Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1 | /* |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2 | * PowerPC version |
| 3 | * Copyright (C) 1995-1996 Gary Thomas (gdt@linuxppc.org) |
| 4 | * |
| 5 | * Derived from "arch/m68k/kernel/ptrace.c" |
| 6 | * Copyright (C) 1994 by Hamish Macdonald |
| 7 | * Taken from linux/kernel/ptrace.c and modified for M680x0. |
| 8 | * linux/kernel/ptrace.c is by Ross Biro 1/23/92, edited by Linus Torvalds |
| 9 | * |
| 10 | * Modified by Cort Dougan (cort@hq.fsmlabs.com) |
Paul Mackerras | b123923 | 2005-10-20 09:11:29 +1000 | [diff] [blame] | 11 | * and Paul Mackerras (paulus@samba.org). |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 12 | * |
| 13 | * This file is subject to the terms and conditions of the GNU General |
| 14 | * Public License. See the file README.legal in the main directory of |
| 15 | * this archive for more details. |
| 16 | */ |
| 17 | |
| 18 | #include <linux/kernel.h> |
| 19 | #include <linux/sched.h> |
| 20 | #include <linux/mm.h> |
| 21 | #include <linux/smp.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 22 | #include <linux/errno.h> |
| 23 | #include <linux/ptrace.h> |
| 24 | #include <linux/user.h> |
| 25 | #include <linux/security.h> |
Jesper Juhl | 7ed20e1 | 2005-05-01 08:59:14 -0700 | [diff] [blame] | 26 | #include <linux/signal.h> |
David Woodhouse | ea9c102 | 2005-05-08 15:56:09 +0100 | [diff] [blame] | 27 | #include <linux/seccomp.h> |
| 28 | #include <linux/audit.h> |
Stephen Rothwell | e8a3030 | 2005-10-13 15:52:04 +1000 | [diff] [blame] | 29 | #ifdef CONFIG_PPC32 |
David Woodhouse | ea9c102 | 2005-05-08 15:56:09 +0100 | [diff] [blame] | 30 | #include <linux/module.h> |
Stephen Rothwell | e8a3030 | 2005-10-13 15:52:04 +1000 | [diff] [blame] | 31 | #endif |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 32 | |
| 33 | #include <asm/uaccess.h> |
| 34 | #include <asm/page.h> |
| 35 | #include <asm/pgtable.h> |
| 36 | #include <asm/system.h> |
Paul Mackerras | 21a6290 | 2005-11-19 20:47:22 +1100 | [diff] [blame] | 37 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 38 | /* |
| 39 | * does not yet catch signals sent when the child dies. |
| 40 | * in exit.c or in signal.c. |
| 41 | */ |
| 42 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 43 | /* |
Benjamin Herrenschmidt | abd0650 | 2007-06-04 15:15:47 +1000 | [diff] [blame] | 44 | * Set of msr bits that gdb can change on behalf of a process. |
| 45 | */ |
| 46 | #if defined(CONFIG_40x) || defined(CONFIG_BOOKE) |
| 47 | #define MSR_DEBUGCHANGE 0 |
| 48 | #else |
| 49 | #define MSR_DEBUGCHANGE (MSR_SE | MSR_BE) |
| 50 | #endif |
| 51 | |
| 52 | /* |
| 53 | * Max register writeable via put_reg |
| 54 | */ |
| 55 | #ifdef CONFIG_PPC32 |
| 56 | #define PT_MAX_PUT_REG PT_MQ |
| 57 | #else |
| 58 | #define PT_MAX_PUT_REG PT_CCR |
| 59 | #endif |
| 60 | |
| 61 | /* |
Benjamin Herrenschmidt | 865418d | 2007-06-04 15:15:44 +1000 | [diff] [blame] | 62 | * Get contents of register REGNO in task TASK. |
| 63 | */ |
| 64 | unsigned long ptrace_get_reg(struct task_struct *task, int regno) |
| 65 | { |
| 66 | unsigned long tmp = 0; |
| 67 | |
| 68 | if (task->thread.regs == NULL) |
| 69 | return -EIO; |
| 70 | |
| 71 | if (regno == PT_MSR) { |
| 72 | tmp = ((unsigned long *)task->thread.regs)[PT_MSR]; |
Benjamin Herrenschmidt | abd0650 | 2007-06-04 15:15:47 +1000 | [diff] [blame] | 73 | return tmp | task->thread.fpexc_mode; |
Benjamin Herrenschmidt | 865418d | 2007-06-04 15:15:44 +1000 | [diff] [blame] | 74 | } |
| 75 | |
| 76 | if (regno < (sizeof(struct pt_regs) / sizeof(unsigned long))) |
