Now available: The Design and Implementation of the FreeBSD Operating System (Second Edition)
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FreeBSD/Linux Kernel Cross Reference
sys/emulation/linux/i386/linux_ptrace.c
Version:
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1 /* 2 * Copyright (c) 2001 Alexander Kabaev 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 * in this position and unchanged. 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. The name of the author may not be used to endorse or promote products 15 * derived from this software without specific prior written permission. 16 * 17 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR 18 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 19 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 20 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, 21 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT 22 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 23 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 24 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 25 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF 26 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 27 * 28 * $FreeBSD: src/sys/i386/linux/linux_ptrace.c,v 1.7.4.3 2003/01/03 17:13:23 kan Exp $ 29 * $DragonFly: src/sys/emulation/linux/i386/linux_ptrace.c,v 1.15 2007/02/19 01:14:23 corecode Exp $ 30 */ 31 32 #include "opt_cpu.h" 33 34 #include <sys/param.h> 35 #include <sys/lock.h> 36 #include <sys/proc.h> 37 #include <sys/ptrace.h> 38 #include <sys/systm.h> 39 40 #include <vm/vm.h> 41 #include <vm/pmap.h> 42 #include <vm/vm_map.h> 43 #include <sys/user.h> 44 #include <sys/reg.h> 45 46 #include <machine/md_var.h> 47 #include <machine/pcb.h> 48 49 #include "linux.h" 50 #include "linux_proto.h" 51 52 /* 53 * Linux ptrace requests numbers. Mostly identical to FreeBSD, 54 * except for MD ones and PT_ATTACH/PT_DETACH. 55 */ 56 #define PTRACE_TRACEME 0 57 #define PTRACE_PEEKTEXT 1 58 #define PTRACE_PEEKDATA 2 59 #define PTRACE_PEEKUSR 3 60 #define PTRACE_POKETEXT 4 61 #define PTRACE_POKEDATA 5 62 #define PTRACE_POKEUSR 6 63 #define PTRACE_CONT 7 64 #define PTRACE_KILL 8 65 #define PTRACE_SINGLESTEP 9 66 67 #define PTRACE_ATTACH 16 68 #define PTRACE_DETACH 17 69 70 #define PTRACE_SYSCALL 24 71 72 #define PTRACE_GETREGS 12 73 #define PTRACE_SETREGS 13 74 #define PTRACE_GETFPREGS 14 75 #define PTRACE_SETFPREGS 15 76 #define PTRACE_GETFPXREGS 18 77 #define PTRACE_SETFPXREGS 19 78 79 #define PTRACE_SETOPTIONS 21 80 81 /* 82 * Linux keeps debug registers at the following 83 * offset in the user struct 84 */ 85 #define LINUX_DBREG_OFFSET 252 86 #define LINUX_DBREG_SIZE (8*sizeof(l_int)) 87 88 static __inline__ int 89 map_signum(int signum) 90 { 91 92 if (signum > 0 && signum <= LINUX_SIGTBLSZ) 93 signum = linux_to_bsd_signal[_SIG_IDX(signum)]; 94 return ((signum == SIGSTOP)? 0 : signum); 95 } 96 97 struct linux_pt_reg { 98 l_long ebx; 99 l_long ecx; 100 l_long edx; 101 l_long esi; 102 l_long edi; 103 l_long ebp; 104 l_long eax; 105 l_int xds; 106 l_int xes; 107 l_int xfs; 108 l_int xgs; 109 l_long orig_eax; 110 l_long eip; 111 l_int xcs; 112 l_long eflags; 113 l_long esp; 114 l_int xss; 115 }; 116 117 /* 118 * Translate i386 ptrace registers between Linux and FreeBSD formats. 