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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/sched/task_stack.h>
 16 #include <linux/mm.h>
 17 #include <linux/smp.h>
 18 #include <linux/errno.h>
 19 #include <linux/ptrace.h>
 20 #include <linux/user.h>
 21 #include <linux/signal.h>
 22 #include <linux/tracehook.h>
 23 
 24 #include <linux/uaccess.h>
 25 #include <asm/page.h>
 26 #include <asm/pgtable.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 0xC000
 40 #define T1_BIT 0x8000
 41 #define T0_BIT 0x4000
 42 
 43 /* Find the stack offset for a register, relative to thread.esp0. */
 44 #define PT_REG(reg)     ((long)&((struct pt_regs *)0)->reg)
 45 #define SW_REG(reg)     ((long)&((struct switch_stack *)0)->reg \
 46                          - sizeof(struct switch_stack))
 47 /* Mapping from PT_xxx to the stack offset at which the register is
 48    saved.  Notice that usp has no stack-slot and needs to be treated
 49    specially (see get_reg/put_reg below). */
 50 static const int regoff[] = {
 51         [0]     = PT_REG(d1),
 52         [1]     = PT_REG(d2),
 53         [2]     = PT_REG(d3),
 54         [3]     = PT_REG(d4),
 55         [4]     = PT_REG(d5),
 56         [5]     = SW_REG(d6),
 57         [6]     = SW_REG(d7),
 58         [7]     = PT_REG(a0),
 59         [8]     = PT_REG(a1),
 60         [9]     = PT_REG(a2),
 61         [10]    = SW_REG(a3),
 62         [11]    = SW_REG(a4),
 63         [12]    = SW_REG(a5),
 64         [13]    = SW_REG(a6),
 65         [14]    = PT_REG(d0),
 66         [15]    = -1,
 67         [16]    = PT_REG(orig_d0),
 68         [17]    = PT_REG(sr),
 69         [18]    = PT_REG(pc),
 70 };
 71 
 72 /*
 73  * Get contents of register REGNO in task TASK.
 74  */
 75 static inline long get_reg(struct task_struct *task, int regno)
 76 {
 77         unsigned long *addr;
 78 
 79         if (regno == PT_USP)
 80                 addr = &task->thread.usp;
 81         else if (regno < ARRAY_SIZE(regoff))
 82                 addr = (unsigned long *)(task->thread.esp0 + regoff[regno]);
 83         else
 84                 return 0;
 85         /* Need to take stkadj into account. */
 86         if (regno == PT_SR || regno == PT_PC) {
 87                 long stkadj = *(long *)(task->thread.esp0 + PT_REG(stkadj));
 88                 addr = (unsigned long *) ((unsigned long)addr + stkadj);
 89                 /* The sr is actually a 16 bit register.  */
 90                 if (regno == PT_SR)
 91                         return *(unsigned short *)addr;
 92         }
 93         return *addr;
 94 }
 95 
 96 /*
 97  * Write contents of register REGNO in task TASK.
 98  */
 99 static inline int put_reg(struct task_struct *task, int regno,
100                           unsigned long data)
101 {
102         unsigned long *addr;
103 
104         if (regno == PT_USP)
105                 addr = &task->thread.usp;
106         else if (regno < ARRAY_SIZE(regoff))
107                 addr = (unsigned long *)(task->thread.esp0 + regoff[regno]);
108         else
109                 return -1;
110         /* Need to take stkadj into account. */
111         if (regno == PT_SR || regno == PT_PC) {
112                 long stkadj = *(long *)(task->thread.esp0 + PT_REG(stkadj));
113                 addr = (unsigned long *) ((unsigned long)addr + stkadj);
114                 /* The sr is actually a 16 bit register.  */
115                 if (regno == PT_SR) {
116                         *(unsigned short *)addr = data;
117                         return 0;
118                 }
119         }
120         *addr = data;
121         return 0;
122 }
123 
124 /*
125  * Make sure the single step bit is not set.
126  */
127 static inline void singlestep_disable(struct task_struct *child)
128 {
129         unsigned long tmp = get_reg(child, PT_SR) & ~TRACE_BITS;
130         put_reg(child, PT_SR, tmp);
131         clear_tsk_thread_flag(child, TIF_DELAYED_TRACE);
132 }
133 
134 /*
135  * Called by kernel/ptrace.c when detaching..
