1 /* $NetBSD: linux_machdep.c,v 1.39 1998/01/24 13:19:48 mycroft Exp $ */ 2 3 /* 4 * Copyright (c) 1995 Frank van der Linden 5 * All rights reserved. 6 * 7 * Redistribution and use in source and binary forms, with or without 8 * modification, are permitted provided that the following conditions 9 * are met: 10 * 1. Redistributions of source code must retain the above copyright 11 * notice, this list of conditions and the following disclaimer. 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. All advertising materials mentioning features or use of this software 16 * must display the following acknowledgement: 17 * This product includes software developed for the NetBSD Project 18 * by Frank van der Linden 19 * 4. The name of the author may not be used to endorse or promote products 20 * derived from this software without specific prior written permission 21 * 22 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR 23 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 24 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 25 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, 26 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT 27 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 28 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 29 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 30 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF 31 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 32 */ 33 34 #include "opt_vm86.h" 35 #include "opt_user_ldt.h" 36 37 #include <sys/param.h> 38 #include <sys/systm.h> 39 #include <sys/signalvar.h> 40 #include <sys/kernel.h> 41 #include <sys/map.h> 42 #include <sys/proc.h> 43 #include <sys/user.h> 44 #include <sys/buf.h> 45 #include <sys/reboot.h> 46 #include <sys/conf.h> 47 #include <sys/exec.h> 48 #include <sys/file.h> 49 #include <sys/callout.h> 50 #include <sys/malloc.h> 51 #include <sys/mbuf.h> 52 #include <sys/msgbuf.h> 53 #include <sys/mount.h> 54 #include <sys/vnode.h> 55 #include <sys/device.h> 56 #include <sys/syscallargs.h> 57 #include <sys/filedesc.h> 58 #include <sys/exec_elf.h> 59 60 #include <compat/linux/linux_types.h> 61 #include <compat/linux/linux_signal.h> 62 #include <compat/linux/linux_syscallargs.h> 63 #include <compat/linux/linux_util.h> 64 #include <compat/linux/linux_ioctl.h> 65 #include <compat/linux/linux_exec.h> 66 67 #include <machine/cpu.h> 68 #include <machine/cpufunc.h> 69 #include <machine/psl.h> 70 #include <machine/reg.h> 71 #include <machine/segments.h> 72 #include <machine/specialreg.h> 73 #include <machine/sysarch.h> 74 #include <machine/vm86.h> 75 #include <machine/vmparam.h> 76 #include <machine/linux_machdep.h> 77 78 /* 79 * To see whether pcvt is configured (for virtual console ioctl calls). 80 */ 81 #ifndef NVT 82 #include "vt.h" 83 #endif 84 #if NVT > 0 85 #include <arch/i386/isa/pcvt/pcvt_ioctl.h> 86 #endif 87 88 #ifdef USER_LDT 89 #include <machine/cpu.h> 90 int linux_read_ldt __P((struct proc *, struct linux_sys_modify_ldt_args *, 91 register_t *)); 92 int linux_write_ldt __P((struct proc *, struct linux_sys_modify_ldt_args *, 93 register_t *)); 94 #endif 95 96 /* 97 * Deal with some i386-specific things in the Linux emulation code. 98 */ 99 100 void 101 linux_setregs(p, epp, stack) 102 struct proc *p; 103 struct exec_package *epp; 104 u_long stack; 105 { 106 register struct pcb *pcb = &p->p_addr->u_pcb; 107 108 pcb->pcb_savefpu.sv_env.en_cw = __Linux_NPXCW__; 109 setregs(p, epp, stack); 110 } 111 112 /* 113 * Send an interrupt to process. 