| 77 | return ((unsigned long *)task->thread.regs)[regno]; |
| 78 | |
| 79 | return -EIO; |
| 80 | } |
| 81 | |
| 82 | /* |
| 83 | * Write contents of register REGNO in task TASK. |
| 84 | */ |
| 85 | int ptrace_put_reg(struct task_struct *task, int regno, unsigned long data) |
| 86 | { |
| 87 | if (task->thread.regs == NULL) |
| 88 | return -EIO; |
| 89 | |
Benjamin Herrenschmidt | 912000e | 2007-06-04 15:15:46 +1000 | [diff] [blame] | 90 | if (regno <= PT_MAX_PUT_REG || regno == PT_TRAP) { |
Benjamin Herrenschmidt | 865418d | 2007-06-04 15:15:44 +1000 | [diff] [blame] | 91 | if (regno == PT_MSR) |
| 92 | data = (data & MSR_DEBUGCHANGE) |
| 93 | | (task->thread.regs->msr & ~MSR_DEBUGCHANGE); |
Benjamin Herrenschmidt | 912000e | 2007-06-04 15:15:46 +1000 | [diff] [blame] | 94 | /* We prevent mucking around with the reserved area of trap |
| 95 | * which are used internally by the kernel |
| 96 | */ |
| 97 | if (regno == PT_TRAP) |
| 98 | data &= 0xfff0; |
Benjamin Herrenschmidt | 865418d | 2007-06-04 15:15:44 +1000 | [diff] [blame] | 99 | ((unsigned long *)task->thread.regs)[regno] = data; |
| 100 | return 0; |
| 101 | } |
| 102 | return -EIO; |
| 103 | } |
| 104 | |
| 105 | |
| 106 | static int get_fpregs(void __user *data, struct task_struct *task, |
| 107 | int has_fpscr) |
| 108 | { |
| 109 | unsigned int count = has_fpscr ? 33 : 32; |
| 110 | |
| 111 | if (copy_to_user(data, task->thread.fpr, count * sizeof(double))) |
| 112 | return -EFAULT; |
| 113 | return 0; |
| 114 | } |
| 115 | |
| 116 | static int set_fpregs(void __user *data, struct task_struct *task, |
| 117 | int has_fpscr) |
| 118 | { |
| 119 | unsigned int count = has_fpscr ? 33 : 32; |
| 120 | |
| 121 | if (copy_from_user(task->thread.fpr, data, count * sizeof(double))) |
| 122 | return -EFAULT; |
| 123 | return 0; |
| 124 | } |
| 125 | |
| 126 | |
| 127 | #ifdef CONFIG_ALTIVEC |
| 128 | /* |
| 129 | * Get/set all the altivec registers vr0..vr31, vscr, vrsave, in one go. |
| 130 | * The transfer totals 34 quadword. Quadwords 0-31 contain the |
| 131 | * corresponding vector registers. Quadword 32 contains the vscr as the |
| 132 | * last word (offset 12) within that quadword. Quadword 33 contains the |
| 133 | * vrsave as the first word (offset 0) within the quadword. |
| 134 | * |
| 135 | * This definition of the VMX state is compatible with the current PPC32 |
| 136 | * ptrace interface. This allows signal handling and ptrace to use the |
| 137 | * same structures. This also simplifies the implementation of a bi-arch |
| 138 | * (combined (32- and 64-bit) gdb. |
| 139 | */ |
| 140 | |
| 141 | /* |
| 142 | * Get contents of AltiVec register state in task TASK |
| 143 | */ |
| 144 | static int get_vrregs(unsigned long __user *data, struct task_struct *task) |
| 145 | { |
| 146 | unsigned long regsize; |
| 147 | |
| 148 | /* copy AltiVec registers VR[0] .. VR[31] */ |
| 149 | regsize = 32 * sizeof(vector128); |
| 150 | if (copy_to_user(data, task->thread.vr, regsize)) |
| 151 | return -EFAULT; |
| 152 | data += (regsize / sizeof(unsigned long)); |
| 153 | |
| 154 | /* copy VSCR */ |
| 155 | regsize = 1 * sizeof(vector128); |
| 156 | if (copy_to_user(data, &task->thread.vscr, regsize)) |
| 157 | return -EFAULT; |
| 158 | data += (regsize / sizeof(unsigned long)); |
| 159 | |
| 160 | /* copy VRSAVE */ |
| 161 | if (put_user(task->thread.vrsave, (u32 __user *)data)) |
| 162 | return -EFAULT; |
| 163 | |
| 164 | return 0; |
| 165 | } |
| 166 | |
| 167 | /* |
| 168 | * Write contents of AltiVec register state into task TASK. |
| 169 | */ |
| 170 | static int set_vrregs(struct task_struct *task, unsigned long __user *data) |
