linux_machdep.c revision 1.6
1 /* $NetBSD: linux_machdep.c,v 1.6 2005/05/22 19:31:15 fvdl 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 1.6 2005/05/22 19:31:15 fvdl 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/ucontext.h> 47 48 #include <machine/reg.h> 49 #include <machine/pcb.h> 50 #include <machine/fpu.h> 51 #include <machine/mcontext.h> 52 #include <machine/specialreg.h> 53 #include <machine/vmparam.h> 54 55 #include <compat/linux/common/linux_signal.h> 56 #include <compat/linux/common/linux_errno.h> 57 #include <compat/linux/common/linux_exec.h> 58 #include <compat/linux/common/linux_ioctl.h> 59 #include <compat/linux/common/linux_prctl.h> 60 #include <compat/linux/common/linux_machdep.h> 61 #include <compat/linux/linux_syscall.h> 62 #include <compat/linux/linux_syscallargs.h> 63 64 static void linux_buildcontext(struct lwp *, void *, void *); 65 66 void 67 linux_setregs(l, epp, stack) 68 struct lwp *l; 69 struct exec_package *epp; 70 u_long stack; 71 { 72 struct pcb *pcb = &l->l_addr->u_pcb; 73 struct trapframe *tf; 74 75 /* If we were using the FPU, forget about it. */ 76 if (l->l_addr->u_pcb.pcb_fpcpu != NULL) 77 fpusave_lwp(l, 0); 78 79 l->l_md.md_flags &= ~MDP_USEDFPU; 80 pcb->pcb_flags = 0; 81 pcb->pcb_savefpu.fp_fxsave.fx_fcw = __NetBSD_NPXCW__; 82 pcb->pcb_savefpu.fp_fxsave.fx_mxcsr = __INITIAL_MXCSR__; 83 pcb->pcb_savefpu.fp_fxsave.fx_mxcsr_mask = __INITIAL_MXCSR_MASK__; 84 pcb->pcb_fs = 0; 85 pcb->pcb_gs = 0; 86 87 l->l_proc->p_flag &= ~P_32; 88 89 tf = l->l_md.md_regs; 90 tf->tf_rax = 0; 91 tf->tf_rbx = 0; 92 tf->tf_rcx = epp->ep_entry; 93 tf->tf_rdx = 0; 94 tf->tf_rsi = 0; 95 tf->tf_rdi = 0; 96 tf->tf_rbp = 0; 97 tf->tf_rsp = stack; 98 tf->tf_r8 = 0; 99 tf->tf_r9 = 0; 100 tf->tf_r10 = 0; 101 tf->tf_r11 = 0; 102 tf->tf_r12 = 0; 103 tf->tf_r13 = 0; 104 tf->tf_r14 = 0; 105 tf->tf_r15 = 0; 106 tf->tf_rip = epp->ep_entry; 107 tf->tf_rflags = PSL_USERSET; 108 tf->tf_cs = GSEL(GUCODE_SEL, SEL_UPL); 109 tf->tf_ss = GSEL(GUDATA_SEL, SEL_UPL); 110 tf->tf_ds = 0; 111 tf->tf_es = 0; 112 tf->tf_fs = 0; 113 tf->tf_gs = 0; 114 115 return; 116 } 117 118 void 119 linux_sendsig(ksi, mask) 120 const ksiginfo_t *ksi; 121 const sigset_t *mask; 122 { 123 struct lwp *l = curlwp; 124 struct proc *p = l->l_proc; 125 struct sigacts *ps = p->p_sigacts; 126 int onstack; 127 int sig = ksi->ksi_signo; 128 struct linux_rt_sigframe *sfp, sigframe; 129 struct linux__fpstate *fpsp, fpstate; 130 struct fpreg fpregs; 131 struct trapframe *tf = l->l_md.md_regs; 132 sig_t catcher = SIGACTION(p, sig).sa_handler; 133 linux_sigset_t lmask; 