114 * 115 * Stack is set up to allow sigcode stored 116 * in u. to call routine, followed by kcall 117 * to sigreturn routine below. After sigreturn 118 * resets the signal mask, the stack, and the 119 * frame pointer, it returns to the user 120 * specified pc, psl. 121 */ 122 123 void 124 linux_sendsig(catcher, sig, mask, code) 125 sig_t catcher; 126 int sig, mask; 127 u_long code; 128 { 129 register struct proc *p = curproc; 130 register struct trapframe *tf; 131 struct linux_sigframe *fp, frame; 132 struct sigacts *psp = p->p_sigacts; 133 int oonstack; 134 extern char linux_sigcode[], linux_esigcode[]; 135 136 tf = p->p_md.md_regs; 137 oonstack = psp->ps_sigstk.ss_flags & SS_ONSTACK; 138 139 /* 140 * Allocate space for the signal handler context. 141 */ 142 if ((psp->ps_flags & SAS_ALTSTACK) && !oonstack && 143 (psp->ps_sigonstack & sigmask(sig))) { 144 fp = (struct linux_sigframe *)(psp->ps_sigstk.ss_sp + 145 psp->ps_sigstk.ss_size - sizeof(struct linux_sigframe)); 146 psp->ps_sigstk.ss_flags |= SS_ONSTACK; 147 } else { 148 fp = (struct linux_sigframe *)tf->tf_esp - 1; 149 } 150 151 frame.sf_handler = catcher; 152 frame.sf_sig = bsd_to_linux_sig[sig]; 153 154 /* 155 * Build the signal context to be used by sigreturn. 156 */ 157 frame.sf_sc.sc_mask = mask; 158 #ifdef VM86 159 if (tf->tf_eflags & PSL_VM) { 160 frame.sf_sc.sc_gs = tf->tf_vm86_gs; 161 frame.sf_sc.sc_fs = tf->tf_vm86_fs; 162 frame.sf_sc.sc_es = tf->tf_vm86_es; 163 frame.sf_sc.sc_ds = tf->tf_vm86_ds; 164 frame.sf_sc.sc_eflags = get_vflags(p); 165 } else 166 #endif 167 { 168 __asm("movl %%gs,%w0" : "=r" (frame.sf_sc.sc_gs)); 169 __asm("movl %%fs,%w0" : "=r" (frame.sf_sc.sc_fs)); 170 frame.sf_sc.sc_es = tf->tf_es; 171 frame.sf_sc.sc_ds = tf->tf_ds; 172 frame.sf_sc.sc_eflags = tf->tf_eflags; 173 } 174 frame.sf_sc.sc_edi = tf->tf_edi; 175 frame.sf_sc.sc_esi = tf->tf_esi; 176 frame.sf_sc.sc_ebp = tf->tf_ebp; 177 frame.sf_sc.sc_ebx = tf->tf_ebx; 178 frame.sf_sc.sc_edx = tf->tf_edx; 179 frame.sf_sc.sc_ecx = tf->tf_ecx; 180 frame.sf_sc.sc_eax = tf->tf_eax; 181 frame.sf_sc.sc_eip = tf->tf_eip; 182 frame.sf_sc.sc_cs = tf->tf_cs; 183 frame.sf_sc.sc_esp_at_signal = tf->tf_esp; 184 frame.sf_sc.sc_ss = tf->tf_ss; 185 frame.sf_sc.sc_err = tf->tf_err; 186 frame.sf_sc.sc_trapno = tf->tf_trapno; 187 188 if (copyout(&frame, fp, sizeof(frame)) != 0) { 189 /* 190 * Process has trashed its stack; give it an illegal 191 * instruction to halt it in its tracks. 192 */ 193 sigexit(p, SIGILL); 194 /* NOTREACHED */ 195 } 196 197 /* 198 * Build context to run handler in. 199 */ 200 tf->tf_es = GSEL(GUDATA_SEL, SEL_UPL); 201 tf->tf_ds = GSEL(GUDATA_SEL, SEL_UPL); 202 tf->tf_eip = (int)(((char *)PS_STRINGS) - 203 (linux_esigcode - linux_sigcode)); 204 tf->tf_cs = GSEL(GUCODE_SEL, SEL_UPL); 205 tf->tf_eflags &= ~(PSL_T|PSL_VM|PSL_AC); 206 tf->tf_esp = (int)fp; 207 tf->tf_ss = GSEL(GUDATA_SEL, SEL_UPL); 208 } 209 210 /* 211 * System call to cleanup state after a signal 212 * has been taken. Reset signal mask and 213 * stack state from context left by sendsig (above). 