libgreet/main: updated comments

2 files changed, 10 insertions, 5 deletions

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");
 }
diff --git a/04_dynld_nostd/main.c b/04_dynld_nostd/main.c
index 709fad0..6efa5fc 100644
--- a/04_dynld_nostd/main.c
+++ b/04_dynld_nostd/main.c
@@ -1,7 +1,6 @@
 // Copyright (c) 2020 Johannes Stoelp
 
 #include <io.h>
-#include <syscalls.h>
 
 // API of `libgreet.so`.
 extern const char* get_greet();
@@ -11,10 +10,10 @@ extern int gCalled;
 void _start() {
     pfmt("Running _start() @ %s\n", __FILE__);
 
-    // Call function from libgreet.so -> generates PLT relocations.
+    // Call function from libgreet.so -> generates PLT relocations (R_X86_64_JUMP_SLOT).
     pfmt("get_greet()  -> %s\n", get_greet());
     pfmt("get_greet2() -> %s\n", get_greet2());
 
-    // Reference global variable from libgreet.so -> generates RELA relocation.
+    // Reference global variable from libgreet.so -> generates RELA relocation (R_X86_64_COPY).
     pfmt("libgreet.so called %d times\n", gCalled);
 }