2 * linux/arch/h8300/kernel/ptrace.c
4 * Yoshinori Sato <ysato@users.sourceforge.jp>
7 * linux/arch/m68k/kernel/ptrace.c
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
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.
18 #include <linux/kernel.h>
19 #include <linux/sched.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/config.h>
27 #include <linux/signal.h>
29 #include <asm/uaccess.h>
31 #include <asm/pgtable.h>
32 #include <asm/system.h>
33 #include <asm/processor.h>
34 #include <asm/signal.h>
36 /* cpu depend functions */
37 extern long h8300_get_reg(struct task_struct *task, int regno);
38 extern int h8300_put_reg(struct task_struct *task, int regno, unsigned long data);
39 extern void h8300_disable_trace(struct task_struct *child);
40 extern void h8300_enable_trace(struct task_struct *child);
43 * does not yet catch signals sent when the child dies.
44 * in exit.c or in signal.c.
48 static int read_long(struct task_struct * tsk, unsigned long addr,
49 unsigned long * result)
51 *result = *(unsigned long *)addr;
55 void ptrace_disable(struct task_struct *child)
57 h8300_disable_trace(child);
60 asmlinkage int sys_ptrace(long request, long pid, long addr, long data)
62 struct task_struct *child;
67 if (request == PTRACE_TRACEME) {
68 /* are we already being traced? */
69 if (current->ptrace & PT_PTRACED)
71 /* set the ptrace bit in the process flags. */
72 current->ptrace |= PT_PTRACED;
77 read_lock(&tasklist_lock);
78 child = find_task_by_pid(pid);
80 get_task_struct(child);
81 read_unlock(&tasklist_lock);
84 if (!vx_check(vx_task_xid(child), VX_WATCH|VX_IDENT))
88 if (pid == 1) /* you may not mess with init */
91 if (request == PTRACE_ATTACH) {
92 ret = ptrace_attach(child);
95 ret = ptrace_check_attach(child, request == PTRACE_KILL);
100 case PTRACE_PEEKTEXT: /* read word at location addr. */
101 case PTRACE_PEEKDATA: {
104 ret = read_long(child, addr, &tmp);
107 ret = put_user(tmp, (unsigned long *) data);
111 /* read the word at location addr in the USER area. */
112 case PTRACE_PEEKUSR: {
113 unsigned long tmp = 0;
115 if ((addr & 3) || addr < 0 || addr >= sizeof(struct user)) {
120 ret = 0; /* Default return condition */
121 addr = addr >> 2; /* temporary hack. */
123 if (addr < H8300_REGS_NO)
124 tmp = h8300_get_reg(child, addr);
128 tmp = child->mm->start_code;
131 tmp = child->mm->start_data;
134 tmp = child->mm->end_code;
137 tmp = child->mm->end_data;
144 ret = put_user(tmp,(unsigned long *) data);
148 /* when I and D space are separate, this will have to be fixed. */
149 case PTRACE_POKETEXT: /* write the word at location addr. */
150 case PTRACE_POKEDATA:
152 if (access_process_vm(child, addr, &data, sizeof(data), 1) == sizeof(data))
157 case PTRACE_POKEUSR: /* write the word at location addr in the USER area */
158 if ((addr & 3) || addr < 0 || addr >= sizeof(struct user)) {
162 addr = addr >> 2; /* temporary hack. */
164 if (addr == PT_ORIG_ER0) {
168 if (addr < H8300_REGS_NO) {
169 ret = h8300_put_reg(child, addr, data);
174 case PTRACE_SYSCALL: /* continue and stop at next (return from) syscall */
175 case PTRACE_CONT: { /* restart after signal. */
177 if (!valid_signal(data))
179 if (request == PTRACE_SYSCALL)
180 set_tsk_thread_flag(child, TIF_SYSCALL_TRACE);
182 clear_tsk_thread_flag(child, TIF_SYSCALL_TRACE);
183 child->exit_code = data;
184 wake_up_process(child);
185 /* make sure the single step bit is not set. */
186 h8300_disable_trace(child);
191 * make the child exit. Best I can do is send it a sigkill.
192 * perhaps it should be put in the status that it wants to
198 if (child->exit_state == EXIT_ZOMBIE) /* already dead */
200 child->exit_code = SIGKILL;
201 h8300_disable_trace(child);
202 wake_up_process(child);
206 case PTRACE_SINGLESTEP: { /* set the trap flag. */
208 if (!valid_signal(data))
210 clear_tsk_thread_flag(child, TIF_SYSCALL_TRACE);
211 child->exit_code = data;
212 h8300_enable_trace(child);
213 wake_up_process(child);
218 case PTRACE_DETACH: /* detach a process that was attached. */
219 ret = ptrace_detach(child, data);
222 case PTRACE_GETREGS: { /* Get all gp regs from the child. */
225 for (i = 0; i < H8300_REGS_NO; i++) {
226 tmp = h8300_get_reg(child, i);
227 if (put_user(tmp, (unsigned long *) data)) {
231 data += sizeof(long);
237 case PTRACE_SETREGS: { /* Set all gp regs in the child. */
240 for (i = 0; i < H8300_REGS_NO; i++) {
241 if (get_user(tmp, (unsigned long *) data)) {
245 h8300_put_reg(child, i, tmp);
246 data += sizeof(long);
257 put_task_struct(child);
263 asmlinkage void syscall_trace(void)
265 if (!test_thread_flag(TIF_SYSCALL_TRACE))
267 if (!(current->ptrace & PT_PTRACED))
269 ptrace_notify(SIGTRAP | ((current->ptrace & PT_TRACESYSGOOD)
272 * this isn't the same as continuing with a signal, but it will do
273 * for normal use. strace only continues with a signal if the
274 * stopping signal is not SIGTRAP. -brl
276 if (current->exit_code) {
277 send_sig(current->exit_code, current, 1);
278 current->exit_code = 0;