| 1 | /* Target-dependent code for FreeBSD/alpha. |
| 2 | |
| 3 | Copyright (C) 2001, 2002, 2003, 2006 Free Software Foundation, Inc. |
| 4 | |
| 5 | This file is part of GDB. |
| 6 | |
| 7 | This program is free software; you can redistribute it and/or modify |
| 8 | it under the terms of the GNU General Public License as published by |
| 9 | the Free Software Foundation; either version 2 of the License, or |
| 10 | (at your option) any later version. |
| 11 | |
| 12 | This program is distributed in the hope that it will be useful, |
| 13 | but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 14 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 15 | GNU General Public License for more details. |
| 16 | |
| 17 | You should have received a copy of the GNU General Public License |
| 18 | along with this program; if not, write to the Free Software |
| 19 | Foundation, Inc., 51 Franklin Street, Fifth Floor, |
| 20 | Boston, MA 02110-1301, USA. */ |
| 21 | |
| 22 | #include "defs.h" |
| 23 | #include "value.h" |
| 24 | #include "osabi.h" |
| 25 | |
| 26 | #include "alpha-tdep.h" |
| 27 | #include "solib-svr4.h" |
| 28 | |
| 29 | static int |
| 30 | alphafbsd_use_struct_convention (int gcc_p, struct type *type) |
| 31 | { |
| 32 | enum type_code code; |
| 33 | int i; |
| 34 | |
| 35 | /* All aggregate types that won't fit in a register must be returned |
| 36 | in memory. */ |
| 37 | if (TYPE_LENGTH (type) > ALPHA_REGISTER_SIZE) |
| 38 | return 1; |
| 39 | |
| 40 | /* The only aggregate types that can be returned in a register are |
| 41 | structs and unions. Arrays must be returned in memory. */ |
| 42 | code = TYPE_CODE (type); |
| 43 | if (code != TYPE_CODE_STRUCT && code != TYPE_CODE_UNION) |
| 44 | return 1; |
| 45 | |
| 46 | /* We need to check if this struct/union is "integer" like. For |
| 47 | this to be true, the offset of each adressable subfield must be |
| 48 | zero. Note that bit fields are not addressable. */ |
| 49 | for (i = 0; i < TYPE_NFIELDS (type); i++) |
| 50 | { |
| 51 | /* If the field bitsize is non-zero, it isn't adressable. */ |
| 52 | if (TYPE_FIELD_BITPOS (type, i) != 0 |
| 53 | && TYPE_FIELD_BITSIZE (type, i) == 0) |
| 54 | return 1; |
| 55 | } |
| 56 | |
| 57 | return 0; |
| 58 | } |
| 59 | \f |
| 60 | |
| 61 | /* Support for signal handlers. */ |
| 62 | |
| 63 | /* Return whether PC is in a BSD sigtramp routine. */ |
| 64 | |
| 65 | CORE_ADDR alphafbsd_sigtramp_start = 0x11ffff68; |
| 66 | CORE_ADDR alphafbsd_sigtramp_end = 0x11ffffe0; |
| 67 | |
| 68 | static int |
| 69 | alphafbsd_pc_in_sigtramp (CORE_ADDR pc, char *func_name) |
| 70 | { |
| 71 | return (pc >= alphafbsd_sigtramp_start && pc < alphafbsd_sigtramp_end); |
| 72 | } |
| 73 | |
| 74 | static LONGEST |
| 75 | alphafbsd_sigtramp_offset (CORE_ADDR pc) |
| 76 | { |
| 77 | return pc - alphafbsd_sigtramp_start; |
| 78 | } |
| 79 | |
| 80 | /* Assuming NEXT_FRAME is for a frame following a BSD sigtramp |
| 81 | routine, return the address of the associated sigcontext structure. */ |
| 82 | |
| 83 | static CORE_ADDR |
| 84 | alphafbsd_sigcontext_addr (struct frame_info *next_frame) |
| 85 | { |
| 86 | return frame_unwind_register_unsigned (next_frame, ALPHA_SP_REGNUM) + 24; |
| 87 | } |
| 88 | |
| 89 | /* FreeBSD 5.0-RELEASE or later. */ |
| 90 | |
| 91 | static void |
| 92 | alphafbsd_init_abi (struct gdbarch_info info, |
| 93 | struct gdbarch *gdbarch) |
| 94 | { |
| 95 | struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch); |
| 96 | |
| 97 | /* Hook into the DWARF CFI frame unwinder. */ |
| 98 | alpha_dwarf2_init_abi (info, gdbarch); |
| 99 | |
| 100 | /* Hook into the MDEBUG frame unwinder. */ |
| 101 | alpha_mdebug_init_abi (info, gdbarch); |
| 102 | |
| 103 | /* FreeBSD/alpha has SVR4-style shared libraries. */ |
| 104 | set_solib_svr4_fetch_link_map_offsets |
| 105 | (gdbarch, svr4_lp64_fetch_link_map_offsets); |
| 106 | |
| 107 | set_gdbarch_deprecated_use_struct_convention |
| 108 | (gdbarch, alphafbsd_use_struct_convention); |
| 109 | |
| 110 | tdep->dynamic_sigtramp_offset = alphafbsd_sigtramp_offset; |
| 111 | tdep->sigcontext_addr = alphafbsd_sigcontext_addr; |
| 112 | tdep->pc_in_sigtramp = alphafbsd_pc_in_sigtramp; |
| 113 | tdep->sc_pc_offset = 288; |
| 114 | tdep->sc_regs_offset = 24; |
| 115 | tdep->sc_fpregs_offset = 320; |
| 116 | |
| 117 | tdep->jb_pc = 2; |
| 118 | tdep->jb_elt_size = 8; |
| 119 | } |
| 120 | \f |
| 121 | |
| 122 | /* Provide a prototype to silence -Wmissing-prototypes. */ |
| 123 | void _initialize_alphafbsd_tdep (void); |
| 124 | |
| 125 | void |
| 126 | _initialize_alphafbsd_tdep (void) |
| 127 | { |
| 128 | gdbarch_register_osabi (bfd_arch_alpha, 0, GDB_OSABI_FREEBSD_ELF, |
| 129 | alphafbsd_init_abi); |
| 130 | } |