アセンブラーのような nasm を開発しています。現在、COFF 形式のファイルを生成するプロセスをコーディングしています。
私の問題は非常に具体的で、valueonという名前のフィールドに苦しんでいますCOFF Symbol Table。計算方法や指定方法がわかりませんでした。
ドキュメントMicrosoft Portable Executable and Common Object File Format Specificationを読みました。私が参照した記事に従ってください：
The Symbol Table described in this section is inherited from the traditional COFF format.
It is distinct from CodeView® information. A file may contain both a COFF Symbol
Table and CodeView debug information, and the two are kept separate. Some Microsoft
tools use the Symbol Table for limited but important purposes, such as communicating
COMDAT information to the linker. Section names and file names, as well as code and
data symbols, are listed in the Symbol Table.
The location of the Symbol Table is indicated in the COFF Header.
The Symbol Table is an array of records, each 18 bytes long. Each record is either a
standard or auxiliary symbol-table record. A standard record defines a symbol or name,
and has the following format:
|--------| -----|---------------|-------------------------------------------------------------------|
| Offset | Size | Field | Description |
|--------| -----|---------------|-------------------------------------------------------------------|
| 0 | 8 | Name (*) | Name of the symbol, represented by union of three structures. |
| | | | An array of eight bytes is used if the name is not more than |
| | | | eight bytes long. See Section 5.4.1, |
| | | | "Symbol Name Representation, " for more information. |
----------------------------------------------------------------------------------------------------|
| 8 | 4 | Value | Value associated with the symbol. |
| | | | The interpretation of this field depends on Section Number |
| | | | and Storage Class. A typical meaning is the relocatable address. |
----------------------------------------------------------------------------------------------------|
| 12 | 2 | SectionNumber | Signed integer identifying the section, using a one-based index |
| | | | into the Section Table. Some values have special meaning defined |
| | | | in "Section Number Values." |
----------------------------------------------------------------------------------------------------|
| 14 | 2 | Type | representing type. Microsoft tools set this field to 0x20 |
| | | | (function) or 0x0 (not a function). See Section 5.4.3, |
| | | | "Type Representation," for more information. |
----------------------------------------------------------------------------------------------------|
| 16 | 1 | StorageClass | Enumerated value representing storage class. |
| | | | See Section 5.4.4, "Storage Class," for more information. |
| | | | |
----------------------------------------------------------------------------------------------------|
| 17 | 1 | NumberOfAux | Number of auxiliary symbol table entries that follow this record. |
| | | Symbols | |
----------------------------------------------------------------------------------------------------|
Value基本的な C 関数のシンボルを定義するためのフィールドの指定方法を教えてください。_test
// define basic C function, I think it will be the symbol like "_test" in COFF files.
void test(int value) { return;}
このドキュメントでは、Valueフィールドは を表しrelocatable addressます。それを知る方法は？