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/*
* This file is part of ltrace.
* Copyright (C) 2010,2011,2012 Petr Machata, Red Hat Inc.
* Copyright (C) 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/reg.h>
#include <sys/wait.h>
#include <assert.h>
#include <errno.h>
#include <stdlib.h>
#include "backend.h"
#include "debug.h"
#include "proc.h"
#include "ptrace.h"
#include "type.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 ORIG_XAX (8 * ORIG_RAX)
#else
# define ORIG_XAX (4 * ORIG_EAX)
#endif
#ifdef __x86_64__
static const int x86_64 = 1;
#else
static const int x86_64 = 0;
#endif
void
get_arch_dep(struct process *proc)
{
/* Unfortunately there are still remnants of mask_32bit uses
* around. */
if (proc->e_machine == EM_X86_64) {
proc->mask_32bit = 0;
proc->personality = 1;
} else if (x86_64) { /* x86_64/i386 */
proc->mask_32bit = 1;
proc->personality = 0;
} else {
proc->mask_32bit = 0;
proc->personality = 0;
}
}
/* Returns 1 if syscall, 2 if sysret, 0 otherwise.
*/
int
syscall_p(struct process *proc, int status, int *sysnum)
{
if (WIFSTOPPED(status)
&& WSTOPSIG(status) == (SIGTRAP | proc->tracesysgood)) {
struct callstack_element *elem = NULL;
if (proc->callstack_depth > 0)
elem = proc->callstack + proc->callstack_depth - 1;
long int ret = ptrace(PTRACE_PEEKUSER, proc->pid, ORIG_XAX, 0);
if (ret == -1) {
if (errno)
return -1;
/* Otherwise, ORIG_RAX == -1 means that the
* system call should not be restarted. In
* that case rely on what we have on
* stack. */
if (elem != NULL && elem->is_syscall)
ret = elem->c_un.syscall;
}
*sysnum = ret;
debug(DEBUG_FUNCTION, "sysnum=%ld %p %d", ret,
get_instruction_pointer(proc), errno);
if (elem != NULL && elem->is_syscall
&& elem->c_un.syscall == *sysnum)
return 2;
if (*sysnum >= 0)
return 1;
}
return 0;
}
size_t
arch_type_sizeof(struct process *proc, struct arg_type_info *info)
{
if (proc == NULL)
return (size_t)-2;
switch (info->type) {
case ARGTYPE_VOID:
return 0;
case ARGTYPE_CHAR:
return 1;
case ARGTYPE_SHORT:
case ARGTYPE_USHORT:
return 2;
case ARGTYPE_INT:
case ARGTYPE_UINT:
return 4;
case ARGTYPE_LONG:
case ARGTYPE_ULONG:
case ARGTYPE_POINTER:
return proc->e_machine == EM_X86_64 ? 8 : 4;
case ARGTYPE_FLOAT:
return 4;
case ARGTYPE_DOUBLE:
return 8;
case ARGTYPE_ARRAY:
case ARGTYPE_STRUCT:
/* Use default value. */
return (size_t)-2;
default:
assert(info->type != info->type);
abort();
}
}
size_t
arch_type_alignof(struct process *proc, struct arg_type_info *info)
{
if (proc == NULL)
return (size_t)-2;
switch (info->type) {
default:
assert(info->type != info->type);
abort();
break;
case ARGTYPE_CHAR:
return 1;
case ARGTYPE_SHORT:
case ARGTYPE_USHORT:
return 2;
case ARGTYPE_INT:
case ARGTYPE_UINT:
return 4;
case ARGTYPE_LONG:
case ARGTYPE_ULONG:
case ARGTYPE_POINTER:
return proc->e_machine == EM_X86_64 ? 8 : 4;
case ARGTYPE_FLOAT:
return 4;
case ARGTYPE_DOUBLE:
return proc->e_machine == EM_X86_64 ? 8 : 4;
case ARGTYPE_ARRAY:
case ARGTYPE_STRUCT:
/* Use default value. */
return (size_t)-2;
}
}
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