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git.proxmox.com Git - mirror_ubuntu-jammy-kernel.git/blob - arch/blackfin/kernel/ptrace.c
2 * File: arch/blackfin/kernel/ptrace.c
3 * Based on: Taken from linux/kernel/ptrace.c
4 * Author: linux/kernel/ptrace.c is by Ross Biro 1/23/92, edited by Linus Torvalds
10 * Copyright 2004-2006 Analog Devices Inc.
12 * Bugs: Enter bugs at http://blackfin.uclinux.org/
14 * This program is free software; you can redistribute it and/or modify
15 * it under the terms of the GNU General Public License as published by
16 * the Free Software Foundation; either version 2 of the License, or
17 * (at your option) any later version.
19 * This program is distributed in the hope that it will be useful,
20 * but WITHOUT ANY WARRANTY; without even the implied warranty of
21 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
22 * GNU General Public License for more details.
24 * You should have received a copy of the GNU General Public License
25 * along with this program; if not, see the file COPYING, or write
26 * to the Free Software Foundation, Inc.,
27 * 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
30 #include <linux/kernel.h>
31 #include <linux/sched.h>
33 #include <linux/smp.h>
34 #include <linux/smp_lock.h>
35 #include <linux/errno.h>
36 #include <linux/ptrace.h>
37 #include <linux/user.h>
38 #include <linux/signal.h>
39 #include <linux/uaccess.h>
42 #include <asm/pgtable.h>
43 #include <asm/system.h>
44 #include <asm/processor.h>
45 #include <asm/asm-offsets.h>
47 #include <asm/fixed_code.h>
48 #include <asm/cacheflush.h>
49 #include <asm/mem_map.h>
53 * does not yet catch signals sent when the child dies.
54 * in exit.c or in signal.c.
57 /* determines which bits in the SYSCFG reg the user has access to. */
58 /* 1 = access 0 = no access */
59 #define SYSCFG_MASK 0x0007 /* SYSCFG reg */
60 /* sets the trace bits. */
61 #define TRACE_BITS 0x0001
63 /* Find the stack offset for a register, relative to thread.esp0. */
64 #define PT_REG(reg) ((long)&((struct pt_regs *)0)->reg)
67 * Get the address of the live pt_regs for the specified task.
68 * These are saved onto the top kernel stack when the process
71 * Note: if a user thread is execve'd from kernel space, the
72 * kernel stack will not be empty on entry to the kernel, so
73 * ptracing these tasks will fail.
75 static inline struct pt_regs
*get_user_regs(struct task_struct
*task
)
77 return (struct pt_regs
*)
78 ((unsigned long)task_stack_page(task
) +
79 (THREAD_SIZE
- sizeof(struct pt_regs
)));
83 * Get all user integer registers.
85 static inline int ptrace_getregs(struct task_struct
*tsk
, void __user
*uregs
)
88 memcpy(®s
, get_user_regs(tsk
), sizeof(regs
));
89 regs
.usp
= tsk
->thread
.usp
;
90 return copy_to_user(uregs
, ®s
, sizeof(struct pt_regs
)) ? -EFAULT
: 0;
93 /* Mapping from PT_xxx to the stack offset at which the register is
94 * saved. Notice that usp has no stack-slot and needs to be treated
95 * specially (see get_reg/put_reg below).
99 * Get contents of register REGNO in task TASK.
101 static inline long get_reg(struct task_struct
*task
, int regno
)
103 unsigned char *reg_ptr
;
105 struct pt_regs
*regs
=
106 (struct pt_regs
*)((unsigned long)task_stack_page(task
) +
107 (THREAD_SIZE
- sizeof(struct pt_regs
)));
108 reg_ptr
= (char *)regs
;
112 return task
->thread
.usp
;
115 return *(long *)(reg_ptr
+ regno
);
117 /* slight mystery ... never seems to come here but kernel misbehaves without this code! */
119 printk(KERN_WARNING
"Request to get for unknown register %d\n", regno
);
124 * Write contents of register REGNO in task TASK.
127 put_reg(struct task_struct
*task
, int regno
, unsigned long data
)
131 struct pt_regs
*regs
=
132 (struct pt_regs
*)((unsigned long)task_stack_page(task
) +
133 (THREAD_SIZE
- sizeof(struct pt_regs
)));
134 reg_ptr
= (char *)regs
;
138 /*********************************************************************/
139 /* At this point the kernel is most likely in exception. */
140 /* The RETX register will be used to populate the pc of the process. */
141 /*********************************************************************/
146 break; /* regs->retx = data; break; */
149 task
->thread
.usp
= data
;
153 *(long *)(reg_ptr
+ regno
) = data
;
159 * check that an address falls within the bounds of the target process's memory mappings
161 static inline int is_user_addr_valid(struct task_struct
*child
,
162 unsigned long start
, unsigned long len
)
164 struct vm_area_struct
*vma
;
165 struct sram_list_struct
*sraml
;
168 if (start
+ len
< start
)
171 vma
= find_vma(child
->mm
, start
);
172 if (vma
&& start
>= vma
->vm_start
&& start
+ len
<= vma
->vm_end
)
175 for (sraml
= child
->mm
->context
.sram_list
; sraml
; sraml
= sraml
->next
)
176 if (start
>= (unsigned long)sraml
->addr
177 && start
+ len
< (unsigned long)sraml
->addr
+ sraml
->length
)
180 if (start
>= FIXED_CODE_START
&& start
+ len
< FIXED_CODE_END
)
186 void ptrace_enable(struct task_struct
*child
)
189 tmp
= get_reg(child
, PT_SYSCFG
) | (TRACE_BITS
);
190 put_reg(child
, PT_SYSCFG
, tmp
);
194 * Called by kernel/ptrace.c when detaching..
