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 * $FreeBSD: releng/5.1/sys/i386/linux/linux_ptrace.c 113868 2003-04-22 20:01:56Z jhb $ 29 */ 30 31 #include "opt_cpu.h" 32 33 #include <sys/param.h> 34 #include <sys/lock.h> 35 #include <sys/mutex.h> 36 #include <sys/proc.h> 37 #include <sys/ptrace.h> 38 #include <sys/syscallsubr.h> 39 #include <sys/systm.h> 40 41 #include <machine/md_var.h> 42 #include <machine/pcb.h> 43 #include <machine/reg.h> 44 45 #include <i386/linux/linux.h> 46 #include <i386/linux/linux_proto.h> 47 48 #if !defined(CPU_ENABLE_SSE) && defined(I686_CPU) 49 #define CPU_ENABLE_SSE 50 #endif 51 #if defined(CPU_DISABLE_SSE) 52 #undef CPU_ENABLE_SSE 53 #endif 54 55 /* 56 * Linux ptrace requests numbers. Mostly identical to FreeBSD, 57 * except for MD ones and PT_ATTACH/PT_DETACH. 58 */ 59 #define PTRACE_TRACEME 0 60 #define PTRACE_PEEKTEXT 1 61 #define PTRACE_PEEKDATA 2 62 #define PTRACE_PEEKUSR 3 63 #define PTRACE_POKETEXT 4 64 #define PTRACE_POKEDATA 5 65 #define PTRACE_POKEUSR 6 66 #define PTRACE_CONT 7 67 #define PTRACE_KILL 8 68 #define PTRACE_SINGLESTEP 9 69 70 #define PTRACE_ATTACH 16 71 #define PTRACE_DETACH 17 72 73 #define PTRACE_SYSCALL 24 74 75 #define PTRACE_GETREGS 12 76 #define PTRACE_SETREGS 13 77 #define PTRACE_GETFPREGS 14 78 #define PTRACE_SETFPREGS 15 79 #define PTRACE_GETFPXREGS 18 80 #define PTRACE_SETFPXREGS 19 81 82 #define PTRACE_SETOPTIONS 21 83 84 /* 85 * Linux keeps debug registers at the following 86 * offset in the user struct 87 */ 88 #define LINUX_DBREG_OFFSET 252 89 #define LINUX_DBREG_SIZE (8*sizeof(l_int)) 90 91 static __inline__ int 92 map_signum(int signum) 93 { 94 95 if (signum > 0 && signum <= LINUX_SIGTBLSZ) 96 signum = linux_to_bsd_signal[_SIG_IDX(signum)]; 97 return ((signum == SIGSTOP)? 0 : signum); 98 } 99 100 struct linux_pt_reg { 101 l_long ebx; 102 l_long ecx; 103 l_long edx; 104 l_long esi; 105 l_long edi; 106 l_long ebp; 107 l_long eax; 108 l_int xds; 109 l_int xes; 110 l_int xfs; 111 l_int xgs; 112 l_long orig_eax; 113 l_long eip; 114 l_int xcs; 115 l_long eflags; 116 l_long esp; 117 l_int xss; 118 }; 119 120 /* 121 * Translate i386 ptrace registers between Linux and FreeBSD formats. 122 * The translation is pretty straighforward, for all registers, but 123 * orig_eax on Linux side and r_trapno and r_err in FreeBSD 124 */ 125 static void 126 map_regs_to_linux(struct reg *bsd_r, struct linux_pt_reg *linux_r) 127 { 128 linux_r->ebx = bsd_r->r_ebx; 129 linux_r->ecx = bsd_r->r_ecx; 130 linux_r->edx = bsd_r->r_edx; 131 linux_r->esi = bsd_r->r_esi; 132 linux_r->edi = bsd_r->r_edi; 133 linux_r->ebp = bsd_r->r_ebp; 134 linux_r->eax = bsd_r->r_eax; 135 linux_r->xds = bsd_r->r_ds; 136 linux_r->xes = bsd_r->r_es; 137 linux_r->xfs = bsd_r->r_fs; 138 linux_r->xgs = bsd_r->r_gs; 139 linux_r->orig_eax = bsd_r->r_eax; 140 linux_r->eip = bsd_r->r_eip; 141 linux_r->xcs = bsd_r->r_cs; 142 linux_r->eflags = bsd_r->r_eflags; 