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layer.c リンカ・ローダ実践開発テクニック坂井弘亮(15) coding(129)

Last updated at 2024-07-28Posted at 2024-07-14

リンカ・ローダ

各社のリンカ、ローダ、libralian、locator、boot loaderなどの機能を調べる上で、
「リンカ・ローダ実践開発テクニック」坂井弘亮
は、手がかりをつかめるかもしれない。

リンカ・ローダ実践開発テクニック―実行ファイルを作成するために必須の技術-COMPUTER-TECHNOLOGY-坂井-弘亮
https://www.amazon.co.jp//dp/4789838072/
https://bookmeter.com/books/630946

参考文献にあるLinkers & Loadersは斜め読みしただけで、自分ではこういう道具は作らないだろうと勝手に思っていた。本書では簡易リンカの作成と、道具の作り方まで有るのがすごい。「setjmp()とlongjmp()」というコラムが１頁に入りきらず４頁になっているのに、節にしていないところも興味深い。

<この項は書きかけです。順次追記します。>
This article is not completed. I will add some words in order.

content

content
https://shop.cqpub.co.jp/hanbai/books/38/38071.html

ardump.c リンカ・ローダ実践開発テクニック坂井弘亮(1) coding(89)
https://qiita.com/kaizen_nagoya/items/2a7bf3050ee6ac662272

binary.c リンカ・ローダ実践開発テクニック坂井弘亮(2) coding(90)
https://qiita.com/kaizen_nagoya/items/23b985cefc5338677812

combine.c リンカ・ローダ実践開発テクニック坂井弘亮(3) coding(91)
https://qiita.com/kaizen_nagoya/items/59161e3274270cfd2009

const.c, リンカ・ローダ実践開発テクニック坂井弘亮(4) coding(92) error(123) docker(174)
https://qiita.com/kaizen_nagoya/items/6f74dbf637a91685d0d1

constructor.c リンカ・ローダ実践開発テクニック坂井弘亮(5) coding(93)
https://qiita.com/kaizen_nagoya/items/37e14a0943907b6f836f

continue.c リンカ・ローダ実践開発テクニック坂井弘亮(6) coding(95)
https://qiita.com/kaizen_nagoya/items/e124223fd49db6d9e7a2

down.c リンカ・ローダ実践開発テクニック坂井弘亮(7) coding(96)
https://qiita.com/kaizen_nagoya/items/866449f129cc8ce4dee7

ctors.c リンカ・ローダ実践開発テクニック坂井弘亮(8) coding(97)
https://qiita.com/kaizen_nagoya/items/135524de5f8fea10e90f

duplicate.c リンカ・ローダ実践開発テクニック坂井弘亮(9) coding(123)
https://qiita.com/kaizen_nagoya/items/2339c517f223e556bf67

edata.c リンカ・ローダ実践開発テクニック坂井弘亮(10) coding(124)
https://qiita.com/kaizen_nagoya/items/bbfe0d6a3c5375026c64

elfread.c リンカ・ローダ実践開発テクニック坂井弘亮(11) coding(125)
https://qiita.com/kaizen_nagoya/items/600c4a1133dc08da215e

edata.c リンカ・ローダ実践開発テクニック坂井弘亮(12) coding(126)
https://qiita.com/kaizen_nagoya/items/b6eff6b348d7cf5f257c

hello.c リンカ・ローダ実践開発テクニック坂井弘亮(13) coding(127)
https://qiita.com/kaizen_nagoya/items/4af05d017d73ebe789d5

inicialize.c リンカ・ローダ実践開発テクニック坂井弘亮(14) coding(128)
https://qiita.com/kaizen_nagoya/items/4feeb9ef85bfc28fd821

layer.c リンカ・ローダ実践開発テクニック坂井弘亮(15) coding(129)
https://qiita.com/kaizen_nagoya/items/90bb95f9e538e66d2dbf

ordermain.c リンカ・ローダ実践開発テクニック坂井弘亮(16) coding(130)
https://qiita.com/kaizen_nagoya/items/446a6768a0abdd13c8b5

N3220 Information technology — Programming languages — C N3220 working draft
https://www.open-std.org/JTC1/SC22/WG14/www/docs/n3220.pdf
N3219 Information technology — Programming languages — C ISO/IEC 9899:2023 DIS Draft
https://www.open-std.org/jtc1/sc22/wg14/www/docs/n3219.pdf

layer.c

extern int num;
void printnum();
void func1();
void func2();

int main()
{
  printnum();
  num++;   printnum();
  func1(); printnum();
  func2(); printnum();
  exit (0);
}

