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/6.0/sys/i386/linux/linux_ptrace.c 147741 2005-07-02 20:06:44Z delphij $"); 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 49 #if !defined(CPU_DISABLE_SSE) && defined(I686_CPU) 50 #define CPU_ENABLE_SSE 51 #endif 52 53 /* 54 * Linux ptrace requests numbers. Mostly identical to FreeBSD, 55 * except for MD ones and PT_ATTACH/PT_DETACH. 56 */ 57 #define PTRACE_TRACEME 0 58 #define PTRACE_PEEKTEXT 1 59 #define PTRACE_PEEKDATA 2 60 #define PTRACE_PEEKUSR 3 61 #define PTRACE_POKETEXT 4 62 #define PTRACE_POKEDATA 5 63 #define PTRACE_POKEUSR 6 64 #define PTRACE_CONT 7 65 #define PTRACE_KILL 8 66 #define PTRACE_SINGLESTEP 9 67 68 #define PTRACE_ATTACH 16 69 #define PTRACE_DETACH 17 70 71 #define PTRACE_SYSCALL 24 72 73 #define PTRACE_GETREGS 12 74 #define PTRACE_SETREGS 13 75 #define PTRACE_GETFPREGS 14 76 #define PTRACE_SETFPREGS 15 77 #define PTRACE_GETFPXREGS 18 78 #define PTRACE_SETFPXREGS 19 79 80 #define PTRACE_SETOPTIONS 21 81 82 /* 83 * Linux keeps debug registers at the following 84 * offset in the user struct 85 */ 86 #define LINUX_DBREG_OFFSET 252 87 #define LINUX_DBREG_SIZE (8*sizeof(l_int)) 88 89 static __inline int 90 map_signum(int signum) 91 { 92 93 if (signum > 0 && signum <= LINUX_SIGTBLSZ) 94 signum = linux_to_bsd_signal[_SIG_IDX(signum)]; 95 return ((signum == SIGSTOP)? 0 : signum); 96 } 97 98 struct linux_pt_reg { 99 l_long ebx; 100 l_long ecx; 101 l_long edx; 102 l_long esi; 103 l_long edi; 104 l_long ebp; 105 l_long eax; 106 l_int xds; 107 l_int xes; 108 l_int xfs; 109 l_int xgs; 110 l_long orig_eax; 111 l_long eip; 112 l_int xcs; 113 l_long eflags; 114 l_long esp; 115 l_int xss; 116 }; 117 118 /* 119 * Translate i386 ptrace registers between Linux and FreeBSD formats. 120 * The translation is pretty straighforward, for all registers, but 121 * orig_eax on Linux side and r_trapno and r_err in FreeBSD 122 */ 123 static void 124 map_regs_to_linux(struct reg *bsd_r, struct linux_pt_reg *linux_r) 125 { 126 linux_r->ebx = bsd_r->r_ebx; 127 linux_r->ecx = bsd_r->r_ecx; 128 linux_r->edx = bsd_r->r_edx; 129 linux_r->esi = bsd_r->r_esi; 130 linux_r->edi = bsd_r->r_edi; 131 linux_r->ebp = bsd_r->r_ebp; 132 linux_r->eax = bsd_r->r_eax; 133 linux_r->xds = bsd_r->r_ds; 134 linux_r->xes = bsd_r->r_es; 135 linux_r->xfs = bsd_r->r_fs; 136 linux_r->xgs = bsd_r->r_gs; 137 linux_r->orig_eax = bsd_r->r_eax; 138 linux_r->eip = bsd_r->r_eip; 139 linux_r->xcs = bsd_r->r_cs; 140 linux_r->eflags = bsd_r->r_eflags; 141 linux_r->esp = bsd_r->r_esp; 142 linux_r->xss = bsd_r->r_ss; 143 } 144 145 static void 146 map_regs_from_linux(struct reg *bsd_r, struct linux_pt_reg *linux_r) 147 { 148 bsd_r->r_ebx = linux_r->ebx; 149 bsd_r->r_ecx = linux_r->ecx; 150 bsd_r->r_edx = linux_r->edx; 151 bsd_r->r_esi = linux_r->esi; 152 bsd_r->r_edi = linux_r->edi; 153 bsd_r->r_ebp = linux_r->ebp; 154 bsd_r->r_eax = linux_r->eax; 155 bsd_r->r_ds = linux_r->xds; 156 bsd_r->r_es = linux_r->xes; 157 bsd_r->r_fs = linux_r->xfs; 158 bsd_r->r_gs = linux_r->xgs; 159 bsd_r->r_eip = linux_r->eip; 160 bsd_r->r_cs = linux_r->xcs; 161 bsd_r->r_eflags = linux_r->eflags; 162 bsd_r->r_esp = linux_r->esp; 163 bsd_r->r_ss = linux_r->xss; 164 } 165 166 struct linux_pt_fpreg { 167 l_long cwd; 168 l_long swd; 169 l_long twd; 170 l_long fip; 171 l_long fcs; 172 l_long foo; 173 l_long fos; 174 l_long st_space[2*10]; 175 }; 176 177 static void 178 map_fpregs_to_linux(struct fpreg *bsd_r, struct linux_pt_fpreg *linux_r) 179 { 180 linux_r->cwd = bsd_r->fpr_env[0]; 181 linux_r->swd = bsd_r->fpr_env[1]; 182 linux_r->twd = bsd_r->fpr_env[2]; 183 linux_r->fip = bsd_r->fpr_env[3]; 184 linux_r->fcs = bsd_r->fpr_env[4]; 185 linux_r->foo = bsd_r->fpr_env[5]; 186 linux_r->fos = bsd_r->fpr_env[6]; 187 bcopy(bsd_r->fpr_acc, linux_r->st_space, sizeof(linux_r->st_space)); 188 } 189 190 static void 191 map_fpregs_from_linux(struct fpreg *bsd_r, struct linux_pt_fpreg *linux_r) 192 { 193 bsd_r->fpr_env[0] = linux_r->cwd; 194 bsd_r->fpr_env[1] = linux_r->swd; 195 bsd_r->fpr_env[2] = linux_r->twd; 196 bsd_r->fpr_env[3] = linux_r->fip; 197 bsd_r->fpr_env[4] = linux_r->fcs; 198 bsd_r->fpr_env[5] = linux_r->foo; 199 bsd_r->fpr_env[6] = linux_r->fos; 200 bcopy(bsd_r->fpr_acc, linux_r->st_space, sizeof(bsd_r->fpr_acc)); 201 } 202 203 struct linux_pt_fpxreg { 204 l_ushort cwd; 205 l_ushort swd; 206 l_ushort twd; 207 l_ushort fop; 208 l_long fip; 209 l_long fcs; 210 l_long foo; 211 l_long fos; 212 l_long mxcsr; 213 l_long reserved; 214 l_long st_space[32]; 215 l_long xmm_space[32]; 216 l_long padding[56]; 217 }; 218 219 #ifdef CPU_ENABLE_SSE 220 static int 221 linux_proc_read_fpxregs(struct thread *td, struct linux_pt_fpxreg *fpxregs) 222 { 223 224 PROC_LOCK_ASSERT(td->td_proc, MA_OWNED); 225 if (cpu_fxsr == 0 || (td->td_proc->p_sflag & PS_INMEM) == 0) 226 return (EIO); 227 bcopy(&td->td_pcb->pcb_save.sv_xmm, fpxregs, sizeof(*fpxregs)); 228 return (0); 229 } 230 231 static int 232 linux_proc_write_fpxregs(struct thread *td, struct linux_pt_fpxreg *fpxregs) 233 { 234 235 PROC_LOCK_ASSERT(td->td_proc, MA_OWNED); 236 if (cpu_fxsr == 0 || (td->td_proc->p_sflag & PS_INMEM) == 0) 237 return (EIO); 238 bcopy(fpxregs, &td->td_pcb->pcb_save.sv_xmm, sizeof(*fpxregs)); 239 return (0); 240 } 241 #endif 242 243 int 244 linux_ptrace(struct thread *td, struct linux_ptrace_args *uap) 245 { 246 union { 247 struct linux_pt_reg reg; 248 struct linux_pt_fpreg fpreg; 249 struct linux_pt_fpxreg fpxreg; 250 } r; 251 union { 252 struct reg bsd_reg; 253 struct fpreg bsd_fpreg; 254 struct dbreg bsd_dbreg; 255 } u; 256 void *addr; 257 pid_t pid; 258 int error, req; 259 260 error = 0; 261 262 /* by