143 linux_r->esp = bsd_r->r_esp; 144 linux_r->xss = bsd_r->r_ss; 145 } 146 147 static void 148 map_regs_from_linux(struct reg *bsd_r, struct linux_pt_reg *linux_r) 149 { 150 bsd_r->r_ebx = linux_r->ebx; 151 bsd_r->r_ecx = linux_r->ecx; 152 bsd_r->r_edx = linux_r->edx; 153 bsd_r->r_esi = linux_r->esi; 154 bsd_r->r_edi = linux_r->edi; 155 bsd_r->r_ebp = linux_r->ebp; 156 bsd_r->r_eax = linux_r->eax; 157 bsd_r->r_ds = linux_r->xds; 158 bsd_r->r_es = linux_r->xes; 159 bsd_r->r_fs = linux_r->xfs; 160 bsd_r->r_gs = linux_r->xgs; 161 bsd_r->r_eip = linux_r->eip; 162 bsd_r->r_cs = linux_r->xcs; 163 bsd_r->r_eflags = linux_r->eflags; 164 bsd_r->r_esp = linux_r->esp; 165 bsd_r->r_ss = linux_r->xss; 166 } 167 168 struct linux_pt_fpreg { 169 l_long cwd; 170 l_long swd; 171 l_long twd; 172 l_long fip; 173 l_long fcs; 174 l_long foo; 175 l_long fos; 176 l_long st_space[2*10]; 177 }; 178 179 static void 180 map_fpregs_to_linux(struct fpreg *bsd_r, struct linux_pt_fpreg *linux_r) 181 { 182 linux_r->cwd = bsd_r->fpr_env[0]; 183 linux_r->swd = bsd_r->fpr_env[1]; 184 linux_r->twd = bsd_r->fpr_env[2]; 185 linux_r->fip = bsd_r->fpr_env[3]; 186 linux_r->fcs = bsd_r->fpr_env[4]; 187 linux_r->foo = bsd_r->fpr_env[5]; 188 linux_r->fos = bsd_r->fpr_env[6]; 189 bcopy(bsd_r->fpr_acc, linux_r->st_space, sizeof(linux_r->st_space)); 190 } 191 192 static void 193 map_fpregs_from_linux(struct fpreg *bsd_r, struct linux_pt_fpreg *linux_r) 194 { 195 bsd_r->fpr_env[0] = linux_r->cwd; 196 bsd_r->fpr_env[1] = linux_r->swd; 197 bsd_r->fpr_env[2] = linux_r->twd; 198 bsd_r->fpr_env[3] = linux_r->fip; 199 bsd_r->fpr_env[4] = linux_r->fcs; 200 bsd_r->fpr_env[5] = linux_r->foo; 201 bsd_r->fpr_env[6] = linux_r->fos; 202 bcopy(bsd_r->fpr_acc, linux_r->st_space, sizeof(bsd_r->fpr_acc)); 203 } 204 205 struct linux_pt_fpxreg { 206 l_ushort cwd; 207 l_ushort swd; 208 l_ushort twd; 209 l_ushort fop; 210 l_long fip; 211 l_long fcs; 212 l_long foo; 213 l_long fos; 214 l_long mxcsr; 215 l_long reserved; 216 l_long st_space[32]; 217 l_long xmm_space[32]; 218 l_long padding[56]; 219 }; 220 221 #ifdef CPU_ENABLE_SSE 222 static int 223 linux_proc_read_fpxregs(struct thread *td, struct linux_pt_fpxreg *fpxregs) 224 { 225 226 PROC_LOCK_ASSERT(td->td_proc, MA_OWNED); 227 if (cpu_fxsr == 0 || (td->td_proc->p_sflag & PS_INMEM) == 0) 228 return (EIO); 229 bcopy(&td->td_pcb->pcb_save.sv_xmm, fpxregs, sizeof(*fpxregs)); 230 return (0); 231 } 232 233 static int 234 linux_proc_write_fpxregs(struct thread *td, struct linux_pt_fpxreg *fpxregs) 235 { 236 237 PROC_LOCK_ASSERT(td->td_proc, MA_OWNED); 238 if (cpu_fxsr == 0 || (td->td_proc->p_sflag & PS_INMEM) == 0) 239 return (EIO); 240 bcopy(fpxregs, &td->td_pcb->pcb_save.sv_xmm, sizeof(*fpxregs)); 241 return (0); 242 } 243 #endif 244 245 int 246 linux_ptrace(struct thread *td, struct linux_ptrace_args *uap) 247 { 248 union { 249 struct linux_pt_reg reg; 250 struct linux_pt_fpreg