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Linux/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/errno.h>
 18 #include <linux/ptrace.h>
 19 #include <linux/user.h>
 20 #include <linux/signal.h>
 21 #include <linux/tracehook.h>
 22 
 23 #include <asm/uaccess.h>
 24 #include <asm/page.h>
 25 #include <asm/pgtable.h>
 26 #include <asm/processor.h>
 27 
 28 /*
 29  * does not yet catch signals sent when the child dies.
 30  * in exit.c or in signal.c.
 31  */
 32 
 33 /* determines which bits in the SR the user has access to. */
 34 /* 1 = access 0 = no access */
 35 #define SR_MASK 0x001f
 36 
 37 /* sets the trace bits. */
 38 #define TRACE_BITS 0xC000
 39 #define T1_BIT 0x8000
 40 #define T0_BIT 0x4000
 41 
 42 /* Find the stack offset for a register, relative to thread.esp0. */
 43 #define PT_REG(reg)     ((long)&((struct pt_regs *)0)->reg)
 44 #define SW_REG(reg)     ((long)&((struct switch_stack *)0)->reg \
 45                          - sizeof(struct switch_stack))
 46 /* Mapping from PT_xxx to the stack offset at which the register is
 47    saved.  Notice that usp has no stack-slot and needs to be treated
 48    specially (see get_reg/put_reg below). */
 49 static const int regoff[] = {
 50         [0]     = PT_REG(d1),
 51         [1]     = PT_REG(d2),
 52         [2]     = PT_REG(d3),
 53         [3]     = PT_REG(d4),
 54         [4]     = PT_REG(d5),
 55         [5]     = SW_REG(d6),
 56         [6]     = SW_REG(d7),
 57         [7]     = PT_REG(a0),
 58         [8]     = PT_REG(a1),
 59         [9]     = PT_REG(a2),
 60         [10]    = SW_REG(a3),
 61         [11]    = SW_REG(a4),
 62         [12]    = SW_REG(a5),
 63         [13]    = SW_REG(a6),
 64         [14]    = PT_REG(d0),
 65         [15]    = -1,
 66         [16]    = PT_REG(orig_d0),
 67         [17]    = PT_REG(sr),
 68         [18]    = PT_REG(pc),
 69 };
 70 
 71 /*
 72  * Get contents of register REGNO in task TASK.
 73  */
 74 static inline long get_reg(struct task_struct *task, int regno)
 75 {
 76         unsigned long *addr;
 77 
 78         if (regno == PT_USP)
 79                 addr = &task->thread.usp;
 80         else if (regno < ARRAY_SIZE(regoff))
 81                 addr = (unsigned long *)(task->thread.esp0 + regoff[regno]);
 82         else
 83                 return 0;
 84         /* Need to take stkadj into account. */
 85         if (regno == PT_SR || regno == PT_PC) {
 86                 long stkadj = *(long *)(task->thread.esp0 + PT_REG(stkadj));
 87                 addr = (unsigned long *) ((unsigned long)addr + stkadj);
 88                 /* The sr is actually a 16 bit register.  */
 89                 if (regno == PT_SR)
 90                         return *(unsigned short *)addr;
 91         }
 92         return *addr;
 93 }
 94 
 95 /*
 96  * Write contents of register REGNO in task TASK.
 97  */
 98 static inline int put_reg(struct task_struct *task, int regno,
 99                           unsigned long data)
100 {
101         unsigned long *addr;
102 
103         if (regno == PT_USP)
104                 addr = &task->thread.usp;
105         else if (regno < ARRAY_SIZE(regoff))
106                 addr = (unsigned long *)(task->thread.esp0 + regoff[regno]);
107         else
108                 return -1;
109         /* Need to take stkadj into account. */
110         if (regno == PT_SR || regno == PT_PC) {
111                 long stkadj = *(long *)(task->thread.esp0 + PT_REG(stkadj));
112                 addr = (unsigned long *) ((unsigned long)addr + stkadj);
113                 /* The sr is actually a 16 bit register.  */
114                 if (regno == PT_SR) {
115                         *(unsigned short *)addr = data;
116                         return 0;
117                 }
118         }
119         *addr = data;
120         return 0;
121 }
122 
123 /*
124  * Make sure the single step bit is not set.
125  */
126 static inline void singlestep_disable(struct task_struct *child)
127 {
128         unsigned long tmp = get_reg(child, PT_SR) & ~TRACE_BITS;
129         put_reg(child, PT_SR, tmp);
130         clear_tsk_thread_flag(child, TIF_DELAYED_TRACE);
131 }
132 
133 /*
134  * Called by kernel/ptrace.c when detaching..
