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From: "luis_gustavo at mentor dot com" <sourceware-bugzilla@sourceware.org>
To: gdb-prs@sourceware.org
Subject: [Bug gdb/15550] New: powerpc gdb does not use
 Tag_GNU_Power_ABI_Struct_Return
Date: Thu, 30 May 2013 13:18:00 -0000
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X-Bugzilla-Product: gdb
X-Bugzilla-Component: gdb
X-Bugzilla-Version: HEAD
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X-Bugzilla-Severity: minor
X-Bugzilla-Who: luis_gustavo at mentor dot com
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http://sourceware.org/bugzilla/show_bug.cgi?id=15550

            Bug ID: 15550
           Summary: powerpc gdb does not use
                    Tag_GNU_Power_ABI_Struct_Return
           Product: gdb
           Version: HEAD
            Status: NEW
          Severity: minor
          Priority: P2
         Component: gdb
          Assignee: unassigned at sourceware dot org
          Reporter: luis_gustavo at mentor dot com

Although powerpc has a valid attribute Tag_GNU_Power_ABI_Struct_Return in
binutils, it is not taken into account by GDB to handle the struct return
convention for a specific target.

Small structures can be returned either in registers (r3/r4) or in memory.

--

/* For historic reasons, PPC 32 GNU/Linux follows PowerOpen rather
   than the 32 bit SYSV R4 ABI structure return convention - all
   structures, no matter their size, are put in memory.  Vectors,
   which were added later, do get returned in a register though.  */

static enum return_value_convention
ppc_linux_return_value (struct gdbarch *gdbarch, struct value *function,
                        struct type *valtype, struct regcache *regcache,
                        gdb_byte *readbuf, const gdb_byte *writebuf)
{
  if ((TYPE_CODE (valtype) == TYPE_CODE_STRUCT
       || TYPE_CODE (valtype) == TYPE_CODE_UNION)
      && !((TYPE_LENGTH (valtype) == 16 || TYPE_LENGTH (valtype) == 8)
           && TYPE_VECTOR (valtype)))
    return RETURN_VALUE_STRUCT_CONVENTION;
  else
    return ppc_sysv_abi_return_value (gdbarch, function, valtype, regcache,
                                      readbuf, writebuf);
}

--

The code above will return all the non-vector structures through memory, small
vector structures (8 or 16 bytes in length) in registers and big vector
structures in memory.

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