linux_machdep.c revision 1.18
1 /* $NetBSD: linux_machdep.c,v 1.18 1995/09/08 07:57:15 fvdl 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 <sys/param.h> 35 #include <sys/systm.h> 36 #include <sys/signalvar.h> 37 #include <sys/kernel.h> 38 #include <sys/map.h> 39 #include <sys/proc.h> 40 #include <sys/user.h> 41 #include <sys/buf.h> 42 #include <sys/reboot.h> 43 #include <sys/conf.h> 44 #include <sys/file.h> 45 #include <sys/callout.h> 46 #include <sys/malloc.h> 47 #include <sys/mbuf.h> 48 #include <sys/msgbuf.h> 49 #include <sys/mount.h> 50 #include <sys/vnode.h> 51 #include <sys/device.h> 52 #include <sys/sysctl.h> 53 #include <sys/syscallargs.h> 54 #include <sys/filedesc.h> 55 56 #include <compat/linux/linux_types.h> 57 #include <compat/linux/linux_signal.h> 58 #include <compat/linux/linux_syscallargs.h> 59 #include <compat/linux/linux_util.h> 60 61 #include <machine/cpu.h> 62 #include <machine/cpufunc.h> 63 #include <machine/psl.h> 64 #include <machine/reg.h> 65 #include <machine/segments.h> 66 #include <machine/specialreg.h> 67 #include <machine/sysarch.h> 68 #include <machine/linux_machdep.h> 69 70 /* 71 * To see whether pcvt is configured (for virtual console ioctl calls). 72 */ 73 #include "vt.h" 74 #if NVT > 0 75 #include <arch/i386/isa/pcvt/pcvt_ioctl.h> 76 #endif 77 78 /* 79 * Deal with some i386-specific things in the Linux emulation code. 80 * This means just signals for now, will include stuff like 81 * I/O map permissions and V86 mode sometime. 82 */ 83 84 /* 85 * Send an interrupt to process. 86 * 87 * Stack is set up to allow sigcode stored 88 * in u. to call routine, followed by kcall 89 * to sigreturn routine below. After sigreturn 90 * resets the signal mask, the stack, and the 91 * frame pointer, it returns to the user 92 * specified pc, psl. 93 */ 94 95 void 96 linux_sendsig(catcher, sig, mask, code) 97 sig_t catcher; 98 int sig, mask; 99 u_long code; 100 { 101 register struct proc *p = curproc; 102 register struct trapframe *tf; 103 struct linux_sigframe *fp, frame; 104 struct sigacts *psp = p->p_sigacts; 105 int oonstack; 106 extern char linux_sigcode[], linux_esigcode[]; 107 108 tf = p->p_md.md_regs; 109 oonstack = psp->ps_sigstk.ss_flags & SS_ONSTACK; 110 111 /* 112 * Allocate space for the signal handler context. 113 */ 114 if ((psp->ps_flags & SAS_ALTSTACK) && !oonstack && 115 (psp->ps_sigonstack & sigmask(sig))) { 116 fp = (struct linux_sigframe *)(psp->ps_sigstk.ss_base + 117 psp->ps_sigstk.ss_size - sizeof(struct linux_sigframe)); 118 psp->ps_sigstk.ss_flags |= SS_ONSTACK; 119 } else { 120 fp = (struct linux_sigframe *)tf->tf_esp - 1; 121 } 122 123 frame.sf_handler = catcher; 124 frame.sf_sig = bsd_to_linux_sig[sig]; 125 126 /* 127 * Build the signal context to be used by sigreturn. 