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-rw-r--r--arch/m68k/kernel/ptrace.c393
1 files changed, 393 insertions, 0 deletions
diff --git a/arch/m68k/kernel/ptrace.c b/arch/m68k/kernel/ptrace.c
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1/*
2 * linux/arch/m68k/kernel/ptrace.c
3 *
4 * Copyright (C) 1994 by Hamish Macdonald
5 * Taken from linux/kernel/ptrace.c and modified for M680x0.
6 * linux/kernel/ptrace.c is by Ross Biro 1/23/92, edited by Linus Torvalds
7 *
8 * This file is subject to the terms and conditions of the GNU General
9 * Public License. See the file COPYING in the main directory of
10 * this archive for more details.
11 */
12
13#include <linux/kernel.h>
14#include <linux/sched.h>
15#include <linux/mm.h>
16#include <linux/smp.h>
17#include <linux/smp_lock.h>
18#include <linux/errno.h>
19#include <linux/ptrace.h>
20#include <linux/user.h>
21#include <linux/config.h>
22
23#include <asm/uaccess.h>
24#include <asm/page.h>
25#include <asm/pgtable.h>
26#include <asm/system.h>
27#include <asm/processor.h>
28
29/*
30 * does not yet catch signals sent when the child dies.
31 * in exit.c or in signal.c.
32 */
33
34/* determines which bits in the SR the user has access to. */
35/* 1 = access 0 = no access */
36#define SR_MASK 0x001f
37
38/* sets the trace bits. */
39#define TRACE_BITS 0x8000
40
41/* Find the stack offset for a register, relative to thread.esp0. */
42#define PT_REG(reg) ((long)&((struct pt_regs *)0)->reg)
43#define SW_REG(reg) ((long)&((struct switch_stack *)0)->reg \
44 - sizeof(struct switch_stack))
45/* Mapping from PT_xxx to the stack offset at which the register is
46 saved. Notice that usp has no stack-slot and needs to be treated
47 specially (see get_reg/put_reg below). */
48static int regoff[] = {
49 [0] = PT_REG(d1),
50 [1] = PT_REG(d2),
51 [2] = PT_REG(d3),
52 [3] = PT_REG(d4),
53 [4] = PT_REG(d5),
54 [5] = SW_REG(d6),
55 [6] = SW_REG(d7),
56 [7] = PT_REG(a0),
57 [8] = PT_REG(a1),
58 [9] = PT_REG(a2),
59 [10] = SW_REG(a3),
60 [11] = SW_REG(a4),
61 [12] = SW_REG(a5),
62 [13] = SW_REG(a6),
63 [14] = PT_REG(d0),
64 [15] = -1,
65 [16] = PT_REG(orig_d0),
66 [17] = PT_REG(sr),
67 [18] = PT_REG(pc),
68};
69
70/*
71 * Get contents of register REGNO in task TASK.
72 */
73static inline long get_reg(struct task_struct *task, int regno)
74{
75 unsigned long *addr;
76
77 if (regno == PT_USP)
78 addr = &task->thread.usp;
79 else if (regno < sizeof(regoff)/sizeof(regoff[0]))
80 addr = (unsigned long *)(task->thread.esp0 + regoff[regno]);
81 else
82 return 0;
83 return *addr;
84}
85
86/*
87 * Write contents of register REGNO in task TASK.
88 */
89static inline int put_reg(struct task_struct *task, int regno,
90 unsigned long data)
91{
92 unsigned long *addr;
93
94 if (regno == PT_USP)
95 addr = &task->thread.usp;
96 else if (regno < sizeof(regoff)/sizeof(regoff[0]))
97 addr = (unsigned long *) (task->thread.esp0 + regoff[regno]);
98 else
99 return -1;
100 *addr = data;
101 return 0;
102}
103
104/*
105 * Called by kernel/ptrace.c when detaching..
106 *
107 * Make sure the single step bit is not set.
