linux_machdep.c revision 1.48.4.1
1 /* $NetBSD: linux_machdep.c,v 1.48.4.1 2017/02/14 16:54:24 snj Exp $ */ 2 3 /*- 4 * Copyright (c) 2005 Emmanuel Dreyfus, 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 * 2. Redistributions in binary form must reproduce the above copyright 12 * notice, this list of conditions and the following disclaimer in the 13 * documentation and/or other materials provided with the distribution. 14 * 3. All advertising materials mentioning features or use of this software 15 * must display the following acknowledgement: 16 * This product includes software developed by Emmanuel Dreyfus 17 * 4. The name of the author may not be used to endorse or promote 18 * products derived from this software without specific prior written 19 * permission. 20 * 21 * THIS SOFTWARE IS PROVIDED BY THE THE AUTHOR AND CONTRIBUTORS ``AS IS'' 22 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, 23 * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 24 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS 25 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 26 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 27 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 28 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 29 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 30 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 31 * POSSIBILITY OF SUCH DAMAGE. 32 */ 33 34 #include <sys/cdefs.h> 35 36 __KERNEL_RCSID(0, "$NetBSD: linux_machdep.c,v 1.48.4.1 2017/02/14 16:54:24 snj Exp $"); 37 38 #include <sys/param.h> 39 #include <sys/types.h> 40 #include <sys/systm.h> 41 #include <sys/signal.h> 42 #include <sys/exec.h> 43 #include <sys/proc.h> 44 #include <sys/ptrace.h> /* for process_read_fpregs() */ 45 #include <sys/ucontext.h> 46 #include <sys/conf.h> 47 48 #include <machine/reg.h> 49 #include <machine/pcb.h> 50 #include <machine/mcontext.h> 51 #include <machine/specialreg.h> 52 #include <machine/vmparam.h> 53 #include <machine/cpufunc.h> 54 #include <x86/include/sysarch.h> 55 56 /* 57 * To see whether wscons is configured (for virtual console ioctl calls). 58 */ 59 #if defined(_KERNEL_OPT) 60 #include "wsdisplay.h" 61 #endif 62 #if (NWSDISPLAY > 0) 63 #include <dev/wscons/wsconsio.h> 64 #include <dev/wscons/wsdisplay_usl_io.h> 65 #endif 66 67 68 #include <compat/linux/common/linux_signal.h> 69 #include <compat/linux/common/linux_errno.h> 70 #include <compat/linux/common/linux_exec.h> 71 #include <compat/linux/common/linux_ioctl.h> 72 #include <compat/linux/common/linux_prctl.h> 73 #include <compat/linux/common/linux_machdep.h> 74 #include <compat/linux/common/linux_ipc.h> 75 #include <compat/linux/common/linux_sem.h> 76 #include <compat/linux/linux_syscall.h> 77 #include <compat/linux/linux_syscallargs.h> 78 79 static void linux_buildcontext(struct lwp *, void *, void *); 80 81 void 82 linux_setregs(struct lwp *l, struct exec_package *epp, vaddr_t stack) 83 { 84 struct pcb *pcb = lwp_getpcb(l); 85 struct trapframe *tf; 86 87 fpu_save_area_clear(l, __NetBSD_NPXCW__); 88 