128 */ 129 frame.sf_sc.sc_mask = mask; 130 #ifdef VM86 131 if (tf->tf_eflags & PSL_VM) { 132 frame.sf_sc.sc_gs = tf->tf_vm86_gs; 133 frame.sf_sc.sc_fs = tf->tf_vm86_fs; 134 frame.sf_sc.sc_es = tf->tf_vm86_es; 135 frame.sf_sc.sc_ds = tf->tf_vm86_ds; 136 } else 137 #endif 138 { 139 __asm("movl %%gs,%w0" : "=r" (frame.sf_sc.sc_gs)); 140 __asm("movl %%fs,%w0" : "=r" (frame.sf_sc.sc_fs)); 141 frame.sf_sc.sc_es = tf->tf_es; 142 frame.sf_sc.sc_ds = tf->tf_ds; 143 } 144 frame.sf_sc.sc_edi = tf->tf_edi; 145 frame.sf_sc.sc_esi = tf->tf_esi; 146 frame.sf_sc.sc_ebp = tf->tf_ebp; 147 frame.sf_sc.sc_ebx = tf->tf_ebx; 148 frame.sf_sc.sc_edx = tf->tf_edx; 149 frame.sf_sc.sc_ecx = tf->tf_ecx; 150 frame.sf_sc.sc_eax = tf->tf_eax; 151 frame.sf_sc.sc_eip = tf->tf_eip; 152 frame.sf_sc.sc_cs = tf->tf_cs; 153 frame.sf_sc.sc_eflags = tf->tf_eflags; 154 frame.sf_sc.sc_esp_at_signal = tf->tf_esp; 155 frame.sf_sc.sc_ss = tf->tf_ss; 156 frame.sf_sc.sc_err = tf->tf_err; 157 frame.sf_sc.sc_trapno = tf->tf_trapno; 158 159 if (copyout(&frame, fp, sizeof(frame)) != 0) { 160 /* 161 * Process has trashed its stack; give it an illegal 162 * instruction to halt it in its tracks. 163 */ 164 sigexit(p, SIGILL); 165 /* NOTREACHED */ 166 } 167 168 /* 169 * Build context to run handler in. 170 */ 171 tf->tf_esp = (int)fp; 172 tf->tf_eip = (int)(((char *)PS_STRINGS) - 173 (linux_esigcode - linux_sigcode)); 174 #ifdef VM86 175 tf->tf_eflags &= ~PSL_VM; 176 #endif 177 tf->tf_cs = LSEL(LUCODE_SEL, SEL_UPL); 178 tf->tf_ds = LSEL(LUDATA_SEL, SEL_UPL); 179 tf->tf_es = LSEL(LUDATA_SEL, SEL_UPL); 180 tf->tf_ss = LSEL(LUDATA_SEL, SEL_UPL); 181 } 182 183 /* 184 * System call to cleanup state after a signal 185 * has been taken. Reset signal mask and 186 * stack state from context left by sendsig (above). 187 * Return to previous pc and psl as specified by 188 * context left by sendsig. Check carefully to 189 * make sure that the user has not modified the 190 * psl to gain improper privileges or to cause 191 * a machine fault. 192 */ 193 int 194 linux_sigreturn(p, uap, retval) 195 struct proc *p; 196 struct linux_sigreturn_args /* { 197 syscallarg(struct linux_sigcontext *) scp; 198 } */ *uap; 199 register_t *retval; 200 { 201 struct linux_sigcontext *scp, context; 202 register struct trapframe *tf; 203 204 tf = p->p_md.md_regs; 205 206 /* 207 * The trampoline code hands us the context. 208 * It is unsafe to keep track of it ourselves, in the event that a 209 * program jumps out of a signal handler. 210 */ 211 scp = SCARG(uap, scp); 212 if (copyin((caddr_t)scp, &context, sizeof(*scp)) != 0) 213 return (EFAULT); 214 215 /* 216 * Check for security violations. 217 */ 218 if (((context.sc_eflags ^ tf->tf_eflags) & PSL_USERSTATIC) != 0 || 219 ISPL(context.sc_cs) != SEL_UPL) 220 return (EINVAL); 221 222 p->p_sigacts->ps_sigstk.ss_flags &= ~SS_ONSTACK; 223 p->p_sigmask = context.sc_mask & ~sigcantmask; 224 225 /* 226 * Restore signal context. 