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Linux/arch/powerpc/kernel/ptrace32.c

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  1 /*
  2  * ptrace for 32-bit processes running on a 64-bit kernel.
  3  *
  4  *  PowerPC version
  5  *    Copyright (C) 1995-1996 Gary Thomas (gdt@linuxppc.org)
  6  *
  7  *  Derived from "arch/m68k/kernel/ptrace.c"
  8  *  Copyright (C) 1994 by Hamish Macdonald
  9  *  Taken from linux/kernel/ptrace.c and modified for M680x0.
 10  *  linux/kernel/ptrace.c is by Ross Biro 1/23/92, edited by Linus Torvalds
 11  *
 12  * Modified by Cort Dougan (cort@hq.fsmlabs.com)
 13  * and Paul Mackerras (paulus@samba.org).
 14  *
 15  * This file is subject to the terms and conditions of the GNU General
 16  * Public License.  See the file COPYING in the main directory of
 17  * this archive for more details.
 18  */
 19 
 20 #include <linux/kernel.h>
 21 #include <linux/sched.h>
 22 #include <linux/mm.h>
 23 #include <linux/smp.h>
 24 #include <linux/errno.h>
 25 #include <linux/ptrace.h>
 26 #include <linux/regset.h>
 27 #include <linux/user.h>
 28 #include <linux/security.h>
 29 #include <linux/signal.h>
 30 #include <linux/compat.h>
 31 
 32 #include <asm/uaccess.h>
 33 #include <asm/page.h>
 34 #include <asm/pgtable.h>
 35 #include <asm/switch_to.h>
 36 
 37 /*
 38  * does not yet catch signals sent when the child dies.
 39  * in exit.c or in signal.c.
 40  */
 41 
 42 /* Macros to workout the correct index for the FPR in the thread struct */
 43 #define FPRNUMBER(i) (((i) - PT_FPR0) >> 1)
 44 #define FPRHALF(i) (((i) - PT_FPR0) & 1)
 45 #define FPRINDEX(i) TS_FPRWIDTH * FPRNUMBER(i) * 2 + FPRHALF(i)
 46 
 47 long compat_arch_ptrace(struct task_struct *child, compat_long_t request,
 48                         compat_ulong_t caddr, compat_ulong_t cdata)
 49 {
 50         unsigned long addr = caddr;
 51         unsigned long data = cdata;
 52         int ret;
 53 
 54         switch (request) {
 55         /*
 56          * Read 4 bytes of the other process' storage
 57          *  data is a pointer specifying where the user wants the
 58          *      4 bytes copied into
 59          *  addr is a pointer in the user's storage that contains an 8 byte
 60          *      address in the other process of the 4 bytes that is to be read
 61          * (this is run in a 32-bit process looking at a 64-bit process)
 62          * when I and D space are separate, these will need to be fixed.
 63          */
 64         case PPC_PTRACE_PEEKTEXT_3264:
 65         case PPC_PTRACE_PEEKDATA_3264: {
 66                 u32 tmp;
 67                 int copied;
 68                 u32 __user * addrOthers;
 69 
 70                 ret = -EIO;
 71 
 72                 /* Get the addr in the other process that we want to read */
 73                 if (get_user(addrOthers, (u32 __user * __user *)addr) != 0)
 74                         break;
 75 
 76                 copied = access_process_vm(child, (u64)addrOthers, &tmp,
 77                                 sizeof(tmp), 0);
 78                 if (copied != sizeof(tmp))
 79                         break;
 80                 ret = put_user(tmp, (u32 __user *)data);
 81                 break;
 82         }
 83 
 84         /* Read a register (specified by ADDR) out of the "user area" */
 85         case PTRACE_PEEKUSR: {
 86                 int index;
 87                 unsigned long tmp;
 88 
 89                 ret = -EIO;
 90                 /* convert to index and check */
 91                 index = (unsigned long) addr >> 2;
 92                 if ((addr & 3) || (index > PT_FPSCR32))
 93                         break;
 94 
 95                 CHECK_FULL_REGS(child->thread.regs);
 96                 if (index < PT_FPR0) {
 97                         ret = ptrace_get_reg(child, index, &tmp);
 98                         if (ret)
 99                                 break;
100                 } else {
101                         flush_fp_to_thread(child);
102                         /*
103                          * the user space code considers the floating point
104                          * to be an array of unsigned int (32 bits) - the
105                          * index passed in is based on this assumption.