pcb->pcb_flags = 0; 89 90 l->l_proc->p_flag &= ~PK_32; 91 92 tf = l->l_md.md_regs; 93 tf->tf_rax = 0; 94 tf->tf_rbx = 0; 95 tf->tf_rcx = epp->ep_entry; 96 tf->tf_rdx = 0; 97 tf->tf_rsi = 0; 98 tf->tf_rdi = 0; 99 tf->tf_rbp = 0; 100 tf->tf_rsp = stack; 101 tf->tf_r8 = 0; 102 tf->tf_r9 = 0; 103 tf->tf_r10 = 0; 104 tf->tf_r11 = 0; 105 tf->tf_r12 = 0; 106 tf->tf_r13 = 0; 107 tf->tf_r14 = 0; 108 tf->tf_r15 = 0; 109 tf->tf_rip = epp->ep_entry; 110 tf->tf_rflags = PSL_USERSET; 111 tf->tf_cs = GSEL(GUCODE_SEL, SEL_UPL); 112 tf->tf_ss = GSEL(GUDATA_SEL, SEL_UPL); 113 tf->tf_ds = GSEL(GUDATA_SEL, SEL_UPL); 114 tf->tf_es = 0; 115 cpu_fsgs_zero(l); 116 117 return; 118 } 119 120 void 121 linux_sendsig(const ksiginfo_t *ksi, const sigset_t *mask) 122 { 123 struct lwp *l = curlwp; 124 struct proc *p = l->l_proc; 125 struct pcb *pcb = lwp_getpcb(l); 126 struct sigacts *ps = p->p_sigacts; 127 int onstack, error; 128 int sig = ksi->ksi_signo; 129 struct linux_rt_sigframe *sfp, sigframe; 130 struct linux__fpstate *fpsp; 131 struct fpreg fpregs; 132 struct trapframe *tf = l->l_md.md_regs; 133 sig_t catcher = SIGACTION(p, sig).sa_handler; 134 linux_sigset_t lmask; 135 char *sp; 136 137 /* Do we need to jump onto the signal stack? */ 138 onstack = 139 (l->l_sigstk.ss_flags & (SS_DISABLE | SS_ONSTACK)) == 0 && 140 (SIGACTION(p, sig).sa_flags & SA_ONSTACK) != 0; 141 142 /* Allocate space for the signal handler context. */ 143 if (onstack) 144 sp = ((char *)l->l_sigstk.ss_sp + 145 l->l_sigstk.ss_size); 146 else 147 sp = (char *)tf->tf_rsp - 128; 148 149 /* Save FPU state */ 150 sp = (char *) (((long)sp - sizeof (*fpsp)) & ~0xfUL); 151 fpsp = (struct linux__fpstate *)sp; 152 153 /* 154 * Populate the rt_sigframe 155 */ 156 sp = (char *) 157 ((((long)sp - sizeof(struct linux_rt_sigframe)) & ~0xfUL) - 8); 158 sfp = (struct linux_rt_sigframe *)sp; 159 160 memset(&sigframe, 0, sizeof(sigframe)); 161 if (ps->sa_sigdesc[sig].sd_vers != 0) 162 sigframe.pretcode = 163 (char *)(u_long)ps->sa_sigdesc[sig].sd_tramp; 164 else 165 sigframe.pretcode = NULL; 166 167 /* 168 * The user context 169 */ 170 sigframe.uc.luc_flags = 0; 171 sigframe.uc.luc_link = NULL; 172 173 /* This is used regardless of SA_ONSTACK in Linux */ 174 sigframe.uc.luc_stack.ss_sp = l->l_sigstk.ss_sp; 175 sigframe.uc.luc_stack.ss_size = l->l_sigstk.ss_size; 176 sigframe.uc.luc_stack.ss_flags = 0; 177 if (l->l_sigstk.ss_flags & SS_ONSTACK) 178 sigframe.uc.luc_stack.ss_flags |= LINUX_SS_ONSTACK; 179 if (l->l_sigstk.ss_flags & SS_DISABLE) 180 sigframe.uc.luc_stack.ss_flags |= LINUX_SS_DISABLE; 181 182 sigframe.uc.luc_mcontext.r8 = tf->tf_r8; 183 sigframe.uc.luc_mcontext.r9 = tf->tf_r9; 184 sigframe.uc.luc_mcontext.r10 = tf->tf_r10; 185 sigframe.uc.luc_mcontext.r11 = tf->tf_r11; 186 sigframe.uc.luc_mcontext.r12 = tf->tf_r12; 187 sigframe.uc.luc_mcontext.r13 = tf->tf_r13; 188 sigframe.uc.luc_mcontext.r14 = tf->tf_r14; 189 sigframe.uc.luc_mcontext.r15 = tf->tf_r15; 190 sigframe.uc.luc_mcontext.rdi = tf->tf_rdi; 191 sigframe.uc.luc_mcontext.rsi = tf->tf_rsi; 192 sigframe.uc.luc_mcontext.rbp = tf->tf_rbp; 193 sigframe.uc.luc_mcontext.rbx = tf->tf_rbx; 194 sigframe.uc.luc_mcontext.rdx = tf->tf_rdx; 195 sigframe.uc.luc_mcontext.rax = tf->tf_rax; 196 sigframe.uc.luc_mcontext.rcx = tf->tf_rcx; 197 sigframe.uc.luc_mcontext.rsp = tf->tf_rsp; 198 sigframe.uc.luc_mcontext.rip = tf->tf_rip; 199 sigframe.uc.luc_mcontext.eflags = tf->tf_rflags; 200 sigframe.uc.luc_mcontext.cs = tf->tf_cs; 201 sigframe.uc.luc_mcontext.gs = tf->tf_gs; 202 sigframe.uc.luc_mcontext.fs = tf->tf_fs; 203 sigframe.uc.luc_mcontext.err = tf->tf_err; 204 sigframe.uc.luc_mcontext.trapno = tf->tf_trapno; 205 native_to_linux_sigset(&lmask, mask); 206 sigframe.uc.luc_mcontext.oldmask = lmask.sig[0]; 207 sigframe.uc.luc_mcontext.cr2 = (long)pcb->pcb_onfault; 208 sigframe.uc.luc_mcontext.fpstate = fpsp; 209 native_to_linux_sigset(&sigframe.uc.luc_sigmask, mask); 210 native_to_linux_siginfo(&sigframe.info, &ksi->ksi_info); 211 sendsig_reset(l, sig); 212 mutex_exit(p->p_lock); 213 error = 0; 214 215 /* 216 * Save FPU state, if any 217 */ 218 if (fpsp != NULL) { 219 size_t fp_size = sizeof fpregs; 220 /* The netbsd and linux structures both match the fxsave data */ 221 (void)process_read_fpregs(l, &fpregs, &fp_size); 222 error = copyout(&fpregs, fpsp, sizeof(*fpsp)); 223 } 224 225 if (error == 0) 226 error = copyout(&sigframe, sp, sizeof(sigframe)); 227 228 mutex_enter(p->p_lock); 229 230 if (error != 0) { 231 sigexit(l, SIGILL); 232 return; 233 } 234 235 if ((vaddr_t)catcher >= VM_MAXUSER_ADDRESS) { 236 sigexit(l, SIGILL); 237 return; 238 } 239 240 linux_buildcontext(l, catcher, sp); 241 tf->tf_rdi = sigframe.info.lsi_signo; 242 tf->tf_rax = 0; 243 tf->tf_rsi = (long)&sfp->info; 244 tf->tf_rdx = (long)&sfp->uc; 245 246 /* 247 * Remember we use signal stack 248 */ 249 if (onstack) 250 l->l_sigstk.ss_flags |= SS_ONSTACK; 251 return; 252 } 253 254 int 255 linux_sys_modify_ldt(struct lwp *l, const struct linux_sys_modify_ldt_args *v, register_t *retval) 256 { 257 printf("linux_sys_modify_ldt\n"); 258 return 0; 259 } 260 261 int 262 linux_sys_iopl(struct lwp *l, const struct linux_sys_iopl_args *v, register_t *retval) 263 { 264 return 0; 265 } 266 267 int 268 linux_sys_ioperm(struct lwp *l, const struct linux_sys_ioperm_args *v, register_t *retval) 269 { 270 return 0; 271 } 272 273 dev_t 274 linux_fakedev(dev_t dev, int raw) 275 { 276 277 extern const struct cdevsw ptc_cdevsw, pts_cdevsw; 278 const struct cdevsw *cd = cdevsw_lookup(dev); 279 280 if (raw) { 281 #if (NWSDISPLAY > 0) 282 extern const struct cdevsw wsdisplay_cdevsw; 283 if (cd == &wsdisplay_cdevsw) 284 return makedev(LINUX_CONS_MAJOR, (minor(dev) + 1)); 285 #endif 286 } 287 288 if (cd == &ptc_cdevsw) 289 return makedev(LINUX_PTC_MAJOR, minor(dev)); 290 if (cd == &pts_cdevsw) 291 return makedev(LINUX_PTS_MAJOR, minor(dev)); 292 293 return ((minor(dev) & 0xff) | ((major(dev) & 0xfff) << 8) 294 | (((unsigned long long int) (minor(dev) & ~0xff)) << 12) 295 | (((unsigned long long int) (major(dev) & ~0xfff)) << 32)); 296 } 297 298 int 299 linux_machdepioctl(struct lwp *l, const struct linux_sys_ioctl_args *v, register_t *retval) 300 { 301 return 0; 302 } 303 304 int 305 linux_sys_rt_sigreturn(struct lwp *l, const void *v, register_t *retval) 306 { 307 struct linux_ucontext *luctx; 308 struct trapframe *tf = l->l_md.md_regs; 309 struct linux_sigcontext *lsigctx; 310 struct linux_rt_sigframe frame, *fp; 311 ucontext_t uctx; 312 mcontext_t *mctx; 313 struct fxsave *fxarea; 314 int error; 315 316 fp = (struct linux_rt_sigframe *)(tf->tf_rsp - 8); 317 if ((error = copyin(fp, &frame, sizeof(frame))) != 0) { 318 mutex_enter(l->l_proc->p_lock); 319 sigexit(l, SIGILL); 320 return error; 321 } 322 luctx = &frame.uc; 323 lsigctx = &luctx->luc_mcontext; 324 325 memset(&uctx, 0, sizeof(uctx)); 326 mctx = (mcontext_t *)&uctx.uc_mcontext; 327 fxarea = (struct fxsave *)&mctx->__fpregs; 328 329 /* 330 * Set the flags. Linux always have CPU, stack and signal state, 331 * FPU is optional. uc_flags is not used to tell what we have. 332 */ 333 uctx.uc_flags = (_UC_SIGMASK|_UC_CPU|_UC_STACK|_UC_CLRSTACK); 334 if (lsigctx->fpstate != NULL) 335 uctx.uc_flags |= _UC_FPU; 336 uctx.uc_link = NULL; 337 338 /* 339 * Signal set 340 */ 341 linux_to_native_sigset(&uctx.uc_sigmask, &luctx->luc_sigmask); 342 343 /* 344 * CPU state 345 */ 346 mctx->__gregs[_REG_R8] = lsigctx->r8; 347 mctx->__gregs[_REG_R9] = lsigctx->r9; 348 mctx->__gregs[_REG_R10] = lsigctx->r10; 349 mctx->__gregs[_REG_R11] = lsigctx->r11; 350 mctx->__gregs[_REG_R12] = lsigctx->r12; 351 mctx->__gregs[_REG_R13] = lsigctx->r13; 352 mctx->__gregs[_REG_R14] = lsigctx->r14; 353 mctx->__gregs[_REG_R15] = lsigctx->r15; 354 mctx->__gregs[_REG_RDI] = lsigctx->rdi; 355 mctx->__gregs[_REG_RSI] = lsigctx->rsi; 356 mctx->__gregs[_REG_RBP] = lsigctx->rbp; 357 mctx->__gregs[_REG_RBX] = lsigctx->rbx; 358 mctx->__gregs[_REG_RAX] = lsigctx->rax; 359 mctx->__gregs[_REG_RDX] = lsigctx->rdx; 360 mctx->__gregs[_REG_RCX] = lsigctx->rcx; 361 mctx->__gregs[_REG_RIP] = lsigctx->rip; 362 mctx->__gregs[_REG_RFLAGS] = lsigctx->eflags; 363 mctx->__gregs[_REG_CS] = lsigctx->cs; 364 mctx->__gregs[_REG_GS] = lsigctx->gs; 365 mctx->__gregs[_REG_FS] = lsigctx->fs; 366 mctx->__gregs[_REG_ERR] = lsigctx->err; 367 mctx->__gregs[_REG_TRAPNO] = lsigctx->trapno; 368 mctx->__gregs[_REG_ES] = tf->tf_es; 369 mctx->__gregs[_REG_DS] = tf->tf_ds; 370 mctx->__gregs[_REG_RSP] = lsigctx->rsp; /* XXX */ 371 mctx->__gregs[_REG_SS] = tf->tf_ss; 372 373 /* 374 * FPU state 375 */ 376 if (lsigctx->fpstate != NULL) { 377 /* Both structures match the fxstate data */ 378 error = copyin(lsigctx->fpstate, fxarea, sizeof(*fxarea)); 379 if (error != 0) { 380 mutex_enter(l->l_proc->p_lock); 381 sigexit(l, SIGILL); 382 return error; 383 } 384 } 385 386 /* 387 * And the stack 388 */ 389 uctx.uc_stack.ss_flags = 0; 390 if (luctx->luc_stack.ss_flags & LINUX_SS_ONSTACK) 391 uctx.uc_stack.ss_flags |= SS_ONSTACK; 392 393 if (luctx->luc_stack.ss_flags & LINUX_SS_DISABLE) 394 uctx.uc_stack.ss_flags |= SS_DISABLE; 395 396 uctx.uc_stack.ss_sp = luctx->luc_stack.ss_sp; 397 uctx.uc_stack.ss_size = luctx->luc_stack.ss_size; 