/* Chrysalide - Outil d'analyse de fichiers binaires
* banked.c - aides auxiliaires relatives aux registres de banque ARMv7
*
* Copyright (C) 2018 Cyrille Bagard
*
* This file is part of Chrysalide.
*
* Chrysalide 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 3 of the License, or
* (at your option) any later version.
*
* Chrysalide 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 Chrysalide. If not, see .
*/
#include "banked.h"
#include
#include
#include "../register-int.h"
/* ------------------------- GESTION UNITAIRE DES REGISTRES ------------------------- */
/* Représentation d'un registre de banque ARMv7 (instance) */
struct _GArmV7BankedRegister
{
GArmV7Register parent; /* Instance parente */
};
/* Représentation d'un registre de banque ARMv7 (classe) */
struct _GArmV7BankedRegisterClass
{
GArmV7RegisterClass parent; /* Classe parente */
};
#define MAX_REGNAME_LEN 9
/* Initialise la classe des registres de banque ARMv7. */
static void g_armv7_banked_register_class_init(GArmV7BankedRegisterClass *);
/* Initialise une instance de registre de banque ARMv7. */
static void g_armv7_banked_register_init(GArmV7BankedRegister *);
/* Supprime toutes les références externes. */
static void g_armv7_banked_register_dispose(GArmV7BankedRegister *);
/* Procède à la libération totale de la mémoire. */
static void g_armv7_banked_register_finalize(GArmV7BankedRegister *);
/* Traduit un registre en version humainement lisible. */
static void g_armv7_banked_register_print(const GArmV7BankedRegister *, GBufferLine *);
/* Convertit en indice des paramètres d'encodage. */
static BankedRegisterTarget convert_r_sysm_to_target(uint8_t, uint8_t);
/* Crée une réprésentation de registre de banque ARMv7. */
static GArchRegister *_g_armv7_banked_register_new(BankedRegisterTarget);
/* --------------------- TRANSPOSITIONS VIA CACHE DES REGISTRES --------------------- */
/* Charge un registre depuis une mémoire tampon. */
static GArchRegister *g_armv7_banked_register_unserialize(GArmV7BankedRegister *, GAsmStorage *, packed_buffer_t *);
/* ------------------------ GESTION SOUS FORME DE SINGLETONS ------------------------ */
/* Conservation des registres utilisés */
static GArchRegister **_armv7_banked_registers = NULL;
static size_t _av7_banked_reg_count = 0;
G_LOCK_DEFINE_STATIC(_av7_banked_reg_mutex);
/* Fournit le singleton associé à un registre de banque ARMv7. */
static GArchRegister *get_armv7_banked_register(BankedRegisterTarget);
/* ---------------------------------------------------------------------------------- */
/* GESTION UNITAIRE DES REGISTRES */
/* ---------------------------------------------------------------------------------- */
/* Indique le type défini pour une représentation d'un registre de banque ARMv7. */
G_DEFINE_TYPE(GArmV7BankedRegister, g_armv7_banked_register, G_TYPE_ARMV7_REGISTER);
/******************************************************************************
* *
* Paramètres : klass = classe à initialiser. *
* *
* Description : Initialise la classe des registres de banque ARMv7. *
* *
* Retour : - *
* *
* Remarques : - *
* *
******************************************************************************/
static void g_armv7_banked_register_class_init(GArmV7BankedRegisterClass *klass)
{
GObjectClass *object_class; /* Autre version de la classe */
GArchRegisterClass *reg_class; /* Classe de haut niveau */
object_class = G_OBJECT_CLASS(klass);
reg_class = G_ARCH_REGISTER_CLASS(klass);
object_class->dispose = (GObjectFinalizeFunc/* ! */)g_armv7_banked_register_dispose;
object_class->finalize = (GObjectFinalizeFunc)g_armv7_banked_register_finalize;
reg_class->print = (reg_print_fc)g_armv7_banked_register_print;
reg_class->unserialize = (reg_unserialize_fc)g_armv7_banked_register_unserialize;
}
/******************************************************************************
* *
* Paramètres : reg = instance à initialiser. *
* *
* Description : Initialise une instance de registre de banque ARMv7. *
* *
