xavi/sdcc-gas/src/SDCCasm.c, branch master

Fixed github sdcc-gas issues #1, #2 and #4

2019-11-06T03:34:26+00:00

Issue #1 was caused because code_name and data_name had been incorrectly defined as const-qualified pointers, but this must be an exception for the z80 backend, as stated by the comments. Issue #2 has been solved by removing the --gas switch from SDCCmain.c, renaming it to "--asm=" (as requested by PKK) and moved to STM8's main.c, so the option is limited to those targets supporting it. Issue #4 was because of SDCCglue.c, that generated local labels using "!labeldef" instead of "!slabeldef", causing those __str_%d labels to be printed as "__str_%d::" (the double colons stand for globa label according to asxxx documentation) instead of "__str_%d":". I ran the regression tests and most of them passed, but "wchar" returned another "Multiple definition of..." error that I cannot explain so far. It is better than nothing, though.

DWARF2 debugging (almost) working

2019-10-24T23:05:12+00:00

Stack pointer setup is removed since it is already set to 0x3FF for the STM8S003F3/K3, according to the datasheet.

Got hi8/lo8 asm instructions working

2019-10-24T04:19:28+00:00

GNU as does not support the # notation asxxx uses to determine address LSB and MSB. Instead, two instructions have been created on GNU as and ld (see my stm8-binutils-gdb fork) for this purpose. On the other hand, I'm upset to see gen.c does not provide an assembler-agnostic implementation when SDCCasm.c already provides tools already meant for this. OTOH, support for the "-C" has been added for --gas.

More work on GNU as generation

2019-10-20T22:22:00+00:00

On _gas_mapping, label definitions do not allow "::". ":" must be used instead. gasOutput is now part of "options". Unneeded sections, such as HOME/GSINIT/etc., are no longer declared and/or defined. GNU as just does not need them. Startup function name must equal "_start" for GNU ld. The value of some macros, such as CODE_NAME or DATA_NAME, must change according to options.gasOutput, as "CODE" or "DATA" (among many others) are not understood by GNU as. STM8 port now selects GNU as format on --gas switch enabled.

Creating GAS port in SDCCasm

2019-10-19T01:44:47+00:00

SDCCasm proved a much more elegant way to implement GAS support for SDCC. In fact, I was surprised to see there was already an attempt that had been commented out. stm8-as only complaints about those nasty "Smain ==." statements, but that should be easy to fix.

sdcc-3.9.0 fork implementing GNU assembler syntax

2019-10-17T22:31:54+00:00

This fork aims to provide better support for stm8-binutils