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7ed20e1ad5
Convert most of the current code that uses _NSIG directly to instead use valid_signal(). This avoids gcc -W warnings and off-by-one errors. Signed-off-by: Jesper Juhl <juhl-lkml@dif.dk> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
279 lines
6.4 KiB
C
279 lines
6.4 KiB
C
/*
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* linux/arch/h8300/kernel/ptrace.c
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*
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* Yoshinori Sato <ysato@users.sourceforge.jp>
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*
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* Based on:
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* linux/arch/m68k/kernel/ptrace.c
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*
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* Copyright (C) 1994 by Hamish Macdonald
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* Taken from linux/kernel/ptrace.c and modified for M680x0.
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* linux/kernel/ptrace.c is by Ross Biro 1/23/92, edited by Linus Torvalds
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*
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* This file is subject to the terms and conditions of the GNU General
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* Public License. See the file COPYING in the main directory of
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* this archive for more details.
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*/
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#include <linux/kernel.h>
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#include <linux/sched.h>
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#include <linux/mm.h>
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#include <linux/smp.h>
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#include <linux/smp_lock.h>
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#include <linux/errno.h>
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#include <linux/ptrace.h>
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#include <linux/user.h>
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#include <linux/config.h>
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#include <linux/signal.h>
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#include <asm/uaccess.h>
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#include <asm/page.h>
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#include <asm/pgtable.h>
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#include <asm/system.h>
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#include <asm/processor.h>
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#include <asm/signal.h>
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/* cpu depend functions */
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extern long h8300_get_reg(struct task_struct *task, int regno);
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extern int h8300_put_reg(struct task_struct *task, int regno, unsigned long data);
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extern void h8300_disable_trace(struct task_struct *child);
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extern void h8300_enable_trace(struct task_struct *child);
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/*
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* does not yet catch signals sent when the child dies.
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* in exit.c or in signal.c.
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*/
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inline
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static int read_long(struct task_struct * tsk, unsigned long addr,
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unsigned long * result)
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{
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*result = *(unsigned long *)addr;
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return 0;
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}
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void ptrace_disable(struct task_struct *child)
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{
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h8300_disable_trace(child);
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}
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asmlinkage int sys_ptrace(long request, long pid, long addr, long data)
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{
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struct task_struct *child;
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int ret;
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lock_kernel();
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ret = -EPERM;
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if (request == PTRACE_TRACEME) {
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/* are we already being traced? */
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if (current->ptrace & PT_PTRACED)
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goto out;
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/* set the ptrace bit in the process flags. */
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current->ptrace |= PT_PTRACED;
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ret = 0;
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goto out;
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}
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ret = -ESRCH;
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read_lock(&tasklist_lock);
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child = find_task_by_pid(pid);
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if (child)
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get_task_struct(child);
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read_unlock(&tasklist_lock);
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if (!child)
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goto out;
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ret = -EPERM;
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if (pid == 1) /* you may not mess with init */
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goto out_tsk;
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if (request == PTRACE_ATTACH) {
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ret = ptrace_attach(child);
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goto out_tsk;
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}
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ret = ptrace_check_attach(child, request == PTRACE_KILL);
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if (ret < 0)
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goto out_tsk;
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switch (request) {
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case PTRACE_PEEKTEXT: /* read word at location addr. */
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case PTRACE_PEEKDATA: {
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unsigned long tmp;
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ret = read_long(child, addr, &tmp);
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if (ret < 0)
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break ;
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ret = put_user(tmp, (unsigned long *) data);
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break ;
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}
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/* read the word at location addr in the USER area. */
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case PTRACE_PEEKUSR: {
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unsigned long tmp = 0;
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if ((addr & 3) || addr < 0 || addr >= sizeof(struct user)) {
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ret = -EIO;
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break ;
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}
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ret = 0; /* Default return condition */
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addr = addr >> 2; /* temporary hack. */
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if (addr < H8300_REGS_NO)
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tmp = h8300_get_reg(child, addr);
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else {
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switch(addr) {
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case 49:
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tmp = child->mm->start_code;
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break ;
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case 50:
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tmp = child->mm->start_data;
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break ;
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case 51:
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tmp = child->mm->end_code;
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break ;
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case 52:
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tmp = child->mm->end_data;
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break ;
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default:
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ret = -EIO;
