1 /* $NetBSD: linux_machdep.c,v 1.4 2001/10/14 17:21:47 manu Exp $ */ 2 3 /*- 4 * Copyright (c) 1995, 2000, 2001 The NetBSD Foundation, Inc. 5 * All rights reserved. 6 * 7 * This code is derived from software contributed to The NetBSD Foundation 8 * by Frank van der Linden and Emmanuel Dreyfus. 9 * 10 * Redistribution and use in source and binary forms, with or without 11 * modification, are permitted provided that the following conditions 12 * are met: 13 * 1. Redistributions of source code must retain the above copyright 14 * notice, this list of conditions and the following disclaimer. 15 * 2. Redistributions in binary form must reproduce the above copyright 16 * notice, this list of conditions and the following disclaimer in the 17 * documentation and/or other materials provided with the distribution. 18 * 3. All advertising materials mentioning features or use of this software 19 * must display the following acknowledgement: 20 * This product includes software developed by the NetBSD 21 * Foundation, Inc. and its contributors. 22 * 4. Neither the name of The NetBSD Foundation nor the names of its 23 * contributors may be used to endorse or promote products derived 24 * from this software without specific prior written permission. 25 * 26 * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS 27 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED 28 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 29 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS 30 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 31 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 32 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 33 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 34 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 35 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 36 * POSSIBILITY OF SUCH DAMAGE. 37 */ 38 39 #include <sys/param.h> 40 #include <sys/systm.h> 41 #include <sys/signalvar.h> 42 #include <sys/kernel.h> 43 #include <sys/map.h> 44 #include <sys/proc.h> 45 #include <sys/user.h> 46 #include <sys/buf.h> 47 #include <sys/reboot.h> 48 #include <sys/conf.h> 49 #include <sys/exec.h> 50 #include <sys/file.h> 51 #include <sys/callout.h> 52 #include <sys/malloc.h> 53 #include <sys/mbuf.h> 54 #include <sys/msgbuf.h> 55 #include <sys/mount.h> 56 #include <sys/vnode.h> 57 #include <sys/device.h> 58 #include <sys/syscallargs.h> 59 #include <sys/filedesc.h> 60 #include <sys/exec_elf.h> 61 #include <sys/disklabel.h> 62 #include <sys/ioctl.h> 63 #include <sys/sysctl.h> 64 #include <miscfs/specfs/specdev.h> 65 66 #include <compat/linux/common/linux_types.h> 67 #include <compat/linux/common/linux_signal.h> 68 #include <compat/linux/common/linux_util.h> 69 #include <compat/linux/common/linux_ioctl.h> 70 #include <compat/linux/common/linux_hdio.h> 71 #include <compat/linux/common/linux_exec.h> 72 #include <compat/linux/common/linux_machdep.h> 73 74 #include <compat/linux/linux_syscallargs.h> 75 76 #include <machine/cpu.h> 77 #include <machine/psl.h> 78 #include <machine/reg.h> 79 #include <machine/regnum.h> 80 #include <machine/vmparam.h> 81 #include <machine/locore.h> 82 83 /* 84 * To see whether wscons is configured (for virtual console ioctl calls). 