h8300 entry.S update
[linux-2.6.git] / arch / h8300 / kernel / ptrace.c
1 /*
2  *  linux/arch/h8300/kernel/ptrace.c
3  *
4  *  Yoshinori Sato <ysato@users.sourceforge.jp>
5  *
6  *  Based on:
7  *  linux/arch/m68k/kernel/ptrace.c
8  *
9  *  Copyright (C) 1994 by Hamish Macdonald
10  *  Taken from linux/kernel/ptrace.c and modified for M680x0.
11  *  linux/kernel/ptrace.c is by Ross Biro 1/23/92, edited by Linus Torvalds
12  *
13  * This file is subject to the terms and conditions of the GNU General
14  * Public License.  See the file COPYING in the main directory of
15  * this archive for more details.
16  */
17
18 #include <linux/kernel.h>
19 #include <linux/sched.h>
20 #include <linux/mm.h>
21 #include <linux/smp.h>
22 #include <linux/errno.h>
23 #include <linux/ptrace.h>
24 #include <linux/user.h>
25 #include <linux/signal.h>
26
27 #include <asm/uaccess.h>
28 #include <asm/page.h>
29 #include <asm/pgtable.h>
30 #include <asm/system.h>
31 #include <asm/processor.h>
32 #include <asm/signal.h>
33
34 /* cpu depend functions */
35 extern long h8300_get_reg(struct task_struct *task, int regno);
36 extern int  h8300_put_reg(struct task_struct *task, int regno, unsigned long data);
37 extern void h8300_disable_trace(struct task_struct *child);
38 extern void h8300_enable_trace(struct task_struct *child);
39
40 /*
41  * does not yet catch signals sent when the child dies.
42  * in exit.c or in signal.c.
43  */
44
45 inline
46 static int read_long(struct task_struct * tsk, unsigned long addr,
47         unsigned long * result)
48 {
49         *result = *(unsigned long *)addr;
50         return 0;
51 }
52
53 void ptrace_disable(struct task_struct *child)
54 {
55         h8300_disable_trace(child);
56 }
57
58 long arch_ptrace(struct task_struct *child, long request, long addr, long data)
59 {
60         int ret;
61
62         switch (request) {
63                 case PTRACE_PEEKTEXT: /* read word at location addr. */ 
64                 case PTRACE_PEEKDATA: {
65                         unsigned long tmp;
66
67                         ret = read_long(child, addr, &tmp);
68                         if (ret < 0)
69                                 break ;
70                         ret = put_user(tmp, (unsigned long *) data);
71                         break ;
72                 }
73
74         /* read the word at location addr in the USER area. */
75                 case PTRACE_PEEKUSR: {
76                         unsigned long tmp = 0;
77                         
78                         if ((addr & 3) || addr < 0 || addr >= sizeof(struct user)) {
79                                 ret = -EIO;
80                                 break ;
81                         }
82                         
83                         ret = 0;  /* Default return condition */
84                         addr = addr >> 2; /* temporary hack. */
85
86                         if (addr < H8300_REGS_NO)
87                                 tmp = h8300_get_reg(child, addr);
88                         else {
89                                 switch(addr) {
90                                 case 49:
91                                         tmp = child->mm->start_code;
92                                         break ;
93                                 case 50:
94                                         tmp = child->mm->start_data;
95                                         break ;
96                                 case 51:
97                                         tmp = child->mm->end_code;
98                                         break ;
99                                 case 52:
100                                         tmp = child->mm->end_data;
101                                         break ;
102                                 default:
103                                         ret = -EIO;
104                                 }
105                         }
106                         if (!ret)
107                                 ret = put_user(tmp,(unsigned long *) data);
108                         break ;
109                 }
110
111       /* when I and D space are separate, this will have to be fixed. */
112                 case PTRACE_POKETEXT: /* write the word at location addr. */
113                 case PTRACE_POKEDATA:
114                         ret = 0;
115                         if (access_process_vm(child, addr, &data, sizeof(data), 1) == sizeof(data))
116                                 break;
117                         ret = -EIO;
118                         break;
119
120                 case PTRACE_POKEUSR: /* write the word at location addr in the USER area */
121                         if ((addr & 3) || addr < 0 || addr >= sizeof(struct user)) {
122                                 ret = -EIO;
123                                 break ;
124                         }
125                         addr = addr >> 2; /* temporary hack. */