fpreg; 251 struct linux_pt_fpxreg fpxreg; 252 } r; 253 union { 254 struct reg bsd_reg; 255 struct fpreg bsd_fpreg; 256 struct dbreg bsd_dbreg; 257 } u; 258 void *addr; 259 pid_t pid; 260 int error, req; 261 262 error = 0; 263 264 /* by default, just copy data intact */ 265 req = uap->req; 266 pid = (pid_t)uap->pid; 267 addr = (void *)uap->addr; 268 269 switch (req) { 270 case PTRACE_TRACEME: 271 case PTRACE_POKETEXT: 272 case PTRACE_POKEDATA: 273 case PTRACE_KILL: 274 error = kern_ptrace(td, req, pid, addr, uap->data); 275 break; 276 case PTRACE_PEEKTEXT: 277 case PTRACE_PEEKDATA: { 278 /* need to preserve return value */ 279 int rval = td->td_retval[0]; 280 error = kern_ptrace(td, req, pid, addr, 0); 281 if (error == 0) 282 error = copyout(td->td_retval, (void *)uap->data, 283 sizeof(l_int)); 284 td->td_retval[0] = rval; 285 break; 286 } 287 case PTRACE_DETACH: 288 error = kern_ptrace(td, PT_DETACH, pid, (void *)1, 289 map_signum(uap->data)); 290 break; 291 case PTRACE_SINGLESTEP: 292 case PTRACE_CONT: 293 error = kern_ptrace(td, req, pid, (void *)1, 294 map_signum(uap->data)); 295 break; 296 case PTRACE_ATTACH: 297 error = kern_ptrace(td, PT_ATTACH, pid, addr, uap->data); 298 break; 299 case PTRACE_GETREGS: 300 /* Linux is using data where FreeBSD is using addr */ 301 error = kern_ptrace(td, PT_GETREGS, pid, &u.bsd_reg, 0); 302 if (error == 0) { 303 map_regs_to_linux(&u.bsd_reg, &r.reg); 304 error = copyout(&r.reg, (void *)uap->data, 305 sizeof(r.reg)); 306 } 307 break; 308 case PTRACE_SETREGS: 309 /* Linux is using data where FreeBSD is using addr */ 310 error = copyin((void *)uap->data, &r.reg, sizeof(r.reg)); 311 if (error == 0) { 312 map_regs_from_linux(&u.bsd_reg, &r.reg); 313 error = kern_ptrace(td, PT_SETREGS, pid, &u.bsd_reg, 0); 314 } 315 break; 316 case PTRACE_GETFPREGS: 317 /* Linux is using data where FreeBSD is using addr */ 318 error = kern_ptrace(td, PT_GETFPREGS, pid, &u.bsd_fpreg, 0); 319 if (error == 0) { 320 map_fpregs_to_linux(&u.bsd_fpreg, &r.fpreg); 321 error = copyout(&r.fpreg, (void *)uap->data, 322 sizeof(r.fpreg)); 323 } 324 break; 325 case PTRACE_SETFPREGS: 326 /* Linux is using data where FreeBSD is using addr */ 327 error = copyin((void *)uap->data, &r.fpreg, sizeof(r.fpreg)); 328 if (error == 0) { 329 map_fpregs_from_linux(&u.bsd_fpreg, &r.fpreg); 330 error = kern_ptrace(td, PT_SETFPREGS, pid, 331 &u.bsd_fpreg, 0); 332 } 333 break; 334 case PTRACE_SETFPXREGS: 335 #ifdef CPU_ENABLE_SSE 336 error = copyin((void *)uap->data, &r.fpxreg, sizeof(r.fpxreg)); 337 if (error) 338 break; 339 #endif 340 /* FALL THROUGH */ 341 case PTRACE_GETFPXREGS: { 342 #ifdef CPU_ENABLE_SSE 343 struct proc *p; 344 struct thread *td2; 345 346 if (sizeof(struct linux_pt_fpxreg) != sizeof(struct savexmm)) { 347 static int once = 0; 348 if (!once) { 349 printf("linux: savexmm != linux_pt_fpxreg\n"); 350 once = 1; 351 } 352 error = EIO; 353 break; 354 } 355 356 