ia64/linux-2.6.18-xen.hg

view arch/mips/kernel/ptrace.c @ 452:c7ed6fe5dca0

kexec: dont initialise regions in reserve_memory()

There is no need to initialise efi_memmap_res and boot_param_res in
reserve_memory() for the initial xen domain as it is done in
machine_kexec_setup_resources() using values from the kexec hypercall.

Signed-off-by: Simon Horman <horms@verge.net.au>
author Keir Fraser <keir.fraser@citrix.com>
date Thu Feb 28 10:55:18 2008 +0000 (2008-02-28)
parents 831230e53067
children
line source
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/audit.h>
24 #include <linux/smp.h>
25 #include <linux/smp_lock.h>
26 #include <linux/user.h>
27 #include <linux/security.h>
28 #include <linux/signal.h>
30 #include <asm/byteorder.h>
31 #include <asm/cpu.h>
32 #include <asm/dsp.h>
33 #include <asm/fpu.h>
34 #include <asm/mipsregs.h>
35 #include <asm/mipsmtregs.h>
36 #include <asm/pgtable.h>
37 #include <asm/page.h>
38 #include <asm/system.h>
39 #include <asm/uaccess.h>
40 #include <asm/bootinfo.h>
41 #include <asm/reg.h>
43 /*
44 * Called by kernel/ptrace.c when detaching..
45 *
46 * Make sure single step bits etc are not set.
47 */
48 void ptrace_disable(struct task_struct *child)
49 {
50 /* Nothing to do.. */
51 }
53 /*
54 * Read a general register set. We always use the 64-bit format, even
55 * for 32-bit kernels and for 32-bit processes on a 64-bit kernel.
56 * Registers are sign extended to fill the available space.
57 */
58 int ptrace_getregs (struct task_struct *child, __s64 __user *data)
59 {
60 struct pt_regs *regs;
61 int i;
63 if (!access_ok(VERIFY_WRITE, data, 38 * 8))
64 return -EIO;
66 regs = task_pt_regs(child);
68 for (i = 0; i < 32; i++)
69 __put_user (regs->regs[i], data + i);
70 __put_user (regs->lo, data + EF_LO - EF_R0);
71 __put_user (regs->hi, data + EF_HI - EF_R0);
72 __put_user (regs->cp0_epc, data + EF_CP0_EPC - EF_R0);
73 __put_user (regs->cp0_badvaddr, data + EF_CP0_BADVADDR - EF_R0);
74 __put_user (regs->cp0_status, data + EF_CP0_STATUS - EF_R0);
75 __put_user (regs->cp0_cause, data + EF_CP0_CAUSE - EF_R0);
77 return 0;
78 }
80 /*
81 * Write a general register set. As for PTRACE_GETREGS, we always use
82 * the 64-bit format. On a 32-bit kernel only the lower order half
83 * (according to endianness) will be used.