196 * Make sure the single step bit is not set.
198 void ptrace_disable(struct task_struct
*child
)
201 /* make sure the single step bit is not set. */
202 tmp
= get_reg(child
, PT_SYSCFG
) & ~TRACE_BITS
;
203 put_reg(child
, PT_SYSCFG
, tmp
);
206 long arch_ptrace(struct task_struct
*child
, long request
, long addr
, long data
)
209 unsigned long __user
*datap
= (unsigned long __user
*)data
;
212 /* when I and D space are separate, these will need to be fixed. */
213 case PTRACE_PEEKDATA
:
214 pr_debug("ptrace: PEEKDATA\n");
216 case PTRACE_PEEKTEXT
: /* read word at location addr. */
218 unsigned long tmp
= 0;
222 pr_debug("ptrace: PEEKTEXT at addr 0x%08lx + %ld\n", addr
, sizeof(data
));
223 if (is_user_addr_valid(child
, addr
, sizeof(tmp
)) < 0)
225 pr_debug("ptrace: user address is valid\n");
227 if (L1_CODE_LENGTH
!= 0 && addr
>= get_l1_code_start()
228 && addr
+ sizeof(tmp
) <= get_l1_code_start() + L1_CODE_LENGTH
) {
229 safe_dma_memcpy (&tmp
, (const void *)(addr
), sizeof(tmp
));
230 copied
= sizeof(tmp
);
232 } else if (L1_DATA_A_LENGTH
!= 0 && addr
>= L1_DATA_A_START
233 && addr
+ sizeof(tmp
) <= L1_DATA_A_START
+ L1_DATA_A_LENGTH
) {
234 memcpy(&tmp
, (const void *)(addr
), sizeof(tmp
));
235 copied
= sizeof(tmp
);
237 } else if (L1_DATA_B_LENGTH
!= 0 && addr
>= L1_DATA_B_START
238 && addr
+ sizeof(tmp
) <= L1_DATA_B_START
+ L1_DATA_B_LENGTH
) {
239 memcpy(&tmp
, (const void *)(addr
), sizeof(tmp
));
240 copied
= sizeof(tmp
);
242 } else if (addr
>= FIXED_CODE_START
243 && addr
+ sizeof(tmp
) <= FIXED_CODE_END
) {
244 copy_from_user_page(0, 0, 0, &tmp
, (const void *)(addr
), sizeof(tmp
));
245 copied
= sizeof(tmp
);
248 copied
= access_process_vm(child
, addr
, &tmp
,
251 pr_debug("ptrace: copied size %d [0x%08lx]\n", copied
, tmp
);
252 if (copied
!= sizeof(tmp
))
254 ret
= put_user(tmp
, datap
);
258 /* read the word at location addr in the USER area. */
264 if ((addr
& 3) || (addr
> (sizeof(struct pt_regs
) + 16))) {
265 printk(KERN_WARNING
"ptrace error : PEEKUSR : temporarily returning "
266 "0 - %x sizeof(pt_regs) is %lx\n",
267 (int)addr
, sizeof(struct pt_regs
));
270 if (addr
== sizeof(struct pt_regs
)) {
272 tmp
= child
->mm
->start_code
+ TEXT_OFFSET
;
273 } else if (addr
== (sizeof(struct pt_regs
) + 4)) {
274 /* PT_TEXT_END_ADDR */
275 tmp
= child
->mm
->end_code
;
276 } else if (addr
== (sizeof(struct pt_regs
) + 8)) {
278 tmp
= child
->mm
->start_data
;
279 #ifdef CONFIG_BINFMT_ELF_FDPIC
280 } else if (addr
== (sizeof(struct pt_regs
) + 12)) {
281 tmp
= child
->mm
->context
.exec_fdpic_loadmap
;
282 } else if (addr
== (sizeof(struct pt_regs
) + 16)) {
283 tmp
= child
->mm
->context
.interp_fdpic_loadmap
;
286 tmp
= get_reg(child
, addr
);
288 ret
= put_user(tmp
, datap
);
292 /* when I and D space are separate, this will have to be fixed. */
293 case PTRACE_POKEDATA
:
294 pr_debug("ptrace: PTRACE_PEEKDATA\n");
296 case PTRACE_POKETEXT
: /* write the word at location addr. */
301 pr_debug("ptrace: POKETEXT at addr 0x%08lx + %ld bytes %lx\n",
302 addr
, sizeof(data
), data
);
303 if (is_user_addr_valid(child
, addr
, sizeof(data
)) < 0)
305 pr_debug("ptrace: user address is valid\n");
307 if (L1_CODE_LENGTH
!= 0 && addr