| 171 | { |
| 172 | unsigned long regsize; |
| 173 | |
| 174 | /* copy AltiVec registers VR[0] .. VR[31] */ |
| 175 | regsize = 32 * sizeof(vector128); |
| 176 | if (copy_from_user(task->thread.vr, data, regsize)) |
| 177 | return -EFAULT; |
| 178 | data += (regsize / sizeof(unsigned long)); |
| 179 | |
| 180 | /* copy VSCR */ |
| 181 | regsize = 1 * sizeof(vector128); |
| 182 | if (copy_from_user(&task->thread.vscr, data, regsize)) |
| 183 | return -EFAULT; |
| 184 | data += (regsize / sizeof(unsigned long)); |
| 185 | |
| 186 | /* copy VRSAVE */ |
| 187 | if (get_user(task->thread.vrsave, (u32 __user *)data)) |
| 188 | return -EFAULT; |
| 189 | |
| 190 | return 0; |
| 191 | } |
| 192 | #endif /* CONFIG_ALTIVEC */ |
| 193 | |
| 194 | #ifdef CONFIG_SPE |
| 195 | |
| 196 | /* |
| 197 | * For get_evrregs/set_evrregs functions 'data' has the following layout: |
| 198 | * |
| 199 | * struct { |
| 200 | * u32 evr[32]; |
| 201 | * u64 acc; |
| 202 | * u32 spefscr; |
| 203 | * } |
| 204 | */ |
| 205 | |
| 206 | /* |
| 207 | * Get contents of SPE register state in task TASK. |
| 208 | */ |
| 209 | static int get_evrregs(unsigned long *data, struct task_struct *task) |
| 210 | { |
| 211 | int i; |
| 212 | |
| 213 | if (!access_ok(VERIFY_WRITE, data, 35 * sizeof(unsigned long))) |
| 214 | return -EFAULT; |
| 215 | |
| 216 | /* copy SPEFSCR */ |
| 217 | if (__put_user(task->thread.spefscr, &data[34])) |
| 218 | return -EFAULT; |
| 219 | |
| 220 | /* copy SPE registers EVR[0] .. EVR[31] */ |
| 221 | for (i = 0; i < 32; i++, data++) |
| 222 | if (__put_user(task->thread.evr[i], data)) |
| 223 | return -EFAULT; |
| 224 | |
| 225 | /* copy ACC */ |
| 226 | if (__put_user64(task->thread.acc, (unsigned long long *)data)) |
| 227 | return -EFAULT; |
| 228 | |
| 229 | return 0; |
| 230 | } |
| 231 | |
| 232 | /* |
| 233 | * Write contents of SPE register state into task TASK. |
| 234 | */ |
| 235 | static int set_evrregs(struct task_struct *task, unsigned long *data) |
| 236 | { |
| 237 | int i; |
| 238 | |
| 239 | if (!access_ok(VERIFY_READ, data, 35 * sizeof(unsigned long))) |
| 240 | return -EFAULT; |
| 241 | |
| 242 | /* copy SPEFSCR */ |
| 243 | if (__get_user(task->thread.spefscr, &data[34])) |
| 244 | return -EFAULT; |
| 245 | |
| 246 | /* copy SPE registers EVR[0] .. EVR[31] */ |
| 247 | for (i = 0; i < 32; i++, data++) |
| 248 | if (__get_user(task->thread.evr[i], data)) |
| 249 | return -EFAULT; |
| 250 | /* copy ACC */ |
| 251 | if (__get_user64(task->thread.acc, (unsigned long long*)data)) |
| 252 | return -EFAULT; |
| 253 | |
| 254 | return 0; |
| 255 | } |
| 256 | #endif /* CONFIG_SPE */ |
| 257 | |
| 258 | |
| 259 | static void set_single_step(struct task_struct *task) |
| 260 | { |
| 261 | struct pt_regs *regs = task->thread.regs; |
| 262 | |
| 263 | if (regs != NULL) { |
| 264 | #if defined(CONFIG_40x) || defined(CONFIG_BOOKE) |
| 265 | task->thread.dbcr0 = DBCR0_IDM | DBCR0_IC; |
| 266 | regs->msr |= MSR_DE; |
| 267 | #else |
| 268 | regs->msr |= MSR_SE; |
| 269 | #endif |
| 270 | } |
| 271 | set_tsk_thread_flag(task, TIF_SINGLESTEP); |
| 272 | } |
| 273 | |
| 274 | static void clear_single_step(struct task_struct *task) |
| 275 | { |
| 276 | struct pt_regs *regs = task->thread.regs; |
| 277 | |
| 278 | if (regs != NULL) { |
| 279 | #if defined(CONFIG_40x) || defined(CONFIG_BOOKE) |
| 280 | task->thread.dbcr0 = 0; |
| 281 | regs->msr &= ~MSR_DE; |
| 282 | #else |
| 283 | regs->msr &= ~MSR_SE; |
| 284 | #endif |
| 285 | } |
| 286 | clear_tsk_thread_flag(task, TIF_SINGLESTEP); |
| 287 | } |
| 288 | |