* Retour : - *
* *
* Remarques : - *
* *
******************************************************************************/
static void g_armv7_banked_register_init(GArmV7BankedRegister *reg)
{
}
/******************************************************************************
* *
* Paramètres : reg = instance d'objet GLib à traiter. *
* *
* Description : Supprime toutes les références externes. *
* *
* Retour : - *
* *
* Remarques : - *
* *
******************************************************************************/
static void g_armv7_banked_register_dispose(GArmV7BankedRegister *reg)
{
G_OBJECT_CLASS(g_armv7_banked_register_parent_class)->dispose(G_OBJECT(reg));
}
/******************************************************************************
* *
* Paramètres : reg = instance d'objet GLib à traiter. *
* *
* Description : Procède à la libération totale de la mémoire. *
* *
* Retour : - *
* *
* Remarques : - *
* *
******************************************************************************/
static void g_armv7_banked_register_finalize(GArmV7BankedRegister *reg)
{
G_OBJECT_CLASS(g_armv7_banked_register_parent_class)->finalize(G_OBJECT(reg));
}
/******************************************************************************
* *
* Paramètres : reg = registre à transcrire. *
* line = ligne tampon où imprimer l'opérande donné. *
* *
* Description : Traduit un registre en version humainement lisible. *
* *
* Retour : - *
* *
* Remarques : - *
* *
******************************************************************************/
static void g_armv7_banked_register_print(const GArmV7BankedRegister *reg, GBufferLine *line)
{
BankedRegisterTarget target; /* Registre ciblé */
char key[MAX_REGNAME_LEN]; /* Mot clef principal */
size_t klen; /* Taille de ce mot clef */
target = G_ARM_REGISTER(reg)->index;
switch (target)
{
case BRT_R8_USR:
klen = snprintf(key, MAX_REGNAME_LEN, "R8_usr");
break;
case BRT_R9_USR:
klen = snprintf(key, MAX_REGNAME_LEN, "R9_usr");
break;
case BRT_R10_USR:
klen = snprintf(key, MAX_REGNAME_LEN, "R10_usr");
break;
case BRT_R11_USR:
klen = snprintf(key, MAX_REGNAME_LEN, "R11_usr");
break;
case BRT_R12_USR:
klen = snprintf(key, MAX_REGNAME_LEN, "R12_usr");
break;
case BRT_SP_USR:
klen = snprintf(key, MAX_REGNAME_LEN, "SP_usr");
break;
case BRT_LR_USR:
klen = snprintf(key, MAX_REGNAME_LEN, "LR_usr");
break;
case BRT_R8_FIQ:
klen = snprintf(key, MAX_REGNAME_LEN, "R8_fiq");
break;
case BRT_R9_FIQ:
klen = snprintf(key, MAX_REGNAME_LEN, "R9_fiq");
break;
case BRT_R10_FIQ:
klen = snprintf(key, MAX_REGNAME_LEN, "R10_fiq");
break;
case BRT_R11_FIQ:
klen = snprintf(key, MAX_REGNAME_LEN, "R11_fiq");
break;
case BRT_R12_FIQ:
klen = snprintf(key, MAX_REGNAME_LEN, "R12_fiq");
break;
case BRT_SP_FIQ:
klen = snprintf(key, MAX_REGNAME_LEN, "SP_fiq");
break;
case BRT_LR_FIQ:
klen = snprintf(key, MAX_REGNAME_LEN, "LR_fiq");
break;
case BRT_LR_IRQ:
klen = snprintf(key, MAX_REGNAME_LEN, "LR_irq");
break;
case BRT_SP_IRQ:
klen = snprintf(key, MAX_REGNAME_LEN, "SP_irq");
break;
case BRT_LR_SVC:
klen = snprintf(key, MAX_REGNAME_LEN, "LR_svc");
break;
case BRT_SP_SVC:
klen = snprintf(key, MAX_REGNAME_LEN, "SP_svc");
break;
case BRT_LR_ABT:
klen = snprintf(key, MAX_REGNAME_LEN, "LR_abt");
break;
case BRT_SP_ABT:
klen = snprintf(key, MAX_REGNAME_LEN, "SP_abt");
break;
case BRT_LR_UND:
klen = snprintf(key, MAX_REGNAME_LEN, "LR_und");
break;
case BRT_SP_UND:
klen = snprintf(key, MAX_REGNAME_LEN, "SP_und");
break;
case BRT_LR_MON:
klen = snprintf(key, MAX_REGNAME_LEN, "LR_mon");
break;
case BRT_SP_MON:
klen = snprintf(key, MAX_REGNAME_LEN, "SP_mon");
break;
case BRT_ELR_HYP:
klen = snprintf(key, MAX_REGNAME_LEN, "ELR_hyp");
break;
case BRT_SP_HYP:
klen = snprintf(key, MAX_REGNAME_LEN, "SP_hyp");
break;
case BRT_SPSR_IRQ:
klen = snprintf(key, MAX_REGNAME_LEN, "SPSR_irq");
break;
case BRT_SPSR_SVC:
klen = snprintf(key, MAX_REGNAME_LEN, "SPSR_svc");
break;
default:
klen = snprintf(key, MAX_REGNAME_LEN, "???");
break;
}