227 */ 228 #ifdef VM86 229 if (context.sc_eflags & PSL_VM) { 230 tf->tf_vm86_gs = context.sc_gs; 231 tf->tf_vm86_fs = context.sc_fs; 232 tf->tf_vm86_es = context.sc_es; 233 tf->tf_vm86_ds = context.sc_ds; 234 } else 235 #endif 236 { 237 /* %fs and %gs were restored by the trampoline. */ 238 tf->tf_es = context.sc_es; 239 tf->tf_ds = context.sc_ds; 240 } 241 tf->tf_edi = context.sc_edi; 242 tf->tf_esi = context.sc_esi; 243 tf->tf_ebp = context.sc_ebp; 244 tf->tf_ebx = context.sc_ebx; 245 tf->tf_edx = context.sc_edx; 246 tf->tf_ecx = context.sc_ecx; 247 tf->tf_eax = context.sc_eax; 248 tf->tf_eip = context.sc_eip; 249 tf->tf_cs = context.sc_cs; 250 tf->tf_eflags = context.sc_eflags; 251 tf->tf_esp = context.sc_esp_at_signal; 252 tf->tf_ss = context.sc_ss; 253 254 return (EJUSTRETURN); 255 } 256 257 #ifdef USER_LDT 258 259 int 260 linux_read_ldt(p, uap, retval) 261 struct proc *p; 262 struct linux_modify_ldt_args /* { 263 syscallarg(int) func; 264 syscallarg(void *) ptr; 265 syscallarg(size_t) bytecount; 266 } */ *uap; 267 register_t *retval; 268 { 269 struct i386_get_ldt_args gl; 270 int error; 271 caddr_t sg; 272 char *parms; 273 274 sg = stackgap_init(p->p_emul); 275 276 gl.start = 0; 277 gl.desc = SCARG(uap, ptr); 278 gl.num = SCARG(uap, bytecount) / sizeof(union descriptor); 279 280 parms = stackgap_alloc(&sg, sizeof(gl)); 281 282 if (error = copyout(&gl, parms, sizeof(gl))) 283 return (error); 284 285 if (error = i386_get_ldt(p, parms, retval)) 286 return (error); 287 288 *retval *= sizeof(union descriptor); 289 return (0); 290 } 291 292 struct linux_ldt_info { 293 u_int entry_number; 294 u_long base_addr; 295 u_int limit; 296 u_int seg_32bit:1; 297 u_int contents:2; 298 u_int read_exec_only:1; 299 u_int limit_in_pages:1; 300 u_int seg_not_present:1; 301 }; 302 303 int 304 linux_write_ldt(p, uap, retval) 305 struct proc *p; 306 struct linux_modify_ldt_args /* { 307 syscallarg(int) func; 308 syscallarg(void *) ptr; 309 syscallarg(size_t) bytecount; 310 } */ *uap; 311 register_t *retval; 312 { 313 struct linux_ldt_info ldt_info; 314 struct segment_descriptor sd; 315 struct i386_set_ldt_args sl; 316 int error; 317 caddr_t sg; 318 char *parms; 319 320 if (SCARG(uap, bytecount) != sizeof(ldt_info)) 321 return (EINVAL); 322 if (error = copyin(SCARG(uap, ptr), &ldt_info, sizeof(ldt_info))) 323 return error; 324 if (ldt_info.contents == 3) 325 return (EINVAL); 326 327 sg = stackgap_init(p->p_emul); 328 329 sd.sd_lobase = ldt_info.base_addr & 0xffffff; 330 sd.sd_hibase = (ldt_info.base_addr >> 24) & 0xff; 331 sd.sd_lolimit = ldt_info.limit & 0xffff; 332 sd.sd_hilimit = (ldt_info.limit >> 16) & 0xf; 333 sd.sd_type = 334 16 | (ldt_info.contents << 2) | (!ldt_info.read_exec_only << 1); 335 sd.sd_dpl = SEL_UPL; 336 sd.sd_p = !ldt_info.seg_not_present; 337 sd.sd_def32 = ldt_info.seg_32bit; 338 sd.sd_gran = ldt_info.limit_in_pages; 339 340 sl.start = ldt_info.entry_number; 341 sl.desc = stackgap_alloc(&sg, sizeof(sd)); 342 sl.num = 1; 343 344 #if 0 345 printf("linux_write_ldt: idx=%d, base=%x, limit=%x\n", 346 ldt_info.entry_number, ldt_info.base_addr, ldt_info.limit); 347 #endif 348 349 parms = stackgap_alloc(&sg, sizeof(sl)); 350 351 if (error = copyout(&sd, sl.desc, sizeof(sd))) 352 return (error); 353 if (error = copyout(&sl, parms, sizeof(sl))) 354 return (error); 355 356 if (error = i386_set_ldt(p, parms, retval)) 357 return (error); 358 359 *retval = 0; 360 return (0); 361 } 362 363 #endif /* USER_LDT */ 364 365 int 366 linux_modify_ldt(p, uap, retval) 367 struct proc *p; 368 struct linux_modify_ldt_args /* { 369 syscallarg(int) func; 370 syscallarg(void *) ptr; 371 syscallarg(size_t) bytecount; 372 } */ *uap; 373 register_t *retval; 374 { 375 376 switch (SCARG(uap, func)) { 377 #ifdef USER_LDT 378 case 0: 379 return (linux_read_ldt(p, uap, retval)); 380 381 case 1: 382 return (linux_write_ldt(p, uap, retval)); 383 #endif /* USER_LDT */ 384 385 default: 386 return (ENOSYS); 387 } 388 } 389 390 /* 391 * XXX Pathetic hack to make svgalib work. This will fake the major 392 * device number of an opened VT so that svgalib likes it. grmbl. 393 * Should probably do it 'wrong the right way' and use a mapping 394 * array for all major device numbers, and map linux_mknod too. 395 */ 396 dev_t 397 linux_fakedev(dev) 398 dev_t dev; 399 { 400 if (major(dev) == NETBSD_CONS_MAJOR) 401 return makedev(LINUX_CONS_MAJOR, (minor(dev) + 1)); 402 return dev; 403 } 404 405 /* 406 * We come here in a last attempt to satisfy a Linux ioctl() call 407 */ 408 int 409 linux_machdepioctl(p, uap, retval) 410 struct proc *p; 411 struct linux_ioctl_args /* { 412 syscallarg(int) fd; 413 syscallarg(u_long) com; 414 syscallarg(caddr_t) data; 415 } */ *uap; 416 register_t *retval; 417 { 418 struct ioctl_args bia, tmparg; 419 u_long com; 420 #if NVT > 0 421 int error, mode; 422 struct vt_mode lvt; 423 caddr_t bvtp, sg; 424 u_int fd; 425 struct file *fp; 426 struct filedesc *fdp; 427 #endif 428 429 SCARG(&bia, fd) = SCARG(uap, fd); 430 SCARG(&bia, data) = SCARG(uap, data); 431 com = SCARG(uap, com); 432 433 switch (com) { 434 #if NVT > 0 435 case LINUX_KDGKBMODE: 436 /* 437 * Could be implemented but somehow KDGKBMODE is the 438 * same as KBDGLEDS. 