Benjamin Herrenschmidt | abd0650 | 2007-06-04 15:15:47 +1000 | [diff] [blame] | 289 | static int ptrace_set_debugreg(struct task_struct *task, unsigned long addr, |
| 290 | unsigned long data) |
| 291 | { |
| 292 | /* We only support one DABR and no IABRS at the moment */ |
| 293 | if (addr > 0) |
| 294 | return -EINVAL; |
| 295 | |
| 296 | /* The bottom 3 bits are flags */ |
| 297 | if ((data & ~0x7UL) >= TASK_SIZE) |
| 298 | return -EIO; |
| 299 | |
| 300 | /* Ensure translation is on */ |
| 301 | if (data && !(data & DABR_TRANSLATION)) |
| 302 | return -EIO; |
| 303 | |
| 304 | task->thread.dabr = data; |
| 305 | return 0; |
| 306 | } |
Benjamin Herrenschmidt | abd0650 | 2007-06-04 15:15:47 +1000 | [diff] [blame] | 307 | |
Benjamin Herrenschmidt | 865418d | 2007-06-04 15:15:44 +1000 | [diff] [blame] | 308 | /* |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 309 | * Called by kernel/ptrace.c when detaching.. |
| 310 | * |
| 311 | * Make sure single step bits etc are not set. |
| 312 | */ |
| 313 | void ptrace_disable(struct task_struct *child) |
| 314 | { |
| 315 | /* make sure the single step bit is not set. */ |
| 316 | clear_single_step(child); |
| 317 | } |
| 318 | |
Benjamin Herrenschmidt | e17666b | 2007-06-04 15:15:43 +1000 | [diff] [blame] | 319 | /* |
| 320 | * Here are the old "legacy" powerpc specific getregs/setregs ptrace calls, |
| 321 | * we mark them as obsolete now, they will be removed in a future version |
| 322 | */ |
| 323 | static long arch_ptrace_old(struct task_struct *child, long request, long addr, |
| 324 | long data) |
| 325 | { |
| 326 | int ret = -EPERM; |
| 327 | |
| 328 | switch(request) { |
| 329 | case PPC_PTRACE_GETREGS: { /* Get GPRs 0 - 31. */ |
| 330 | int i; |
| 331 | unsigned long *reg = &((unsigned long *)child->thread.regs)[0]; |
| 332 | unsigned long __user *tmp = (unsigned long __user *)addr; |
| 333 | |
| 334 | for (i = 0; i < 32; i++) { |
| 335 | ret = put_user(*reg, tmp); |
| 336 | if (ret) |
| 337 | break; |
| 338 | reg++; |
| 339 | tmp++; |
| 340 | } |
| 341 | break; |
| 342 | } |
| 343 | |
| 344 | case PPC_PTRACE_SETREGS: { /* Set GPRs 0 - 31. */ |
| 345 | int i; |
| 346 | unsigned long *reg = &((unsigned long *)child->thread.regs)[0]; |
| 347 | unsigned long __user *tmp = (unsigned long __user *)addr; |
| 348 | |
| 349 | for (i = 0; i < 32; i++) { |
| 350 | ret = get_user(*reg, tmp); |
| 351 | if (ret) |
| 352 | break; |
| 353 | reg++; |
| 354 | tmp++; |
| 355 | } |
| 356 | break; |
| 357 | } |
| 358 | |
| 359 | case PPC_PTRACE_GETFPREGS: { /* Get FPRs 0 - 31. */ |
| 360 | flush_fp_to_thread(child); |
| 361 | ret = get_fpregs((void __user *)addr, child, 0); |
| 362 | break; |
| 363 | } |
| 364 | |
| 365 | case PPC_PTRACE_SETFPREGS: { /* Get FPRs 0 - 31. */ |
| 366 | flush_fp_to_thread(child); |
| 367 | ret = set_fpregs((void __user *)addr, child, 0); |
| 368 | break; |
| 369 | } |
| 370 | |
| 371 | } |
| 372 | return ret; |
| 373 | } |
| 374 | |
Christoph Hellwig | 481bed4 | 2005-11-07 00:59:47 -0800 | [diff] [blame] | 375 | long arch_ptrace(struct task_struct *child, long request, long addr, long data) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 376 | { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 377 | int ret = -EPERM; |
| 378 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 379 | switch (request) { |
| 380 | /* when I and D space are separate, these will need to be fixed. */ |
| 381 | case PTRACE_PEEKTEXT: /* read word at location addr. */ |
Alexey Dobriyan | 7664732 | 2007-07-17 04:03:43 -0700 | [diff] [blame] | 382 | case PTRACE_PEEKDATA: |