108 */
109void ptrace_disable(struct task_struct *child)
110{
111 unsigned long tmp;
112 /* make sure the single step bit is not set. */
113 tmp = get_reg(child, PT_SR) & ~(TRACE_BITS << 16);
114 put_reg(child, PT_SR, tmp);
115 child->thread.work.delayed_trace = 0;
116 child->thread.work.syscall_trace = 0;
117}
118
119asmlinkage int sys_ptrace(long request, long pid, long addr, long data)
120{
121 struct task_struct *child;
122 int ret;
123
124 lock_kernel();
125 ret = -EPERM;
126 if (request == PTRACE_TRACEME) {
127 /* are we already being traced? */
128 if (current->ptrace & PT_PTRACED)
129 goto out;
130 /* set the ptrace bit in the process flags. */
131 current->ptrace |= PT_PTRACED;
132 ret = 0;
133 goto out;
134 }
135 ret = -ESRCH;
136 read_lock(&tasklist_lock);
137 child = find_task_by_pid(pid);
138 if (child)
139 get_task_struct(child);
140 read_unlock(&tasklist_lock);
141 if (!child)
142 goto out;
143
144 ret = -EPERM;
145 if (pid == 1) /* you may not mess with init */
146 goto out_tsk;
147
148 if (request == PTRACE_ATTACH) {
149 ret = ptrace_attach(child);
150 goto out_tsk;
151 }
152
153 ret = ptrace_check_attach(child, request == PTRACE_KILL);
154 if (ret < 0)
155 goto out_tsk;
156
157 switch (request) {
158 /* when I and D space are separate, these will need to be fixed. */
159 case PTRACE_PEEKTEXT: /* read word at location addr. */
160 case PTRACE_PEEKDATA: {
161 unsigned long tmp;
162 int copied;
163
164 copied = access_process_vm(child, addr, &tmp, sizeof(tmp), 0);
165 ret = -EIO;
166 if (copied != sizeof(tmp))
167 break;
168 ret = put_user(tmp,(unsigned long *) data);
169 break;
170 }
171
172 /* read the word at location addr in the USER area. */
173 case PTRACE_PEEKUSR: {
174 unsigned long tmp;
175
176 ret = -EIO;
177 if ((addr & 3) || addr < 0 ||
178 addr > sizeof(struct user) - 3)
179 break;
180
181 tmp = 0; /* Default return condition */
182 addr = addr >> 2; /* temporary hack. */
183 ret = -EIO;
184 if (addr < 19) {
185 tmp = get_reg(child, addr);
186 if (addr == PT_SR)
187 tmp >>= 16;
188 } else if (addr >= 21 && addr < 49) {
189 tmp = child->thread.fp[addr - 21];
190#ifdef CONFIG_M68KFPU_EMU
191 /* Convert internal fpu reg representation
192 * into long double format
193 */
194 if (FPU_IS_EMU && (addr < 45) && !(addr % 3))
195 tmp = ((tmp & 0xffff0000) << 15) |
196 ((tmp & 0x0000ffff) << 16);
197#endif
198 } else
199 break;
200 ret = put_user(tmp,(unsigned long *) data);
201 break;
202 }
203
204 /* when I and D space are separate, this will have to be fixed. */
205 case PTRACE_POKETEXT: /* write the word at location addr. */
206 case PTRACE_POKEDATA:
207 ret = 0;
208 if (access_process_vm(child, addr, &data, sizeof(data), 1) == sizeof(data))
209 break;
210 ret = -EIO;
211 break;
212
213 case PTRACE_POKEUSR: /* write the word at location addr in the USER area */
214 ret = -EIO;
215 if ((addr & 3) || addr < 0 ||
216 addr > sizeof(struct user) - 3)
217 break;
218
219 addr = addr >> 2; /* temporary hack. */
220
221 if (addr == PT_SR) {
222 data &= SR_MASK;
223 data <<= 16;
224 data |= get_reg(child, PT_SR) & ~(SR_MASK << 16);
225 }
226 if (addr < 19) {
227 if (put_reg(child, addr, data))
228 break;
229 ret = 0;
230 break;
231 }
232 if (addr >= 21 && addr < 48)
233 {
234#ifdef CONFIG_M68KFPU_EMU
235 /* Convert long double format
236 * into internal fpu reg representation
237 */
238 if (FPU_IS_EMU && (addr < 45) && !(addr % 3)) {
239 data = (unsigned long)data << 15;
240 data = (data & 0xffff0000) |
241 ((data & 0x0000ffff) >> 1);
242 }
243#endif
244 child->thread.fp[addr - 21] = data;
245 ret = 0;
246 }
247 break;
248
249 case PTRACE_SYSCALL: /* continue and stop at next (return from) syscall */
250 case PTRACE_CONT: { /* restart after signal. */
251 long tmp;
252
253 ret = -EIO;
254 if ((unsigned long) data > _NSIG)
255 break;
256 if (request == PTRACE_SYSCALL) {
257 child->thread.work.syscall_trace = ~0;
258 } else {
259 child->thread.work.syscall_trace = 0;
260 }
261 child->exit_code = data;
262 /* make sure the single step bit is not set. */
263 tmp = get_reg(child, PT_SR) & ~(TRACE_BITS << 16);
264 put_reg(child, PT_SR, tmp);
265 child->thread.work.delayed_trace = 0;
266 wake_up_process(child);
267 ret = 0;
268 break;
269 }
270
271/*
272 * make the child exit. Best I can do is send it a sigkill.
