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Apple GEOS reserves beside the main app area at $4000-$C000 a secondary app area at $0C00-$2000. While it was an elegant idea to use that secondary area for overlays at the end of the day those 5 kB are just too small. So now overlays go at the end of the main area (as with GEOS 64/128).
However the stack (usually 1 kB) can be securely placed in the secondary area without effort from the side of the developer. The rest of the secondary area (usually 4 kB) is made available to the developer as (uninitialized) 'EXTBSS'. git-svn-id: svn://svn.cc65.org/cc65/trunk@5696 b7a2c559-68d2-44c3-8de9-860c34a00d81
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@ -6,8 +6,8 @@
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.export _exit
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.export __STARTUP__ : absolute = 1 ; Mark as startup
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.import __VLIR0_START__, __VLIR0_SIZE__ ; Linker generated
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.import __STACKSIZE__, __BACKBUFSIZE__ ; Linker generated
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.import __STACKADDR__, __STACKSIZE__ ; Linker generated
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.import __BACKBUFSIZE__ ; Linker generated
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.import initlib, donelib
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.import callmain
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.import zerobss
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@ -46,8 +46,8 @@
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; Setup stack.
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lda #<(__VLIR0_START__ + __VLIR0_SIZE__ + __STACKSIZE__)
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ldx #>(__VLIR0_START__ + __VLIR0_SIZE__ + __STACKSIZE__)
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lda #<(__STACKADDR__ + __STACKSIZE__)
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ldx #>(__STACKADDR__ + __STACKSIZE__)
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sta sp
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stx sp+1
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@ -828,7 +828,7 @@ static void DoMemory (void)
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stacksize);
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}
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if (overlaysize != -1 && apple == 0) {
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if (overlaysize != -1) {
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fprintf (outputSFile,
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"\t.export __OVERLAYSIZE__ : absolute = $%04x\n\n",
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overlaysize);
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@ -1,14 +1,15 @@
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SYMBOLS {
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__STACKSIZE__: type = weak, value = $0400;
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__BACKBUFSIZE__: type = weak, value = $2000;
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__OVERLAYSIZE__: type = weak, value = $2000 - $0C00;
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__OVERLAYADDR__: type = weak, value = $0C00;
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__VLIR0END__: type = weak, value = $C000 - __BACKBUFSIZE__ - __STACKSIZE__;
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__OVERLAYSIZE__: type = weak, value = $0000;
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__OVERLAYADDR__: type = weak, value = $C000 - __BACKBUFSIZE__ - __OVERLAYSIZE__;
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__STACKSIZE__: type = weak, value = $0400;
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__STACKADDR__: type = weak, value = $2000 - __STACKSIZE__;
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}
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MEMORY {
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CVT: file = %O, start = $0, size = $20000;
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ZP: define = yes, start = $80, size = $1A + $06;
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VLIR0: define = yes, start = $4000, size = __VLIR0END__ - $4000;
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EXT: define = yes, start = $0C00, size = __STACKADDR__ - $0C00;
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VLIR0: define = yes, start = $4000, size = __OVERLAYADDR__ - $4000;
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VLIR1: define = yes, start = __OVERLAYADDR__, size = __OVERLAYSIZE__;
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VLIR2: define = yes, start = __OVERLAYADDR__, size = __OVERLAYSIZE__;
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VLIR3: define = yes, start = __OVERLAYADDR__, size = __OVERLAYSIZE__;
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@ -32,6 +33,7 @@ MEMORY {
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SEGMENTS {
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ZEROPAGE: type = zp, load = ZP;
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EXTZP: type = zp, load = ZP;
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EXTBSS: type = bss, load = EXT optional = yes;
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FILEINFO: type = ro, load = CVT, offset = $002;
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RECORDS: type = ro, load = CVT, offset = $100, optional = yes;
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DIRENTRY: type = ro, load = CVT, offset = $180;
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@ -1,14 +1,14 @@
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SYMBOLS {
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__STACKSIZE__: type = weak, value = $0400;
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__BACKBUFSIZE__: type = weak, value = $2000;
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__OVERLAYSIZE__: type = weak, value = $0000;
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__OVERLAYADDR__: type = weak, value = $8000 - __BACKBUFSIZE__ - __OVERLAYSIZE__;
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__VLIR0END__: type = weak, value = __OVERLAYADDR__ - __STACKSIZE__;
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__STACKSIZE__: type = weak, value = $0400;
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__STACKADDR__: type = weak, value = __OVERLAYADDR__ - __STACKSIZE__;
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}
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MEMORY {
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CVT: file = %O, start = $0, size = $40000;
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ZP: define = yes, start = $58, size = $1A + $06;
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VLIR0: define = yes, start = $0400, size = __VLIR0END__ - $0400;
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VLIR0: define = yes, start = $0400, size = __STACKADDR__ - $0400;
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VLIR1: define = yes, start = __OVERLAYADDR__, size = __OVERLAYSIZE__;
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VLIR2: define = yes, start = __OVERLAYADDR__, size = __OVERLAYSIZE__;
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VLIR3: define = yes, start = __OVERLAYADDR__, size = __OVERLAYSIZE__;
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