1 /* $NetBSD: linux_machdep.c,v 1.39 2009/11/23 00:46:07 rmind 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 * 19 * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS 20 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED 21 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 22 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS 23 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 24 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 25 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 26 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 27 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 28 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 29 * POSSIBILITY OF SUCH DAMAGE. 30 */ 31 32 #include <sys/cdefs.h> 33 __KERNEL_RCSID(0, "$NetBSD: linux_machdep.c,v 1.39 2009/11/23 00:46:07 rmind Exp $"); 34 35 #include <sys/param.h> 36 #include <sys/systm.h> 37 #include <sys/signalvar.h> 38 #include <sys/kernel.h> 39 #include <sys/proc.h> 40 #include <sys/buf.h> 41 #include <sys/reboot.h> 42 #include <sys/conf.h> 43 #include <sys/exec.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/syscallargs.h> 53 #include <sys/filedesc.h> 54 #include <sys/exec_elf.h> 55 #include <sys/disklabel.h> 56 #include <sys/ioctl.h> 57 #include <sys/sysctl.h> 58 #include <sys/kauth.h> 59 #include <miscfs/specfs/specdev.h> 60 61 #include <compat/linux/common/linux_types.h> 62 #include <compat/linux/common/linux_signal.h> 63 #include <compat/linux/common/linux_util.h> 64 #include <compat/linux/common/linux_ioctl.h> 65 #include <compat/linux/common/linux_hdio.h> 66 #include <compat/linux/common/linux_exec.h> 67 #include <compat/linux/common/linux_machdep.h> 68 69 #include <compat/linux/linux_syscallargs.h> 70 71 #include <sys/cpu.h> 72 #include <machine/psl.h> 73 #include <machine/reg.h> 74 #include <machine/regnum.h> 75 #include <machine/vmparam.h> 76 #include <machine/locore.h> 77 78 #include <mips/cache.h> 79 80 /* 81 * To see whether wscons is configured (for virtual console ioctl calls). 82 */ 83 #if defined(_KERNEL_OPT) 84 #include "wsdisplay.h" 85 #endif 86 #if (NWSDISPLAY > 0) 87 #include <dev/wscons/wsconsio.h> 88 #include <dev/wscons/wsdisplay_usl_io.h> 89 #endif 90 91 /* 92 * Set set up registers on exec. 93 * XXX not used at the moment since in sys/kern/exec_conf, LINUX_COMPAT 94 * entry uses NetBSD's native setregs instead of linux_setregs 95 */ 96 void 97 linux_setregs(struct lwp *l, struct exec_package *pack, u_long stack) 98 { 99 setregs(l, pack, stack); 100 return; 101 } 102 103 /* 104 * Send an interrupt to process. 105 * 106 * Adapted from sys/arch/mips/mips/mips_machdep.c 107 * 108 * XXX Does not work well yet with RT signals 109 * 110 */ 111 112 void 113 linux_sendsig(const ksiginfo_t *ksi, const sigset_t *mask) 114 { 115 const int sig = ksi->ksi_signo; 116 struct lwp *l = curlwp; 117 struct proc *p = l->l_proc; 118 struct linux_sigframe *fp; 119 struct frame *f; 120 int i, onstack, error; 121 sig_t catcher = SIGACTION(p, sig).sa_handler; 122 struct linux_sigframe sf; 123 124 #ifdef DEBUG_LINUX 125 printf("linux_sendsig()\n"); 126 #endif /* DEBUG_LINUX */ 127 f = (struct frame *)l->l_md.md_regs; 128 129 /* 130 * Do we need to jump onto the signal stack? 