398 399 /* 400 * And let setucontext deal with that. 401 */ 402 mutex_enter(l->l_proc->p_lock); 403 error = setucontext(l, &uctx); 404 mutex_exit(l->l_proc->p_lock); 405 if (error) 406 return error; 407 408 return EJUSTRETURN; 409 } 410 411 int 412 linux_sys_arch_prctl(struct lwp *l, 413 const struct linux_sys_arch_prctl_args *uap, register_t *retval) 414 { 415 /* { 416 syscallarg(int) code; 417 syscallarg(unsigned long) addr; 418 } */ 419 void *addr = (void *)SCARG(uap, addr); 420 421 switch(SCARG(uap, code)) { 422 case LINUX_ARCH_SET_GS: 423 return x86_set_sdbase(addr, 'g', l, true); 424 425 case LINUX_ARCH_GET_GS: 426 return x86_get_sdbase(addr, 'g'); 427 428 case LINUX_ARCH_SET_FS: 429 return x86_set_sdbase(addr, 'f', l, true); 430 431 case LINUX_ARCH_GET_FS: 432 return x86_get_sdbase(addr, 'f'); 433 434 default: 435 #ifdef DEBUG_LINUX 436 printf("linux_sys_arch_prctl: unexpected code %d\n", 437 SCARG(uap, code)); 438 #endif 439 return EINVAL; 440 } 441 /* NOTREACHED */ 442 } 443 444 const int linux_vsyscall_to_syscall[] = { 445 LINUX_SYS_gettimeofday, 446 LINUX_SYS_time, 447 LINUX_SYS_nosys, /* nosys */ 448 LINUX_SYS_nosys, /* nosys */ 449 }; 450 451 int 452 linux_usertrap(struct lwp *l, vaddr_t trapaddr, void *arg) 453 { 454 struct trapframe *tf = arg; 455 uint64_t retaddr; 456 size_t vsyscallnr; 457 458 /* 459 * Check for a vsyscall. %rip must be the fault address, 460 * and the address must be in the Linux vsyscall area. 461 * Also, vsyscalls are only done at 1024-byte boundaries. 462 */ 463 464 if (__predict_true(trapaddr < LINUX_VSYSCALL_START)) 465 return 0; 466 467 if (trapaddr != tf->tf_rip) 468 return 0; 469 470 if ((tf->tf_rip & (LINUX_VSYSCALL_SIZE - 1)) != 0) 471 return 0; 472 473 vsyscallnr = (tf->tf_rip - LINUX_VSYSCALL_START) / LINUX_VSYSCALL_SIZE; 474 475 if (vsyscallnr > LINUX_VSYSCALL_MAXNR) 476 return 0; 477 478 /* 479 * Get the return address from the top of the stack, 480 * and fix up the return address. 481 * This assumes the faulting instruction was callq *reg, 482 * which is the only way that vsyscalls are ever entered. 483 */ 484 if (copyin((void *)tf->tf_rsp, &retaddr, sizeof retaddr) != 0) 485 return 0; 486 if ((vaddr_t)retaddr >= VM_MAXUSER_ADDRESS) 487 return 0; 488 tf->tf_rip = retaddr; 489 tf->tf_rax = linux_vsyscall_to_syscall[vsyscallnr]; 490 tf->tf_rsp += 8; /* "pop" the return address */ 491 492 #if 0 493 printf("usertrap: rip %p rsp %p retaddr %p vsys %d sys %d\n", 494 (void *)tf->tf_rip, (void *)tf->tf_rsp, (void *)retaddr, 495 vsyscallnr, (int)tf->tf_rax); 496 #endif 497 498 (*l->l_proc->p_md.md_syscall)(tf); 499 500 return 1; 501 } 502 503 static void 504 linux_buildcontext(struct lwp *l, void *catcher, void *f) 505 { 506 struct trapframe *tf = l->l_md.md_regs; 507 508 tf->tf_ds = GSEL(GUDATA_SEL, SEL_UPL); 509 tf->tf_rip = (u_int64_t)catcher; 510 tf->tf_cs = GSEL(GUCODE_SEL, SEL_UPL); 511 tf->tf_rflags &= ~PSL_CLEARSIG; 512 tf->tf_rsp = (u_int64_t)f; 513 tf->tf_ss = GSEL(GUDATA_SEL, SEL_UPL); 514 } 515
Indexes created Tue Sep 30 20:09:53 GMT 2025