linux_machdep.c revision 1.41
1 /* $NetBSD: linux_machdep.c,v 1.41 2013/10/23 20:18:51 drochner 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 1.41 2013/10/23 20:18:51 drochner 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 #include <sys/pcu.h> 48 49 #include <machine/reg.h> 50 #include <machine/pcb.h> 51 #include <machine/fpu.h> 52 #include <machine/mcontext.h> 53 #include <machine/specialreg.h> 54 #include <machine/vmparam.h> 55 #include <machine/cpufunc.h> 56 57 /* 58 * To see whether wscons is configured (for virtual console ioctl calls). 59 */ 60 #if defined(_KERNEL_OPT) 61 #include "wsdisplay.h" 62 #endif 63 #if (NWSDISPLAY > 0) 64 #include <dev/wscons/wsconsio.h> 65 #include <dev/wscons/wsdisplay_usl_io.h> 66 #endif 67 68 extern const pcu_ops_t fpu_ops; 69 70 #include <compat/linux/common/linux_signal.h> 71 #include <compat/linux/common/linux_errno.h> 72 #include <compat/linux/common/linux_exec.h> 73 #include <compat/linux/common/linux_ioctl.h> 74 #include <compat/linux/common/linux_prctl.h> 75 #include <compat/linux/common/linux_machdep.h> 76 #include <compat/linux/common/linux_ipc.h> 77 #include <compat/linux/common/linux_sem.h> 78 #include <compat/linux/linux_syscall.h> 79 #include <compat/linux/linux_syscallargs.h> 80 81 static void linux_buildcontext(struct lwp *, void *, void *); 82 83 void 84 linux_setregs(struct lwp *l, struct exec_package *epp, vaddr_t stack) 85 { 86 struct pcb *pcb = lwp_getpcb(l); 87 struct trapframe *tf; 88 89 pcu_discard(&fpu_ops, false); 90 91 pcb->pcb_flags = 0; 92 pcb->pcb_savefpu.fp_fxsave.fx_fcw = __NetBSD_NPXCW__; 93 pcb->pcb_savefpu.fp_fxsave.fx_mxcsr = __INITIAL_MXCSR__; 94 pcb->pcb_savefpu.fp_fxsave.fx_mxcsr_mask = __INITIAL_MXCSR_MASK__; 95 96 l->l_proc->p_flag &= ~PK_32; 97 98 tf = l->l_md.md_regs; 99 tf->tf_rax = 0; 100 tf->tf_rbx = 0; 101 tf->tf_rcx = epp->ep_entry; 102 tf->tf_rdx = 0; 103 tf->tf_rsi = 0; 104 tf->tf_rdi = 0; 105 tf->tf_rbp = 0; 106 tf->tf_rsp = stack; 107 tf->tf_r8 = 0; 108 tf->tf_r9 = 0; 109 tf->tf_r10 = 0; 110 tf->tf_r11 = 0; 111 tf->tf_r12 = 0; 112 tf->tf_r13 = 0; 113 tf->tf_r14 = 0; 114 tf->tf_r15 = 0; 115 tf->tf_rip = epp->ep_entry; 116 tf->tf_rflags = PSL_USERSET; 117 tf->tf_cs = GSEL(GUCODE_SEL, SEL_UPL); 118 tf->tf_ss = GSEL(GUDATA_SEL, SEL_UPL); 119 tf->tf_ds = 0; 120 tf->tf_es = 0; 121 cpu_fsgs_zero(l); 122 123 return; 124 } 125 126 void 127 linux_sendsig(const ksiginfo_t *ksi, const sigset_t *mask) 128 { 129 struct lwp *l = curlwp; 130 struct proc *p = l->l_proc; 131 struct pcb *pcb = lwp_getpcb(l); 132 struct sigacts *ps = p->p_sigacts; 133 int onstack, error; 134 int sig = ksi->ksi_signo; 135 struct linux_rt_sigframe *sfp, sigframe; 136 struct linux__fpstate *fpsp, fpstate; 137 struct fpreg fpregs; 138 struct trapframe *tf = l->l_md.md_regs; 139 sig_t catcher = SIGACTION(p, sig).sa_handler; 140 linux_sigset_t lmask; 141 char *sp; 142 143 /* Do we need to jump onto the signal stack? */ 144 