From 287f736e614a2931f57e9aabf42105e3cf3e8992 Mon Sep 17 00:00:00 2001
From: johannst <johannes.stoelp@gmail.com>
Date: Sat, 17 Apr 2021 23:47:17 +0200
Subject: 04: able to map dependency & resolve reolcs and execture main program
 (initial commit)

---
 04_dynld_nostd/libgreet.c | 9 +++++++++
 1 file changed, 9 insertions(+)
 create mode 100644 04_dynld_nostd/libgreet.c

(limited to '04_dynld_nostd/libgreet.c')

diff --git a/04_dynld_nostd/libgreet.c b/04_dynld_nostd/libgreet.c
new file mode 100644
index 0000000..f2a96a3
--- /dev/null
+++ b/04_dynld_nostd/libgreet.c
@@ -0,0 +1,9 @@
+// Copyright (c) 2020 Johannes Stoelp
+
+const char* get_greet() {
+    return "Hello from libgreet.so!";
+}
+
+const char* get_greet2() {
+    return "Hello 2 from libgreet.so!";
+}
-- 
cgit v1.2.3


From 85230524414b6d27664bf77c8584bfeced6c71cb Mon Sep 17 00:00:00 2001
From: johannst <johannes.stoelp@gmail.com>
Date: Wed, 21 Apr 2021 23:41:59 +0200
Subject: add support to resolve all relocations in PLT & RELA tables; add
 global variable as example to libgreet.so

---
 04_dynld_nostd/libgreet.c | 4 ++++
 1 file changed, 4 insertions(+)

(limited to '04_dynld_nostd/libgreet.c')

diff --git a/04_dynld_nostd/libgreet.c b/04_dynld_nostd/libgreet.c
index f2a96a3..439e236 100644
--- a/04_dynld_nostd/libgreet.c
+++ b/04_dynld_nostd/libgreet.c
@@ -1,9 +1,13 @@
 // Copyright (c) 2020 Johannes Stoelp
 
+int gCalled = 0;
+
 const char* get_greet() {
+    ++gCalled;
     return "Hello from libgreet.so!";
 }
 
 const char* get_greet2() {
+    ++gCalled;
     return "Hello 2 from libgreet.so!";
 }
-- 
cgit v1.2.3


From 05f740db6fe966d32256d4ed3b897f7b3e051fff Mon Sep 17 00:00:00 2001
From: johannst <johannes.stoelp@gmail.com>
Date: Sun, 25 Apr 2021 23:38:36 +0200
Subject: added support for R_X86_64_64/R_X86_64_RELATIVE relocations + added
 init/fini

---
 04_dynld_nostd/libgreet.c | 10 ++++++++++
 1 file changed, 10 insertions(+)

(limited to '04_dynld_nostd/libgreet.c')

diff --git a/04_dynld_nostd/libgreet.c b/04_dynld_nostd/libgreet.c
index 439e236..e697690 100644
--- a/04_dynld_nostd/libgreet.c
+++ b/04_dynld_nostd/libgreet.c
@@ -1,5 +1,7 @@
 // Copyright (c) 2020 Johannes Stoelp
 
+#include <io.h>
+
 int gCalled = 0;
 
 const char* get_greet() {
@@ -11,3 +13,11 @@ const char* get_greet2() {
     ++gCalled;
     return "Hello 2 from libgreet.so!";
 }
+
+__attribute__((constructor)) static void libinit() { /* static -> generates R_X86_64_RELATIVE relocation */
+    pfmt("libgreet.so: libinit\n");
+}
+
+__attribute__((destructor)) void libfini() { /* non static -> generates R_X86_64_64 relocation */
+    pfmt("libgreet.so: libfini\n");
+}
-- 
cgit v1.2.3


From 7da4d2b9cfa1d09991431f849d62a8a8d30f5e51 Mon Sep 17 00:00:00 2001
From: johannst <johannes.stoelp@gmail.com>
Date: Mon, 26 Apr 2021 21:48:01 +0200
Subject: libgreet/main: updated comments

---
 04_dynld_nostd/libgreet.c | 10 ++++++++--
 1 file changed, 8 insertions(+), 2 deletions(-)

(limited to '04_dynld_nostd/libgreet.c')

diff --git a/04_dynld_nostd/libgreet.c b/04_dynld_nostd/libgreet.c
index e697690..f90bdbf 100644
--- a/04_dynld_nostd/libgreet.c
+++ b/04_dynld_nostd/libgreet.c
@@ -5,19 +5,25 @@
 int gCalled = 0;
 
 const char* get_greet() {
+    // Reference global variable -> generates RELA relocation (R_X86_64_GLOB_DAT).
     ++gCalled;
     return "Hello from libgreet.so!";
 }
 
 const char* get_greet2() {
+    // Reference global variable -> generates RELA relocation (R_X86_64_GLOB_DAT).
     ++gCalled;
     return "Hello 2 from libgreet.so!";
 }
 
-__attribute__((constructor)) static void libinit() { /* static -> generates R_X86_64_RELATIVE relocation */
+// Definition of `static` function which is referenced from the `INIT` dynamic
+// section entry -> generates R_X86_64_RELATIVE relocation.
+__attribute__((constructor)) static void libinit() {
     pfmt("libgreet.so: libinit\n");
 }
 
-__attribute__((destructor)) void libfini() { /* non static -> generates R_X86_64_64 relocation */
+// Definition of `non static` function which is referenced from the `FINI`
+// dynamic section entry -> generates R_X86_64_64 relocation.
+__attribute__((destructor)) void libfini() {
     pfmt("libgreet.so: libfini\n");
 }
-- 
cgit v1.2.3