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Linux/arch/blackfin/kernel/ptrace.c

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  1 /*
  2  * linux/kernel/ptrace.c is by Ross Biro 1/23/92, edited by Linus Torvalds
  3  * these modifications are Copyright 2004-2010 Analog Devices Inc.
  4  *
  5  * Licensed under the GPL-2
  6  */
  7 
  8 #include <linux/kernel.h>
  9 #include <linux/sched.h>
 10 #include <linux/mm.h>
 11 #include <linux/smp.h>
 12 #include <linux/elf.h>
 13 #include <linux/errno.h>
 14 #include <linux/ptrace.h>
 15 #include <linux/user.h>
 16 #include <linux/regset.h>
 17 #include <linux/signal.h>
 18 #include <linux/tracehook.h>
 19 #include <linux/uaccess.h>
 20 
 21 #include <asm/page.h>
 22 #include <asm/pgtable.h>
 23 #include <asm/processor.h>
 24 #include <asm/asm-offsets.h>
 25 #include <asm/dma.h>
 26 #include <asm/fixed_code.h>
 27 #include <asm/cacheflush.h>
 28 #include <asm/mem_map.h>
 29 #include <asm/mmu_context.h>
 30 
 31 /*
 32  * does not yet catch signals sent when the child dies.
 33  * in exit.c or in signal.c.
 34  */
 35 
 36 /*
 37  * Get contents of register REGNO in task TASK.
 38  */
 39 static inline long
 40 get_reg(struct task_struct *task, unsigned long regno,
 41         unsigned long __user *datap)
 42 {
 43         long tmp;
 44         struct pt_regs *regs = task_pt_regs(task);
 45 
 46         if (regno & 3 || regno > PT_LAST_PSEUDO)
 47                 return -EIO;
 48 
 49         switch (regno) {
 50         case PT_TEXT_ADDR:
 51                 tmp = task->mm->start_code;
 52                 break;
 53         case PT_TEXT_END_ADDR:
 54                 tmp = task->mm->end_code;
 55                 break;
 56         case PT_DATA_ADDR:
 57                 tmp = task->mm->start_data;
 58                 break;
 59         case PT_USP:
 60                 tmp = task->thread.usp;
 61                 break;
 62         default:
 63                 if (regno < sizeof(*regs)) {
 64                         void *reg_ptr = regs;
 65                         tmp = *(long *)(reg_ptr + regno);
 66                 } else
 67                         return -EIO;
 68         }
 69 
 70         return put_user(tmp, datap);
 71 }
 72 
 73 /*
 74  * Write contents of register REGNO in task TASK.
 75  */
 76 static inline int
 77 put_reg(struct task_struct *task, unsigned long regno, unsigned long data)
 78 {
 79         struct pt_regs *regs = task_pt_regs(task);
 80 
 81         if (regno & 3 || regno > PT_LAST_PSEUDO)
 82                 return -EIO;
 83 
 84         switch (regno) {
 85         case PT_PC:
 86                 /*********************************************************************/
 87                 /* At this point the kernel is most likely in exception.             */
 88                 /* The RETX register will be used to populate the pc of the process. */
 89                 /*********************************************************************/
 90                 regs->retx = data;
 91                 regs->pc = data;
 92                 break;
 93         case PT_RETX:
 94                 break;          /* regs->retx = data; break; */
 95         case PT_USP:
 96                 regs->usp = data;
 97                 task->thread.usp = data;
 98                 break;
 99         case PT_SYSCFG: /* don't let userspace screw with this */
100                 if ((data & ~1) != 0x6)
101                         pr_warning("ptrace: ignore syscfg write of %#lx\n", data);
102                 break;          /* regs->syscfg = data; break; */
103         default:
104                 if (regno < sizeof(*regs)) {
105                         void *reg_offset = regs;
106                         *(long *)(reg_offset + regno) = data;
107                 }
108                 /* Ignore writes to pseudo registers */
109         }
110 
111         return 0;
112 }
113 
114 /*
115  * check that an address falls within the bounds of the target process's memory mappings
116  */
117 int
118 is_user_addr_valid(struct task_struct *child, unsigned long start, unsigned long len)
119 {
120         bool valid;
121         struct vm_area_struct *vma;
122         struct sram_list_struct *sraml;
123 
124         /* overflow */
125         if (start + len < start)
126                 return -EIO;
127 
128         down_read(&child->mm->mmap_sem);
129         vma = find_vma(child->mm, start);
130         valid = vma && start >= vma->vm_start && start + len <= vma->vm_end;
131         up_read(&child->mm->mmap_sem);
132         if (valid)
133                 return 0;
134 
135         for (sraml = child->mm->context.sram_list; sraml; sraml = sraml->next)
136                 if (start >= (unsigned long)sraml->addr
137                     && start + len < (unsigned long)sraml->addr + sraml->length)
138                         return 0;
139 
140         if (start >= FIXED_CODE_START && start + len < FIXED_CODE_END)
141                 return 0;
142 
143 #ifdef CONFIG_APP_STACK_L1
144         if (child->mm->context.l1_stack_save)
145                 if (start >= (unsigned long)l1_stack_base &&
146                         start + len < (unsigned long)l1_stack_base + l1_stack_len)
147                         return 0;
148 #endif
149 
150         return -EIO;
151 }
152 
153 /*
154  * retrieve the contents of Blackfin userspace general registers
155  */