84 */
85 int ptrace_setregs (struct task_struct *child, __s64 __user *data)
86 {
87 struct pt_regs *regs;
88 int i;
90 if (!access_ok(VERIFY_READ, data, 38 * 8))
91 return -EIO;
93 regs = task_pt_regs(child);
95 for (i = 0; i < 32; i++)
96 __get_user (regs->regs[i], data + i);
97 __get_user (regs->lo, data + EF_LO - EF_R0);
98 __get_user (regs->hi, data + EF_HI - EF_R0);
99 __get_user (regs->cp0_epc, data + EF_CP0_EPC - EF_R0);
101 /* badvaddr, status, and cause may not be written. */
103 return 0;
104 }
106 int ptrace_getfpregs (struct task_struct *child, __u32 __user *data)
107 {
108 int i;
110 if (!access_ok(VERIFY_WRITE, data, 33 * 8))
111 return -EIO;
113 if (tsk_used_math(child)) {
114 fpureg_t *fregs = get_fpu_regs(child);
115 for (i = 0; i < 32; i++)
116 __put_user (fregs[i], i + (__u64 __user *) data);
117 } else {
118 for (i = 0; i < 32; i++)
119 __put_user ((__u64) -1, i + (__u64 __user *) data);
120 }
122 __put_user (child->thread.fpu.fcr31, data + 64);
124 if (cpu_has_fpu) {
125 unsigned int flags, tmp;
127 preempt_disable();
128 if (cpu_has_mipsmt) {
129 unsigned int vpflags = dvpe();
130 flags = read_c0_status();
131 __enable_fpu();
132 __asm__ __volatile__("cfc1\t%0,$0" : "=r" (tmp));
133 write_c0_status(flags);
134 evpe(vpflags);
135 } else {
136 flags = read_c0_status();
137 __enable_fpu();
138 __asm__ __volatile__("cfc1\t%0,$0" : "=r" (tmp));
139 write_c0_status(flags);
140 }
141 preempt_enable();
142 __put_user (tmp, data + 65);
143 } else {
144 __put_user ((__u32) 0, data + 65);
145 }
147 return 0;
148 }
150 int ptrace_setfpregs (struct task_struct *child, __u32 __user *data)
151 {
152 fpureg_t *fregs;
153 int i;
155 if (!access_ok(VERIFY_READ, data, 33 * 8))
156 return -EIO;
158 fregs = get_fpu_regs(child);
160 for (i = 0; i < 32; i++)
161 __get_user (fregs[i], i + (__u64 __user *) data);
163 __get_user (child->thread.fpu.fcr31, data + 64);
165 /* FIR may not be written. */
167 return 0;
168 }
170 long arch_ptrace(struct task_struct *child, long request, long addr, long data)
171 {
172 int ret;
174 switch (request) {
175 /* when I and D space are separate, these will need to be fixed. */
176 case PTRACE_PEEKTEXT: /* read word at location addr. */
177 case PTRACE_PEEKDATA: {
178 unsigned long tmp;
179 int copied;
181 copied = access_process_vm(child, addr, &tmp, sizeof(tmp), 0);
182 ret = -EIO;
183 if (copied != sizeof(tmp))
184 break;
185 ret = put_user(tmp,(unsigned long __user *) data);
186 break;
187 }
189 /* Read the word at location addr in the USER area. */
190 case PTRACE_PEEKUSR: {
191 struct pt_regs *regs;
192 unsigned long tmp = 0;
194 regs = task_pt_regs(child);
195 ret = 0; /* Default return value. */
197 switch (addr) {
198 case 0 ... 31:
199 tmp = regs->regs[addr];
200 break;
201 case FPR_BASE ... FPR_BASE + 31:
202 if (tsk_used_math(child)) {
203 fpureg_t *fregs = get_fpu_regs(child);
205 #ifdef CONFIG_32BIT
206 /*
207 * The odd registers are actually the high
208 * order bits of the values stored in the even