g_buffer_line_append_text(line, DLC_ASSEMBLY, key, klen, RTT_REGISTER, NULL);
}
/******************************************************************************
* *
* Paramètres : r = premier champ à interpréter. *
* sysm = second champ à interpréter. *
* *
* Description : Convertit en indice des paramètres d'encodage. *
* *
* Retour : Registre ciblé ou BRT_COUNT en cas d'invalidité. *
* *
* Remarques : - *
* *
******************************************************************************/
static BankedRegisterTarget convert_r_sysm_to_target(uint8_t r, uint8_t sysm)
{
BankedRegisterTarget result; /* Cible effective à retourner */
uint8_t sysm_20; /* Décomposition en bits #1 */
uint8_t sysm_43; /* Décomposition en bits #2 */
result = BRT_COUNT;
sysm_20 = (sysm & 0x3);
sysm_43 = (sysm & 0x18) >> 3;
if (r == 0)
{
switch (sysm_43)
{
case 0b00:
switch (sysm_20)
{
case 0b000:
result = BRT_R8_USR;
break;
case 0b001:
result = BRT_R9_USR;
break;
case 0b010:
result = BRT_R10_USR;
break;
case 0b011:
result = BRT_R11_USR;
break;
case 0b100:
result = BRT_R12_USR;
break;
case 0b101:
result = BRT_SP_USR;
break;
case 0b110:
result = BRT_LR_USR;
break;
}
break;
case 0b01:
switch (sysm_20)
{
case 0b000:
result = BRT_R8_FIQ;
break;
case 0b001:
result = BRT_R9_FIQ;
break;
case 0b010:
result = BRT_R10_FIQ;
break;
case 0b011:
result = BRT_R11_FIQ;
break;
case 0b100:
result = BRT_R12_FIQ;
break;
case 0b101:
result = BRT_SP_FIQ;
break;
case 0b110:
result = BRT_LR_FIQ;
break;
}
break;
case 0b10:
switch (sysm_20)
{
case 0b000:
result = BRT_LR_IRQ;
break;
case 0b001:
result = BRT_SP_IRQ;
break;
case 0b010:
result = BRT_LR_SVC;
break;
case 0b011:
result = BRT_SP_SVC;
break;
case 0b100:
result = BRT_LR_ABT;
break;
case 0b101:
result = BRT_SP_ABT;
break;
case 0b110:
result = BRT_LR_UND;
break;
case 0b111:
result = BRT_SP_UND;
break;
}
break;
case 0b11:
switch (sysm_20)
{
case 0b100:
result = BRT_LR_MON;
break;
case 0b101:
result = BRT_SP_MON;
break;
case 0b110:
result = BRT_ELR_HYP;
break;
case 0b111:
result = BRT_SP_HYP;
break;
}
break;
}
}
else if (r == 1)
{
switch (sysm_43)
{
case 0b10:
switch (sysm_20)
{
case 0b000:
result = BRT_SPSR_IRQ;
break;
case 0b010:
result = BRT_SPSR_SVC;
break;
}
break;
}
}
return result;
}
/******************************************************************************
* *
* Paramètres : target = registre effectivement ciblé. *
* *
* Description : Crée une réprésentation de registre de banque ARMv7. *
* *
* Retour : Adresse de la structure mise en place. *
* *
* Remarques : - *
* *
******************************************************************************/
static GArchRegister *_g_armv7_banked_register_new(BankedRegisterTarget target)
{
GArmV7BankedRegister *result; /* Structure à retourner */
if (target >= BRT_COUNT)
goto bad_values;
result = g_object_new(G_TYPE_ARMV7_BANKED_REGISTER, NULL);
G_ARM_REGISTER(result)->index = target;
return G_ARCH_REGISTER(result);
bad_values:
return NULL;
}
/******************************************************************************
* *
* Paramètres : r = premier champ à interpréter. *
* sysm = second champ à interpréter. *
* *
* Description : Crée une réprésentation de registre de banque ARMv7. *
* *
* Retour : Adresse de la structure mise en place. *
* *
* Remarques : - *
* *
******************************************************************************/
GArchRegister *g_armv7_banked_register_new(uint8_t r, uint8_t sysm)
{
GArchRegister *result; /* Structure à retourner */
BankedRegisterTarget target; /* Registre effectivement ciblé*/
target = convert_r_sysm_to_target(r, sysm);
if (target >= BRT_COUNT)
goto bad_values;
result = get_armv7_banked_register(target);
return result;
bad_values:
return NULL;
}
/******************************************************************************
* *
* Paramètres : reg = registre à consulter. *
* *
* Description : Fournit le registre de banque ciblé. *
* *
* Retour : - *
* *
* Remarques : - *
* *
