280 lines
6.7 KiB
C
280 lines
6.7 KiB
C
/*
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* linux/arch/m68knommu/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/errno.h>
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#include <linux/ptrace.h>
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#include <linux/user.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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/*
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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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/* determines which bits in the SR the user has access to. */
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/* 1 = access 0 = no access */
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#define SR_MASK 0x001f
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/* sets the trace bits. */
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#define TRACE_BITS 0x8000
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/* Find the stack offset for a register, relative to thread.esp0. */
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#define PT_REG(reg) ((long)&((struct pt_regs *)0)->reg)
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#define SW_REG(reg) ((long)&((struct switch_stack *)0)->reg \
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- sizeof(struct switch_stack))
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/* Mapping from PT_xxx to the stack offset at which the register is
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saved. Notice that usp has no stack-slot and needs to be treated
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specially (see get_reg/put_reg below). */
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static int regoff[] = {
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PT_REG(d1), PT_REG(d2), PT_REG(d3), PT_REG(d4),
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PT_REG(d5), SW_REG(d6), SW_REG(d7), PT_REG(a0),
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PT_REG(a1), PT_REG(a2), SW_REG(a3), SW_REG(a4),
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SW_REG(a5), SW_REG(a6), PT_REG(d0), -1,
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PT_REG(orig_d0), PT_REG(sr), PT_REG(pc),
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};
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/*
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* Get contents of register REGNO in task TASK.
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*/
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static inline long get_reg(struct task_struct *task, int regno)
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{
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unsigned long *addr;
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if (regno == PT_USP)
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addr = &task->thread.usp;
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else if (regno < ARRAY_SIZE(regoff))
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addr = (unsigned long *)(task->thread.esp0 + regoff[regno]);
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else
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return 0;
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return *addr;
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}
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/*
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* Write contents of register REGNO in task TASK.
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*/
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static inline int put_reg(struct task_struct *task, int regno,
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unsigned long data)
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{
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unsigned long *addr;
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if (regno == PT_USP)
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addr = &task->thread.usp;
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else if (regno < ARRAY_SIZE(regoff))
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addr = (unsigned long *) (task->thread.esp0 + regoff[regno]);
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else
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return -1;
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*addr = data;
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return 0;
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}
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void user_enable_single_step(struct task_struct *task)
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{
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unsigned long srflags;
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srflags = get_reg(task, PT_SR) | (TRACE_BITS << 16);
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put_reg(task, PT_SR, srflags);
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}
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void user_disable_single_step(struct task_struct *task)
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{
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unsigned long srflags;
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srflags = get_reg(task, PT_SR) & ~(TRACE_BITS << 16);
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put_reg(task, PT_SR, srflags);
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}
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/*
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* Called by kernel/ptrace.c when detaching..
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*
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* Make sure the single step bit is not set.
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*/
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void ptrace_disable(struct task_struct *child)
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{
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/* make sure the single step bit is not set. */
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user_disable_single_step(child);
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}
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long arch_ptrace(struct task_struct *child, long request, long addr, long data)
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{
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int ret;
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switch (request) {
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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;
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ret = -EIO;
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if ((addr & 3) || addr < 0 ||
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addr > sizeof(struct user) - 3)
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break;
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tmp = 0; /* Default return condition */
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addr = addr >> 2; /* temporary hack. */
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ret = -EIO;
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if (addr < 19) {
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tmp = get_reg(child, addr);
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if (addr == PT_SR)
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tmp >>= 16;
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} else if (addr >= 21 && addr < 49) {
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tmp = child->thread.fp[addr - 21];
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#ifdef CONFIG_M68KFPU_EMU
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/* Convert internal fpu reg representation
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* into long double format
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*/
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if (FPU_IS_EMU && (addr < 45) && !(addr % 3))
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tmp = ((tmp & 0xffff0000) << 15) |
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((tmp & 0x0000ffff) << 16);
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#endif
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} else if (addr == 49) {
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tmp = child->mm->start_code;
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} else if (addr == 50) {
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tmp = child->mm->start_data;
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} else if (addr == 51) {
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tmp = child->mm->end_code;
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} else
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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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case PTRACE_POKEUSR: /* write the word at location addr in the USER area */
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ret = -EIO;
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if ((addr & 3) || addr < 0 ||
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addr > sizeof(struct user) - 3)
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break;
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addr = addr >> 2; /* temporary hack. */
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if (addr == PT_SR) {
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data &= SR_MASK;
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data <<= 16;
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data |= get_reg(child, PT_SR) & ~(SR_MASK << 16);
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}
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if (addr < 19) {
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if (put_reg(child, addr, data))
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break;
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ret = 0;
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break;
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}
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if (addr >= 21 && addr < 48)
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{
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#ifdef CONFIG_M68KFPU_EMU
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/* Convert long double format
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* into internal fpu reg representation
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*/
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if (FPU_IS_EMU && (addr < 45) && !(addr % 3)) {
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data = (unsigned long)data << 15;
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data = (data & 0xffff0000) |
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((data & 0x0000ffff) >> 1);
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}
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#endif
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child->thread.fp[addr - 21] = data;
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ret = 0;
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}
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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 < 19; i++) {
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tmp = get_reg(child, i);
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if (i == PT_SR)
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tmp >>= 16;
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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 < 19; 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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if (i == PT_SR) {
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tmp &= SR_MASK;
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tmp <<= 16;
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tmp |= get_reg(child, PT_SR) & ~(SR_MASK << 16);
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}
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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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#ifdef PTRACE_GETFPREGS
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case PTRACE_GETFPREGS: { /* Get the child FPU state. */
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ret = 0;
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if (copy_to_user((void *)data, &child->thread.fp,
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sizeof(struct user_m68kfp_struct)))
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ret = -EFAULT;
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break;
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}
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#endif
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#ifdef PTRACE_SETFPREGS
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case PTRACE_SETFPREGS: { /* Set the child FPU state. */
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ret = 0;
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if (copy_from_user(&child->thread.fp, (void *)data,
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sizeof(struct user_m68kfp_struct)))
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ret = -EFAULT;
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break;
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}
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#endif
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case PTRACE_GET_THREAD_AREA:
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ret = put_user(task_thread_info(child)->tp_value,
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(unsigned long __user *)data);
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break;
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default:
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ret = ptrace_request(child, request, addr, data);
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break;
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}
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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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