onstack = 145 (l->l_sigstk.ss_flags & (SS_DISABLE | SS_ONSTACK)) == 0 && 146 (SIGACTION(p, sig).sa_flags & SA_ONSTACK) != 0; 147 148 /* Allocate space for the signal handler context. */ 149 if (onstack) 150 sp = ((char *)l->l_sigstk.ss_sp + 151 l->l_sigstk.ss_size); 152 else 153 sp = (char *)tf->tf_rsp - 128; 154 155 /* 156 * Save FPU state, if any 157 */ 158 if (pcu_used_p(&fpu_ops)) { 159 sp = (char *) 160 (((long)sp - sizeof(struct linux__fpstate)) & ~0xfUL); 161 fpsp = (struct linux__fpstate *)sp; 162 } else 163 fpsp = NULL; 164 165 /* 166 * Populate the rt_sigframe 167 */ 168 sp = (char *) 169 ((((long)sp - sizeof(struct linux_rt_sigframe)) & ~0xfUL) - 8); 170 sfp = (struct linux_rt_sigframe *)sp; 171 172 memset(&sigframe, 0, sizeof(sigframe)); 173 if (ps->sa_sigdesc[sig].sd_vers != 0) 174 sigframe.pretcode = 175 (char *)(u_long)ps->sa_sigdesc[sig].sd_tramp; 176 else 177 sigframe.pretcode = NULL; 178 179 /* 180 * The user context 181 */ 182 sigframe.uc.luc_flags = 0; 183 sigframe.uc.luc_link = NULL; 184 185 /* This is used regardless of SA_ONSTACK in Linux */ 186 sigframe.uc.luc_stack.ss_sp = l->l_sigstk.ss_sp; 187 sigframe.uc.luc_stack.ss_size = l->l_sigstk.ss_size; 188 sigframe.uc.luc_stack.ss_flags = 0; 189 if (l->l_sigstk.ss_flags & SS_ONSTACK) 190 sigframe.uc.luc_stack.ss_flags |= LINUX_SS_ONSTACK; 191 if (l->l_sigstk.ss_flags & SS_DISABLE) 192 sigframe.uc.luc_stack.ss_flags |= LINUX_SS_DISABLE; 193 194 sigframe.uc.luc_mcontext.r8 = tf->tf_r8; 195 sigframe.uc.luc_mcontext.r9 = tf->tf_r9; 196 sigframe.uc.luc_mcontext.r10 = tf->tf_r10; 197 sigframe.uc.luc_mcontext.r11 = tf->tf_r11; 198 sigframe.uc.luc_mcontext.r12 = tf->tf_r12; 199 sigframe.uc.luc_mcontext.r13 = tf->tf_r13; 200 sigframe.uc.luc_mcontext.r14 = tf->tf_r14; 201 sigframe.uc.luc_mcontext.r15 = tf->tf_r15; 202 sigframe.uc.luc_mcontext.rdi = tf->tf_rdi; 203 sigframe.uc.luc_mcontext.rsi = tf->tf_rsi; 204 sigframe.uc.luc_mcontext.rbp = tf->tf_rbp; 205 sigframe.uc.luc_mcontext.rbx = tf->tf_rbx; 206 sigframe.uc.luc_mcontext.rdx = tf->tf_rdx; 207 sigframe.uc.luc_mcontext.rax = tf->tf_rax; 208 sigframe.uc.luc_mcontext.rcx = tf->tf_rcx; 209 sigframe.uc.luc_mcontext.rsp = tf->tf_rsp; 210 sigframe.uc.luc_mcontext.rip = tf->tf_rip; 211 sigframe.uc.luc_mcontext.eflags = tf->tf_rflags; 212 sigframe.uc.luc_mcontext.cs = tf->tf_cs; 213 sigframe.uc.luc_mcontext.gs = tf->tf_gs; 214 sigframe.uc.luc_mcontext.fs = tf->tf_fs; 215 sigframe.uc.luc_mcontext.err = tf->tf_err; 216 sigframe.uc.luc_mcontext.trapno = tf->tf_trapno; 217 native_to_linux_sigset(&lmask, mask); 218 sigframe.uc.luc_mcontext.oldmask = lmask.sig[0]; 219 sigframe.uc.luc_mcontext.cr2 = (long)pcb->pcb_onfault; 220 sigframe.uc.luc_mcontext.fpstate = fpsp; 221 native_to_linux_sigset(&sigframe.uc.luc_sigmask, mask); 222 native_to_linux_siginfo(&sigframe.info, &ksi->ksi_info); 223 sendsig_reset(l, sig); 224 mutex_exit(p->p_lock); 225 error = 0; 226 227 /* 228 * Save FPU