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/*
* This file is part of ltrace.
* Copyright (C) 2011,2012,2013 Petr Machata, Red Hat Inc.
* Copyright (C) 2008,2009 Juan Cespedes
* Copyright (C) 2006 Ian Wienand
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License as
* published by the Free Software Foundation; either version 2 of the
* License, or (at your option) any later version.
*
* This program is distributed in the hope that it will be useful, but
* WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
* 02110-1301 USA
*/
#include "config.h"
#include <sys/types.h>
#include <sys/ptrace.h>
#include <errno.h>
#include <asm/ptrace_offsets.h>
#include <asm/rse.h>
#include <stddef.h>
#include "proc.h"
#include "common.h"
void *
get_instruction_pointer(struct process *proc)
{
unsigned long ip = ptrace(PTRACE_PEEKUSER, proc->pid, PT_CR_IIP, 0);
unsigned long slot =
(ptrace(PTRACE_PEEKUSER, proc->pid, PT_CR_IPSR, 0) >> 41) & 3;
return (void *)(ip | slot);
}
void
set_instruction_pointer(struct process *proc, void *addr)
{
unsigned long newip = (unsigned long)addr;
unsigned long slot = (unsigned long)addr & 0xf;
unsigned long psr = ptrace(PTRACE_PEEKUSER, proc->pid, PT_CR_IPSR, 0);
psr &= ~(3UL << 41);
psr |= (slot & 0x3) << 41;
newip &= ~0xfUL;
ptrace(PTRACE_POKEUSER, proc->pid, PT_CR_IIP, (long)newip);
ptrace(PTRACE_POKEUSER, proc->pid, PT_CR_IPSR, psr);
}
void *
get_stack_pointer(struct process *proc)
{
long l = ptrace(PTRACE_PEEKUSER, proc->pid, PT_R12, 0);
if (l == -1 && errno)
return NULL;
return (void *)l;
}
void *
get_return_addr(struct process *proc, void *stack_pointer)
{
long l = ptrace(PTRACE_PEEKUSER, proc->pid, PT_B0, 0);
if (l == -1 && errno)
return NULL;
return (void *)l;
}
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