1 /* 2 * This file is subject to the terms and conditions of the GNU General Public 3 * License. See the file "COPYING" in the main directory of this archive 4 * for more details. 5 * 6 * Copyright (C) 1992 Ross Biro 7 * Copyright (C) Linus Torvalds 8 * Copyright (C) 1994, 95, 96, 97, 98, 2000 Ralf Baechle 9 * Copyright (C) 1996 David S. Miller 10 * Kevin D. Kissell, kevink@mips.com and Carsten Langgaard, carstenl@mips.com 11 * Copyright (C) 1999 MIPS Technologies, Inc. 12 * Copyright (C) 2000 Ulf Carlsson 13 * 14 * At this time Linux/MIPS64 only supports syscall tracing, even for 32-bit 15 * binaries. 16 */ 17 #include <linux/compiler.h> 18 #include <linux/kernel.h> 19 #include <linux/sched.h> 20 #include <linux/mm.h> 21 #include <linux/errno.h> 22 #include <linux/ptrace.h> 23 #include <linux/smp.h> 24 #include <linux/smp_lock.h> 25 #include <linux/user.h> 26 #include <linux/security.h> 27 28 #include <asm/cpu.h> 29 #include <asm/dsp.h> 30 #include <asm/fpu.h> 31 #include <asm/mipsregs.h> 32 #include <asm/mipsmtregs.h> 33 #include <asm/pgtable.h> 34 #include <asm/page.h> 35 #include <asm/system.h> 36 #include <asm/uaccess.h> 37 #include <asm/bootinfo.h> 38 39 int ptrace_getregs (struct task_struct *child, __s64 __user *data); 40 int ptrace_setregs (struct task_struct *child, __s64 __user *data); 41 42 int ptrace_getfpregs (struct task_struct *child, __u32 __user *data); 43 int ptrace_setfpregs (struct task_struct *child, __u32 __user *data); 44 45 /* 46 * Tracing a 32-bit process with a 64-bit strace and vice versa will not 47 * work. I don't know how to fix this. 48 */ 49 asmlinkage int sys32_ptrace(int request, int pid, int addr, int data) 50 { 51 struct task_struct *child; 52 int ret; 53 54 #if 0 55 printk("ptrace(r=%d,pid=%d,addr=%08lx,data=%08lx)\n", 56 (int) request, (int) pid, (unsigned long) addr, 57 (unsigned long) data); 58 #endif 59 lock_kernel(); 60 if (request == PTRACE_TRACEME) { 61 ret = ptrace_traceme(); 62 goto out; 63 } 64 65 child = ptrace_get_task_struct(pid); 66 if (IS_ERR(child)) { 67 ret = PTR_ERR(child); 68 goto out; 69 } 70 71 if (request == PTRACE_ATTACH) { 72 ret = ptrace_attach(child); 73 goto out_tsk; 74 } 75 76 ret = ptrace_check_attach(child, request == PTRACE_KILL); 77 if (ret < 0) 78 goto out_tsk; 79 80 switch (request) { 81 /* when I and D space are separate, these will need to be fixed. */ 82 case PTRACE_PEEKTEXT: /* read word at location addr. */ 83 case PTRACE_PEEKDATA: { 84 unsigned int tmp; 85 int copied; 86 87 copied = access_process_vm(child, addr, &tmp, sizeof(tmp), 0); 88 ret = -EIO; 89 if (copied != sizeof(tmp)) 90 break; 91 ret = put_user(tmp, (unsigned int __user *) (unsigned long) data); 92 break; 93 } 94 95 /* 96 * Read 4 bytes of the other process' storage 97 * data is a pointer specifying where the user wants the 98 * 4 bytes copied into 99 * addr is a pointer in the user's storage that contains an 8 byte 100 * address in the other process of the 4 bytes that is to be read 101 * (this is run in a 32-bit process looking at a 64-bit process) 102 * when I and D space are separate, these will need to be fixed. 103 */ 104 case PTRACE_PEEKTEXT_3264: 105 case PTRACE_PEEKDATA_3264: { 106 u32 tmp; 107 int copied; 108 u32 __user * addrOthers; 109 110 ret = -EIO; 111 112 /* Get the addr in the other process that we want to read */ 113 if (get_user(addrOthers, (u32 __user * __user *) (unsigned long) addr) != 0) 114 break; 115 116 copied = access_process_vm(child, (u64)addrOthers, &tmp, 117 sizeof(tmp), 0); 118 if (copied != sizeof(tmp)) 119 break; 120 ret = put_user(tmp, (u32 __user *) (unsigned long) data); 121 break; 122 } 123 124 /* Read the word at location addr in the USER area. */ 125 case PTRACE_PEEKUSR: { 126 struct pt_regs *regs; 127 unsigned int tmp; 128 129 regs = task_pt_regs(child); 130 ret = 0; /* Default return value. */ 131 132 switch (addr) { 133 case 0 ... 