1 /* Target-dependent code for i386 BSD's.
2 Copyright 2001, 2002 Free Software Foundation, Inc.
4 This file is part of GDB.
6 This program is free software; you can redistribute it and/or modify
7 it under the terms of the GNU General Public License as published by
8 the Free Software Foundation; either version 2 of the License, or
9 (at your option) any later version.
11 This program is distributed in the hope that it will be useful,
12 but WITHOUT ANY WARRANTY; without even the implied warranty of
13 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14 GNU General Public License for more details.
16 You should have received a copy of the GNU General Public License
17 along with this program; if not, write to the Free Software
18 Foundation, Inc., 59 Temple Place - Suite 330,
19 Boston, MA 02111-1307, USA. */
22 #include "arch-utils.h"
27 #include "i386-tdep.h"
29 /* Support for signal handlers. */
31 /* Return whether PC is in a BSD sigtramp routine. */
34 i386bsd_pc_in_sigtramp (CORE_ADDR pc, char *name)
36 struct gdbarch_tdep *tdep = gdbarch_tdep (current_gdbarch);
38 return (pc >= tdep->sigtramp_start && pc < tdep->sigtramp_end);
41 /* Assuming FRAME is for a BSD sigtramp routine, return the address of
42 the associated sigcontext structure. */
45 i386bsd_sigcontext_addr (struct frame_info *frame)
48 /* If this isn't the top frame, the next frame must be for the
49 signal handler itself. A pointer to the sigcontext structure
50 is passed as the third argument to the signal handler. */
51 return read_memory_unsigned_integer (frame->next->frame + 16, 4);
53 /* This is the top frame. We'll have to find the address of the
54 sigcontext structure by looking at the stack pointer. */
55 return read_memory_unsigned_integer (read_register (SP_REGNUM) + 8, 4);
58 /* Assuming FRAME is for a BSD sigtramp routine, return the saved
61 Note: This function is used for Solaris 2 too, so don't make it
65 i386bsd_sigtramp_saved_pc (struct frame_info *frame)
67 int sc_pc_offset = gdbarch_tdep (current_gdbarch)->sc_pc_offset;
70 addr = i386bsd_sigcontext_addr (frame);
71 return read_memory_unsigned_integer (addr + sc_pc_offset, 4);
74 /* Return the start address of the sigtramp routine. */
77 i386bsd_sigtramp_start (CORE_ADDR pc)
79 return gdbarch_tdep (current_gdbarch)->sigtramp_start;
82 /* Return the end address of the sigtramp routine. */
85 i386bsd_sigtramp_end (CORE_ADDR pc)
87 return gdbarch_tdep (current_gdbarch)->sigtramp_end;
91 /* Support for shared libraries. */
93 /* Return non-zero if we are in a shared library trampoline code stub. */
96 i386bsd_aout_in_solib_call_trampoline (CORE_ADDR pc, char *name)
98 return (name && !strcmp (name, "_DYNAMIC"));
101 /* Traditional BSD (4.3 BSD, still used for BSDI and 386BSD). */
103 /* From <machine/signal.h>. */
104 int i386bsd_sc_pc_offset = 20;
107 i386bsd_init_abi (struct gdbarch_info info, struct gdbarch *gdbarch)
109 struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch);
111 set_gdbarch_pc_in_sigtramp (gdbarch, i386bsd_pc_in_sigtramp);
113 /* Assume SunOS-style shared libraries. */
114 set_gdbarch_in_solib_call_trampoline (gdbarch,
115 i386bsd_aout_in_solib_call_trampoline);
117 tdep->jb_pc_offset = 0;
119 tdep->sigtramp_saved_pc = i386bsd_sigtramp_saved_pc;
120 tdep->sigtramp_start = 0xfdbfdfc0;
121 tdep->sigtramp_end = 0xfdbfe000;
122 tdep->sc_pc_offset = i386bsd_sc_pc_offset;
125 /* NetBSD 1.0 or later. */
127 /* From <machine/signal.h>. */
128 int i386nbsd_sc_pc_offset = 44;
131 i386nbsd_init_abi (struct gdbarch_info info, struct gdbarch *gdbarch)
