sparc64-fbsd-tdep.c revision 1.1.1.1 
1/* Target-dependent code for FreeBSD/sparc64.
2
3   Copyright (C) 2003-2017 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 3 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, see <http://www.gnu.org/licenses/>.  */
19
20#include "defs.h"
21#include "frame.h"
22#include "frame-unwind.h"
23#include "gdbcore.h"
24#include "osabi.h"
25#include "regcache.h"
26#include "regset.h"
27#include "target.h"
28#include "trad-frame.h"
29
30#include "sparc64-tdep.h"
31#include "fbsd-tdep.h"
32#include "solib-svr4.h"
33
34/* From <machine/reg.h>.  */
35const struct sparc_gregmap sparc64fbsd_gregmap =
36{
37  26 * 8,			/* "tstate" */
38  25 * 8,			/* %pc */
39  24 * 8,			/* %npc */
40  28 * 8,			/* %y */
41  16 * 8,			/* %fprs */
42  -1,
43  1 * 8,			/* %g1 */
44  -1,				/* %l0 */
45  8				/* sizeof (%y) */
46};
47
48
49static void
50sparc64fbsd_supply_gregset (const struct regset *regset,
51			    struct regcache *regcache,
52			    int regnum, const void *gregs, size_t len)
53{
54  sparc64_supply_gregset (&sparc64fbsd_gregmap, regcache, regnum, gregs);
55}
56
57static void
58sparc64fbsd_collect_gregset (const struct regset *regset,
59			     const struct regcache *regcache,
60			     int regnum, void *gregs, size_t len)
61{
62  sparc64_collect_gregset (&sparc64fbsd_gregmap, regcache, regnum, gregs);
63}
64
65static void
66sparc64fbsd_supply_fpregset (const struct regset *regset,
67			     struct regcache *regcache,
68			     int regnum, const void *fpregs, size_t len)
69{
70  sparc64_supply_fpregset (&sparc64_bsd_fpregmap, regcache, regnum, fpregs);
71}
72
73static void
74sparc64fbsd_collect_fpregset (const struct regset *regset,
75			      const struct regcache *regcache,
76			      int regnum, void *fpregs, size_t len)
77{
78  sparc64_collect_fpregset (&sparc64_bsd_fpregmap, regcache, regnum, fpregs);
79}
80
81
82/* Signal trampolines.  */
83
84static int
85sparc64fbsd_pc_in_sigtramp (CORE_ADDR pc, const char *name)
86{
87  return (name && strcmp (name, "__sigtramp") == 0);
88}
89
90static struct sparc_frame_cache *
91sparc64fbsd_sigtramp_frame_cache (struct frame_info *this_frame,
92				   void **this_cache)
93{
94  struct sparc_frame_cache *cache;
95  CORE_ADDR addr, mcontext_addr, sp;
96  LONGEST fprs;
97  int regnum;
98
99  if (*this_cache)
100    return (struct sparc_frame_cache *) *this_cache;
101
102  cache = sparc_frame_cache (this_frame, this_cache);
103  gdb_assert (cache == *this_cache);
104
105  cache->saved_regs = trad_frame_alloc_saved_regs (this_frame);
106
107  /* The third argument is a pointer to an instance of `ucontext_t',
108     which has a member `uc_mcontext' that contains the saved
109     registers.  */
110  addr = get_frame_register_unsigned (this_frame, SPARC_O2_REGNUM);
111  mcontext_addr = addr + 64;
112
113  /* The following registers travel in the `mc_local' slots of
114     `mcontext_t'.  */
115  addr = mcontext_addr + 16 * 8;
116  cache->saved_regs[SPARC64_FPRS_REGNUM].addr = addr + 0 * 8;
117  cache->saved_regs[SPARC64_FSR_REGNUM].addr = addr + 1 * 8;
118
119  /* The following registers travel in the `mc_in' slots of
120     `mcontext_t'.  */
121  addr = mcontext_addr + 24 * 8;
122  cache->saved_regs[SPARC64_NPC_REGNUM].addr = addr + 0 * 8;
123  cache->saved_regs[SPARC64_PC_REGNUM].addr = addr + 1 * 8;
124  cache->saved_regs[SPARC64_STATE_REGNUM].addr = addr + 2 * 8;
125  cache->saved_regs[SPARC64_Y_REGNUM].addr = addr + 4 * 8;
126
127  /* The `global' and `out' registers travel in the `mc_global' and
128     `mc_out' slots of `mcontext_t', except for %g0.  Since %g0 is
129     always zero, keep the identity encoding.  */
130  for (regnum = SPARC_G1_REGNUM, addr = mcontext_addr + 8;
131       regnum <= SPARC_O7_REGNUM; regnum++, addr += 8)
