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/*
* This file is part of ltrace.
* Copyright (C) 2012,2013 Petr Machata, Red Hat Inc.
* Copyright (C) 1998,2002,2004,2008,2009 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 <sys/reg.h>
#include <errno.h>
#include <stdio.h>
#include <string.h>
#include "backend.h"
#include "proc.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
#ifdef __x86_64__
# define XIP (8 * RIP)
# define XSP (8 * RSP)
#else
# define XIP (4 * EIP)
# define XSP (4 * UESP)
#endif
static arch_addr_t
conv_32(arch_addr_t val)
{
/* XXX Drop the multiple double casts when arch_addr_t
* becomes integral. */
return (arch_addr_t)(uintptr_t)(uint32_t)(uintptr_t)val;
}
void *
get_instruction_pointer(struct process *proc)
{
long int ret = ptrace(PTRACE_PEEKUSER, proc->pid, XIP, 0);
if (proc->e_machine == EM_386)
ret &= 0xffffffff;
return (void *)ret;
}
void
set_instruction_pointer(struct process *proc, arch_addr_t addr)
{
if (proc->e_machine == EM_386)
addr = conv_32(addr);
ptrace(PTRACE_POKEUSER, proc->pid, XIP, addr);
}
void *
get_stack_pointer(struct process *proc)
{
long sp = ptrace(PTRACE_PEEKUSER, proc->pid, XSP, 0);
if (sp == -1 && errno) {
fprintf(stderr, "Couldn't read SP register: %s\n",
strerror(errno));
return NULL;
}
/* XXX Drop the multiple double casts when arch_addr_t
* becomes integral. */
arch_addr_t ret = (arch_addr_t)(uintptr_t)sp;
if (proc->e_machine == EM_386)
ret = conv_32(ret);
return ret;
}
void *
get_return_addr(struct process *proc, void *sp)
{
long a = ptrace(PTRACE_PEEKTEXT, proc->pid, sp, 0);
if (a == -1 && errno) {
fprintf(stderr, "Couldn't read return value: %s\n",
strerror(errno));
return NULL;
}
/* XXX Drop the multiple double casts when arch_addr_t
* becomes integral. */
arch_addr_t ret = (arch_addr_t)(uintptr_t)a;
if (proc->e_machine == EM_386)
ret = conv_32(ret);
return ret;
}
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