aboutsummaryrefslogtreecommitdiffstats
path: root/arch/m68k/kernel/ptrace.c
diff options
context:
space:
mode:
Diffstat (limited to 'arch/m68k/kernel/ptrace.c')
-rw-r--r--arch/m68k/kernel/ptrace.c370
1 files changed, 161 insertions, 209 deletions
diff --git a/arch/m68k/kernel/ptrace.c b/arch/m68k/kernel/ptrace.c
index f4e1e5eb8e12..8ed1b01a6a87 100644
--- a/arch/m68k/kernel/ptrace.c
+++ b/arch/m68k/kernel/ptrace.c
@@ -95,7 +95,7 @@ static inline int put_reg(struct task_struct *task, int regno,
95 if (regno == PT_USP) 95 if (regno == PT_USP)
96 addr = &task->thread.usp; 96 addr = &task->thread.usp;
97 else if (regno < sizeof(regoff)/sizeof(regoff[0])) 97 else if (regno < sizeof(regoff)/sizeof(regoff[0]))
98 addr = (unsigned long *) (task->thread.esp0 + regoff[regno]); 98 addr = (unsigned long *)(task->thread.esp0 + regoff[regno]);
99 else 99 else
100 return -1; 100 return -1;
101 *addr = data; 101 *addr = data;
@@ -103,48 +103,56 @@ static inline int put_reg(struct task_struct *task, int regno,
103} 103}
104 104
105/* 105/*
106 * Called by kernel/ptrace.c when detaching..
107 *
108 * Make sure the single step bit is not set. 106 * Make sure the single step bit is not set.
109 */ 107 */
110void ptrace_disable(struct task_struct *child) 108static inline void singlestep_disable(struct task_struct *child)
111{ 109{
112 unsigned long tmp; 110 unsigned long tmp = get_reg(child, PT_SR) & ~(TRACE_BITS << 16);
113 /* make sure the single step bit is not set. */
114 tmp = get_reg(child, PT_SR) & ~(TRACE_BITS << 16);
115 put_reg(child, PT_SR, tmp); 111 put_reg(child, PT_SR, tmp);
116 child->thread.work.delayed_trace = 0; 112 child->thread.work.delayed_trace = 0;
113}
114
115/*
116 * Called by kernel/ptrace.c when detaching..
117 */
118void ptrace_disable(struct task_struct *child)
119{
120 singlestep_disable(child);
117 child->thread.work.syscall_trace = 0; 121 child->thread.work.syscall_trace = 0;
118} 122}
119 123
120asmlinkage int sys_ptrace(long request, long pid, long addr, long data) 124asmlinkage int sys_ptrace(long request, long pid, long addr, long data)
121{ 125{
122 struct task_struct *child; 126 struct task_struct *child;
123 int ret; 127 unsigned long tmp;
128 int i, ret = 0;
124 129
125 lock_kernel(); 130 lock_kernel();
126 ret = -EPERM;
127 if (request == PTRACE_TRACEME) { 131 if (request == PTRACE_TRACEME) {
128 /* are we already being traced? */ 132 /* are we already being traced? */
129 if (current->ptrace & PT_PTRACED) 133 if (current->ptrace & PT_PTRACED) {
134 ret = -EPERM;
130 goto out; 135 goto out;
136 }
131 /* set the ptrace bit in the process flags. */ 137 /* set the ptrace bit in the process flags. */
132 current->ptrace |= PT_PTRACED; 138 current->ptrace |= PT_PTRACED;
133 ret = 0;
134 goto out; 139 goto out;
135 } 140 }
136 ret = -ESRCH;
137 read_lock(&tasklist_lock); 141 read_lock(&tasklist_lock);
138 child = find_task_by_pid(pid); 142 child = find_task_by_pid(pid);
139 if (child) 143 if (child)
140 get_task_struct(child); 144 get_task_struct(child);
141 read_unlock(&tasklist_lock); 145 read_unlock(&tasklist_lock);
142 if (!child) 146 if (unlikely(!child)) {
147 ret = -ESRCH;
143 goto out; 148 goto out;
149 }
144 150
145 ret = -EPERM; 151 /* you may not mess with init */
146 if (pid == 1) /* you may not mess with init */ 152 if (unlikely(pid == 1)) {
153 ret = -EPERM;
147 goto out_tsk; 154 goto out_tsk;
155 }
148 156
149 if (request == PTRACE_ATTACH) { 157 if (request == PTRACE_ATTACH) {