439 */ 440 mode = K_XLATE; 441 return copyout(&mode, SCARG(uap, data), sizeof mode); 442 case LINUX_KDSKBMODE: 443 com = KDSKBMODE; 444 if ((unsigned)SCARG(uap, data) == LINUX_K_MEDIUMRAW) 445 SCARG(&bia, data) = (caddr_t)K_RAW; 446 break; 447 case LINUX_KDMKTONE: 448 com = KDMKTONE; 449 break; 450 case LINUX_KDSETMODE: 451 com = KDSETMODE; 452 break; 453 case LINUX_KDENABIO: 454 com = KDENABIO; 455 break; 456 case LINUX_KDDISABIO: 457 com = KDDISABIO; 458 break; 459 case LINUX_KDGETLED: 460 com = KDGETLED; 461 break; 462 case LINUX_KDSETLED: 463 com = KDSETLED; 464 break; 465 case LINUX_VT_OPENQRY: 466 com = VT_OPENQRY; 467 break; 468 case LINUX_VT_GETMODE: 469 SCARG(&bia, com) = VT_GETMODE; 470 if ((error = ioctl(p, &bia, retval))) 471 return error; 472 if ((error = copyin(SCARG(uap, data), (caddr_t)&lvt, 473 sizeof (struct vt_mode)))) 474 return error; 475 lvt.relsig = bsd_to_linux_sig[lvt.relsig]; 476 lvt.acqsig = bsd_to_linux_sig[lvt.acqsig]; 477 lvt.frsig = bsd_to_linux_sig[lvt.frsig]; 478 return copyout((caddr_t)&lvt, SCARG(uap, data), 479 sizeof (struct vt_mode)); 480 case LINUX_VT_SETMODE: 481 com = VT_SETMODE; 482 if ((error = copyin(SCARG(uap, data), (caddr_t)&lvt, 483 sizeof (struct vt_mode)))) 484 return error; 485 lvt.relsig = linux_to_bsd_sig[lvt.relsig]; 486 lvt.acqsig = linux_to_bsd_sig[lvt.acqsig]; 487 lvt.frsig = linux_to_bsd_sig[lvt.frsig]; 488 sg = stackgap_init(p->p_emul); 489 bvtp = stackgap_alloc(&sg, sizeof (struct vt_mode)); 490 if ((error = copyout(&lvt, bvtp, sizeof (struct vt_mode)))) 491 return error; 492 SCARG(&bia, data) = bvtp; 493 break; 494 case LINUX_VT_RELDISP: 495 com = VT_RELDISP; 496 break; 497 case LINUX_VT_ACTIVATE: 498 com = VT_ACTIVATE; 499 break; 500 case LINUX_VT_WAITACTIVE: 501 com = VT_WAITACTIVE; 502 break; 503 #endif 504 default: 505 return EINVAL; 506 } 507 SCARG(&bia, com) = com; 508 return ioctl(p, &bia, retval); 509 } 510 511 /* 512 * Set I/O permissions for a process. Just set the maximum level 513 * right away (ignoring the argument), otherwise we would have 514 * to rely on I/O permission maps, which are not implemented. 515 */ 516 int 517 linux_iopl(p, uap, retval) 518 struct proc *p; 519 struct linux_iopl_args /* { 520 syscallarg(int) level; 521 } */ *uap; 522 register_t *retval; 523 { 524 struct trapframe *fp = p->p_md.md_regs; 525 526 if (suser(p->p_ucred, &p->p_acflag) != 0) 527 return EPERM; 528 fp->tf_eflags |= PSL_IOPL; 529 *retval = 0; 530 return 0; 531 } 532 533 /* 534 * See above. If a root process tries to set access to an I/O port, 535 * just let it have the whole range. 536 */ 537 int 538 linux_ioperm(p, uap, retval) 539 struct proc *p; 540 struct linux_ioperm_args /* { 541 syscallarg(unsigned int) lo; 542 syscallarg(unsigned int) hi; 543 syscallarg(int) val; 544 } */ *uap; 545 register_t *retval; 546 { 547 struct trapframe *fp = p->p_md.md_regs; 548 549 if (suser(p->p_ucred, &p->p_acflag) != 0) 550 return EPERM; 551 if (SCARG(uap, val)) 552 fp->tf_eflags |= PSL_IOPL; 553 *retval = 0; 554 return 0; 555 } 556
Indexes created Wed Oct 01 19:09:53 GMT 2025