| /* Target-dependent code for OpenBSD/arm. |
| |
| Copyright (C) 2006-2024 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 "osabi.h" |
| #include "trad-frame.h" |
| #include "tramp-frame.h" |
| |
| #include "obsd-tdep.h" |
| #include "arm-tdep.h" |
| #include "solib-svr4.h" |
| |
| /* Signal trampolines. */ |
| |
| static void |
| armobsd_sigframe_init (const struct tramp_frame *self, |
| const frame_info_ptr &this_frame, |
| struct trad_frame_cache *cache, |
| CORE_ADDR func) |
| { |
| CORE_ADDR sp, sigcontext_addr, addr; |
| int regnum; |
| |
| /* We find the appropriate instance of `struct sigcontext' at a |
| fixed offset in the signal frame. */ |
| sp = get_frame_register_signed (this_frame, ARM_SP_REGNUM); |
| sigcontext_addr = sp + 16; |
| |
| /* PC. */ |
| trad_frame_set_reg_addr (cache, ARM_PC_REGNUM, sigcontext_addr + 76); |
| |
| /* GPRs. */ |
| for (regnum = ARM_A1_REGNUM, addr = sigcontext_addr + 12; |
| regnum <= ARM_LR_REGNUM; regnum++, addr += 4) |
| trad_frame_set_reg_addr (cache, regnum, addr); |
| |
| trad_frame_set_id (cache, frame_id_build (sp, func)); |
| } |
| |
| static const struct tramp_frame armobsd_sigframe = |
| { |
| SIGTRAMP_FRAME, |
| 4, |
| { |
| { 0xe28d0010, ULONGEST_MAX }, /* add r0, sp, #16 */ |
| { 0xef000067, ULONGEST_MAX }, /* swi SYS_sigreturn */ |
| { 0xef000001, ULONGEST_MAX }, /* swi SYS_exit */ |
| { 0xeafffffc, ULONGEST_MAX }, /* b . - 8 */ |
| { TRAMP_SENTINEL_INSN, ULONGEST_MAX } |
| }, |
| armobsd_sigframe_init |
| }; |
| |
| |
| /* Override default thumb breakpoints. */ |
| static const gdb_byte arm_obsd_thumb_le_breakpoint[] = {0xfe, 0xdf}; |
| static const gdb_byte arm_obsd_thumb_be_breakpoint[] = {0xdf, 0xfe}; |
| |
| static void |
| armobsd_init_abi (struct gdbarch_info info, |
| struct gdbarch *gdbarch) |
| { |
| arm_gdbarch_tdep *tdep = gdbarch_tdep<arm_gdbarch_tdep> (gdbarch); |
| |
| if (tdep->fp_model == ARM_FLOAT_AUTO) |
| tdep->fp_model = ARM_FLOAT_SOFT_VFP; |
| |
| tramp_frame_prepend_unwinder (gdbarch, &armobsd_sigframe); |
| |
| /* OpenBSD/arm uses SVR4-style shared libraries. */ |
| set_solib_svr4_fetch_link_map_offsets |
| (gdbarch, svr4_ilp32_fetch_link_map_offsets); |
| set_gdbarch_skip_solib_resolver (gdbarch, obsd_skip_solib_resolver); |
| |
| tdep->jb_pc = 24; |
| tdep->jb_elt_size = 4; |
| |
| set_gdbarch_iterate_over_regset_sections |
| (gdbarch, armbsd_iterate_over_regset_sections); |
| |
| /* OpenBSD/arm uses -fpcc-struct-return by default. */ |
| tdep->struct_return = pcc_struct_return; |
| |
| /* Single stepping. */ |
| set_gdbarch_software_single_step (gdbarch, arm_software_single_step); |
| |
| /* Breakpoints. */ |
| switch (info.byte_order) |
| { |
| case BFD_ENDIAN_BIG: |
| tdep->thumb_breakpoint = arm_obsd_thumb_be_breakpoint; |
| tdep->thumb_breakpoint_size = sizeof (arm_obsd_thumb_be_breakpoint); |
| break; |
| |
| case BFD_ENDIAN_LITTLE: |
| tdep->thumb_breakpoint = arm_obsd_thumb_le_breakpoint; |
| tdep->thumb_breakpoint_size = sizeof (arm_obsd_thumb_le_breakpoint); |
| break; |
| } |
| } |
| |
| void _initialize_armobsd_tdep (); |
| void |
| _initialize_armobsd_tdep () |
| { |
| gdbarch_register_osabi (bfd_arch_arm, 0, GDB_OSABI_OPENBSD, |
| armobsd_init_abi); |
| } |