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/* Chrysalide - Outil d'analyse de fichiers binaires
 * header.c - annotation des en-têtes de programme de binaires ELF
 *
 * Copyright (C) 2015 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 Foobar.  If not, see <http://www.gnu.org/licenses/>.
 */


#include "program.h"


#include <i18n.h>
#include <arch/raw.h>
#include <common/extstr.h>
#include <format/symbol.h>
#include <format/elf/elf-int.h>



/* Charge tous les symboles liés à un en-tête de programme ELF. */
static bool annotate_elf_program_header(GElfFormat *, SourceEndian, vmpa2t *);



/******************************************************************************
*                                                                             *
*  Paramètres  : format = description de l'exécutable à compléter.            *
*                endian = boutisme présentement utilisé.                      *
*                pos    = tête de lecture à déplacer. [OUT]                   *
*                                                                             *
*  Description : Charge tous les symboles liés à un en-tête de programme ELF. *
*                                                                             *
*  Retour      : Bilan de l'opération.                                        *
*                                                                             *
*  Remarques   : -                                                            *
*                                                                             *
******************************************************************************/

static bool annotate_elf_program_header(GElfFormat *format, SourceEndian endian, vmpa2t *pos)
{
    elf_phdr phdr;                          /* En-tête de programme ELF    */
    GBinContent *content;                   /* Contenu binaire à lire      */
    ImmOperandDisplay disp;                 /* Afficahge de valeur         */
    const char *text;                       /* Texte constant à insérer    */
    GArchInstruction *instr;                /* Instruction décodée         */
    GArchOperand *operand;                  /* Opérande à venir modifier   */
    GDbComment *comment;                    /* Définition de commentaire   */
    GBinSymbol *symbol;                     /* Symbole à intégrer          */
    char *dtext;                            /* Texte dynamique à créer     */
    bool filled;                            /* Suivi de mise en place      */

    if (!read_elf_program_header(format, get_phy_addr(pos), &phdr))
        return false;

    content = g_binary_format_get_content(G_BIN_FORMAT(format));

    /* Champ "p_type" */

    disp = IOD_DEC;

    switch (ELF_PHDR(format, phdr, p_type))
    {
        case PT_NULL:
            text = _("Segment type: unused");
            break;
        case PT_LOAD:
            text = _("Segment type: loadable program segment");
            break;
        case PT_DYNAMIC:
            text = _("Segment type: dynamic linking information");
            break;
        case PT_INTERP:
            text = _("Segment type: program interpreter");
            break;
        case PT_NOTE:
            text = _("Segment type: auxiliary information");
            break;
        case PT_SHLIB:
            text = _("Segment type: reserved");
            break;
        case PT_PHDR:
            text = _("Segment type: entry for header table itself");
            break;
        case PT_TLS:
            text = _("Segment type: thread-local storage segment");
            break;
        case PT_LOOS ... PT_HIOS:
            disp = IOD_HEX;
            switch (ELF_PHDR(format, phdr, p_type))
            {
                case PT_GNU_EH_FRAME:
                    text = _("Segment type: GCC .eh_frame_hdr segment");
                    break;
                case PT_GNU_STACK:
                    text = _("Segment type: indicates stack executability");
                    break;
                case PT_GNU_RELRO:
                    text = _("Segment type: read-only after relocation");
                    break;
                case PT_LOSUNW ... PT_HISUNW:
                    switch (ELF_PHDR(format, phdr, p_type))
                    {
                        case PT_SUNWSTACK:
                            text = _("Segment type: Sun Stack segment");
                            break;
                        default:
                            text = _("Segment type: Sun specific segment");
                            break;
                    }
                    break;
                default:
                    text = _("Segment type: OS-specific");
                    break;
            }
            break;
        case PT_LOPROC ... PT_HIPROC:
            disp = IOD_HEX;
            text = _("Segment type: processor-specific");
            break;
        default:
            disp = IOD_HEX;
            text = _("Segment type: unknown");
            break;
    }

    instr = g_raw_instruction_new_array(content, MDS_32_BITS, 1, pos, endian);

    SET_IMM_DISPLAY(instr, operand, 0, disp);

    ADD_RAW_AS_SYM(format, symbol, instr, comment, text);

    if (format->is_32b)
    {
        /* Champ "p_offset" */

        instr = g_raw_instruction_new_array(content, MDS_32_BITS, 1, pos, endian);

        ADD_RAW_AS_SYM(format, symbol, instr, comment, _("Segment file offset"));

        /* Champ "p_vaddr" */

        instr = g_raw_instruction_new_array(content, MDS_32_BITS, 1, pos, endian);

        ADD_RAW_AS_SYM(format, symbol, instr, comment, _("Segment virtual address"));

        /* Champ "p_paddr" */

        instr = g_raw_instruction_new_array(content, MDS_32_BITS, 1, pos, endian);

        ADD_RAW_AS_SYM(format, symbol, instr, comment, _("Segment physical address"));

        /* Champ "p_filesz" */

        instr = g_raw_instruction_new_array(content, MDS_32_BITS, 1, pos, endian);

        ADD_RAW_AS_SYM(format, symbol, instr, comment, _("Segment size in file"));

        /* Champ "p_memsz" */

        instr = g_raw_instruction_new_array(content, MDS_32_BITS, 1, pos, endian);

        ADD_RAW_AS_SYM(format, symbol, instr, comment, _("Segment size in memory"));

