 362 text_offset = scns[i].s_scnptr; 363 } else if (scns[i].s_flags & STYP_DATA) { 364 /* .data section */ 365 data_address = scns[i].s_vaddr; 366 data_size = scns[i].s_size; 367 data_offset = scns[i].s_scnptr; 368 } else if (scns[i].s_flags & STYP_BSS) { 369 /* .bss section */ 370 bss_size = scns[i].s_size; 371 } else if (scns[i].s_flags & STYP_LIB) { 372 char *buf = 0, *ptr; 373 int foff = trunc_page(scns[i].s_scnptr); 374 int off = scns[i].s_scnptr - foff; 375 int len = round_page(scns[i].s_size + PAGE_SIZE); 376 int j; 377 378 if (error = vm_mmap(kernel_map, 379 (vm_offset_t *) &buf, 380 len, 381 VM_PROT_READ, 382 VM_PROT_READ, 383 MAP_FILE, 384 (caddr_t) iparams->vnodep, 385 foff)) { 386 return ENOEXEC; 387 } 388 for (j = off; j < scns[i].s_size + off; j++) { 389 char *libname; 390 libname = buf + j + 4 * *(long*)(buf + j + 4); 391 j += 4* *(long*)(buf + j); 392 393if (ibcs2_trace & IBCS2_TRACE_COFF) { 394printf("%s(%d): shared library %s\n", __FILE__, __LINE__, libname); 395} 396 error = coff_load_file(iparams->proc, libname); 397 if (error) 398 break; 399 } 400 if (vm_map_remove(kernel_map, 401 (vm_offset_t) buf, 402 (vm_offset_t) buf + len)) 403 panic("exec_coff_imgact vm_map_remove failed"); 404 if (error) 405 return error; 406 } 407 } 408 /* 409 * Map in .text now 410 */ 411 412if (ibcs2_trace & IBCS2_TRACE_COFF) { 413printf("%s(%d): load_coff_section(vmspace, " 414 "iparams->vnodep, %08lx, %08lx, 0x%x, 0x%x, 0x%x)\n", 415 __FILE__, __LINE__, text_offset, text_address, 416 text_size, text_size, VM_PROT_READ | VM_PROT_EXECUTE); 417} 418 if (error = load_coff_section(vmspace, iparams->vnodep, 419 text_offset, (caddr_t)text_address, 420 text_size, text_size, 421 VM_PROT_READ | VM_PROT_EXECUTE)) { 422 423if (ibcs2_trace & IBCS2_TRACE_COFF) { 424printf("%s(%d): error = %d\n", __FILE__, __LINE__, error); 425} 426 return error; 427 } 428 /* 429 * Map in .data and .bss now 430 */ 431 432 433if (ibcs2_trace & IBCS2_TRACE_COFF) { 434printf("%s(%d): load_coff_section(vmspace, " 435 "iparams->vnodep, 0x%08lx, 0x%08lx, 0x%x, 0x%x, 0x%x)\n", 436 __FILE__, __LINE__, data_offset, data_address, 437 data_size + bss_size, data_size, VM_PROT_ALL); 438} 439 if (error = load_coff_section(vmspace, iparams->vnodep, 440 data_offset, (caddr_t)data_address, 441 data_size + bss_size, data_size, 442 VM_PROT_ALL)) { 443 444if (ibcs2_trace & IBCS2_TRACE_COFF) { 445printf("%s(%d): error = %d\n", __FILE__, __LINE__, error); 446} 447 return error; 448 } 449 450 iparams->interpreted = 0; 451 iparams->proc->p_sysent = &ibcs2_svr3_sysvec; 452 453 vmspace->vm_tsize = round_page(text_size) >> PAGE_SHIFT; 454 vmspace->vm_dsize = round_page(data_size + bss_size) >> PAGE_SHIFT; 455 vmspace->vm_taddr = (caddr_t)text_address; 456 vmspace->vm_daddr = (caddr_t)data_address; 457 458 hole = (caddr_t)trunc_page(vmspace->vm_daddr) + ctob(vmspace->vm_dsize); 459 460 461if (ibcs2_trace & IBCS2_TRACE_COFF) { 462printf("%s(%d): vm_map_find(&vmspace->vm_map, NULL, 0, &0x%08lx, PAGE_SIZE, FALSE)\n", 463 __FILE__, __LINE__, hole); 464printf("imgact: error = %d\n", error); 465} 466 error = vm_map_find(&vmspace->vm_map, NULL, 0, 467 (vm_offset_t *) &hole, PAGE_SIZE, FALSE); 468 469if (ibcs2_trace & IBCS2_TRACE_COFF) { 470printf("IBCS2: start vm_dsize = 0x%x, vm_daddr = 0x%x end = 0x%x\n", 471 ctob(vmspace->vm_dsize), vmspace->vm_daddr, 472 ctob(vmspace->vm_dsize) + vmspace->vm_daddr ); 473printf("%s(%d): returning successfully!\n", __FILE__, __LINE__); 474} 475 /* Indicate that this file should not be modified */ 476 iparams->vnodep->v_flag |= VTEXT; 477 return 0; 478} 479 480/* 481 * Tell kern_execve.c about it, with a little help from the linker. 482 * Since `const' objects end up in the text segment, TEXT_SET is the 483 * correct directive to use. 484 */ 485const struct execsw coff_execsw = { exec_coff_imgact, "coff" }; 486TEXT_SET(execsw_set, coff_execsw); 487