141 lines
4.1 KiB
C
141 lines
4.1 KiB
C
/* Target-dependent code for OpenBSD/arm.
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Copyright (C) 2006-2016 Free Software Foundation, Inc.
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This file is part of GDB.
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 3 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program. If not, see <http://www.gnu.org/licenses/>. */
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#include "defs.h"
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#include "osabi.h"
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#include "trad-frame.h"
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#include "tramp-frame.h"
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#include "obsd-tdep.h"
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#include "arm-tdep.h"
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#include "solib-svr4.h"
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/* Signal trampolines. */
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static void
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armobsd_sigframe_init (const struct tramp_frame *self,
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struct frame_info *this_frame,
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struct trad_frame_cache *cache,
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CORE_ADDR func)
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{
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CORE_ADDR sp, sigcontext_addr, addr;
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int regnum;
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/* We find the appropriate instance of `struct sigcontext' at a
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fixed offset in the signal frame. */
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sp = get_frame_register_signed (this_frame, ARM_SP_REGNUM);
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sigcontext_addr = sp + 16;
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/* PC. */
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trad_frame_set_reg_addr (cache, ARM_PC_REGNUM, sigcontext_addr + 76);
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/* GPRs. */
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for (regnum = ARM_A1_REGNUM, addr = sigcontext_addr + 12;
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regnum <= ARM_LR_REGNUM; regnum++, addr += 4)
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trad_frame_set_reg_addr (cache, regnum, addr);
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trad_frame_set_id (cache, frame_id_build (sp, func));
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}
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static const struct tramp_frame armobsd_sigframe =
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{
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SIGTRAMP_FRAME,
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4,
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{
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{ 0xe28d0010, -1 }, /* add r0, sp, #16 */
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{ 0xef000067, -1 }, /* swi SYS_sigreturn */
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{ 0xef000001, -1 }, /* swi SYS_exit */
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{ 0xeafffffc, -1 }, /* b . - 8 */
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{ TRAMP_SENTINEL_INSN, -1 }
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},
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armobsd_sigframe_init
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};
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/* Override default thumb breakpoints. */
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static const gdb_byte arm_obsd_thumb_le_breakpoint[] = {0xfe, 0xdf};
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static const gdb_byte arm_obsd_thumb_be_breakpoint[] = {0xdf, 0xfe};
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static void
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armobsd_init_abi (struct gdbarch_info info,
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struct gdbarch *gdbarch)
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{
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struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch);
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if (tdep->fp_model == ARM_FLOAT_AUTO)
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tdep->fp_model = ARM_FLOAT_SOFT_VFP;
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tramp_frame_prepend_unwinder (gdbarch, &armobsd_sigframe);
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/* OpenBSD/arm uses SVR4-style shared libraries. */
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set_solib_svr4_fetch_link_map_offsets
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(gdbarch, svr4_ilp32_fetch_link_map_offsets);
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set_gdbarch_skip_solib_resolver (gdbarch, obsd_skip_solib_resolver);
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tdep->jb_pc = 24;
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tdep->jb_elt_size = 4;
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set_gdbarch_iterate_over_regset_sections
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(gdbarch, armbsd_iterate_over_regset_sections);
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/* OpenBSD/arm uses -fpcc-struct-return by default. */
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tdep->struct_return = pcc_struct_return;
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/* Single stepping. */
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set_gdbarch_software_single_step (gdbarch, arm_software_single_step);
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/* Breakpoints. */
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switch (info.byte_order)
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{
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case BFD_ENDIAN_BIG:
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tdep->thumb_breakpoint = arm_obsd_thumb_be_breakpoint;
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tdep->thumb_breakpoint_size = sizeof (arm_obsd_thumb_be_breakpoint);
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break;
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case BFD_ENDIAN_LITTLE:
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tdep->thumb_breakpoint = arm_obsd_thumb_le_breakpoint;
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tdep->thumb_breakpoint_size = sizeof (arm_obsd_thumb_le_breakpoint);
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break;
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}
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}
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static enum gdb_osabi
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armobsd_core_osabi_sniffer (bfd *abfd)
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{
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if (strcmp (bfd_get_target (abfd), "netbsd-core") == 0)
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return GDB_OSABI_OPENBSD_ELF;
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return GDB_OSABI_UNKNOWN;
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}
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/* Provide a prototype to silence -Wmissing-prototypes. */
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extern initialize_file_ftype _initialize_armobsd_tdep;
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void
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_initialize_armobsd_tdep (void)
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{
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/* BFD doesn't set a flavour for NetBSD style a.out core files. */
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gdbarch_register_osabi_sniffer (bfd_arch_arm, bfd_target_unknown_flavour,
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armobsd_core_osabi_sniffer);
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gdbarch_register_osabi (bfd_arch_arm, 0, GDB_OSABI_OPENBSD_ELF,
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armobsd_init_abi);
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}
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