Add full support for regs, uregs and fpregs

Author: igorcanadi

fs/proc/base.c

@@ -811,24 +811,151 @@ static const struct file_operations proc_single_file_operations = {
 static ssize_t ureg_read(struct file * file, char __user * buf,
 size_t count, loff_t *ppos)
 {
+ssize_t retval;
 struct task_struct *task = get_proc_task(file->f_path.dentry->d_inode);
 
 printk("Reading uregs on %d\n", *ppos);
 
-long retval = arch_ptrace(task, PTRACE_PEEKUSR, 
+retval = arch_ptrace(task, PTRACE_PEEKUSR,
 (unsigned long) *ppos, (unsigned long) buf);
 printk("Retval: %ld\n", retval);
 
 if (retval < 0) 
 return 0;
+
+ppos += sizeof(unsigned long);
+
 return sizeof(unsigned long);
 }
 
+static ssize_t ureg_write(struct file *file, const unsigned char __user *buf,
+ size_t count, loff_t *ppos) {
+ssize_t retval;
+unsigned long word = 0;
+int i;
+struct task_struct *task = get_proc_task(file->f_path.dentry->d_inode);
+
+for (i = 0; i < count && i < sizeof(word); ++i) {
+word |= buf[i] << (i*8);
+}
+
+printk("Writing uregs word %ld on %lld\n", word, *ppos);
+
+retval = arch_ptrace(task, PTRACE_POKEUSR,
+(unsigned long) *ppos, word);
+
+// sucess
+if (retval == 0)
+return sizeof(word);
+
+return retval;
+}
+
 static const struct file_operations proc_ureg_operations = {
 .read= ureg_read,
+.write= ureg_write,
 .llseek= generic_file_llseek,
 };
 
+static ssize_t regs_read(struct file * file, char __user * buf,
+size_t count, loff_t *ppos)
+{
+ssize_t retval;
+struct task_struct *task = get_proc_task(file->f_path.dentry->d_inode);
+
+printk("Reading regs");
+
+if (count < sizeof(struct user_regs_struct)) {
+printk("Buffer too small");
+return -EIO;
+}
+
+retval = arch_ptrace(task, PTRACE_GETREGS,
+0, (unsigned long) buf);
+printk("Retval: %ld\n", retval);
+
+if (retval < 0)
+return 0;
+
+return sizeof(struct user_regs_struct);
+}
+
+static ssize_t regs_write(struct file *file, const unsigned char __user *buf,
+ size_t count, loff_t *ppos) {
+ssize_t retval;
+struct task_struct *task = get_proc_task(file->f_path.dentry->d_inode);
+
+printk("Writing regs");
+
+if (count < sizeof(struct user_regs_struct)) {
+printk("Buffer too small");
+return -EIO;
+}
+
+retval = arch_ptrace(task, PTRACE_SETREGS,
+0, (unsigned long) buf);
+
+// sucess
+if (retval == 0)
+return sizeof(struct user_regs_struct);
+
+return retval;
+}
+
+static const struct file_operations proc_regs_operations = {
+.read= regs_read,
+.write= regs_write,
+};
+
+static ssize_t fpregs_read(struct file * file, char __user * buf,
+size_t count, loff_t *ppos)
+{
+ssize_t retval;
+struct task_struct *task = get_proc_task(file->f_path.dentry->d_inode);
+
+printk("Reading fpregs");
+
+if (count < sizeof(struct user_i387_struct)) {
+printk("Buffer too small");
+return -EIO;
+}
+
+retval = arch_ptrace(task, PTRACE_GETFPREGS,
+0, (unsigned long) buf);
+printk("Retval: %ld\n", retval);
+
+if (retval < 0)
+return 0;
+
+return sizeof(struct user_i387_struct);
+}
+
+static ssize_t fpregs_write(struct file *file, const unsigned char __user *buf,
+ size_t count, loff_t *ppos) {
+ssize_t retval;
+struct task_struct *task = get_proc_task(file->f_path.dentry->d_inode);
+
+printk("Writing fpregs");
+
+if (count < sizeof(struct user_i387_struct)) {
+printk("Buffer too small");
+return -EIO;
+}
+
+retval = arch_ptrace(task, PTRACE_SETFPREGS,
+0, (unsigned long) buf);
+
+// sucess
+if (retval == 0)
+return sizeof(struct user_i387_struct);
+
+return retval;
+}
+
+static const struct file_operations proc_fpregs_operations = {
+.read= fpregs_read,
+.write= fpregs_write,
+};
 
 static int mem_open(struct inode* inode, struct file* file)
 {
@@ -3003,7 +3130,9 @@ static const struct pid_entry tgid_base_stuff[] = {
 REG("mem", S_IRUSR|S_IWUSR, proc_mem_operations),
 REG("ctl", S_IWUSR, proc_ctl_operations),
 REG("wait", S_IWUSR, proc_wait_operations),
-REG("uregs", S_IRUGO, proc_ureg_operations),
+REG("uregs", S_IRUSR|S_IWUSR, proc_ureg_operations),
+REG("regs", S_IRUSR|S_IWUSR, proc_regs_operations),
+REG("fpregs", S_IRUSR|S_IWUSR, proc_fpregs_operations),
 REG("eventmessage", S_IRUSR, proc_eventmessage_operations),
 REG("last_siginfo", S_IRUSR, proc_last_siginfo_operations),
 LNK("cwd", proc_cwd_link),