| 1 | /* |
| 2 | * Copyright (c) 1994, Sean Eric Fagan |
| 3 | * All rights reserved. |
| 4 | * |
| 5 | * Redistribution and use in source and binary forms, with or without |
| 6 | * modification, are permitted provided that the following conditions |
| 7 | * are met: |
| 8 | * 1. Redistributions of source code must retain the above copyright |
| 9 | * notice, this list of conditions and the following disclaimer. |
| 10 | * 2. Redistributions in binary form must reproduce the above copyright |
| 11 | * notice, this list of conditions and the following disclaimer in the |
| 12 | * documentation and/or other materials provided with the distribution. |
| 13 | * 3. All advertising materials mentioning features or use of this software |
| 14 | * must display the following acknowledgement: |
| 15 | * This product includes software developed by Sean Eric Fagan. |
| 16 | * 4. The name of the author may not be used to endorse or promote products |
| 17 | * derived from this software without specific prior written permission. |
| 18 | * |
| 19 | * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND |
| 20 | * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE |
| 21 | * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE |
| 22 | * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE |
| 23 | * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL |
| 24 | * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS |
| 25 | * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) |
| 26 | * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT |
| 27 | * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY |
| 28 | * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF |
| 29 | * SUCH DAMAGE. |
| 30 | * |
| 31 | * $FreeBSD: src/sys/kern/sys_process.c,v 1.51.2.6 2003/01/08 03:06:45 kan Exp $ |
| 32 | */ |
| 33 | |
| 34 | #include <sys/param.h> |
| 35 | #include <sys/systm.h> |
| 36 | #include <sys/sysproto.h> |
| 37 | #include <sys/proc.h> |
| 38 | #include <sys/vnode.h> |
| 39 | #include <sys/ptrace.h> |
| 40 | |
| 41 | #include <machine/reg.h> |
| 42 | #include <vm/vm.h> |
| 43 | #include <sys/lock.h> |
| 44 | #include <vm/pmap.h> |
| 45 | #include <vm/vm_map.h> |
| 46 | #include <vm/vm_page.h> |
| 47 | |
| 48 | #include <sys/user.h> |
| 49 | #include <miscfs/procfs/procfs.h> |
| 50 | |
| 51 | /* use the equivalent procfs code */ |
| 52 | #if 0 |
| 53 | static int |
| 54 | pread (struct proc *procp, unsigned int addr, unsigned int *retval) { |
| 55 | int rv; |
| 56 | vm_map_t map, tmap; |
| 57 | vm_object_t object; |
| 58 | vm_offset_t kva = 0; |
| 59 | int page_offset; /* offset into page */ |
| 60 | vm_offset_t pageno; /* page number */ |
| 61 | vm_map_entry_t out_entry; |
| 62 | vm_prot_t out_prot; |
| 63 | boolean_t wired; |
| 64 | vm_pindex_t pindex; |
| 65 | |
