linux_machdep.c revision 1.17.2.1
1 /* $NetBSD: linux_machdep.c,v 1.17.2.1 2007/02/27 16:53:35 yamt 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 1.17.2.1 2007/02/27 16:53:35 yamt 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/user.h> 46 #include <sys/wait.h> 47 #include <sys/ucontext.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 56 #include <compat/linux/common/linux_signal.h> 57 #include <compat/linux/common/linux_errno.h> 58 #include <compat/linux/common/linux_exec.h> 59 #include <compat/linux/common/linux_ioctl.h> 60 #include <compat/linux/common/linux_prctl.h> 61 #include <compat/linux/common/linux_machdep.h> 62 #include <compat/linux/linux_syscall.h> 63 #include <compat/linux/linux_syscallargs.h> 64 65 static void linux_buildcontext(struct lwp *, void *, void *); 66 67 void 68 linux_setregs(l, epp, stack) 69 struct lwp *l; 70 struct exec_package *epp; 71 u_long stack; 72 { 73 struct pcb *pcb = &l->l_addr->u_pcb; 74 struct trapframe *tf; 75 76 /* If we were using the FPU, forget about it. */ 77 if (l->l_addr->u_pcb.pcb_fpcpu != NULL) 78 fpusave_lwp(l, 0); 79 80 l->l_md.md_flags &= ~MDP_USEDFPU; 81 pcb->pcb_flags = 0; 82 pcb->pcb_savefpu.fp_fxsave.fx_fcw = __NetBSD_NPXCW__; 83 pcb->pcb_savefpu.fp_fxsave.fx_mxcsr = __INITIAL_MXCSR__; 84 pcb->pcb_savefpu.fp_fxsave.fx_mxcsr_mask = __INITIAL_MXCSR_MASK__; 85 pcb->pcb_fs = 0; 86 pcb->pcb_gs = 0; 87 88 l->l_proc->p_flag &= ~PK_32; 89 90 tf = l->l_md.md_regs; 91 tf->tf_rax = 0; 92 tf->tf_rbx = 0; 93 tf->tf_rcx = epp->ep_entry; 94 tf->tf_rdx = 0; 95 tf->tf_rsi = 0; 96 tf->tf_rdi = 0; 97 tf->tf_rbp = 0; 98 tf->tf_rsp = stack; 99 tf->tf_r8 = 0; 100 tf->tf_r9 = 0; 101 tf->tf_r10 = 0; 102 tf->tf_r11 = 0; 103 tf->tf_r12 = 0; 104 tf->tf_r13 = 0; 105 tf->tf_r14 = 0; 106 tf->tf_r15 = 0; 107 tf->tf_rip = epp->ep_entry; 108 tf->tf_rflags = PSL_USERSET; 109 tf->tf_cs = GSEL(GUCODE_SEL, SEL_UPL); 110 tf->tf_ss = GSEL(GUDATA_SEL, SEL_UPL); 111 tf->tf_ds = 0; 112 tf->tf_es = 0; 113 tf->tf_fs = 0; 114 tf->tf_gs = 0; 115 116 return; 117 } 118 119 void 120 linux_sendsig(ksi, mask) 121 const ksiginfo_t *ksi; 122 const sigset_t *mask; 123 { 124 struct lwp *l = curlwp; 125 struct proc *p = l->l_proc; 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, fpstate; 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 = ((caddr_t)l->l_sigstk.ss_sp + 145 l->l_sigstk.ss_size); 146 else 147 sp = (caddr_t)tf->tf_rsp - 128; 148 149 /* 150 * Save FPU state, if any 151 */ 152 if (l->l_md.md_flags & MDP_USEDFPU) { 153 sp = (char *) 154 (((long)sp - sizeof(struct linux__fpstate)) & ~0xfUL); 155 fpsp = (struct linux__fpstate *)sp; 156 } else 157 fpsp = NULL; 158 159 /* 160 * Populate the rt_sigframe 161 */ 162 sp = (char *) 163 ((((long)sp - sizeof(struct linux_rt_sigframe)) & ~0xfUL) - 8); 164 sfp = (struct linux_rt_sigframe *)sp; 165 166 bzero(&sigframe, sizeof(sigframe)); 167 if (ps->sa_sigdesc[sig].sd_vers != 0) 168 sigframe.pretcode = 169 (char *)(u_long)ps->sa_sigdesc[sig].sd_tramp; 170 else 171 sigframe.pretcode = NULL; 172 173 /* 174 * The user context 175 */ 176 sigframe.uc.luc_flags = 0; 177 sigframe.uc.luc_link = NULL; 178 179 /* This is used regardless of SA_ONSTACK in Linux */ 180 sigframe.uc.luc_stack.ss_sp = l->l_sigstk.ss_sp; 181 sigframe.uc.luc_stack.ss_size = l->l_sigstk.ss_size; 182 sigframe.uc.luc_stack.ss_flags = 0; 183 if (l->l_sigstk.ss_flags & SS_ONSTACK) 184 sigframe.uc.luc_stack.ss_flags |= LINUX_SS_ONSTACK; 185 if (l->l_sigstk.ss_flags & SS_DISABLE) 186 sigframe.uc.luc_stack.ss_flags |= LINUX_SS_DISABLE; 187 188 sigframe.uc.luc_mcontext.r8 = tf->tf_r8; 189 sigframe.uc.luc_mcontext.r9 = tf->tf_r9; 190 sigframe.uc.luc_mcontext.r10 = tf->tf_r10; 191 sigframe.uc.luc_mcontext.r11 = tf->tf_r11; 192 sigframe.uc.luc_mcontext.r12 = tf->tf_r12; 193 sigframe.uc.luc_mcontext.r13 = tf->tf_r13; 194 sigframe.uc.luc_mcontext.r14 = tf->tf_r14; 195 sigframe.uc.luc_mcontext.r15 = tf->tf_r15; 196 sigframe.uc.luc_mcontext.rdi = tf->tf_rdi; 197 sigframe.uc.luc_mcontext.rsi = tf->tf_rsi; 198 sigframe.uc.luc_mcontext.rbp = tf->tf_rbp; 199 sigframe.uc.luc_mcontext.rbx = tf->tf_rbx; 200 sigframe.uc.luc_mcontext.rdx = tf->tf_rdx; 201 sigframe.uc.luc_mcontext.rcx = tf->tf_rcx; 202 sigframe.uc.luc_mcontext.rsp = tf->tf_rsp; 203 sigframe.uc.luc_mcontext.rip = tf->tf_rip; 204 sigframe.uc.luc_mcontext.eflags = tf->tf_rflags; 205 sigframe.uc.luc_mcontext.cs = tf->tf_cs; 206 sigframe.uc.luc_mcontext.gs = tf->tf_gs; 207 sigframe.uc.luc_mcontext.fs = tf->tf_fs; 208 sigframe.uc.luc_mcontext.err = tf->tf_err; 209 sigframe.uc.luc_mcontext.trapno = tf->tf_trapno; 210 native_to_linux_sigset(&lmask, mask); 211 sigframe.uc.luc_mcontext.oldmask = lmask.sig[0]; 212 sigframe.uc.luc_mcontext.cr2 = (long)l->l_addr->u_pcb.pcb_onfault; 213 sigframe.uc.luc_mcontext.fpstate = fpsp; 214 native_to_linux_sigset(&sigframe.uc.luc_sigmask, mask); 215 216 /* 217 * the siginfo structure 218 */ 219 sigframe.info.lsi_signo = native_to_linux_signo[sig]; 220 sigframe.info.lsi_errno = native_to_linux_errno[ksi->ksi_errno]; 221 sigframe.info.lsi_code = ksi->ksi_code; 222 223 /* XXX This is a rought conversion, taken from i386 code */ 224 switch (sigframe.info.lsi_signo) { 225 case LINUX_SIGILL: 226 case LINUX_SIGFPE: 227 case LINUX_SIGSEGV: 228 case LINUX_SIGBUS: 229 case LINUX_SIGTRAP: 230 sigframe.info._sifields._sigfault._addr = ksi->ksi_addr; 231 break; 232 case LINUX_SIGCHLD: 233 sigframe.info._sifields._sigchld._pid = ksi->ksi_pid; 234 