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/*
* This file is part of ltrace.
* Copyright (C) 1998,2002,2004,2008,2009 Juan Cespedes
* Copyright (C) 2009 Juan Cespedes
*
* 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 <asm/ptrace.h>
#include "proc.h"
#include "common.h"
#if (!defined(PTRACE_PEEKUSER) && defined(PTRACE_PEEKUSR))
# define PTRACE_PEEKUSER PTRACE_PEEKUSR
#endif
#if (!defined(PTRACE_POKEUSER) && defined(PTRACE_POKEUSR))
# define PTRACE_POKEUSER PTRACE_POKEUSR
#endif
#define off_pc ((void *)60)
#define off_lr ((void *)56)
#define off_sp ((void *)52)
void *
get_instruction_pointer(Process *proc) {
return (void *)ptrace(PTRACE_PEEKUSER, proc->pid, off_pc, 0);
}
void
set_instruction_pointer(Process *proc, void *addr) {
ptrace(PTRACE_POKEUSER, proc->pid, off_pc, addr);
}
void *
get_stack_pointer(Process *proc) {
return (void *)ptrace(PTRACE_PEEKUSER, proc->pid, off_sp, 0);
}
/* really, this is given the *stack_pointer expecting
* a CISC architecture; in our case, we don't need that */
void *
get_return_addr(Process *proc, void *stack_pointer) {
long addr = ptrace(PTRACE_PEEKUSER, proc->pid, off_lr, 0);
/* Remember & unset the thumb mode bit. XXX This is really a
* bit of a hack, as we assume that the following
* insert_breakpoint call will be related to this address.
* This interface should really be get_return_breakpoint, or
* maybe install_return_breakpoint. */
proc->thumb_mode = addr & 1;
if (proc->thumb_mode)
addr &= ~1;
return (void *)addr;
}
void
set_return_addr(Process *proc, void *addr) {
long iaddr = (int)addr | proc->thumb_mode;
ptrace(PTRACE_POKEUSER, proc->pid, off_lr, (void *)iaddr);
}
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