85 */ 86 #if defined(_KERNEL_OPT) 87 #include "wsdisplay.h" 88 #endif 89 #if (NWSDISPLAY > 0) 90 #include <dev/wscons/wsconsio.h> 91 #include <dev/wscons/wsdisplay_usl_io.h> 92 #endif 93 94 /* 95 * Set set up registers on exec. 96 * XXX not used at the moment since in sys/kern/exec_conf, LINUX_COMPAT 97 * entry uses NetBSD's native setregs instead of linux_setregs 98 */ 99 void 100 linux_setregs(p, pack, stack) 101 struct proc *p; 102 struct exec_package *pack; 103 u_long stack; 104 { 105 setregs(p, pack, stack); 106 return; 107 } 108 109 /* 110 * Send an interrupt to process. 111 * 112 * Adapted from sys/arch/mips/mips/mips_machdep.c 113 * 114 * XXX Does not work well yet with RT signals 115 * 116 */ 117 118 void 119 linux_sendsig(catcher, sig, mask, code) /* XXX Check me */ 120 sig_t catcher; 121 int sig; 122 sigset_t *mask; 123 u_long code; 124 { 125 struct proc *p = curproc; 126 struct linux_sigframe *fp; 127 struct frame *f; 128 int i,onstack; 129 struct linux_sigframe sf; 130 131 #ifdef DEBUG_LINUX 132 printf("linux_sendsig()\n"); 133 #endif /* DEBUG_LINUX */ 134 f = (struct frame *)p->p_md.md_regs; 135 #ifdef DEBUG_LINUX 136 printf("f = %p\n", f); 137 #endif /* DEBUG_LINUX */ 138 139 /* 140 * Do we need to jump onto the signal stack? 141 */ 142 onstack = 143 (p->p_sigctx.ps_sigstk.ss_flags & (SS_DISABLE | SS_ONSTACK)) == 0 && 144 (SIGACTION(p, sig).sa_flags & SA_ONSTACK) != 0; 145 146 /* 147 * Signal stack is broken (see at the end of linux_Sigreturn), so we do 148 * not use it yet. XXX fix this. 149 */ 150 onstack=0; 151 152 /* 153 * Allocate space for the signal handler context. 154 */ 155 if (onstack) 156 fp = (struct linux_sigframe *) 157 ((caddr_t)p->p_sigctx.ps_sigstk.ss_sp 158 + p->p_sigctx.ps_sigstk.ss_size); 159 else 160 /* cast for _MIPS_BSD_API == _MIPS_BSD_API_LP32_64CLEAN case */ 161 fp = (struct linux_sigframe *)(u_int32_t)f->f_regs[SP]; 162 163 #ifdef DEBUG_LINUX 164 printf("fp = %p, sf = %p\n", fp, &sf); 165 #endif /* DEBUG_LINUX */ 166 167 /* 168 * Build stack frame for signal trampoline. 169 */ 170 memset(&sf, 0, sizeof sf); 171 172 /* 173 * This is the signal trampoline used by Linux, we don't use it, 174 * but we set ip up in case an application expects it to be there 175 */ 176 sf.lsf_code[0] = 0x24020000; /* li v0, __NR_sigreturn */ 177 sf.lsf_code[1] = 0x0000000c; /* syscall */ 178 179 native_to_linux_sigset(mask, &sf.lsf_mask); 180 for (i=0; i<32; i++) 181 sf.lsf_sc.lsc_regs[i] = f->f_regs[i]; 182 sf.lsf_sc.lsc_mdhi = f->f_regs[MULHI]; 183 sf.lsf_sc.lsc_mdlo = f->f_regs[MULLO]; 184 sf.lsf_sc.lsc_pc = f->f_regs[PC]; 185 sf.lsf_sc.lsc_status = f->f_regs[SR]; /* XXX */ 186 sf.lsf_sc.lsc_cause = f->f_regs[CAUSE]; 187 sf.lsf_sc.lsc_badvaddr = f->f_regs[BADVADDR]; /* XXX */ 188 189 /* 190 * Save signal stack. XXX broken 191 */ 192 /* kregs.sc_onstack = p->p_sigctx.ps_sigstk.ss_flags & SS_ONSTACK; */ 193 194 /* 195 * Install the sigframe onto the stack 196 */ 197 fp -= sizeof(struct linux_sigframe); 198 if (copyout(&sf, fp, sizeof(sf)) != 0) { 199 /* 200 * Process has trashed its stack; give it an illegal 201 * instruction to halt it in its tracks. 