ptrace: cleanup arch_ptrace() on h8300
[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
38
39 void user_disable_single_step(struct task_struct *child)
40 {
41 }
42
43 /*
44  * does not yet catch signals sent when the child dies.
45  * in exit.c or in signal.c.
46  */
47
48 void ptrace_disable(struct task_struct *child)
49 {
50         user_disable_single_step(child);
51 }
52
53 long arch_ptrace(struct task_struct *child, long request,
54                  unsigned long addr, unsigned long data)
55 {
56         int ret;
57         int regno = addr >> 2;
58         unsigned long __user *datap = (unsigned long __user *) data;
59
60         switch (request) {
61         /* read the word at location addr in the USER area. */
62                 case PTRACE_PEEKUSR: {
63                         unsigned long tmp = 0;
64                         
65                         if ((addr & 3) || addr >= sizeof(struct user)) {
66                                 ret = -EIO;
67                                 break ;
68                         }
69                         
70                         ret = 0;  /* Default return condition */
71
72                         if (regno < H8300_REGS_NO)
73                                 tmp = h8300_get_reg(child, regno);
74                         else {
75                                 switch (regno) {
76                                 case 49:
77                                         tmp = child->mm->start_code;
78                                         break ;
79                                 case 50:
80                                         tmp = child->mm->start_data;
81                                         break ;
82                                 case 51:
83                                         tmp = child->mm->end_code;
84                                         break ;
85                                 case 52:
86                                         tmp = child->mm->end_data;
87                                         break ;
88                                 default:
89                                         ret = -EIO;
90                                 }
91                         }
92                         if (!ret)
93                                 ret = put_user(tmp, datap);
94                         break ;
95                 }
96
97       /* when I and D space are separate, this will have to be fixed. */
98                 case PTRACE_POKEUSR: /* write the word at location addr in the USER area */
99                         if ((addr & 3) || addr >= sizeof(struct user)) {
100                                 ret = -EIO;
101                                 break ;
102                         }
103                             
104                         if (regno == PT_ORIG_ER0) {
105                                 ret = -EIO;
106                                 break ;
107                         }
108                         if (regno < H8300_REGS_NO) {
109                                 ret = h8300_put_reg(child, regno, data);
110                                 break ;
111                         }
112                         ret = -EIO;
113                         break ;
114
115                 case PTRACE_GETREGS: { /* Get all gp regs from the child. */
116                         int i;
117                         unsigned long tmp;
118                         for (i = 0; i < H8300_REGS_NO; i++) {
119                             tmp = h8300_get_reg(child, i);
120                             if (put_user(tmp, datap)) {
121                                 ret = -EFAULT;
122                                 break;
123                             }
124                             datap++;
125                         }
126                         ret = 0;
127                         break;
128                 }
129
130                 case PTRACE_SETREGS: { /* Set all gp regs in the child. */
131                         int i;
132                         unsigned long tmp;
133                         for (i = 0; i < H8300_REGS_NO; i++) {
134                             if (get_user(tmp, datap)) {
135                                 ret = -EFAULT;
136                                 break;
137                             }
138                             h8300_put_reg(child, i, tmp);
139                             datap++;
140                         }
141                         ret = 0;
142                         break;
143                 }
144
145                 default:
146                         ret = ptrace_request(child, request, addr, data);
147                         break;
148         }
149         return ret;
150 }
151
152 asmlinkage void do_syscall_trace(void)
153 {
154         if (!test_thread_flag(TIF_SYSCALL_TRACE))
155                 return;
156         if (!(current->ptrace & PT_PTRACED))
157                 return;
158         ptrace_notify(SIGTRAP | ((current->ptrace & PT_TRACESYSGOOD)
159                                  ? 0x80 : 0));
160         /*
161          * this isn't the same as continuing with a signal, but it will do
162          * for normal use.  strace only continues with a signal if the
163          * stopping signal is not SIGTRAP.  -brl
164          */
165         if (current->exit_code) {
166                 send_sig(current->exit_code, current, 1);
167                 current->exit_code = 0;
168         }
169 }