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Cleaned up C64 linker configs.

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The BSS segment and the ONCE segment share the same start address. So they need to be placed in two different memory areas.

So far BSS was placed in the MAIN memory area and ONCE was placed in an additional memory area. Both memory areas were written to the output file. They just "happened" to be loadable and runnable at a stretch.

Now ONCE is placed in the MAIN memory area and BSS is placed in an additional memory area. Only MAIN is written to the output file. It becomes more obvious that BSS is "just" defined to share memory with ONCE.
This commit is contained in:
Oliver Schmidt 2016-03-13 14:32:07 +01:00
parent 084453ba57
commit a3a22733f8
4 changed files with 16 additions and 16 deletions
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2
cfg/c64-asm.cfg
View File

@ -10,11 +10,11 @@ MEMORY {
MAIN: file = %O, start = %S, size = $D000 - %S;
}
SEGMENTS {
ZEROPAGE: load = ZP, type = zp, optional = yes;
LOADADDR: load = LOADADDR, type = ro;
EXEHDR: load = MAIN, type = ro, optional = yes;
CODE: load = MAIN, type = rw, optional = yes;
RODATA: load = MAIN, type = ro, optional = yes;
DATA: load = MAIN, type = rw, optional = yes;
BSS: load = MAIN, type = bss, optional = yes;
ZEROPAGE: load = ZP, type = zp, optional = yes;
}

10
cfg/c64-overlay.cfg
View File

@ -1,5 +1,5 @@
FEATURES {
STARTADDRESS: default = $0801;
STARTADDRESS: default = $0801;
}
SYMBOLS {
__LOADADDR__: type = import;
@ -14,8 +14,8 @@ MEMORY {
ZP: file = "", define = yes, start = $0002, size = $001A;
LOADADDR: file = %O, start = %S - 2, size = $0002;
HEADER: file = %O, define = yes, start = %S, size = $000D;
MAIN: file = %O, define = yes, start = __HEADER_LAST__, size = __OVERLAYSTART__ - __STACKSIZE__ - __HEADER_LAST__;
INIT: file = %O, start = __BSS_RUN__, size = __HIMEM__ - __BSS_RUN__;
MAIN: file = %O, define = yes, start = __HEADER_LAST__, size = __HIMEM__ - __HEADER_LAST__;
BSS: file = "", start = __ONCE_RUN__, size = __OVERLAYSTART__ - __STACKSIZE__ - __ONCE_RUN__;
OVL1ADDR: file = "%O.1", start = __OVERLAYSTART__ - 2, size = $0002;
OVL1: file = "%O.1", start = __OVERLAYSTART__, size = __OVERLAYSIZE__;
OVL2ADDR: file = "%O.2", start = __OVERLAYSTART__ - 2, size = $0002;
@ -45,8 +45,8 @@ SEGMENTS {
RODATA: load = MAIN, type = ro;
DATA: load = MAIN, type = rw;
INIT: load = MAIN, type = rw;
BSS: load = MAIN, type = bss, define = yes;
ONCE: load = INIT, type = ro;
ONCE: load = MAIN, type = ro, define = yes;
BSS: load = BSS, type = bss, define = yes;
OVL1ADDR: load = OVL1ADDR, type = ro;
OVERLAY1: load = OVL1, type = ro, define = yes, optional = yes;
OVL2ADDR: load = OVL2ADDR, type = ro;

16
cfg/c64.cfg
View File

@ -1,5 +1,5 @@
FEATURES {
STARTADDRESS: default = $0801;
STARTADDRESS: default = $0801;
}
SYMBOLS {
__LOADADDR__: type = import;
@ -8,11 +8,11 @@ SYMBOLS {
__HIMEM__: type = weak, value = $D000;
}
MEMORY {
ZP: file = "", define = yes, start = $0002, size = $001A;
LOADADDR: file = %O, start = %S - 2, size = $0002;
HEADER: file = %O, define = yes, start = %S, size = $000D;
MAIN: file = %O, define = yes, start = __HEADER_LAST__, size = __HIMEM__ - __STACKSIZE__ - __HEADER_LAST__;
INIT: file = %O, start = __BSS_RUN__, size = __HIMEM__ - __BSS_RUN__;
ZP: file = "", define = yes, start = $0002, size = $001A;
LOADADDR: file = %O, start = %S - 2, size = $0002;
HEADER: file = %O, define = yes, start = %S, size = $000D;
MAIN: file = %O, define = yes, start = __HEADER_LAST__, size = __HIMEM__ - __HEADER_LAST__;
BSS: file = "", start = __ONCE_RUN__, size = __HIMEM__ - __STACKSIZE__ - __ONCE_RUN__;
}
SEGMENTS {
ZEROPAGE: load = ZP, type = zp;
@ -24,8 +24,8 @@ SEGMENTS {
RODATA: load = MAIN, type = ro;
DATA: load = MAIN, type = rw;
INIT: load = MAIN, type = rw;
BSS: load = MAIN, type = bss, define = yes;
ONCE: load = INIT, type = ro, define = yes;
ONCE: load = MAIN, type = ro, define = yes;
BSS: load = BSS, type = bss, define = yes;
}
FEATURES {
CONDES: type = constructor,

4
libsrc/c64/crt0.s
View File

@ -93,8 +93,8 @@ L1: lda sp,x
; Set up the stack.
lda #<(__MAIN_START__ + __MAIN_SIZE__ + __STACKSIZE__)
ldx #>(__MAIN_START__ + __MAIN_SIZE__ + __STACKSIZE__)
lda #<(__MAIN_START__ + __MAIN_SIZE__)
ldx #>(__MAIN_START__ + __MAIN_SIZE__)
sta sp
stx sp+1 ; Set argument stack ptr