150 ret = ptrace_attach(child); 158 ret = ptrace_attach(child);
@@ -152,227 +160,171 @@ asmlinkage int sys_ptrace(long request, long pid, long addr, long data)
152 } 160 }
153 161
154 ret = ptrace_check_attach(child, request == PTRACE_KILL); 162 ret = ptrace_check_attach(child, request == PTRACE_KILL);
155 if (ret < 0) 163 if (ret)
156 goto out_tsk; 164 goto out_tsk;
157 165
158 switch (request) { 166 switch (request) {
159 /* when I and D space are separate, these will need to be fixed. */ 167 /* when I and D space are separate, these will need to be fixed. */
160 case PTRACE_PEEKTEXT: /* read word at location addr. */ 168 case PTRACE_PEEKTEXT: /* read word at location addr. */
161 case PTRACE_PEEKDATA: { 169 case PTRACE_PEEKDATA:
162 unsigned long tmp; 170 i = access_process_vm(child, addr, &tmp, sizeof(tmp), 0);
163 int copied; 171 if (i != sizeof(tmp))
164 172 goto out_eio;
165 copied = access_process_vm(child, addr, &tmp, sizeof(tmp), 0); 173 ret = put_user(tmp, (unsigned long *)data);
166 ret = -EIO; 174 break;
167 if (copied != sizeof(tmp))
168 break;
169 ret = put_user(tmp,(unsigned long *) data);
170 break;
171 }
172 175
173 /* read the word at location addr in the USER area. */ 176 /* read the word at location addr in the USER area. */
174 case PTRACE_PEEKUSR: { 177 case PTRACE_PEEKUSR:
175 unsigned long tmp; 178 if (addr & 3)
176 179 goto out_eio;
177 ret = -EIO; 180 addr >>= 2; /* temporary hack. */
178 if ((addr & 3) || addr < 0 || 181
179 addr > sizeof(struct user) - 3) 182 if (addr >= 0 && addr < 19) {
180 break; 183 tmp = get_reg(child, addr);
181 184 if (addr == PT_SR)
182 tmp = 0; /* Default return condition */ 185 tmp >>= 16;
183 addr = addr >> 2; /* temporary hack. */ 186 } else if (addr >= 21 && addr < 49) {
184 ret = -EIO; 187 tmp = child->thread.fp[addr - 21];
185 if (addr < 19) { 188 /* Convert internal fpu reg representation
186 tmp = get_reg(child, addr); 189 * into long double format
187 if (addr == PT_SR) 190 */
188 tmp >>= 16; 191 if (FPU_IS_EMU && (addr < 45) && !(addr % 3))
189 } else if (addr >= 21 && addr < 49) { 192 tmp = ((tmp & 0xffff0000) << 15) |
190 tmp = child->thread.fp[addr - 21]; 193 ((tmp & 0x0000ffff) << 16);
191#ifdef CONFIG_M68KFPU_EMU 194 } else
192 /* Convert internal fpu reg representation
193 * into long double format
194 */
195 if (FPU_IS_EMU && (addr < 45) && !(addr % 3))
196 tmp = ((tmp & 0xffff0000) << 15) |
197 ((tmp & 0x0000ffff) << 16);
198#endif
199 } else
200 break;
201 ret = put_user(tmp,(unsigned long *) data);
202 break;
203 }
204
205 /* when I and D space are separate, this will have to be fixed. */
206 case PTRACE_POKETEXT: /* write the word at location addr. */
207 case PTRACE_POKEDATA:
208 ret = 0;
209 if (access_process_vm(child, addr, &data, sizeof(data), 1) == sizeof(data))
210 break;
211 ret = -EIO;
212 break;
213
214 case PTRACE_POKEUSR: /* write the word at location addr in the USER area */
215 ret = -EIO;
216 if ((addr & 3) || addr < 0 ||
217 addr > sizeof(struct user) - 3)
218 break;
219
220 addr = addr >> 2; /* temporary hack. */
221
222 if (addr == PT_SR) {
223 data &= SR_MASK;
224 data <<= 16;
225 data |= get_reg(child, PT_SR) & ~(SR_MASK << 16);
226 }
227 if (addr < 19) {
228 if (put_reg(child, addr, data))
229 break;
230 ret = 0;
231 break;
232 }
233 if (addr >= 21 && addr < 48)
234 {
235#ifdef CONFIG_M68KFPU_EMU
236 /* Convert long double format
237 * into internal fpu reg representation
238 */
239 if (FPU_IS_EMU && (addr < 45) && !(addr % 3)) {
240 data = (unsigned long)data << 15;
