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gdb/hppa: guess g packet size

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With qemu supporting 64 bit now, add some code to determine the
register size of a hppa remote target.

Signed-off-by: Sven Schnelle <svens@stackframe.org>
Approved-By: Simon Marchi <simon.marchi@efficios.com>
Change-Id: Iffade4e02d758b9cb20c8f206e812bf3205518f7
This commit is contained in:
Sven Schnelle
2025-11-10 22:07:17 +01:00
committed by Simon Marchi
parent cff14f47e1
commit ec0f74231c
1 changed files with 53 additions and 6 deletions
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59
gdb/hppa-tdep.c
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@@ -33,6 +33,8 @@
#include "trad-frame.h"
#include "frame-unwind.h"
#include "frame-base.h"
#include "remote.h"
#include "target-descriptions.h"
#include "gdbcore.h"
#include "cli/cli-cmds.h"
@@ -43,6 +45,14 @@
static bool hppa_debug = false;
/* Properties (for struct target_desc) describing the g/G packet
layout. */
#define PROPERTY_GP32 "internal: transfers-32bit-registers"
#define PROPERTY_GP64 "internal: transfers-64bit-registers"
static target_desc_up hppa_tdesc32;
static target_desc_up hppa_tdesc64;
/* Some local constants. */
static const int hppa32_num_regs = 128;
static const int hppa64_num_regs = 96;
@@ -2978,6 +2988,19 @@ hppa_skip_trampoline_code (const frame_info_ptr &frame, CORE_ADDR pc)
-- chastain 2003-12-18 */
static void
hppa_register_g_packet_guesses (struct gdbarch *gdbarch)
{
/* If the size matches the set of 32-bit or 64-bit integer registers,
assume that's what we've got. */
register_remote_g_packet_guess (gdbarch, hppa32_num_regs * 4,
hppa_tdesc32.get ());
register_remote_g_packet_guess (gdbarch, hppa64_num_regs * 8,
hppa_tdesc64.get ());
/* Otherwise we don't have a useful guess. */
}
static struct gdbarch *
hppa_gdbarch_init (struct gdbarch_info info, struct gdbarch_list *arches)
{
@@ -2991,15 +3014,34 @@ hppa_gdbarch_init (struct gdbarch_info info, struct gdbarch_list *arches)
= gdbarch_alloc (&info, gdbarch_tdep_up (new hppa_gdbarch_tdep));
hppa_gdbarch_tdep *tdep = gdbarch_tdep<hppa_gdbarch_tdep> (gdbarch);
/* Determine from the bfd_arch_info structure if we are dealing with
a 32 or 64 bits architecture. If the bfd_arch_info is not available,
then default to a 32bit machine. */
if (info.bfd_arch_info != NULL)
tdep->bytes_per_address =
info.bfd_arch_info->bits_per_address / info.bfd_arch_info->bits_per_byte;
/* Determine from the target description if we are dealing with
a 32 or 64 bits architecture. If the target description is not
available, then check whether bfd_arch_info could be used.
Otherwise default to a 32-bit machine.
*/
if (info.target_desc != nullptr)
{
if (tdesc_property (info.target_desc, PROPERTY_GP64) != nullptr)
tdep->bytes_per_address = 8;
else if (tdesc_property (info.target_desc, PROPERTY_GP32) != nullptr)
tdep->bytes_per_address = 4;
else
{
warning (_("The target returned a target description but this GDB "
"doesn't support target descriptions for the HP/PA"
"architecture. Assuming standard 32-bit register"
"layout."));
tdep->bytes_per_address = 4;
}
}
else if (info.bfd_arch_info != nullptr)
tdep->bytes_per_address =
info.bfd_arch_info->bits_per_address / info.bfd_arch_info->bits_per_byte;
else
tdep->bytes_per_address = 4;
hppa_register_g_packet_guesses (gdbarch);
tdep->find_global_pointer = hppa_find_global_pointer;
/* Some parts of the gdbarch vector depend on whether we are running
@@ -3122,6 +3164,11 @@ hppa_dump_tdep (struct gdbarch *gdbarch, struct ui_file *file)
INIT_GDB_FILE (hppa_tdep)
{
gdbarch_register (bfd_arch_hppa, hppa_gdbarch_init, hppa_dump_tdep);
hppa_tdesc32 = allocate_target_description ();
set_tdesc_property (hppa_tdesc32.get(), PROPERTY_GP32, "");
hppa_tdesc64 = allocate_target_description ();
set_tdesc_property (hppa_tdesc64.get(), PROPERTY_GP64, "");
add_cmd ("unwind", class_maintenance, unwind_command,
_("Print unwind table entry at given address."),