134 char *sp; 135 int error; 136 137 /* Do we need to jump onto the signal stack? */ 138 onstack = 139 (p->p_sigctx.ps_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)p->p_sigctx.ps_sigstk.ss_sp + 145 p->p_sigctx.ps_sigstk.ss_size); 146 else 147 sp = (caddr_t)tf->tf_rsp - 128; 148 149 150 /* 151 * Save FPU state, if any 152 */ 153 if (l->l_md.md_flags & MDP_USEDFPU) { 154 sp = (char *) 155 (((long)sp - sizeof(struct linux__fpstate)) & ~0xfUL); 156 fpsp = (struct linux__fpstate *)sp; 157 158 (void)process_read_fpregs(l, &fpregs); 159 bzero(&fpstate, sizeof(fpstate)); 160 161 fpstate.cwd = fpregs.fp_fcw; 162 fpstate.swd = fpregs.fp_fsw; 163 fpstate.twd = fpregs.fp_ftw; 164 fpstate.fop = fpregs.fp_fop; 165 fpstate.rip = fpregs.fp_rip; 166 fpstate.rdp = fpregs.fp_rdp; 167 fpstate.mxcsr = fpregs.fp_mxcsr; 168 fpstate.mxcsr_mask = fpregs.fp_mxcsr_mask; 169 memcpy(&fpstate.st_space, &fpregs.fp_st, 170 sizeof(fpstate.st_space)); 171 memcpy(&fpstate.xmm_space, &fpregs.fp_xmm, 172 sizeof(fpstate.xmm_space)); 173 174 if ((error = copyout(&fpstate, fpsp, sizeof(fpstate))) != 0) { 175 sigexit(l, SIGILL); 176 return; 177 } 178 } else { 179 fpsp = NULL; 180 } 181 182 /* 183 * Populate the rt_sigframe 184 */ 185 sp = (char *) 186 ((((long)sp - sizeof(struct linux_rt_sigframe)) & ~0xfUL) - 8); 187 sfp = (struct linux_rt_sigframe *)sp; 188 189 bzero(&sigframe, sizeof(sigframe)); 190 if (ps->sa_sigdesc[sig].sd_vers != 0) 191 sigframe.pretcode = (char *)ps->sa_sigdesc[sig].sd_tramp; 192 else 193 sigframe.pretcode = NULL; 194 195 /* 196 * The user context 197 */ 198 sigframe.uc.luc_flags = 0; 199 sigframe.uc.luc_link = NULL; 200 201 /* This is used regardless of SA_ONSTACK in Linux */ 202 sigframe.uc.luc_stack.ss_sp = p->p_sigctx.ps_sigstk.ss_sp; 203 sigframe.uc.luc_stack.ss_size = p->p_sigctx.ps_sigstk.ss_size; 204 sigframe.uc.luc_stack.ss_flags = 0; 205 if (p->p_sigctx.ps_sigstk.ss_flags & SS_ONSTACK) 206 sigframe.uc.luc_stack.ss_flags |= LINUX_SS_ONSTACK; 207 if (p->p_sigctx.ps_sigstk.ss_flags & SS_DISABLE) 208 sigframe.uc.luc_stack.ss_flags |= LINUX_SS_DISABLE; 209 210 sigframe.uc.luc_mcontext.r8 = tf->tf_r8; 211 sigframe.uc.luc_mcontext.r9 = tf->tf_r9; 212 sigframe.uc.luc_mcontext.r10 = tf->tf_r10; 213 sigframe.uc.luc_mcontext.r11 = tf->tf_r11; 214 sigframe.uc.luc_mcontext.r12 = tf->tf_r12; 215 sigframe.uc.luc_mcontext.r13 = tf->tf_r13; 216 sigframe.uc.luc_mcontext.r14 = tf->tf_r14; 217 sigframe.uc.luc_mcontext.r15 = tf->tf_r15; 218 sigframe.uc.luc_mcontext.rdi = tf->tf_rdi; 219 sigframe.uc.luc_mcontext.rsi = tf->tf_rsi; 220 sigframe.uc.luc_mcontext.rbp = tf->tf_rbp; 221 sigframe.uc.luc_mcontext.rbx = tf->tf_rbx; 222 sigframe.uc.luc_mcontext.rdx = tf->tf_rdx; 223 sigframe.uc.luc_mcontext.rcx = tf->tf_rcx; 224 sigframe.uc.luc_mcontext.rsp = tf->tf_rsp; 225 sigframe.uc.luc_mcontext.rip = tf->tf_rip; 226 sigframe.uc.luc_mcontext.eflags = tf->tf_rflags; 227 sigframe.uc.luc_mcontext.cs = tf->tf_cs; 228 sigframe.uc.luc_mcontext.gs = tf->tf_gs; 229 sigframe.uc.luc_mcontext.fs = tf->tf_fs; 230 sigframe.uc.luc_mcontext.err = tf->tf_err; 231 sigframe.uc.luc_mcontext.trapno = tf->tf_trapno; 232 native_to_linux_sigset(&lmask, mask); 233 sigframe.uc.luc_mcontext.oldmask = lmask.sig[0]; 234 sigframe.uc.luc_mcontext.cr2 = (long)l->l_addr->u_pcb.pcb_onfault; 235 sigframe.uc.luc_mcontext.fpstate = fpsp; 236 native_to_linux_sigset(&sigframe.uc.luc_sigmask, mask); 237 238 /* 239 * the siginfo structure 240 */ 241 sigframe.info.lsi_signo = native_to_linux_signo[sig]; 242 sigframe.info.lsi_errno = native_to_linux_errno[ksi->ksi_errno]; 243 sigframe.info.lsi_code = ksi->ksi_code; 244 245 /* XXX This is a rought conversion, taken from i386 code */ 246 switch (sigframe.info.lsi_signo) { 247 case LINUX_SIGILL: 248 case LINUX_SIGFPE: 249 case LINUX_SIGSEGV: 250 case LINUX_SIGBUS: 251 case LINUX_SIGTRAP: 252 sigframe.info._sifields._sigfault._addr = ksi->ksi_addr; 253 break; 254 case LINUX_SIGCHLD: 255 sigframe.info._sifields._sigchld._pid = ksi->ksi_pid; 256 sigframe.info._sifields._sigchld._uid = ksi->ksi_uid; 257 sigframe.info._sifields._sigchld._status = ksi->ksi_status; 258 sigframe.info._sifields._sigchld._utime = ksi->ksi_utime; 259 sigframe.info._sifields._sigchld._stime = ksi->ksi_stime; 260 break; 261 case LINUX_SIGIO: 262 sigframe.info._sifields._sigpoll._band = ksi->ksi_band; 263 sigframe.info._sifields._sigpoll._fd = ksi->ksi_fd; 264 break; 265 default: 266 sigframe.info._sifields._sigchld._pid = ksi->ksi_pid; 267 sigframe.info._sifields._sigchld._uid = ksi->ksi_uid; 268 if ((sigframe.info.lsi_signo == LINUX_SIGALRM) || 269 (sigframe.info.lsi_signo >= LINUX_SIGRTMIN)) 270 sigframe.info._sifields._timer._sigval.sival_ptr = 271 ksi->ksi_sigval.sival_ptr; 272 break; 273 } 274 275 if ((error = copyout(&sigframe, sp, sizeof(sigframe))) != 0) { 276 sigexit(l, SIGILL); 277 return; 278 } 279 280 linux_buildcontext(l, catcher, sp); 281 tf->tf_rdi = sigframe.info.lsi_signo; 282 tf->tf_rax = 0; 283 tf->tf_rsi = (long)&sfp->info; 284 tf->tf_rdx = (long)&sfp->uc; 285 286 /* 287 * Remember we use signal stack 288 */ 289 if (onstack) 290 p->p_sigctx.ps_sigstk.ss_flags |= SS_ONSTACK; 291 return; 