state, if any 229 */ 230 if (fpsp != NULL) { 231 (void)process_read_fpregs(l, &fpregs); 232 memset(&fpstate, 0, sizeof(fpstate)); 233 fpstate.cwd = fpregs.fp_fcw; 234 fpstate.swd = fpregs.fp_fsw; 235 fpstate.twd = fpregs.fp_ftw; 236 fpstate.fop = fpregs.fp_fop; 237 fpstate.rip = fpregs.fp_rip; 238 fpstate.rdp = fpregs.fp_rdp; 239 fpstate.mxcsr = fpregs.fp_mxcsr; 240 fpstate.mxcsr_mask = fpregs.fp_mxcsr_mask; 241 memcpy(&fpstate.st_space, &fpregs.fp_st, 242 sizeof(fpstate.st_space)); 243 memcpy(&fpstate.xmm_space, &fpregs.fp_xmm, 244 sizeof(fpstate.xmm_space)); 245 error = copyout(&fpstate, fpsp, sizeof(fpstate)); 246 } 247 248 if (error == 0) 249 error = copyout(&sigframe, sp, sizeof(sigframe)); 250 251 mutex_enter(p->p_lock); 252 253 if (error != 0) { 254 sigexit(l, SIGILL); 255 return; 256 } 257 258 linux_buildcontext(l, catcher, sp); 259 tf->tf_rdi = sigframe.info.lsi_signo; 260 tf->tf_rax = 0; 261 tf->tf_rsi = (long)&sfp->info; 262 tf->tf_rdx = (long)&sfp->uc; 263 264 /* 265 * Remember we use signal stack 266 */ 267 if (onstack) 268 l->l_sigstk.ss_flags |= SS_ONSTACK; 269 return; 270 } 271 272 int 273 linux_sys_modify_ldt(struct lwp *l, const struct linux_sys_modify_ldt_args *v, register_t *retval) 274 { 275 printf("linux_sys_modify_ldt\n"); 276 return 0; 277 } 278 279 int 280 linux_sys_iopl(struct lwp *l, const struct linux_sys_iopl_args *v, register_t *retval) 281 { 282 return 0; 283 } 284 285 int 286 linux_sys_ioperm(struct lwp *l, const struct linux_sys_ioperm_args *v, register_t *retval) 287 { 288 return 0; 289 } 290 291 dev_t 292 linux_fakedev(dev_t dev, int raw) 293 { 294 295 extern const struct cdevsw ptc_cdevsw, pts_cdevsw; 296 const struct cdevsw *cd = cdevsw_lookup(dev); 297 298 if (raw) { 299 #if (NWSDISPLAY > 0) 300 extern const struct cdevsw wsdisplay_cdevsw; 301 if (cd == &wsdisplay_cdevsw) 302 return makedev(LINUX_CONS_MAJOR, (minor(dev) + 1)); 303 #endif 304 } 305 306 if (cd == &ptc_cdevsw) 307 return makedev(LINUX_PTC_MAJOR, minor(dev)); 308 if (cd == &pts_cdevsw) 309 return makedev(LINUX_PTS_MAJOR, minor(dev)); 310 311 return ((minor(dev) & 0xff) | ((major(dev) & 0xfff) << 8) 312 | (((unsigned long long int) (minor(dev) & ~0xff)) << 12) 313 | (((unsigned long long int) (major(dev) & ~0xfff)) << 32)); 314 } 315 316 int 317 linux_machdepioctl(struct lwp *l, const struct linux_sys_ioctl_args *v, register_t *retval) 318 { 319 return 0; 320 } 321 322 int 323 linux_sys_rt_sigreturn(struct lwp *l, const void *v, register_t *retval) 324 { 325 struct linux_ucontext *luctx; 326 struct trapframe *tf = l->l_md.md_regs; 327 struct linux_sigcontext *lsigctx; 328 struct linux__fpstate fpstate; 329 struct linux_rt_sigframe frame, *fp; 330 ucontext_t uctx; 331 mcontext_t *mctx; 332 struct fxsave64 *fxarea; 333 int error; 334 335 fp = (struct linux_rt_sigframe *)(tf->tf_rsp - 8); 336 if ((error = copyin(fp, &frame, sizeof(frame))) != 0) { 337 mutex_enter(l->l_proc->p_lock); 338 