次のファイルではstdio.hをincludeしている。

layer2.c

#include <stdio.h>

/* extern int num; */ /* num は localized なので */
void printnum();
void func1();
void func2();

int main()
{
  printnum();
  /* num++;   printnum(); */ /* num は localized なので */
  func1(); printnum();
  func2(); printnum();
  exit (0);
}

layer_sub1.c

#include <stdio.h>

int num = 0;

void printnum()
{
  printf("num = %d\n", num);
}

void func1()
{
  num++;
}

layer_sub2.c

extern int num;

void func2()
{
  num++;
}

Makefileが長い。

Makefile

OBJS=	layer_sub1.o layer_sub2.o liblayer.a liblayer_local.a \
	layer_lib.o layer_lib_local.o layer.o layer2.o \
	layer alayer alayer_local alayer2_local \
	olayer olayer_local olayer2_local \
	layer.exec alayer.exec alayer_local.exec alayer2_local.exec \
	olayer.exec olayer_local.exec olayer2_local.exec \
	liblayer.a.nm liblayer_local.a.nm layer_lib.o.nm layer_lib_local.o.nm \
	layer_lib2.o.comp

all :	$(OBJS)

layer_sub1.o :	layer_sub1.c
	echo "% gcc -c layer_sub1.c -Wall" > layer_sub1.o.comp
	gcc -c layer_sub1.c -Wall >> layer_sub1.o.comp 2>&1
#	echo "% " >> layer_sub1.o.comp

layer_sub2.o :	layer_sub2.c
	echo "% gcc -c layer_sub2.c -Wall" > layer_sub2.o.comp
	gcc -c layer_sub2.c -Wall >> layer_sub2.o.comp 2>&1
#	echo "% " >> layer_sub2.o.comp

liblayer.a :	layer_sub1.o layer_sub2.o
	echo "% ar ruc liblayer.a layer_sub1.o layer_sub2.o" \
		> liblayer.a.comp
	ar ruc liblayer.a layer_sub1.o layer_sub2.o >> liblayer.a.comp 2>&1
	echo "% " >> liblayer.a.comp

liblayer_local.a :	liblayer.a
	echo "% objcopy --localize-symbol=num liblayer.a liblayer_local.a" \
		> liblayer_local.a.comp
	objcopy --localize-symbol=num liblayer.a liblayer_local.a \
		>> liblayer_local.a.comp 2>&1
	echo "% " >> liblayer_local.a.comp

layer_lib.o :	layer_sub1.o layer_sub2.o
	echo "% ld -r layer_sub1.o layer_sub2.o -o layer_lib.o" \
		> layer_lib.o.comp
	ld -r layer_sub1.o layer_sub2.o -o layer_lib.o >> layer_lib.o.comp 2>&1
	echo "% " >> layer_lib.o.comp

layer_lib_local.o :	layer_lib.o
	echo "% objcopy --localize-symbol=num layer_lib.o layer_lib_local.o" \
		> layer_lib_local.o.comp
	objcopy --localize-symbol=num layer_lib.o layer_lib_local.o \
		>> layer_lib_local.o.comp 2>&1
	echo "% " >> layer_lib_local.o.comp

layer_lib2.o.comp :	layer_sub1.c
	echo "% cp layer_sub1.c layer_sub3.c" > layer_lib2.o.comp
	cp layer_sub1.c layer_sub3.c >> layer_lib2.o.comp
	echo "% gcc -c layer_sub3.c" >> layer_lib2.o.comp
	gcc -c layer_sub3.c >> layer_lib2.o.comp
	echo "% ld -r layer_sub1.o layer_sub3.o -o layer_lib2.o" \
		>> layer_lib2.o.comp
	(ld -r layer_sub1.o layer_sub3.o -o layer_lib2.o 2>&1 | cat) \
		>> layer_lib2.o.comp &
	sleep 1
	echo "% " >> layer_lib2.o.comp

layer.o :	layer.c
	echo "% gcc -c layer.c -Wall" > layer.o.comp
	gcc -c layer.c -Wall >> layer.o.comp 2>&1
#	echo "% " >> layer.o.comp

layer2.o :	layer2.c
	echo "% gcc -c layer2.c -Wall" > layer2.o.comp
	gcc -c layer2.c -Wall >> layer2.o.comp 2>&1
#	echo "% " >> layer2.o.comp

layer :	layer.o layer_sub1.o layer_sub2.o
	echo "% gcc layer.o layer_sub1.o layer_sub2.o -o layer" > layer.comp
	gcc layer.o layer_sub1.o layer_sub2.o -o layer >> layer.comp 2>&1
	echo "% " >> layer.comp

alayer :	layer.o liblayer.a
	echo "% gcc layer.o -o alayer -L. -llayer" > alayer.comp
	gcc layer.o -o alayer -L. -llayer >> alayer.comp 2>&1
	echo "% " >> alayer.comp

alayer_local :	layer.o liblayer_local.a
	echo "% gcc layer.o -o alayer_local -L. -llayer_local" \
		> alayer_local.comp
	(gcc layer.o -o alayer_local -L. -llayer_local 2>&1 | cat) \
		>> alayer_local.comp &
	sleep 1
	echo "% " >> alayer_local.comp

