ia64/linux-2.6.18-xen.hg

view arch/mips/kernel/ptrace32.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/smp.h>
24 #include <linux/smp_lock.h>
25 #include <linux/user.h>
26 #include <linux/security.h>
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>
39 int ptrace_getregs (struct task_struct *child, __s64 __user *data);
40 int ptrace_setregs (struct task_struct *child, __s64 __user *data);
42 int ptrace_getfpregs (struct task_struct *child, __u32 __user *data);
43 int ptrace_setfpregs (struct task_struct *child, __u32 __user *data);
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;
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 }
65 child = ptrace_get_task_struct(pid);
66 if (IS_ERR(child)) {
67 ret = PTR_ERR(child);
68 goto out;
69 }
71 if (request == PTRACE_ATTACH) {
72 ret = ptrace_attach(child);
73 goto out_tsk;
74 }
76 ret = ptrace_check_attach(child, request == PTRACE_KILL);
77 if (ret < 0)
78 goto out_tsk;
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;
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 }
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;
110 ret = -EIO;
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;
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 }
124 /* Read the word at location addr in the USER area. */
125 case PTRACE_PEEKUSR: {
126 struct pt_regs *regs;
127 unsigned int tmp;
129 regs = task_pt_regs(child);
130 ret = 0; /* Default return value. */
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);
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 */
178 if (!cpu_has_fpu) {
179 tmp = 0;
180 break;
181 }
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 */
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;
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 }
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;
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;
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 }
274 case PTRACE_POKEUSR: {
275 struct pt_regs *regs;
276 ret = 0;
277 regs = task_pt_regs(child);
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);
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;
323 if (!cpu_has_dsp) {
324 ret = -EIO;
325 break;
326 }
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 }
347 case PTRACE_GETREGS:
348 ret = ptrace_getregs (child, (__u64 __user *) (__u64) data);
349 break;
351 case PTRACE_SETREGS:
352 ret = ptrace_setregs (child, (__u64 __user *) (__u64) data);
353 break;
355 case PTRACE_GETFPREGS:
356 ret = ptrace_getfpregs (child, (__u32 __user *) (__u64) data);
357 break;
359 case PTRACE_SETFPREGS:
360 ret = ptrace_setfpregs (child, (__u32 __user *) (__u64) data);
361 break;
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 }
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;
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;
398 case PTRACE_DETACH: /* detach a process that was attached. */
399 ret = ptrace_detach(child, data);
400 break;
402 case PTRACE_GETEVENTMSG:
403 ret = put_user(child->ptrace_message,
404 (unsigned int __user *) (unsigned long) data);
405 break;
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;
412 default:
413 ret = ptrace_request(child, request, addr, data);
414 break;
415 }
417 out_tsk:
418 put_task_struct(child);
419 out:
420 unlock_kernel();
421 return ret;
422 }