| /* Target-dependent code for FreeBSD/Alpha. |
| Copyright 2001, 2002, 2003 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 2 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, write to the Free Software |
| Foundation, Inc., 59 Temple Place - Suite 330, |
| Boston, MA 02111-1307, USA. */ |
| |
| #include "defs.h" |
| #include "value.h" |
| #include "osabi.h" |
| |
| #include "alpha-tdep.h" |
| |
| static int |
| alphafbsd_use_struct_convention (int gcc_p, struct type *type) |
| { |
| enum type_code code; |
| int i; |
| |
| /* All aggregate types that won't fit in a register must be returned |
| in memory. */ |
| if (TYPE_LENGTH (type) > ALPHA_REGISTER_SIZE) |
| return 1; |
| |
| /* The only aggregate types that can be returned in a register are |
| structs and unions. Arrays must be returned in memory. */ |
| code = TYPE_CODE (type); |
| if (code != TYPE_CODE_STRUCT && code != TYPE_CODE_UNION) |
| return 1; |
| |
| /* We need to check if this struct/union is "integer" like. For |
| this to be true, the offset of each adressable subfield must be |
| zero. Note that bit fields are not addressable. */ |
| for (i = 0; i < TYPE_NFIELDS (type); i++) |
| { |
| /* If the field bitsize is non-zero, it isn't adressable. */ |
| if (TYPE_FIELD_BITPOS (type, i) != 0 |
| && TYPE_FIELD_BITSIZE (type, i) == 0) |
| return 1; |
| } |
| |
| return 0; |
| } |
| |
| |
| /* Support for signal handlers. */ |
| |
| /* Return whether PC is in a BSD sigtramp routine. */ |
| |
| CORE_ADDR alphafbsd_sigtramp_start = 0x11ffff68; |
| CORE_ADDR alphafbsd_sigtramp_end = 0x11ffffe0; |
| |
| static int |
| alphafbsd_pc_in_sigtramp (CORE_ADDR pc, char *func_name) |
| { |
| return (pc >= alphafbsd_sigtramp_start && pc < alphafbsd_sigtramp_end); |
| } |
| |
| static LONGEST |
| alphafbsd_sigtramp_offset (CORE_ADDR pc) |
| { |
| return pc - alphafbsd_sigtramp_start; |
| } |
| |
| /* Assuming NEXT_FRAME is for a frame following a BSD sigtramp |
| routine, return the address of the associated sigcontext structure. */ |
| |
| static CORE_ADDR |
| alphafbsd_sigcontext_addr (struct frame_info *next_frame) |
| { |
| return frame_unwind_register_unsigned (next_frame, ALPHA_SP_REGNUM) + 24; |
| } |
| |
| /* FreeBSD 5.0-RELEASE or later. */ |
| |
| static void |
| alphafbsd_init_abi (struct gdbarch_info info, |
| struct gdbarch *gdbarch) |
| { |
| struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch); |
| |
| /* Hook into the DWARF CFI frame unwinder. */ |
| alpha_dwarf2_init_abi (info, gdbarch); |
| |
| /* Hook into the MDEBUG frame unwinder. */ |
| alpha_mdebug_init_abi (info, gdbarch); |
| |
| set_gdbarch_use_struct_convention (gdbarch, alphafbsd_use_struct_convention); |
| |
| set_gdbarch_pc_in_sigtramp (gdbarch, alphafbsd_pc_in_sigtramp); |
| |
| tdep->dynamic_sigtramp_offset = alphafbsd_sigtramp_offset; |
| tdep->sigcontext_addr = alphafbsd_sigcontext_addr; |
| tdep->sc_pc_offset = 288; |
| tdep->sc_regs_offset = 24; |
| tdep->sc_fpregs_offset = 320; |
| |
| tdep->jb_pc = 2; |
| tdep->jb_elt_size = 8; |
| } |
| |
| |
| /* Provide a prototype to silence -Wmissing-prototypes. */ |
| void _initialize_alphafbsd_tdep (void); |
| |
| void |
| _initialize_alphafbsd_tdep (void) |
| { |
| gdbarch_register_osabi (bfd_arch_alpha, 0, GDB_OSABI_FREEBSD_ELF, |
| alphafbsd_init_abi); |
| } |