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