Hello SDCC users,
I'm doing a project with the famous Z80 just for fun, and decided to use
the sdasz80 assembler. My project consists of multiple source files to
keep everything modular. I'm having a problem with the linking step.
I've 2 source files: boot.asm and numconv.asm:
; boot.asm:
.globl HexToU8
.area _START (ABS)
.org 0
ld SP, #0xFFFF
call HexToU8
...
; numconv.asm:
.globl HexToU8
.area _CODE (REL,CON)
HexToU8:
...
ret
As you can see, the boot.asm uses absolute placement because it needs to
be placed at the begning of the memory (it needs to be executed first).
The numconv.asm uses relative placement instead (it can be at any memory
position provided that the HexToU8 symbol is correctly adjusted by the
linker).
To compile and link I invoke the folowing commands:
$ sdasz80 -o src/numconv.asm
$ sdasz80 -o src/boot.asm
$ sdldz80 MemMonitor.ihx src/numconv.rel src/boot.rel -i
$ sdobjcopy -Iihex -Obinary --pad-to 65536 --gap-fill 255 MemMonitor.ihx
MemMonitor.bin
It seems to compile and link fine, but the final binary doesn't include
the numconv subroutines and the HexToU8 symbol assumes the value 0x0000.
With my understanding the linker tries to put the _CODE (REL, CON) area
at the 0x0000 address, but it gets overwritten with the _START (ABS)
area. How I tell the linker to put the _CODE area to any other available
address (not used by the _START area)?
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