Re: PDP-11 ABI for cross compiler

[Aram Havarneanu <aram dot h at mgk dot ro>]

Well, I have a working compiler but the linker doesn't work or I am
not using it right. I took /lib from a 2.11BSD system.

$ uname -a
FreeBSD bsd.localdomain 8.0-RC1 FreeBSD 8.0-RC1 #0: Thu Sep 17
20:45:19 UTC 2009
root@almeida.cse.buffalo.edu:/usr/obj/usr/src/sys/GENERIC  i386
$ pdp11-bsd2.11-gcc -v
Using built-in specs.
Target: pdp11-bsd2.11
Configured with: ../gcc-4.1.2/configure --target=pdp11-bsd2.11
--without-headers --with-newlib --enable-languages=c --disable-shared
--enable-version-specific-runtime-libs
Thread model: single
gcc version 4.1.2
$ cat a.c
int
main()
{
        return 0;
}

$ pdp11-bsd2.11-gcc a.c
/usr/local/lib/gcc/pdp11-bsd2.11/4.1.2/libgcc.a(__main.o):__main.o:(.text+0x86):
undefined reference to `_atexit'
collect2: ld returned 1 exit status
$ pdp11-bsd2.11-gcc -c a.c
$ file a.o
a.o: PDP-11 executable not stripped
$ pdp11-bsd2.11-gcc -S a.c
$ cat a.s
        .text

        .even
        .globl _main
_main:

        ;       /* function prologue main*/
        ;/* switch cpu to double float, single integer */
        setd
        seti

        mov r5, -(sp)
        mov sp, r5
        ;/* end of prologue */

        jsr pc, ___main
        clr r0

        ;       /*function epilogue */
        mov r5, sp
        mov (sp)+, r5
        rts pc
        ;/* end of epilogue*/


$ pdp11-bsd2.11-gcc -static -nostartfiles -nodefaultlibs -nostdlib a.c
/var/tmp//ccgCzTH1.o:/var/tmp//ccgCzTH1.o:(.text+0xa): undefined
reference to `___main'
collect2: ld returned 1 exit status
$ pdp11-bsd2.11-ld -static -nodefaultlibs -nostartfiles -nostdlib a.o
a.o:a.o:(.text+0xa): undefined reference to `__main'

$

-- 
Aram Hăvărneanu