| 66 | /* Map page into kernel space */ |
| 67 | |
| 68 | map = &procp->p_vmspace->vm_map; |
| 69 | |
| 70 | page_offset = addr - trunc_page(addr); |
| 71 | pageno = trunc_page(addr); |
| 72 | |
| 73 | tmap = map; |
| 74 | rv = vm_map_lookup (&tmap, pageno, VM_PROT_READ, &out_entry, |
| 75 | &object, &pindex, &out_prot, &wired); |
| 76 | |
| 77 | if (rv != KERN_SUCCESS) |
| 78 | return EINVAL; |
| 79 | |
| 80 | vm_map_lookup_done (tmap, out_entry); |
| 81 | |
| 82 | /* Find space in kernel_map for the page we're interested in */ |
| 83 | rv = vm_map_find (kernel_map, object, IDX_TO_OFF(pindex), |
| 84 | &kva, PAGE_SIZE, 0, VM_PROT_ALL, VM_PROT_ALL, 0); |
| 85 | |
| 86 | if (!rv) { |
| 87 | vm_object_reference (object); |
| 88 | |
| 89 | rv = vm_map_pageable (kernel_map, kva, kva + PAGE_SIZE, 0); |
| 90 | if (!rv) { |
| 91 | *retval = 0; |
| 92 | bcopy ((caddr_t)kva + page_offset, |
| 93 | retval, sizeof *retval); |
| 94 | } |
| 95 | vm_map_remove (kernel_map, kva, kva + PAGE_SIZE); |
| 96 | } |
| 97 | |
| 98 | return rv; |
| 99 | } |
| 100 | |
| 101 | static int |
| 102 | pwrite (struct proc *procp, unsigned int addr, unsigned int datum) { |
| 103 | int rv; |
| 104 | vm_map_t map, tmap; |
| 105 | vm_object_t object; |
| 106 | vm_offset_t kva = 0; |
| 107 | int page_offset; /* offset into page */ |
| 108 | vm_offset_t pageno; /* page number */ |
| 109 | vm_map_entry_t out_entry; |
| 110 | vm_prot_t out_prot; |
| 111 | boolean_t wired; |
| 112 | vm_pindex_t pindex; |
| 113 | boolean_t fix_prot = 0; |
| 114 | |
| 115 | /* Map page into kernel space */ |
| 116 | |
| 117 | map = &procp->p_vmspace->vm_map; |
| 118 | |
| 119 | page_offset = addr - trunc_page(addr); |
| 120 | pageno = trunc_page(addr); |
| 121 | |
| 122 | /* |
| 123 | * Check the permissions for the area we're interested in. |
| 124 | */ |
| 125 | |
| 126 | if (vm_map_check_protection (map, pageno, pageno + PAGE_SIZE, |
| 127 | VM_PROT_WRITE) == FALSE) { |
| 128 | /* |
| 129 | * If the page was not writable, we make it so. |
| 130 | * XXX It is possible a page may *not* be read/executable, |
| 131 | * if a process changes that! |
| 132 | */ |
| 133 | fix_prot = 1; |
| 134 | /* The page isn't writable, so let's try making it so... */ |
| 135 | if ((rv = vm_map_protect (map, pageno, pageno + PAGE_SIZE, |
| 136 | VM_PROT_ALL, 0)) != KERN_SUCCESS) |
| 137 | return EFAULT; /* I guess... */ |
| 138 | } |
| 139 | |
| 140 | /* |
| 141 | * Now we need to get the page. out_entry, out_prot, wired, and |
| 142 | * single_use aren't used. One would think the vm code would be |
| 143 | * a *bit* nicer... We use tmap because vm_map_lookup() can |
| 144 | * change the map argument. |
| 145 | */ |
| 146 | |
| 147 | tmap = map; |
| 148 | rv = vm_map_lookup (&tmap, pageno, VM_PROT_WRITE, &out_entry, |
| 149 | &object, &pindex, &out_prot, &wired); |
