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[/] [openrisc/] [trunk/] [gnu-src/] [gdb-7.1/] [gdb/] [armobsd-tdep.c] - Rev 227
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/* Target-dependent code for OpenBSD/arm. Copyright (C) 2006, 2007, 2008, 2009, 2010 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 "gdb_string.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 char arm_obsd_thumb_le_breakpoint[] = {0xfe, 0xdf}; static const char 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_regset_from_core_section (gdbarch, armbsd_regset_from_core_section); /* 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); }