| 383 | ret = generic_ptrace_peekdata(child, addr, data); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 384 | break; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 385 | |
| 386 | /* read the word at location addr in the USER area. */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 387 | case PTRACE_PEEKUSR: { |
| 388 | unsigned long index, tmp; |
| 389 | |
| 390 | ret = -EIO; |
| 391 | /* convert to index and check */ |
Stephen Rothwell | e8a3030 | 2005-10-13 15:52:04 +1000 | [diff] [blame] | 392 | #ifdef CONFIG_PPC32 |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 393 | index = (unsigned long) addr >> 2; |
Stephen Rothwell | e8a3030 | 2005-10-13 15:52:04 +1000 | [diff] [blame] | 394 | if ((addr & 3) || (index > PT_FPSCR) |
| 395 | || (child->thread.regs == NULL)) |
| 396 | #else |
| 397 | index = (unsigned long) addr >> 3; |
| 398 | if ((addr & 7) || (index > PT_FPSCR)) |
| 399 | #endif |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 400 | break; |
| 401 | |
| 402 | CHECK_FULL_REGS(child->thread.regs); |
| 403 | if (index < PT_FPR0) { |
Benjamin Herrenschmidt | 865418d | 2007-06-04 15:15:44 +1000 | [diff] [blame] | 404 | tmp = ptrace_get_reg(child, (int) index); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 405 | } else { |
Stephen Rothwell | e8a3030 | 2005-10-13 15:52:04 +1000 | [diff] [blame] | 406 | flush_fp_to_thread(child); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 407 | tmp = ((unsigned long *)child->thread.fpr)[index - PT_FPR0]; |
| 408 | } |
| 409 | ret = put_user(tmp,(unsigned long __user *) data); |
| 410 | break; |
| 411 | } |
| 412 | |
| 413 | /* If I and D space are separate, this will have to be fixed. */ |
| 414 | case PTRACE_POKETEXT: /* write the word at location addr. */ |
| 415 | case PTRACE_POKEDATA: |
Alexey Dobriyan | f284ce7 | 2007-07-17 04:03:44 -0700 | [diff] [blame^] | 416 | ret = generic_ptrace_pokedata(child, addr, data); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 417 | break; |
| 418 | |
| 419 | /* write the word at location addr in the USER area */ |
| 420 | case PTRACE_POKEUSR: { |
| 421 | unsigned long index; |
| 422 | |
| 423 | ret = -EIO; |
| 424 | /* convert to index and check */ |
Stephen Rothwell | e8a3030 | 2005-10-13 15:52:04 +1000 | [diff] [blame] | 425 | #ifdef CONFIG_PPC32 |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 426 | index = (unsigned long) addr >> 2; |
Stephen Rothwell | e8a3030 | 2005-10-13 15:52:04 +1000 | [diff] [blame] | 427 | if ((addr & 3) || (index > PT_FPSCR) |
| 428 | || (child->thread.regs == NULL)) |
| 429 | #else |
| 430 | index = (unsigned long) addr >> 3; |
| 431 | if ((addr & 7) || (index > PT_FPSCR)) |
| 432 | #endif |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 433 | break; |
| 434 | |
| 435 | CHECK_FULL_REGS(child->thread.regs); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 436 | if (index < PT_FPR0) { |
Benjamin Herrenschmidt | 865418d | 2007-06-04 15:15:44 +1000 | [diff] [blame] | 437 | ret = ptrace_put_reg(child, index, data); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 438 | } else { |
Stephen Rothwell | e8a3030 | 2005-10-13 15:52:04 +1000 | [diff] [blame] | 439 | flush_fp_to_thread(child); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 440 | ((unsigned long *)child->thread.fpr)[index - PT_FPR0] = data; |
| 441 | ret = 0; |
| 442 | } |
| 443 | break; |
| 444 | } |
| 445 | |
| 446 | case PTRACE_SYSCALL: /* continue and stop at next (return from) syscall */ |
| 447 | case PTRACE_CONT: { /* restart after signal. */ |
| 448 | ret = -EIO; |
