Now available: The Design and Implementation of the FreeBSD Operating System (Second Edition)
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FreeBSD/Linux Kernel Cross Reference
sys/i386/linux/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 29 #include <sys/cdefs.h> 30 __FBSDID("$FreeBSD: releng/10.2/sys/i386/linux/linux_ptrace.c 276084 2014-12-22 21:32:39Z jhb $"); 31 32 #include "opt_cpu.h" 33 34 #include <sys/param.h> 35 #include <sys/lock.h> 36 #include <sys/mutex.h> 37 #include <sys/proc.h> 38 #include <sys/ptrace.h> 39 #include <sys/syscallsubr.h> 40 #include <sys/systm.h> 41 42 #include <machine/md_var.h> 43 #include <machine/pcb.h> 44 #include <machine/reg.h> 45 46 #include <i386/linux/linux.h> 47 #include <i386/linux/linux_proto.h> 48 #include <compat/linux/linux_signal.h> 49 50 #if !defined(CPU_DISABLE_SSE) && defined(I686_CPU) 51 #define CPU_ENABLE_SSE 52 #endif 53 54 /* 55 * Linux ptrace requests numbers. Mostly identical to FreeBSD, 56 * except for MD ones and PT_ATTACH/PT_DETACH. 57 */ 58 #define PTRACE_TRACEME 0 59 #define PTRACE_PEEKTEXT 1 60 #define PTRACE_PEEKDATA 2 61 #define PTRACE_PEEKUSR 3 62 #define PTRACE_POKETEXT 4 63 #define PTRACE_POKEDATA 5 64 #define PTRACE_POKEUSR 6 65 #define PTRACE_CONT 7 66 #define PTRACE_KILL 8 67 #define PTRACE_SINGLESTEP 9 68 69 #define PTRACE_ATTACH 16 70 #define PTRACE_DETACH 17 71 72 #define PTRACE_SYSCALL 24 73 74 #define PTRACE_GETREGS 12 75 #define PTRACE_SETREGS 13 76 #define PTRACE_GETFPREGS 14 77 #define PTRACE_SETFPREGS 15 78 #define PTRACE_GETFPXREGS 18 79 #define PTRACE_SETFPXREGS 19 80 81 #define PTRACE_SETOPTIONS 21 82 83 /* 84 * Linux keeps debug registers at the following 85 * offset in the user struct 86 */ 87 #define LINUX_DBREG_OFFSET 252 88 #define LINUX_DBREG_SIZE (8*sizeof(l_int)) 89 90 static __inline int 91 map_signum(int signum) 92 { 93 94 if (signum > 0 && signum <= LINUX_SIGTBLSZ) 95 signum = linux_to_bsd_signal[_SIG_IDX(signum)]; 96 return ((signum == SIGSTOP)? 0 : signum); 97 } 98 99 struct linux_pt_reg { 100 l_long ebx; 101 l_long ecx; 102 l_long edx; 103 l_long esi; 104 l_long edi; 105 l_long ebp; 106 l_long eax; 107 l_int xds; 108 l_int xes; 109 l_int xfs; 110 l_int xgs; 111 l_long orig_eax; 112 l_long eip; 113 l_int xcs; 114 l_long eflags; 115 l_long esp; 116 l_int xss; 117 }; 118 119 /* 120 * Translate i386 ptrace registers between Linux and FreeBSD formats. 121 * The translation is pretty straighforward, for all registers, but 122 * orig_eax on Linux side and r_trapno and r_err in FreeBSD 123 */ 124 static void 125 map_regs_to_linux(struct reg *bsd_r, struct linux_pt_reg *linux_r) 126 { 127 linux_r->ebx = bsd_r->r_ebx; 128 linux_r->ecx = bsd_r->r_ecx; 129 linux_r->edx = bsd_r->r_edx; 130 linux_r->esi = bsd_r->r_esi; 131 linux_r->edi = bsd_r->r_edi; 132 linux_r->ebp = bsd_r->r_ebp; 133 linux_r->eax = bsd_r->r_eax; 134 linux_r->xds = bsd_r->r_ds; 135 linux_r->xes = bsd_r->r_es; 136 linux_r->xfs = bsd_r->r_fs; 137 linux_r->xgs = bsd_r->r_gs; 138 linux_r->orig_eax = bsd_r->r_eax; 139 linux_r->eip = bsd_r->r_eip; 140 linux_r->xcs = bsd_r->r_cs; 141 linux_r->eflags = bsd_r->r_eflags; 142 linux_r->esp = bsd_r->r_esp; 143 linux_r->xss = bsd_r->r_ss; 144 } 145 146 static void 147 map_regs_from_linux(struct reg *bsd_r, struct linux_pt_reg *linux_r) 148 { 149 bsd_r->r_ebx = linux_r->ebx; 150 bsd_r->r_ecx = linux_r->ecx; 151 bsd_r->r_edx = linux_r->edx; 152 bsd_r->r_esi = linux_r->esi; 153 bsd_r->r_edi = linux_r->edi; 154 bsd_r->r_ebp = linux_r->ebp; 155 bsd_r->r_eax = linux_r->eax; 156 bsd_r->r_ds = linux_r->xds; 157 bsd_r->r_es = linux_r->xes; 158 bsd_r->r_fs = linux_r->xfs; 159 bsd_r->r_gs = linux_r->xgs; 160 bsd_r->r_eip = linux_r->eip; 161 bsd_r->r_cs = linux_r->xcs; 162 bsd_r->r_eflags = linux_r->eflags; 163 bsd_r->r_esp = linux_r->esp; 164 bsd_r->r_ss = linux_r->xss; 165 } 166 167 struct linux_pt_fpreg { 168 l_long cwd; 169 l_long swd; 170 l_long twd; 171 l_long fip; 172 l_long fcs; 173 l_long foo; 174 l_long fos; 175 l_long st_space[2*10]; 176 }; 177 178 static void 179 map_fpregs_to_linux(struct fpreg *bsd_r, struct linux_pt_fpreg *linux_r) 180 { 181 linux_r->cwd = bsd_r->fpr_env[0]; 182 linux_r->swd = bsd_r->fpr_env[1]; 183 linux_r->twd = bsd_r->fpr_env[2]; 184 linux_r->fip = bsd_r->fpr_env[3]; 185 linux_r->fcs = bsd_r->fpr_env[4]; 186 linux_r->foo = bsd_r->fpr_env[5]; 187 linux_r->fos = bsd_r->fpr_env[6]; 188 bcopy(bsd_r->fpr_acc, linux_r->st_space, sizeof(linux_r->st_space)); 189 } 190 191 static void 192 map_fpregs_from_linux(struct fpreg *bsd_r, struct linux_pt_fpreg *linux_r) 193 { 194 bsd_r->fpr_env[0] = linux_r->cwd; 195 bsd_r->fpr_env[1] = linux_r->swd; 196 bsd_r->fpr_env[2] = linux_r->twd; 197 bsd_r->fpr_env[3] = linux_r->fip; 198 bsd_r->fpr_env[4] = linux_r->fcs; 199 bsd_r->fpr_env[5] = linux_r->foo; 200 bsd_r->fpr_env[6] = linux_r->fos; 201 bcopy(bsd_r->fpr_acc, linux_r->st_space, sizeof(bsd_r->fpr_acc)); 202 } 203 204 struct linux_pt_fpxreg { 205 l_ushort cwd; 206 l_ushort swd; 207 l_ushort twd; 208 l_ushort fop; 209 l_long fip; 210 l_long fcs; 211 l_long foo; 212 l_long fos; 213 l_long mxcsr; 214 l_long reserved; 215 l_long st_space[32]; 216 l_long xmm_space[32]; 217 l_long padding[56]; 218 }; 219 220 #ifdef CPU_ENABLE_SSE 221 static int 222 linux_proc_read_fpxregs(struct thread *td, struct linux_pt_fpxreg *fpxregs) 223 { 224 225 PROC_LOCK_ASSERT(td->td_proc, MA_OWNED); 226 if (cpu_fxsr == 0 || (td->td_proc->p_flag & P_INMEM) == 0) 227 return (EIO); 228 bcopy(&get_pcb_user_save_td(td)->sv_xmm, fpxregs, sizeof(*fpxregs)); 229 return (0); 230 } 231 232 static int 233 linux_proc_write_fpxregs(struct thread *td, struct linux_pt_fpxreg *fpxregs) 234 { 235 236 PROC_LOCK_ASSERT(td->td_proc, MA_OWNED); 237 if (cpu_fxsr == 0 || (td->td_proc->p_flag & P_INMEM) == 0) 238 return (EIO); 239 bcopy(fpxregs, &get_pcb_user_save_td(td)->sv_xmm, sizeof(*fpxregs)); 240 return (0); 241 } 242 #endif 243 244 int 245 linux_ptrace(struct thread *td, struct linux_ptrace_args *uap) 246 { 247 union { 248 struct linux_pt_reg reg; 249 struct