[PATCH] irq-flags: H8300: Use the new IRQF_ constants
[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/smp_lock.h>
23 #include <linux/errno.h>
24 #include <linux/ptrace.h>
25 #include <linux/user.h>
26 #include <linux/signal.h>
27
28 #include <asm/uaccess.h>
29 #include <asm/page.h>
30 #include <asm/pgtable.h>
31 #include <asm/system.h>
32 #include <asm/processor.h>
33 #include <asm/signal.h>
34
35 /* cpu depend functions */
36 extern long h8300_get_reg(struct task_struct *task, int regno);
37 extern int  h8300_put_reg(struct task_struct *task, int regno, unsigned long data);
38 extern void h8300_disable_trace(struct task_struct *child);
39 extern void h8300_enable_trace(struct task_struct *child);
40
41 /*
42  * does not yet catch signals sent when the child dies.
43  * in exit.c or in signal.c.
44  */
45
46 inline
47 static int read_long(struct task_struct * tsk, unsigned long addr,
48         unsigned long * result)
49 {
50         *result = *(unsigned long *)addr;
51         return 0;
52 }
53
54 void ptrace_disable(struct task_struct *child)
55 {
56         h8300_disable_trace(child);
57 }
58
59 long arch_ptrace(struct task_struct *child, long request, long addr, long data)
60 {
61         int ret;
62
63         switch (request) {
64                 case PTRACE_PEEKTEXT: /* read word at location addr. */ 
65                 case PTRACE_PEEKDATA: {
66                         unsigned long tmp;
67
68                         ret = read_long(child, addr, &tmp);
69                         if (ret < 0)
70                                 break ;
71                         ret = put_user(tmp, (unsigned long *) data);
72                         break ;
73                 }
74
75         /* read the word at location addr in the USER area. */
76                 case PTRACE_PEEKUSR: {
77                         unsigned long tmp = 0;
78                         
79                         if ((addr & 3) || addr < 0 || addr >= sizeof(struct user)) {
80                                 ret = -EIO;
81                                 break ;
82                         }
83                         
84                         ret = 0;  /* Default return condition */
85                         addr = addr >> 2; /* temporary hack. */
86
87                         if (addr < H8300_REGS_NO)
88                                 tmp = h8300_get_reg(child, addr);
89                         else {
90                                 switch(addr) {
91                                 case 49:
92                                         tmp = child->mm->start_code;
93                                         break ;
94                                 case 50:
95                                         tmp = child->mm->start_data;
96                                         break ;
97                                 case 51:
98                                         tmp = child->mm->end_code;
99                                         break ;
100                                 case 52:
101                                         tmp = child->mm->end_data;
102                                         break ;
103                                 default:
104                                         ret = -EIO;
105                                 }
106                         }
107                         if (!ret)
108                                 ret = put_user(tmp,(unsigned long *) data);
109                         break ;
110                 }
111
112       /* when I and D space are separate, this will have to be fixed. */
113                 case PTRACE_POKETEXT: /* write the word at location addr. */
114                 case PTRACE_POKEDATA:
115                         ret = 0;
116                         if (access_process_vm(child, addr, &data, sizeof(data), 1) == sizeof(data))
117                                 break;
118                         ret = -EIO;
119                         break;
120
121                 case PTRACE_POKEUSR: /* write the word at location addr in the USER area */
122                         if ((addr & 3) || addr < 0 || addr >= sizeof(struct user)) {
123                                 ret = -EIO;
124                                 break ;
125                         }
126                         addr = addr >> 2; /* temporary hack. */
127                             
128                         if (addr == PT_ORIG_ER0) {
129                                 ret = -EIO;
130                                 break ;
131                         }
132                         if (addr < H8300_REGS_NO) {
133                                 ret = h8300_put_reg(child, addr, data);
134                                 break ;
135                         }
136                         ret = -EIO;
137                         break ;
138                 case PTRACE_SYSCALL: /* continue and stop at next (return from) syscall */
139                 case PTRACE_CONT: { /* restart after signal. */
140                         ret = -EIO;
141                         if (!valid_signal(data))
142                                 break ;
143                         if (request == PTRACE_SYSCALL)
144                                 set_tsk_thread_flag(child, TIF_SYSCALL_TRACE);
145                         else
146                                 clear_tsk_thread_flag(child, TIF_SYSCALL_TRACE);
147                         child->exit_code = data;
148                         wake_up_process(child);
149                         /* make sure the single step bit is not set. */
150                         h8300_disable_trace(child);
151                         ret = 0;
152                 }
153
154 /*
155  * make the child exit.  Best I can do is send it a sigkill. 
156  * perhaps it should be put in the status that it wants to 
157  * exit.
158  */
159                 case PTRACE_KILL: {
160
161                         ret = 0;
162                         if (child->exit_state == EXIT_ZOMBIE) /* already dead */
163                                 break;
164                         child->exit_code = SIGKILL;
165                         h8300_disable_trace(child);
166                         wake_up_process(child);
167                         break;
168                 }
169
170                 case PTRACE_SINGLESTEP: {  /* set the trap flag. */
171                         ret = -EIO;
172                         if (!valid_signal(data))
173                                 break;
174                         clear_tsk_thread_flag(child, TIF_SYSCALL_TRACE);
175                         child->exit_code = data;
176                         h8300_enable_trace(child);
177                         wake_up_process(child);
178                         ret = 0;
179                         break;
180                 }
181
182                 case PTRACE_DETACH:     /* detach a process that was attached. */
183                         ret = ptrace_detach(child, data);
184                         break;
185
186                 case PTRACE_GETREGS: { /* Get all gp regs from the child. */
187                         int i;
188                         unsigned long tmp;
189                         for (i = 0; i < H8300_REGS_NO; i++) {
190                             tmp = h8300_get_reg(child, i);
191                             if (put_user(tmp, (unsigned long *) data)) {
192                                 ret = -EFAULT;
193                                 break;
194                             }
195                             data += sizeof(long);
196                         }
197                         ret = 0;
198                         break;
199                 }
200
201                 case PTRACE_SETREGS: { /* Set all gp regs in the child. */
202                         int i;
203                         unsigned long tmp;
204                         for (i = 0; i < H8300_REGS_NO; i++) {
205                             if (get_user(tmp, (unsigned long *) data)) {
206                                 ret = -EFAULT;
207                                 break;
208                             }
209                             h8300_put_reg(child, i, tmp);
210                             data += sizeof(long);
211                         }
212                         ret = 0;
213                         break;
214                 }
215
216                 default:
217                         ret = -EIO;
218                         break;
219         }
220         return ret;
221 }
222
223 asmlinkage void syscall_trace(void)
224 {
225         if (!test_thread_flag(TIF_SYSCALL_TRACE))
226                 return;
227         if (!(current->ptrace & PT_PTRACED))
228                 return;
229         ptrace_notify(SIGTRAP | ((current->ptrace & PT_TRACESYSGOOD)
230                                  ? 0x80 : 0));
231         /*
232          * this isn't the same as continuing with a signal, but it will do
233          * for normal use.  strace only continues with a signal if the
234          * stopping signal is not SIGTRAP.  -brl
235          */
236         if (current->exit_code) {
237                 send_sig(current->exit_code, current, 1);
238                 current->exit_code = 0;
239         }
240 }