__builtin_longjmp problem

[Artem Alimarine <aalimari@best.ms.philips.com>]

Hello,

I use gcc-2.95 on Cygwin for i960-unknown-coff. The exception handling does not work. As far as I could find it is due to __builtin_setjmp/longjmp. The following code hangs on VxWorks 5.1:

int jbuf[1024];

if(__builtin_setjmp(jbuf) == 0) {
     __builtin_longjmp(jbuf, 1);
} else {
     printf("jumped\n");
}

In the assembler I can see that the code for longjmp is wrong:

code generated for __bulitin_setjmp (seems OK for me):

    ldconst _jbuf,g4
    st fp,(g4)
    ldconst L17,g5
    st g5,4(g4)
    st sp,8(g4)
    mov 0,g4
 
code generated for __buitin_longjmp(seems wrong):

    ldconst _jbuf,g4
    flushreg
    mov 1,fp
    lda -64(fp),pfp
    ld (g4),g5
    st g5,-56(fp)
    ld 8(g4),g4
    st g4,-60(fp)
    ret

How do I fix this?

Is that possible to make compiler to generate calls to a  setjmp/longjmp from the library for exception handling?
I've seen a macro DONT_USE_BUITIN_SETJMP in the source code. How do I turn it on for buiding gcc?

Best regards
Artem

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