diff options
Diffstat (limited to 'gdb/arm-obsd-tdep.c')
| -rw-r--r-- | gdb/arm-obsd-tdep.c | 140 |
1 files changed, 140 insertions, 0 deletions
diff --git a/gdb/arm-obsd-tdep.c b/gdb/arm-obsd-tdep.c new file mode 100644 index 0000000..5ccf1d1 --- /dev/null +++ b/gdb/arm-obsd-tdep.c @@ -0,0 +1,140 @@ +/* Target-dependent code for OpenBSD/arm. + + Copyright (C) 2006-2016 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, -1 }, /* add r0, sp, #16 */ + { 0xef000067, -1 }, /* swi SYS_sigreturn */ + { 0xef000001, -1 }, /* swi SYS_exit */ + { 0xeafffffc, -1 }, /* b . - 8 */ + { TRAMP_SENTINEL_INSN, -1 } + }, + 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) +{ + struct gdbarch_tdep *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; + } +} + + +static enum gdb_osabi +armobsd_core_osabi_sniffer (bfd *abfd) +{ + if (strcmp (bfd_get_target (abfd), "netbsd-core") == 0) + return GDB_OSABI_OPENBSD_ELF; + + return GDB_OSABI_UNKNOWN; +} + +/* Provide a prototype to silence -Wmissing-prototypes. */ +extern initialize_file_ftype _initialize_armobsd_tdep; + +void +_initialize_armobsd_tdep (void) +{ + /* BFD doesn't set a flavour for NetBSD style a.out core files. */ + gdbarch_register_osabi_sniffer (bfd_arch_arm, bfd_target_unknown_flavour, + armobsd_core_osabi_sniffer); + + gdbarch_register_osabi (bfd_arch_arm, 0, GDB_OSABI_OPENBSD_ELF, + armobsd_init_abi); +} |