| 150 | if (rv != KERN_SUCCESS) { |
| 151 | return EINVAL; |
| 152 | } |
| 153 | |
| 154 | /* |
| 155 | * Okay, we've got the page. Let's release tmap. |
| 156 | */ |
| 157 | |
| 158 | vm_map_lookup_done (tmap, out_entry); |
| 159 | |
| 160 | /* |
| 161 | * Fault the page in... |
| 162 | */ |
| 163 | |
| 164 | rv = vm_fault(map, pageno, VM_PROT_WRITE|VM_PROT_READ, FALSE); |
| 165 | if (rv != KERN_SUCCESS) |
| 166 | return EFAULT; |
| 167 | |
| 168 | /* Find space in kernel_map for the page we're interested in */ |
| 169 | rv = vm_map_find (kernel_map, object, IDX_TO_OFF(pindex), |
| 170 | &kva, PAGE_SIZE, 0, |
| 171 | VM_PROT_ALL, VM_PROT_ALL, 0); |
| 172 | if (!rv) { |
| 173 | vm_object_reference (object); |
| 174 | |
| 175 | rv = vm_map_pageable (kernel_map, kva, kva + PAGE_SIZE, 0); |
| 176 | if (!rv) { |
| 177 | bcopy (&datum, (caddr_t)kva + page_offset, sizeof datum); |
| 178 | } |
| 179 | vm_map_remove (kernel_map, kva, kva + PAGE_SIZE); |
| 180 | } |
| 181 | |
| 182 | if (fix_prot) |
| 183 | vm_map_protect (map, pageno, pageno + PAGE_SIZE, |
| 184 | VM_PROT_READ|VM_PROT_EXECUTE, 0); |
| 185 | return rv; |
| 186 | } |
| 187 | #endif |
| 188 | |
| 189 | /* |
| 190 | * Process debugging system call. |
| 191 | */ |
| 192 | #ifndef _SYS_SYSPROTO_H_ |
| 193 | struct ptrace_args { |
| 194 | int req; |
| 195 | pid_t pid; |
| 196 | caddr_t addr; |
| 197 | int data; |
| 198 | }; |
| 199 | #endif |
| 200 | |
| 201 | int |
| 202 | ptrace(struct proc *p, struct ptrace_args *uap) |
| 203 | { |
| 204 | /* |
| 205 | * XXX this obfuscation is to reduce stack usage, but the register |
| 206 | * structs may be too large to put on the stack anyway. |
| 207 | */ |
| 208 | union { |
| 209 | struct ptrace_io_desc piod; |
| 210 | struct dbreg dbreg; |
| 211 | struct fpreg fpreg; |
| 212 | struct reg reg; |
| 213 | } r; |
| 214 | void *addr; |
| 215 | int error = 0; |
| 216 | |
| 217 | addr = &r; |
| 218 | switch (uap->req) { |
| 219 | case PT_GETREGS: |
| 220 | case PT_GETFPREGS: |
| 221 | #ifdef PT_GETDBREGS |
| 222 | case PT_GETDBREGS: |
| 223 | #endif |
| 224 | break; |
| 225 | case PT_SETREGS: |
| 226 | error = copyin(uap->addr, &r.reg, sizeof r.reg); |
| 227 | break; |
| 228 | case PT_SETFPREGS: |
| 229 | error = copyin(uap->addr, &r.fpreg, sizeof r.fpreg); |
| 230 | break; |
| 231 | #ifdef PT_SETDBREGS |
| 232 | case PT_SETDBREGS: |
| 233 | error = copyin(uap->addr, &r.dbreg, sizeof r.dbreg); |
| 234 | break; |
| 235 | #endif |
| 236 | case PT_IO: |
| 237 | error = copyin(uap->addr, &r.piod, sizeof r.piod); |
| 238 | break; |
| 239 | default: |
| 240 | addr = uap->addr; |
| 241 | } |
| 242 | if (error) |
| 243 | return (error); |
| 244 | |
| 245 | error = kern_ptrace(p, uap->req, uap->pid, addr, uap->data); |
| 246 | if (error) |
| 247 | return (error); |
