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-rw-r--r--arch/sh/kernel/ptrace_64.c332
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diff --git a/arch/sh/kernel/ptrace_64.c b/arch/sh/kernel/ptrace_64.c
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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 * arch/sh64/kernel/ptrace.c
7 *
8 * Copyright (C) 2000, 2001 Paolo Alberelli
9 * Copyright (C) 2003 Paul Mundt
10 *
11 * Started from SH3/4 version:
12 * SuperH version: Copyright (C) 1999, 2000 Kaz Kojima & Niibe Yutaka
13 *
14 * Original x86 implementation:
15 * By Ross Biro 1/23/92
16 * edited by Linus Torvalds
17 *
18 */
19
20#include <linux/kernel.h>
21#include <linux/rwsem.h>
22#include <linux/sched.h>
23#include <linux/mm.h>
24#include <linux/smp.h>
25#include <linux/smp_lock.h>
26#include <linux/errno.h>
27#include <linux/ptrace.h>
28#include <linux/user.h>
29#include <linux/signal.h>
30#include <linux/syscalls.h>
31
32#include <asm/io.h>
33#include <asm/uaccess.h>
34#include <asm/pgtable.h>
35#include <asm/system.h>
36#include <asm/processor.h>
37#include <asm/mmu_context.h>
38
39/* This mask defines the bits of the SR which the user is not allowed to
40 change, which are everything except S, Q, M, PR, SZ, FR. */
41#define SR_MASK (0xffff8cfd)
42
43/*
44 * does not yet catch signals sent when the child dies.
45 * in exit.c or in signal.c.
46 */
47
48/*
49 * This routine will get a word from the user area in the process kernel stack.
50 */
51static inline int get_stack_long(struct task_struct *task, int offset)
52{
53 unsigned char *stack;
54
55 stack = (unsigned char *)(task->thread.uregs);
56 stack += offset;
57 return (*((int *)stack));
58}
59
60static inline unsigned long
61get_fpu_long(struct task_struct *task, unsigned long addr)
62{
63 unsigned long tmp;
64 struct pt_regs *regs;
65 regs = (struct pt_regs*)((unsigned char *)task + THREAD_SIZE) - 1;
66
67 if (!tsk_used_math(task)) {
68 if (addr == offsetof(struct user_fpu_struct, fpscr)) {
69 tmp = FPSCR_INIT;
70 } else {
71 tmp = 0xffffffffUL; /* matches initial value in fpu.c */
72 }
73 return tmp;
74 }
75
76 if (last_task_used_math == task) {
77 grab_fpu();
78 fpsave(&task->thread.fpu.hard);
79 release_fpu();
80 last_task_used_math = 0;
81 regs->sr |= SR_FD;
82 }
83
84 tmp = ((long *)&task->thread.fpu)[addr / sizeof(unsigned long)];
85 return tmp;
86}
87
88/*
89 * This routine will put a word into the user area in the process kernel stack.
90 */
91static inline int put_stack_long(struct task_struct *task, int offset,
92 unsigned long data)
93{
94 unsigned char *stack;
95
96 stack = (unsigned char *)(task->thread.uregs);
97 stack += offset;
98 *(unsigned long *) stack = data;
99 return 0;
100}
101
102static inline int
103put_fpu_long(struct task_struct *task, unsigned long addr, unsigned long data)
104{
105 struct pt_regs *regs;
106
107 regs = (struct pt_regs*)((unsigned char *)task + THREAD_SIZE) - 1;
108
109 if (!tsk_used_math(task)) {
110 fpinit(&task->thread.fpu.hard);
111 set_stopped_child_used_math(task);
112 } else if (last_task_used_math == task) {
113 grab_fpu();
114 fpsave(&task->thread.fpu.hard);
115 release_fpu();
116 last_task_used_math = 0;
117 regs->sr |= SR_FD;
118 }
119
120 ((long *)&task->thread.fpu)[addr / sizeof(unsigned long)] = data;
121 return 0;
122}
123
124
125long arch_ptrace(struct task_struct *child, long request, long addr, long data)
126{
127 int ret;
128
129 switch (request) {
130 /* when I and D space are separate, these will need to be fixed. */
131 case PTRACE_PEEKTEXT: /* read word at location addr. */
132 case PTRACE_PEEKDATA:
133 ret = generic_ptrace_peekdata(child, addr, data);
134 break;
135
136 /* read the word at location addr in the USER area. */
137 case PTRACE_PEEKUSR: {
138 unsigned long tmp;
139
140 ret = -EIO;
141 if ((addr & 3) || addr < 0)
142 break;
143
144 if (addr < sizeof(struct pt_regs))
145 tmp = get_stack_long(child, addr);
146 else if ((addr >= offsetof(struct user, fpu)) &&
147 (addr < offsetof(struct user, u_fpvalid))) {
148 tmp = get_fpu_long(child, addr - offsetof(struct user, fpu));
149 } else if (addr == offsetof(struct user, u_fpvalid)) {
150 tmp = !!tsk_used_math(child);
151 } else {
152 break;
153 }
154 ret = put_user(tmp, (unsigned long *)data);
155 break;
156 }
157
158 /* when I and D space are separate, this will have to be fixed. */
159 case PTRACE_POKETEXT: /* write the word at location addr. */
160 case PTRACE_POKEDATA:
161 ret = generic_ptrace_pokedata(child, addr, data);
162 break;
163
164 case PTRACE_POKEUSR:
165 /* write the word at location addr in the USER area. We must
166 disallow any changes to certain SR bits or u_fpvalid, since
167 this could crash the kernel or result in a security
168 loophole. */
169 ret = -EIO;
170 if ((addr & 3) || addr < 0)
171 break;
172
173 if (addr < sizeof(struct pt_regs)) {
174 /* Ignore change of top 32 bits of SR */
175 if (addr == offsetof (struct pt_regs, sr)+4)
176 {
177 ret = 0;
178 break;
179 }
180 /* If lower 32 bits of SR, ignore non-user bits */
181 if (addr == offsetof (struct pt_regs, sr))
182 {
183 long cursr = get_stack_long(child, addr);
184 data &= ~(SR_MASK);
185 data |= (cursr & SR_MASK);
186 }
187 ret = put_stack_long(child, addr, data);
188 }
189 else if ((addr >= offsetof(struct user, fpu)) &&
190 (addr < offsetof(struct user, u_fpvalid))) {
191 ret = put_fpu_long(child, addr - offsetof(struct user, fpu), data);
192 }
193 break;
194
195 case PTRACE_SYSCALL: /* continue and stop at next (return from) syscall */
196 case PTRACE_CONT: { /* restart after signal. */
197 ret = -EIO;
198 if (!valid_signal(data))
199 break;
200 if (request == PTRACE_SYSCALL)
201 set_tsk_thread_flag(child, TIF_SYSCALL_TRACE);
202 else
203 clear_tsk_thread_flag(child, TIF_SYSCALL_TRACE);
204 child->exit_code = data;
205 wake_up_process(child);
206 ret = 0;
207 break;
208 }
209
210/*
211 * make the child exit. Best I can do is send it a sigkill.
212 * perhaps it should be put in the status that it wants to
213 * exit.
214 */
215 case PTRACE_KILL: {
216 ret = 0;
217 if (child->exit_state == EXIT_ZOMBIE) /* already dead */
218 break;
219 child->exit_code = SIGKILL;
220 wake_up_process(child);
221 break;
222 }
223
224 case PTRACE_SINGLESTEP: { /* set the trap flag. */
225 struct pt_regs *regs;
226
227 ret = -EIO;
228 if (!valid_signal(data))
229 break;
230 clear_tsk_thread_flag(child, TIF_SYSCALL_TRACE);
231 if ((child->ptrace & PT_DTRACE) == 0) {
232 /* Spurious delayed TF traps may occur */
233 child->ptrace |= PT_DTRACE;
234 }
235
236 regs = child->thread.uregs;
237
238 regs->sr |= SR_SSTEP; /* auto-resetting upon exception */
239
240 child->exit_code = data;
241 /* give it a chance to run. */
242 wake_up_process(child);
243 ret = 0;
244 break;
245 }
246
247 default:
248 ret = ptrace_request(child, request, addr, data);
249 break;
250 }
251 return ret;
252}
253
254asmlinkage int sh64_ptrace(long request, long pid, long addr, long data)
255{
256 extern void poke_real_address_q(unsigned long long addr, unsigned long long data);
257#define WPC_DBRMODE 0x0d104008
258 static int first_call = 1;
259
260 lock_kernel();
261 if (first_call) {
262 /* Set WPC.DBRMODE to 0. This makes all debug events get
263 * delivered through RESVEC, i.e. into the handlers in entry.S.
264 * (If the kernel was downloaded using a remote gdb, WPC.DBRMODE
265 * would normally be left set to 1, which makes debug events get
266 * delivered through DBRVEC, i.e. into the remote gdb's
267 * handlers. This prevents ptrace getting them, and confuses
268 * the remote gdb.) */
269 printk("DBRMODE set to 0 to permit native debugging\n");
270 poke_real_address_q(WPC_DBRMODE, 0);
271 first_call = 0;
272 }
273 unlock_kernel();
274
275 return sys_ptrace(request, pid, addr, data);
276}
277
278asmlinkage void syscall_trace(void)
279{
280 struct task_struct *tsk = current;
281
282 if (!test_thread_flag(TIF_SYSCALL_TRACE))
283 return;
284 if (!(tsk->ptrace & PT_PTRACED))
285 return;
286
287 ptrace_notify(SIGTRAP | ((current->ptrace & PT_TRACESYSGOOD)
288 ? 0x80 : 0));
289 /*
290 * this isn't the same as continuing with a signal, but it will do
291 * for normal use. strace only continues with a signal if the
292 * stopping signal is not SIGTRAP. -brl
293 */
294 if (tsk->exit_code) {
295 send_sig(tsk->exit_code, tsk, 1);
296 tsk->exit_code = 0;
297 }
298}
299
300/* Called with interrupts disabled */
301asmlinkage void do_single_step(unsigned long long vec, struct pt_regs *regs)
302{
303 /* This is called after a single step exception (DEBUGSS).
304 There is no need to change the PC, as it is a post-execution
305 exception, as entry.S does not do anything to the PC for DEBUGSS.
306 We need to clear the Single Step setting in SR to avoid
307 continually stepping. */
308 local_irq_enable();
309 regs->sr &= ~SR_SSTEP;
310 force_sig(SIGTRAP, current);
311}
312
313/* Called with interrupts disabled */
314asmlinkage void do_software_break_point(unsigned long long vec,
315 struct pt_regs *regs)
316{
317 /* We need to forward step the PC, to counteract the backstep done
318 in signal.c. */
319 local_irq_enable();
320 force_sig(SIGTRAP, current);
321 regs->pc += 4;
322}
323
324/*
325 * Called by kernel/ptrace.c when detaching..
326 *
327 * Make sure single step bits etc are not set.
328 */
329void ptrace_disable(struct task_struct *child)
330{
331 /* nothing to do.. */
332}
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