sigexit(l, SIGILL); 339 return error; 340 } 341 luctx = &frame.uc; 342 lsigctx = &luctx->luc_mcontext; 343 344 memset(&uctx, 0, sizeof(uctx)); 345 mctx = (mcontext_t *)&uctx.uc_mcontext; 346 fxarea = (struct fxsave64 *)&mctx->__fpregs; 347 348 /* 349 * Set the flags. Linux always have CPU, stack and signal state, 350 * FPU is optional. uc_flags is not used to tell what we have. 351 */ 352 uctx.uc_flags = (_UC_SIGMASK|_UC_CPU|_UC_STACK|_UC_CLRSTACK); 353 if (lsigctx->fpstate != NULL) 354 uctx.uc_flags |= _UC_FPU; 355 uctx.uc_link = NULL; 356 357 /* 358 * Signal set 359 */ 360 linux_to_native_sigset(&uctx.uc_sigmask, &luctx->luc_sigmask); 361 362 /* 363 * CPU state 364 */ 365 mctx->__gregs[_REG_R8] = lsigctx->r8; 366 mctx->__gregs[_REG_R9] = lsigctx->r9; 367 mctx->__gregs[_REG_R10] = lsigctx->r10; 368 mctx->__gregs[_REG_R11] = lsigctx->r11; 369 mctx->__gregs[_REG_R12] = lsigctx->r12; 370 mctx->__gregs[_REG_R13] = lsigctx->r13; 371 mctx->__gregs[_REG_R14] = lsigctx->r14; 372 mctx->__gregs[_REG_R15] = lsigctx->r15; 373 mctx->__gregs[_REG_RDI] = lsigctx->rdi; 374 mctx->__gregs[_REG_RSI] = lsigctx->rsi; 375 mctx->__gregs[_REG_RBP] = lsigctx->rbp; 376 mctx->__gregs[_REG_RBX] = lsigctx->rbx; 377 mctx->__gregs[_REG_RAX] = lsigctx->rax; 378 mctx->__gregs[_REG_RDX] = lsigctx->rdx; 379 mctx->__gregs[_REG_RCX] = lsigctx->rcx; 380 mctx->__gregs[_REG_RIP] = lsigctx->rip; 381 mctx->__gregs[_REG_RFLAGS] = lsigctx->eflags; 382 mctx->__gregs[_REG_CS] = lsigctx->cs; 383 mctx->__gregs[_REG_GS] = lsigctx->gs; 384 mctx->__gregs[_REG_FS] = lsigctx->fs; 385 mctx->__gregs[_REG_ERR] = lsigctx->err; 386 mctx->__gregs[_REG_TRAPNO] = lsigctx->trapno; 387 mctx->__gregs[_REG_ES] = tf->tf_es; 388 mctx->__gregs[_REG_DS] = tf->tf_ds; 389 mctx->__gregs[_REG_RSP] = lsigctx->rsp; /* XXX */ 390 mctx->__gregs[_REG_SS] = tf->tf_ss; 391 392 /* 393 * FPU state 394 */ 395 if (lsigctx->fpstate != NULL) { 396 error = copyin(lsigctx->fpstate, &fpstate, sizeof(fpstate)); 397 if (error != 0) { 398 mutex_enter(l->l_proc->p_lock); 399 sigexit(l, SIGILL); 400 return error; 401 } 402 403 fxarea->fx_fcw = fpstate.cwd; 404 fxarea->fx_fsw = fpstate.swd; 405 fxarea->fx_ftw = fpstate.twd; 406 fxarea->fx_fop = fpstate.fop; 407 fxarea->fx_rip = fpstate.rip; 408 fxarea->fx_rdp = fpstate.rdp; 409 fxarea->fx_mxcsr = fpstate.mxcsr; 410 fxarea->fx_mxcsr_mask = fpstate.mxcsr_mask; 411 memcpy(&fxarea->fx_st, &fpstate.st_space, 412 sizeof(fxarea->fx_st)); 413 memcpy(&fxarea->fx_xmm, &fpstate.xmm_space, 414 sizeof(fxarea->fx_xmm)); 415 } 416 417 /* 418 * And the stack 419 */ 420 uctx.uc_stack.ss_flags = 0; 421 if (luctx->luc_stack.ss_flags & LINUX_SS_ONSTACK) 422 uctx.uc_stack.ss_flags |= SS_ONSTACK; 423 424 if (luctx->luc_stack.ss_flags & LINUX_SS_DISABLE) 425 uctx.uc_stack.ss_flags |= SS_DISABLE; 426 427 uctx.uc_stack.ss_sp = luctx->luc_stack.ss_sp; 428 uctx.uc_stack.ss_size = luctx->luc_stack.ss_size; 429 430 /* 431 * And let setucontext deal with