| 248 | |
| 249 | switch (uap->req) { |
| 250 | case PT_IO: |
| 251 | (void)copyout(&r.piod, uap->addr, sizeof r.piod); |
| 252 | break; |
| 253 | case PT_GETREGS: |
| 254 | error = copyout(&r.reg, uap->addr, sizeof r.reg); |
| 255 | break; |
| 256 | case PT_GETFPREGS: |
| 257 | error = copyout(&r.fpreg, uap->addr, sizeof r.fpreg); |
| 258 | break; |
| 259 | #ifdef PT_GETDBREGS |
| 260 | case PT_GETDBREGS: |
| 261 | error = copyout(&r.dbreg, uap->addr, sizeof r.dbreg); |
| 262 | break; |
| 263 | #endif |
| 264 | } |
| 265 | |
| 266 | return (error); |
| 267 | } |
| 268 | |
| 269 | int |
| 270 | kern_ptrace(struct proc *curp, int req, pid_t pid, void *addr, int data) |
| 271 | { |
| 272 | struct proc *p, *pp; |
| 273 | struct iovec iov; |
| 274 | struct uio uio; |
| 275 | struct ptrace_io_desc *piod; |
| 276 | int error = 0; |
| 277 | int write, tmp, s; |
| 278 | |
| 279 | write = 0; |
| 280 | if (req == PT_TRACE_ME) |
| 281 | p = curp; |
| 282 | else { |
| 283 | if ((p = pfind(pid)) == NULL) |
| 284 | return ESRCH; |
| 285 | } |
| 286 | if (!PRISON_CHECK(curp, p)) |
| 287 | return (ESRCH); |
| 288 | |
| 289 | /* Can't trace a process that's currently exec'ing. */ |
| 290 | if ((p->p_flag & P_INEXEC) != 0) |
| 291 | return EAGAIN; |
| 292 | |
| 293 | /* |
| 294 | * Permissions check |
| 295 | */ |
| 296 | switch (req) { |
| 297 | case PT_TRACE_ME: |
| 298 | /* Always legal. */ |
| 299 | break; |
| 300 | |
| 301 | case PT_ATTACH: |
| 302 | /* Self */ |
| 303 | if (p->p_pid == curp->p_pid) |
| 304 | return EINVAL; |
| 305 | |
| 306 | /* Already traced */ |
| 307 | if (p->p_flag & P_TRACED) |
| 308 | return EBUSY; |
| 309 | |
| 310 | if (curp->p_flag & P_TRACED) |
| 311 | for (pp = curp->p_pptr; pp != NULL; pp = pp->p_pptr) |
| 312 | if (pp == p) |
| 313 | return (EINVAL); |
| 314 | |
| 315 | /* not owned by you, has done setuid (unless you're root) */ |
| 316 | if ((p->p_cred->p_ruid != curp->p_cred->p_ruid) || |
| 317 | (p->p_flag & P_SUGID)) { |
| 318 | if ((error = suser(curp)) != 0) |
| 319 | return error; |
| 320 | } |
| 321 | |
| 322 | /* can't trace init when securelevel > 0 */ |
| 323 | if (securelevel > 0 && p->p_pid == 1) |
| 324 | return EPERM; |
| 325 | |
| 326 | /* OK */ |
| 327 | break; |
| 328 | |
| 329 | case PT_READ_I: |
| 330 | case PT_READ_D: |
| 331 | case PT_WRITE_I: |
| 332 | case PT_WRITE_D: |
| 333 | case PT_IO: |
| 334 | case PT_CONTINUE: |
| 335 | case PT_KILL: |
| 336 | case PT_STEP: |
| 337 | case PT_DETACH: |
| 338 | #ifdef PT_GETREGS |
| 339 | case PT_GETREGS: |
| 340 | #endif |
| 341 | #ifdef PT_SETREGS |
| 342 | case PT_SETREGS: |
| 343 | #endif |
| 344 | #ifdef PT_GETFPREGS |
| 345 | case PT_GETFPREGS: |
| 346 | #endif |
| 347 | #ifdef PT_SETFPREGS |
| 348 | case PT_SETFPREGS: |
| 349 | #endif |
| 350 | #ifdef PT_GETDBREGS |