sigframe.info._sifields._sigchld._uid = ksi->ksi_uid; 235 sigframe.info._sifields._sigchld._utime = ksi->ksi_utime; 236 sigframe.info._sifields._sigchld._stime = ksi->ksi_stime; 237 238 if (WCOREDUMP(ksi->ksi_status)) { 239 sigframe.info.lsi_code = LINUX_CLD_DUMPED; 240 sigframe.info._sifields._sigchld._status = 241 _WSTATUS(ksi->ksi_status); 242 } else if (_WSTATUS(ksi->ksi_status)) { 243 sigframe.info.lsi_code = LINUX_CLD_KILLED; 244 sigframe.info._sifields._sigchld._status = 245 _WSTATUS(ksi->ksi_status); 246 } else { 247 sigframe.info.lsi_code = LINUX_CLD_EXITED; 248 sigframe.info._sifields._sigchld._status = 249 ((ksi->ksi_status & 0xff00U) >> 8); 250 } 251 break; 252 case LINUX_SIGIO: 253 sigframe.info._sifields._sigpoll._band = ksi->ksi_band; 254 sigframe.info._sifields._sigpoll._fd = ksi->ksi_fd; 255 break; 256 default: 257 sigframe.info._sifields._sigchld._pid = ksi->ksi_pid; 258 sigframe.info._sifields._sigchld._uid = ksi->ksi_uid; 259 if ((sigframe.info.lsi_signo == LINUX_SIGALRM) || 260 (sigframe.info.lsi_signo >= LINUX_SIGRTMIN)) 261 sigframe.info._sifields._timer._sigval.sival_ptr = 262 ksi->ksi_sigval.sival_ptr; 263 break; 264 } 265 266 sendsig_reset(l, sig); 267 mutex_exit(&p->p_smutex); 268 error = 0; 269 270 /* 271 * Save FPU state, if any 272 */ 273 if (fpsp != NULL) { 274 (void)process_read_fpregs(l, &fpregs); 275 bzero(&fpstate, sizeof(fpstate)); 276 fpstate.cwd = fpregs.fp_fcw; 277 fpstate.swd = fpregs.fp_fsw; 278 fpstate.twd = fpregs.fp_ftw; 279 fpstate.fop = fpregs.fp_fop; 280 fpstate.rip = fpregs.fp_rip; 281 fpstate.rdp = fpregs.fp_rdp; 282 fpstate.mxcsr = fpregs.fp_mxcsr; 283 fpstate.mxcsr_mask = fpregs.fp_mxcsr_mask; 284 memcpy(&fpstate.st_space, &fpregs.fp_st, 285 sizeof(fpstate.st_space)); 286 memcpy(&fpstate.xmm_space, &fpregs.fp_xmm, 287 sizeof(fpstate.xmm_space)); 288 error = copyout(&fpstate, fpsp, sizeof(fpstate)); 289 } 290 291 if (error == 0) 292 error = copyout(&sigframe, sp, sizeof(sigframe)); 293 294 mutex_enter(&p->p_smutex); 295 296 if (error != 0) { 297 sigexit(l, SIGILL); 298 return; 299 } 300 301 linux_buildcontext(l, catcher, sp); 302 tf->tf_rdi = sigframe.info.lsi_signo; 303 tf->tf_rax = 0; 304 tf->tf_rsi = (long)&sfp->info; 305 tf->tf_rdx = (long)&sfp->uc; 306 307 /* 308 * Remember we use signal stack 309 */ 310 if (onstack) 311 l->l_sigstk.ss_flags |= SS_ONSTACK; 312 return; 313 } 314 315 int 316 linux_sys_modify_ldt(l, v, retval) 317 struct lwp *l; 318 void *v; 319 register_t *retval; 320 { 321 printf("linux_sys_modify_ldt\n"); 322 return 0; 323 } 324 325 int 326 linux_sys_iopl(l, v, retval) 327 struct lwp *l; 328 void *v; 329 register_t *retval; 330 { 331 return 0; 332 } 333 334 int 335 linux_sys_ioperm(l, v, retval) 336 struct lwp *l; 337 void *v; 338 register_t *retval; 339 { 340 return 0; 341 } 342 343 dev_t 344 linux_fakedev(dev, raw) 345 dev_t dev; 346 int raw; 347 { 348 return ((minor(dev) & 0xff) | ((major(dev) & 0xfff) << 8) 349 | (((unsigned long long int) (minor(dev) & ~0xff)) << 12) 350 | (((unsigned long long int) (major(dev) & ~0xfff)) << 32)); 351 } 352 353 int 354 linux_machdepioctl(l, v, retval) 355 struct lwp *l; 356 void *v; 357 register_t *retval; 358 { 359 return 0; 360 } 361 362 int 363 linux_sys_rt_sigreturn(l, v, retval) 364 struct lwp *l; 365 void *v; 366 register_t *retval; 367 { 368 struct linux_ucontext *luctx; 369 struct trapframe *tf = l->l_md.md_regs; 370 struct linux_sigcontext *lsigctx; 371 struct linux__fpstate fpstate; 372 struct linux_rt_sigframe frame, *fp; 373 ucontext_t uctx; 374 mcontext_t *mctx; 375 struct fxsave64 *fxsave; 376 int error; 377 378 fp = (struct linux_rt_sigframe *)(tf->tf_rsp - 8); 379 if ((error = copyin(fp, &frame, sizeof(frame))) != 0) { 380 mutex_enter(&l->l_proc->p_smutex); 381 sigexit(l, SIGILL); 382 return error; 383 } 384 luctx = &frame.uc; 385 lsigctx = &luctx->luc_mcontext; 386 387 bzero(&uctx, sizeof(uctx)); 388 mctx = (mcontext_t *)&uctx.uc_mcontext; 389 fxsave = (struct fxsave64 *)&mctx->__fpregs; 390 391 /* 392 * Set the flags. Linux always have CPU, stack and signal state, 393 * FPU is optional. uc_flags is not used to tell what we have. 394 */ 395 uctx.uc_flags = (_UC_SIGMASK|_UC_CPU|_UC_STACK|_UC_CLRSTACK); 396 if (lsigctx->fpstate != NULL) 397 uctx.uc_flags |= _UC_FPU; 398 uctx.uc_link = NULL; 399 400 /* 401 * Signal set 402 */ 403 linux_to_native_sigset(&uctx.uc_sigmask, &luctx->luc_sigmask); 404 405 /* 406 * CPU state 407 */ 408 mctx->__gregs[_REG_R8] = lsigctx->r8; 409 mctx->__gregs[_REG_R9] = lsigctx->r9; 410 mctx->__gregs[_REG_R10] = lsigctx->r10; 411 mctx->__gregs[_REG_R11] = lsigctx->r11; 412 mctx->__gregs[_REG_R12] = lsigctx->r12; 413 mctx->__gregs[_REG_R13] = lsigctx->r13; 414 mctx->__gregs[_REG_R14] = lsigctx->r14; 415 mctx->__gregs[_REG_R15] = lsigctx->r15; 416 mctx->__gregs[_REG_RDI] = lsigctx->rdi; 417 mctx->__gregs[_REG_RSI] = lsigctx->rsi; 418 mctx->__gregs[_REG_RBP] = lsigctx->rbp; 419 mctx->__gregs[_REG_RBX] = lsigctx->rbx; 420 mctx->__gregs[_REG_RAX] = tf->tf_rax; 421 mctx->__gregs[_REG_RDX] = lsigctx->rdx; 422 mctx->__gregs[_REG_RCX] = lsigctx->rcx; 423 mctx->__gregs[_REG_RIP] = lsigctx->rip; 424 mctx->__gregs[_REG_RFL] = lsigctx->eflags; 425 mctx->__gregs[_REG_CS] = lsigctx->cs; 426 mctx->__gregs[_REG_GS] = lsigctx->gs; 427 mctx->__gregs[_REG_FS] = lsigctx->fs; 428 mctx->__gregs[_REG_ERR] = lsigctx->err; 429 mctx->__gregs[_REG_TRAPNO] = lsigctx->trapno; 430 mctx->__gregs[_REG_ES] = tf->tf_es; 431 mctx->__gregs[_REG_DS] = tf->tf_ds; 