1/* Target-dependent code for FreeBSD/sparc64.
2
3   Copyright (C) 2003-2023 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#include "gdbarch.h"
34
35/* From <machine/reg.h>.  */
36const struct sparc_gregmap sparc64fbsd_gregmap =
37{
38  26 * 8,			/* "tstate" */
39  25 * 8,			/* %pc */
40  24 * 8,			/* %npc */
41  28 * 8,			/* %y */
42  16 * 8,			/* %fprs */
43  -1,
44  1 * 8,			/* %g1 */
45  -1,				/* %l0 */
46  8				/* sizeof (%y) */
47};
48
49
50static void
51sparc64fbsd_supply_gregset (const struct regset *regset,
52			    struct regcache *regcache,
53			    int regnum, const void *gregs, size_t len)
54{
55  sparc64_supply_gregset (&sparc64fbsd_gregmap, regcache, regnum, gregs);
56}
57
58static void
59sparc64fbsd_collect_gregset (const struct regset *regset,
60			     const struct regcache *regcache,
61			     int regnum, void *gregs, size_t len)
62{
63  sparc64_collect_gregset (&sparc64fbsd_gregmap, regcache, regnum, gregs);
64}
65
66static void
67sparc64fbsd_supply_fpregset (const struct regset *regset,
68			     struct regcache *regcache,
69			     int regnum, const void *fpregs, size_t len)
70{
71  sparc64_supply_fpregset (&sparc64_bsd_fpregmap, regcache, regnum, fpregs);
72}
73
74static void
75sparc64fbsd_collect_fpregset (const struct regset *regset,
76			      const struct regcache *regcache,
77			      int regnum, void *fpregs, size_t len)
78{
79  sparc64_collect_fpregset (&sparc64_bsd_fpregmap, regcache, regnum, fpregs);
80}
81
82
83/* Signal trampolines.  */
84
85static int
86sparc64fbsd_pc_in_sigtramp (CORE_ADDR pc, const char *name)
87{
88  return (name && strcmp (name, "__sigtramp") == 0);
89}
90
91static struct sparc_frame_cache *
92sparc64fbsd_sigtramp_frame_cache (frame_info_ptr this_frame,
93				   void **this_cache)
94{
95  struct sparc_frame_cache *cache;
96  CORE_ADDR addr, mcontext_addr, sp;
97  LONGEST fprs;
98  int regnum;
99
100  if (*this_cache)
101    return (struct sparc_frame_cache *) *this_cache;
102
103  cache = sparc_frame_cache (this_frame, this_cache);
104  gdb_assert (cache == *this_cache);
105
106  cache->saved_regs = trad_frame_alloc_saved_regs (this_frame);
107
108  /* The third argument is a pointer to an instance of `ucontext_t',
109     which has a member `uc_mcontext' that contains the saved
110     registers.  */
111  addr = get_frame_register_unsigned (this_frame, SPARC_O2_REGNUM);
112  mcontext_addr = addr + 64;
113
114  /* The following registers travel in the `mc_local' slots of
115     `mcontext_t'.  */
116  addr = mcontext_addr + 16 * 8;
117  cache->saved_regs[SPARC64_FPRS_REGNUM].set_addr (addr + 0 * 8);
118  cache->saved_regs[SPARC64_FSR_REGNUM].set_addr (addr + 1 * 8);
119
120  /* The following registers travel in the `mc_in' slots of
121     `mcontext_t'.  */
122  addr = mcontext_addr + 24 * 8;
123  cache->saved_regs[SPARC64_NPC_REGNUM].set_addr (addr + 0 * 8);
124  cache->saved_regs[SPARC64_PC_REGNUM].set_addr (addr + 1 * 8);
125  cache->saved_regs[SPARC64_STATE_REGNUM].set_addr (addr + 2 * 8);
126  cache->saved_regs[SPARC64_Y_REGNUM].set_addr (addr + 4 * 8);
127
128  /* The `global' and `out' registers travel in the `mc_global' and
129     `mc_out' slots of `mcontext_t', except for %g0.  Since %g0 is
130     always zero, keep the identity encoding.  */
131  for (regnum = SPARC_G1_REGNUM, addr = mcontext_addr + 8;
132       regnum <= SPARC_O7_REGNUM; regnum++, addr += 8)
133    cache->saved_regs[regnum].set_addr (addr);
134
135  /* The `local' and `in' registers have been saved in the register
136     save area.  */
137  addr = cache->saved_regs[SPARC_SP_REGNUM].addr ();