alayer2_local :	layer2.o liblayer_local.a
	echo "% gcc layer2.o -o alayer2_local -L. -llayer_local" \
		> alayer2_local.comp
	(gcc layer2.o -o alayer2_local -L. -llayer_local 2>&1 | cat) \
		>> alayer2_local.comp &
	sleep 1
	echo "% " >> alayer2_local.comp

olayer :	layer.o layer_lib.o
	echo "% gcc layer.o layer_lib.o -o olayer" > olayer.comp
	gcc layer.o layer_lib.o -o olayer >> olayer.comp 2>&1
	echo "% " >> olayer.comp

olayer_local :	layer.o layer_lib_local.o
	echo "% gcc layer.o layer_lib_local.o -o olayer_local" \
		> olayer_local.comp
	(gcc layer.o layer_lib_local.o -o olayer_local 2>&1 | cat) \
		>> olayer_local.comp &
	sleep 1
	echo "% " >> olayer_local.comp

olayer2_local :	layer2.o layer_lib_local.o
	echo "% gcc layer2.o layer_lib_local.o -o olayer2_local" \
		> olayer2_local.comp
	gcc layer2.o layer_lib_local.o -o olayer2_local >> olayer2_local.comp &
#	echo "% " >> olayer2_local.comp

layer.exec :	layer
	echo "% ./layer" > layer.exec
	(./layer 2>&1 | cat) >> layer.exec &
	sleep 1
	echo "% " >> layer.exec
	rm -f layer.core

alayer.exec :	alayer
	echo "% ./alayer" > alayer.exec
	(./alayer 2>&1 | cat) >> alayer.exec &
	sleep 1
	echo "% " >> alayer.exec
	rm -f alayer.core

alayer_local.exec :	alayer_local
	echo "% ./alayer_local" > alayer_local.exec
	(./alayer_local 2>&1 | cat) >> alayer_local.exec &
	sleep 1
	echo "% " >> alayer_local.exec
	rm -f alayer_local.core

alayer2_local.exec :	alayer2_local
	echo "% ./alayer2_local" > alayer2_local.exec
	(./alayer2_local 2>&1 | cat) >> alayer2_local.exec &
	sleep 1
	echo "% " >> alayer2_local.exec
	rm -f alayer2_local.core

olayer.exec :	olayer
	echo "% ./olayer" > olayer.exec
	(./olayer 2>&1 | cat) >> olayer.exec &
	sleep 1
	echo "% " >> olayer.exec
	rm -f olayer.core

olayer_local.exec :	olayer_local
	echo "% ./olayer_local" > olayer_local.exec
	(./olayer_local 2>&1 | cat) >> olayer_local.exec &
	sleep 1
	echo "% " >> olayer_local.exec
	rm -f olayer_local.core

olayer2_local.exec :	olayer2_local
	echo "% ./olayer2_local" > olayer2_local.exec
	(./olayer2_local 2>&1 | cat) >> olayer2_local.exec &
	sleep 1
	echo "% " >> olayer2_local.exec
	rm -f olayer2_local.core

liblayer.a.nm :	liblayer.a
	echo "% nm liblayer.a" > liblayer.a.nm
	nm liblayer.a >> liblayer.a.nm
	echo "% " >> liblayer.a.nm

liblayer_local.a.nm :	liblayer_local.a
	echo "% nm liblayer_local.a" > liblayer_local.a.nm
	nm liblayer_local.a >> liblayer_local.a.nm
	echo "% " >> liblayer_local.a.nm

layer_lib.o.nm :	layer_lib.o
	echo "% nm layer_lib.o" > layer_lib.o.nm
	nm layer_lib.o >> layer_lib.o.nm
	echo "% " >> layer_lib.o.nm

layer_lib_local.o.nm :	layer_lib_local.o
	echo "% nm layer_lib_local.o" > layer_lib_local.o.nm
	nm layer_lib_local.o >> layer_lib_local.o.nm
	echo "% " >> layer_lib_local.o.nm

clean :
	rm -f $(OBJS) *.comp

2つのソースから、ソースの違いと動作の違いを説明しようとしている。

関連資料

' @kazuo_reve 私が効果を確認した「小川メソッド」
https://qiita.com/kazuo_reve/items/a3ea1d9171deeccc04da
' @kazuo_reve 新人の方によく展開している有益な情報
https://qiita.com/kazuo_reve/items/d1a3f0ee48e24bba38f1
' @kazuo_reve Vモデルについて勘違いしていたと思ったこと
https://qiita.com/kazuo_reve/items/46fddb094563bd9b2e1e

自己記事一覧

＜この記事は個人の過去の経験に基づく個人の感想です。現在所属する組織、業務とは関係がありません。＞
This article is an individual impression based on my individual experience. It has nothing to do with the organization or business to which I currently belong.

文書履歴(document history)

ver. 0.01 初稿　20240714

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layer.c リンカ・ローダ実践開発テクニック 坂井弘亮(15) coding(129)