1 /* Target-dependent code for NetBSD/i386.
3 Copyright (C) 1988-2014 Free Software Foundation, Inc.
5 This file is part of GDB.
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 3 of the License, or
10 (at your option) any later version.
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.
17 You should have received a copy of the GNU General Public License
18 along with this program. If not, see <http://www.gnu.org/licenses/>. */
21 #include "arch-utils.h"
28 #include "trad-frame.h"
29 #include "tramp-frame.h"
33 #include "i386-tdep.h"
34 #include "i387-tdep.h"
35 #include "nbsd-tdep.h"
36 #include "solib-svr4.h"
38 /* From <machine/reg.h>. */
39 static int i386nbsd_r_reg_offset[] =
59 /* From <machine/signal.h>. */
60 int i386nbsd_sc_reg_offset[] =
80 /* From <machine/mcontext.h>. */
81 int i386nbsd_mc_reg_offset[] =
101 static void i386nbsd_sigtramp_cache_init (const struct tramp_frame *,
103 struct trad_frame_cache *,
106 static const struct tramp_frame i386nbsd_sigtramp_sc16 =
111 { 0x8d, -1 }, { 0x44, -1 }, { 0x24, -1 }, { 0x10, -1 },
112 /* leal 0x10(%esp), %eax */
113 { 0x50, -1 }, /* pushl %eax */
114 { 0x50, -1 }, /* pushl %eax */
115 { 0xb8, -1 }, { 0x27, -1 }, {0x01, -1 }, {0x00, -1 }, {0x00, -1 },
116 /* movl $0x127, %eax # __sigreturn14 */
117 { 0xcd, -1 }, { 0x80, -1},
119 { 0xb8, -1 }, { 0x01, -1 }, {0x00, -1 }, {0x00, -1 }, {0x00, -1 },
120 /* movl $0x1, %eax # exit */
121 { 0xcd, -1 }, { 0x80, -1},
123 { TRAMP_SENTINEL_INSN, -1 }
125 i386nbsd_sigtramp_cache_init
128 static const struct tramp_frame i386nbsd_sigtramp_sc2 =
133 { 0x8d, -1 }, { 0x44, -1 }, { 0x24, -1 }, { 0x0c, -1 },
134 /* leal 0x0c(%esp), %eax */
135 { 0x89, -1 }, { 0x44, -1 }, { 0x24, -1 }, { 0x04, -1 },
136 /* movl %eax, 0x4(%esp) */
137 { 0xb8, -1 }, { 0x27, -1 }, {0x01, -1 }, {0x00, -1 }, {0x00, -1 },
138 /* movl $0x127, %eax # __sigreturn14 */
139 { 0xcd, -1 }, { 0x80, -1},
141 { 0x89, -1 }, { 0x44, -1 }, { 0x24, -1 }, { 0x04, -1 },
142 /* movl %eax, 0x4(%esp) */
143 { 0xb8, -1 }, { 0x01, -1 }, {0x00, -1 }, {0x00, -1 }, {0x00, -1 },
144 /* movl $0x1, %eax */
145 { 0xcd, -1 }, { 0x80, -1},
147 { TRAMP_SENTINEL_INSN, -1 }
149 i386nbsd_sigtramp_cache_init
152 static const struct tramp_frame i386nbsd_sigtramp_si2 =
157 { 0x8b, -1 }, { 0x44, -1 }, { 0x24, -1 }, { 0x08, -1 },
158 /* movl 8(%esp),%eax */
159 { 0x89, -1 }, { 0x44, -1 }, { 0x24, -1 }, { 0x04, -1 },
160 /* movl %eax, 0x4(%esp) */
161 { 0xb8, -1 }, { 0x34, -1 }, { 0x01, -1 }, { 0x00, -1 }, { 0x00, -1 },
162 /* movl $0x134, %eax # setcontext */
163 { 0xcd, -1 }, { 0x80, -1 },
165 { 0x89, -1 }, { 0x44, -1 }, { 0x24, -1 }, { 0x04, -1 },
166 /* movl %eax, 0x4(%esp) */
167 { 0xb8, -1 }, { 0x01, -1 }, { 0x00, -1 }, { 0x00, -1 }, { 0x00, -1 },
168 /* movl $0x1, %eax */
169 { 0xcd, -1 }, { 0x80, -1 },
171 { TRAMP_SENTINEL_INSN, -1 }
173 i386nbsd_sigtramp_cache_init
176 static const struct tramp_frame i386nbsd_sigtramp_si31 =
181 { 0x8d, -1 }, { 0x84, -1 }, { 0x24, -1 },
182 { 0x8c, -1 }, { 0x00, -1 }, { 0x00, -1 }, { 0x00, -1 },
183 /* leal 0x8c(%esp), %eax */
184 { 0x89, -1 }, { 0x44, -1 }, { 0x24, -1 }, { 0x04, -1 },
185 /* movl %eax, 0x4(%esp) */
186 { 0xb8, -1 }, { 0x34, -1 }, { 0x01, -1 }, { 0x00, -1 }, { 0x00, -1 },
187 /* movl $0x134, %eax # setcontext */
188 { 0xcd, -1 }, { 0x80, -1},
190 { 0x89, -1 }, { 0x44, -1 }, { 0x24, -1 }, { 0x04, -1 },
191 /* movl %eax, 0x4(%esp) */
192 { 0xb8, -1 }, { 0x01, -1 }, {0x00, -1 }, {0x00, -1 }, {0x00, -1 },
193 /* movl $0x1, %eax */
194 { 0xcd, -1 }, { 0x80, -1},
196 { TRAMP_SENTINEL_INSN, -1 }
198 i386nbsd_sigtramp_cache_init
201 static const struct tramp_frame i386nbsd_sigtramp_si4 =
206 { 0x8d, -1 }, { 0x84, -1 }, { 0x24, -1 },
