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Add STARTUP and LOWCODE segments

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git-svn-id: svn://svn.cc65.org/cc65/trunk@1601 b7a2c559-68d2-44c3-8de9-860c34a00d81
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cuz 2002-11-23 11:10:50 +00:00
parent fe75b5c3f3
commit d7d86886b6
4 changed files with 25 additions and 32 deletions
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17
libsrc/apple2/crt0.s
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@ -7,7 +7,7 @@
.export _exit
.import initlib, donelib
.import zerobss, push0
.import __CODE_LOAD__, __BSS_LOAD__ ; Linker generated
.import __STARTUP_LOAD__, __BSS_LOAD__ ; Linker generated
.import _main
.include "zeropage.inc"
@ -18,13 +18,18 @@
.segment "EXEHDR"
.word __CODE_LOAD__ ; Start address
.word __BSS_LOAD__ - __CODE_LOAD__ ; Size
.word __STARTUP_LOAD__ ; Start address
.word __BSS_LOAD__ - __STARTUP_LOAD__ ; Size
; ------------------------------------------------------------------------
; Actual code
; Create an empty LOWCODE segment to avoid linker warnings
.code
.segment "LOWCODE"
; ------------------------------------------------------------------------
; Place the startup code in a special segment.
.segment "STARTUP"
ldx #zpspace-1
L1: lda sp,x
@ -91,6 +96,8 @@ L2: lda zpsave,x
jmp RESTOR
; ------------------------------------------------------------------------
; Data
.data

34
libsrc/atmos/crt0.s
View file

@ -13,35 +13,14 @@
; ------------------------------------------------------------------------
; Define and export the ZP variables for the Oric runtime
; Create an empty LOWCODE segment to avoid linker warnings
.exportzp sp, sreg, regsave
.exportzp ptr1, ptr2, ptr3, ptr4
.exportzp tmp1, tmp2, tmp3, tmp4
.exportzp regbank, zpspace
.zeropage
zpstart = *
sp: .res 2 ; Stack pointer
sreg: .res 2 ; Secondary register/high 16 bit for longs
regsave: .res 2 ; slot to save/restore (E)AX into
ptr1: .res 2
ptr2: .res 2
ptr3: .res 2
ptr4: .res 2
tmp1: .res 1
tmp2: .res 1
tmp3: .res 1
tmp4: .res 1
regbank: .res 6 ; 6 byte register bank
zpspace = * - zpstart ; Zero page space allocated
.code
.segment "LOWCODE"
; ------------------------------------------------------------------------
; Actual code
; Place the startup code in a special segment.
.segment "STARTUP"
; Clear the BSS data
@ -82,6 +61,9 @@ _exit: jsr donelib ; Run module destructors
rts
; ------------------------------------------------------------------------
; Data
.bss
spsave: .res 1

4
src/ld65/cfg/apple2.cfg
View file

@ -5,7 +5,9 @@ MEMORY {
}
SEGMENTS {
EXEHDR: load = HEADER, type = ro;
CODE: load = RAM, type = ro, define = yes;
STARTUP: load = RAM, type = ro, define = yes;
LOWCODE: load = RAM, type = ro;
CODE: load = RAM, type = ro;
RODATA: load = RAM, type = ro;
DATA: load = RAM, type = rw;
BSS: load = RAM, type = bss, define = yes;

2
src/ld65/cfg/atmos.cfg
View file

@ -3,6 +3,8 @@ MEMORY {
RAM: start = $0600, size = $9200, define = yes, file = %O;
}
SEGMENTS {
SATRTUP: load = RAM, type = wprot;
LOWCODE: load = RAM, type = wprot;
CODE: load = RAM, type = wprot;
RODATA: load = RAM, type = wprot;
DATA: load = RAM, type = rw;