135  */
136 void ptrace_disable(struct task_struct *child)
137 {
138         singlestep_disable(child);
139 }
140 
141 void user_enable_single_step(struct task_struct *child)
142 {
143         unsigned long tmp = get_reg(child, PT_SR) & ~TRACE_BITS;
144         put_reg(child, PT_SR, tmp | T1_BIT);
145         set_tsk_thread_flag(child, TIF_DELAYED_TRACE);
146 }
147 
148 #ifdef CONFIG_MMU
149 void user_enable_block_step(struct task_struct *child)
150 {
151         unsigned long tmp = get_reg(child, PT_SR) & ~TRACE_BITS;
152         put_reg(child, PT_SR, tmp | T0_BIT);
153 }
154 #endif
155 
156 void user_disable_single_step(struct task_struct *child)
157 {
158         singlestep_disable(child);
159 }
160 
161 long arch_ptrace(struct task_struct *child, long request,
162                  unsigned long addr, unsigned long data)
163 {
164         unsigned long tmp;
165         int i, ret = 0;
166         int regno = addr >> 2; /* temporary hack. */
167         unsigned long __user *datap = (unsigned long __user *) data;
168 
169         switch (request) {
170         /* read the word at location addr in the USER area. */
171         case PTRACE_PEEKUSR:
172                 if (addr & 3)
173                         goto out_eio;
174 
175                 if (regno >= 0 && regno < 19) {
176                         tmp = get_reg(child, regno);
177                 } else if (regno >= 21 && regno < 49) {
178                         tmp = child->thread.fp[regno - 21];
179                         /* Convert internal fpu reg representation
180                          * into long double format
181                          */
182                         if (FPU_IS_EMU && (regno < 45) && !(regno % 3))
183                                 tmp = ((tmp & 0xffff0000) << 15) |
184                                       ((tmp & 0x0000ffff) << 16);
185 #ifndef CONFIG_MMU
186                 } else if (regno == 49) {
187                         tmp = child->mm->start_code;
188                 } else if (regno == 50) {
189                         tmp = child->mm->start_data;
190                 } else if (regno == 51) {
191                         tmp = child->mm->end_code;
192 #endif
193                 } else
194                         goto out_eio;
195                 ret = put_user(tmp, datap);
196                 break;
197 
198         case PTRACE_POKEUSR:
199         /* write the word at location addr in the USER area */
200                 if (addr & 3)
201                         goto out_eio;
202 
203                 if (regno == PT_SR) {
204                         data &= SR_MASK;
205                         data |= get_reg(child, PT_SR) & ~SR_MASK;
206                 }
207                 if (regno >= 0 && regno < 19) {
208                         if (put_reg(child, regno, data))
209                                 goto out_eio;
210                 } else if (regno >= 21 && regno < 48) {
211                         /* Convert long double format
212                          * into internal fpu reg representation
213                          */
214                         if (FPU_IS_EMU && (regno < 45) && !(regno % 3)) {
215                                 data <<= 15;
216                                 data = (data & 0xffff0000) |
217                                        ((data & 0x0000ffff) >> 1);
218                         }
219                         child->thread.fp[regno - 21] = data;
220                 } else
221                         goto out_eio;
222                 break;
223 
224         case PTRACE_GETREGS:    /* Get all gp regs from the child. */
225                 for (i = 0; i < 19; i++) {
226                         tmp = get_reg(child, i);
227                         ret = put_user(tmp, datap);
228                         if (ret)
229                                 break;
230                         datap++;
231                 }
232                 break;
233 
234         case PTRACE_SETREGS:    /* Set all gp regs in the child. */
235                 for (i = 0; i < 19; i++) {
236                         ret = get_user(tmp, datap);
237                         if (ret)
238                                 break;
239                         if (i == PT_SR) {
240                                 tmp &= SR_MASK;
241                                 tmp |= get_reg(child, PT_SR) & ~SR_MASK;
242                         }
243                         put_reg(child, i, tmp);
244                         datap++;
245                 }
246                 break;
247 
248         case PTRACE_GETFPREGS:  /* Get the child FPU state. */
249                 if (copy_to_user(datap, &child->thread.fp,
250                                  sizeof(struct user_m68kfp_struct)))
251                         ret = -EFAULT;
252                 break;
253 
254         case PTRACE_SETFPREGS:  /* Set the child FPU state. */
255                 if (copy_from_user(&child->thread.fp, datap,
256                                    sizeof(struct user_m68kfp_struct)))
257                         ret = -EFAULT;
258                 break;
259 
260         case PTRACE_GET_THREAD_AREA:
261                 ret = put_user(task_thread_info(child)->tp_value, datap);
262                 break;
263 
264         default:
265                 ret = ptrace_request(child, request, addr, data);
266                 break;
267         }
268 
269         return ret;
270 out_eio:
271         return -EIO;
272 }
273 
274 asmlinkage void syscall_trace(void)
275 {
276         ptrace_notify(SIGTRAP | ((current->ptrace & PT_TRACESYSGOOD)
277                                  ? 0x80 : 0));
278         /*
279          * this isn't the same as continuing with a signal, but it will do
280          * for normal use.  strace only continues with a signal if the
281          * stopping signal is not SIGTRAP.  -brl
282          */
283         if (current->exit_code) {
284                 send_sig(current->exit_code, current, 1);
285                 current->exit_code = 0;
286         }
287 }
288 
289 #if defined(CONFIG_COLDFIRE) || !defined(CONFIG_MMU)
290 asmlinkage int syscall_trace_enter(void)
291 {
292         int ret = 0;
293 
294         if (test_thread_flag(TIF_SYSCALL_TRACE))
295                 ret = tracehook_report_syscall_entry(task_pt_regs(current));
296         return ret;
297 }
298 
299 asmlinkage void syscall_trace_leave(void)
300 {
301         if (test_thread_flag(TIF_SYSCALL_TRACE))
302                 tracehook_report_syscall_exit(task_pt_regs(current), 0);
303 }
304 #endif /* CONFIG_COLDFIRE */
305 

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