273 * perhaps it should be put in the status that it wants to
274 * exit.
275 */
276 case PTRACE_KILL: {
277 long tmp;
278
279 ret = 0;
280 if (child->exit_state == EXIT_ZOMBIE) /* already dead */
281 break;
282 child->exit_code = SIGKILL;
283 /* make sure the single step bit is not set. */
284 tmp = get_reg(child, PT_SR) & ~(TRACE_BITS << 16);
285 put_reg(child, PT_SR, tmp);
286 child->thread.work.delayed_trace = 0;
287 wake_up_process(child);
288 break;
289 }
290
291 case PTRACE_SINGLESTEP: { /* set the trap flag. */
292 long tmp;
293
294 ret = -EIO;
295 if ((unsigned long) data > _NSIG)
296 break;
297 child->thread.work.syscall_trace = 0;
298 tmp = get_reg(child, PT_SR) | (TRACE_BITS << 16);
299 put_reg(child, PT_SR, tmp);
300 child->thread.work.delayed_trace = 1;
301
302 child->exit_code = data;
303 /* give it a chance to run. */
304 wake_up_process(child);
305 ret = 0;
306 break;
307 }
308
309 case PTRACE_DETACH: /* detach a process that was attached. */
310 ret = ptrace_detach(child, data);
311 break;
312
313 case PTRACE_GETREGS: { /* Get all gp regs from the child. */
314 int i;
315 unsigned long tmp;
316 for (i = 0; i < 19; i++) {
317 tmp = get_reg(child, i);
318 if (i == PT_SR)
319 tmp >>= 16;
320 if (put_user(tmp, (unsigned long *) data)) {
321 ret = -EFAULT;
322 break;
323 }
324 data += sizeof(long);
325 }
326 ret = 0;
327 break;
328 }
329
330 case PTRACE_SETREGS: { /* Set all gp regs in the child. */
331 int i;
332 unsigned long tmp;
333 for (i = 0; i < 19; i++) {
334 if (get_user(tmp, (unsigned long *) data)) {
335 ret = -EFAULT;
336 break;
337 }
338 if (i == PT_SR) {
339 tmp &= SR_MASK;
340 tmp <<= 16;
341 tmp |= get_reg(child, PT_SR) & ~(SR_MASK << 16);
342 }
343 put_reg(child, i, tmp);
344 data += sizeof(long);
345 }
346 ret = 0;
347 break;
348 }
349
350 case PTRACE_GETFPREGS: { /* Get the child FPU state. */
351 ret = 0;
352 if (copy_to_user((void *)data, &child->thread.fp,
353 sizeof(struct user_m68kfp_struct)))
354 ret = -EFAULT;
355 break;
356 }
357
358 case PTRACE_SETFPREGS: { /* Set the child FPU state. */
359 ret = 0;
360 if (copy_from_user(&child->thread.fp, (void *)data,
361 sizeof(struct user_m68kfp_struct)))
362 ret = -EFAULT;
363 break;
364 }
365
366 default:
367 ret = ptrace_request(child, request, addr, data);
368 break;
369 }
370out_tsk:
371 put_task_struct(child);
372out:
373 unlock_kernel();
374 return ret;
375}
376
377asmlinkage void syscall_trace(void)
378{
379 if (!current->thread.work.delayed_trace &&
380 !current->thread.work.syscall_trace)
381 return;
382 ptrace_notify(SIGTRAP | ((current->ptrace & PT_TRACESYSGOOD)
383 ? 0x80 : 0));
384 /*
385 * this isn't the same as continuing with a signal, but it will do
386 * for normal use. strace only continues with a signal if the
387 * stopping signal is not SIGTRAP. -brl
388 */
389 if (current->exit_code) {
390 send_sig(current->exit_code, current, 1);
391 current->exit_code = 0;
392 }
393}
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