that. 432 */ 433 mutex_enter(l->l_proc->p_lock); 434 error = setucontext(l, &uctx); 435 mutex_exit(l->l_proc->p_lock); 436 if (error) 437 return error; 438 439 return EJUSTRETURN; 440 } 441 442 int 443 linux_sys_arch_prctl(struct lwp *l, 444 const struct linux_sys_arch_prctl_args *uap, register_t *retval) 445 { 446 /* { 447 syscallarg(int) code; 448 syscallarg(unsigned long) addr; 449 } */ 450 void *addr = (void *)SCARG(uap, addr); 451 452 switch(SCARG(uap, code)) { 453 case LINUX_ARCH_SET_GS: 454 return x86_set_sdbase(addr, 'g', l, true); 455 456 case LINUX_ARCH_GET_GS: 457 return x86_get_sdbase(addr, 'g'); 458 459 case LINUX_ARCH_SET_FS: 460 return x86_set_sdbase(addr, 'f', l, true); 461 462 case LINUX_ARCH_GET_FS: 463 return x86_get_sdbase(addr, 'f'); 464 465 default: 466 #ifdef DEBUG_LINUX 467 printf("linux_sys_arch_prctl: unexpected code %d\n", 468 SCARG(uap, code)); 469 #endif 470 return EINVAL; 471 } 472 /* NOTREACHED */ 473 } 474 475 const int linux_vsyscall_to_syscall[] = { 476 LINUX_SYS_gettimeofday, 477 LINUX_SYS_time, 478 LINUX_SYS_nosys, /* nosys */ 479 LINUX_SYS_nosys, /* nosys */ 480 }; 481 482 int 483 linux_usertrap(struct lwp *l, vaddr_t trapaddr, void *arg) 484 { 485 struct trapframe *tf = arg; 486 uint64_t retaddr; 487 int vsyscallnr; 488 489 /* 490 * Check for a vsyscall. %rip must be the fault address, 491 * and the address must be in the Linux vsyscall area. 492 * Also, vsyscalls are only done at 1024-byte boundaries. 493 */ 494 495 if (__predict_true(trapaddr < LINUX_VSYSCALL_START)) 496 return 0; 497 498 if (trapaddr != tf->tf_rip) 499 return 0; 500 501 if ((tf->tf_rip & (LINUX_VSYSCALL_SIZE - 1)) != 0) 502 return 0; 503 504 vsyscallnr = (tf->tf_rip - LINUX_VSYSCALL_START) / LINUX_VSYSCALL_SIZE; 505 506 if (vsyscallnr > LINUX_VSYSCALL_MAXNR) 507 return 0; 508 509 /* 510 * Get the return address from the top of the stack, 511 * and fix up the return address. 512 * This assumes the faulting instruction was callq *reg, 513 * which is the only way that vsyscalls are ever entered. 514 */ 515 if (copyin((void *)tf->tf_rsp, &retaddr, sizeof retaddr) != 0) 516 return 0; 517 tf->tf_rip = retaddr; 518 tf->tf_rax = linux_vsyscall_to_syscall[vsyscallnr]; 519 tf->tf_rsp += 8; /* "pop" the return address */ 520 521 #if 0 522 printf("usertrap: rip %p rsp %p retaddr %p vsys %d sys %d\n", 523 (void *)tf->tf_rip, (void *)tf->tf_rsp, (void *)retaddr, 524 vsyscallnr, (int)tf->tf_rax); 525 #endif 526 527 (*l->l_proc->p_md.md_syscall)(tf); 528 529 return 1; 530 } 531 532 static void 533 linux_buildcontext(struct lwp *l, void *catcher, void *f) 534 { 535 struct trapframe *tf = l->l_md.md_regs; 536 537 tf->tf_ds = GSEL(GUDATA_SEL, SEL_UPL); 538 tf->tf_rip = (u_int64_t)catcher; 539 tf->tf_cs = GSEL(GUCODE_SEL, SEL_UPL); 540 tf->tf_rflags &= ~PSL_CLEARSIG; 541 tf->tf_rsp = (u_int64_t)f; 542 tf->tf_ss = GSEL(GUDATA_SEL, SEL_UPL); 543 } 544
Indexes created Tue Sep 30 20:09:53 GMT 2025