[Bug ld/31503] [hppa] Unsupported 14-bit PA 2.0 relocations for 32-bit (narrow) mode (elf32-hppa.c)

[danglin at gcc dot gnu.org]

https://sourceware.org/bugzilla/show_bug.cgi?id=31503

--- Comment #2 from John David Anglin <danglin at gcc dot gnu.org> ---
Created attachment 15431
  --> https://sourceware.org/bugzilla/attachment.cgi?id=15431&action=edit
Assembly file

Attached is an assembly file demonstrating the problem.  It's derived
from the assembly output at -O1 for the gcc.c-torture/execute/packed-aligned.c
test.

I changed this code

        addil LR'g_expect-$global$,%r27
        fstd %fr22,RR'g_expect-$global$(%r1)

in main to

        addil LR'g_expect-$global$,%r27
        fstd %fr22,RR'g_expect-$global$(%r1)
        ldo RR'g_expect-$global$(%r1),%r1
        fstd %fr22,0(%r1)

so I could see what was happening to the symbolic relocation in the fstd
instruction.

This is the code in the final executable:

   10574:       2b 60 00 00     addil L%0,dp,r1
   10578:       70 36 00 20     std r22,10(r1)
   1057c:       34 21 00 20     ldo 10(r1),r1
   10580:       2c 20 12 16     fstd fr22,0(r1)

The fstd instruction has changed to a std instruction.

In the .o object file, we have:

  7c:   2b 60 00 00     addil L%0,dp,r1
  80:   70 36 00 02     fstd fr22,0(r1)
  84:   34 21 00 00     ldo 0(r1),r1
  88:   2c 20 12 16     fstd fr22,0(r1)

We have the following relocations:

0000007c R_PARISC_DPREL21L  g_expect
00000080 R_PARISC_DPREL14R  g_expect
00000084 R_PARISC_DPREL14R  g_expect

The format 3 (im10a) variants of ldd and fldd differ in bit 30.  ldd has a
0 and fldd a 1.

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