119 * The translation is pretty straighforward, for all registers, but 120 * orig_eax on Linux side and r_trapno and r_err in FreeBSD 121 */ 122 static void 123 map_regs_to_linux(struct reg *bsd_r, struct linux_pt_reg *linux_r) 124 { 125 linux_r->ebx = bsd_r->r_ebx; 126 linux_r->ecx = bsd_r->r_ecx; 127 linux_r->edx = bsd_r->r_edx; 128 linux_r->esi = bsd_r->r_esi; 129 linux_r->edi = bsd_r->r_edi; 130 linux_r->ebp = bsd_r->r_ebp; 131 linux_r->eax = bsd_r->r_eax; 132 linux_r->xds = bsd_r->r_ds; 133 linux_r->xes = bsd_r->r_es; 134 linux_r->xfs = bsd_r->r_fs; 135 linux_r->xgs = bsd_r->r_gs; 136 linux_r->orig_eax = bsd_r->r_eax; 137 linux_r->eip = bsd_r->r_eip; 138 linux_r->xcs = bsd_r->r_cs; 139 linux_r->eflags = bsd_r->r_eflags; 140 linux_r->esp = bsd_r->r_esp; 141 linux_r->xss = bsd_r->r_ss; 142 } 143 144 static void 145 map_regs_from_linux(struct reg *bsd_r, struct linux_pt_reg *linux_r) 146 { 147 bsd_r->r_ebx = linux_r->ebx; 148 bsd_r->r_ecx = linux_r->ecx; 149 bsd_r->r_edx = linux_r->edx; 150 bsd_r->r_esi = linux_r->esi; 151 bsd_r->r_edi = linux_r->edi; 152 bsd_r->r_ebp = linux_r->ebp; 153 bsd_r->r_eax = linux_r->eax; 154 bsd_r->r_ds = linux_r->xds; 155 bsd_r->r_es = linux_r->xes; 156 bsd_r->r_fs = linux_r->xfs; 157 bsd_r->r_gs = linux_r->xgs; 158 bsd_r->r_eip = linux_r->eip; 159 bsd_r->r_cs = linux_r->xcs; 160 bsd_r->r_eflags = linux_r->eflags; 161 bsd_r->r_esp = linux_r->esp; 162 bsd_r->r_ss = linux_r->xss; 163 } 164 165 struct linux_pt_fpreg { 166 l_long cwd; 167 l_long swd; 168 l_long twd; 169 l_long fip; 170 l_long fcs; 171 l_long foo; 172 l_long fos; 173 l_long st_space[2*10]; 174 }; 175 176 static void 177 map_fpregs_to_linux(struct fpreg *bsd_r, struct linux_pt_fpreg *linux_r) 178 { 179 linux_r->cwd = bsd_r->fpr_env[0]; 180 linux_r->swd = bsd_r->fpr_env[1]; 181 linux_r->twd = bsd_r->fpr_env[2]; 182 linux_r->fip = bsd_r->fpr_env[3]; 183 linux_r->fcs = bsd_r->fpr_env[4]; 184 linux_r->foo = bsd_r->fpr_env[5]; 185 linux_r->fos = bsd_r->fpr_env[6]; 186 bcopy(bsd_r->fpr_acc, linux_r->st_space, sizeof(linux_r->st_space)); 187 } 188 189 static void 190 map_fpregs_from_linux(struct fpreg *bsd_r, struct linux_pt_fpreg *linux_r) 191 { 192 bsd_r->fpr_env[0] = linux_r->cwd; 193 bsd_r->fpr_env[1] = linux_r->swd; 194 bsd_r->fpr_env[2] = linux_r->twd; 195 bsd_r->fpr_env[3] = linux_r->fip; 196 bsd_r->fpr_env[4] = linux_r->fcs; 197 bsd_r->fpr_env[5] = linux_r->foo; 198 bsd_r->fpr_env[6] = linux_r->fos; 199 bcopy(bsd_r->fpr_acc, linux_r->st_space, sizeof(bsd_r->fpr_acc)); 200 } 201 202 struct linux_pt_fpxreg { 203 l_ushort cwd; 204 l_ushort swd; 205 l_ushort twd; 206 l_ushort fop; 207 l_long fip; 208 l_long fcs; 209 l_long foo; 210 l_long fos; 211 l_long mxcsr; 212 l_long reserved; 213 l_long st_space[32]; 214 l_long xmm_space[32]; 215 l_long padding[56]; 216 }; 217 218 #ifndef CPU_DISABLE_SSE 219 static int 220 linux_proc_read_fpxregs(struct lwp *lp, struct linux_pt_fpxreg *fpxregs) 221 { 222 int error; 223 224 error = 0; 225 if (cpu_fxsr == 0) 226 error = EIO; 227 else 228 bcopy(&lp->lwp_thread->td_pcb->pcb_save.sv_xmm, 229 fpxregs, sizeof(*fpxregs)); 230 return (error); 231 } 232 233 static int 234 linux_proc_write_fpxregs(struct lwp *lp, struct linux_pt_fpxreg *fpxregs) 235 { 236 int error; 237 238 error = 0; 239 if (cpu_fxsr == 0) 240 error = EIO; 241 else 242 