106                          */
107                         tmp = ((unsigned int *)child->thread.fp_state.fpr)
108                                 [FPRINDEX(index)];
109                 }
110                 ret = put_user((unsigned int)tmp, (u32 __user *)data);
111                 break;
112         }
113   
114         /*
115          * Read 4 bytes out of the other process' pt_regs area
116          *  data is a pointer specifying where the user wants the
117          *      4 bytes copied into
118          *  addr is the offset into the other process' pt_regs structure
119          *      that is to be read
120          * (this is run in a 32-bit process looking at a 64-bit process)
121          */
122         case PPC_PTRACE_PEEKUSR_3264: {
123                 u32 index;
124                 u32 reg32bits;
125                 u64 tmp;
126                 u32 numReg;
127                 u32 part;
128 
129                 ret = -EIO;
130                 /* Determine which register the user wants */
131                 index = (u64)addr >> 2;
132                 numReg = index / 2;
133                 /* Determine which part of the register the user wants */
134                 if (index % 2)
135                         part = 1;  /* want the 2nd half of the register (right-most). */
136                 else
137                         part = 0;  /* want the 1st half of the register (left-most). */
138 
139                 /* Validate the input - check to see if address is on the wrong boundary
140                  * or beyond the end of the user area
141                  */
142                 if ((addr & 3) || numReg > PT_FPSCR)
143                         break;
144 
145                 CHECK_FULL_REGS(child->thread.regs);
146                 if (numReg >= PT_FPR0) {
147                         flush_fp_to_thread(child);
148                         /* get 64 bit FPR */
149                         tmp = child->thread.fp_state.fpr[numReg - PT_FPR0][0];
150                 } else { /* register within PT_REGS struct */
151                         unsigned long tmp2;
152                         ret = ptrace_get_reg(child, numReg, &tmp2);
153                         if (ret)
154                                 break;
155                         tmp = tmp2;
156                 } 
157                 reg32bits = ((u32*)&tmp)[part];
158                 ret = put_user(reg32bits, (u32 __user *)data);
159                 break;
160         }
161 
162         /*
163          * Write 4 bytes into the other process' storage
164          *  data is the 4 bytes that the user wants written
165          *  addr is a pointer in the user's storage that contains an
166          *      8 byte address in the other process where the 4 bytes
167          *      that is to be written
168          * (this is run in a 32-bit process looking at a 64-bit process)
169          * when I and D space are separate, these will need to be fixed.
170          */
171         case PPC_PTRACE_POKETEXT_3264:
172         case PPC_PTRACE_POKEDATA_3264: {
173                 u32 tmp = data;
174                 u32 __user * addrOthers;
175 
176                 /* Get the addr in the other process that we want to write into */
177                 ret = -EIO;
178                 if (get_user(addrOthers, (u32 __user * __user *)addr) != 0)
179                         break;
180                 ret = 0;
181                 if (access_process_vm(child, (u64)addrOthers, &tmp,
182                                         sizeof(tmp), 1) == sizeof(tmp))
183                         break;
184                 ret = -EIO;
185                 break;
186         }
187 
188         /* write the word at location addr in the USER area */
189         case PTRACE_POKEUSR: {
190                 unsigned long index;
191 
192                 ret = -EIO;
193                 /* convert to index and check */
194                 index = (unsigned long) addr >> 2;
195                 if ((addr & 3) || (index > PT_FPSCR32))
196                         break;
197 
198                 CHECK_FULL_REGS(child->thread.regs);
199                 if (index < PT_FPR0) {
200                         ret = ptrace_put_reg(child, index, data);
201                 } else {
202                         flush_fp_to_thread(child);
203                         /*
204                          * the user space code considers the floating point
205                          * to be an array of unsigned int (32 bits) - the
206                          * index passed in is based on this assumption.