292 } 293 294 int 295 linux_sys_modify_ldt(l, v, retval) 296 struct lwp *l; 297 void *v; 298 register_t *retval; 299 { 300 return 0; 301 } 302 303 int 304 linux_sys_iopl(l, v, retval) 305 struct lwp *l; 306 void *v; 307 register_t *retval; 308 { 309 return 0; 310 } 311 312 int 313 linux_sys_ioperm(l, v, retval) 314 struct lwp *l; 315 void *v; 316 register_t *retval; 317 { 318 return 0; 319 } 320 321 dev_t 322 linux_fakedev(dev, raw) 323 dev_t dev; 324 int raw; 325 { 326 return 0; 327 } 328 329 int 330 linux_machdepioctl(p, v, retval) 331 struct proc *p; 332 void *v; 333 register_t *retval; 334 { 335 return 0; 336 } 337 338 int 339 linux_sys_rt_sigreturn(l, v, retval) 340 struct lwp *l; 341 void *v; 342 register_t *retval; 343 { 344 struct linux_ucontext *luctx; 345 struct trapframe *tf = l->l_md.md_regs; 346 struct linux_sigcontext *lsigctx; 347 struct linux__fpstate fpstate; 348 struct linux_rt_sigframe frame, *fp; 349 ucontext_t uctx; 350 mcontext_t *mctx; 351 struct fxsave64 *fxsave; 352 int error; 353 354 fp = (struct linux_rt_sigframe *)(tf->tf_rsp - 8); 355 if ((error = copyin(fp, &frame, sizeof(frame))) != 0) { 356 sigexit(l, SIGILL); 357 return error; 358 } 359 luctx = &frame.uc; 360 lsigctx = &luctx->luc_mcontext; 361 362 bzero(&uctx, sizeof(uctx)); 363 mctx = (mcontext_t *)&uctx.uc_mcontext; 364 fxsave = (struct fxsave64 *)&mctx->__fpregs; 365 366 /* 367 * Set the flags. Linux always have CPU, stack and signal state, 368 * FPU is optional. uc_flags is not used to tell what we have. 369 */ 370 uctx.uc_flags = (_UC_SIGMASK|_UC_CPU|_UC_STACK|_UC_CLRSTACK); 371 if (lsigctx->fpstate != NULL) 372 uctx.uc_flags |= _UC_FPU; 373 uctx.uc_link = NULL; 374 375 /* 376 * Signal set 377 */ 378 linux_to_native_sigset(&uctx.uc_sigmask, &luctx->luc_sigmask); 379 380 /* 381 * CPU state 382 */ 383 mctx->__gregs[_REG_R8] = lsigctx->r8; 384 mctx->__gregs[_REG_R9] = lsigctx->r9; 385 mctx->__gregs[_REG_R10] = lsigctx->r10; 386 mctx->__gregs[_REG_R11] = lsigctx->r11; 387 mctx->__gregs[_REG_R12] = lsigctx->r12; 388 mctx->__gregs[_REG_R13] = lsigctx->r13; 389 mctx->__gregs[_REG_R14] = lsigctx->r14; 390 mctx->__gregs[_REG_R15] = lsigctx->r15; 391 mctx->__gregs[_REG_RDI] = lsigctx->rdi; 392 mctx->__gregs[_REG_RSI] = lsigctx->rsi; 393 mctx->__gregs[_REG_RBP] = lsigctx->rbp; 394 mctx->__gregs[_REG_RBX] = lsigctx->rbx; 395 mctx->__gregs[_REG_RAX] = tf->tf_rax; 396 mctx->__gregs[_REG_RDX] = lsigctx->rdx; 397 mctx->__gregs[_REG_RCX] = lsigctx->rcx; 398 mctx->__gregs[_REG_RIP] = lsigctx->rip; 399 mctx->__gregs[_REG_RFL] = lsigctx->eflags; 400 