214 * Return to previous pc and psl as specified by 215 * context left by sendsig. Check carefully to 216 * make sure that the user has not modified the 217 * psl to gain improper privileges or to cause 218 * a machine fault. 219 */ 220 int 221 linux_sys_sigreturn(p, v, retval) 222 struct proc *p; 223 void *v; 224 register_t *retval; 225 { 226 struct linux_sys_sigreturn_args /* { 227 syscallarg(struct linux_sigcontext *) scp; 228 } */ *uap = v; 229 struct linux_sigcontext *scp, context; 230 register struct trapframe *tf; 231 232 tf = p->p_md.md_regs; 233 234 /* 235 * The trampoline code hands us the context. 236 * It is unsafe to keep track of it ourselves, in the event that a 237 * program jumps out of a signal handler. 238 */ 239 scp = SCARG(uap, scp); 240 if (copyin((caddr_t)scp, &context, sizeof(*scp)) != 0) 241 return (EFAULT); 242 243 /* 244 * Restore signal context. 245 */ 246 #ifdef VM86 247 if (context.sc_eflags & PSL_VM) { 248 tf->tf_vm86_gs = context.sc_gs; 249 tf->tf_vm86_fs = context.sc_fs; 250 tf->tf_vm86_es = context.sc_es; 251 tf->tf_vm86_ds = context.sc_ds; 252 set_vflags(p, context.sc_eflags); 253 } else 254 #endif 255 { 256 /* 257 * Check for security violations. If we're returning to 258 * protected mode, the CPU will validate the segment registers 259 * automatically and generate a trap on violations. We handle 260 * the trap, rather than doing all of the checking here. 261 */ 262 if (((context.sc_eflags ^ tf->tf_eflags) & PSL_USERSTATIC) != 0 || 263 !USERMODE(context.sc_cs, context.sc_eflags)) 264 return (EINVAL); 265 266 /* %fs and %gs were restored by the trampoline. */ 267 tf->tf_es = context.sc_es; 268 tf->tf_ds = context.sc_ds; 269 tf->tf_eflags = context.sc_eflags; 270 } 271 tf->tf_edi = context.sc_edi; 272 tf->tf_esi = context.sc_esi; 273 tf->tf_ebp = context.sc_ebp; 274 tf->tf_ebx = context.sc_ebx; 275 tf->tf_edx = context.sc_edx; 276 tf->tf_ecx = context.sc_ecx; 277 tf->tf_eax = context.sc_eax; 278 tf->tf_eip = context.sc_eip; 279 tf->tf_cs = context.sc_cs; 280 tf->tf_esp = context.sc_esp_at_signal; 281 tf->tf_ss = context.sc_ss; 282 283 p->p_sigacts->ps_sigstk.ss_flags &= ~SS_ONSTACK; 284 p->p_sigmask = context.sc_mask & ~sigcantmask; 285 286 return (EJUSTRETURN); 287 } 288 289 #ifdef USER_LDT 290 291 int 292 linux_read_ldt(p, uap, retval) 293 struct proc *p; 294 struct linux_sys_modify_ldt_args /* { 295 syscallarg(int) func; 296 syscallarg(void *) ptr; 297 syscallarg(size_t) bytecount; 298 } */ *uap; 299 register_t *retval; 300 { 301 struct i386_get_ldt_args gl; 302 int error; 303 caddr_t sg; 304 char *parms; 305 306 sg = stackgap_init(p->p_emul); 307 308 gl.start = 0; 309 gl.desc = SCARG(uap, ptr); 310 gl.num = SCARG(uap, bytecount) / sizeof(union descriptor); 311 312 parms = stackgap_alloc(&sg, sizeof(gl)); 313 314 if ((error = copyout(&gl, parms, sizeof(gl))) != 0) 315 return (error); 316 317 if ((error = i386_get_ldt(p, parms, retval)) != 0) 318 return (error); 319 320 *retval *= sizeof(union descriptor); 321 return (0); 322 } 323 324 struct linux_ldt_info { 325 u_int entry_number; 326 u_long base_addr; 327 u_int limit; 328 u_int seg_32bit:1; 329 u_int contents:2; 330 u_int read_exec_only:1; 