179971Sobrien/* Target-dependent code for FreeBSD/Alpha. 279971Sobrien Copyright 2001, 2002, 2003 Free Software Foundation, Inc. 379971Sobrien 479971Sobrien This file is part of GDB. 579971Sobrien 679971Sobrien This program is free software; you can redistribute it and/or modify 779971Sobrien it under the terms of the GNU General Public License as published by 879971Sobrien the Free Software Foundation; either version 2 of the License, or 979971Sobrien (at your option) any later version. 1079971Sobrien 1179971Sobrien This program is distributed in the hope that it will be useful, 1279971Sobrien but WITHOUT ANY WARRANTY; without even the implied warranty of 1379971Sobrien MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 1479971Sobrien GNU General Public License for more details. 1579971Sobrien 1679971Sobrien You should have received a copy of the GNU General Public License 1779971Sobrien along with this program; if not, write to the Free Software 1879971Sobrien Foundation, Inc., 59 Temple Place - Suite 330, 1979971Sobrien Boston, MA 02111-1307, USA. */ 2079971Sobrien 2179971Sobrien#include "defs.h" 2279971Sobrien#include "value.h" 2379971Sobrien#include "osabi.h" 2479971Sobrien 2579971Sobrien#include "alpha-tdep.h" 2679971Sobrien 2779971Sobrienstatic int 2879971Sobrienalphafbsd_use_struct_convention (int gcc_p, struct type *type) 2979971Sobrien{ 3079971Sobrien enum type_code code; 3179971Sobrien int i; 3279971Sobrien 3379971Sobrien /* All aggregate types that won't fit in a register must be returned 3479971Sobrien in memory. */ 3579971Sobrien if (TYPE_LENGTH (type) > ALPHA_REGISTER_SIZE) 3679971Sobrien return 1; 3779971Sobrien 3879971Sobrien /* The only aggregate types that can be returned in a register are 3979971Sobrien structs and unions. Arrays must be returned in memory. */ 4079971Sobrien code = TYPE_CODE (type); 4179971Sobrien if (code != TYPE_CODE_STRUCT && code != TYPE_CODE_UNION) 4279971Sobrien return 1; 4379971Sobrien 4479971Sobrien /* We need to check if this struct/union is "integer" like. For 4579971Sobrien this to be true, the offset of each adressable subfield must be 4679971Sobrien zero. Note that bit fields are not addressable. */ 4779971Sobrien for (i = 0; i < TYPE_NFIELDS (type); i++) 4879971Sobrien { 4979971Sobrien /* If the field bitsize is non-zero, it isn't adressable. */ 5079971Sobrien if (TYPE_FIELD_BITPOS (type, i) != 0 5179971Sobrien && TYPE_FIELD_BITSIZE (type, i) == 0) 5279971Sobrien return 1; 5379971Sobrien } 5479971Sobrien 5579971Sobrien return 0; 5679971Sobrien} 5779971Sobrien 5879971Sobrien 5979971Sobrien/* Support for signal handlers. */ 6079971Sobrien 6179971Sobrien/* Return whether PC is in a BSD sigtramp routine. */ 6279971Sobrien 6379971SobrienCORE_ADDR alphafbsd_sigtramp_start = 0x11ffff68; 6479971SobrienCORE_ADDR alphafbsd_sigtramp_end = 0x11ffffe0; 6579971Sobrien 6679971Sobrienstatic int 6779971Sobrienalphafbsd_pc_in_sigtramp (CORE_ADDR pc, char *func_name) 6879971Sobrien{ 6979971Sobrien return (pc >= alphafbsd_sigtramp_start && pc < alphafbsd_sigtramp_end); 7079971Sobrien} 7179971Sobrien 7279971Sobrienstatic LONGEST 7379971Sobrienalphafbsd_sigtramp_offset (CORE_ADDR pc) 7479971Sobrien{ 7579971Sobrien return pc - alphafbsd_sigtramp_start; 7679971Sobrien} 7779971Sobrien 7879971Sobrien/* Assuming NEXT_FRAME is for a frame following a BSD sigtramp 7979971Sobrien routine, return the address of the associated sigcontext structure. */ 8079971Sobrien 8179971Sobrienstatic CORE_ADDR 8279971Sobrienalphafbsd_sigcontext_addr (struct frame_info *next_frame) 8379971Sobrien{ 8479971Sobrien return frame_unwind_register_unsigned (next_frame, ALPHA_SP_REGNUM) + 24; 8579971Sobrien} 8679971Sobrien 8779971Sobrien/* FreeBSD 5.0-RELEASE or later. */ 8879971Sobrien 8979971Sobrienstatic void 9079971Sobrienalphafbsd_init_abi (struct gdbarch_info info, 9179971Sobrien struct gdbarch *gdbarch) 9279971Sobrien{ 9379971Sobrien struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch); 9479971Sobrien 9579971Sobrien /* Hook into the DWARF CFI frame unwinder. */ 9679971Sobrien alpha_dwarf2_init_abi (info, gdbarch); 9779971Sobrien 9879971Sobrien /* Hook into the MDEBUG frame unwinder. */ 9979971Sobrien alpha_mdebug_init_abi (info, gdbarch); 10079971Sobrien 10179971Sobrien set_gdbarch_use_struct_convention (gdbarch, alphafbsd_use_struct_convention); 10279971Sobrien 10379971Sobrien set_gdbarch_pc_in_sigtramp (gdbarch, alphafbsd_pc_in_sigtramp); 10479971Sobrien 10579971Sobrien tdep->dynamic_sigtramp_offset = alphafbsd_sigtramp_offset; 10679971Sobrien tdep->sigcontext_addr = alphafbsd_sigcontext_addr; 10779971Sobrien tdep->sc_pc_offset = 288; 10879971Sobrien tdep->sc_regs_offset = 24; 10979971Sobrien tdep->sc_fpregs_offset = 320; 11079971Sobrien 11179971Sobrien tdep->jb_pc = 2; 11279971Sobrien tdep->jb_elt_size = 8; 11379971Sobrien} 11479971Sobrien 11579971Sobrien 11679971Sobrien/* Provide a prototype to silence -Wmissing-prototypes. */ 11779971Sobrienvoid _initialize_alphafbsd_tdep (void); 11879971Sobrien 11979971Sobrienvoid 12079971Sobrien_initialize_alphafbsd_tdep (void) 12179971Sobrien{ 12279971Sobrien gdbarch_register_osabi (bfd_arch_alpha, 0, GDB_OSABI_FREEBSD_ELF, 12379971Sobrien alphafbsd_init_abi); 12479971Sobrien} 12579971Sobrien