xavi/sdcc-gas/src/stm8, 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.

_Noreturn-qualified functions now do not generate any ret/iret instruction

2019-10-29T23:23:41+00:00

Bugfixes

2019-10-29T23:04:10+00:00

Bugfixes on startup routine

2019-10-25T00:56:56+00:00

Memory addresses should be preceded by '#' when referring to them as integers

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.

Removed intermediate files

2019-10-24T21:18:52+00:00

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.

Implemented -c support for --gas

2019-10-23T01:57:38+00:00

STM8 code generator was generating some instructions in a "ld register, (#%d, register)" way, causing assembling errors on stm8-as. This is because stm8-as does not require the '#' character. A quick and dirty workaround has been implemented for this. Added new warning W_IGNORED_OPT_IN_ASM, which warns the user when both "--no-optsdcc-in-asm" and "--gas" are used (the first is ignored when the latter is active since GNU as does not accept the .optsdcc directive, as opposed to asxxx).

First working example!

2019-10-22T00:10:51+00:00

stm8/main.c: 0x8000 must contain the entry point aka "_start" for GNU as. Some work on supporting debugging symbols with --gas. Not finished yet.

Implemented --ffunction-sections

2019-10-21T14:08:26+00:00

Interrupt vector must be placed on section .vectors, according to the default linker script file. Intermediate labels must be $-terminated so they are not listed by nm.