default, just copy data intact */ 263 req = uap->req; 264 pid = (pid_t)uap->pid; 265 addr = (void *)uap->addr; 266 267 switch (req) { 268 case PTRACE_TRACEME: 269 case PTRACE_POKETEXT: 270 case PTRACE_POKEDATA: 271 case PTRACE_KILL: 272 error = kern_ptrace(td, req, pid, addr, uap->data); 273 break; 274 case PTRACE_PEEKTEXT: 275 case PTRACE_PEEKDATA: { 276 /* need to preserve return value */ 277 int rval = td->td_retval[0]; 278 error = kern_ptrace(td, req, pid, addr, 0); 279 if (error == 0) 280 error = copyout(td->td_retval, (void *)uap->data, 281 sizeof(l_int)); 282 td->td_retval[0] = rval; 283 break; 284 } 285 case PTRACE_DETACH: 286 error = kern_ptrace(td, PT_DETACH, pid, (void *)1, 287 map_signum(uap->data)); 288 break; 289 case PTRACE_SINGLESTEP: 290 case PTRACE_CONT: 291 error = kern_ptrace(td, req, pid, (void *)1, 292 map_signum(uap->data)); 293 break; 294 case PTRACE_ATTACH: 295 error = kern_ptrace(td, PT_ATTACH, pid, addr, uap->data); 296 break; 297 case PTRACE_GETREGS: 298 /* Linux is using data where FreeBSD is using addr */ 299 error = kern_ptrace(td, PT_GETREGS, pid, &u.bsd_reg, 0); 300 if (error == 0) { 301 map_regs_to_linux(&u.bsd_reg, &r.reg); 302 error = copyout(&r.reg, (void *)uap->data, 303 sizeof(r.reg)); 304 } 305 break; 306 case PTRACE_SETREGS: 307 /* Linux is using data where FreeBSD is using addr */ 308 error = copyin((void *)uap->data, &r.reg, sizeof(r.reg)); 309 if (error == 0) { 310 map_regs_from_linux(&u.bsd_reg, &r.reg); 311 error = kern_ptrace(td, PT_SETREGS, pid, &u.bsd_reg, 0); 312 } 313 break; 314 case PTRACE_GETFPREGS: 315 /* Linux is using data where FreeBSD is using addr */ 316 error = kern_ptrace(td, PT_GETFPREGS, pid, &u.bsd_fpreg, 0); 317 if (error == 0) { 318 map_fpregs_to_linux(&u.bsd_fpreg, &r.fpreg); 319 error = copyout(&r.fpreg, (void *)uap->data, 320 sizeof(r.fpreg)); 321 } 322 break; 323 case PTRACE_SETFPREGS: 324 /* Linux is using data where FreeBSD is using addr */ 325 error = copyin((void *)uap->data, &r.fpreg, sizeof(r.fpreg)); 326 if (error == 0) { 327 map_fpregs_from_linux(&u.bsd_fpreg, &r.fpreg); 328 error = kern_ptrace(td, PT_SETFPREGS, pid, 329 &u.bsd_fpreg, 0); 330 } 331 break; 332 case PTRACE_SETFPXREGS: 333 #ifdef CPU_ENABLE_SSE 334 error = copyin((void *)uap->data, &r.fpxreg, sizeof(r.fpxreg)); 335 if (error) 336 break; 337 #endif 338 /* FALL THROUGH */ 339 case PTRACE_GETFPXREGS: { 340 #ifdef CPU_ENABLE_SSE 341 struct proc *p; 342 struct thread *td2; 343 344 if (sizeof(struct linux_pt_fpxreg) != sizeof(struct savexmm)) { 345 static int once = 0; 346 if (!once) { 347 printf("linux: savexmm != linux_pt_fpxreg\n"); 348 once = 1; 349 } 350 error = EIO; 351 break; 352 } 353 354 if ((p = pfind(uap->pid)) == NULL) { 355 error = ESRCH; 356 break; 357 } 358 359 if ((error = p_candebug(td, p)) != 0) 360 goto fail; 361 362 /* System