linux_pt_fpreg fpreg; 250 struct linux_pt_fpxreg fpxreg; 251 } r; 252 union { 253 struct reg bsd_reg; 254 struct fpreg bsd_fpreg; 255 struct dbreg bsd_dbreg; 256 } u; 257 void *addr; 258 pid_t pid; 259 int error, req; 260 261 error = 0; 262 263 /* by default, just copy data intact */ 264 req = uap->req; 265 pid = (pid_t)uap->pid; 266 addr = (void *)uap->addr; 267 268 switch (req) { 269 case PTRACE_TRACEME: 270 case PTRACE_POKETEXT: 271 case PTRACE_POKEDATA: 272 case PTRACE_KILL: 273 error = kern_ptrace(td, req, pid, addr, uap->data); 274 break; 275 case PTRACE_PEEKTEXT: 276 case PTRACE_PEEKDATA: { 277 /* need to preserve return value */ 278 int rval = td->td_retval[0]; 279 error = kern_ptrace(td, req, pid, addr, 0); 280 if (error == 0) 281 error = copyout(td->td_retval, (void *)uap->data, 282 sizeof(l_int)); 283 td->td_retval[0] = rval; 284 break; 285 } 286 case PTRACE_DETACH: 287 error = kern_ptrace(td, PT_DETACH, pid, (void *)1, 288 map_signum(uap->data)); 289 break; 290 case PTRACE_SINGLESTEP: 291 case PTRACE_CONT: 292 error = kern_ptrace(td, req, pid, (void *)1, 293 map_signum(uap->data)); 294 break; 295 case PTRACE_ATTACH: 296 error = kern_ptrace(td, PT_ATTACH, pid, addr, uap->data); 297 break; 298 case PTRACE_GETREGS: 299 /* Linux is using data where FreeBSD is using addr */ 300 error = kern_ptrace(td, PT_GETREGS, pid, &u.bsd_reg, 0); 301 if (error == 0) { 302 map_regs_to_linux(&u.bsd_reg, &r.reg); 303 error = copyout(&r.reg, (void *)uap->data, 304 sizeof(r.reg)); 305 } 306 break; 307 case PTRACE_SETREGS: 308 /* Linux is using data where FreeBSD is using addr */ 309 error = copyin((void *)uap->data, &r.reg, sizeof(r.reg)); 310 if (error == 0) { 311 map_regs_from_linux(&u.bsd_reg, &r.reg); 312 error = kern_ptrace(td, PT_SETREGS, pid, &u.bsd_reg, 0); 313 } 314 break; 315 case PTRACE_GETFPREGS: 316 /* Linux is using data where FreeBSD is using addr */ 317 error = kern_ptrace(td, PT_GETFPREGS, pid, &u.bsd_fpreg, 0); 318 if (error == 0) { 319 map_fpregs_to_linux(&u.bsd_fpreg, &r.fpreg); 320 error = copyout(&r.fpreg, (void *)uap->data, 321 sizeof(r.fpreg)); 322 } 323 break; 324 case PTRACE_SETFPREGS: 325 /* Linux is using data where FreeBSD is using addr */ 326 error = copyin((void *)uap->data, &r.fpreg, sizeof(r.fpreg)); 327 if (error == 0) { 328 map_fpregs_from_linux(&u.bsd_fpreg, &r.fpreg); 329 error = kern_ptrace(td, PT_SETFPREGS, pid, 330 &u.bsd_fpreg, 0); 331 } 332 break; 333 case PTRACE_SETFPXREGS: 334 #ifdef CPU_ENABLE_SSE 335 error = copyin((void *)uap->data, &r.fpxreg, sizeof(r.fpxreg)); 336 if (error) 337 break; 338 #endif 339 /* FALL THROUGH */ 340 case PTRACE_GETFPXREGS: { 341 #ifdef CPU_ENABLE_SSE 342 struct proc *p; 343 struct thread *td2; 344 345 if (sizeof(struct linux_pt_fpxreg) != sizeof(struct savexmm)) { 346 static int once = 0; 347 if (!once) { 348 printf("linux: savexmm != linux_pt_fpxreg\n"); 349 once = 1; 350 } 351 error = EIO; 352 break; 353 } 354 355 if ((p = pfind(uap->pid)) == NULL) { 356 error = ESRCH; 357 break; 358 } 359 360 /* Exiting