136  */
137 void ptrace_disable(struct task_struct *child)
138 {
139         singlestep_disable(child);
140 }
141 
142 void user_enable_single_step(struct task_struct *child)
143 {
144         unsigned long tmp = get_reg(child, PT_SR) & ~TRACE_BITS;
145         put_reg(child, PT_SR, tmp | T1_BIT);
146         set_tsk_thread_flag(child, TIF_DELAYED_TRACE);
147 }
148 
149 #ifdef CONFIG_MMU
150 void user_enable_block_step(struct task_struct *child)
151 {
152         unsigned long tmp = get_reg(child, PT_SR) & ~TRACE_BITS;
153         put_reg(child, PT_SR, tmp | T0_BIT);
154 }
155 #endif
156 
157 void user_disable_single_step(struct task_struct *child)
158 {
159         singlestep_disable(child);
160 }
161 
162 long arch_ptrace(struct task_struct *child, long request,
163                  unsigned long addr, unsigned long data)
164 {
165         unsigned long tmp;
166         int i, ret = 0;
167         int regno = addr >> 2; /* temporary hack. */
168         unsigned long __user *datap = (unsigned long __user *) data;
169 
170         switch (request) {
171         /* read the word at location addr in the USER area. */
172         case PTRACE_PEEKUSR:
173                 if (addr & 3)
174                         goto out_eio;
175 
176                 if (regno >= 0 && regno < 19) {
177                         tmp = get_reg(child, regno);
178                 } else if (regno >= 21 && regno < 49) {
179                         tmp = child->thread.fp[regno - 21];
180                         /* Convert internal fpu reg representation
181                          * into long double format
182                          */
183                         if (FPU_IS_EMU && (regno < 45) && !(regno % 3))
184                                 tmp = ((tmp & 0xffff0000) << 15) |
185                                       ((tmp & 0x0000ffff) << 16);
186 #ifndef CONFIG_MMU
187                 } else if (regno == 49) {
188                         tmp = child->mm->start_code;
189                 } else if (regno == 50) {
190                         tmp = child->mm->start_data;
191                 } else if (regno == 51) {
192                         tmp = child->mm->end_code;
193 #endif
194                 } else
195                         goto out_eio;
196                 ret = put_user(tmp, datap);
197                 break;
198 
199         case PTRACE_POKEUSR:
200         /* write the word at location addr in the USER area */
201                 if (addr & 3)
202                         goto out_eio;
203 
204                 if (regno == PT_SR) {
205                         data &= SR_MASK;
206                         data |= get_reg(child, PT_SR) & ~SR_MASK;
207                 }
208                 if (regno >= 0 && regno < 19) {
209                         if (put_reg(child, regno, data))
210                                 goto out_eio;
211                 } else if (regno >= 21 && regno < 48) {
212                         /* Convert long double format
213                          * into internal fpu reg representation
214                          */
215                         if (FPU_IS_EMU && (regno < 45) && !(regno % 3)) {
216                                 data <<= 15;
217                                 data = (data & 0xffff0000) |
218                                        ((data & 0x0000ffff) >> 1);
219                         }
220                         child->thread.fp[regno - 21] = data;
221                 } else
222                         goto out_eio;
223                 break;
224 
225         case PTRACE_GETREGS:    /* Get all gp regs from the child. */
226                 for (i = 0; i < 19; i++) {
227                         tmp = get_reg(child, i);
228                         ret = put_user(tmp, datap);
229                         if (ret)
230                                 break;
231                         datap++;
232                 }
233                 break;
234 
235         case PTRACE_SETREGS:    /* Set all gp regs in the child. */
236                 for (i = 0; i < 19; i++) {
237                         ret = get_user(tmp, datap);
238                         if (ret)
239                                 break;
240                         if (i == PT_SR) {
241                                 tmp &= SR_MASK;
242                                 tmp |= get_reg(child, PT_SR) & ~SR_MASK;
243                         }
244                         put_reg(child, i, tmp);
245                         datap++;
246                 }
247                 break;
248 
249         case PTRACE_GETFPREGS:  /* Get the child FPU state. */
250                 if (copy_to_user(datap, &child->thread.fp,
251                                  sizeof(struct user_m68kfp_struct)))
252                         ret = -EFAULT;
253                 break;
254 
255         case PTRACE_SETFPREGS:  /* Set the child FPU state. */
256                 if (copy_from_user(&child->thread.fp, datap,
257                                    sizeof(struct user_m68kfp_struct)))
258                         ret = -EFAULT;
259                 break;
260 
261         case PTRACE_GET_THREAD_AREA:
262                 ret = put_user(task_thread_info(child)->tp_value, datap);
263                 break;
264 
265         default:
266                 ret = ptrace_request(child, request, addr, data);
267                 break;
268         }
269 
270         return ret;
271 out_eio:
272         return -EIO;
273 }
274 
275 asmlinkage void syscall_trace(void)
276 {
277         ptrace_notify(SIGTRAP | ((current->ptrace & PT_TRACESYSGOOD)
278                                  ? 0x80 : 0));
279         /*
280          * this isn't the same as continuing with a signal, but it will do
281          * for normal use.  strace only continues with a signal if the
282          * stopping signal is not SIGTRAP.  -brl
283          */
284         if (current->exit_code) {
285                 send_sig(current->exit_code, current, 1);
286                 current->exit_code = 0;
287         }
288 }
289 
290 #if defined(CONFIG_COLDFIRE) || !defined(CONFIG_MMU)
291 asmlinkage int syscall_trace_enter(void)
292 {
293         int ret = 0;
294 
295         if (test_thread_flag(TIF_SYSCALL_TRACE))
296                 ret = tracehook_report_syscall_entry(task_pt_regs(current));
297         return ret;
298 }
299 
300 asmlinkage void syscall_trace_leave(void)
301 {
302         if (test_thread_flag(TIF_SYSCALL_TRACE))
303                 tracehook_report_syscall_exit(task_pt_regs(current), 0);
304 }
305 #endif /* CONFIG_COLDFIRE */
306 

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