mctx->__gregs[_REG_CS] = lsigctx->cs; 401 mctx->__gregs[_REG_GS] = lsigctx->gs; 402 mctx->__gregs[_REG_FS] = lsigctx->fs; 403 mctx->__gregs[_REG_ERR] = lsigctx->err; 404 mctx->__gregs[_REG_TRAPNO] = lsigctx->trapno; 405 mctx->__gregs[_REG_ES] = tf->tf_es; 406 mctx->__gregs[_REG_DS] = tf->tf_ds; 407 mctx->__gregs[_REG_URSP] = lsigctx->rsp; /* XXX */ 408 mctx->__gregs[_REG_SS] = tf->tf_ss; 409 410 /* 411 * FPU state 412 */ 413 if (lsigctx->fpstate != NULL) { 414 error = copyin(lsigctx->fpstate, &fpstate, sizeof(fpstate)); 415 if (error != 0) { 416 sigexit(l, SIGILL); 417 return error; 418 } 419 420 fxsave->fx_fcw = fpstate.cwd; 421 fxsave->fx_fsw = fpstate.swd; 422 fxsave->fx_ftw = fpstate.twd; 423 fxsave->fx_fop = fpstate.fop; 424 fxsave->fx_rip = fpstate.rip; 425 fxsave->fx_rdp = fpstate.rdp; 426 fxsave->fx_mxcsr = fpstate.mxcsr; 427 fxsave->fx_mxcsr_mask = fpstate.mxcsr_mask; 428 memcpy(&fxsave->fx_st, &fpstate.st_space, 429 sizeof(fxsave->fx_st)); 430 memcpy(&fxsave->fx_xmm, &fpstate.xmm_space, 431 sizeof(fxsave->fx_xmm)); 432 } 433 434 /* 435 * And the stack 436 */ 437 uctx.uc_stack.ss_flags = 0; 438 if (luctx->luc_stack.ss_flags & LINUX_SS_ONSTACK); 439 uctx.uc_stack.ss_flags = SS_ONSTACK; 440 441 if (luctx->luc_stack.ss_flags & LINUX_SS_DISABLE); 442 uctx.uc_stack.ss_flags = SS_DISABLE; 443 444 uctx.uc_stack.ss_sp = luctx->luc_stack.ss_sp; 445 uctx.uc_stack.ss_size = luctx->luc_stack.ss_size; 446 447 /* 448 * And let setucontext deal with that. 449 */ 450 return setucontext(l, &uctx); 451 } 452 453 int 454 linux_sys_arch_prctl(l, v, retval) 455 struct lwp *l; 456 void *v; 457 register_t *retval; 458 { 459 struct linux_sys_arch_prctl_args /* { 460 syscallarg(int) code; 461 syscallarg(unsigned long) addr; 462 } */ *uap = v; 463 struct pcb *pcb = &l->l_addr->u_pcb; 464 struct trapframe *tf = l->l_md.md_regs; 465 int error; 466 uint64_t taddr; 467 468 switch(SCARG(uap, code)) { 469 case LINUX_ARCH_SET_GS: 470 taddr = SCARG(uap, addr); 471 if (taddr >= VM_MAXUSER_ADDRESS) 472 return EINVAL; 473 pcb->pcb_gs = taddr; 474 pcb->pcb_flags |= PCB_GS64; 475 if (l == curlwp) 476 wrmsr(MSR_KERNELGSBASE, taddr); 477 break; 478 479 case LINUX_ARCH_GET_GS: 480 if (pcb->pcb_flags & PCB_GS64) 481 taddr = pcb->pcb_gs; 482 else { 483 error = memseg_baseaddr(l, tf->tf_fs, NULL, 0, &taddr); 484 if (error != 0) 485 return error; 486 } 487 error = copyout(&taddr, (char *)SCARG(uap, addr), 8); 488 if (error != 0) 489 return error; 490 break; 491 492 case LINUX_ARCH_SET_FS: 493 taddr = SCARG(uap, addr); 494 if (taddr >= VM_MAXUSER_ADDRESS) 495 return EINVAL; 496 