move stack after bss padding

2025-09-18 19:16:27 -04:00
parent 6caaf6aa6d
commit 137735431a
1 changed files with 8 additions and 6 deletions
--- a/src/stage2/stage2.nasm
+++ b/src/stage2/stage2.nasm
@@ -453,17 +453,19 @@ align 16, resb 1
 %define BIOSMemoryMap_SIZE 1024
 BIOSMemoryMap:
    resb BIOSMemoryMap_SIZE
-
-align 16, resb 1
-stack_bottom:
-    resb 2048
-stack_top:
 end_bss:
+; !!! End bss data !!!
+%define STACK_SIZE 0x1000       ; 4 KiB

 ; Pad to the cap (emits nothing in the file; only increases .bss virtual size).
 ; If BSS_SIZE > BSS_MAX_BYTES, this becomes negative and NASM errors out.
-%define BSS_MAX_BYTES 0x2000
+%define BSS_MAX_BYTES (0x2000 - STACK_SIZE)
 resb (BSS_MAX_BYTES - (end_bss - begin_bss))

+align 16, resb 1
+stack_bottom:
+    resb STACK_SIZE
+stack_top:
+
 ; Optional: keep a label for later math:
 bss_cap_end: