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13#include <linux/kernel.h>
14#include <linux/sched.h>
15#include <linux/mm.h>
16#include <linux/smp.h>
17#include <linux/errno.h>
18#include <linux/ptrace.h>
19#include <linux/user.h>
20#include <linux/signal.h>
21
22#include <asm/uaccess.h>
23#include <asm/page.h>
24#include <asm/pgtable.h>
25#include <asm/system.h>
26#include <asm/processor.h>
27
28
29
30
31
32
33
34
35#define SR_MASK 0x001f
36
37
38#define TRACE_BITS 0x8000
39
40
41#define PT_REG(reg) ((long)&((struct pt_regs *)0)->reg)
42#define SW_REG(reg) ((long)&((struct switch_stack *)0)->reg \
43 - sizeof(struct switch_stack))
44
45
46
47static int regoff[] = {
48 PT_REG(d1), PT_REG(d2), PT_REG(d3), PT_REG(d4),
49 PT_REG(d5), SW_REG(d6), SW_REG(d7), PT_REG(a0),
50 PT_REG(a1), PT_REG(a2), SW_REG(a3), SW_REG(a4),
51 SW_REG(a5), SW_REG(a6), PT_REG(d0), -1,
52 PT_REG(orig_d0), PT_REG(sr), PT_REG(pc),
53};
54
55
56
57
58static inline long get_reg(struct task_struct *task, int regno)
59{
60 unsigned long *addr;
61
62 if (regno == PT_USP)
63 addr = &task->thread.usp;
64 else if (regno < ARRAY_SIZE(regoff))
65 addr = (unsigned long *)(task->thread.esp0 + regoff[regno]);
66 else
67 return 0;
68 return *addr;
69}
70
71
72
73
74static inline int put_reg(struct task_struct *task, int regno,
75 unsigned long data)
76{
77 unsigned long *addr;
78
79 if (regno == PT_USP)
80 addr = &task->thread.usp;
81 else if (regno < ARRAY_SIZE(regoff))
82 addr = (unsigned long *) (task->thread.esp0 + regoff[regno]);
83 else
84 return -1;
85 *addr = data;
86 return 0;
87}
88
89
90
91
92
93
94void ptrace_disable(struct task_struct *child)
95{
96 unsigned long tmp;
97
98 tmp = get_reg(child, PT_SR) & ~(TRACE_BITS << 16);
99 put_reg(child, PT_SR, tmp);
100}
101
102long arch_ptrace(struct task_struct *child, long request, long addr, long data)
103{
104 int ret;
105
106 switch (request) {
107
108 case PTRACE_PEEKTEXT:
109 case PTRACE_PEEKDATA:
110 ret = generic_ptrace_peekdata(child, addr, data);
111 break;
112
113
114 case PTRACE_PEEKUSR: {
115 unsigned long tmp;
116
117 ret = -EIO;
118 if ((addr & 3) || addr < 0 ||
119 addr > sizeof(struct user) - 3)
120 break;
121
122 tmp = 0;
123 addr = addr >> 2;
124 ret = -EIO;
125 if (addr < 19) {
126 tmp = get_reg(child, addr);
127 if (addr == PT_SR)
128 tmp >>= 16;
129 } else if (addr >= 21 && addr < 49) {
130 tmp = child->thread.fp[addr - 21];
131#ifdef CONFIG_M68KFPU_EMU
132
133
134
135 if (FPU_IS_EMU && (addr < 45) && !(addr % 3))
136 tmp = ((tmp & 0xffff0000) << 15) |
137 ((tmp & 0x0000ffff) << 16);
138#endif
139 } else if (addr == 49) {
140 tmp = child->mm->start_code;
141 } else if (addr == 50) {
142 tmp = child->mm->start_data;
143 } else if (addr == 51) {
144 tmp = child->mm->end_code;
145 } else
146 break;
147 ret = put_user(tmp,(unsigned long *) data);
148 break;
149 }
150
151
152 case PTRACE_POKETEXT:
153 case PTRACE_POKEDATA:
154 ret = generic_ptrace_pokedata(child, addr, data);
155 break;
156
157 case PTRACE_POKEUSR:
158 ret = -EIO;
159 if ((addr & 3) || addr < 0 ||
160 addr > sizeof(struct user) - 3)
161 break;
162
163 addr = addr >> 2;
164
165 if (addr == PT_SR) {
166 data &= SR_MASK;
167 data <<= 16;
168 data |= get_reg(child, PT_SR) & ~(SR_MASK << 16);
169 }
170 if (addr < 19) {
171 if (put_reg(child, addr, data))
172 break;
173 ret = 0;
174 break;
175 }
176 if (addr >= 21 && addr < 48)
177 {
178#ifdef CONFIG_M68KFPU_EMU
179
180
181
182 if (FPU_IS_EMU && (addr < 45) && !(addr % 3)) {
183 data = (unsigned long)data << 15;
184 data = (data & 0xffff0000) |
185 ((data & 0x0000ffff) >> 1);
186 }
187#endif
188 child->thread.fp[addr - 21] = data;
189 ret = 0;
190 }
191 break;
192
193 case PTRACE_SYSCALL:
194 case PTRACE_CONT: {
195 long tmp;
196
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
206 tmp = get_reg(child, PT_SR) & ~(TRACE_BITS << 16);
207 put_reg(child, PT_SR, tmp);
208 wake_up_process(child);
209 ret = 0;
210 break;
211 }
212
213
214
215
216
217
218 case PTRACE_KILL: {
219 long tmp;
220
221 ret = 0;
222 if (child->exit_state == EXIT_ZOMBIE)
223 break;
224 child->exit_code = SIGKILL;
225
226 tmp = get_reg(child, PT_SR) & ~(TRACE_BITS << 16);
227 put_reg(child, PT_SR, tmp);
228 wake_up_process(child);
229 break;
230 }
231
232 case PTRACE_SINGLESTEP: {
233 long tmp;
234
235 ret = -EIO;
236 if (!valid_signal(data))
237 break;
238 clear_tsk_thread_flag(child, TIF_SYSCALL_TRACE);
239 tmp = get_reg(child, PT_SR) | (TRACE_BITS << 16);
240 put_reg(child, PT_SR, tmp);
241
242 child->exit_code = data;
243
244 wake_up_process(child);
245 ret = 0;
246 break;
247 }
248
249 case PTRACE_DETACH:
250 ret = ptrace_detach(child, data);
251 break;
252
253 case PTRACE_GETREGS: {
254 int i;
255 unsigned long tmp;
256 for (i = 0; i < 19; i++) {
257 tmp = get_reg(child, i);
258 if (i == PT_SR)
259 tmp >>= 16;
260 if (put_user(tmp, (unsigned long *) data)) {
261 ret = -EFAULT;
262 break;
263 }
264 data += sizeof(long);
265 }
266 ret = 0;
267 break;
268 }
269
270 case PTRACE_SETREGS: {
271 int i;
272 unsigned long tmp;
273 for (i = 0; i < 19; i++) {
274 if (get_user(tmp, (unsigned long *) data)) {
275 ret = -EFAULT;
276 break;
277 }
278 if (i == PT_SR) {
279 tmp &= SR_MASK;
280 tmp <<= 16;
281 tmp |= get_reg(child, PT_SR) & ~(SR_MASK << 16);
282 }
283 put_reg(child, i, tmp);
284 data += sizeof(long);
285 }
286 ret = 0;
287 break;
288 }
289
290#ifdef PTRACE_GETFPREGS
291 case PTRACE_GETFPREGS: {
292 ret = 0;
293 if (copy_to_user((void *)data, &child->thread.fp,
294 sizeof(struct user_m68kfp_struct)))
295 ret = -EFAULT;
296 break;
297 }
298#endif
299
300#ifdef PTRACE_SETFPREGS
301 case PTRACE_SETFPREGS: {
302 ret = 0;
303 if (copy_from_user(&child->thread.fp, (void *)data,
304 sizeof(struct user_m68kfp_struct)))
305 ret = -EFAULT;
306 break;
307 }
308#endif
309
310 default:
311 ret = -EIO;
312 break;
313 }
314 return ret;
315}
316
317asmlinkage void syscall_trace(void)
318{
319 if (!test_thread_flag(TIF_SYSCALL_TRACE))
320 return;
321 if (!(current->ptrace & PT_PTRACED))
322 return;
323 ptrace_notify(SIGTRAP | ((current->ptrace & PT_TRACESYSGOOD)
324 ? 0x80 : 0));
325
326
327
328
329
330 if (current->exit_code) {
331 send_sig(current->exit_code, current, 1);
332 current->exit_code = 0;
333 }
334}
335