Jesper Juhl | 7ed20e1 | 2005-05-01 08:59:14 -0700 | [diff] [blame] | 449 | if (!valid_signal(data)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 450 | break; |
Stephen Rothwell | e8a3030 | 2005-10-13 15:52:04 +1000 | [diff] [blame] | 451 | if (request == PTRACE_SYSCALL) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 452 | set_tsk_thread_flag(child, TIF_SYSCALL_TRACE); |
Stephen Rothwell | e8a3030 | 2005-10-13 15:52:04 +1000 | [diff] [blame] | 453 | else |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 454 | clear_tsk_thread_flag(child, TIF_SYSCALL_TRACE); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 455 | child->exit_code = data; |
| 456 | /* make sure the single step bit is not set. */ |
| 457 | clear_single_step(child); |
| 458 | wake_up_process(child); |
| 459 | ret = 0; |
| 460 | break; |
| 461 | } |
| 462 | |
| 463 | /* |
| 464 | * make the child exit. Best I can do is send it a sigkill. |
| 465 | * perhaps it should be put in the status that it wants to |
| 466 | * exit. |
| 467 | */ |
| 468 | case PTRACE_KILL: { |
| 469 | ret = 0; |
| 470 | if (child->exit_state == EXIT_ZOMBIE) /* already dead */ |
| 471 | break; |
| 472 | child->exit_code = SIGKILL; |
| 473 | /* make sure the single step bit is not set. */ |
| 474 | clear_single_step(child); |
| 475 | wake_up_process(child); |
| 476 | break; |
| 477 | } |
| 478 | |
| 479 | case PTRACE_SINGLESTEP: { /* set the trap flag. */ |
| 480 | ret = -EIO; |
Jesper Juhl | 7ed20e1 | 2005-05-01 08:59:14 -0700 | [diff] [blame] | 481 | if (!valid_signal(data)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 482 | break; |
| 483 | clear_tsk_thread_flag(child, TIF_SYSCALL_TRACE); |
| 484 | set_single_step(child); |
| 485 | child->exit_code = data; |
| 486 | /* give it a chance to run. */ |
| 487 | wake_up_process(child); |
| 488 | ret = 0; |
| 489 | break; |
| 490 | } |
| 491 | |
Stephen Rothwell | e8a3030 | 2005-10-13 15:52:04 +1000 | [diff] [blame] | 492 | case PTRACE_GET_DEBUGREG: { |
| 493 | ret = -EINVAL; |
| 494 | /* We only support one DABR and no IABRS at the moment */ |
| 495 | if (addr > 0) |
| 496 | break; |
| 497 | ret = put_user(child->thread.dabr, |
| 498 | (unsigned long __user *)data); |
| 499 | break; |
| 500 | } |
| 501 | |
| 502 | case PTRACE_SET_DEBUGREG: |
| 503 | ret = ptrace_set_debugreg(child, addr, data); |
| 504 | break; |
Stephen Rothwell | e8a3030 | 2005-10-13 15:52:04 +1000 | [diff] [blame] | 505 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 506 | case PTRACE_DETACH: |
| 507 | ret = ptrace_detach(child, data); |
| 508 | break; |
| 509 | |
Benjamin Herrenschmidt | e17666b | 2007-06-04 15:15:43 +1000 | [diff] [blame] | 510 | #ifdef CONFIG_PPC64 |
| 511 | case PTRACE_GETREGS64: |
| 512 | #endif |
| 513 | case PTRACE_GETREGS: { /* Get all pt_regs from the child. */ |
| 514 | int ui; |
| 515 | if (!access_ok(VERIFY_WRITE, (void __user *)data, |
| 516 | sizeof(struct pt_regs))) { |
| 517 | ret = -EIO; |
| 518 | break; |
Stephen Rothwell | e8a3030 | 2005-10-13 15:52:04 +1000 | [diff] [blame] | 519 | } |
Benjamin Herrenschmidt | e17666b | 2007-06-04 15:15:43 +1000 | [diff] [blame] | 520 | ret = 0; |
| 521 | for (ui = 0; ui < PT_REGS_COUNT; ui ++) { |
Benjamin Herrenschmidt | 865418d | 2007-06-04 15:15:44 +1000 | [diff] [blame] | 522 | ret |= __put_user(ptrace_get_reg(child, ui), |
Benjamin Herrenschmidt | e17666b | 2007-06-04 15:15:43 +1000 | [diff] [blame] | 523 | (unsigned long __user *) data); |
| 524 | data += sizeof(long); |
Stephen Rothwell | e8a3030 | 2005-10-13 15:52:04 +1000 | [diff] [blame] | 525 | } |
| 526 | break; |
| 527 | } |
| 528 | |