pcb->pcb_fs = taddr; 497 pcb->pcb_flags |= PCB_FS64; 498 if (l == curlwp) 499 wrmsr(MSR_FSBASE, taddr); 500 break; 501 502 case LINUX_ARCH_GET_FS: 503 if (pcb->pcb_flags & PCB_FS64) 504 taddr = pcb->pcb_fs; 505 else { 506 error = memseg_baseaddr(l, tf->tf_fs, NULL, 0, &taddr); 507 if (error != 0) 508 return error; 509 } 510 error = copyout(&taddr, (char *)SCARG(uap, addr), 8); 511 if (error != 0) 512 return error; 513 break; 514 515 default: 516 #ifdef DEBUG_LINUX 517 printf("linux_sys_arch_prctl: unexpected code %d\n", 518 SCARG(uap, code)); 519 #endif 520 return EINVAL; 521 } 522 523 return 0; 524 } 525 526 const int linux_vsyscall_to_syscall[] = { 527 LINUX_SYS_gettimeofday, 528 LINUX_SYS_time, 529 LINUX_SYS_nosys, 530 LINUX_SYS_nosys, 531 }; 532 533 int 534 linux_usertrap(struct lwp *l, vaddr_t trapaddr, void *arg) 535 { 536 struct trapframe *tf = arg; 537 uint64_t retaddr; 538 int vsyscallnr; 539 540 /* 541 * Check for a vsyscall. %rip must be the fault address, 542 * and the address must be in the Linux vsyscall area. 543 * Also, vsyscalls are only done at 1024-byte boundaries. 544 */ 545 546 if (__predict_true(trapaddr < LINUX_VSYSCALL_START)) 547 return 0; 548 549 if (trapaddr != tf->tf_rip) 550 return 0; 551 552 if ((tf->tf_rip & (LINUX_VSYSCALL_SIZE - 1)) != 0) 553 return 0; 554 555 vsyscallnr = (tf->tf_rip - LINUX_VSYSCALL_START) / LINUX_VSYSCALL_SIZE; 556 557 if (vsyscallnr > LINUX_VSYSCALL_MAXNR) 558 return 0; 559 560 /* 561 * Get the return address from the top of the stack, 562 * and fix up the return address. 563 * This assumes the faulting instruction was callq *reg, 564 * which is the only way that vsyscalls are ever entered. 565 */ 566 if (copyin((void *)tf->tf_rsp, &retaddr, sizeof retaddr) != 0) 567 return 0; 568 tf->tf_rip = retaddr; 569 tf->tf_rax = linux_vsyscall_to_syscall[vsyscallnr]; 570 tf->tf_rsp += 8; /* "pop" the return address */ 571 572 #if 0 573 printf("usertrap: rip %p rsp %p retaddr %p vsys %d sys %d\n", 574 (void *)tf->tf_rip, (void *)tf->tf_rsp, (void *)retaddr, 575 vsyscallnr, (int)tf->tf_rax); 576 #endif 577 578 (*l->l_proc->p_md.md_syscall)(tf); 579 580 return 1; 581 } 582 583 static void 584 linux_buildcontext(struct lwp *l, void *catcher, void *f) 585 { 586 struct trapframe *tf = l->l_md.md_regs; 587 588 tf->tf_ds = GSEL(GUDATA_SEL, SEL_UPL); 589 tf->tf_rip = (u_int64_t)catcher; 590 tf->tf_cs = GSEL(GUCODE_SEL, SEL_UPL); 591 tf->tf_rflags &= ~(PSL_T|PSL_VM|PSL_AC); 592 tf->tf_rsp = (u_int64_t)f; 593 tf->tf_ss = GSEL(GUDATA_SEL, SEL_UPL); 594 } 595
Indexes created Tue Sep 30 20:09:53 GMT 2025