131 */ 132 onstack = 133 (l->l_sigstk.ss_flags & (SS_DISABLE | SS_ONSTACK)) == 0 && 134 (SIGACTION(p, sig).sa_flags & SA_ONSTACK) != 0; 135 136 /* 137 * Signal stack is broken (see at the end of linux_sigreturn), so we do 138 * not use it yet. XXX fix this. 139 */ 140 onstack=0; 141 142 /* 143 * Allocate space for the signal handler context. 144 */ 145 if (onstack) 146 fp = (struct linux_sigframe *) 147 ((uint8_t *)l->l_sigstk.ss_sp 148 + l->l_sigstk.ss_size); 149 else 150 /* cast for _MIPS_BSD_API == _MIPS_BSD_API_LP32_64CLEAN case */ 151 fp = (struct linux_sigframe *)(u_int32_t)f->f_regs[_R_SP]; 152 153 /* 154 * Build stack frame for signal trampoline. 155 */ 156 memset(&sf, 0, sizeof sf); 157 158 /* 159 * This is the signal trampoline used by Linux, we don't use it, 160 * but we set it up in case an application expects it to be there 161 */ 162 sf.lsf_code[0] = 0x24020000; /* li v0, __NR_sigreturn */ 163 sf.lsf_code[1] = 0x0000000c; /* syscall */ 164 165 native_to_linux_sigset(&sf.lsf_mask, mask); 166 for (i=0; i<32; i++) { 167 sf.lsf_sc.lsc_regs[i] = f->f_regs[i]; 168 } 169 sf.lsf_sc.lsc_mdhi = f->f_regs[_R_MULHI]; 170 sf.lsf_sc.lsc_mdlo = f->f_regs[_R_MULLO]; 171 sf.lsf_sc.lsc_pc = f->f_regs[_R_PC]; 172 sf.lsf_sc.lsc_status = f->f_regs[_R_SR]; 173 sf.lsf_sc.lsc_cause = f->f_regs[_R_CAUSE]; 174 sf.lsf_sc.lsc_badvaddr = f->f_regs[_R_BADVADDR]; 175 sendsig_reset(l, sig); 176 177 /* 178 * Save signal stack. XXX broken 179 */ 180 /* kregs.sc_onstack = l->l_sigstk.ss_flags & SS_ONSTACK; */ 181 182 /* 183 * Install the sigframe onto the stack 184 */ 185 fp -= sizeof(struct linux_sigframe); 186 mutex_exit(p->p_lock); 187 error = copyout(&sf, fp, sizeof(sf)); 188 mutex_enter(p->p_lock); 189 190 if (error != 0) { 191 /* 192 * Process has trashed its stack; give it an illegal 193 * instruction to halt it in its tracks. 194 */ 195 #ifdef DEBUG_LINUX 196 printf("linux_sendsig: stack trashed\n"); 197 #endif /* DEBUG_LINUX */ 198 sigexit(l, SIGILL); 199 /* NOTREACHED */ 200 } 201 202 /* Set up the registers to return to sigcode. */ 203 f->f_regs[_R_A0] = native_to_linux_signo[sig]; 204 f->f_regs[_R_A1] = 0; 205 f->f_regs[_R_A2] = (unsigned long)&fp->lsf_sc; 206 207 #ifdef DEBUG_LINUX 208 printf("sigcontext is at %p\n", &fp->lsf_sc); 209 #endif /* DEBUG_LINUX */ 210 211 f->f_regs[_R_SP] = (unsigned long)fp; 212 /* Signal trampoline code is at base of user stack. */ 213 f->f_regs[_R_RA] = (unsigned long)p->p_sigctx.ps_sigcode; 214 f->f_regs[_R_T9] = (unsigned long)catcher; 215 f->f_regs[_R_PC] = (unsigned long)catcher; 216 217 /* Remember that we're now on the signal stack. */ 218 if (onstack) 219 l->l_sigstk.ss_flags |= SS_ONSTACK; 220 221 return; 222 } 223 224 /* 225 * System call to cleanup state after a signal 226 * has been taken. Reset signal mask and 227 * stack state from context left by sendsig (above). 