elflwlv.c

开放源码的编译器open watcom 1.6.0版的源代码

/****************************************************************************
*
*                            Open Watcom Project
*
*    Portions Copyright (c) 1983-2002 Sybase, Inc. All Rights Reserved.
*
*  ========================================================================
*
*    This file contains Original Code and/or Modifications of Original
*    Code as defined in and that are subject to the Sybase Open Watcom
*    Public License version 1.0 (the 'License'). You may not use this file
*    except in compliance with the License. BY USING THIS FILE YOU AGREE TO
*    ALL TERMS AND CONDITIONS OF THE LICENSE. A copy of the License is
*    provided with the Original Code and Modifications, and is also
*    available at www.sybase.com/developer/opensource.
*
*    The Original Code and all software distributed under the License are
*    distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
*    EXPRESS OR IMPLIED, AND SYBASE AND ALL CONTRIBUTORS HEREBY DISCLAIM
*    ALL SUCH WARRANTIES, INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF
*    MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR
*    NON-INFRINGEMENT. Please see the License for the specific language
*    governing rights and limitations under the License.
*
*  ========================================================================
*
* Description:  ELF format low level (symbols and relocations) processing.
*
****************************************************************************/


#include <assert.h>
#include "walloca.h"
#include "elflwlv.h"
#include "orlhash.h"
#ifdef _BSD_SOURCE
#define stricmp strcasecmp
#endif

static void fix_sym_byte_order( elf_file_handle elf_file_hnd, Elf32_Sym *e_sym )
{
    // note that one of the branches will always get compiled out,
    // depending on host endianness
    if( elf_file_hnd->flags & ORL_FILE_FLAG_BIG_ENDIAN ) {
        CONV_BE_32( e_sym->st_name );
        CONV_BE_32( e_sym->st_value );
        CONV_BE_32( e_sym->st_size );
        CONV_BE_16( e_sym->st_shndx );
    } else {
        CONV_LE_32( e_sym->st_name );
        CONV_LE_32( e_sym->st_value );
        CONV_LE_32( e_sym->st_size );
        CONV_LE_16( e_sym->st_shndx );
    }
}


static void fix_rel_byte_order( elf_file_handle elf_file_hnd, Elf32_Rel *e_rel )
{
    // note that one of the branches will always get compiled out,
    // depending on host endianness
    if( elf_file_hnd->flags & ORL_FILE_FLAG_BIG_ENDIAN ) {
        CONV_BE_32( e_rel->r_offset );
        CONV_BE_32( e_rel->r_info );
    } else {
        CONV_LE_32( e_rel->r_offset );
        CONV_LE_32( e_rel->r_info );
    }
}


static void fix_rela_byte_order( elf_file_handle elf_file_hnd, Elf32_Rela *e_rela )
{
    // note that one of the branches will always get compiled out,
    // depending on host endianness
    if( elf_file_hnd->flags & ORL_FILE_FLAG_BIG_ENDIAN ) {
        CONV_BE_32( e_rela->r_offset );
        CONV_BE_32( e_rela->r_info );
        CONV_BE_32( e_rela->r_addend );
    } else {
        CONV_LE_32( e_rela->r_offset );
        CONV_LE_32( e_rela->r_info );
        CONV_LE_32( e_rela->r_addend );
    }
}


orl_return ElfCreateSymbolHandles( elf_sec_handle elf_sec_hnd )
{
    int                 loop;
    int                 num_syms;
    elf_symbol_handle   current;
    Elf32_Sym           *current_sym;

    num_syms = elf_sec_hnd->size / sizeof( Elf32_Sym );
    elf_sec_hnd->assoc.sym.symbols = (elf_symbol_handle) _ClientSecAlloc( elf_sec_hnd, sizeof( elf_symbol_handle_struct ) * num_syms );
    if( !(elf_sec_hnd->assoc.sym.symbols) )
        return( ORL_OUT_OF_MEMORY );
    current = elf_sec_hnd->assoc.sym.symbols;
    current_sym = (Elf32_Sym *) elf_sec_hnd->contents;
    for( loop = 0; loop < num_syms; loop++ ) {
        fix_sym_byte_order( elf_sec_hnd->elf_file_hnd, current_sym );
        if( current_sym->st_name == 0 ) {
            current->name = NULL;
        } else {
            current->name = &(elf_sec_hnd->assoc.sym.string_table->contents[current_sym->st_name]);
        }
        current->file_format = ORL_ELF;
        current->elf_file_hnd = elf_sec_hnd->elf_file_hnd;
        current->symbol = current_sym;
        switch( ELF32_ST_BIND( current->symbol->st_info ) ) {
        case STB_LOCAL:
            current->binding = ORL_SYM_BINDING_LOCAL;
            break;
        case STB_GLOBAL:
            current->binding = ORL_SYM_BINDING_GLOBAL;
            break;
        case STB_WEAK:
            current->binding = ORL_SYM_BINDING_WEAK;
            break;
        default:
            current->binding = ORL_SYM_BINDING_NONE; // other?
            break;
        }
        switch( ELF32_ST_TYPE( current->symbol->st_info ) ) {
        case STT_OBJECT:
            current->type = ORL_SYM_TYPE_OBJECT;
            break;
        case STT_FUNC:
            current->type = ORL_SYM_TYPE_FUNCTION;
            break;
        case STT_SECTION:
            current->type = ORL_SYM_TYPE_SECTION;
            break;
        case STT_FILE:
            current->type = ORL_SYM_TYPE_FILE;
            break;
        default:
            current->type = ORL_SYM_TYPE_NOTYPE;
            break;
        }
        switch( current->symbol->st_shndx ) {
        case SHN_ABS:
            current->type |= ORL_SYM_TYPE_ABSOLUTE;
            break;
        case SHN_COMMON:
            current->type |= ORL_SYM_TYPE_COMMON;
            break;
        case SHN_UNDEF:
            current->type |= ORL_SYM_TYPE_UNDEFINED;
            break;
        }
        current++;
        current_sym++;
    }
    return( ORL_OKAY );
}


orl_return ElfBuildSecNameHashTable( elf_file_handle elf_file_hnd )
{
    int             loop;
    orl_return      error;

    elf_file_hnd->sec_name_hash_table = ORLHashTableCreate( elf_file_hnd->elf_hnd->funcs, SEC_NAME_HASH_TABLE_SIZE, ORL_HASH_STRING, (orl_hash_comparison_func) stricmp );
    if( !(elf_file_hnd->sec_name_hash_table) ) {
        return( ORL_OUT_OF_MEMORY );
    }
    for( loop = 0; loop < elf_file_hnd->num_sections; loop++ ) {
        error = ORLHashTableInsert( elf_file_hnd->sec_name_hash_table, (orl_hash_value) elf_file_hnd->elf_sec_hnd[loop]->name, elf_file_hnd->elf_sec_hnd[loop] );
        if( error != ORL_OKAY )
            return( error );
    }
    return( ORL_OKAY );
}


static orl_reloc_type convertPPCReloc( elf_reloc_type elf_type )
{
    switch( elf_type ) {
    case R_PPC_NONE:
        return( ORL_RELOC_TYPE_ABSOLUTE );
    case R_PPC_ADDR32:
        return( ORL_RELOC_TYPE_WORD_32 );
    case R_PPC_ADDR24:
        return( ORL_RELOC_TYPE_WORD_24 );
    case R_PPC_ADDR16:
        return( ORL_RELOC_TYPE_WORD_16 );
    case R_PPC_ADDR16_LO:
        return( ORL_RELOC_TYPE_HALF_LO );
    case R_PPC_ADDR16_HI:
        return( ORL_RELOC_TYPE_HALF_HI );
    case R_PPC_ADDR16_HA:
        return( ORL_RELOC_TYPE_HALF_HA );
    case R_PPC_ADDR14:
        return( ORL_RELOC_TYPE_WORD_14 );
    case R_PPC_ADDR14_BRTAKEN:
    case R_PPC_ADDR14_BRNTAKEN:
        // fixme
        return( ORL_RELOC_TYPE_WORD_14 );
    case R_PPC_REL24:
        return( ORL_RELOC_TYPE_REL_24 );
    case R_PPC_REL14:
        return( ORL_RELOC_TYPE_REL_14 );
    case R_PPC_REL14_BRTAKEN:
    case R_PPC_REL14_BRNTAKEN:
        // fixme
        return( ORL_RELOC_TYPE_REL_14 );
    case R_PPC_GOT16:
        return( ORL_RELOC_TYPE_GOT_16 );
    case R_PPC_GOT16_LO:
        return( ORL_RELOC_TYPE_GOT_16_LO );
    case R_PPC_GOT16_HI:
        return( ORL_RELOC_TYPE_GOT_16_HI );
    case R_PPC_GOT16_HA:
        return( ORL_RELOC_TYPE_GOT_16_HA );
    case R_PPC_PLTREL24:
        return( ORL_RELOC_TYPE_PLTREL_24 );
    case R_PPC_COPY:
        return( ORL_RELOC_TYPE_NONE );
    case R_PPC_GLOB_DAT:
        return( ORL_RELOC_TYPE_WORD_32 );
    case R_PPC_JMP_SLOT:
        // fixme
        return( ORL_RELOC_TYPE_NONE );
    case R_PPC_RELATIVE:
        return( ORL_RELOC_TYPE_SEC_REL );
    case R_PPC_LOCAL24PC:
        // fixme
        return( ORL_RELOC_TYPE_REL_24 );
    case R_PPC_UADDR32:
        return( ORL_RELOC_TYPE_WORD_32 );
    case R_PPC_UADDR16:
        return( ORL_RELOC_TYPE_WORD_16 );
    case R_PPC_REL32:
        return( ORL_RELOC_TYPE_REL_32 );
    case R_PPC_PLT32:
        return( ORL_RELOC_TYPE_PLT_32 );
    case R_PPC_PLTREL32:
        return( ORL_RELOC_TYPE_PLTREL_32 );
    case R_PPC_PLT16_LO:
        return( ORL_RELOC_TYPE_PLT_16_LO );
    case R_PPC_PLT16_HI: return( ORL_RELOC_TYPE_PLT_16_HI );
    case R_PPC_PLT16_HA: return( ORL_RELOC_TYPE_PLT_16_HA );
    }
    return( ORL_RELOC_TYPE_NONE );