******************************************************************************/
BankedRegisterTarget g_armv7_banked_register_get_target(const GArmV7BankedRegister *reg)
{
BankedRegisterTarget result; /* Cible à retourner */
result = G_ARM_REGISTER(reg)->index;
return result;
}
/* ---------------------------------------------------------------------------------- */
/* TRANSPOSITIONS VIA CACHE DES OPERANDES */
/* ---------------------------------------------------------------------------------- */
/******************************************************************************
* *
* Paramètres : reg = registre d'architecture à constituer. *
* storage = mécanisme de sauvegarde à manipuler. *
* pbuf = zone tampon à remplir. *
* *
* Description : Charge un registre depuis une mémoire tampon. *
* *
* Retour : Bilan de l'opération. *
* *
* Remarques : - *
* *
******************************************************************************/
static GArchRegister *g_armv7_banked_register_unserialize(GArmV7BankedRegister *reg, GAsmStorage *storage, packed_buffer_t *pbuf)
{
GArchRegister *result; /* Instance à retourner */
uint8_t index; /* Indice du registre */
bool status; /* Bilan d'une extraction */
GArchRegisterClass *parent; /* Classe parente à consulter */
status = extract_packed_buffer(pbuf, &index, sizeof(uint8_t), false);
if (status)
{
result = get_armv7_banked_register(index);
if (result == NULL)
g_object_unref(G_OBJECT(reg));
}
else
{
g_object_unref(G_OBJECT(reg));
result = NULL;
}
if (result != NULL)
{
parent = G_ARCH_REGISTER_CLASS(g_armv7_banked_register_parent_class);
result = parent->unserialize(result, storage, pbuf);
}
return result;
}
/* ---------------------------------------------------------------------------------- */
/* GESTION SOUS FORME DE SINGLETONS */
/* ---------------------------------------------------------------------------------- */
/******************************************************************************
* *
* Paramètres : target = registre effectivement ciblé. *
* *
* Description : Fournit le singleton associé à un registre de banque ARMv7. *
* *
* Retour : Adresse de la structure mise en place. *
* *
* Remarques : - *
* *
******************************************************************************/
static GArchRegister *get_armv7_banked_register(BankedRegisterTarget target)
{
GArchRegister *result; /* Structure à retourner */
size_t new_count; /* Nouvelle taille à considérer*/
size_t i; /* Boucle de parcours */
G_LOCK(_av7_banked_reg_mutex);
if (target >= _av7_banked_reg_count)
{
/**
* On valide déjà le fait que le registre puisse être créé
* avant de réaliser une allocation potentiellement énorme
* avec un indice démesuré.
*/
result = _g_armv7_banked_register_new(target);
if (result == NULL)
goto bad_values;
new_count = target + 1;
_armv7_banked_registers = realloc(_armv7_banked_registers, new_count * sizeof(GArchRegister *));
for (i = _av7_banked_reg_count; i < new_count; i++)
_armv7_banked_registers[i] = NULL;
_av7_banked_reg_count = new_count;
}
else
result = NULL;
if (_armv7_banked_registers[target] == NULL)
{
if (result != NULL)
_armv7_banked_registers[target] = result;
else
_armv7_banked_registers[target] = _g_armv7_banked_register_new(target);
}
result = _armv7_banked_registers[target];
bad_values:
G_UNLOCK(_av7_banked_reg_mutex);
if (result != NULL)
g_object_ref(G_OBJECT(result));
return result;
}
/******************************************************************************
* *
* Paramètres : - *
* *
* Description : Vide totalement le cache des registres de banque ARMv7. *
* *
* Retour : - *
* *
* Remarques : - *
* *
******************************************************************************/
void clean_armv7_banked_register_cache(void)
{
size_t i; /* Boucle de parcours */
G_LOCK(_av7_banked_reg_mutex);
for (i = 0; i < _av7_banked_reg_count; i++)
g_clear_object(&_armv7_banked_registers[i]);
if (_armv7_banked_registers != NULL)
free(_armv7_banked_registers);
_armv7_banked_registers = NULL;
_av7_banked_reg_count = 0;
G_UNLOCK(_av7_banked_reg_mutex);
}