From 74d8048d9aa23b4b4a2ada39f68d1cbb9551200a Mon Sep 17 00:00:00 2001 From: uz <uz@b7a2c559-68d2-44c3-8de9-860c34a00d81> Date: Sun, 14 Nov 2010 17:00:40 +0000 Subject: [PATCH] Docs for new c64-asm.cfg. git-svn-id: svn://svn.cc65.org/cc65/trunk@4866 b7a2c559-68d2-44c3-8de9-860c34a00d81 --- doc/c64.sgml | 53 ++++++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 53 insertions(+) diff --git a/doc/c64.sgml b/doc/c64.sgml index 3a06eda76..93673eeaa 100644 --- a/doc/c64.sgml +++ b/doc/c64.sgml @@ -63,6 +63,59 @@ Special locations: </descrip><p> +<sect>Linker configurations<p> + +The ld65 linker comes with a builtin config file for the Commodore 64, +which is used via <tt/-t c64/ (and displayed via <tt/--dump-config c64/). The +c64 package comes with additional secondary linker config files, which are +used via <tt/-C <configfile>/. + + +<sect1>builtin config file<p> + +The builtin configuration is tailored to C programs. It supplies the load +address and a small BASIC stub that starts the compiled program using a SYS +command. + + +<sect1><tt/c64-asm.cfg/<p> + +This configuration is made for assembler programmers who don't need a special +setup. The default start address is $801. It can be changed with the +linker command line option <tt/--start-addr/. All standard segments with the +exception of <tt/zeropage/ are written to the output file and a two byte load +address is prepended. + +To use this config file, assemble with <tt/-t c64/ and link with <tt/-C +c64-asm.cfg/. The former will make sure that correct character translation is +in effect, while the latter supplies the actual config. When using <tt/cl65/, +use both command line options. + +Sample command line for <tt/cl65/: + +<tscreen><verb> +cl65 -o file.prg -t c64 -C c64-asm.cfg source.s +</verb></tscreen> + +To generate code that loads to $C000: + +<tscreen><verb> +cl65 -o file.prg --start-addr $C000 -t c64 -C c64-asm.cfg source.s +</verb></tscreen> + +It is also possible to add a small BASIC header to the program, that uses SYS +to jump to the program entry point (which is the start of the code segment). +The advantage is that the program can be started using RUN. + +To generate a program with a BASIC SYS header, use + +<tscreen><verb> +cl65 -o file.prg -u __EXEHDR__ -t c64 -C c64-asm.cfg source.s +</verb></tscreen> + +Please note that in this case a changed start address doesn't make sense, +since the program must be loaded to the BASIC start address. + <sect>Platform specific header files<p>