port-sparc64/58976: sparc64 gdb cannot debug 32-bit binaries

[uwe%stderr.spb.ru@localhost]

>Number:         58976
>Category:       port-sparc64
>Synopsis:       sparc64 gdb cannot debug 32-bit binaries
>Confidential:   no
>Severity:       serious
>Priority:       medium
>Responsible:    port-sparc64-maintainer
>State:          open
>Class:          sw-bug
>Submitter-Id:   net
>Arrival-Date:   Wed Jan 08 12:55:00 +0000 2025
>Originator:     Valery Ushakov
>Release:        NetBSD current
>Organization:
>Environment:
NetBSD aurinko 10.99.12 NetBSD 10.99.12 (ULTRA1) #0: Sat Nov  9 00:23:25 MSK 2024  uwe@majava:/home/uwe/work/netbsd/cvs/src/sys/arch/sparc64/compile/ULTRA1 sparc64

>Description:
sparc64 gdb cannot debug programs compiled on that same sparc64 in
32-bit mode with -m32.  I use sparc64 for some 32-bit sparc work and
no working debugger is a problem (sparc gdb doesn't work either b/c of
port-sparc64/58975).

>How-To-Repeat:
<uwe@aurinko:~> (1022) cat > hello.c
#include <stdio.h>

int
main()
{
	printf("hello, world\n");
	return 0;
}
<uwe@aurinko:~> (1023) cc -m32 -o hello -g hello.c
<uwe@aurinko:~> (1024) ./hello
hello, world
<uwe@aurinko:~> (1025) gdb -q ./hello
Reading symbols from ./hello...
(gdb) b main
Breakpoint 1 at 0x10784: file hello.c, line 6.
(gdb) r
Starting program: /home/uwe/hello

Program received signal SIGTRAP, Trace/breakpoint trap.
0x00000a06 in ?? ()
(gdb) bt
#0  0x00000a06 in ?? ()
(gdb)

>Fix: