Re: gas generates incorrect ia64 unwind rlen values

[Keith Owens]

On 16 Dec 2002 16:25:15 -0500, 
Jim Wilson <address@hidden> wrote:
>>RH 7.2-ia64, Dec 15 2001.
>
>The tools for this release were based on Summer 2000 FSF sources with patches.
>So they are about 2.5 years old now.

I know, but AFAICT it is the latest that is available on the RH site
for ia64.  If there is a more recent binutils ia64.rpm, point me at it
and I will try it.

>Are you sure this is an assembler problem?  If the compiler is emitting bad
>unwind directives, then it could be a compiler problem.  You didn't mention
>anything about looking at assembly code.

See my follow up mail about memset.S, that is pure assembler.  But just
to be sure, here is traps.c::ia64_fault assembler output.  No spurious
unwind directives from gcc but unwind is still wrong.

.text
        .align 16
        .align 32
        .global ia64_fault#
        .proc ia64_fault#
ia64_fault:
        .prologue 12, 37
        .save ar.pfs, r38
        alloc r38 = ar.pfs, 4, 3, 5, 0
        .fframe 256
        adds r12 = -256, r12
        movl r14 = 34359738383
        .save rp, r37
        mov r37 = b0
        ;;
        .body
        and r14 = r14, r33
        movl r15 = 34359738372
[454 lines omitted for brevity]
.L2933:
        mov r39 = r36
        mov r40 = r33
        br.call.sptk.many b0 = ia32_intercept#
        ;;
        cmp4.ne p6, p7 = 0, r8
        (p7) br.cond.dpnt .L2880
        addl r39 = @ltoff(.LC39), gp
        ;;
        ld8 r39 = [r39]
        br.call.sptk.many b0 = printk#
        ;;
        adds r14 = 8, r36
        addl r39 = @ltoff(.LC40), gp
        mov r41 = r34
        ;;
        ld8 r40 = [r14]
        ld8 r39 = [r39]
        mov r42 = r33
        mov r43 = r35
        br.call.sptk.many b0 = printk#
[unwind tables in the object say that the body ends here]
        ;;
        addl r39 = 11, r0
        mov r40 = r13
        br.call.sptk.many b0 = force_sig#
        ;;
        br .L2880
.L2935:
        adds r34 = 144, r12
        addl r40 = @ltoff(.LC41), gp
        shr.u r41 = r33, 16
        ;;
        mov r39 = r34
        ld8 r40 = [r40]
        br.call.sptk.many b0 = sprintf#
        ;;
        br .L2882
.L2936:
        adds r34 = 144, r12
        addl r40 = @ltoff(.LC42), gp
        mov r41 = r32
        ;;
        mov r39 = r34
        ld8 r40 = [r40]
        br.call.sptk.many b0 = sprintf#
        ;;
.L2882:
        mov r39 = r34
        mov r40 = r36
        mov r41 = r33
        br.call.sptk.many b0 = die_if_kernel#
        ;;
        addl r39 = 4, r0
        mov r40 = r13
        br.call.sptk.many b0 = force_sig#
        ;;
.L2880:
        mov ar.pfs = r38
        mov b0 = r37
        .restore sp
        adds r12 = 256, r12
        br.ret.sptk.many b0
        .endp ia64_fault#