| 351 | case PT_GETDBREGS: |
| 352 | #endif |
| 353 | #ifdef PT_SETDBREGS |
| 354 | case PT_SETDBREGS: |
| 355 | #endif |
| 356 | /* not being traced... */ |
| 357 | if ((p->p_flag & P_TRACED) == 0) |
| 358 | return EPERM; |
| 359 | |
| 360 | /* not being traced by YOU */ |
| 361 | if (p->p_pptr != curp) |
| 362 | return EBUSY; |
| 363 | |
| 364 | /* not currently stopped */ |
| 365 | if (p->p_stat != SSTOP || (p->p_flag & P_WAITED) == 0) |
| 366 | return EBUSY; |
| 367 | |
| 368 | /* OK */ |
| 369 | break; |
| 370 | |
| 371 | default: |
| 372 | return EINVAL; |
| 373 | } |
| 374 | |
| 375 | #ifdef FIX_SSTEP |
| 376 | /* |
| 377 | * Single step fixup ala procfs |
| 378 | */ |
| 379 | FIX_SSTEP(p); |
| 380 | #endif |
| 381 | |
| 382 | /* |
| 383 | * Actually do the requests |
| 384 | */ |
| 385 | |
| 386 | curp->p_retval[0] = 0; |
| 387 | |
| 388 | switch (req) { |
| 389 | case PT_TRACE_ME: |
| 390 | /* set my trace flag and "owner" so it can read/write me */ |
| 391 | p->p_flag |= P_TRACED; |
| 392 | p->p_oppid = p->p_pptr->p_pid; |
| 393 | return 0; |
| 394 | |
| 395 | case PT_ATTACH: |
| 396 | /* security check done above */ |
| 397 | p->p_flag |= P_TRACED; |
| 398 | p->p_oppid = p->p_pptr->p_pid; |
| 399 | if (p->p_pptr != curp) |
| 400 | proc_reparent(p, curp); |
| 401 | data = SIGSTOP; |
| 402 | goto sendsig; /* in PT_CONTINUE below */ |
| 403 | |
| 404 | case PT_STEP: |
| 405 | case PT_CONTINUE: |
| 406 | case PT_DETACH: |
| 407 | if ((req != PT_STEP) && ((unsigned)data > _SIG_MAXSIG)) |
| 408 | return EINVAL; |
| 409 | |
| 410 | PHOLD(p); |
| 411 | |
| 412 | if (req == PT_STEP) { |
| 413 | if ((error = ptrace_single_step (p))) { |
| 414 | PRELE(p); |
| 415 | return error; |
| 416 | } |
| 417 | } |
| 418 | |
| 419 | if (addr != (void *)1) { |
| 420 | if ((error = ptrace_set_pc (p, |
| 421 | (u_long)(uintfptr_t)addr))) { |
| 422 | PRELE(p); |
| 423 | return error; |
| 424 | } |
| 425 | } |
| 426 | PRELE(p); |
| 427 | |
| 428 | if (req == PT_DETACH) { |
| 429 | /* reset process parent */ |
| 430 | if (p->p_oppid != p->p_pptr->p_pid) { |
| 431 | struct proc *pp; |
| 432 | |
| 433 | pp = pfind(p->p_oppid); |
| 434 | proc_reparent(p, pp ? pp : initproc); |
| 435 | } |
| 436 | |
| 437 | p->p_flag &= ~(P_TRACED | P_WAITED); |
| 438 | p->p_oppid = 0; |
| 439 | |
| 440 | /* should we send SIGCHLD? */ |
| 441 | } |
| 442 | |
| 443 | sendsig: |
| 444 | /* deliver or queue signal */ |
| 445 | s = splhigh(); |
| 446 | if (p->p_stat == SSTOP) { |
| 447 | p->p_xstat = data; |
| 448 | setrunnable(p); |
| 449 | } else if (data) { |
| 450 | psignal(p, data); |
| 451 | } |
| 452 | splx(s); |
| 453 | return 0; |
| 454 | |
| 455 | case PT_WRITE_I: |
| 456 | case PT_WRITE_D: |
| 457 | write = 1; |
| 458 | /* fallthrough */ |
| 459 | case PT_READ_I: |
| 460 | case PT_READ_D: |
| 461 | tmp = 0; |