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}
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}
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if (!ret)
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ret = put_user(tmp,(unsigned long *) data);
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break ;
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}
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/* when I and D space are separate, this will have to be fixed. */
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case PTRACE_POKETEXT: /* write the word at location addr. */
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case PTRACE_POKEDATA:
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ret = 0;
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if (access_process_vm(child, addr, &data, sizeof(data), 1) == sizeof(data))
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break;
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ret = -EIO;
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break;
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case PTRACE_POKEUSR: /* write the word at location addr in the USER area */
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if ((addr & 3) || addr < 0 || addr >= sizeof(struct user)) {
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ret = -EIO;
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break ;
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}
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addr = addr >> 2; /* temporary hack. */
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if (addr == PT_ORIG_ER0) {
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ret = -EIO;
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break ;
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}
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if (addr < H8300_REGS_NO) {
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ret = h8300_put_reg(child, addr, data);
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break ;
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}
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ret = -EIO;
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break ;
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case PTRACE_SYSCALL: /* continue and stop at next (return from) syscall */
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case PTRACE_CONT: { /* restart after signal. */
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ret = -EIO;
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if (!valid_signal(data))
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break ;
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if (request == PTRACE_SYSCALL)
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set_tsk_thread_flag(child, TIF_SYSCALL_TRACE);
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else
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clear_tsk_thread_flag(child, TIF_SYSCALL_TRACE);
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child->exit_code = data;
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wake_up_process(child);
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/* make sure the single step bit is not set. */
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h8300_disable_trace(child);
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ret = 0;
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}
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/*
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* make the child exit. Best I can do is send it a sigkill.
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* perhaps it should be put in the status that it wants to
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* exit.
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*/
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case PTRACE_KILL: {
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ret = 0;
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if (child->exit_state == EXIT_ZOMBIE) /* already dead */
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break;
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child->exit_code = SIGKILL;
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h8300_disable_trace(child);
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wake_up_process(child);
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break;
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}
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case PTRACE_SINGLESTEP: { /* set the trap flag. */
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ret = -EIO;
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if (!valid_signal(data))
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break;
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clear_tsk_thread_flag(child, TIF_SYSCALL_TRACE);
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child->exit_code = data;
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h8300_enable_trace(child);
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wake_up_process(child);
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ret = 0;
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break;
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}
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case PTRACE_DETACH: /* detach a process that was attached. */
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ret = ptrace_detach(child, data);
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break;
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case PTRACE_GETREGS: { /* Get all gp regs from the child. */
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int i;
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unsigned long tmp;
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for (i = 0; i < H8300_REGS_NO; i++) {
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tmp = h8300_get_reg(child, i);
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if (put_user(tmp, (unsigned long *) data)) {
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ret = -EFAULT;
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break;
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}
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data += sizeof(long);
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}
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ret = 0;
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break;
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}
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case PTRACE_SETREGS: { /* Set all gp regs in the child. */
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int i;
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unsigned long tmp;
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for (i = 0; i < H8300_REGS_NO; i++) {
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if (get_user(tmp, (unsigned long *) data)) {
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ret = -EFAULT;
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break;
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}
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h8300_put_reg(child, i, tmp);
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data += sizeof(long);
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}
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ret = 0;
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break;
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}
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default:
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ret = -EIO;
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break;
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}
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out_tsk:
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put_task_struct(child);
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out:
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unlock_kernel();
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return ret;
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}
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asmlinkage void syscall_trace(void)
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{
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if (!test_thread_flag(TIF_SYSCALL_TRACE))
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return;
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if (!(current->ptrace & PT_PTRACED))
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return;
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ptrace_notify(SIGTRAP | ((current->ptrace & PT_TRACESYSGOOD)
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? 0x80 : 0));
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/*
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* this isn't the same as continuing with a signal, but it will do
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* for normal use. strace only continues with a signal if the
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* stopping signal is not SIGTRAP. -brl
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*/
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if (current->exit_code) {
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send_sig(current->exit_code, current, 1);
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current->exit_code = 0;
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}
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}
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