[Nasm-bugs] [Bug 3392694] New: [Feature request] Support ELF format segment base references

[noreply-nasm at dev.nasm.us]

https://bugzilla.nasm.us/show_bug.cgi?id=3392694

            Bug ID: 3392694
           Summary: [Feature request] Support ELF format segment base
                    references
           Product: NASM
           Version: 2.15 (development)
          Hardware: All
                OS: All
            Status: OPEN
          Severity: enhancement
          Priority: Medium
         Component: Assembler
          Assignee: nobody at nasm.us
          Reporter: pushbx at ulukai.org
                CC: chang.seok.bae at intel.com, gorcunov at gmail.com,
                    hpa at zytor.com, nasm-bugs at nasm.us
     Obtained from: Unknown

Here's my test case for this:
https://hg.ulukai.org/ecm/testia16/file/96c1c3739340/test7.asm

I am using https://github.com/tkchia/gcc-ia16 built using
https://github.com/tkchia/build-ia16/ The test case is to call a C function
from NASM assembly source. It works fine when the small model is used (one CS,
all function calls are near). However, with the medium model (several CS
allowed, all function calls are far) NASM does not support creating the proper
relocations for a far immediate call. Only calls from C into the NASM code are
possible right now.

$ model="-mcmodel=small"; farcall="-D_FARCALL=0"; nasm -I ../lmacros/ test7.asm
$farcall -f elf -o test7.asm.o && ia16-elf-gcc test7.c test7.asm.o $model -Os
-o test7.exe && dosemu -dumb -quiet -K "$PWD" -E test7.exe
About to Execute : test7.exe
Hello world from assembly!
a=AA11AA11 b=BB22 c=CC33
$ model="-mcmodel=medium"; farcall="-D_FARCALL"; nasm -I ../lmacros/ test7.asm
$farcall -f elf -o test7.asm.o && ia16-elf-gcc test7.c test7.asm.o $model -Os
-o test7.exe && dosemu -dumb -quiet -K "$PWD" -E test7.exe
test7.asm:32: error: ELF format does not support segment base references
$

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