| 462 | /* write = 0 set above */ |
| 463 | iov.iov_base = write ? (caddr_t)&data : (caddr_t)&tmp; |
| 464 | iov.iov_len = sizeof(int); |
| 465 | uio.uio_iov = &iov; |
| 466 | uio.uio_iovcnt = 1; |
| 467 | uio.uio_offset = (off_t)(uintptr_t)addr; |
| 468 | uio.uio_resid = sizeof(int); |
| 469 | uio.uio_segflg = UIO_SYSSPACE; |
| 470 | uio.uio_rw = write ? UIO_WRITE : UIO_READ; |
| 471 | uio.uio_procp = p; |
| 472 | error = procfs_domem(curp, p, NULL, &uio); |
| 473 | if (uio.uio_resid != 0) { |
| 474 | /* |
| 475 | * XXX procfs_domem() doesn't currently return ENOSPC, |
| 476 | * so I think write() can bogusly return 0. |
| 477 | * XXX what happens for short writes? We don't want |
| 478 | * to write partial data. |
| 479 | * XXX procfs_domem() returns EPERM for other invalid |
| 480 | * addresses. Convert this to EINVAL. Does this |
| 481 | * clobber returns of EPERM for other reasons? |
| 482 | */ |
| 483 | if (error == 0 || error == ENOSPC || error == EPERM) |
| 484 | error = EINVAL; /* EOF */ |
| 485 | } |
| 486 | if (!write) |
| 487 | curp->p_retval[0] = tmp; |
| 488 | return (error); |
| 489 | |
| 490 | case PT_IO: |
| 491 | piod = addr; |
| 492 | iov.iov_base = piod->piod_addr; |
| 493 | iov.iov_len = piod->piod_len; |
| 494 | uio.uio_iov = &iov; |
| 495 | uio.uio_iovcnt = 1; |
| 496 | uio.uio_offset = (off_t)(uintptr_t)piod->piod_offs; |
| 497 | uio.uio_resid = piod->piod_len; |
| 498 | uio.uio_segflg = UIO_USERSPACE; |
| 499 | uio.uio_procp = p; |
| 500 | switch (piod->piod_op) { |
| 501 | case PIOD_READ_D: |
| 502 | case PIOD_READ_I: |
| 503 | uio.uio_rw = UIO_READ; |
| 504 | break; |
| 505 | case PIOD_WRITE_D: |
| 506 | case PIOD_WRITE_I: |
| 507 | uio.uio_rw = UIO_WRITE; |
| 508 | break; |
| 509 | default: |
| 510 | return (EINVAL); |
| 511 | } |
| 512 | error = procfs_domem(curp, p, NULL, &uio); |
| 513 | piod->piod_len -= uio.uio_resid; |
| 514 | return (error); |
| 515 | |
| 516 | case PT_KILL: |
| 517 | data = SIGKILL; |
| 518 | goto sendsig; /* in PT_CONTINUE above */ |
| 519 | |
| 520 | #ifdef PT_SETREGS |
| 521 | case PT_SETREGS: |
| 522 | write = 1; |
| 523 | /* fallthrough */ |
| 524 | #endif /* PT_SETREGS */ |
| 525 | #ifdef PT_GETREGS |
| 526 | case PT_GETREGS: |
| 527 | /* write = 0 above */ |
| 528 | #endif /* PT_SETREGS */ |
| 529 | #if defined(PT_SETREGS) || defined(PT_GETREGS) |
| 530 | if (!procfs_validregs(p)) /* no P_SYSTEM procs please */ |
| 531 | return EINVAL; |
| 532 | else { |
| 533 | iov.iov_base = addr; |
| 534 | iov.iov_len = sizeof(struct reg); |
| 535 | uio.uio_iov = &iov; |
| 536 | uio.uio_iovcnt = 1; |
| 537 | uio.uio_offset = 0; |
| 538 | uio.uio_resid = sizeof(struct reg); |
| 539 | uio.uio_segflg = UIO_SYSSPACE; |
| 540 | uio.uio_rw = write ? UIO_WRITE : UIO_READ; |
| 541 | uio.uio_procp = curp; |
