6502/cc65
1
0
Fork 0
mirror of https://github.com/cc65/cc65.git synced 2025-01-14 00:32:08 +00:00
Code Issues Projects Releases Wiki Activity

Added LOWCODE and STARTUP segments

Browse Source 
git-svn-id: svn://svn.cc65.org/cc65/trunk@1600 b7a2c559-68d2-44c3-8de9-860c34a00d81
This commit is contained in:
cuz 2002-11-22 23:50:45 +00:00
parent 4f93a1c99f
commit fe75b5c3f3
2 changed files with 14 additions and 4 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

16
libsrc/c64/crt0.s
View File

@ -1,4 +1,4 @@
;
;
; Startup code for cc65 (C64 version)
;
; This must be the *first* file on the linker command line
@ -15,19 +15,24 @@
.include "c64.inc"
.code
; ------------------------------------------------------------------------
; Create an empty LOWCODE segment to avoid linker warnings
.segment "LOWCODE"
; ------------------------------------------------------------------------
; Place the startup code in a special segment.
.segment "STARTUP"
; BASIC header with a SYS call
.org $7FF
.word Head ; Load address
Head: .word @Next
.word 1000 ; Line number
.byte $9E,"2061" ; SYS 2061
.byte $00 ; End of BASIC line
@Next: .word 0 ; BASIC end marker
.reloc
; ------------------------------------------------------------------------
; Actual code
@ -103,6 +108,9 @@ L2: lda zpsave,x
jmp RESTOR
; ------------------------------------------------------------------------
; Data
.data
zpsave: .res zpspace

2
src/ld65/cfg/c64.cfg
View File

@ -3,6 +3,8 @@ MEMORY {
RAM: start = $7FF, size = $c801, define = yes, file = %O;
}
SEGMENTS {
STARTUP: load = RAM, type = wprot;
LOWCODE: load = RAM, type = wprot;
CODE: load = RAM, type = wprot;
RODATA: load = RAM, type = wprot;
DATA: load = RAM, type = rw;