        /* Champ "p_flags" */

        dtext = strdup(_("Segment flags: "));
        filled = false;

        if (ELF_PHDR(format, phdr, p_flags) & PF_R)
        {
            dtext = stradd(dtext, "R");
            filled = true;
        }

        if (ELF_PHDR(format, phdr, p_flags) & PF_W)
        {
            dtext = stradd(dtext, "W");
            filled = true;
        }

        if (ELF_PHDR(format, phdr, p_flags) & PF_X)
        {
            dtext = stradd(dtext, "X");
            filled = true;
        }

        if (ELF_PHDR(format, phdr, p_flags) & PF_MASKOS)
            /* TODO */;

        if (ELF_PHDR(format, phdr, p_flags) & PF_MASKPROC)
            /* TODO */;

        if (!filled)
            dtext = stradd(dtext, _("none"));

        instr = g_raw_instruction_new_array(content, MDS_32_BITS, 1, pos, endian);

        ADD_RAW_AS_SYM(format, symbol, instr, comment, dtext);

        free(dtext);

        /* Champ "p_align" */

        instr = g_raw_instruction_new_array(content, MDS_32_BITS, 1, pos, endian);

        ADD_RAW_AS_SYM(format, symbol, instr, comment, _("Segment alignment"));

    }
    else
    {
        /* Champ "p_flags" */

        dtext = strdup(_("Segment flags: "));
        filled = false;

        if (ELF_PHDR(format, phdr, p_flags) & PF_R)
        {
            dtext = stradd(dtext, "R");
            filled = true;
        }

        if (ELF_PHDR(format, phdr, p_flags) & PF_W)
        {
            dtext = stradd(dtext, "W");
            filled = true;
        }

        if (ELF_PHDR(format, phdr, p_flags) & PF_X)
        {
            dtext = stradd(dtext, "X");
            filled = true;
        }

        if (ELF_PHDR(format, phdr, p_flags) & PF_MASKOS)
            /* TODO */;

        if (ELF_PHDR(format, phdr, p_flags) & PF_MASKPROC)
            /* TODO */;

        if (!filled)
            dtext = stradd(dtext, _("none"));

        instr = g_raw_instruction_new_array(content, MDS_32_BITS, 1, pos, endian);

        ADD_RAW_AS_SYM(format, symbol, instr, comment, dtext);

        free(dtext);

        /* Champ "p_offset" */

        instr = g_raw_instruction_new_array(content, MDS_64_BITS, 1, pos, endian);

        ADD_RAW_AS_SYM(format, symbol, instr, comment, _("Segment file offset"));

        /* Champ "p_vaddr" */

        instr = g_raw_instruction_new_array(content, MDS_64_BITS, 1, pos, endian);

        ADD_RAW_AS_SYM(format, symbol, instr, comment, _("Segment virtual address"));

        /* Champ "p_paddr" */

        instr = g_raw_instruction_new_array(content, MDS_64_BITS, 1, pos, endian);

        ADD_RAW_AS_SYM(format, symbol, instr, comment, _("Segment physical address"));

        /* Champ "p_filesz" */

        instr = g_raw_instruction_new_array(content, MDS_64_BITS, 1, pos, endian);

        ADD_RAW_AS_SYM(format, symbol, instr, comment, _("Segment size in file"));

        /* Champ "p_memsz" */

        instr = g_raw_instruction_new_array(content, MDS_64_BITS, 1, pos, endian);

        ADD_RAW_AS_SYM(format, symbol, instr, comment, _("Segment size in memory"));

        /* Champ "p_align" */

        instr = g_raw_instruction_new_array(content, MDS_64_BITS, 1, pos, endian);

        ADD_RAW_AS_SYM(format, symbol, instr, comment, _("Segment alignment"));

    }

    g_object_unref(G_OBJECT(content));

    return true;

}


/******************************************************************************
*                                                                             *
*  Paramètres  : format = description de l'exécutable à compléter.            *
*                status = barre de statut à tenir informée.                   *
*                                                                             *
*  Description : Charge tous les symboles liés aux en-têtes de programme ELF. *
*                                                                             *
*  Retour      : Bilan de l'opération.                                        *
*                                                                             *
*  Remarques   : -                                                            *
*                                                                             *
******************************************************************************/

bool annotate_elf_program_header_table(GElfFormat *format, GtkStatusStack *status)
{
    bool result;                            /* Bilan à retourner           */
    const elf_header *header;               /* En-tête principale          */
    SourceEndian endian;                    /* Boutisme utilisé            */
    phys_t offset;                          /* Tête de lecture du bbinaire */
    vmpa2t pos;                             /* Localisation des symboles   */
    uint16_t e_phnum;                       /* Nombre d'éléments 'Program' */
    activity_id_t msg;                      /* Message de progression      */
    uint16_t i;                             /* Boucle de parcours          */

    result = true;

    header = g_elf_format_get_header(format);
    endian = g_binary_format_get_endianness(G_BIN_FORMAT(format));

    offset = ELF_HDR(format, *header, e_phoff);

    if (!g_exe_format_translate_offset_into_vmpa(G_EXE_FORMAT(format), offset, &pos))
        return false;

    e_phnum = ELF_HDR(format, *header, e_phnum);

    msg = gtk_status_stack_add_activity(status, _("Writing annotations for all Elf program headers..."), e_phnum);

    for (i = 0; i < e_phnum && result; i++)
    {
        result = annotate_elf_program_header(format, endian, &pos);

        gtk_status_stack_update_activity_value(status, msg, 1);

    }

    gtk_status_stack_remove_activity(status, msg);

    return true;

}