432 mctx->__gregs[_REG_URSP] = lsigctx->rsp; /* XXX */ 433 mctx->__gregs[_REG_SS] = tf->tf_ss; 434 435 /* 436 * FPU state 437 */ 438 if (lsigctx->fpstate != NULL) { 439 error = copyin(lsigctx->fpstate, &fpstate, sizeof(fpstate)); 440 if (error != 0) { 441 mutex_enter(&l->l_proc->p_smutex); 442 sigexit(l, SIGILL); 443 return error; 444 } 445 446 fxsave->fx_fcw = fpstate.cwd; 447 fxsave->fx_fsw = fpstate.swd; 448 fxsave->fx_ftw = fpstate.twd; 449 fxsave->fx_fop = fpstate.fop; 450 fxsave->fx_rip = fpstate.rip; 451 fxsave->fx_rdp = fpstate.rdp; 452 fxsave->fx_mxcsr = fpstate.mxcsr; 453 fxsave->fx_mxcsr_mask = fpstate.mxcsr_mask; 454 memcpy(&fxsave->fx_st, &fpstate.st_space, 455 sizeof(fxsave->fx_st)); 456 memcpy(&fxsave->fx_xmm, &fpstate.xmm_space, 457 sizeof(fxsave->fx_xmm)); 458 } 459 460 /* 461 * And the stack 462 */ 463 uctx.uc_stack.ss_flags = 0; 464 if (luctx->luc_stack.ss_flags & LINUX_SS_ONSTACK); 465 uctx.uc_stack.ss_flags = SS_ONSTACK; 466 467 if (luctx->luc_stack.ss_flags & LINUX_SS_DISABLE); 468 uctx.uc_stack.ss_flags = SS_DISABLE; 469 470 uctx.uc_stack.ss_sp = luctx->luc_stack.ss_sp; 471 uctx.uc_stack.ss_size = luctx->luc_stack.ss_size; 472 473 /* 474 * And let setucontext deal with that. 475 */ 476 mutex_enter(&l->l_proc->p_smutex); 477 error = setucontext(l, &uctx); 478 mutex_exit(&l->l_proc->p_smutex); 479 480 return error; 481 } 482 483 int 484 linux_sys_arch_prctl(l, v, retval) 485 struct lwp *l; 486 void *v; 487 register_t *retval; 488 { 489 struct linux_sys_arch_prctl_args /* { 490 syscallarg(int) code; 491 syscallarg(unsigned long) addr; 492 } */ *uap = v; 493 struct pcb *pcb = &l->l_addr->u_pcb; 494 struct trapframe *tf = l->l_md.md_regs; 495 int error; 496 uint64_t taddr; 497 498 switch(SCARG(uap, code)) { 499 case LINUX_ARCH_SET_GS: 500 taddr = SCARG(uap, addr); 501 if (taddr >= VM_MAXUSER_ADDRESS) 502 return EINVAL; 503 pcb->pcb_gs = taddr; 504 pcb->pcb_flags |= PCB_GS64; 505 if (l == curlwp) 506 wrmsr(MSR_KERNELGSBASE, taddr); 507 break; 508 509 case LINUX_ARCH_GET_GS: 510 if (pcb->pcb_flags & PCB_GS64) 511 taddr = pcb->pcb_gs; 512 else { 513 error = memseg_baseaddr(l, tf->tf_fs, NULL, 0, &taddr); 514 if (error != 0) 515 return error; 516 } 517 error = copyout(&taddr, (char *)SCARG(uap, addr), 8); 518 if (error != 0) 519 return error; 520 break; 521 522 case LINUX_ARCH_SET_FS: 523 taddr = SCARG(uap, addr); 524 if (taddr >= VM_MAXUSER_ADDRESS) 525 return EINVAL; 526 pcb->pcb_fs = taddr; 527 pcb->pcb_flags |= PCB_FS64; 528 if (l == curlwp) 529 wrmsr(MSR_FSBASE, taddr); 530 break; 531 532 case LINUX_ARCH_GET_FS: 533 if (pcb->pcb_flags & PCB_FS64) 534 taddr = pcb->pcb_fs; 535 else { 536 error = memseg_baseaddr(l, tf->tf_fs, NULL, 0, &taddr); 537 if (error != 