209 * registers - unless we're using r2k_switch.S.
210 */
211 if (addr & 1)
212 tmp = (unsigned long) (fregs[((addr & ~1) - 32)] >> 32);
213 else
214 tmp = (unsigned long) (fregs[(addr - 32)] & 0xffffffff);
215 #endif
216 #ifdef CONFIG_64BIT
217 tmp = fregs[addr - FPR_BASE];
218 #endif
219 } else {
220 tmp = -1; /* FP not yet used */
221 }
222 break;
223 case PC:
224 tmp = regs->cp0_epc;
225 break;
226 case CAUSE:
227 tmp = regs->cp0_cause;
228 break;
229 case BADVADDR:
230 tmp = regs->cp0_badvaddr;
231 break;
232 case MMHI:
233 tmp = regs->hi;
234 break;
235 case MMLO:
236 tmp = regs->lo;
237 break;
238 case FPC_CSR:
239 tmp = child->thread.fpu.fcr31;
240 break;
241 case FPC_EIR: { /* implementation / version register */
242 unsigned int flags;
243 #ifdef CONFIG_MIPS_MT_SMTC
244 unsigned int irqflags;
245 unsigned int mtflags;
246 #endif /* CONFIG_MIPS_MT_SMTC */
248 if (!cpu_has_fpu)
249 break;
251 #ifdef CONFIG_MIPS_MT_SMTC
252 /* Read-modify-write of Status must be atomic */
253 local_irq_save(irqflags);
254 mtflags = dmt();
255 #endif /* CONFIG_MIPS_MT_SMTC */
257 preempt_disable();
258 if (cpu_has_mipsmt) {
259 unsigned int vpflags = dvpe();
260 flags = read_c0_status();
261 __enable_fpu();
262 __asm__ __volatile__("cfc1\t%0,$0": "=r" (tmp));
263 write_c0_status(flags);
264 evpe(vpflags);
265 } else {
266 flags = read_c0_status();
267 __enable_fpu();
268 __asm__ __volatile__("cfc1\t%0,$0": "=r" (tmp));
269 write_c0_status(flags);
270 }
271 #ifdef CONFIG_MIPS_MT_SMTC
272 emt(mtflags);
273 local_irq_restore(irqflags);
274 #endif /* CONFIG_MIPS_MT_SMTC */
275 preempt_enable();
276 break;
277 }
278 case DSP_BASE ... DSP_BASE + 5: {
279 dspreg_t *dregs;
281 if (!cpu_has_dsp) {
282 tmp = 0;
283 ret = -EIO;
284 goto out;
285 }
286 dregs = __get_dsp_regs(child);
287 tmp = (unsigned long) (dregs[addr - DSP_BASE]);
288 break;
289 }
290 case DSP_CONTROL:
291 if (!cpu_has_dsp) {
292 tmp = 0;
293 ret = -EIO;
294 goto out;
295 }
296 tmp = child->thread.dsp.dspcontrol;
297 break;
298 default:
299 tmp = 0;
300 ret = -EIO;
301 goto out;
302 }
303 ret = put_user(tmp, (unsigned long __user *) data);
304 break;
305 }
307 /* when I and D space are separate, this will have to be fixed. */
308 case PTRACE_POKETEXT: /* write the word at location addr. */
309 case PTRACE_POKEDATA:
310 ret = 0;
311 if (access_process_vm(child, addr, &data, sizeof(data), 1)
312 == sizeof(data))
313 break;
314 ret = -EIO;
315 break;
317 case PTRACE_POKEUSR: {
318 struct pt_regs *regs;
319 ret = 0;
320 regs = task_pt_regs(child);
322 switch (addr) {
323 case 0 ... 31:
324 regs->regs[addr] = data;
325 break;
326 case FPR_BASE ... FPR_BASE + 31: {
327 fpureg_t *fregs = get_fpu_regs(child);
329 if (!tsk_used_math(child)) {
330 /* FP not yet used */
331 memset(&child->thread.fpu, ~0,
332 sizeof(child->thread.fpu));
333 child->thread.fpu.fcr31 = 0;
334 }
335 #ifdef CONFIG_32BIT
336 /*
337 * The odd registers are actually the high order bits
338 * of the values stored in the even registers - unless
339 * we're using r2k_switch.S.