Benjamin Herrenschmidt | 0b3d5c4 | 2007-06-04 15:15:39 +1000 | [diff] [blame] | 529 | #ifdef CONFIG_PPC64 |
Benjamin Herrenschmidt | e17666b | 2007-06-04 15:15:43 +1000 | [diff] [blame] | 530 | case PTRACE_SETREGS64: |
| 531 | #endif |
| 532 | case PTRACE_SETREGS: { /* Set all gp regs in the child. */ |
| 533 | unsigned long tmp; |
| 534 | int ui; |
| 535 | if (!access_ok(VERIFY_READ, (void __user *)data, |
| 536 | sizeof(struct pt_regs))) { |
| 537 | ret = -EIO; |
| 538 | break; |
| 539 | } |
| 540 | ret = 0; |
| 541 | for (ui = 0; ui < PT_REGS_COUNT; ui ++) { |
| 542 | ret = __get_user(tmp, (unsigned long __user *) data); |
Stephen Rothwell | e8a3030 | 2005-10-13 15:52:04 +1000 | [diff] [blame] | 543 | if (ret) |
| 544 | break; |
Benjamin Herrenschmidt | 865418d | 2007-06-04 15:15:44 +1000 | [diff] [blame] | 545 | ptrace_put_reg(child, ui, tmp); |
Benjamin Herrenschmidt | e17666b | 2007-06-04 15:15:43 +1000 | [diff] [blame] | 546 | data += sizeof(long); |
Stephen Rothwell | e8a3030 | 2005-10-13 15:52:04 +1000 | [diff] [blame] | 547 | } |
| 548 | break; |
| 549 | } |
| 550 | |
Benjamin Herrenschmidt | e17666b | 2007-06-04 15:15:43 +1000 | [diff] [blame] | 551 | case PTRACE_GETFPREGS: { /* Get the child FPU state (FPR0...31 + FPSCR) */ |
Stephen Rothwell | e8a3030 | 2005-10-13 15:52:04 +1000 | [diff] [blame] | 552 | flush_fp_to_thread(child); |
Benjamin Herrenschmidt | e17666b | 2007-06-04 15:15:43 +1000 | [diff] [blame] | 553 | ret = get_fpregs((void __user *)data, child, 1); |
Stephen Rothwell | e8a3030 | 2005-10-13 15:52:04 +1000 | [diff] [blame] | 554 | break; |
| 555 | } |
Benjamin Herrenschmidt | e17666b | 2007-06-04 15:15:43 +1000 | [diff] [blame] | 556 | |
| 557 | case PTRACE_SETFPREGS: { /* Set the child FPU state (FPR0...31 + FPSCR) */ |
| 558 | flush_fp_to_thread(child); |
| 559 | ret = set_fpregs((void __user *)data, child, 1); |
| 560 | break; |
| 561 | } |
Stephen Rothwell | e8a3030 | 2005-10-13 15:52:04 +1000 | [diff] [blame] | 562 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 563 | #ifdef CONFIG_ALTIVEC |
| 564 | case PTRACE_GETVRREGS: |
| 565 | /* Get the child altivec register state. */ |
Stephen Rothwell | e8a3030 | 2005-10-13 15:52:04 +1000 | [diff] [blame] | 566 | flush_altivec_to_thread(child); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 567 | ret = get_vrregs((unsigned long __user *)data, child); |
| 568 | break; |
| 569 | |
| 570 | case PTRACE_SETVRREGS: |
| 571 | /* Set the child altivec register state. */ |
Stephen Rothwell | e8a3030 | 2005-10-13 15:52:04 +1000 | [diff] [blame] | 572 | flush_altivec_to_thread(child); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 573 | ret = set_vrregs(child, (unsigned long __user *)data); |
| 574 | break; |
| 575 | #endif |
| 576 | #ifdef CONFIG_SPE |
| 577 | case PTRACE_GETEVRREGS: |
| 578 | /* Get the child spe register state. */ |
| 579 | if (child->thread.regs->msr & MSR_SPE) |
| 580 | giveup_spe(child); |
| 581 | ret = get_evrregs((unsigned long __user *)data, child); |
| 582 | break; |
| 583 | |
| 584 | case PTRACE_SETEVRREGS: |
| 585 | /* Set the child spe register state. */ |
| 586 | /* this is to clear the MSR_SPE bit to force a reload |
| 587 | * of register state from memory */ |
| 588 | if (child->thread.regs->msr & MSR_SPE) |
| 589 | giveup_spe(child); |
| 590 | ret = set_evrregs(child, (unsigned long __user *)data); |
| 591 | break; |
| 592 | #endif |
| 593 | |
Benjamin Herrenschmidt | e17666b | 2007-06-04 15:15:43 +1000 | [diff] [blame] | 594 | /* Old reverse args ptrace callss */ |
| 595 | case PPC_PTRACE_GETREGS: /* Get GPRs 0 - 31. */ |
| 596 | case PPC_PTRACE_SETREGS: /* Set GPRs 0 - 31. */ |
