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 *) (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 = (struct pt_regs *) ((unsigned long) child->thread_info + 130 THREAD_SIZE - 32 - sizeof(struct pt_regs)); 131 ret = 0; /* Default return value. */ 132 133 switch (addr) { 134 case 0 ... 31: 135 tmp = regs->regs[addr]; 136 break; 137 case FPR_BASE ... FPR_BASE + 31: 138 if (tsk_used_math(child)) { 139 fpureg_t *fregs = get_fpu_regs(child); 140 141 /* 142 * The odd registers are actually the high 143 * order bits of the values stored in the even 144 * registers - unless we're using r2k_switch.S. 145 */ 146 if (addr & 1) 147 tmp = (unsigned long) (fregs[((addr & ~1) - 32)] >> 32); 148 else 149 tmp = (unsigned long) (fregs[(addr - 32)] & 0xffffffff); 150 } else { 151 tmp = -1; /* FP not yet used */ 152 } 153 break; 154 case PC: 155 tmp = regs->cp0_epc; 156 break; 157 case CAUSE: 158 tmp = regs->cp0_cause; 159 break; 160 case BADVADDR: 161 tmp = regs->cp0_badvaddr; 162 break; 163 case MMHI: 164 tmp = regs->hi; 165 break; 166 case MMLO: 167 tmp = regs->lo; 168 break; 169 case FPC_CSR: 170 if (cpu_has_fpu) 171 tmp = child->thread.fpu.hard.fcr31; 172 else 173 tmp = child->thread.fpu.soft.fcr31; 174 break; 175 case FPC_EIR: { /* implementation / version register */ 176 unsigned int flags; 177 178 if (!cpu_has_fpu) 179 break; 180 181 preempt_disable(); 182 if (cpu_has_mipsmt) { 183 unsigned int vpflags = dvpe(); 184 flags = read_c0_status(); 185 __enable_fpu(); 186 __asm__ __volatile__("cfc1\t%0,$0": "=r" (tmp)); 187 write_c0_status(flags); 188 evpe(vpflags); 189 } else { 190 flags = read_c0_status(); 191 __enable_fpu(); 192 __asm__ __volatile__("cfc1\t%0,$0": "=r" (tmp)); 193 write_c0_status(flags); 194 } 195 preempt_enable(); 196 break; 197 } 198 case DSP_BASE ... DSP_BASE + 5: 199 if (!cpu_has_dsp) { 200 tmp = 0; 201 ret = -EIO; 202 goto out_tsk; 203 } 204 if (child->thread.dsp.used_dsp) { 205 dspreg_t *dregs = __get_dsp_regs(child); 206 tmp = (unsigned long) (dregs[addr - DSP_BASE]); 207 } else { 208 tmp = -1; /* DSP registers yet used */ 209 } 210 break; 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 *) (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 = (struct pt_regs *) ((unsigned long) child->thread_info + 267 THREAD_SIZE - 32 - sizeof(struct pt_regs)); 268 269 switch (addr) { 270 case 0 ... 31: 271 regs->regs[addr] = data; 272 break; 273 case FPR_BASE ... FPR_BASE + 31: { 274 fpureg_t *fregs = get_fpu_regs(child); 275 276 if (!tsk_used_math(child)) { 277 /* FP not yet used */ 278 memset(&child->thread.fpu.hard, ~0, 279 sizeof(child->thread.fpu.hard)); 280 child->thread.fpu.hard.fcr31 = 0; 281 } 282 /* 283 * The odd registers are actually the high order bits 284 * of the values stored in the even registers - unless 285 * we're using r2k_switch.S. 286 */ 287 if (addr & 1) { 288 fregs[(addr & ~1) - FPR_BASE] &= 0xffffffff; 289 fregs[(addr & ~1) - FPR_BASE] |= ((unsigned long long) data) << 32; 290 } else { 291 fregs[addr - FPR_BASE] &= ~0xffffffffLL; 292 /* Must cast, lest sign extension fill upper 293 bits! */ 294 fregs[addr - FPR_BASE] |= (unsigned int)data; 295 } 296 break; 297 } 298 case PC: 299 regs->cp0_epc = data; 300 break; 301 case MMHI: 302 regs->hi = data; 303 break; 304 case MMLO: 305 regs->lo = data; 306 break; 307 case FPC_CSR: 308 if (cpu_has_fpu) 309 child->thread.fpu.hard.fcr31 = data; 310 else 311 child->thread.fpu.soft.fcr31 = data; 312 break; 313 case DSP_BASE ... DSP_BASE + 5: 314 if (!cpu_has_dsp) { 315 ret = -EIO; 316 break; 317 } 318 319 dspreg_t *dregs = __get_dsp_regs(child); 320 dregs[addr - DSP_BASE] = data; 321 break; 322 case DSP_CONTROL: 323 if (!cpu_has_dsp) { 324 ret = -EIO; 325 break; 326 } 327 child->thread.dsp.dspcontrol = data; 328 break; 329 default: 330 /* The rest are not allowed. */ 331 ret = -EIO; 332 break; 333 } 334 break; 335 } 336 337 case PTRACE_GETREGS: 338 ret = ptrace_getregs (child, (__u64 __user *) (__u64) data); 339 break; 340 341 case PTRACE_SETREGS: 342 ret = ptrace_setregs (child, (__u64 __user *) (__u64) data); 343 break; 344 345 case PTRACE_GETFPREGS: 346 ret = ptrace_getfpregs (child, (__u32 __user *) (__u64) data); 347 break; 348 349 case PTRACE_SETFPREGS: 350 ret = ptrace_setfpregs (child, (__u32 __user *) (__u64) data); 351 break; 352 353 case PTRACE_SYSCALL: /* continue and stop at next (return from) syscall */ 354 case PTRACE_CONT: { /* restart after signal. */ 355 ret = -EIO; 356 if (!valid_signal(data)) 357 break; 358 if (request == PTRACE_SYSCALL) { 359 set_tsk_thread_flag(child, TIF_SYSCALL_TRACE); 360 } 361 else { 362 clear_tsk_thread_flag(child, TIF_SYSCALL_TRACE); 363 } 364 child->exit_code = data; 365 wake_up_process(child); 366 ret = 0; 367 break; 368 } 369 370 /* 371 * make the child exit. Best I can do is send it a sigkill. 372 * perhaps it should be put in the status that it wants to 373 * exit. 374 */ 375 case PTRACE_KILL: 376 ret = 0; 377 if (child->exit_state == EXIT_ZOMBIE) /* already dead */ 378 break; 379 child->exit_code = SIGKILL; 380 wake_up_process(child); 381 break; 382 383 case PTRACE_GET_THREAD_AREA: 384 ret = put_user(child->thread_info->tp_value, 385 (unsigned int __user *) (unsigned long) data); 386 break; 387 388 case PTRACE_DETACH: /* detach a process that was attached. */ 389 ret = ptrace_detach(child, data); 390 break; 391 392 case PTRACE_GETEVENTMSG: 393 ret = put_user(child->ptrace_message, 394 (unsigned int __user *) (unsigned long) data); 395 break; 396 397 case PTRACE_GET_THREAD_AREA_3264: 398 ret = put_user(child->thread_info->tp_value, 399 (unsigned long __user *) (unsigned long) data); 400 break; 401 402 default: 403 ret = ptrace_request(child, request, addr, data); 404 break; 405 } 406 407 out_tsk: 408 put_task_struct(child); 409 out: 410 unlock_kernel(); 411 return ret; 412 } 413