| 542 | return (procfs_doregs(curp, p, NULL, &uio)); |
| 543 | } |
| 544 | #endif /* defined(PT_SETREGS) || defined(PT_GETREGS) */ |
| 545 | |
| 546 | #ifdef PT_SETFPREGS |
| 547 | case PT_SETFPREGS: |
| 548 | write = 1; |
| 549 | /* fallthrough */ |
| 550 | #endif /* PT_SETFPREGS */ |
| 551 | #ifdef PT_GETFPREGS |
| 552 | case PT_GETFPREGS: |
| 553 | /* write = 0 above */ |
| 554 | #endif /* PT_SETFPREGS */ |
| 555 | #if defined(PT_SETFPREGS) || defined(PT_GETFPREGS) |
| 556 | if (!procfs_validfpregs(p)) /* no P_SYSTEM procs please */ |
| 557 | return EINVAL; |
| 558 | else { |
| 559 | iov.iov_base = addr; |
| 560 | iov.iov_len = sizeof(struct fpreg); |
| 561 | uio.uio_iov = &iov; |
| 562 | uio.uio_iovcnt = 1; |
| 563 | uio.uio_offset = 0; |
| 564 | uio.uio_resid = sizeof(struct fpreg); |
| 565 | uio.uio_segflg = UIO_SYSSPACE; |
| 566 | uio.uio_rw = write ? UIO_WRITE : UIO_READ; |
| 567 | uio.uio_procp = curp; |
| 568 | return (procfs_dofpregs(curp, p, NULL, &uio)); |
| 569 | } |
| 570 | #endif /* defined(PT_SETFPREGS) || defined(PT_GETFPREGS) */ |
| 571 | |
| 572 | #ifdef PT_SETDBREGS |
| 573 | case PT_SETDBREGS: |
| 574 | write = 1; |
| 575 | /* fallthrough */ |
| 576 | #endif /* PT_SETDBREGS */ |
| 577 | #ifdef PT_GETDBREGS |
| 578 | case PT_GETDBREGS: |
| 579 | /* write = 0 above */ |
| 580 | #endif /* PT_SETDBREGS */ |
| 581 | #if defined(PT_SETDBREGS) || defined(PT_GETDBREGS) |
| 582 | if (!procfs_validdbregs(p)) /* no P_SYSTEM procs please */ |
| 583 | return EINVAL; |
| 584 | else { |
| 585 | iov.iov_base = addr; |
| 586 | iov.iov_len = sizeof(struct dbreg); |
| 587 | uio.uio_iov = &iov; |
| 588 | uio.uio_iovcnt = 1; |
| 589 | uio.uio_offset = 0; |
| 590 | uio.uio_resid = sizeof(struct dbreg); |
| 591 | uio.uio_segflg = UIO_SYSSPACE; |
| 592 | uio.uio_rw = write ? UIO_WRITE : UIO_READ; |
| 593 | uio.uio_procp = curp; |
| 594 | return (procfs_dodbregs(curp, p, NULL, &uio)); |
| 595 | } |
| 596 | #endif /* defined(PT_SETDBREGS) || defined(PT_GETDBREGS) */ |
| 597 | |
| 598 | default: |
| 599 | break; |
| 600 | } |
| 601 | |
| 602 | return 0; |
| 603 | } |
| 604 | |
| 605 | int |
| 606 | trace_req(p) |
| 607 | struct proc *p; |
| 608 | { |
| 609 | return 1; |
| 610 | } |
| 611 | |
| 612 | /* |
| 613 | * stopevent() |
| 614 | * Stop a process because of a procfs event; |
| 615 | * stay stopped until p->p_step is cleared |
| 616 | * (cleared by PIOCCONT in procfs). |
| 617 | */ |
| 618 | |
| 619 | void |
| 620 | stopevent(struct proc *p, unsigned int event, unsigned int val) { |
| 621 | p->p_step = 1; |
| 622 | |
| 623 | do { |
| 624 | p->p_xstat = val; |
| 625 | p->p_stype = event; /* Which event caused the stop? */ |
| 626 | wakeup(&p->p_stype); /* Wake up any PIOCWAIT'ing procs */ |
| 627 | tsleep(&p->p_step, PWAIT, "stopevent", 0); |
| 628 | } while (p->p_step); |
| 629 | } |