Linker script refactor

In general this update touching sections for initialization and destruction of
    global variables.

DISCARD sections added (.fini and .comment) and particular sections
(.ctors, .dtors, .init, .fini) moved into more common sections (.rodata
and .text) accordingly. This decision allows to save a some RAM.

Signed-off-by: Alexey Gavrilov <alexey.gavrilov@mail.com>

1 files changed, 18 insertions, 10 deletions

diff --git a/kernel/linker.ld b/kernel/linker.ld
index 9a0561b..3c960fa 100644
--- a/kernel/linker.ld
+++ b/kernel/linker.ld
@@ -9,6 +9,12 @@ CHECKSUM = -(MAGIC + FLAGS);
 
 SECTIONS
 {
+    /DISCARD/ :
+    {
+        *(.fini)
+        *(.comment)
+    }
+
     /* It's a raw solution. */
     /* Automatic generation of filling .multiboot section needs. */
     .multiboot ALIGN(START_ADDR, CONSTANT(MAXPAGESIZE)) : ALIGN(CONSTANT(MAXPAGESIZE))
@@ -22,13 +28,21 @@ SECTIONS
     {
         _text = .;
         *(.text*)
+        *(.init)
+        . = ALIGN(CONSTANT(MAXPAGESIZE));
         _etext = .;
     } > REGION_TEXT
 
-    .rodata ALIGN(CONSTANT(MAXPAGESIZE)): ALIGN(CONSTANT(MAXPAGESIZE))
+    .rodata :
     {
         _rodata = .;
         *(.rodata*)
+        HIDDEN(__CTOR_LIST__ = .);
+        *(.ctors)
+        HIDDEN(__CTOR_END__ = .);
+        HIDDEN(__DTOR_LIST__ = .);
+        *(.dtors)
+        HIDDEN(__DTOR_END__ = .);
         _erodata = .;
     } > REGION_RODATA
 
@@ -51,14 +65,14 @@ SECTIONS
     {
         _stack = ABSOLUTE(.);
         . += 4 * CONSTANT(MAXPAGESIZE);
-        _estack = ABSOLUTE(.);
+        _estack = ABSOLUTE(.) - 1;
     } > REGION_DATA
 
     .kheap ALIGN(CONSTANT(MAXPAGESIZE)) : ALIGN(CONSTANT(MAXPAGESIZE))
     {
-        _startKheap = ABSOLUTE(.);
+        _kheap = ABSOLUTE(.);
         . += CONSTANT(MAXPAGESIZE);
-        _endKheap = ABSOLUTE(.);
+        _ekheap = ABSOLUTE(.) - 1;
     } > REGION_DATA
 
     .eh_frame :
@@ -68,10 +82,4 @@ SECTIONS
         _e_eh_frame = .;
     } > REGION_COMMON
 
-    .ctors :
-    {
-        SORT_BY_NAME(CONSTRUCTORS)
-    } > REGION_COMMON
-
-
 }