processes can't be debugged. */ 361 if ((p->p_flag & P_WEXIT) != 0) { 362 error = ESRCH; 363 goto fail; 364 } 365 366 if ((error = p_candebug(td, p)) != 0) 367 goto fail; 368 369 /* System processes can't be debugged. */ 370 if ((p->p_flag & P_SYSTEM) != 0) { 371 error = EINVAL; 372 goto fail; 373 } 374 375 /* not being traced... */ 376 if ((p->p_flag & P_TRACED) == 0) { 377 error = EPERM; 378 goto fail; 379 } 380 381 /* not being traced by YOU */ 382 if (p->p_pptr != td->td_proc) { 383 error = EBUSY; 384 goto fail; 385 } 386 387 /* not currently stopped */ 388 if (!P_SHOULDSTOP(p) || (p->p_flag & P_WAITED) == 0) { 389 error = EBUSY; 390 goto fail; 391 } 392 393 if (req == PTRACE_GETFPXREGS) { 394 _PHOLD(p); /* may block */ 395 td2 = FIRST_THREAD_IN_PROC(p); 396 error = linux_proc_read_fpxregs(td2, &r.fpxreg); 397 _PRELE(p); 398 PROC_UNLOCK(p); 399 if (error == 0) 400 error = copyout(&r.fpxreg, (void *)uap->data, 401 sizeof(r.fpxreg)); 402 } else { 403 /* clear dangerous bits exactly as Linux does*/ 404 r.fpxreg.mxcsr &= 0xffbf; 405 _PHOLD(p); /* may block */ 406 td2 = FIRST_THREAD_IN_PROC(p); 407 error = linux_proc_write_fpxregs(td2, &r.fpxreg); 408 _PRELE(p); 409 PROC_UNLOCK(p); 410 } 411 break; 412 413 fail: 414 PROC_UNLOCK(p); 415 #else 416 error = EIO; 417 #endif 418 break; 419 } 420 case PTRACE_PEEKUSR: 421 case PTRACE_POKEUSR: { 422 error = EIO; 423 424 /* check addr for alignment */ 425 if (uap->addr < 0 || uap->addr & (sizeof(l_int) - 1)) 426 break; 427 /* 428 * Allow linux programs to access register values in 429 * user struct. We simulate this through PT_GET/SETREGS 430 * as necessary. 431 */ 432 if (uap->addr < sizeof(struct linux_pt_reg)) { 433 error = kern_ptrace(td, PT_GETREGS, pid, &u.bsd_reg, 0); 434 if (error != 0) 435 break; 436 437 map_regs_to_linux(&u.bsd_reg, &r.reg); 438 if (req == PTRACE_PEEKUSR) { 439 error = copyout((char *)&r.reg + uap->addr, 440 (void *)uap->data, sizeof(l_int)); 441 break; 442 } 443 444 *(l_int *)((char *)&r.reg + uap->addr) = 445 (l_int)uap->data; 446 447 map_regs_from_linux(&u.bsd_reg, &r.reg); 448 error = kern_ptrace(td, PT_SETREGS, pid, &u.bsd_reg, 0); 449 } 450 451 /* 452 * Simulate debug registers access 453 */ 454 if (uap->addr >= LINUX_DBREG_OFFSET && 455 uap->addr <= LINUX_DBREG_OFFSET + LINUX_DBREG_SIZE) { 456 error = kern_ptrace(td, PT_GETDBREGS, pid, &u.bsd_dbreg, 457 0); 458 if (error != 0) 459 break; 460 461 uap->addr -= LINUX_DBREG_OFFSET; 462 if (req == PTRACE_PEEKUSR) { 463 error = copyout((char *)&u.bsd_dbreg + 464 uap->addr, (void *)uap->data, 465 sizeof(l_int)); 466 break; 467 } 468 469 *(l_int *)((char *)&u.bsd_dbreg + uap->addr) = 470 uap->data; 471 error = kern_ptrace(td, PT_SETDBREGS, pid, 472 &u.bsd_dbreg, 0); 473 } 474 475 break; 476 } 477 case PTRACE_SYSCALL: 478 /* fall through */ 479 default: 480 printf("linux: ptrace(%u, ...) not implemented\n", 481 (unsigned int)uap->req); 482 error = EINVAL; 483 break; 484 } 485 486 return (error); 487 }
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