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- /* Target-dependent code for OpenBSD/arm.
- Copyright (C) 2006-2022 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 "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,
- struct frame_info *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 = (arm_gdbarch_tdep *) 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);
- }
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