>= get_l1_code_start()
308 && addr
+ sizeof(data
) <= get_l1_code_start() + L1_CODE_LENGTH
) {
309 safe_dma_memcpy ((void *)(addr
), &data
, sizeof(data
));
310 copied
= sizeof(data
);
312 } else if (L1_DATA_A_LENGTH
!= 0 && addr
>= L1_DATA_A_START
313 && addr
+ sizeof(data
) <= L1_DATA_A_START
+ L1_DATA_A_LENGTH
) {
314 memcpy((void *)(addr
), &data
, sizeof(data
));
315 copied
= sizeof(data
);
317 } else if (L1_DATA_B_LENGTH
!= 0 && addr
>= L1_DATA_B_START
318 && addr
+ sizeof(data
) <= L1_DATA_B_START
+ L1_DATA_B_LENGTH
) {
319 memcpy((void *)(addr
), &data
, sizeof(data
));
320 copied
= sizeof(data
);
322 } else if (addr
>= FIXED_CODE_START
323 && addr
+ sizeof(data
) <= FIXED_CODE_END
) {
324 copy_to_user_page(0, 0, 0, (void *)(addr
), &data
, sizeof(data
));
325 copied
= sizeof(data
);
328 copied
= access_process_vm(child
, addr
, &data
,
331 pr_debug("ptrace: copied size %d\n", copied
);
332 if (copied
!= sizeof(data
))
338 case PTRACE_POKEUSR
: /* write the word at location addr in the USER area */
340 if ((addr
& 3) || (addr
> (sizeof(struct pt_regs
) + 16))) {
341 printk(KERN_WARNING
"ptrace error : POKEUSR: temporarily returning 0\n");
345 if (addr
>= (sizeof(struct pt_regs
))) {
349 if (addr
== PT_SYSCFG
) {
351 data
|= get_reg(child
, PT_SYSCFG
);
353 ret
= put_reg(child
, addr
, data
);
356 case PTRACE_SYSCALL
: /* continue and stop at next (return from) syscall */
357 case PTRACE_CONT
: /* restart after signal. */
358 pr_debug("ptrace: syscall/cont\n");
361 if (!valid_signal(data
))
363 if (request
== PTRACE_SYSCALL
)
364 set_tsk_thread_flag(child
, TIF_SYSCALL_TRACE
);
366 clear_tsk_thread_flag(child
, TIF_SYSCALL_TRACE
);
367 child
->exit_code
= data
;
368 ptrace_disable(child
);
369 pr_debug("ptrace: before wake_up_process\n");
370 wake_up_process(child
);
375 * make the child exit. Best I can do is send it a sigkill.
376 * perhaps it should be put in the status that it wants to
381 if (child
->exit_state
== EXIT_ZOMBIE
) /* already dead */
383 child
->exit_code
= SIGKILL
;
384 ptrace_disable(child
);
385 wake_up_process(child
);
388 case PTRACE_SINGLESTEP
: /* set the trap flag. */
389 pr_debug("ptrace: single step\n");
391 if (!valid_signal(data
))
393 clear_tsk_thread_flag(child
, TIF_SYSCALL_TRACE
);
394 ptrace_enable(child
);
395 child
->exit_code
= data
;
396 wake_up_process(child
);
401 /* Get all gp regs from the child. */
402 ret
= ptrace_getregs(child
, datap
);
406 printk(KERN_WARNING
"ptrace: SETREGS: **** NOT IMPLEMENTED ***\n");
407 /* Set all gp regs in the child. */
412 ret
= ptrace_request(child
, request
, addr
, data
);
419 asmlinkage
void syscall_trace(void)
421 if (!test_thread_flag(TIF_SYSCALL_TRACE
))
424 if (!(current
->ptrace
& PT_PTRACED
))
427 /* the 0x80 provides a way for the tracing parent to distinguish
428 * between a syscall stop and SIGTRAP delivery
430 ptrace_notify(SIGTRAP
| ((current
->ptrace
& PT_TRACESYSGOOD
)
434 * this isn't the same as continuing with a signal, but it will do
435 * for normal use. strace only continues with a signal if the
436 * stopping signal is not SIGTRAP. -brl
438 if (current
->exit_code
) {
439 send_sig(current
->exit_code
, current
, 1);
440 current
->exit_code
= 0;