Actually make NASM enforce the checkpoints.

diff --git a/ldlinux.asm b/ldlinux.asm
index 12ab164..4f02fa0 100644 (file)
--- a/ldlinux.asm
+++ b/ldlinux.asm
@@ -738,6 +738,10 @@ bailmsg:   db 'Boot failed', 0Dh, 0Ah, 0
 
 bs_checkpt     equ $                   ; Must be <= 1EFh
 
+%if (bs_checkpt-$$) > 0x1EF
+%error "Boot sector overflow"
+%endif
+
                zb 1EFh-($-$$)
 bs_magic       equ $                   ; From here to the magic_len equ
                                        ; must match ldlinux_magic
@@ -1045,6 +1049,10 @@ safedumpregs:
 
 rl_checkpt     equ $                           ; Must be <= 400h
 
+%if (rl_checkpt-$$) > 0x400
+%error "Sector 1 overflow"
+%endif
+
 ; ----------------------------------------------------------------------------
 ;  End of code and data that have to be in the first sector
 ; ----------------------------------------------------------------------------