228 */ 229 int 230 linux_sys_sigreturn(struct lwp *l, const struct linux_sys_sigreturn_args *uap, register_t *retval) 231 { 232 /* { 233 syscallarg(struct linux_sigframe *) sf; 234 } */ 235 struct proc *p = l->l_proc; 236 struct linux_sigframe *sf, ksf; 237 struct frame *f; 238 sigset_t mask; 239 int i, error; 240 241 #ifdef DEBUG_LINUX 242 printf("linux_sys_sigreturn()\n"); 243 #endif /* DEBUG_LINUX */ 244 245 /* 246 * The trampoline code hands us the context. 247 * It is unsafe to keep track of it ourselves, in the event that a 248 * program jumps out of a signal handler. 249 */ 250 sf = SCARG(uap, sf); 251 252 if ((error = copyin(sf, &ksf, sizeof(ksf))) != 0) 253 return (error); 254 255 /* Restore the register context. */ 256 f = (struct frame *)l->l_md.md_regs; 257 for (i=0; i<32; i++) 258 f->f_regs[i] = ksf.lsf_sc.lsc_regs[i]; 259 f->f_regs[_R_MULLO] = ksf.lsf_sc.lsc_mdlo; 260 f->f_regs[_R_MULHI] = ksf.lsf_sc.lsc_mdhi; 261 f->f_regs[_R_PC] = ksf.lsf_sc.lsc_pc; 262 f->f_regs[_R_BADVADDR] = ksf.lsf_sc.lsc_badvaddr; 263 f->f_regs[_R_CAUSE] = ksf.lsf_sc.lsc_cause; 264 265 mutex_enter(p->p_lock); 266 267 /* Restore signal stack. */ 268 l->l_sigstk.ss_flags &= ~SS_ONSTACK; 269 270 /* Restore signal mask. */ 271 linux_to_native_sigset(&mask, (linux_sigset_t *)&ksf.lsf_mask); 272 (void)sigprocmask1(l, SIG_SETMASK, &mask, 0); 273 274 mutex_exit(p->p_lock); 275 276 return (EJUSTRETURN); 277 } 278 279 280 int 281 linux_sys_rt_sigreturn(struct lwp *l, const void *v, register_t *retval) 282 { 283 return (ENOSYS); 284 } 285 286 287 #if 0 288 int 289 linux_sys_modify_ldt(struct lwp *l, const struct linux_sys_modify_ldt_args *uap, register_t *retval) 290 { 291 /* 292 * This syscall is not implemented in Linux/Mips: we should not 293 * be here 294 */ 295 #ifdef DEBUG_LINUX 296 printf("linux_sys_modify_ldt: should not be here.\n"); 297 #endif /* DEBUG_LINUX */ 298 return 0; 299 } 300 #endif 301 302 /* 303 * major device numbers remapping 304 */ 305 dev_t 306 linux_fakedev(dev_t dev, int raw) 307 { 308 /* XXX write me */ 309 return dev; 310 } 311 312 /* 313 * We come here in a last attempt to satisfy a Linux ioctl() call 314 */ 315 int 316 linux_machdepioctl(struct lwp *l, const struct linux_sys_ioctl_args *uap, register_t *retval) 317 { 318 return 0; 319 } 320 321 /* 322 * See above. If a root process tries to set access to an I/O port, 323 * just let it have the whole range. 324 */ 325 int 326 linux_sys_ioperm(struct lwp *l, const struct linux_sys_ioperm_args *uap, register_t *retval) 327 { 328 /* 329 * This syscall is not implemented in Linux/Mips: we should not be here 330 */ 331 #ifdef DEBUG_LINUX 332 printf("linux_sys_ioperm: should not be here.\n"); 333 #endif /* DEBUG_LINUX */ 334 return 0; 335 } 336 337 /* 338 * wrapper linux_sys_new_uname() -> linux_sys_uname() 339 */ 340 int 341 linux_sys_new_uname(struct lwp *l, const struct linux_sys_new_uname_args *uap, register_t *retval) 342 { 343 /* 344 * Use this if you want to try Linux emulation with a glibc-2.2 345 * or higher. Note that signals will not work 346 */ 347 #if 0 348 struct linux_sys_uname_args /* { 349 syscallarg(struct linux_utsname *) up; 350 } */ *uap = v; 351 struct linux_utsname luts; 352 353 strlcpy(luts.l_sysname, linux_sysname, sizeof(luts.l_sysname)); 354 strlcpy(luts.l_nodename, hostname, sizeof(luts.l_nodename)); 355 strlcpy(luts.l_release, "2.4.0", sizeof(luts.l_release)); 356 strlcpy(luts.l_version, linux_version, sizeof(luts.l_version)); 357 strlcpy(luts.l_machine, machine, sizeof(luts.l_machine)); 358 strlcpy(luts.l_domainname, domainname, sizeof(luts.l_domainname)); 359 360 return copyout(&luts, SCARG(uap, up), sizeof(luts)); 361 #else 362 return linux_sys_uname(l, (const void *)uap, retval); 363 #endif 364 } 365 366 /* 367 * In Linux, cacheflush is currently implemented 368 * as a whole cache flush (arguments are ignored) 369 * we emulate this broken beahior. 370 */ 371 int 372 linux_sys_cacheflush(struct lwp *l, const struct linux_sys_cacheflush_args *uap, register_t *retval) 373 { 374 mips_icache_sync_all(); 375 mips_dcache_wbinv_all(); 376 return 0; 377 } 378 379 /* 380 * This system call is depecated in Linux, but 381 * some binaries and some libraries use it. 382 */ 383 int 384 linux_sys_sysmips(struct lwp *l, const struct linux_sys_sysmips_args *uap, register_t *retval) 385 { 386 #if 0 387 struct linux_sys_sysmips_args { 388 syscallarg(int) cmd; 389 syscallarg(int) arg1; 390 syscallarg(int) arg2; 391 syscallarg(int) arg3; 392 } *uap = v; 393 #endif 394 int error; 395 396 switch (SCARG(uap, cmd)) { 397 case LINUX_SETNAME: { 398 char nodename [LINUX___NEW_UTS_LEN + 1]; 399 int name[2]; 400 size_t len; 401 402 if ((error = copyinstr((char *)SCARG(uap, arg1), nodename, 403 LINUX___NEW_UTS_LEN, &len)) != 0) 404 return error; 405 406 name[0] = CTL_KERN; 407 name[1] = KERN_HOSTNAME; 408 return (old_sysctl(&name[0], 2, 0, 0, nodename, len, NULL)); 409 410 break; 411 } 412 case LINUX_MIPS_ATOMIC_SET: { 413 void *addr; 414 int s; 415 u_int8_t value = 0; 416 417 addr = (void *)SCARG(uap, arg1); 418 419 s = splhigh(); 420 /* 421 * No error testing here. This is bad, but Linux does 422 * it like this. The source aknowledge "This is broken" 423 * in a comment... 424 */ 425 (void) copyin(addr, &value, 1); 426 *retval = value; 427 value = (u_int8_t) SCARG(uap, arg2); 428 error = copyout(&value, addr, 1); 429 splx(s); 430 431 return 0; 432 break; 433 } 434 case LINUX_MIPS_FIXADE: /* XXX not implemented */ 435 break; 436 case LINUX_FLUSH_CACHE: 437 mips_icache_sync_all(); 438 mips_dcache_wbinv_all(); 439 break; 440 case LINUX_MIPS_RDNVRAM: 441 return EIO; 442 break; 443 default: 444 return EINVAL; 445 break; 446 } 447 #ifdef DEBUG_LINUX 448 printf("linux_sys_sysmips(): unimplemented command %d\n", 449 SCARG(uap,cmd)); 450 #endif /* DEBUG_LINUX */ 451 return 0; 452 } 453 454 int 455 linux_usertrap(struct lwp *l, vaddr_t trapaddr, void *arg) 456 { 457 return 0; 458 } 459