126                             
127                         if (addr == PT_ORIG_ER0) {
128                                 ret = -EIO;
129                                 break ;
130                         }
131                         if (addr < H8300_REGS_NO) {
132                                 ret = h8300_put_reg(child, addr, data);
133                                 break ;
134                         }
135                         ret = -EIO;
136                         break ;
137                 case PTRACE_SYSCALL: /* continue and stop at next (return from) syscall */
138                 case PTRACE_CONT: { /* restart after signal. */
139                         ret = -EIO;
140                         if (!valid_signal(data))
141                                 break ;
142                         if (request == PTRACE_SYSCALL)
143                                 set_tsk_thread_flag(child, TIF_SYSCALL_TRACE);
144                         else
145                                 clear_tsk_thread_flag(child, TIF_SYSCALL_TRACE);
146                         child->exit_code = data;
147                         wake_up_process(child);
148                         /* make sure the single step bit is not set. */
149                         h8300_disable_trace(child);
150                         ret = 0;
151                 }
152
153 /*
154  * make the child exit.  Best I can do is send it a sigkill. 
155  * perhaps it should be put in the status that it wants to 
156  * exit.
157  */
158                 case PTRACE_KILL: {
159
160                         ret = 0;
161                         if (child->exit_state == EXIT_ZOMBIE) /* already dead */
162                                 break;
163                         child->exit_code = SIGKILL;
164                         h8300_disable_trace(child);
165                         wake_up_process(child);
166                         break;
167                 }
168
169                 case PTRACE_SINGLESTEP: {  /* set the trap flag. */
170                         ret = -EIO;
171                         if (!valid_signal(data))
172                                 break;
173                         clear_tsk_thread_flag(child, TIF_SYSCALL_TRACE);
174                         child->exit_code = data;
175                         h8300_enable_trace(child);
176                         wake_up_process(child);
177                         ret = 0;
178                         break;
179                 }
180
181                 case PTRACE_DETACH:     /* detach a process that was attached. */
182                         ret = ptrace_detach(child, data);
183                         break;
184
185                 case PTRACE_GETREGS: { /* Get all gp regs from the child. */
186                         int i;
187                         unsigned long tmp;
188                         for (i = 0; i < H8300_REGS_NO; i++) {
189                             tmp = h8300_get_reg(child, i);
190                             if (put_user(tmp, (unsigned long *) data)) {
191                                 ret = -EFAULT;
192                                 break;
193                             }
194                             data += sizeof(long);
195                         }
196                         ret = 0;
197                         break;
198                 }
199
200                 case PTRACE_SETREGS: { /* Set all gp regs in the child. */
201                         int i;
202                         unsigned long tmp;
203                         for (i = 0; i < H8300_REGS_NO; i++) {
204                             if (get_user(tmp, (unsigned long *) data)) {
205                                 ret = -EFAULT;
206                                 break;
207                             }
208                             h8300_put_reg(child, i, tmp);
209                             data += sizeof(long);
210                         }
211                         ret = 0;
212                         break;
213                 }
214
215                 default:
216                         ret = -EIO;
217                         break;
218         }
219         return ret;
220 }
221
222 asmlinkage void do_syscall_trace(void)
223 {
224         if (!test_thread_flag(TIF_SYSCALL_TRACE))
225                 return;
226         if (!(current->ptrace & PT_PTRACED))
227                 return;
228         ptrace_notify(SIGTRAP | ((current->ptrace & PT_TRACESYSGOOD)
229                                  ? 0x80 : 0));
230         /*
231          * this isn't the same as continuing with a signal, but it will do
232          * for normal use.  strace only continues with a signal if the
233          * stopping signal is not SIGTRAP.  -brl
234          */
235         if (current->exit_code) {
236                 send_sig(current->exit_code, current, 1);
237                 current->exit_code = 0;
238         }
239 }