bcopy(fpxregs, &lp->lwp_thread->td_pcb->pcb_save.sv_xmm, 243 sizeof(*fpxregs)); 244 return (error); 245 } 246 #endif 247 248 /* 249 * MPALMOSTSAFE 250 */ 251 int 252 sys_linux_ptrace(struct linux_ptrace_args *uap) 253 { 254 struct thread *td = curthread; 255 struct proc *curp = td->td_proc; 256 union { 257 struct linux_pt_reg reg; 258 struct linux_pt_fpreg fpreg; 259 struct linux_pt_fpxreg fpxreg; 260 } r; 261 union { 262 struct reg bsd_reg; 263 struct fpreg bsd_fpreg; 264 struct dbreg bsd_dbreg; 265 } u; 266 void *addr; 267 pid_t pid; 268 int error, req; 269 struct proc *p = NULL; /* held process */ 270 271 error = 0; 272 273 /* by default, just copy data intact */ 274 req = uap->req; 275 pid = (pid_t)uap->pid; 276 addr = (void *)uap->addr; 277 278 switch (req) { 279 case PTRACE_TRACEME: 280 case PTRACE_POKETEXT: 281 case PTRACE_POKEDATA: 282 case PTRACE_KILL: 283 error = kern_ptrace(curp, req, pid, addr, uap->data, 284 &uap->sysmsg_iresult); 285 break; 286 case PTRACE_PEEKTEXT: 287 case PTRACE_PEEKDATA: { 288 /* need to preserve return value, use dummy */ 289 l_int rval = 0; 290 error = kern_ptrace(curp, req, pid, addr, 0, &rval); 291 if (error == 0) { 292 error = copyout(&rval, (caddr_t)uap->data, sizeof(l_int)); 293 } 294 break; 295 } 296 case PTRACE_DETACH: 297 error = kern_ptrace(curp, PT_DETACH, pid, (void *)1, 298 map_signum(uap->data), 299 &uap->sysmsg_iresult); 300 break; 301 case PTRACE_SINGLESTEP: 302 case PTRACE_CONT: 303 error = kern_ptrace(curp, req, pid, (void *)1, 304 map_signum(uap->data), 305 &uap->sysmsg_iresult); 306 break; 307 case PTRACE_ATTACH: 308 error = kern_ptrace(curp, PT_ATTACH, pid, addr, uap->data, 309 &uap->sysmsg_iresult); 310 break; 311 case PTRACE_GETREGS: 312 /* Linux is using data where FreeBSD is using addr */ 313 error = kern_ptrace(curp, PT_GETREGS, pid, &u.bsd_reg, 0, 314 &uap->sysmsg_iresult); 315 if (error == 0) { 316 map_regs_to_linux(&u.bsd_reg, &r.reg); 317 error = copyout(&r.reg, (void *)uap->data, 318 sizeof(r.reg)); 319 } 320 break; 321 case PTRACE_SETREGS: 322 /* Linux is using data where FreeBSD is using addr */ 323 error = copyin((caddr_t)uap->data, &r.reg, sizeof(r.reg)); 324 if (error == 0) { 325 map_regs_from_linux(&u.bsd_reg, &r.reg); 326 error = kern_ptrace(curp, PT_SETREGS, pid, &u.bsd_reg, 327 0, &uap->sysmsg_iresult); 328 } 329 break; 330 case PTRACE_GETFPREGS: 331 /* Linux is using data where FreeBSD is using addr */ 332 error = kern_ptrace(curp, PT_GETFPREGS, pid, &u.bsd_fpreg, 333 0, &uap->sysmsg_iresult); 334 if (error == 0) { 335 map_fpregs_to_linux(&u.bsd_fpreg, &r.fpreg); 336 error = copyout(&r.fpreg, (caddr_t)uap->data, 337 sizeof(r.fpreg)); 338 } 339 break; 340 case PTRACE_SETFPREGS: 341 /* Linux is using data where FreeBSD is using addr */ 342 error = copyin((caddr_t)uap->data, &r.fpreg, sizeof(r.fpreg)); 343 if (error == 0) { 344 map_fpregs_from_linux(&u.bsd_fpreg, &r.fpreg); 345 error = kern_ptrace(curp, PT_SETFPREGS, pid, 346 &u.bsd_fpreg, 347 0, &uap->sysmsg_iresult); 348 } 349 break; 350 case PTRACE_SETFPXREGS: 351 #ifndef CPU_DISABLE_SSE 352 error = copyin((caddr_t)uap->data, &r.fpxreg, 353 sizeof(r.fpxreg)); 354 if (error) 355 break; 356 #endif 357 /* FALL THROUGH */ 358 case PTRACE_GETFPXREGS: { 359 #ifndef CPU_DISABLE_SSE 360 struct proc *p; 361 struct lwp *lp; 362 363 if (sizeof(struct