new helper: restore_saved_sigmask()
[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/processor.h>
31 #include <asm/signal.h>
32
33 /* cpu depend functions */
34 extern long h8300_get_reg(struct task_struct *task, int regno);
35 extern int  h8300_put_reg(struct task_struct *task, int regno, unsigned long data);
36
37
38 void user_disable_single_step(struct task_struct *child)
39 {
40 }
41
42 /*
43  * does not yet catch signals sent when the child dies.
44  * in exit.c or in signal.c.
45  */
46
47 void ptrace_disable(struct task_struct *child)
48 {
49         user_disable_single_step(child);
50 }
51
52 long arch_ptrace(struct task_struct *child, long request,
53                  unsigned long addr, unsigned long data)
54 {
55         int ret;
56         int regno = addr >> 2;
57         unsigned long __user *datap = (unsigned long __user *) data;
58
59         switch (request) {
60         /* read the word at location addr in the USER area. */
61                 case PTRACE_PEEKUSR: {
62                         unsigned long tmp = 0;
63                         
64                         if ((addr & 3) || addr >= sizeof(struct user)) {
65                                 ret = -EIO;
66                                 break ;
67                         }
68                         
69                         ret = 0;  /* Default return condition */
70
71                         if (regno < H8300_REGS_NO)
72                                 tmp = h8300_get_reg(child, regno);
73                         else {
74                                 switch (regno) {
75                                 case 49:
76                                         tmp = child->mm->start_code;
77                                         break ;
78                                 case 50:
79                                         tmp = child->mm->start_data;
80                                         break ;
81                                 case 51:
82                                         tmp = child->mm->end_code;
83                                         break ;
84                                 case 52:
85                                         tmp = child->mm->end_data;
86                                         break ;
87                                 default:
88                                         ret = -EIO;
89                                 }
90                         }
91                         if (!ret)
92                                 ret = put_user(tmp, datap);
93                         break ;
94                 }
95
96       /* when I and D space are separate, this will have to be fixed. */
97                 case PTRACE_POKEUSR: /* write the word at location addr in the USER area */
98                         if ((addr & 3) || addr >= sizeof(struct user)) {
99                                 ret = -EIO;
100                                 break ;
101                         }
102                             
103                         if (regno == PT_ORIG_ER0) {
104                                 ret = -EIO;
105                                 break ;
106                         }
107                         if (regno < H8300_REGS_NO) {
108                                 ret = h8300_put_reg(child, regno, data);
109                                 break ;
110                         }
111                         ret = -EIO;
112                         break ;
113
114                 case PTRACE_GETREGS: { /* Get all gp regs from the child. */
115                         int i;
116                         unsigned long tmp;
117                         for (i = 0; i < H8300_REGS_NO; i++) {
118                             tmp = h8300_get_reg(child, i);
119                             if (put_user(tmp, datap)) {
120                                 ret = -EFAULT;
121                                 break;
122                             }
123                             datap++;
124                         }
125                         ret = 0;
126                         break;
127                 }
128
129                 case PTRACE_SETREGS: { /* Set all gp regs in the child. */
130                         int i;
131                         unsigned long tmp;
132                         for (i = 0; i < H8300_REGS_NO; i++) {
133                             if (get_user(tmp, datap)) {
134                                 ret = -EFAULT;
135                                 break;
136                             }
137                             h8300_put_reg(child, i, tmp);
138                             datap++;
139                         }
140                         ret = 0;
141                         break;
142                 }
143
144                 default:
145                         ret = ptrace_request(child, request, addr, data);
146                         break;
147         }
148         return ret;
149 }
150
151 asmlinkage void do_syscall_trace(void)
152 {
153         if (!test_thread_flag(TIF_SYSCALL_TRACE))
154                 return;
155         if (!(current->ptrace & PT_PTRACED))
156                 return;
157         ptrace_notify(SIGTRAP | ((current->ptrace & PT_TRACESYSGOOD)
158                                  ? 0x80 : 0));
159         /*
160          * this isn't the same as continuing with a signal, but it will do
161          * for normal use.  strace only continues with a signal if the
162          * stopping signal is not SIGTRAP.  -brl
163          */
164         if (current->exit_code) {
165                 send_sig(current->exit_code, current, 1);
166                 current->exit_code = 0;
167         }
168 }