1/* 2 * linux/arch/h8300/kernel/ptrace.c 3 * 4 * Yoshinori Sato <ysato@users.sourceforge.jp> 5 * 6 * Based on: 7 * linux/arch/m68k/kernel/ptrace.c 8 * 9 * Copyright (C) 1994 by Hamish Macdonald 10 * Taken from linux/kernel/ptrace.c and modified for M680x0. 11 * linux/kernel/ptrace.c is by Ross Biro 1/23/92, edited by Linus Torvalds 12 * 13 * This file is subject to the terms and conditions of the GNU General 14 * Public License. See the file COPYING in the main directory of 15 * this archive for more details. 16 */ 17 18#include <linux/kernel.h> 19#include <linux/sched.h> 20#include <linux/mm.h> 21#include <linux/smp.h> 22#include <linux/errno.h> 23#include <linux/ptrace.h> 24#include <linux/user.h> 25#include <linux/signal.h> 26 27#include <asm/uaccess.h> 28#include <asm/page.h> 29#include <asm/pgtable.h> 30#include <asm/processor.h> 31#include <asm/signal.h> 32 33/* cpu depend functions */ 34extern long h8300_get_reg(struct task_struct *task, int regno); 35extern int h8300_put_reg(struct task_struct *task, int regno, unsigned long data); 36 37 38void user_disable_single_step(struct task_struct *child) 39{ 40} 41 42/* 43 * does not yet catch signals sent when the child dies. 44 * in exit.c or in signal.c. 45 */ 46 47void ptrace_disable(struct task_struct *child) 48{ 49 user_disable_single_step(child); 50} 51 52long arch_ptrace(struct task_struct *child, long request, 53 unsigned long addr, unsigned long data) 54{ 55 int ret; 56 int regno = addr >> 2; 57 unsigned long __user *datap = (unsigned long __user *) data; 58 59 switch (request) { 60 /* read the word at location addr in the USER area. */ 61 case PTRACE_PEEKUSR: { 62 unsigned long tmp = 0; 63 64 if ((addr & 3) || addr >= sizeof(struct user)) { 65 ret = -EIO; 66 break ; 67 } 68 69 ret = 0; /* Default return condition */ 70 71 if (regno < H8300_REGS_NO) 72 tmp = h8300_get_reg(child, regno); 73 else { 74 switch (regno) { 75 case 49: 76 tmp = child->mm->start_code; 77 break ; 78 case 50: 79 tmp = child->mm->start_data; 80 break ; 81 case 51: 82 tmp = child->mm->end_code; 83 break ; 84 case 52: 85 tmp = child->mm->end_data; 86 break ; 87 default: 88 ret = -EIO; 89 } 90 } 91 if (!ret) 92 ret = put_user(tmp, datap); 93 break ; 94 } 95 96 /* when I and D space are separate, this will have to be fixed. */ 97 case PTRACE_POKEUSR: /* write the word at location addr in the USER area */ 98 if ((addr & 3) || addr >= sizeof(struct user)) { 99 ret = -EIO; 100 break ; 101 } 102 103 if (regno == PT_ORIG_ER0) { 104 ret = -EIO; 105 break ; 106 } 107 if (regno < H8300_REGS_NO) { 108 ret = h8300_put_reg(child, regno, data); 109 break ; 110 } 111 ret = -EIO; 112 break ; 113 114 case PTRACE_GETREGS: { /* Get all gp regs from the child. */ 115 int i; 116 unsigned long tmp; 117 for (i = 0; i < H8300_REGS_NO; i++) { 118 tmp = h8300_get_reg(child, i); 119 if (put_user(tmp, datap)) { 120 ret = -EFAULT; 121 break; 122 } 123 datap++; 124 } 125 ret = 0; 126 break; 127 } 128 129 case PTRACE_SETREGS: { /* Set all gp regs in the child. */ 130 int i; 131 unsigned long tmp; 132 for (i = 0; i < H8300_REGS_NO; i++) { 133 if (get_user(tmp, datap)) { 134 ret = -EFAULT; 135 break; 136 } 137 h8300_put_reg(child, i, tmp); 138 datap++; 139 } 140 ret = 0; 141 break; 142 } 143 144 default: 145 ret = ptrace_request(child, request, addr, data); 146 break; 147 } 148 return ret; 149} 150 151asmlinkage void do_syscall_trace(void) 152{ 153 if (!test_thread_flag(TIF_SYSCALL_TRACE)) 154 return; 155 if (!(current->ptrace & PT_PTRACED)) 156 return; 157 ptrace_notify(SIGTRAP | ((current->ptrace & PT_TRACESYSGOOD) 158 ? 0x80 : 0)); 159 /* 160 * this isn't the same as continuing with a signal, but it will do 161 * for normal use. strace only continues with a signal if the 162 * stopping signal is not SIGTRAP. -brl 163 */ 164 if (current->exit_code) { 165 send_sig(current->exit_code, current, 1); 166 current->exit_code = 0; 167 } 168} 169