fix: 🐛 Update linker script w/ segment attributes.

Double the size of the kernel (by including all
the necessary sections).

linker/aarch64.ld

@@ -5,65 +5,102 @@
  * Original code distributed under MIT, additional changes are under BlueOak-1.0.0
  */
 
-ENTRY(_boot_cores);
+__phys_load_addr = 0x80000;
+ENTRY(__phys_load_addr);
 
 PAGE_SIZE = 65536;
 
+/* Flags:
+ *     4 == R
+ *     5 == RX
+ *     6 == RW
+ *
+ * Segments are marked PT_LOAD below so that the ELF file provides virtual and physical addresses.
+ * It doesn't mean all of them need actually be loaded.
+ */
+PHDRS
+{
+    segment_boot_core_stack PT_LOAD FLAGS(6);
+    segment_code            PT_LOAD FLAGS(5);
+    segment_data            PT_LOAD FLAGS(6);
+}
+
 /* Symbols between __BOOT_START and __BOOT_END should be dropped after init is complete.
    Symbols between __RO_START and __RO_END are the kernel code.
    Symbols between __BSS_START and __BSS_END must be initialized to zero by startup code in the kernel.
 */
 SECTIONS
 {
-    . = 0x80000; /* AArch64 boot address is 0x80000, 4K-aligned */
+    __STACK_START = __phys_load_addr; /* Stack grows from here towards 0x0. */
-    __STACK_START = 0x80000; /* Stack grows from here towards 0x0. */
+    . = __phys_load_addr; /* AArch64 boot address is 0x80000, 4K-aligned */
-    __BOOT_START = .;
+
+    /***********************************************************************************************
+    * Code + RO Data
+    ***********************************************************************************************/
+
     .text :
     {
-        KEEP(*(.text.main.entry)) // Entry point must go first
+        /*******************************************************************************************
+        * Boot Code + Boot Data
+        *******************************************************************************************/
+
+        __BOOT_START = .;
+        KEEP(*(.text.main.entry))
         *(.text.boot)
-        //. = ALIGN(PAGE_SIZE);
         *(.data.boot)
         . = ALIGN(PAGE_SIZE); /* Here the boot code ends */
         __BOOT_END = .; // __BOOT_END must be PAGE_SIZE aligned
+
+        /*******************************************************************************************
+        * Regular Kernel Code
+        *******************************************************************************************/
+
         __RO_START = .;
-        *(.text .text.*)
+        *(.text*)
-    }
+    } :segment_code
 
     .vectors ALIGN(2048):
     {
         __EXCEPTION_VECTORS_START = .;
         KEEP(*(.vectors))
-    }
+    } :segment_code
 
     .rodata ALIGN(4):
     {
-        *(.rodata .rodata.*)
+        *(.rodata*)
         FILL(0x00)
-    }
+        . = ALIGN(PAGE_SIZE); /* Fill up to page size */
-    . = ALIGN(PAGE_SIZE); /* Fill up to page size */
+        __RO_END = .; /* __RO_END must be PAGE_SIZE aligned */
-    __RO_END = .; /* __RO_END must be PAGE_SIZE aligned */
+    } :segment_code
-    __DATA_START = .; /* __DATA_START must be PAGE_SIZE aligned */
 
-    .data : /* @todo align data to 4K -- it's already aligned up to __RO_END marker now */
+    /***********************************************************************************************
+    * Data + BSS
+    ***********************************************************************************************/
+
+    .data :
     {
-        *(.data .data.*)
+        __DATA_START = .; /* __DATA_START must be PAGE_SIZE aligned */
+        *(.data*)
         FILL(0x00)
-    }
+    } :segment_data
 
-    /* @todo could insert .data.boot here with proper alignment */
+    .bss ALIGN(PAGE_SIZE) (NOLOAD):
-
-    .bss ALIGN(8) (NOLOAD):
     {
         __BSS_START = .;
-        *(.bss .bss.*)
+        *(.bss*)
-        *(COMMON)
         . = ALIGN(PAGE_SIZE); /* Align up to page size */
         __BSS_END = .;
         __BSS_SIZE_U64S = (__BSS_END - __BSS_START) / 8;
-    }
+    } :segment_data
 
-    /DISCARD/ : { *(.comment) *(.gnu*) *(.note*) *(.eh_frame*) *(.text.chainboot*) }
+    /***********************************************************************************************
+    * Misc
+    ***********************************************************************************************/
+
+    .got : { *(.got*) }
+    ASSERT(SIZEOF(.got) == 0, "Relocation support not expected")
+
+    /DISCARD/ : { *(.comment*) *(.gnu*) *(.note*) *(.eh_frame*) *(.text.chainboot*) }
 }
 
 INCLUDE linker/aarch64-exceptions.ld