133 struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch);
135 /* Obviously NetBSD is BSD-based. */
136 i386bsd_init_abi (info, gdbarch);
138 /* NetBSD uses -freg-struct-return by default. */
139 tdep->struct_return = reg_struct_return;
141 /* NetBSD uses a different memory layout. */
142 tdep->sigtramp_start = 0xbfbfdf20;
143 tdep->sigtramp_end = 0xbfbfdff0;
145 /* NetBSD has a `struct sigcontext' that's different from the
146 origional 4.3 BSD. */
147 tdep->sc_pc_offset = i386nbsd_sc_pc_offset;
152 i386nbsdelf_init_abi (struct gdbarch_info info, struct gdbarch *gdbarch)
154 struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch);
156 /* It's still NetBSD. */
157 i386nbsd_init_abi (info, gdbarch);
160 i386_elf_init_abi (info, gdbarch);
162 /* NetBSD ELF uses SVR4-style shared libraries. */
163 set_gdbarch_in_solib_call_trampoline (gdbarch,
164 generic_in_solib_call_trampoline);
166 /* NetBSD ELF uses -fpcc-struct-return by default. */
167 tdep->struct_return = pcc_struct_return;
169 /* We support the SSE registers on NetBSD ELF. */
170 tdep->num_xmm_regs = I386_NUM_XREGS - 1;
171 set_gdbarch_num_regs (gdbarch, I386_NUM_GREGS + I386_NUM_FREGS
175 /* FreeBSD 3.0-RELEASE or later. */
177 CORE_ADDR i386fbsd_sigtramp_start = 0xbfbfdf20;
178 CORE_ADDR i386fbsd_sigtramp_end = 0xbfbfdff0;
181 i386fbsdaout_init_abi (struct gdbarch_info info, struct gdbarch *gdbarch)
183 struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch);
185 /* Obviously FreeBSD is BSD-based. */
186 i386bsd_init_abi (info, gdbarch);
188 /* FreeBSD uses -freg-struct-return by default. */
189 tdep->struct_return = reg_struct_return;
191 /* FreeBSD uses a different memory layout. */
192 tdep->sigtramp_start = i386fbsd_sigtramp_start;
193 tdep->sigtramp_end = i386fbsd_sigtramp_end;
197 i386fbsd_init_abi (struct gdbarch_info info, struct gdbarch *gdbarch)
199 /* It's almost identical to FreeBSD a.out. */
200 i386fbsdaout_init_abi (info, gdbarch);
202 /* Except that it uses ELF. */
203 i386_elf_init_abi (info, gdbarch);
205 /* FreeBSD ELF uses SVR4-style shared libraries. */
206 set_gdbarch_in_solib_call_trampoline (gdbarch,
207 generic_in_solib_call_trampoline);
210 /* FreeBSD 4.0-RELEASE or later. */
212 /* From <machine/signal.h>. */
213 int i386fbsd4_sc_pc_offset = 76;
216 i386fbsd4_init_abi (struct gdbarch_info info, struct gdbarch *gdbarch)
218 struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch);
220 /* Inherit stuff from older releases. We assume that FreeBSD
221 4.0-RELEASE always uses ELF. */
222 i386fbsd_init_abi (info, gdbarch);
224 /* FreeBSD 4.0 introduced a new `struct sigcontext'. */
225 tdep->sc_pc_offset = i386fbsd4_sc_pc_offset;
229 static enum gdb_osabi
230 i386bsd_aout_osabi_sniffer (bfd *abfd)
232 if (strcmp (bfd_get_target (abfd), "a.out-i386-netbsd") == 0)
233 return GDB_OSABI_NETBSD_AOUT;
235 if (strcmp (bfd_get_target (abfd), "a.out-i386-freebsd") == 0)
236 return GDB_OSABI_FREEBSD_AOUT;
238 return GDB_OSABI_UNKNOWN;
242 /* Provide a prototype to silence -Wmissing-prototypes. */
243 void _initialize_i386bsd_tdep (void);
246 _initialize_i386bsd_tdep (void)
248 gdbarch_register_osabi_sniffer (bfd_arch_i386, bfd_target_aout_flavour,
249 i386bsd_aout_osabi_sniffer);
251 gdbarch_register_osabi (bfd_arch_i386, GDB_OSABI_NETBSD_AOUT,
253 gdbarch_register_osabi (bfd_arch_i386, GDB_OSABI_NETBSD_ELF,
254 i386nbsdelf_init_abi);
255 gdbarch_register_osabi (bfd_arch_i386, GDB_OSABI_FREEBSD_AOUT,
256 i386fbsdaout_init_abi);
257 gdbarch_register_osabi (bfd_arch_i386, GDB_OSABI_FREEBSD_ELF,