processes can't be debugged. */ 363 if ((p->p_flag & P_SYSTEM) != 0) { 364 error = EINVAL; 365 goto fail; 366 } 367 368 /* not being traced... */ 369 if ((p->p_flag & P_TRACED) == 0) { 370 error = EPERM; 371 goto fail; 372 } 373 374 /* not being traced by YOU */ 375 if (p->p_pptr != td->td_proc) { 376 error = EBUSY; 377 goto fail; 378 } 379 380 /* not currently stopped */ 381 if (!P_SHOULDSTOP(p) || (p->p_flag & P_WAITED) == 0) { 382 error = EBUSY; 383 goto fail; 384 } 385 386 if (req == PTRACE_GETFPXREGS) { 387 _PHOLD(p); /* may block */ 388 td2 = FIRST_THREAD_IN_PROC(p); 389 error = linux_proc_read_fpxregs(td2, &r.fpxreg); 390 _PRELE(p); 391 PROC_UNLOCK(p); 392 if (error == 0) 393 error = copyout(&r.fpxreg, (void *)uap->data, 394 sizeof(r.fpxreg)); 395 } else { 396 /* clear dangerous bits exactly as Linux does*/ 397 r.fpxreg.mxcsr &= 0xffbf; 398 _PHOLD(p); /* may block */ 399 td2 = FIRST_THREAD_IN_PROC(p); 400 error = linux_proc_write_fpxregs(td2, &r.fpxreg); 401 _PRELE(p); 402 PROC_UNLOCK(p); 403 } 404 break; 405 406 fail: 407 PROC_UNLOCK(p); 408 #else 409 error = EIO; 410 #endif 411 break; 412 } 413 case PTRACE_PEEKUSR: 414 case PTRACE_POKEUSR: { 415 error = EIO; 416 417 /* check addr for alignment */ 418 if (uap->addr < 0 || uap->addr & (sizeof(l_int) - 1)) 419 break; 420 /* 421 * Allow linux programs to access register values in 422 * user struct. We simulate this through PT_GET/SETREGS 423 * as necessary. 424 */ 425 if (uap->addr < sizeof(struct linux_pt_reg)) { 426 error = kern_ptrace(td, PT_GETREGS, pid, &u.bsd_reg, 0); 427 if (error != 0) 428 break; 429 430 map_regs_to_linux(&u.bsd_reg, &r.reg); 431 if (req == PTRACE_PEEKUSR) { 432 error = copyout((char *)&r.reg + uap->addr, 433 (void *)uap->data, sizeof(l_int)); 434 break; 435 } 436 437 *(l_int *)((char *)&r.reg + uap->addr) = 438 (l_int)uap->data; 439 440 map_regs_from_linux(&u.bsd_reg, &r.reg); 441 error = kern_ptrace(td, PT_SETREGS, pid, &u.bsd_reg, 0); 442 } 443 444 /* 445 * Simulate debug registers access 446 */ 447 if (uap->addr >= LINUX_DBREG_OFFSET && 448 uap->addr <= LINUX_DBREG_OFFSET + LINUX_DBREG_SIZE) { 449 error = kern_ptrace(td, PT_GETDBREGS, pid, &u.bsd_dbreg, 450 0); 451 if (error != 0) 452 break; 453 454 uap->addr -= LINUX_DBREG_OFFSET; 455 if (req == PTRACE_PEEKUSR) { 456 error = copyout((char *)&u.bsd_dbreg + 457 uap->addr, (void *)uap->data, 458 sizeof(l_int)); 459 break; 460 } 461 462 *(l_int *)((char *)&u.bsd_dbreg + uap->addr) = 463 uap->data; 464 error = kern_ptrace(td, PT_SETDBREGS, pid, 465 &u.bsd_dbreg, 0); 466 } 467 468 break; 469 } 470 case PTRACE_SYSCALL: 471 /* fall through */ 472 default: 473 printf("linux: ptrace(%u, ...) not implemented\n", 474 (unsigned int)uap->req); 475 error = EINVAL; 476 break; 477 } 478 479 return (error); 480 }
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