diff options
Diffstat (limited to 'arch/cris/arch-v10/kernel/ptrace.c')
| -rw-r--r-- | arch/cris/arch-v10/kernel/ptrace.c | 204 |
1 files changed, 0 insertions, 204 deletions
diff --git a/arch/cris/arch-v10/kernel/ptrace.c b/arch/cris/arch-v10/kernel/ptrace.c deleted file mode 100644 index b89f57ae096e..000000000000 --- a/arch/cris/arch-v10/kernel/ptrace.c +++ /dev/null @@ -1,204 +0,0 @@ -// SPDX-License-Identifier: GPL-2.0 -/* - * Copyright (C) 2000-2003, Axis Communications AB. - */ - -#include <linux/kernel.h> -#include <linux/sched.h> -#include <linux/sched/task_stack.h> -#include <linux/mm.h> -#include <linux/smp.h> -#include <linux/errno.h> -#include <linux/ptrace.h> -#include <linux/user.h> -#include <linux/signal.h> -#include <linux/security.h> - -#include <linux/uaccess.h> -#include <asm/page.h> -#include <asm/pgtable.h> -#include <asm/processor.h> - -/* - * Determines which bits in DCCR the user has access to. - * 1 = access, 0 = no access. - */ -#define DCCR_MASK 0x0000001f /* XNZVC */ - -/* - * Get contents of register REGNO in task TASK. - */ -inline long get_reg(struct task_struct *task, unsigned int regno) -{ - /* USP is a special case, it's not in the pt_regs struct but - * in the tasks thread struct - */ - - if (regno == PT_USP) - return task->thread.usp; - else if (regno < PT_MAX) - return ((unsigned long *)task_pt_regs(task))[regno]; - else - return 0; -} - -/* - * Write contents of register REGNO in task TASK. - */ -inline int put_reg(struct task_struct *task, unsigned int regno, - unsigned long data) -{ - if (regno == PT_USP) - task->thread.usp = data; - else if (regno < PT_MAX) - ((unsigned long *)task_pt_regs(task))[regno] = data; - else - return -1; - return 0; -} - -/* - * Called by kernel/ptrace.c when detaching. - * - * Make sure the single step bit is not set. - */ -void -ptrace_disable(struct task_struct *child) -{ - /* Todo - pending singlesteps? */ - clear_tsk_thread_flag(child, TIF_SYSCALL_TRACE); -} - -/* - * Note that this implementation of ptrace behaves differently from vanilla - * ptrace. Contrary to what the man page says, in the PTRACE_PEEKTEXT, - * PTRACE_PEEKDATA, and PTRACE_PEEKUSER requests the data variable is not - * ignored. Instead, the data variable is expected to point at a location - * (in user space) where the result of the ptrace call is written (instead of - * being returned). - */ -long arch_ptrace(struct task_struct *child, long request, - unsigned long addr, unsigned long data) -{ - int ret; - unsigned int regno = addr >> 2; - unsigned long __user *datap = (unsigned long __user *)data; - - switch (request) { - /* Read word at location address. */ - case PTRACE_PEEKTEXT: - case PTRACE_PEEKDATA: - ret = generic_ptrace_peekdata(child, addr, data); - break; - - /* Read the word at location address in the USER area. */ - case PTRACE_PEEKUSR: { - unsigned long tmp; - - ret = -EIO; - if ((addr & 3) || regno > PT_MAX) - break; - - tmp = get_reg(child, regno); - ret = put_user(tmp, datap); - break; - } - - /* Write the word at location address. */ - case PTRACE_POKETEXT: - case PTRACE_POKEDATA: - ret = generic_ptrace_pokedata(child, addr, data); - break; - - /* Write the word at location address in the USER area. */ - case PTRACE_POKEUSR: - ret = -EIO; - if ((addr & 3) || regno > PT_MAX) - break; - - if (regno == PT_DCCR) { - /* don't allow the tracing process to change stuff like - * interrupt enable, kernel/user bit, dma enables etc. - */ - data &= DCCR_MASK; - data |= get_reg(child, PT_DCCR) & ~DCCR_MASK; - } - if (put_reg(child, regno, data)) - break; - ret = 0; - break; - - /* Get all GP registers from the child. */ - case PTRACE_GETREGS: { - int i; - unsigned long tmp; - - ret = 0; - for (i = 0; i <= PT_MAX; i++) { - tmp = get_reg(child, i); - - if (put_user(tmp, datap)) { - ret = -EFAULT; - break; - } - - datap++; - } - - break; - } - - /* Set all GP registers in the child. */ - case PTRACE_SETREGS: { - int i; - unsigned long tmp; - - ret = 0; - for (i = 0; i <= PT_MAX; i++) { - if (get_user(tmp, datap)) { - ret = -EFAULT; - break; - } - - if (i == PT_DCCR) { - tmp &= DCCR_MASK; - tmp |= get_reg(child, PT_DCCR) & ~DCCR_MASK; - } - - put_reg(child, i, tmp); - datap++; - } - - break; - } - - default: - ret = ptrace_request(child, request, addr, data); - break; - } - - return ret; -} - -void do_syscall_trace(void) -{ - if (!test_thread_flag(TIF_SYSCALL_TRACE)) - return; - - if (!(current->ptrace & PT_PTRACED)) - return; - - /* the 0x80 provides a way for the tracing parent to distinguish - between a syscall stop and SIGTRAP delivery */ - 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. - */ - if (current->exit_code) { - send_sig(current->exit_code, current, 1); - current->exit_code = 0; - } -} |