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      1 /*
      2  * This file is part of ltrace.
      3  * Copyright (C) 2013 Petr Machata, Red Hat Inc.
      4  * Copyright (C) 2004,2008,2009 Juan Cespedes
      5  *
      6  * This program is free software; you can redistribute it and/or
      7  * modify it under the terms of the GNU General Public License as
      8  * published by the Free Software Foundation; either version 2 of the
      9  * License, or (at your option) any later version.
     10  *
     11  * This program is distributed in the hope that it will be useful, but
     12  * WITHOUT ANY WARRANTY; without even the implied warranty of
     13  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
     14  * General Public License for more details.
     15  *
     16  * You should have received a copy of the GNU General Public License
     17  * along with this program; if not, write to the Free Software
     18  * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
     19  * 02110-1301 USA
     20  */
     21 
     22 #include "config.h"
     23 
     24 #include <sys/types.h>
     25 #include <sys/ptrace.h>
     26 #include <asm/ptrace.h>
     27 
     28 #include "proc.h"
     29 #include "common.h"
     30 
     31 #if (!defined(PTRACE_PEEKUSER) && defined(PTRACE_PEEKUSR))
     32 # define PTRACE_PEEKUSER PTRACE_PEEKUSR
     33 #endif
     34 
     35 #if (!defined(PTRACE_POKEUSER) && defined(PTRACE_POKEUSR))
     36 # define PTRACE_POKEUSER PTRACE_POKEUSR
     37 #endif
     38 
     39 void *
     40 get_instruction_pointer(struct process *proc)
     41 {
     42 	return (void *)ptrace(PTRACE_PEEKUSER, proc->pid, 64 /* REG_PC */ , 0);
     43 }
     44 
     45 void
     46 set_instruction_pointer(struct process *proc, void *addr)
     47 {
     48 	ptrace(PTRACE_POKEUSER, proc->pid, 64 /* REG_PC */ , addr);
     49 }
     50 
     51 void *
     52 get_stack_pointer(struct process *proc)
     53 {
     54 	return (void *)ptrace(PTRACE_PEEKUSER, proc->pid, 30 /* REG_FP */ , 0);
     55 }
     56 
     57 void *
     58 get_return_addr(struct process *proc, void *stack_pointer)
     59 {
     60 	return (void *)ptrace(PTRACE_PEEKUSER, proc->pid, 26 /* RA */ , 0);
     61 }
     62