| 597 | case PPC_PTRACE_GETFPREGS: /* Get FPRs 0 - 31. */ |
| 598 | case PPC_PTRACE_SETFPREGS: /* Get FPRs 0 - 31. */ |
| 599 | ret = arch_ptrace_old(child, request, addr, data); |
| 600 | break; |
| 601 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 602 | default: |
| 603 | ret = ptrace_request(child, request, addr, data); |
| 604 | break; |
| 605 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 606 | return ret; |
| 607 | } |
| 608 | |
David Woodhouse | ea9c102 | 2005-05-08 15:56:09 +0100 | [diff] [blame] | 609 | static void do_syscall_trace(void) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 610 | { |
David Woodhouse | ea9c102 | 2005-05-08 15:56:09 +0100 | [diff] [blame] | 611 | /* the 0x80 provides a way for the tracing parent to distinguish |
| 612 | between a syscall stop and SIGTRAP delivery */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 613 | ptrace_notify(SIGTRAP | ((current->ptrace & PT_TRACESYSGOOD) |
| 614 | ? 0x80 : 0)); |
| 615 | |
| 616 | /* |
| 617 | * this isn't the same as continuing with a signal, but it will do |
| 618 | * for normal use. strace only continues with a signal if the |
| 619 | * stopping signal is not SIGTRAP. -brl |
| 620 | */ |
| 621 | if (current->exit_code) { |
| 622 | send_sig(current->exit_code, current, 1); |
| 623 | current->exit_code = 0; |
| 624 | } |
| 625 | } |
David Woodhouse | ea9c102 | 2005-05-08 15:56:09 +0100 | [diff] [blame] | 626 | |
| 627 | void do_syscall_trace_enter(struct pt_regs *regs) |
| 628 | { |
Stephen Rothwell | e8a3030 | 2005-10-13 15:52:04 +1000 | [diff] [blame] | 629 | secure_computing(regs->gpr[0]); |
Stephen Rothwell | e8a3030 | 2005-10-13 15:52:04 +1000 | [diff] [blame] | 630 | |
David Woodhouse | ea9c102 | 2005-05-08 15:56:09 +0100 | [diff] [blame] | 631 | if (test_thread_flag(TIF_SYSCALL_TRACE) |
| 632 | && (current->ptrace & PT_PTRACED)) |
| 633 | do_syscall_trace(); |
| 634 | |
David Woodhouse | cfcd170 | 2007-01-14 09:38:18 +0800 | [diff] [blame] | 635 | if (unlikely(current->audit_context)) { |
| 636 | #ifdef CONFIG_PPC64 |
| 637 | if (!test_thread_flag(TIF_32BIT)) |
| 638 | audit_syscall_entry(AUDIT_ARCH_PPC64, |
| 639 | regs->gpr[0], |
| 640 | regs->gpr[3], regs->gpr[4], |
| 641 | regs->gpr[5], regs->gpr[6]); |
| 642 | else |
Stephen Rothwell | e8a3030 | 2005-10-13 15:52:04 +1000 | [diff] [blame] | 643 | #endif |
David Woodhouse | cfcd170 | 2007-01-14 09:38:18 +0800 | [diff] [blame] | 644 | audit_syscall_entry(AUDIT_ARCH_PPC, |
| 645 | regs->gpr[0], |
| 646 | regs->gpr[3] & 0xffffffff, |
| 647 | regs->gpr[4] & 0xffffffff, |
| 648 | regs->gpr[5] & 0xffffffff, |
| 649 | regs->gpr[6] & 0xffffffff); |
| 650 | } |
David Woodhouse | ea9c102 | 2005-05-08 15:56:09 +0100 | [diff] [blame] | 651 | } |
| 652 | |
| 653 | void do_syscall_trace_leave(struct pt_regs *regs) |
| 654 | { |
David Woodhouse | ea9c102 | 2005-05-08 15:56:09 +0100 | [diff] [blame] | 655 | if (unlikely(current->audit_context)) |
David Woodhouse | 4b9c876 | 2006-09-22 09:23:53 +0100 | [diff] [blame] | 656 | audit_syscall_exit((regs->ccr&0x10000000)?AUDITSC_FAILURE:AUDITSC_SUCCESS, |
David Woodhouse | ea9c102 | 2005-05-08 15:56:09 +0100 | [diff] [blame] | 657 | regs->result); |
| 658 | |
Stephen Rothwell | e8a3030 | 2005-10-13 15:52:04 +1000 | [diff] [blame] | 659 | if ((test_thread_flag(TIF_SYSCALL_TRACE) |
Paul Mackerras | 1bd7933 | 2006-03-08 13:24:22 +1100 | [diff] [blame] | 660 | || test_thread_flag(TIF_SINGLESTEP)) |
David Woodhouse | ea9c102 | 2005-05-08 15:56:09 +0100 | [diff] [blame] | 661 | && (current->ptrace & PT_PTRACED)) |
| 662 | do_syscall_trace(); |
| 663 | } |