132    cache->saved_regs[regnum].addr = addr;
133
134  /* The `local' and `in' registers have been saved in the register
135     save area.  */
136  addr = cache->saved_regs[SPARC_SP_REGNUM].addr;
137  sp = get_frame_memory_unsigned (this_frame, addr, 8);
138  for (regnum = SPARC_L0_REGNUM, addr = sp + BIAS;
139       regnum <= SPARC_I7_REGNUM; regnum++, addr += 8)
140    cache->saved_regs[regnum].addr = addr;
141
142  /* The floating-point registers are only saved if the FEF bit in
143     %fprs has been set.  */
144
145#define FPRS_FEF	(1 << 2)
146
147  addr = cache->saved_regs[SPARC64_FPRS_REGNUM].addr;
148  fprs = get_frame_memory_unsigned (this_frame, addr, 8);
149  if (fprs & FPRS_FEF)
150    {
151      for (regnum = SPARC_F0_REGNUM, addr = mcontext_addr + 32 * 8;
152	   regnum <= SPARC_F31_REGNUM; regnum++, addr += 4)
153	cache->saved_regs[regnum].addr = addr;
154
155      for (regnum = SPARC64_F32_REGNUM;
156	   regnum <= SPARC64_F62_REGNUM; regnum++, addr += 8)
157	cache->saved_regs[regnum].addr = addr;
158    }
159
160  return cache;
161}
162
163static void
164sparc64fbsd_sigtramp_frame_this_id (struct frame_info *this_frame,
165				    void **this_cache,
166				    struct frame_id *this_id)
167{
168  struct sparc_frame_cache *cache =
169    sparc64fbsd_sigtramp_frame_cache (this_frame, this_cache);
170
171  (*this_id) = frame_id_build (cache->base, cache->pc);
172}
173
174static struct value *
175sparc64fbsd_sigtramp_frame_prev_register (struct frame_info *this_frame,
176					  void **this_cache, int regnum)
177{
178  struct sparc_frame_cache *cache =
179    sparc64fbsd_sigtramp_frame_cache (this_frame, this_cache);
180
181  return trad_frame_get_prev_register (this_frame, cache->saved_regs, regnum);
182}
183
184static int
185sparc64fbsd_sigtramp_frame_sniffer (const struct frame_unwind *self,
186				    struct frame_info *this_frame,
187				    void **this_cache)
188{
189  CORE_ADDR pc = get_frame_pc (this_frame);
190  const char *name;
191
192  find_pc_partial_function (pc, &name, NULL, NULL);
193  if (sparc64fbsd_pc_in_sigtramp (pc, name))
194    return 1;
195
196  return 0;
197}
198
199static const struct frame_unwind sparc64fbsd_sigtramp_frame_unwind =
200{
201  SIGTRAMP_FRAME,
202  default_frame_unwind_stop_reason,
203  sparc64fbsd_sigtramp_frame_this_id,
204  sparc64fbsd_sigtramp_frame_prev_register,
205  NULL,
206  sparc64fbsd_sigtramp_frame_sniffer
207};
208
209
210static const struct regset sparc64fbsd_gregset =
211  {
212    NULL, sparc64fbsd_supply_gregset, sparc64fbsd_collect_gregset
213  };
214
215static const struct regset sparc64fbsd_fpregset =
216  {
217    NULL, sparc64fbsd_supply_fpregset, sparc64fbsd_collect_fpregset
218  };
219
220static void
221sparc64fbsd_init_abi (struct gdbarch_info info, struct gdbarch *gdbarch)
222{
223  struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch);
224
225  /* Generic FreeBSD support. */
226  fbsd_init_abi (info, gdbarch);
227
228  tdep->gregset = &sparc64fbsd_gregset;
229  tdep->sizeof_gregset = 256;
230
231  tdep->fpregset = &sparc64fbsd_fpregset;
232  tdep->sizeof_fpregset = 272;
233
234  frame_unwind_append_unwinder (gdbarch, &sparc64fbsd_sigtramp_frame_unwind);
235
236  sparc64_init_abi (info, gdbarch);
237
238  /* FreeBSD/sparc64 has SVR4-style shared libraries.  */
239  set_gdbarch_skip_trampoline_code (gdbarch, find_solib_trampoline_target);
240  set_solib_svr4_fetch_link_map_offsets
241    (gdbarch, svr4_lp64_fetch_link_map_offsets);
242}
243
244/* Provide a prototype to silence -Wmissing-prototypes.  */
245void _initialize_sparc64fbsd_tdep (void);
246
247void
248_initialize_sparc64fbsd_tdep (void)
249{
250  gdbarch_register_osabi (bfd_arch_sparc, bfd_mach_sparc_v9,
251			  GDB_OSABI_FREEBSD, sparc64fbsd_init_abi);
252}
253