git.oblomov.eu Git - linux-2.6/blob - arch/mips/kernel/ptrace32.c

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