31: 134 tmp = regs->regs[addr]; 135 break; 136 case FPR_BASE ... FPR_BASE + 31: 137 if (tsk_used_math(child)) { 138 fpureg_t *fregs = get_fpu_regs(child); 139 140 /* 141 * The odd registers are actually the high 142 * order bits of the values stored in the even 143 * registers - unless we're using r2k_switch.S. 144 */ 145 if (addr & 1) 146 tmp = (unsigned long) (fregs[((addr & ~1) - 32)] >> 32); 147 else 148 tmp = (unsigned long) (fregs[(addr - 32)] & 0xffffffff); 149 } else { 150 tmp = -1; /* FP not yet used */ 151 } 152 break; 153 case PC: 154 tmp = regs->cp0_epc; 155 break; 156 case CAUSE: 157 tmp = regs->cp0_cause; 158 break; 159 case BADVADDR: 160 tmp = regs->cp0_badvaddr; 161 break; 162 case MMHI: 163 tmp = regs->hi; 164 break; 165 case MMLO: 166 tmp = regs->lo; 167 break; 168 case FPC_CSR: 169 if (cpu_has_fpu) 170 tmp = child->thread.fpu.hard.fcr31; 171 else 172 tmp = child->thread.fpu.soft.fcr31; 173 break; 174 case FPC_EIR: { /* implementation / version register */ 175 unsigned int flags; 176 177 if (!cpu_has_fpu) { 178 tmp = 0; 179 break; 180 } 181 182 preempt_disable(); 183 if (cpu_has_mipsmt) { 184 unsigned int vpflags = dvpe(); 185 flags = read_c0_status(); 186 __enable_fpu(); 187 __asm__ __volatile__("cfc1\t%0,$0": "=r" (tmp)); 188 write_c0_status(flags); 189 evpe(vpflags); 190 } else { 191 flags = read_c0_status(); 192 __enable_fpu(); 193 __asm__ __volatile__("cfc1\t%0,$0": "=r" (tmp)); 194 write_c0_status(flags); 195 } 196 preempt_enable(); 197 break; 198 } 199 case DSP_BASE ... DSP_BASE + 5: { 200 dspreg_t *dregs; 201 202 if (!cpu_has_dsp) { 203 tmp = 0; 204 ret = -EIO; 205 goto out_tsk; 206 } 207 dregs = __get_dsp_regs(child); 208 tmp = (unsigned long) (dregs[addr - DSP_BASE]); 209 break; 210 } 211 case DSP_CONTROL: 212 if (!cpu_has_dsp) { 213 tmp = 0; 214 ret = -EIO; 215 goto out_tsk; 216 } 217 tmp = child->thread.dsp.dspcontrol; 218 break; 219 default: 220 tmp = 0; 221 ret = -EIO; 222 goto out_tsk; 223 } 224 ret = put_user(tmp, (unsigned __user *) (unsigned long) data); 225 break; 226 } 227 228 /* when I and D space are separate, this will have to be fixed. */ 229 case PTRACE_POKETEXT: /* write the word at location addr. */ 230 case PTRACE_POKEDATA: 231 ret = 0; 232 if (access_process_vm(child, addr, &data, sizeof(data), 1) 233 == sizeof(data)) 234 break; 235 ret = -EIO; 236 break; 237 238 /* 239 * Write 4 bytes into the other process' storage 240 * data is the 4 bytes that the user wants written 241 * addr is a pointer in the user's storage that contains an 242 * 8 byte address in the other process where the 4 bytes 243 * that is to be written 244 * (this is run in a 32-bit process looking at a 64-bit process) 245 * when I and D space are separate, these will need to be fixed. 246 */ 247 case PTRACE_POKETEXT_3264: 248 case PTRACE_POKEDATA_3264: { 249 u32 __user * addrOthers; 250 251 /* Get the addr in the other process that we want to write into */ 252 ret = -EIO; 253 if (get_user(addrOthers, (u32 __user * __user *) (unsigned long) addr) != 0) 254 break; 255 ret = 0; 256 if (access_process_vm(child, (u64)addrOthers, &data, 257 sizeof(data), 1) == sizeof(data)) 258 break; 259 ret = -EIO; 260 break; 261 } 262 263 case PTRACE_POKEUSR: { 264 struct pt_regs *regs; 265 ret = 0; 266 regs = task_pt_regs(child); 267 268 switch (addr) { 269 case 0 ... 