Remove asm/a.out.h files for all architectures without a.out support.
[linux-3.10.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 = generic_ptrace_pokedata(child, addr, data);
115                         break;
116
117                 case PTRACE_POKEUSR: /* write the word at location addr in the USER area */
118                         if ((addr & 3) || addr < 0 || addr >= sizeof(struct user)) {
119                                 ret = -EIO;
120                                 break ;
121                         }
122                         addr = addr >> 2; /* temporary hack. */
123                             
124                         if (addr == PT_ORIG_ER0) {
125                                 ret = -EIO;
126                                 break ;
127                         }
128                         if (addr < H8300_REGS_NO) {
129                                 ret = h8300_put_reg(child, addr, data);
130                                 break ;
131                         }
132                         ret = -EIO;
133                         break ;
134                 case PTRACE_SYSCALL: /* continue and stop at next (return from) syscall */
135                 case PTRACE_CONT: { /* restart after signal. */
136                         ret = -EIO;
137                         if (!valid_signal(data))
138                                 break ;
139                         if (request == PTRACE_SYSCALL)
140                                 set_tsk_thread_flag(child, TIF_SYSCALL_TRACE);
141                         else
142                                 clear_tsk_thread_flag(child, TIF_SYSCALL_TRACE);
143                         child->exit_code = data;
144                         wake_up_process(child);
145                         /* make sure the single step bit is not set. */
146                         h8300_disable_trace(child);
147                         ret = 0;
148                 }
149
150 /*
151  * make the child exit.  Best I can do is send it a sigkill. 
152  * perhaps it should be put in the status that it wants to 
153  * exit.
154  */
155                 case PTRACE_KILL: {
156
157                         ret = 0;
158                         if (child->exit_state == EXIT_ZOMBIE) /* already dead */
159                                 break;
160                         child->exit_code = SIGKILL;
161                         h8300_disable_trace(child);
162                         wake_up_process(child);
163                         break;
164                 }
165
166                 case PTRACE_SINGLESTEP: {  /* set the trap flag. */
167                         ret = -EIO;
168                         if (!valid_signal(data))
169                                 break;
170                         clear_tsk_thread_flag(child, TIF_SYSCALL_TRACE);
171                         child->exit_code = data;
172                         h8300_enable_trace(child);
173                         wake_up_process(child);
174                         ret = 0;
175                         break;
176                 }
177
178                 case PTRACE_DETACH:     /* detach a process that was attached. */
179                         ret = ptrace_detach(child, data);
180                         break;
181
182                 case PTRACE_GETREGS: { /* Get all gp regs from the child. */
183                         int i;
184                         unsigned long tmp;
185                         for (i = 0; i < H8300_REGS_NO; i++) {
186                             tmp = h8300_get_reg(child, i);
187                             if (put_user(tmp, (unsigned long *) data)) {
188                                 ret = -EFAULT;
189                                 break;
190                             }
191                             data += sizeof(long);
192                         }
193                         ret = 0;
194                         break;
195                 }
196
197                 case PTRACE_SETREGS: { /* Set all gp regs in the child. */
198                         int i;
199                         unsigned long tmp;
200                         for (i = 0; i < H8300_REGS_NO; i++) {
201                             if (get_user(tmp, (unsigned long *) data)) {
202                                 ret = -EFAULT;
203                                 break;
204                             }
205                             h8300_put_reg(child, i, tmp);
206                             data += sizeof(long);
207                         }
208                         ret = 0;
209                         break;
210                 }
211
212                 default:
213                         ret = -EIO;
214                         break;
215         }
216         return ret;
217 }
218
219 asmlinkage void do_syscall_trace(void)
220 {
221         if (!test_thread_flag(TIF_SYSCALL_TRACE))
222                 return;
223         if (!(current->ptrace & PT_PTRACED))
224                 return;
225         ptrace_notify(SIGTRAP | ((current->ptrace & PT_TRACESYSGOOD)
226                                  ? 0x80 : 0));
227         /*
228          * this isn't the same as continuing with a signal, but it will do
229          * for normal use.  strace only continues with a signal if the
230          * stopping signal is not SIGTRAP.  -brl
231          */
232         if (current->exit_code) {
233                 send_sig(current->exit_code, current, 1);
234                 current->exit_code = 0;
235         }
236 }