202 */ 203 #ifdef DEBUG_LINUX 204 printf("linux_sendsig: stack trashed\n"); 205 #endif /* DEBUG_LINUX */ 206 sigexit(p, SIGILL); 207 /* NOTREACHED */ 208 } 209 210 /* Set up the registers to return to sigcode. */ 211 f->f_regs[A0] = native_to_linux_sig[sig]; 212 f->f_regs[A1] = 0; 213 f->f_regs[A2] = (unsigned long)&fp->lsf_sc; 214 215 #ifdef DEBUG_LINUX 216 printf("sigcontext is at %p\n", &fp->lsf_sc); 217 #endif /* DEBUG_LINUX */ 218 219 f->f_regs[SP] = (unsigned long)fp; 220 /* Signal trampoline code is at base of user stack. */ 221 f->f_regs[RA] = (unsigned long)p->p_sigctx.ps_sigcode; 222 f->f_regs[T9] = (unsigned long)catcher; 223 f->f_regs[PC] = (unsigned long)catcher; 224 225 /* Remember that we're now on the signal stack. */ 226 if (onstack) 227 p->p_sigctx.ps_sigstk.ss_flags |= SS_ONSTACK; 228 229 return; 230 } 231 232 /* 233 * System call to cleanup state after a signal 234 * has been taken. Reset signal mask and 235 * stack state from context left by sendsig (above). 236 */ 237 int 238 linux_sys_sigreturn(p, v, retval) 239 struct proc *p; 240 void *v; 241 register_t *retval; 242 { 243 struct linux_sys_sigreturn_args /* { 244 syscallarg(struct linux_pt_regs) regs; 245 } */ *uap = v; 246 struct linux_pt_regs regs, kregs; 247 struct linux_sigframe *sf, ksf; 248 struct frame *f; 249 sigset_t mask; 250 int i, error; 251 252 #ifdef DEBUG_LINUX 253 printf("linux_sys_sigreturn()\n"); 254 #endif /* DEBUG_LINUX */ 255 256 /* 257 * The trampoline code hands us the context. 258 * It is unsafe to keep track of it ourselves, in the event that a 259 * program jumps out of a signal handler. 260 */ 261 regs = SCARG(uap, regs); 262 263 kregs = regs; 264 /* if ((error = copyin(regs, &kregs, sizeof(kregs))) != 0) 265 return (error); */ 266 267 sf = (struct linux_sigframe *)kregs.lregs[29]; 268 if ((error = copyin(sf, &ksf, sizeof(ksf))) != 0) 269 return (error); 270 271 /* Restore the register context. */ 272 f = (struct frame *)p->p_md.md_regs; 273 #ifdef DEBUG_LINUX 274 printf("sf = %p, f = %p\n", sf, f); 275 #endif /* DEBUG_LINUX */ 276 for (i=0; i<32; i++) 277 f->f_regs[i] = kregs.lregs[i]; 278 f->f_regs[MULLO] = kregs.llo; 279 f->f_regs[MULHI] = kregs.lhi; 280 f->f_regs[PC] = kregs.lcp0_epc; 281 f->f_regs[BADVADDR] = kregs.lcp0_badvaddr; 282 f->f_regs[CAUSE] = kregs.lcp0_cause; 283 284 /* Restore signal stack. */ 285 p->p_sigctx.ps_sigstk.ss_flags &= ~SS_ONSTACK; 286 287 /* Restore signal mask. */ 288 linux_to_native_sigset((linux_sigset_t *)&ksf.lsf_mask, &mask); 289 (void)sigprocmask1(p, SIG_SETMASK, &mask, 0); 290 291 return (EJUSTRETURN); 292 } 293 294 295 int 296 linux_sys_rt_sigreturn(p, v, retval) 297 struct proc *p; 298 void *v; 299 register_t *retval; 300 { 301 return 0; 302 } 303 304 305 #if 0 306 int 307 linux_sys_modify_ldt(p, v, retval) 308 struct proc *p; 309 void *v; 310 register_t *retval; 311 { 312 /* 313 * This syscall is not implemented in Linux/Mips: we should not 314 * be here 315 */ 316 #ifdef DEBUG_LINUX 317 printf("linux_sys_modify_ldt: should not be here.\n"); 318 #endif /* DEBUG_LINUX */ 319 return 0; 320 } 321 #endif 322 323 /* 324 * major device numbers remapping 325 */ 326 dev_t 327 linux_fakedev(dev) 328 dev_t dev; 329 { 330 /* XXX write me */ 331 return dev; 332 } 333 334 /* 335 * We come here in a last attempt to satisfy a Linux ioctl() call 336 */ 337 int 338 linux_machdepioctl(p, v, retval) 339 struct proc *p; 340 void *v; 341 register_t *retval; 342 { 343 return 0; 344 } 345 346 /* 347 * See above. If a root process tries to set access to an I/O port, 348 * just let it have the whole range. 