156 static int genregs_get(struct task_struct *target,
157                        const struct user_regset *regset,
158                        unsigned int pos, unsigned int count,
159                        void *kbuf, void __user *ubuf)
160 {
161         struct pt_regs *regs = task_pt_regs(target);
162         int ret;
163 
164         /* This sucks ... */
165         regs->usp = target->thread.usp;
166 
167         ret = user_regset_copyout(&pos, &count, &kbuf, &ubuf,
168                                   regs, 0, sizeof(*regs));
169         if (ret < 0)
170                 return ret;
171 
172         return user_regset_copyout_zero(&pos, &count, &kbuf, &ubuf,
173                                         sizeof(*regs), -1);
174 }
175 
176 /*
177  * update the contents of the Blackfin userspace general registers
178  */
179 static int genregs_set(struct task_struct *target,
180                        const struct user_regset *regset,
181                        unsigned int pos, unsigned int count,
182                        const void *kbuf, const void __user *ubuf)
183 {
184         struct pt_regs *regs = task_pt_regs(target);
185         int ret;
186 
187         /* Don't let people set SYSCFG (it's at the end of pt_regs) */
188         ret = user_regset_copyin(&pos, &count, &kbuf, &ubuf,
189                                  regs, 0, PT_SYSCFG);
190         if (ret < 0)
191                 return ret;
192 
193         /* This sucks ... */
194         target->thread.usp = regs->usp;
195         /* regs->retx = regs->pc; */
196 
197         return user_regset_copyin_ignore(&pos, &count, &kbuf, &ubuf,
198                                         PT_SYSCFG, -1);
199 }
200 
201 /*
202  * Define the register sets available on the Blackfin under Linux
203  */
204 enum bfin_regset {
205         REGSET_GENERAL,
206 };
207 
208 static const struct user_regset bfin_regsets[] = {
209         [REGSET_GENERAL] = {
210                 .core_note_type = NT_PRSTATUS,
211                 .n              = sizeof(struct pt_regs) / sizeof(long),
212                 .size           = sizeof(long),
213                 .align          = sizeof(long),
214                 .get            = genregs_get,
215                 .set            = genregs_set,
216         },
217 };
218 
219 static const struct user_regset_view user_bfin_native_view = {
220         .name      = "Blackfin",
221         .e_machine = EM_BLACKFIN,
222         .regsets   = bfin_regsets,
223         .n         = ARRAY_SIZE(bfin_regsets),
224 };
225 
226 const struct user_regset_view *task_user_regset_view(struct task_struct *task)
227 {
228         return &user_bfin_native_view;
229 }
230 
231 void user_enable_single_step(struct task_struct *child)
232 {
233         struct pt_regs *regs = task_pt_regs(child);
234         regs->syscfg |= SYSCFG_SSSTEP;
235 
236         set_tsk_thread_flag(child, TIF_SINGLESTEP);
237 }
238 
239 void user_disable_single_step(struct task_struct *child)
240 {
241         struct pt_regs *regs = task_pt_regs(child);
242         regs->syscfg &= ~SYSCFG_SSSTEP;
243 
244         clear_tsk_thread_flag(child, TIF_SINGLESTEP);
245 }
246 
247 long arch_ptrace(struct task_struct *child, long request,
248                  unsigned long addr, unsigned long data)
249 {
250         int ret;
251         unsigned long __user *datap = (unsigned long __user *)data;
252         void *paddr = (void *)addr;
253 
254         switch (request) {
255                 /* when I and D space are separate, these will need to be fixed. */
256         case PTRACE_PEEKDATA:
257                 pr_debug("ptrace: PEEKDATA\n");
258                 /* fall through */
259         case PTRACE_PEEKTEXT:   /* read word at location addr. */
260                 {
261                         unsigned long tmp = 0;
262                         int copied = 0, to_copy = sizeof(tmp);
263 
264                         ret = -EIO;
265                         pr_debug("ptrace: PEEKTEXT at addr 0x%08lx + %i\n", addr, to_copy);
266                         if (is_user_addr_valid(child, addr, to_copy) < 0)
267                                 break;
268                         pr_debug("ptrace: user address is valid\n");
269 
270                         switch (bfin_mem_access_type(addr, to_copy)) {
271                         case BFIN_MEM_ACCESS_CORE:
272                         case BFIN_MEM_ACCESS_CORE_ONLY:
273                                 copied = access_process_vm(child, addr, &tmp,
274                                                            to_copy, 0);
275                                 if (copied)
276                                         break;
277 
278                                 /* hrm, why didn't that work ... maybe no mapping */
279                                 if (addr >= FIXED_CODE_START &&
280                                     addr + to_copy <= FIXED_CODE_END) {
281                                         copy_from_user_page(0, 0, 0, &tmp, paddr, to_copy);
282                                         copied = to_copy;
283                                 } else if (addr >= BOOT_ROM_START) {
284                                         memcpy(&tmp, paddr, to_copy);
285                                         copied = to_copy;
286                                 }
287 
288                                 break;
289                         case BFIN_MEM_ACCESS_DMA:
290                                 if (safe_dma_memcpy(&tmp, paddr, to_copy))
291                                         copied = to_copy;
292                                 break;
293                         case BFIN_MEM_ACCESS_ITEST:
294                                 if (isram_memcpy(&tmp, paddr, to_copy))
295                                         copied = to_copy;
296                                 break;
297                         default:
298                                 copied = 0;
299                                 break;
300                         }
301 
302                         pr_debug("ptrace: copied size %d [0x%08lx]\n", copied, tmp);
303                         if (copied == to_copy)
304                                 ret = put_user(tmp, datap);
305                         break;
306                 }
307 
308                 /* when I and D space are separate, this will have to be fixed. */
309         case PTRACE_POKEDATA:
310                 pr_debug("ptrace: PTRACE_PEEKDATA\n");
311                 /* fall through */
312         case PTRACE_POKETEXT:   /* write the word at location addr. */
313                 {
314                         int copied = 0, to_copy = sizeof(data);
315 
316                         ret = -EIO;
317                         pr_debug("ptrace: POKETEXT at addr 0x%08lx + %i bytes %lx\n",
318                                  addr, to_copy, data);
319                         if (is_user_addr_valid(child, addr, to_copy) < 0)
320                                 break;
321                         pr_debug("ptrace: user address is valid\n");
322 
323                         switch (bfin_mem_access_type(addr, to_copy)) {
324                         case BFIN_MEM_ACCESS_CORE:
325                         case BFIN_MEM_ACCESS_CORE_ONLY:
326                                 copied = access_process_vm(child, addr, &data,
327                                                            to_copy, 1);
328                                 break;
329                         case BFIN_MEM_ACCESS_DMA:
330                                 if (safe_dma_memcpy(paddr, &data, to_copy))
331                                         copied = to_copy;
332                                 break;
333                         case BFIN_MEM_ACCESS_ITEST:
334                                 if (isram_memcpy(paddr, &data, to_copy))
335                                         copied = to_copy;
336                                 break;
337                         default:
338                                 copied = 0;
339                                 break;
340                         }
341 
342                         pr_debug("ptrace: copied size %d\n", copied);
343                         if (copied == to_copy)
344                                 ret = 0;
345                         break;
346                 }
347 
348         case PTRACE_PEEKUSR:
349                 switch (addr) {
350 #ifdef CONFIG_BINFMT_ELF_FDPIC  /* backwards compat */
351                 case PT_FDPIC_EXEC:
352                         request = PTRACE_GETFDPIC;
353                         addr = PTRACE_GETFDPIC_EXEC;
354                         goto case_default;
355                 case PT_FDPIC_INTERP:
356                         request = PTRACE_GETFDPIC;
357                         addr = PTRACE_GETFDPIC_INTERP;
358                         goto case_default;
359 #endif
360                 default:
361                         ret = get_reg(child, addr, datap);
362                 }
363                 pr_debug("ptrace: PEEKUSR reg %li with %#lx = %i\n", addr, data, ret);
364                 break;
365 
366         case PTRACE_POKEUSR:
367                 ret = put_reg(child, addr, data);
368                 pr_debug("ptrace: POKEUSR reg %li with %li = %i\n", addr, data, ret);
369                 break;
370 
371         case PTRACE_GETREGS:
372                 pr_debug("ptrace: PTRACE_GETREGS\n");
373                 return copy_regset_to_user(child, &user_bfin_native_view,
374                                            REGSET_GENERAL,
375                                            0, sizeof(struct pt_regs),
376                                            datap);
377 
378         case PTRACE_SETREGS:
379                 pr_debug("ptrace: PTRACE_SETREGS\n");
380                 return copy_regset_from_user(child, &user_bfin_native_view,
381                                              REGSET_GENERAL,
382                                              0, sizeof(struct pt_regs),
383                                              datap);
384 
385         case_default:
386         default:
387                 ret = ptrace_request(child, request, addr, data);
388                 break;
389         }
390 
391         return ret;
392 }
393 
394 asmlinkage int syscall_trace_enter(struct pt_regs *regs)
395 {
396         int ret = 0;
397 
398         if (test_thread_flag(TIF_SYSCALL_TRACE))
399                 ret = tracehook_report_syscall_entry(regs);
400 
401         return ret;
402 }
403 
404 asmlinkage void syscall_trace_leave(struct pt_regs *regs)
405 {
406         int step;
407 
408         step = test_thread_flag(TIF_SINGLESTEP);
409         if (step || test_thread_flag(TIF_SYSCALL_TRACE))
410                 tracehook_report_syscall_exit(regs, step);
411 }
412 

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