331 u_int limit_in_pages:1; 332 u_int seg_not_present:1; 333 }; 334 335 int 336 linux_write_ldt(p, uap, retval) 337 struct proc *p; 338 struct linux_sys_modify_ldt_args /* { 339 syscallarg(int) func; 340 syscallarg(void *) ptr; 341 syscallarg(size_t) bytecount; 342 } */ *uap; 343 register_t *retval; 344 { 345 struct linux_ldt_info ldt_info; 346 struct segment_descriptor sd; 347 struct i386_set_ldt_args sl; 348 int error; 349 caddr_t sg; 350 char *parms; 351 352 if (SCARG(uap, bytecount) != sizeof(ldt_info)) 353 return (EINVAL); 354 if ((error = copyin(SCARG(uap, ptr), &ldt_info, sizeof(ldt_info))) != 0) 355 return error; 356 if (ldt_info.contents == 3) 357 return (EINVAL); 358 359 sg = stackgap_init(p->p_emul); 360 361 sd.sd_lobase = ldt_info.base_addr & 0xffffff; 362 sd.sd_hibase = (ldt_info.base_addr >> 24) & 0xff; 363 sd.sd_lolimit = ldt_info.limit & 0xffff; 364 sd.sd_hilimit = (ldt_info.limit >> 16) & 0xf; 365 sd.sd_type = 366 16 | (ldt_info.contents << 2) | (!ldt_info.read_exec_only << 1); 367 sd.sd_dpl = SEL_UPL; 368 sd.sd_p = !ldt_info.seg_not_present; 369 sd.sd_def32 = ldt_info.seg_32bit; 370 sd.sd_gran = ldt_info.limit_in_pages; 371 372 sl.start = ldt_info.entry_number; 373 sl.desc = stackgap_alloc(&sg, sizeof(sd)); 374 sl.num = 1; 375 376 #if 0 377 printf("linux_write_ldt: idx=%d, base=%x, limit=%x\n", 378 ldt_info.entry_number, ldt_info.base_addr, ldt_info.limit); 379 #endif 380 381 parms = stackgap_alloc(&sg, sizeof(sl)); 382 383 if ((error = copyout(&sd, sl.desc, sizeof(sd))) != 0) 384 return (error); 385 if ((error = copyout(&sl, parms, sizeof(sl))) != 0) 386 return (error); 387 388 if ((error = i386_set_ldt(p, parms, retval)) != 0) 389 return (error); 390 391 *retval = 0; 392 return (0); 393 } 394 395 #endif /* USER_LDT */ 396 397 int 398 linux_sys_modify_ldt(p, v, retval) 399 struct proc *p; 400 void *v; 401 register_t *retval; 402 { 403 struct linux_sys_modify_ldt_args /* { 404 syscallarg(int) func; 405 syscallarg(void *) ptr; 406 syscallarg(size_t) bytecount; 407 } */ *uap = v; 408 409 switch (SCARG(uap, func)) { 410 #ifdef USER_LDT 411 case 0: 412 return (linux_read_ldt(p, uap, retval)); 413 414 case 1: 415 return (linux_write_ldt(p, uap, retval)); 416 #endif /* USER_LDT */ 417 418 default: 419 return (ENOSYS); 420 } 421 } 422 423 /* 424 * XXX Pathetic hack to make svgalib work. This will fake the major 425 * device number of an opened VT so that svgalib likes it. grmbl. 426 * Should probably do it 'wrong the right way' and use a mapping 427 * array for all major device numbers, and map linux_mknod too. 428 */ 429 dev_t 430 linux_fakedev(dev) 431 dev_t dev; 432 { 433 434 if (major(dev) == NETBSD_CONS_MAJOR) 435 return makedev(LINUX_CONS_MAJOR, (minor(dev) + 1)); 436 return dev; 437 } 438 439 /* 440 * We come here in a last attempt to satisfy a Linux ioctl() call 441 */ 442 int 443 linux_machdepioctl(p, v, retval) 444 struct proc *p; 445 void *v; 446 register_t *retval; 447 { 448 struct linux_sys_ioctl_args /* { 449 syscallarg(int) fd; 450 syscallarg(u_long) com; 451 syscallarg(caddr_t) data; 452 } */ *uap = v; 453 struct sys_ioctl_args bia; 454 u_long com; 455 #if NVT > 0 456 int error; 457 struct vt_mode lvt; 458 caddr_t bvtp, sg; 459 #endif 460 461 SCARG(&bia, fd) = SCARG(uap, fd); 