0) 538 return error; 539 } 540 error = copyout(&taddr, (char *)SCARG(uap, addr), 8); 541 if (error != 0) 542 return error; 543 break; 544 545 default: 546 #ifdef DEBUG_LINUX 547 printf("linux_sys_arch_prctl: unexpected code %d\n", 548 SCARG(uap, code)); 549 #endif 550 return EINVAL; 551 } 552 553 return 0; 554 } 555 556 const int linux_vsyscall_to_syscall[] = { 557 LINUX_SYS_gettimeofday, 558 LINUX_SYS_time, 559 LINUX_SYS_nosys, 560 LINUX_SYS_nosys, 561 }; 562 563 int 564 linux_usertrap(struct lwp *l, vaddr_t trapaddr, void *arg) 565 { 566 struct trapframe *tf = arg; 567 uint64_t retaddr; 568 int vsyscallnr; 569 570 /* 571 * Check for a vsyscall. %rip must be the fault address, 572 * and the address must be in the Linux vsyscall area. 573 * Also, vsyscalls are only done at 1024-byte boundaries. 574 */ 575 576 if (__predict_true(trapaddr < LINUX_VSYSCALL_START)) 577 return 0; 578 579 if (trapaddr != tf->tf_rip) 580 return 0; 581 582 if ((tf->tf_rip & (LINUX_VSYSCALL_SIZE - 1)) != 0) 583 return 0; 584 585 vsyscallnr = (tf->tf_rip - LINUX_VSYSCALL_START) / LINUX_VSYSCALL_SIZE; 586 587 if (vsyscallnr > LINUX_VSYSCALL_MAXNR) 588 return 0; 589 590 /* 591 * Get the return address from the top of the stack, 592 * and fix up the return address. 593 * This assumes the faulting instruction was callq *reg, 594 * which is the only way that vsyscalls are ever entered. 595 */ 596 if (copyin((void *)tf->tf_rsp, &retaddr, sizeof retaddr) != 0) 597 return 0; 598 tf->tf_rip = retaddr; 599 tf->tf_rax = linux_vsyscall_to_syscall[vsyscallnr]; 600 tf->tf_rsp += 8; /* "pop" the return address */ 601 602 #if 0 603 printf("usertrap: rip %p rsp %p retaddr %p vsys %d sys %d\n", 604 (void *)tf->tf_rip, (void *)tf->tf_rsp, (void *)retaddr, 605 vsyscallnr, (int)tf->tf_rax); 606 #endif 607 608 (*l->l_proc->p_md.md_syscall)(tf); 609 610 return 1; 611 } 612 613 static void 614 linux_buildcontext(struct lwp *l, void *catcher, void *f) 615 { 616 struct trapframe *tf = l->l_md.md_regs; 617 618 tf->tf_ds = GSEL(GUDATA_SEL, SEL_UPL); 619 tf->tf_rip = (u_int64_t)catcher; 620 tf->tf_cs = GSEL(GUCODE_SEL, SEL_UPL); 621 tf->tf_rflags &= ~(PSL_T|PSL_VM|PSL_AC); 622 tf->tf_rsp = (u_int64_t)f; 623 tf->tf_ss = GSEL(GUDATA_SEL, SEL_UPL); 624 } 625 626 void * 627 linux_get_newtls(l) 628 struct lwp *l; 629 { 630 struct trapframe *tf = l->l_md.md_regs; 631 632 return (void *)tf->tf_r8; 633 } 634 635 int 636 linux_set_newtls(l, tls) 637 struct lwp *l; 638 void *tls; 639 { 640 struct linux_sys_arch_prctl_args cup; 641 register_t retval; 642 643 SCARG(&cup, code) = LINUX_ARCH_SET_FS; 644 SCARG(&cup, addr) = (unsigned long)tls; 645 646 return linux_sys_arch_prctl(l, &cup, &retval); 647 } 648
Indexes created Tue Sep 30 20:09:53 GMT 2025