349 */ 350 int 351 linux_sys_ioperm(p, v, retval) 352 struct proc *p; 353 void *v; 354 register_t *retval; 355 { 356 /* 357 * This syscall is not implemented in Linux/Mips: we should not be here 358 */ 359 #ifdef DEBUG_LINUX 360 printf("linux_sys_ioperm: should not be here.\n"); 361 #endif /* DEBUG_LINUX */ 362 return 0; 363 } 364 365 /* 366 * wrapper linux_sys_new_uname() -> linux_sys_uname() 367 */ 368 int 369 linux_sys_new_uname(p, v, retval) 370 struct proc *p; 371 void *v; 372 register_t *retval; 373 { 374 /* 375 * Use this if you want to try Linux emulation with a glibc-2.2 376 * or higher. Note that signals will not work 377 */ 378 #if 0 379 struct linux_sys_uname_args /* { 380 syscallarg(struct linux_utsname *) up; 381 } */ *uap = v; 382 struct linux_utsname luts; 383 384 strncpy(luts.l_sysname, linux_sysname, sizeof(luts.l_sysname)); 385 strncpy(luts.l_nodename, hostname, sizeof(luts.l_nodename)); 386 strncpy(luts.l_release, "2.4.0", sizeof(luts.l_release)); 387 strncpy(luts.l_version, linux_version, sizeof(luts.l_version)); 388 strncpy(luts.l_machine, machine, sizeof(luts.l_machine)); 389 strncpy(luts.l_domainname, domainname, sizeof(luts.l_domainname)); 390 391 return copyout(&luts, SCARG(uap, up), sizeof(luts)); 392 #else 393 return linux_sys_uname(p, v, retval); 394 #endif 395 } 396 397 /* 398 * In Linux, cacheflush is icurrently implemented 399 * as a whole cache flush (arguments are ignored) 400 * we emulate this broken beahior. 401 */ 402 int 403 linux_sys_cacheflush(p, v, retval) 404 struct proc *p; 405 void *v; 406 register_t *retval; 407 { 408 MachFlushCache(); 409 return 0; 410 } 411 412 /* 413 * This system call is depecated in Linux, but 414 * some binaries and some libraries use it. 415 */ 416 int 417 linux_sys_sysmips(p, v, retval) 418 struct proc *p; 419 void *v; 420 register_t *retval; 421 { 422 struct linux_sys_sysmips_args { 423 syscallarg(int) cmd; 424 syscallarg(int) arg1; 425 syscallarg(int) arg2; 426 syscallarg(int) arg3; 427 } *uap = v; 428 int error; 429 430 switch (SCARG(uap, cmd)) { 431 case LINUX_SETNAME: { 432 char nodename [LINUX___NEW_UTS_LEN + 1]; 433 int name; 434 size_t len; 435 436 if ((error = suser(p->p_ucred, &p->p_acflag)) != 0) 437 return error; 438 if ((error = copyinstr((char *)SCARG(uap, arg1), nodename, 439 LINUX___NEW_UTS_LEN, &len)) != 0) 440 return error; 441 442 name = KERN_HOSTNAME; 443 return (kern_sysctl(&name, 1, 0, 0, nodename, len, p)); 444 445 break; 446 } 447 case LINUX_MIPS_ATOMIC_SET: { 448 void *addr; 449 int s; 450 451 addr = (void *)SCARG(uap, arg1); 452 453 if ((uvm_useracc((caddr_t)addr, sizeof(int), 454 B_READ | B_WRITE)) != 1) 455 return EFAULT; 456 457 s = splhigh(); 458 /* 459 * No error testing here. This is bad, but Linux does 460 * it like this. The source aknowledge "This is broken" 461 * in a comment... 462 */ 463 *retval = (register_t)fubyte(addr); 464 error = subyte(addr, SCARG(uap, arg2)); 465 splx(s); 466 467 return 0; 468 break; 469 } 470 case LINUX_MIPS_FIXADE: /* XXX not implemented */ 471 break; 472 case LINUX_FLUSH_CACHE: 473 MachFlushCache(); 474 break; 475 case LINUX_MIPS_RDNVRAM: 476 return EIO; 477 break; 478 default: 479 return EINVAL; 480 break; 481 } 482 #ifdef DEBUG_LINUX 483 printf("linux_sys_sysmips(): unimplemented command %d\n", 484 SCARG(uap,cmd)); 485 #endif /* DEBUG_LINUX */ 486 return 0; 487 } 488