138  sp = get_frame_memory_unsigned (this_frame, addr, 8);
139  for (regnum = SPARC_L0_REGNUM, addr = sp + BIAS;
140       regnum <= SPARC_I7_REGNUM; regnum++, addr += 8)
141    cache->saved_regs[regnum].set_addr (addr);
142
143  /* The floating-point registers are only saved if the FEF bit in
144     %fprs has been set.  */
145
146#define FPRS_FEF	(1 << 2)
147
148  addr = cache->saved_regs[SPARC64_FPRS_REGNUM].addr ();
149  fprs = get_frame_memory_unsigned (this_frame, addr, 8);
150  if (fprs & FPRS_FEF)
151    {
152      for (regnum = SPARC_F0_REGNUM, addr = mcontext_addr + 32 * 8;
153	   regnum <= SPARC_F31_REGNUM; regnum++, addr += 4)
154	cache->saved_regs[regnum].set_addr (addr);
155
156      for (regnum = SPARC64_F32_REGNUM;
157	   regnum <= SPARC64_F62_REGNUM; regnum++, addr += 8)
158	cache->saved_regs[regnum].set_addr (addr);
159    }
160
161  return cache;
162}
163
164static void
165sparc64fbsd_sigtramp_frame_this_id (frame_info_ptr this_frame,
166				    void **this_cache,
167				    struct frame_id *this_id)
168{
169  struct sparc_frame_cache *cache =
170    sparc64fbsd_sigtramp_frame_cache (this_frame, this_cache);
171
172  (*this_id) = frame_id_build (cache->base, cache->pc);
173}
174
175static struct value *
176sparc64fbsd_sigtramp_frame_prev_register (frame_info_ptr this_frame,
177					  void **this_cache, int regnum)
178{
179  struct sparc_frame_cache *cache =
180    sparc64fbsd_sigtramp_frame_cache (this_frame, this_cache);
181
182  return trad_frame_get_prev_register (this_frame, cache->saved_regs, regnum);
183}
184
185static int
186sparc64fbsd_sigtramp_frame_sniffer (const struct frame_unwind *self,
187				    frame_info_ptr this_frame,
188				    void **this_cache)
189{
190  CORE_ADDR pc = get_frame_pc (this_frame);
191  const char *name;
192
193  find_pc_partial_function (pc, &name, NULL, NULL);
194  if (sparc64fbsd_pc_in_sigtramp (pc, name))
195    return 1;
196
197  return 0;
198}
199
200static const struct frame_unwind sparc64fbsd_sigtramp_frame_unwind =
201{
202  "sparc64 freebsd sigtramp",
203  SIGTRAMP_FRAME,
204  default_frame_unwind_stop_reason,
205  sparc64fbsd_sigtramp_frame_this_id,
206  sparc64fbsd_sigtramp_frame_prev_register,
207  NULL,
208  sparc64fbsd_sigtramp_frame_sniffer
209};
210
211
212static const struct regset sparc64fbsd_gregset =
213  {
214    NULL, sparc64fbsd_supply_gregset, sparc64fbsd_collect_gregset
215  };
216
217static const struct regset sparc64fbsd_fpregset =
218  {
219    NULL, sparc64fbsd_supply_fpregset, sparc64fbsd_collect_fpregset
220  };
221
222static void
223sparc64fbsd_init_abi (struct gdbarch_info info, struct gdbarch *gdbarch)
224{
225  sparc_gdbarch_tdep *tdep = gdbarch_tdep<sparc_gdbarch_tdep> (gdbarch);
226
227  /* Generic FreeBSD support. */
228  fbsd_init_abi (info, gdbarch);
229
230  tdep->gregset = &sparc64fbsd_gregset;
231  tdep->sizeof_gregset = 256;
232
233  tdep->fpregset = &sparc64fbsd_fpregset;
234  tdep->sizeof_fpregset = 272;
235
236  frame_unwind_append_unwinder (gdbarch, &sparc64fbsd_sigtramp_frame_unwind);
237
238  sparc64_init_abi (info, gdbarch);
239
240  /* FreeBSD/sparc64 has SVR4-style shared libraries.  */
241  set_gdbarch_skip_trampoline_code (gdbarch, find_solib_trampoline_target);
242  set_solib_svr4_fetch_link_map_offsets
243    (gdbarch, svr4_lp64_fetch_link_map_offsets);
244}
245
246void _initialize_sparc64fbsd_tdep ();
247void
248_initialize_sparc64fbsd_tdep ()
249{
250  gdbarch_register_osabi (bfd_arch_sparc, bfd_mach_sparc_v9,
251			  GDB_OSABI_FREEBSD, sparc64fbsd_init_abi);
252}
253