1/* 2 * This file is part of ltrace. 3 * Copyright (C) 2013 Petr Machata, Red Hat Inc. 4 * Copyright (C) 2008,2009 Juan Cespedes 5 * Copyright (C) 2006 Eric Vaitl, Cisco Systems, Inc. 6 * 7 * This program is free software; you can redistribute it and/or 8 * modify it under the terms of the GNU General Public License as 9 * published by the Free Software Foundation; either version 2 of the 10 * License, or (at your option) any later version. 11 * 12 * This program is distributed in the hope that it will be useful, but 13 * WITHOUT ANY WARRANTY; without even the implied warranty of 14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU 15 * General Public License for more details. 16 * 17 * You should have received a copy of the GNU General Public License 18 * along with this program; if not, write to the Free Software 19 * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 20 * 02110-1301 USA 21 */ 22 23#include "config.h" 24 25#include <stddef.h> 26#include <sys/types.h> 27#include <sys/ptrace.h> 28#include <asm/ptrace.h> 29 30#include "proc.h" 31#include "common.h" 32#include "mips.h" 33 34#if (!defined(PTRACE_PEEKUSER) && defined(PTRACE_PEEKUSR)) 35# define PTRACE_PEEKUSER PTRACE_PEEKUSR 36#endif 37 38#if (!defined(PTRACE_POKEUSER) && defined(PTRACE_POKEUSR)) 39# define PTRACE_POKEUSER PTRACE_POKEUSR 40#endif 41 42/** 43 \addtogroup mips 44 @{ 45 */ 46 47 48/** 49 \param proc The process to work on. 50 \return The current instruction pointer. 51 */ 52void * 53get_instruction_pointer(struct process *proc) 54{ 55 return (void *)ptrace(PTRACE_PEEKUSER, proc->pid, off_pc, 0); 56} 57 58/** 59 \param proc The process to work on. 60 \param addr The address to set to. 61 62 Called by \c continue_after_breakpoint(). 63 64 \todo Our mips kernel ptrace doesn't support PTRACE_SINGLESTEP, so 65 we \c continue_process() after a breakpoint. Check if this is OK. 66 */ 67void 68set_instruction_pointer(struct process *proc, void *addr) 69{ 70 ptrace(PTRACE_POKEUSER, proc->pid, off_pc, addr); 71} 72 73/** 74 \param proc The process to work on. 75 \return The current stack pointer. 76 */ 77void * 78get_stack_pointer(struct process *proc) 79{ 80 return (void *)ptrace(PTRACE_PEEKUSER, proc->pid, off_sp, 0); 81} 82 83/** 84 \param proc The process to work on. 85 \param stack_pointer The current stack pointer for proc 86 \return The current return address. 87 88 Called by \c handle_breakpoint(). 89 90 Mips uses r31 for the return address, so the stack_pointer is 91 unused. 92 */ 93void * 94get_return_addr(struct process *proc, void *stack_pointer) 95{ 96 return (void *)ptrace(PTRACE_PEEKUSER, proc->pid, off_lr, 0); 97} 98