241 data = (data & 0xffff0000) |
242 ((data & 0x0000ffff) >> 1);
243 }
244#endif
245 child->thread.fp[addr - 21] = data;
246 ret = 0;
247 }
248 break; 195 break;
249 196 ret = put_user(tmp, (unsigned long *)data);
250 case PTRACE_SYSCALL: /* continue and stop at next (return from) syscall */ 197 break;
251 case PTRACE_CONT: { /* restart after signal. */ 198
252 long tmp; 199 /* when I and D space are separate, this will have to be fixed. */
253 200 case PTRACE_POKETEXT: /* write the word at location addr. */
254 ret = -EIO; 201 case PTRACE_POKEDATA:
255 if (!valid_signal(data)) 202 if (access_process_vm(child, addr, &data, sizeof(data), 1) != sizeof(data))
256 break; 203 goto out_eio;
257 if (request == PTRACE_SYSCALL) { 204 break;
258 child->thread.work.syscall_trace = ~0; 205
259 } else { 206 case PTRACE_POKEUSR: /* write the word at location addr in the USER area */
260 child->thread.work.syscall_trace = 0; 207 if (addr & 3)
208 goto out_eio;
209 addr >>= 2; /* temporary hack. */
210
211 if (addr == PT_SR) {
212 data &= SR_MASK;
213 data <<= 16;
214 data |= get_reg(child, PT_SR) & ~(SR_MASK << 16);
215 } else if (addr >= 0 && addr < 19) {
216 if (put_reg(child, addr, data))
217 goto out_eio;
218 } else if (addr >= 21 && addr < 48) {
219 /* Convert long double format
220 * into internal fpu reg representation
221 */
222 if (FPU_IS_EMU && (addr < 45) && !(addr % 3)) {
223 data = (unsigned long)data << 15;
224 data = (data & 0xffff0000) |
225 ((data & 0x0000ffff) >> 1);
261 } 226 }
262 child->exit_code = data; 227 child->thread.fp[addr - 21] = data;
263 /* make sure the single step bit is not set. */ 228 } else
264 tmp = get_reg(child, PT_SR) & ~(TRACE_BITS << 16); 229 goto out_eio;
265 put_reg(child, PT_SR, tmp); 230 break;
266 child->thread.work.delayed_trace = 0; 231
267 wake_up_process(child); 232 case PTRACE_SYSCALL: /* continue and stop at next (return from) syscall */
268 ret = 0; 233 case PTRACE_CONT: /* restart after signal. */
269 break; 234 if (!valid_signal(data))
270 } 235 goto out_eio;
271 236
272/* 237 if (request == PTRACE_SYSCALL)
273 * make the child exit. Best I can do is send it a sigkill. 238 child->thread.work.syscall_trace = ~0;
274 * perhaps it should be put in the status that it wants to 239 else
275 * exit.
276 */
277 case PTRACE_KILL: {
278 long tmp;
279
280 ret = 0;
281 if (child->exit_state == EXIT_ZOMBIE) /* already dead */
282 break;
283 child->exit_code = SIGKILL;
284 /* make sure the single step bit is not set. */
285 tmp = get_reg(child, PT_SR) & ~(TRACE_BITS << 16);
286 put_reg(child, PT_SR, tmp);
287 child->thread.work.delayed_trace = 0;
288 wake_up_process(child);
289 break;
290 }
291
292 case PTRACE_SINGLESTEP: { /* set the trap flag. */
293 long tmp;
294
295 ret = -EIO;
296 if (!valid_signal(data))
297 break;
298 child->thread.work.syscall_trace = 0; 240 child->thread.work.syscall_trace = 0;
299 tmp = get_reg(child, PT_SR) | (TRACE_BITS << 16); 241 child->exit_code = data;
300 put_reg(child, PT_SR, tmp); 242 singlestep_disable(child);
301 child->thread.work.delayed_trace = 1; 243 wake_up_process(child);
302 244 break;
303 child->exit_code = data;
304 /* give it a chance to run. */
305 wake_up_process(child);
306 ret = 0;
307 break;
308 }
309 245
310 case PTRACE_DETACH: /* detach a process that was attached. */ 246 /*
311 ret = ptrace_detach(child, data); 247 * make the child exit. Best I can do is send it a sigkill.
248 * perhaps it should be put in the status that it wants to
249 * exit.
