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-rw-r--r--arch/h8300/kernel/ptrace.c277
1 files changed, 277 insertions, 0 deletions
diff --git a/arch/h8300/kernel/ptrace.c b/arch/h8300/kernel/ptrace.c
new file mode 100644
index 000000000000..5f19d774a288
--- /dev/null
+++ b/arch/h8300/kernel/ptrace.c
@@ -0,0 +1,277 @@
+/*
+ * linux/arch/h8300/kernel/ptrace.c
+ *
+ * Yoshinori Sato <ysato@users.sourceforge.jp>
+ *
+ * Based on:
+ * linux/arch/m68k/kernel/ptrace.c
+ *
+ * Copyright (C) 1994 by Hamish Macdonald
+ * Taken from linux/kernel/ptrace.c and modified for M680x0.
+ * linux/kernel/ptrace.c is by Ross Biro 1/23/92, edited by Linus Torvalds
+ *
+ * This file is subject to the terms and conditions of the GNU General
+ * Public License. See the file COPYING in the main directory of
+ * this archive for more details.
+ */
+
+#include <linux/kernel.h>
+#include <linux/sched.h>
+#include <linux/mm.h>
+#include <linux/smp.h>
+#include <linux/smp_lock.h>
+#include <linux/errno.h>
+#include <linux/ptrace.h>
+#include <linux/user.h>
+#include <linux/config.h>
+
+#include <asm/uaccess.h>
+#include <asm/page.h>
+#include <asm/pgtable.h>
+#include <asm/system.h>
+#include <asm/processor.h>
+#include <asm/signal.h>
+
+/* cpu depend functions */
+extern long h8300_get_reg(struct task_struct *task, int regno);
+extern int h8300_put_reg(struct task_struct *task, int regno, unsigned long data);
+extern void h8300_disable_trace(struct task_struct *child);
+extern void h8300_enable_trace(struct task_struct *child);
+
+/*
+ * does not yet catch signals sent when the child dies.
+ * in exit.c or in signal.c.
+ */
+
+inline
+static int read_long(struct task_struct * tsk, unsigned long addr,
+ unsigned long * result)
+{
+ *result = *(unsigned long *)addr;
+ return 0;
+}
+
+void ptrace_disable(struct task_struct *child)
+{
+ h8300_disable_trace(child);
+}
+
+asmlinkage int sys_ptrace(long request, long pid, long addr, long data)
+{
+ struct task_struct *child;
+ int ret;
+
+ lock_kernel();
+ ret = -EPERM;
+ if (request == PTRACE_TRACEME) {
+ /* are we already being traced? */
+ if (current->ptrace & PT_PTRACED)
+ goto out;
+ /* set the ptrace bit in the process flags. */
+ current->ptrace |= PT_PTRACED;
+ ret = 0;
+ goto out;
+ }
+ ret = -ESRCH;
+ read_lock(&tasklist_lock);
+ child = find_task_by_pid(pid);
+ if (child)
+ get_task_struct(child);
+ read_unlock(&tasklist_lock);
+ if (!child)
+ goto out;
+
+ ret = -EPERM;
+ if (pid == 1) /* you may not mess with init */
+ goto out_tsk;
+
+ if (request == PTRACE_ATTACH) {
+ ret = ptrace_attach(child);
+ goto out_tsk;
+ }
+ ret = ptrace_check_attach(child, request == PTRACE_KILL);
+ if (ret < 0)
+ goto out_tsk;
+
+ switch (request) {
+ case PTRACE_PEEKTEXT: /* read word at location addr. */
+ case PTRACE_PEEKDATA: {
+ unsigned long tmp;
+
+ ret = read_long(child, addr, &tmp);
+ if (ret < 0)
+ break ;
+ ret = put_user(tmp, (unsigned long *) data);
+ break ;
+ }
+
+ /* read the word at location addr in the USER area. */
+ case PTRACE_PEEKUSR: {
+ unsigned long tmp = 0;
+
+ if ((addr & 3) || addr < 0 || addr >= sizeof(struct user)) {
+ ret = -EIO;
+ break ;
+ }
+
+ ret = 0; /* Default return condition */
+ addr = addr >> 2; /* temporary hack. */
+
+ if (addr < H8300_REGS_NO)
+ tmp = h8300_get_reg(child, addr);
+ else {
+ switch(addr) {
+ case 49:
+ tmp = child->mm->start_code;
+ break ;
+ case 50:
+ tmp = child->mm->start_data;
+ break ;
+ case 51:
+ tmp = child->mm->end_code;
+ break ;
+ case 52:
+ tmp = child->mm->end_data;
+ break ;
+ default:
+ ret = -EIO;
+ }
+ }
+ if (!ret)
+ ret = put_user(tmp,(unsigned long *) data);
+ break ;
+ }
+
+ /* when I and D space are separate, this will have to be fixed. */
+ case PTRACE_POKETEXT: /* write the word at location addr. */
+ case PTRACE_POKEDATA:
+ ret = 0;
+ if (access_process_vm(child, addr, &data, sizeof(data), 1) == sizeof(data))
+ break;
+ ret = -EIO;
+ break;
+
+ case PTRACE_POKEUSR: /* write the word at location addr in the USER area */
+ if ((addr & 3) || addr < 0 || addr >= sizeof(struct user)) {
+ ret = -EIO;
+ break ;
+ }
+ addr = addr >> 2; /* temporary hack. */
+
+ if (addr == PT_ORIG_ER0) {
+ ret = -EIO;
+ break ;
+ }
+ if (addr < H8300_REGS_NO) {
+ ret = h8300_put_reg(child, addr, data);
+ break ;
+ }
+ ret = -EIO;
+ break ;
+ case PTRACE_SYSCALL: /* continue and stop at next (return from) syscall */
+ case PTRACE_CONT: { /* restart after signal. */
+ ret = -EIO;
+ if ((unsigned long) data >= _NSIG)
+ break ;
+ if (request == PTRACE_SYSCALL)
+ set_tsk_thread_flag(child, TIF_SYSCALL_TRACE);
+ else
+ clear_tsk_thread_flag(child, TIF_SYSCALL_TRACE);
+ child->exit_code = data;
+ wake_up_process(child);
+ /* make sure the single step bit is not set. */
+ h8300_disable_trace(child);
+ ret = 0;
+ }
+
+/*
+ * make the child exit. Best I can do is send it a sigkill.
+ * perhaps it should be put in the status that it wants to
+ * exit.
+ */
+ case PTRACE_KILL: {
+
+ ret = 0;
+ if (child->exit_state == EXIT_ZOMBIE) /* already dead */
+ break;
+ child->exit_code = SIGKILL;
+ h8300_disable_trace(child);
+ wake_up_process(child);
+ break;
+ }
+
+ case PTRACE_SINGLESTEP: { /* set the trap flag. */
+ ret = -EIO;
+ if ((unsigned long) data > _NSIG)
+ break;
+ clear_tsk_thread_flag(child, TIF_SYSCALL_TRACE);
+ child->exit_code = data;
+ h8300_enable_trace(child);
+ wake_up_process(child);
+ ret = 0;
+ break;
+ }
+
+ case PTRACE_DETACH: /* detach a process that was attached. */
+ ret = ptrace_detach(child, data);
+ break;
+
+ case PTRACE_GETREGS: { /* Get all gp regs from the child. */
+ int i;
+ unsigned long tmp;
+ for (i = 0; i < H8300_REGS_NO; i++) {
+ tmp = h8300_get_reg(child, i);
+ if (put_user(tmp, (unsigned long *) data)) {
+ ret = -EFAULT;
+ break;
+ }
+ data += sizeof(long);
+ }
+ ret = 0;
+ break;
+ }
+
+ case PTRACE_SETREGS: { /* Set all gp regs in the child. */
+ int i;
+ unsigned long tmp;
+ for (i = 0; i < H8300_REGS_NO; i++) {
+ if (get_user(tmp, (unsigned long *) data)) {
+ ret = -EFAULT;
+ break;
+ }
+ h8300_put_reg(child, i, tmp);
+ data += sizeof(long);
+ }
+ ret = 0;
+ break;
+ }
+
+ default:
+ ret = -EIO;
+ break;
+ }
+out_tsk:
+ put_task_struct(child);
+out:
+ unlock_kernel();
+ return ret;
+}
+
+asmlinkage void syscall_trace(void)
+{
+ if (!test_thread_flag(TIF_SYSCALL_TRACE))
+ return;
+ if (!(current->ptrace & PT_PTRACED))
+ return;
+ ptrace_notify(SIGTRAP | ((current->ptrace & PT_TRACESYSGOOD)
+ ? 0x80 : 0));
+ /*
+ * this isn't the same as continuing with a signal, but it will do
+ * for normal use. strace only continues with a signal if the
+ * stopping signal is not SIGTRAP. -brl
+ */
+ if (current->exit_code) {
+ send_sig(current->exit_code, current, 1);
+ current->exit_code = 0;
+ }
+}
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