207 { 0x8c, -1 }, { 0x00, -1 }, { 0x00, -1 }, { 0x00, -1 },
208 /* leal 0x8c(%esp), %eax */
209 { 0x89, -1 }, { 0x44, -1 }, { 0x24, -1 }, { 0x04, -1 },
210 /* movl %eax, 0x4(%esp) */
211 { 0xb8, -1 }, { 0x34, -1 }, { 0x01, -1 }, { 0x00, -1 }, { 0x00, -1 },
212 /* movl $0x134, %eax # setcontext */
213 { 0xcd, -1 }, { 0x80, -1},
215 { 0xc7, -1 }, { 0x44, -1 }, { 0x24, -1 }, { 0x04, -1 },
216 { 0xff, -1 }, { 0xff, -1 }, { 0xff, -1 }, { 0xff, -1 },
217 /* movl $0xffffffff,0x4(%esp) */
218 { 0xb8, -1 }, { 0x01, -1 }, {0x00, -1 }, {0x00, -1 }, {0x00, -1 },
219 /* movl $0x1, %eax */
220 { 0xcd, -1 }, { 0x80, -1},
222 { TRAMP_SENTINEL_INSN, -1 }
224 i386nbsd_sigtramp_cache_init
228 i386nbsd_sigtramp_cache_init (const struct tramp_frame *self,
229 struct frame_info *this_frame,
230 struct trad_frame_cache *this_cache,
233 struct gdbarch *gdbarch = get_frame_arch (this_frame);
234 struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch);
235 enum bfd_endian byte_order = gdbarch_byte_order (gdbarch);
236 CORE_ADDR sp = get_frame_register_unsigned (this_frame, I386_ESP_REGNUM);
242 if (self == &i386nbsd_sigtramp_sc16 || self == &i386nbsd_sigtramp_sc2)
244 reg_offset = i386nbsd_sc_reg_offset;
245 num_regs = ARRAY_SIZE (i386nbsd_sc_reg_offset);
247 /* Read in the sigcontext address. */
248 base = read_memory_unsigned_integer (sp + 8, 4, byte_order);
252 reg_offset = i386nbsd_mc_reg_offset;
253 num_regs = ARRAY_SIZE (i386nbsd_mc_reg_offset);
255 /* Read in the ucontext address. */
256 base = read_memory_unsigned_integer (sp + 8, 4, byte_order);
257 /* offsetof(ucontext_t, uc_mcontext) == 36 */
261 for (i = 0; i < num_regs; i++)
262 if (reg_offset[i] != -1)
263 trad_frame_set_reg_addr (this_cache, i, base + reg_offset[i]);
265 /* Construct the frame ID using the function start. */
266 trad_frame_set_id (this_cache, frame_id_build (sp, func));
271 i386nbsd_init_abi (struct gdbarch_info info, struct gdbarch *gdbarch)
273 struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch);
275 /* Obviously NetBSD is BSD-based. */
276 i386bsd_init_abi (info, gdbarch);
278 /* NetBSD has a different `struct reg'. */
279 tdep->gregset_reg_offset = i386nbsd_r_reg_offset;
280 tdep->gregset_num_regs = ARRAY_SIZE (i386nbsd_r_reg_offset);
281 tdep->sizeof_gregset = 16 * 4;
283 /* NetBSD uses -freg-struct-return by default. */
284 tdep->struct_return = reg_struct_return;
286 /* NetBSD uses tramp_frame sniffers for signal trampolines. */
287 tdep->sigcontext_addr= 0;
288 tdep->sigtramp_start = 0;
289 tdep->sigtramp_end = 0;
290 tdep->sigtramp_p = 0;
291 tdep->sc_reg_offset = 0;
292 tdep->sc_num_regs = 0;
294 tramp_frame_prepend_unwinder (gdbarch, &i386nbsd_sigtramp_sc16);
295 tramp_frame_prepend_unwinder (gdbarch, &i386nbsd_sigtramp_sc2);
296 tramp_frame_prepend_unwinder (gdbarch, &i386nbsd_sigtramp_si2);
297 tramp_frame_prepend_unwinder (gdbarch, &i386nbsd_sigtramp_si31);
298 tramp_frame_prepend_unwinder (gdbarch, &i386nbsd_sigtramp_si4);
304 i386nbsdelf_init_abi (struct gdbarch_info info, struct gdbarch *gdbarch)
306 struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch);
308 /* It's still NetBSD. */
309 i386nbsd_init_abi (info, gdbarch);
312 i386_elf_init_abi (info, gdbarch);
314 /* NetBSD ELF uses SVR4-style shared libraries. */
315 set_solib_svr4_fetch_link_map_offsets
316 (gdbarch, svr4_ilp32_fetch_link_map_offsets);
318 /* NetBSD ELF uses -fpcc-struct-return by default. */
319 tdep->struct_return = pcc_struct_return;
322 /* Provide a prototype to silence -Wmissing-prototypes. */
323 extern initialize_file_ftype _initialize_i386nbsd_tdep;
326 _initialize_i386nbsd_tdep (void)
328 gdbarch_register_osabi (bfd_arch_i386, 0, GDB_OSABI_NETBSD_ELF,
329 i386nbsdelf_init_abi);