340 */
341 if (addr & 1) {
342 fregs[(addr & ~1) - FPR_BASE] &= 0xffffffff;
343 fregs[(addr & ~1) - FPR_BASE] |= ((unsigned long long) data) << 32;
344 } else {
345 fregs[addr - FPR_BASE] &= ~0xffffffffLL;
346 fregs[addr - FPR_BASE] |= data;
347 }
348 #endif
349 #ifdef CONFIG_64BIT
350 fregs[addr - FPR_BASE] = data;
351 #endif
352 break;
353 }
354 case PC:
355 regs->cp0_epc = data;
356 break;
357 case MMHI:
358 regs->hi = data;
359 break;
360 case MMLO:
361 regs->lo = data;
362 break;
363 case FPC_CSR:
364 child->thread.fpu.fcr31 = data;
365 break;
366 case DSP_BASE ... DSP_BASE + 5: {
367 dspreg_t *dregs;
369 if (!cpu_has_dsp) {
370 ret = -EIO;
371 break;
372 }
374 dregs = __get_dsp_regs(child);
375 dregs[addr - DSP_BASE] = data;
376 break;
377 }
378 case DSP_CONTROL:
379 if (!cpu_has_dsp) {
380 ret = -EIO;
381 break;
382 }
383 child->thread.dsp.dspcontrol = data;
384 break;
385 default:
386 /* The rest are not allowed. */
387 ret = -EIO;
388 break;
389 }
390 break;
391 }
393 case PTRACE_GETREGS:
394 ret = ptrace_getregs (child, (__u64 __user *) data);
395 break;
397 case PTRACE_SETREGS:
398 ret = ptrace_setregs (child, (__u64 __user *) data);
399 break;
401 case PTRACE_GETFPREGS:
402 ret = ptrace_getfpregs (child, (__u32 __user *) data);
403 break;
405 case PTRACE_SETFPREGS:
406 ret = ptrace_setfpregs (child, (__u32 __user *) data);
407 break;
409 case PTRACE_SYSCALL: /* continue and stop at next (return from) syscall */
410 case PTRACE_CONT: { /* restart after signal. */
411 ret = -EIO;
412 if (!valid_signal(data))
413 break;
414 if (request == PTRACE_SYSCALL) {
415 set_tsk_thread_flag(child, TIF_SYSCALL_TRACE);
416 }
417 else {
418 clear_tsk_thread_flag(child, TIF_SYSCALL_TRACE);
419 }
420 child->exit_code = data;
421 wake_up_process(child);
422 ret = 0;
423 break;
424 }
426 /*
427 * make the child exit. Best I can do is send it a sigkill.
428 * perhaps it should be put in the status that it wants to
429 * exit.
430 */
431 case PTRACE_KILL:
432 ret = 0;
433 if (child->exit_state == EXIT_ZOMBIE) /* already dead */
434 break;
435 child->exit_code = SIGKILL;
436 wake_up_process(child);
437 break;
439 case PTRACE_DETACH: /* detach a process that was attached. */
440 ret = ptrace_detach(child, data);
441 break;
443 case PTRACE_GET_THREAD_AREA:
444 ret = put_user(task_thread_info(child)->tp_value,
445 (unsigned long __user *) data);
446 break;
448 default:
449 ret = ptrace_request(child, request, addr, data);
450 break;
451 }
452 out:
453 return ret;
454 }
456 static inline int audit_arch(void)
457 {
458 int arch = EM_MIPS;
459 #ifdef CONFIG_64BIT
460 arch |= __AUDIT_ARCH_64BIT;
461 #endif
462 #if defined(__LITTLE_ENDIAN)
463 arch |= __AUDIT_ARCH_LE;
464 #endif
465 return arch;
466 }
468 /*
469 * Notification of system call entry/exit
470 * - triggered by current->work.syscall_trace
471 */
472 asmlinkage void do_syscall_trace(struct pt_regs *regs, int entryexit)
473 {
474 if (unlikely(current->audit_context) && entryexit)
475 audit_syscall_exit(AUDITSC_RESULT(regs->regs[2]),
476 regs->regs[2]);
478 if (!(current->ptrace & PT_PTRACED))
479 goto out;
480 if (!test_thread_flag(TIF_SYSCALL_TRACE))
481 goto out;
483 /* The 0x80 provides a way for the tracing parent to distinguish
484 between a syscall stop and SIGTRAP delivery */
485 ptrace_notify(SIGTRAP | ((current->ptrace & PT_TRACESYSGOOD) ?
486 0x80 : 0));
488 /*
489 * this isn't the same as continuing with a signal, but it will do
490 * for normal use. strace only continues with a signal if the
491 * stopping signal is not SIGTRAP. -brl
492 */
493 if (current->exit_code) {
494 send_sig(current->exit_code, current, 1);
495 current->exit_code = 0;
496 }
497 out:
498 if (unlikely(current->audit_context) && !entryexit)
499 audit_syscall_entry(audit_arch(), regs->regs[2],
500 regs->regs[4], regs->regs[5],
501 regs->regs[6], regs->regs[7]);
502 }