if ((p = pfind(uap->pid)) == NULL) { 357 error = ESRCH; 358 break; 359 } 360 361 if ((error = p_candebug(td, p)) != 0) 362 goto fail; 363 364 /* System processes can't be debugged. */ 365 if ((p->p_flag & P_SYSTEM) != 0) { 366 error = EINVAL; 367 goto fail; 368 } 369 370 /* not being traced... */ 371 if ((p->p_flag & P_TRACED) == 0) { 372 error = EPERM; 373 goto fail; 374 } 375 376 /* not being traced by YOU */ 377 if (p->p_pptr != td->td_proc) { 378 error = EBUSY; 379 goto fail; 380 } 381 382 /* not currently stopped */ 383 if (!P_SHOULDSTOP(p) || (p->p_flag & P_WAITED) == 0) { 384 error = EBUSY; 385 goto fail; 386 } 387 388 td2 = FIRST_THREAD_IN_PROC(p); 389 if (req == PTRACE_GETFPXREGS) { 390 _PHOLD(p); 391 error = linux_proc_read_fpxregs(td2, &r.fpxreg); 392 _PRELE(p); 393 PROC_UNLOCK(p); 394 if (error == 0) 395 error = copyout(&r.fpxreg, (void *)uap->data, 396 sizeof(r.fpxreg)); 397 } else { 398 /* clear dangerous bits exactly as Linux does*/ 399 r.fpxreg.mxcsr &= 0xffbf; 400 _PHOLD(p); 401 error = linux_proc_write_fpxregs(td2, &r.fpxreg); 402 _PRELE(p); 403 PROC_UNLOCK(p); 404 } 405 break; 406 407 fail: 408 PROC_UNLOCK(p); 409 #else 410 error = EIO; 411 #endif 412 break; 413 } 414 case PTRACE_PEEKUSR: 415 case PTRACE_POKEUSR: { 416 error = EIO; 417 418 /* check addr for alignment */ 419 if (uap->addr < 0 || uap->addr & (sizeof(l_int) - 1)) 420 break; 421 /* 422 * Allow linux programs to access register values in 423 * user struct. We simulate this through PT_GET/SETREGS 424 * as necessary. 425 */ 426 if (uap->addr < sizeof(struct linux_pt_reg)) { 427 error = kern_ptrace(td, PT_GETREGS, pid, &u.bsd_reg, 0); 428 if (error != 0) 429 break; 430 431 map_regs_to_linux(&u.bsd_reg, &r.reg); 432 if (req == PTRACE_PEEKUSR) { 433 error = copyout((char *)&r.reg + uap->addr, 434 (void *)uap->data, sizeof(l_int)); 435 break; 436 } 437 438 *(l_int *)((char *)&r.reg + uap->addr) = 439 (l_int)uap->data; 440 441 map_regs_from_linux(&u.bsd_reg, &r.reg); 442 error = kern_ptrace(td, PT_SETREGS, pid, &u.bsd_reg, 0); 443 } 444 445 /* 446 * Simulate debug registers access 447 */ 448 if (uap->addr >= LINUX_DBREG_OFFSET && 449 uap->addr <= LINUX_DBREG_OFFSET + LINUX_DBREG_SIZE) { 450 error = kern_ptrace(td, PT_GETDBREGS, pid, &u.bsd_dbreg, 451 0); 452 if (error != 0) 453 break; 454 455 uap->addr -= LINUX_DBREG_OFFSET; 456 if (req == PTRACE_PEEKUSR) { 457 error = copyout((char *)&u.bsd_dbreg + 458 uap->addr, (void *)uap->data, 459 sizeof(l_int)); 460 break; 461 } 462 463 *(l_int *)((char *)&u.bsd_dbreg + uap->addr) = 464 uap->data; 465 error = kern_ptrace(td, PT_SETDBREGS, pid, 466 &u.bsd_dbreg, 0); 467 } 468 469 break; 470 } 471 case PTRACE_SYSCALL: 472 /* fall through */ 473 default: 474 printf("linux: ptrace(%u, ...) not implemented\n", 475 (unsigned int)uap->req); 476 error = EINVAL; 477 break; 478 } 479 480 return (error); 481 }
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