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 tmp = child->thread.fpu.fcr31; 170 break; 171 case FPC_EIR: { /* implementation / version register */ 172 unsigned int flags; 173 #ifdef CONFIG_MIPS_MT_SMTC 174 unsigned int irqflags; 175 unsigned int mtflags; 176 #endif /* CONFIG_MIPS_MT_SMTC */ 177 178 preempt_disable(); 179 if (!cpu_has_fpu) { 180 preempt_enable(); 181 tmp = 0; 182 break; 183 } 184 185 #ifdef CONFIG_MIPS_MT_SMTC 186 /* Read-modify-write of Status must be atomic */ 187 local_irq_save(irqflags); 188 mtflags = dmt(); 189 #endif /* CONFIG_MIPS_MT_SMTC */ 190 191 if (cpu_has_mipsmt) { 192 unsigned int vpflags = dvpe(); 193 flags = read_c0_status(); 194 __enable_fpu(); 195 __asm__ __volatile__("cfc1\t%0,$0": "=r" (tmp)); 196 write_c0_status(flags); 197 evpe(vpflags); 198 } else { 199 flags = read_c0_status(); 200 __enable_fpu(); 201 __asm__ __volatile__("cfc1\t%0,$0": "=r" (tmp)); 202 write_c0_status(flags); 203 } 204 #ifdef CONFIG_MIPS_MT_SMTC 205 emt(mtflags); 206 local_irq_restore(irqflags); 207 #endif /* CONFIG_MIPS_MT_SMTC */ 208 preempt_enable(); 209 break; 210 } 211 case DSP_BASE ... DSP_BASE + 5: { 212 dspreg_t *dregs; 213 214 if (!cpu_has_dsp) { 215 tmp = 0; 216 ret = -EIO; 217 goto out_tsk; 218 } 219 dregs = __get_dsp_regs(child); 220 tmp = (unsigned long) (dregs[addr - DSP_BASE]); 221 break; 222 } 223 case DSP_CONTROL: 224 if (!cpu_has_dsp) { 225 tmp = 0; 226 ret = -EIO; 227 goto out_tsk; 228 } 229 tmp = child->thread.dsp.dspcontrol; 230 break; 231 default: 232 tmp = 0; 233 ret = -EIO; 234 goto out_tsk; 235 } 236 ret = put_user(tmp, (unsigned __user *) (unsigned long) data); 237 break; 238 } 239 240 /* when I and D space are separate, this will have to be fixed. */ 241 case PTRACE_POKETEXT: /* write the word at location addr. */ 242 case PTRACE_POKEDATA: 243 ret = 0; 244 if (access_process_vm(child, addr, &data, sizeof(data), 1) 245 == sizeof(data)) 246 break; 247 ret = -EIO; 248 break; 249 250 /* 251 * Write 4 bytes into the other process' storage 252 * data is the 4 bytes that the user wants written 253 * addr is a pointer in the user's storage that contains an 254 * 8 byte address in the other process where the 4 bytes 255 * that is to be written 256 * (this is run in a 32-bit process looking at a 64-bit process) 257 * when I and D space are separate, these will need to be fixed. 258 */ 259 case PTRACE_POKETEXT_3264: 260 case PTRACE_POKEDATA_3264: { 261 u32 __user * addrOthers; 262 263 /* Get the addr in the other process that we want to write into */ 264 ret = -EIO; 265 if (get_user(addrOthers, (u32 __user * __user *) (unsigned long) addr) != 0) 266 break; 267 ret = 0; 268 if (access_process_vm(child, (u64)addrOthers, &data, 269 sizeof(data), 1) == sizeof(data)) 270 break; 271 ret = -EIO; 272 break; 273 } 274 275 case PTRACE_POKEUSR: { 276 struct pt_regs *regs; 277 ret = 0; 278 regs = task_pt_regs(child); 279 280 switch (addr) { 281 case 0 ... 