207                          */
208                         ((unsigned int *)child->thread.fp_state.fpr)
209                                 [FPRINDEX(index)] = data;
210                         ret = 0;
211                 }
212                 break;
213         }
214 
215         /*
216          * Write 4 bytes into the other process' pt_regs area
217          *  data is the 4 bytes that the user wants written
218          *  addr is the offset into the other process' pt_regs structure
219          *      that is to be written into
220          * (this is run in a 32-bit process looking at a 64-bit process)
221          */
222         case PPC_PTRACE_POKEUSR_3264: {
223                 u32 index;
224                 u32 numReg;
225 
226                 ret = -EIO;
227                 /* Determine which register the user wants */
228                 index = (u64)addr >> 2;
229                 numReg = index / 2;
230 
231                 /*
232                  * Validate the input - check to see if address is on the
233                  * wrong boundary or beyond the end of the user area
234                  */
235                 if ((addr & 3) || (numReg > PT_FPSCR))
236                         break;
237                 CHECK_FULL_REGS(child->thread.regs);
238                 if (numReg < PT_FPR0) {
239                         unsigned long freg;
240                         ret = ptrace_get_reg(child, numReg, &freg);
241                         if (ret)
242                                 break;
243                         if (index % 2)
244                                 freg = (freg & ~0xfffffffful) | (data & 0xfffffffful);
245                         else
246                                 freg = (freg & 0xfffffffful) | (data << 32);
247                         ret = ptrace_put_reg(child, numReg, freg);
248                 } else {
249                         u64 *tmp;
250                         flush_fp_to_thread(child);
251                         /* get 64 bit FPR ... */
252                         tmp = &child->thread.fp_state.fpr[numReg - PT_FPR0][0];
253                         /* ... write the 32 bit part we want */
254                         ((u32 *)tmp)[index % 2] = data;
255                         ret = 0;
256                 }
257                 break;
258         }
259 
260         case PTRACE_GET_DEBUGREG: {
261 #ifndef CONFIG_PPC_ADV_DEBUG_REGS
262                 unsigned long dabr_fake;
263 #endif
264                 ret = -EINVAL;
265                 /* We only support one DABR and no IABRS at the moment */
266                 if (addr > 0)
267                         break;
268 #ifdef CONFIG_PPC_ADV_DEBUG_REGS
269                 ret = put_user(child->thread.debug.dac1, (u32 __user *)data);
270 #else
271                 dabr_fake = (
272                         (child->thread.hw_brk.address & (~HW_BRK_TYPE_DABR)) |
273                         (child->thread.hw_brk.type & HW_BRK_TYPE_DABR));
274                 ret = put_user(dabr_fake, (u32 __user *)data);
275 #endif
276                 break;
277         }
278 
279         case PTRACE_GETREGS:    /* Get all pt_regs from the child. */
280                 return copy_regset_to_user(
281                         child, task_user_regset_view(current), 0,
282                         0, PT_REGS_COUNT * sizeof(compat_long_t),
283                         compat_ptr(data));
284 
285         case PTRACE_SETREGS:    /* Set all gp regs in the child. */
286                 return copy_regset_from_user(
287                         child, task_user_regset_view(current), 0,
288                         0, PT_REGS_COUNT * sizeof(compat_long_t),
289                         compat_ptr(data));
290 
291         case PTRACE_GETFPREGS:
292         case PTRACE_SETFPREGS:
293         case PTRACE_GETVRREGS:
294         case PTRACE_SETVRREGS:
295         case PTRACE_GETVSRREGS:
296         case PTRACE_SETVSRREGS:
297         case PTRACE_GETREGS64:
298         case PTRACE_SETREGS64:
299         case PTRACE_KILL:
300         case PTRACE_SINGLESTEP:
301         case PTRACE_DETACH:
302         case PTRACE_SET_DEBUGREG:
303         case PTRACE_SYSCALL:
304         case PTRACE_CONT:
305         case PPC_PTRACE_GETHWDBGINFO:
306         case PPC_PTRACE_SETHWDEBUG:
307         case PPC_PTRACE_DELHWDEBUG:
308                 ret = arch_ptrace(child, request, addr, data);
309                 break;
310 
311         default:
312                 ret = compat_ptrace_request(child, request, addr, data);
313                 break;
314         }
315 
316         return ret;
317 }
318 

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