elflwlv.c

开放源码的编译器open watcom 1.6.0版的源代码

}


static orl_reloc_type convert386Reloc( elf_reloc_type elf_type )
{
    switch( elf_type ) {
    case R_386_NONE:
    case R_386_COPY:
        return( ORL_RELOC_TYPE_ABSOLUTE );
    case R_386_GOT32:
        return( ORL_RELOC_TYPE_GOT_32 );
    case R_386_PLT32:
        return( ORL_RELOC_TYPE_PLT_32 );
    case R_386_JMP_SLOT:
        return( ORL_RELOC_TYPE_PLTREL_32 );
    case R_386_32:
    case R_386_GOTOFF:
        return( ORL_RELOC_TYPE_WORD_32 );
    case R_386_PC32:
    case R_386_GOTPC:
        return( ORL_RELOC_TYPE_REL_32_NOADJ );
    default:
        assert( 0 );
    }
    return( ORL_RELOC_TYPE_NONE );
}


static orl_reloc_type convertMIPSReloc( elf_reloc_type elf_type )
{
    switch( elf_type ) {
    case R_MIPS_NONE:
        return( ORL_RELOC_TYPE_ABSOLUTE );
    case R_MIPS_16:
        return( ORL_RELOC_TYPE_WORD_16 );
    case R_MIPS_32:
        return( ORL_RELOC_TYPE_WORD_32 );
    case R_MIPS_REL32:
        return( ORL_RELOC_TYPE_REL_32 );
    case R_MIPS_HI16:
        return( ORL_RELOC_TYPE_HALF_HI );
    case R_MIPS_LO16:
        return( ORL_RELOC_TYPE_HALF_LO );
    case R_MIPS_GOT16:
        return( ORL_RELOC_TYPE_GOT_16 );
    case R_MIPS_CALL16:
        return( ORL_RELOC_TYPE_GOT_16 );
    case R_MIPS_26:
        return( ORL_RELOC_TYPE_WORD_26 );
    case R_MIPS_PC16:
        return( ORL_RELOC_TYPE_REL_16 );
    default:
        assert( 0 );
    }
    return( ORL_RELOC_TYPE_NONE );
}


orl_reloc_type ElfConvertRelocType( elf_file_handle elf_file_hnd, elf_reloc_type elf_type )
{
    switch( elf_file_hnd->machine_type ) {
    case ORL_MACHINE_TYPE_PPC601:
        return( convertPPCReloc( elf_type ) );
    case ORL_MACHINE_TYPE_I386:
        return( convert386Reloc( elf_type ) );
    case ORL_MACHINE_TYPE_R3000:
    case ORL_MACHINE_TYPE_R4000:
        return( convertMIPSReloc( elf_type ) );
    default:
        assert( 0 );
    }
    return( ORL_RELOC_TYPE_NONE );
}


orl_return ElfCreateRelocs( elf_sec_handle orig_sec, elf_sec_handle reloc_sec )
{
    orl_return          return_val;
    int                 num_relocs;
    int                 loop;
    Elf32_Rel           *rel;
    Elf32_Rela          *rela;
    orl_reloc           *o_rel;

    if( reloc_sec->assoc.reloc.symbol_table->assoc.sym.symbols == NULL ) {
        return_val = ElfCreateSymbolHandles( reloc_sec->assoc.reloc.symbol_table );
        if( return_val != ORL_OKAY )
            return( return_val );
    }
    switch( reloc_sec->type ) {
    case ORL_SEC_TYPE_RELOCS:
        num_relocs = reloc_sec->size / sizeof( Elf32_Rel );
        reloc_sec->assoc.reloc.relocs = (orl_reloc *) _ClientSecAlloc( reloc_sec, sizeof( orl_reloc ) * num_relocs );
        if( reloc_sec->assoc.reloc.relocs == NULL )
            return( ORL_OUT_OF_MEMORY );
        rel = (Elf32_Rel *) reloc_sec->contents;
        o_rel = (orl_reloc *) reloc_sec->assoc.reloc.relocs;
        for( loop = 0; loop < num_relocs; loop++ ) {
            fix_rel_byte_order( reloc_sec->elf_file_hnd, rel );
            o_rel->section = (orl_sec_handle) orig_sec;
            o_rel->symbol = (orl_symbol_handle) &(reloc_sec->assoc.reloc.symbol_table->assoc.sym.symbols[ELF32_R_SYM( rel->r_info )]);
            o_rel->type = ElfConvertRelocType( reloc_sec->elf_file_hnd, ELF32_R_TYPE( rel->r_info ) );
            o_rel->offset = rel->r_offset;
            o_rel->addend = 0;
            o_rel->frame = NULL;
            rel++;
            o_rel++;
        }
        break;
    case ORL_SEC_TYPE_RELOCS_EXPADD:
        num_relocs = reloc_sec->size / sizeof( Elf32_Rela );
        reloc_sec->assoc.reloc.relocs = (orl_reloc *) _ClientSecAlloc( reloc_sec, sizeof( orl_reloc ) * num_relocs );
        if( reloc_sec->assoc.reloc.relocs == NULL )
            return( ORL_OUT_OF_MEMORY );
        rela = (Elf32_Rela *) reloc_sec->contents;
        o_rel = (orl_reloc *) reloc_sec->assoc.reloc.relocs;
        for( loop = 0; loop < num_relocs; loop++ ) {
            fix_rela_byte_order( reloc_sec->elf_file_hnd, rela );
            o_rel->section = (orl_sec_handle) orig_sec;
            o_rel->symbol = (orl_symbol_handle) &(reloc_sec->assoc.reloc.symbol_table->assoc.sym.symbols[ELF32_R_SYM( rela->r_info )]);
            o_rel->type = ElfConvertRelocType( reloc_sec->elf_file_hnd, ELF32_R_TYPE( rela->r_info ) );
            o_rel->offset = rela->r_offset;
            o_rel->addend = rela->r_addend;
            o_rel->frame = NULL;
            rela++;
            o_rel++;
        }
        break;
    default:
        break;
    }
    return( ORL_OKAY );
}