linux_pt_fpxreg) != sizeof(struct savexmm)) { 364 static int once = 0; 365 if (!once) { 366 kprintf("linux: savexmm != linux_pt_fpxreg\n"); 367 once = 1; 368 } 369 error = EIO; 370 break; 371 } 372 373 if ((p = pfind(uap->pid)) == NULL) { 374 error = ESRCH; 375 break; 376 } 377 378 if (!PRISON_CHECK(curp->p_ucred, p->p_ucred)) { 379 error = ESRCH; 380 goto fail; 381 } 382 383 /* System processes can't be debugged. */ 384 if ((p->p_flags & P_SYSTEM) != 0) { 385 error = EINVAL; 386 goto fail; 387 } 388 389 /* not being traced... */ 390 if ((p->p_flags & P_TRACED) == 0) { 391 error = EPERM; 392 goto fail; 393 } 394 395 /* not being traced by YOU */ 396 if (p->p_pptr != curp) { 397 error = EBUSY; 398 goto fail; 399 } 400 401 /* not currently stopped */ 402 if ((p->p_flags & (P_TRACED|P_WAITED)) == 0) { 403 error = EBUSY; 404 goto fail; 405 } 406 407 /* XXX lwp */ 408 lp = FIRST_LWP_IN_PROC(p); 409 410 if (req == PTRACE_GETFPXREGS) { 411 LWPHOLD(lp); 412 error = linux_proc_read_fpxregs(lp, &r.fpxreg); 413 LWPRELE(lp); 414 if (error == 0) 415 error = copyout(&r.fpxreg, (caddr_t)uap->data, 416 sizeof(r.fpxreg)); 417 } else { 418 /* clear dangerous bits exactly as Linux does*/ 419 r.fpxreg.mxcsr &= 0xffbf; 420 LWPHOLD(lp); 421 error = linux_proc_write_fpxregs(lp, &r.fpxreg); 422 LWPRELE(lp); 423 } 424 break; 425 426 fail: 427 #else 428 error = EIO; 429 #endif 430 break; 431 } 432 case PTRACE_PEEKUSR: 433 case PTRACE_POKEUSR: { 434 error = EIO; 435 436 /* check addr for alignment */ 437 if (uap->addr < 0 || uap->addr & (sizeof(l_int) - 1)) 438 break; 439 /* 440 * Allow linux programs to access register values in 441 * user struct. We simulate this through PT_GET/SETREGS 442 * as necessary. 443 */ 444 if (uap->addr < sizeof(struct linux_pt_reg)) { 445 error = kern_ptrace(curp, PT_GETREGS, pid, &u.bsd_reg, 446 0, &uap->sysmsg_iresult); 447 if (error != 0) 448 break; 449 450 map_regs_to_linux(&u.bsd_reg, &r.reg); 451 if (req == PTRACE_PEEKUSR) { 452 error = copyout((char *)&r.reg + uap->addr, 453 (caddr_t)uap->data, sizeof(l_int)); 454 break; 455 } 456 457 *(l_int *)((char *)&r.reg + uap->addr) = 458 (l_int)uap->data; 459 460 map_regs_from_linux(&u.bsd_reg, &r.reg); 461 error = kern_ptrace(curp, PT_SETREGS, pid, &u.bsd_reg, 462 0, &uap->sysmsg_iresult); 463 } 464 465 /* 466 * Simulate debug registers access 467 */ 468 if (uap->addr >= LINUX_DBREG_OFFSET && 469 uap->addr <= LINUX_DBREG_OFFSET + LINUX_DBREG_SIZE) { 470 error = kern_ptrace(curp, PT_GETDBREGS, pid, 471 &u.bsd_dbreg, 472 0, &uap->sysmsg_iresult); 473 if (error != 0) 474 break; 475 476 uap->addr -= LINUX_DBREG_OFFSET; 477 if (req == PTRACE_PEEKUSR) { 478 error = copyout((char *)&u.bsd_dbreg + 479 uap->addr, (caddr_t)uap->data, 480 sizeof(l_int)); 481 break; 482 } 483 484 *(l_int *)((char *)&u.bsd_dbreg + uap->addr) = 485 uap->data; 486 error = kern_ptrace(curp, PT_SETDBREGS, pid, 487 &u.bsd_dbreg, 488 0, &uap->sysmsg_iresult); 489 } 490 491 break; 492 } 493 case PTRACE_SYSCALL: 494 /* fall through */ 495 default: 496 kprintf("linux: ptrace(%u, ...) not implemented\n", 497 (unsigned int)uap->req); 498 error = EINVAL; 499 break; 500 } 501 502 /* 503 * Release held proces (if any) before returning. 504 */ 505 if (p) 506 PRELE(p); 507 return (error); 508 }
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