| /* Target-dependent code for OpenVMS IA-64. |
| |
| Copyright (C) 2012-2021 Free Software Foundation, Inc. |
| |
| This file is part of GDB. |
| |
| This program is free software; you can redistribute it and/or modify |
| it under the terms of the GNU General Public License as published by |
| the Free Software Foundation; either version 3 of the License, or |
| (at your option) any later version. |
| |
| This program is distributed in the hope that it will be useful, |
| but WITHOUT ANY WARRANTY; without even the implied warranty of |
| MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| GNU General Public License for more details. |
| |
| You should have received a copy of the GNU General Public License |
| along with this program. If not, see <http://www.gnu.org/licenses/>. */ |
| |
| #include "defs.h" |
| #include "frame-unwind.h" |
| #include "ia64-tdep.h" |
| #include "osabi.h" |
| #include "gdbtypes.h" |
| #include "gdbcore.h" |
| #include "gdbarch.h" |
| |
| #ifdef HAVE_LIBUNWIND_IA64_H |
| |
| /* Libunwind callback accessor function to acquire procedure unwind-info. */ |
| |
| static int |
| ia64_vms_find_proc_info_x (unw_addr_space_t as, unw_word_t ip, |
| unw_proc_info_t *pi, |
| int need_unwind_info, void *arg) |
| { |
| enum bfd_endian byte_order = gdbarch_byte_order (target_gdbarch ()); |
| gdb_byte buf[32]; |
| const char *annex = core_addr_to_string (ip); |
| LONGEST res; |
| CORE_ADDR table_addr; |
| unsigned int info_len; |
| |
| res = target_read (current_inferior ()->top_target (), |
| TARGET_OBJECT_OPENVMS_UIB, |
| annex + 2, buf, 0, sizeof (buf)); |
| |
| if (res != sizeof (buf)) |
| return -UNW_ENOINFO; |
| |
| pi->format = UNW_INFO_FORMAT_REMOTE_TABLE; |
| pi->start_ip = extract_unsigned_integer (buf + 0, 8, byte_order); |
| pi->end_ip = extract_unsigned_integer (buf + 8, 8, byte_order); |
| pi->gp = extract_unsigned_integer (buf + 24, 8, byte_order); |
| table_addr = extract_unsigned_integer (buf + 16, 8, byte_order); |
| |
| if (table_addr == 0) |
| { |
| /* No unwind data. */ |
| pi->unwind_info = NULL; |
| pi->unwind_info_size = 0; |
| return 0; |
| } |
| |
| res = target_read_memory (table_addr, buf, 8); |
| if (res != 0) |
| return -UNW_ENOINFO; |
| |
| /* Check version. */ |
| if (extract_unsigned_integer (buf + 6, 2, byte_order) != 1) |
| return -UNW_EBADVERSION; |
| info_len = extract_unsigned_integer (buf + 0, 4, byte_order); |
| pi->unwind_info_size = 8 * info_len; |
| |
| /* Read info. */ |
| pi->unwind_info = xmalloc (pi->unwind_info_size); |
| |
| res = target_read_memory (table_addr + 8, |
| (gdb_byte *) pi->unwind_info, pi->unwind_info_size); |
| if (res != 0) |
| { |
| xfree (pi->unwind_info); |
| pi->unwind_info = NULL; |
| return -UNW_ENOINFO; |
| } |
| |
| /* FIXME: Handle OSSD (OS Specific Data). This extension to ia64 unwind |
| information by OpenVMS is currently not handled by libunwind, but |
| looks to be used only in very specific context, and is not generated by |
| GCC. */ |
| |
| pi->lsda = table_addr + 8 + pi->unwind_info_size; |
| if (extract_unsigned_integer (buf + 4, 2, byte_order) & 3) |
| { |
| pi->lsda += 8; |
| /* There might be an handler, but this is not used for unwinding. */ |
| pi->handler = 0; |
| } |
| |
| return 0; |
| } |
| |
| /* Libunwind callback accessor function for cleanup. */ |
| |
| static void |
| ia64_vms_put_unwind_info (unw_addr_space_t as, |
| unw_proc_info_t *pip, void *arg) |
| { |
| /* Nothing required for now. */ |
| } |
| |
| /* Libunwind callback accessor function to get head of the dynamic |
| unwind-info registration list. */ |
| |
| static int |
| ia64_vms_get_dyn_info_list (unw_addr_space_t as, |
| unw_word_t *dilap, void *arg) |
| { |
| return -UNW_ENOINFO; |
| } |
| |
| /* Set of libunwind callback acccessor functions. */ |
| static unw_accessors_t ia64_vms_unw_accessors; |
| static unw_accessors_t ia64_vms_unw_rse_accessors; |
| |
| /* Set of ia64-libunwind-tdep gdb callbacks and data for generic |
| ia64-libunwind-tdep code to use. */ |
| static struct libunwind_descr ia64_vms_libunwind_descr; |
| |
| #endif /* HAVE_LIBUNWIND_IA64_H */ |
| |
| static void |
| ia64_openvms_init_abi (struct gdbarch_info info, struct gdbarch *gdbarch) |
| { |
| set_gdbarch_long_double_format (gdbarch, floatformats_ia64_quad); |
| |
| #ifdef HAVE_LIBUNWIND_IA64_H |
| /* Override the default descriptor. */ |
| ia64_vms_unw_accessors = ia64_unw_accessors; |
| ia64_vms_unw_accessors.find_proc_info = ia64_vms_find_proc_info_x; |
| ia64_vms_unw_accessors.put_unwind_info = ia64_vms_put_unwind_info; |
| ia64_vms_unw_accessors.get_dyn_info_list_addr = ia64_vms_get_dyn_info_list; |
| |
| ia64_vms_unw_rse_accessors = ia64_unw_rse_accessors; |
| ia64_vms_unw_rse_accessors.find_proc_info = ia64_vms_find_proc_info_x; |
| ia64_vms_unw_rse_accessors.put_unwind_info = ia64_vms_put_unwind_info; |
| ia64_vms_unw_rse_accessors.get_dyn_info_list_addr = ia64_vms_get_dyn_info_list; |
| |
| ia64_vms_libunwind_descr = ia64_libunwind_descr; |
| ia64_vms_libunwind_descr.accessors = &ia64_vms_unw_accessors; |
| ia64_vms_libunwind_descr.special_accessors = &ia64_vms_unw_rse_accessors; |
| |
| libunwind_frame_set_descr (gdbarch, &ia64_vms_libunwind_descr); |
| #endif |
| } |
| |
| void _initialize_ia64_vms_tdep (); |
| void |
| _initialize_ia64_vms_tdep () |
| { |
| gdbarch_register_osabi (bfd_arch_ia64, 0, GDB_OSABI_OPENVMS, |
| ia64_openvms_init_abi); |
| } |