static size_t strncspn( char *s, char *charset, int len)
{
    char            chartable[32];
    int             i;
    unsigned char   ch;

    memset( chartable, 0, sizeof( chartable ) );
    for( ; *charset != 0; charset++ ) {
        ch = *charset;
        chartable[ch / 8] |= 1 << ch % 8;
    }
    for (i = 0; i < len; i++) {
        ch = s[i];
        if( chartable[ch/8] & (1 << ch % 8) ) {
            break;
        }
    }
    return( i );
}

static char *pstrncspn( char *s, char *charset, int *len )
{
    int     l = strncspn( s, charset, *len );

    *len -= l;
    return( s + l );
}

static void EatWhite( char **contents, int *len )
/***********************************************/
{
    char    ch = **contents;

    while( (ch == ' ' || ch == '\t' || ch == '=' || ch == ',') && *len > 0 ) {
        (*len)--;
        *contents += 1;
        ch = **contents;
    }
}

static orl_return ParseExport( char **contents, int *len,
                               orl_note_callbacks *cb, void *cookie )
/********************************************************************/
{
    char        *arg;
    int         l;

    l = strncspn( *contents, ", \t", *len );
    arg = alloca( l + 1 );
    memcpy(arg, *contents, l);
    arg[l] = 0;
    *len -= l;
    *contents += l;
    return( cb->export_fn( arg, cookie ) );
}


static orl_return ParseDefLibEntry( char **contents, int *len,
    orl_return  (*deflibentry_fn)( char *, void * ), void *cookie )
/*****************************************************************/
{
    char        *arg;
    int         l;
    orl_return  retval;

    for( ;; ) {
        l = strncspn( *contents, ", \t", *len );
        arg = alloca( l + 1 );
        memcpy(arg, *contents, l);
        arg[l] = 0;
        *len -= l;
        *contents += l;

        retval = deflibentry_fn( arg, cookie );
        if( retval != ORL_OKAY || **contents != ',' )
            break;
        (*contents)++;
    }
    return( retval );
}

orl_return ElfParseDrectve( char *contents, int len, orl_note_callbacks *cb,
                            void *cookie)
/**************************************************************************/
{
    char        *cmd;

    EatWhite( &contents, &len );
    while( len > 0 ) {
        if( *contents != '-' )
            break;              // - should be start of token
        contents++; len--;
        cmd = contents;
        contents = pstrncspn( contents, ":", &len);
        if( contents == NULL )
            break;
        contents++; len--;
        if( memicmp( cmd, "export", 6 ) == 0 ) {
            if( ParseExport( &contents, &len, cb, cookie ) != ORL_OKAY )
                break;
        } else if( memicmp( cmd, "defaultlib", 10 ) == 0 ) {
            if( ParseDefLibEntry( &contents, &len, cb->deflib_fn, cookie )
                != ORL_OKAY ) break;
        } else if( memicmp( cmd, "entry", 5 ) == 0 ) {
            if( ParseDefLibEntry( &contents, &len, cb->entry_fn, cookie )
                != ORL_OKAY ) break;
        }
        EatWhite( &contents, &len );
    }
    return( ORL_OKAY );
}