462 SCARG(&bia, data) = SCARG(uap, data); 463 com = SCARG(uap, com); 464 465 switch (com) { 466 #if NVT > 0 467 case LINUX_KDGKBMODE: 468 com = KDGKBMODE; 469 break; 470 case LINUX_KDSKBMODE: 471 com = KDSKBMODE; 472 if ((unsigned)SCARG(uap, data) == LINUX_K_MEDIUMRAW) 473 SCARG(&bia, data) = (caddr_t)K_RAW; 474 break; 475 case LINUX_KDMKTONE: 476 com = KDMKTONE; 477 break; 478 case LINUX_KDSETMODE: 479 com = KDSETMODE; 480 break; 481 case LINUX_KDENABIO: 482 com = KDENABIO; 483 break; 484 case LINUX_KDDISABIO: 485 com = KDDISABIO; 486 break; 487 case LINUX_KDGETLED: 488 com = KDGETLED; 489 break; 490 case LINUX_KDSETLED: 491 com = KDSETLED; 492 break; 493 case LINUX_VT_OPENQRY: 494 com = VT_OPENQRY; 495 break; 496 case LINUX_VT_GETMODE: 497 SCARG(&bia, com) = VT_GETMODE; 498 if ((error = sys_ioctl(p, &bia, retval))) 499 return error; 500 if ((error = copyin(SCARG(uap, data), (caddr_t)&lvt, 501 sizeof (struct vt_mode)))) 502 return error; 503 lvt.relsig = bsd_to_linux_sig[lvt.relsig]; 504 lvt.acqsig = bsd_to_linux_sig[lvt.acqsig]; 505 lvt.frsig = bsd_to_linux_sig[lvt.frsig]; 506 return copyout((caddr_t)&lvt, SCARG(uap, data), 507 sizeof (struct vt_mode)); 508 case LINUX_VT_SETMODE: 509 com = VT_SETMODE; 510 if ((error = copyin(SCARG(uap, data), (caddr_t)&lvt, 511 sizeof (struct vt_mode)))) 512 return error; 513 lvt.relsig = linux_to_bsd_sig[lvt.relsig]; 514 lvt.acqsig = linux_to_bsd_sig[lvt.acqsig]; 515 lvt.frsig = linux_to_bsd_sig[lvt.frsig]; 516 sg = stackgap_init(p->p_emul); 517 bvtp = stackgap_alloc(&sg, sizeof (struct vt_mode)); 518 if ((error = copyout(&lvt, bvtp, sizeof (struct vt_mode)))) 519 return error; 520 SCARG(&bia, data) = bvtp; 521 break; 522 case LINUX_VT_RELDISP: 523 com = VT_RELDISP; 524 break; 525 case LINUX_VT_ACTIVATE: 526 com = VT_ACTIVATE; 527 break; 528 case LINUX_VT_WAITACTIVE: 529 com = VT_WAITACTIVE; 530 break; 531 #endif 532 default: 533 printf("linux_machdepioctl: invalid ioctl %08lx\n", com); 534 return EINVAL; 535 } 536 SCARG(&bia, com) = com; 537 return sys_ioctl(p, &bia, retval); 538 } 539 540 /* 541 * Set I/O permissions for a process. Just set the maximum level 542 * right away (ignoring the argument), otherwise we would have 543 * to rely on I/O permission maps, which are not implemented. 544 */ 545 int 546 linux_sys_iopl(p, v, retval) 547 struct proc *p; 548 void *v; 549 register_t *retval; 550 { 551 #if 0 552 struct linux_sys_iopl_args /* { 553 syscallarg(int) level; 554 } */ *uap = v; 555 #endif 556 struct trapframe *fp = p->p_md.md_regs; 557 558 if (suser(p->p_ucred, &p->p_acflag) != 0) 559 return EPERM; 560 fp->tf_eflags |= PSL_IOPL; 561 *retval = 0; 562 return 0; 563 } 564 565 /* 566 * See above. If a root process tries to set access to an I/O port, 567 * just let it have the whole range. 568 */ 569 int 570 linux_sys_ioperm(p, v, retval) 571 struct proc *p; 572 void *v; 573 register_t *retval; 574 { 575 struct linux_sys_ioperm_args /* { 576 syscallarg(unsigned int) lo; 577 syscallarg(unsigned int) hi; 578 syscallarg(int) val; 579 } */ *uap = v; 580 struct trapframe *fp = p->p_md.md_regs; 581 582 if (suser(p->p_ucred, &p->p_acflag) != 0) 583 return EPERM; 584 if (SCARG(uap, val)) 585 fp->tf_eflags |= PSL_IOPL; 586 *retval = 0; 587 return 0; 588 } 589