31: 282 regs->regs[addr] = data; 283 break; 284 case FPR_BASE ... FPR_BASE + 31: { 285 fpureg_t *fregs = get_fpu_regs(child); 286 287 if (!tsk_used_math(child)) { 288 /* FP not yet used */ 289 memset(&child->thread.fpu, ~0, 290 sizeof(child->thread.fpu)); 291 child->thread.fpu.fcr31 = 0; 292 } 293 /* 294 * The odd registers are actually the high order bits 295 * of the values stored in the even registers - unless 296 * we're using r2k_switch.S. 297 */ 298 if (addr & 1) { 299 fregs[(addr & ~1) - FPR_BASE] &= 0xffffffff; 300 fregs[(addr & ~1) - FPR_BASE] |= ((unsigned long long) data) << 32; 301 } else { 302 fregs[addr - FPR_BASE] &= ~0xffffffffLL; 303 /* Must cast, lest sign extension fill upper 304 bits! */ 305 fregs[addr - FPR_BASE] |= (unsigned int)data; 306 } 307 break; 308 } 309 case PC: 310 regs->cp0_epc = data; 311 break; 312 case MMHI: 313 regs->hi = data; 314 break; 315 case MMLO: 316 regs->lo = data; 317 break; 318 case FPC_CSR: 319 child->thread.fpu.fcr31 = data; 320 break; 321 case DSP_BASE ... DSP_BASE + 5: { 322 dspreg_t *dregs; 323 324 if (!cpu_has_dsp) { 325 ret = -EIO; 326 break; 327 } 328 329 dregs = __get_dsp_regs(child); 330 dregs[addr - DSP_BASE] = data; 331 break; 332 } 333 case DSP_CONTROL: 334 if (!cpu_has_dsp) { 335 ret = -EIO; 336 break; 337 } 338 child->thread.dsp.dspcontrol = data; 339 break; 340 default: 341 /* The rest are not allowed. */ 342 ret = -EIO; 343 break; 344 } 345 break; 346 } 347 348 case PTRACE_GETREGS: 349 ret = ptrace_getregs(child, (__s64 __user *) (__u64) data); 350 break; 351 352 case PTRACE_SETREGS: 353 ret = ptrace_setregs(child, (__s64 __user *) (__u64) data); 354 break; 355 356 case PTRACE_GETFPREGS: 357 ret = ptrace_getfpregs(child, (__u32 __user *) (__u64) data); 358 break; 359 360 case PTRACE_SETFPREGS: 361 ret = ptrace_setfpregs(child, (__u32 __user *) (__u64) data); 362 break; 363 364 case PTRACE_SYSCALL: /* continue and stop at next (return from) syscall */ 365 case PTRACE_CONT: { /* restart after signal. */ 366 ret = -EIO; 367 if (!valid_signal(data)) 368 break; 369 if (request == PTRACE_SYSCALL) { 370 set_tsk_thread_flag(child, TIF_SYSCALL_TRACE); 371 } 372 else { 373 clear_tsk_thread_flag(child, TIF_SYSCALL_TRACE); 374 } 375 child->exit_code = data; 376 wake_up_process(child); 377 ret = 0; 378 break; 379 } 380 381 /* 382 * make the child exit. Best I can do is send it a sigkill. 383 * perhaps it should be put in the status that it wants to 384 * exit. 385 */ 386 case PTRACE_KILL: 387 ret = 0; 388 if (child->exit_state == EXIT_ZOMBIE) /* already dead */ 389 break; 390 child->exit_code = SIGKILL; 391 wake_up_process(child); 392 break; 393 394 case PTRACE_GET_THREAD_AREA: 395 ret = put_user(task_thread_info(child)->tp_value, 396 (unsigned int __user *) (unsigned long) data); 397 break; 398 399 case PTRACE_DETACH: /* detach a process that was attached. */ 400 ret = ptrace_detach(child, data); 401 break; 402 403 case PTRACE_GETEVENTMSG: 404 ret = put_user(child->ptrace_message, 405 (unsigned int __user *) (unsigned long) data); 406 break; 407 408 case PTRACE_GET_THREAD_AREA_3264: 409 ret = put_user(task_thread_info(child)->tp_value, 410 (unsigned long __user *) (unsigned long) data); 411 break; 412 413 default: 414 ret = ptrace_request(child, request, addr, data); 415 break; 416 } 417 418 out_tsk: 419 put_task_struct(child); 420 out: 421 unlock_kernel(); 422 return ret; 423 } 424