250 */
251 case PTRACE_KILL:
252 if (child->exit_state == EXIT_ZOMBIE) /* already dead */
312 break; 253 break;
313 254 child->exit_code = SIGKILL;
314 case PTRACE_GETREGS: { /* Get all gp regs from the child. */ 255 singlestep_disable(child);
315 int i; 256 wake_up_process(child);
316 unsigned long tmp; 257 break;
317 for (i = 0; i < 19; i++) { 258
318 tmp = get_reg(child, i); 259 case PTRACE_SINGLESTEP: /* set the trap flag. */
319 if (i == PT_SR) 260 if (!valid_signal(data))
261 goto out_eio;
262
263 child->thread.work.syscall_trace = 0;
264 tmp = get_reg(child, PT_SR) | (TRACE_BITS << 16);
265 put_reg(child, PT_SR, tmp);
266 child->thread.work.delayed_trace = 1;
267
268 child->exit_code = data;
269 /* give it a chance to run. */
270 wake_up_process(child);
271 break;
272
273 case PTRACE_DETACH: /* detach a process that was attached. */
274 ret = ptrace_detach(child, data);
275 break;
276
277 case PTRACE_GETREGS: /* Get all gp regs from the child. */
278 for (i = 0; i < 19; i++) {
279 tmp = get_reg(child, i);
280 if (i == PT_SR)
320 tmp >>= 16; 281 tmp >>= 16;
321 if (put_user(tmp, (unsigned long *) data)) { 282 ret = put_user(tmp, (unsigned long *)data);
322 ret = -EFAULT; 283 if (ret)
323 break; 284 break;
324 } 285 data += sizeof(long);
325 data += sizeof(long);
326 }
327 ret = 0;
328 break;
329 } 286 }
287 break;
330 288
331 case PTRACE_SETREGS: { /* Set all gp regs in the child. */ 289 case PTRACE_SETREGS: /* Set all gp regs in the child. */
332 int i; 290 for (i = 0; i < 19; i++) {
333 unsigned long tmp; 291 ret = get_user(tmp, (unsigned long *)data);
334 for (i = 0; i < 19; i++) { 292 if (ret)
335 if (get_user(tmp, (unsigned long *) data)) {
336 ret = -EFAULT;
337 break; 293 break;
338 } 294 if (i == PT_SR) {
339 if (i == PT_SR) {
340 tmp &= SR_MASK; 295 tmp &= SR_MASK;
341 tmp <<= 16; 296 tmp <<= 16;
342 tmp |= get_reg(child, PT_SR) & ~(SR_MASK << 16); 297 tmp |= get_reg(child, PT_SR) & ~(SR_MASK << 16);
343 }
344 put_reg(child, i, tmp);
345 data += sizeof(long);
346 } 298 }
347 ret = 0; 299 put_reg(child, i, tmp);
348 break; 300 data += sizeof(long);
349 } 301 }
350 302 break;
351 case PTRACE_GETFPREGS: { /* Get the child FPU state. */ 303
352 ret = 0; 304 case PTRACE_GETFPREGS: /* Get the child FPU state. */
353 if (copy_to_user((void *)data, &child->thread.fp, 305 if (copy_to_user((void *)data, &child->thread.fp,
354 sizeof(struct user_m68kfp_struct))) 306 sizeof(struct user_m68kfp_struct)))
355 ret = -EFAULT; 307 ret = -EFAULT;
356 break; 308 break;
357 } 309
358 310 case PTRACE_SETFPREGS: /* Set the child FPU state. */
359 case PTRACE_SETFPREGS: { /* Set the child FPU state. */ 311 if (copy_from_user(&child->thread.fp, (void *)data,
360 ret = 0; 312 sizeof(struct user_m68kfp_struct)))
361 if (copy_from_user(&child->thread.fp, (void *)data, 313 ret = -EFAULT;
362 sizeof(struct user_m68kfp_struct))) 314 break;
363 ret = -EFAULT; 315
364 break; 316 default:
365 } 317 ret = ptrace_request(child, request, addr, data);
366 318 break;
367 default:
368 ret = ptrace_request(child, request, addr, data);
369 break;
370 } 319 }
371out_tsk: 320out_tsk:
372 put_task_struct(child); 321 put_task_struct(child);
373out: 322out:
374 unlock_kernel(); 323 unlock_kernel();
375 return ret; 324 return ret;
325out_eio:
326 ret = -EIO;
327 goto out_tsk;
376} 328}
377 329
378asmlinkage void syscall_trace(void) 330asmlinkage void syscall_trace(void)
generated by cgit v1.2.2 (git 2.25.0) at 2024-11-21 12:07:22 -0500