31: 270 regs->regs[addr] = data; 271 break; 272 case FPR_BASE ... FPR_BASE + 31: { 273 fpureg_t *fregs = get_fpu_regs(child); 274 275 if (!tsk_used_math(child)) { 276 /* FP not yet used */ 277 memset(&child->thread.fpu.hard, ~0, 278 sizeof(child->thread.fpu.hard)); 279 child->thread.fpu.hard.fcr31 = 0; 280 } 281 /* 282 * The odd registers are actually the high order bits 283 * of the values stored in the even registers - unless 284 * we're using r2k_switch.S. 285 */ 286 if (addr & 1) { 287 fregs[(addr & ~1) - FPR_BASE] &= 0xffffffff; 288 fregs[(addr & ~1) - FPR_BASE] |= ((unsigned long long) data) << 32; 289 } else { 290 fregs[addr - FPR_BASE] &= ~0xffffffffLL; 291 /* Must cast, lest sign extension fill upper 292 bits! */ 293 fregs[addr - FPR_BASE] |= (unsigned int)data; 294 } 295 break; 296 } 297 case PC: 298 regs->cp0_epc = data; 299 break; 300 case MMHI: 301 regs->hi = data; 302 break; 303 case MMLO: 304 regs->lo = data; 305 break; 306 case FPC_CSR: 307 if (cpu_has_fpu) 308 child->thread.fpu.hard.fcr31 = data; 309 else 310 child->thread.fpu.soft.fcr31 = data; 311 break; 312 case DSP_BASE ... DSP_BASE + 5: { 313 dspreg_t *dregs; 314 315 if (!cpu_has_dsp) { 316 ret = -EIO; 317 break; 318 } 319 320 dregs = __get_dsp_regs(child); 321 dregs[addr - DSP_BASE] = data; 322 break; 323 } 324 case DSP_CONTROL: 325 if (!cpu_has_dsp) { 326 ret = -EIO; 327 break; 328 } 329 child->thread.dsp.dspcontrol = data; 330 break; 331 default: 332 /* The rest are not allowed. */ 333 ret = -EIO; 334 break; 335 } 336 break; 337 } 338 339 case PTRACE_GETREGS: 340 ret = ptrace_getregs (child, (__u64 __user *) (__u64) data); 341 break; 342 343 case PTRACE_SETREGS: 344 ret = ptrace_setregs (child, (__u64 __user *) (__u64) data); 345 break; 346 347 case PTRACE_GETFPREGS: 348 ret = ptrace_getfpregs (child, (__u32 __user *) (__u64) data); 349 break; 350 351 case PTRACE_SETFPREGS: 352 ret = ptrace_setfpregs (child, (__u32 __user *) (__u64) data); 353 break; 354 355 case PTRACE_SYSCALL: /* continue and stop at next (return from) syscall */ 356 case PTRACE_CONT: { /* restart after signal. */ 357 ret = -EIO; 358 if (!valid_signal(data)) 359 break; 360 if (request == PTRACE_SYSCALL) { 361 set_tsk_thread_flag(child, TIF_SYSCALL_TRACE); 362 } 363 else { 364 clear_tsk_thread_flag(child, TIF_SYSCALL_TRACE); 365 } 366 child->exit_code = data; 367 wake_up_process(child); 368 ret = 0; 369 break; 370 } 371 372 /* 373 * make the child exit. Best I can do is send it a sigkill. 374 * perhaps it should be put in the status that it wants to 375 * exit. 376 */ 377 case PTRACE_KILL: 378 ret = 0; 379 if (child->exit_state == EXIT_ZOMBIE) /* already dead */ 380 break; 381 child->exit_code = SIGKILL; 382 wake_up_process(child); 383 break; 384 385 case PTRACE_GET_THREAD_AREA: 386 ret = put_user(task_thread_info(child)->tp_value, 387 (unsigned int __user *) (unsigned long) data); 388 break; 389 390 case PTRACE_DETACH: /* detach a process that was attached. */ 391 ret = ptrace_detach(child, data); 392 break; 393 394 case PTRACE_GETEVENTMSG: 395 ret = put_user(child->ptrace_message, 396 (unsigned int __user *) (unsigned long) data); 397 break; 398 399 case PTRACE_GET_THREAD_AREA_3264: 400 ret = put_user(task_thread_info(child)->tp_value, 401 (unsigned long __user *) (unsigned long) data); 402 break; 403 404 default: 405 ret = ptrace_request(child, request, addr, data); 406 break; 407 } 408 409 out_tsk: 410 put_task_struct(child); 411 out: 412 unlock_kernel(); 413 return ret; 414 } 415