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cc65/cfg/c64.cfg

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INI
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Adapted, to the c64 target, the INIT-segment overlay scheme from the apple2 targets. When a program starts running, INIT is moved from one place to another place. Then, INIT's code is executed; and, the first place is re-used for variables. After the INIT code has finished, the second place can be re-used by the heap and the C stack. That means that initiation code and data won't waste any RAM space after they stop being needed.
2015-10-05 09:47:43 +00:00
FEATURES {
STARTADDRESS: default = $0801;
}
Modified the builtin c64 config to force inclusion of the new exehdr module. git-svn-id: svn://svn.cc65.org/cc65/trunk@4863 b7a2c559-68d2-44c3-8de9-860c34a00d81
2010-11-14 11:51:43 +00:00
SYMBOLS {
Force inclusion of the load address. git-svn-id: svn://svn.cc65.org/cc65/trunk@4857 b7a2c559-68d2-44c3-8de9-860c34a00d81
2010-11-13 16:57:42 +00:00
__LOADADDR__: type = import;
Modified the builtin c64 config to force inclusion of the new exehdr module. git-svn-id: svn://svn.cc65.org/cc65/trunk@4863 b7a2c559-68d2-44c3-8de9-860c34a00d81
2010-11-14 11:51:43 +00:00
__EXEHDR__: type = import;
Minimal formatting adjustment. git-svn-id: svn://svn.cc65.org/cc65/trunk@5830 b7a2c559-68d2-44c3-8de9-860c34a00d81
2012-09-30 14:18:47 +00:00
__STACKSIZE__: type = weak, value = $0800; # 2k stack
Adapted, to the c64 target, the INIT-segment overlay scheme from the apple2 targets. When a program starts running, INIT is moved from one place to another place. Then, INIT's code is executed; and, the first place is re-used for variables. After the INIT code has finished, the second place can be re-used by the heap and the C stack. That means that initiation code and data won't waste any RAM space after they stop being needed.
2015-10-05 09:47:43 +00:00
__HIMEM__: type = weak, value = $D000;
- No more HEAP segment - RAM reduced by __STACKSIZE__ - Unified formatting git-svn-id: svn://svn.cc65.org/cc65/trunk@4633 b7a2c559-68d2-44c3-8de9-860c34a00d81
2010-03-21 17:10:17 +00:00
}
Moved the target configurations into separate files git-svn-id: svn://svn.cc65.org/cc65/trunk@416 b7a2c559-68d2-44c3-8de9-860c34a00d81
2000-10-31 18:08:25 +00:00
MEMORY {
Changed run location of INIT segment. So far the INIT segment was run from the later heap+stack. Now the INIT segment is run from the later BSS. The background is that so far the INIT segment was pretty small (from $80 to $180 bytes). But upcoming changes will increase the INIT segment in certain scenarios up to ~ $1000 bytes. So programs with very limited heap+stack might just not been able to move the INIT segment to its run location. But moving the INIT segment to the later BSS allows it to occupy the later BSS+heap+stack. In order to allow that the constructors are _NOT_ allowed anymore to access the BSS. Rather they must use the DATA segment or the new INITBSS segment. The latter isn't cleared at any point so the constructors may use it to expose values to the main program. However they must make sure to always write the values as they are not pre-initialized.
2015-10-14 20:52:09 +00:00
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__;
MOVE: file = %O, start = __INITBSS_LOAD__, size = __HIMEM__ - __BSS_RUN__;
INIT: file = "", start = __BSS_RUN__, size = __HIMEM__ - __BSS_RUN__;
Moved the target configurations into separate files git-svn-id: svn://svn.cc65.org/cc65/trunk@416 b7a2c559-68d2-44c3-8de9-860c34a00d81
2000-10-31 18:08:25 +00:00
}
SEGMENTS {
Changed run location of INIT segment. So far the INIT segment was run from the later heap+stack. Now the INIT segment is run from the later BSS. The background is that so far the INIT segment was pretty small (from $80 to $180 bytes). But upcoming changes will increase the INIT segment in certain scenarios up to ~ $1000 bytes. So programs with very limited heap+stack might just not been able to move the INIT segment to its run location. But moving the INIT segment to the later BSS allows it to occupy the later BSS+heap+stack. In order to allow that the constructors are _NOT_ allowed anymore to access the BSS. Rather they must use the DATA segment or the new INITBSS segment. The latter isn't cleared at any point so the constructors may use it to expose values to the main program. However they must make sure to always write the values as they are not pre-initialized.
2015-10-14 20:52:09 +00:00
ZEROPAGE: load = ZP, type = zp;
LOADADDR: load = LOADADDR, type = ro;
EXEHDR: load = HEADER, type = ro;
STARTUP: load = MAIN, type = ro;
LOWCODE: load = MAIN, type = ro, optional = yes;
CODE: load = MAIN, type = ro;
RODATA: load = MAIN, type = ro;
DATA: load = MAIN, type = rw;
INITBSS: load = MAIN, type = bss, define = yes;
BSS: load = MAIN, type = bss, define = yes;
INIT: load = MOVE, run = INIT, type = ro, define = yes;
Moved the target configurations into separate files git-svn-id: svn://svn.cc65.org/cc65/trunk@416 b7a2c559-68d2-44c3-8de9-860c34a00d81
2000-10-31 18:08:25 +00:00
}
Move the constructor tables into the INIT segment git-svn-id: svn://svn.cc65.org/cc65/trunk@3403 b7a2c559-68d2-44c3-8de9-860c34a00d81
2005-02-26 09:06:12 +00:00
FEATURES {
Just some beautification. git-svn-id: svn://svn.cc65.org/cc65/trunk@5984 b7a2c559-68d2-44c3-8de9-860c34a00d81
2013-02-12 20:55:19 +00:00
CONDES: type = constructor,
label = __CONSTRUCTOR_TABLE__,
count = __CONSTRUCTOR_COUNT__,
segment = INIT;
CONDES: type = destructor,
label = __DESTRUCTOR_TABLE__,
count = __DESTRUCTOR_COUNT__,
segment = RODATA;
CONDES: type = interruptor,
label = __INTERRUPTOR_TABLE__,
count = __INTERRUPTOR_COUNT__,
segment = RODATA,
Have the callirq module export __CALLIRQ__ and changed all config files so this symbol is a forced import for all interruptors. git-svn-id: svn://svn.cc65.org/cc65/trunk@5902 b7a2c559-68d2-44c3-8de9-860c34a00d81
2012-11-03 21:59:15 +00:00
import = __CALLIRQ__;
Add new symbol __STACKSIZE__ to all linker configurations. git-svn-id: svn://svn.cc65.org/cc65/trunk@622 b7a2c559-68d2-44c3-8de9-860c34a00d81
2001-03-10 14:24:58 +00:00
}
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