1/* Target-dependent code for FreeBSD/sparc64.
2
3   Copyright (C) 2003, 2004, 2005, 2007 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 "gdb_assert.h"
31#include "gdb_string.h"
32
33#include "sparc64-tdep.h"
34#include "solib-svr4.h"
35
36/* From <machine/reg.h>.  */
37const struct sparc_gregset sparc64fbsd_gregset =
38{
39  26 * 8,			/* "tstate" */
40  25 * 8,			/* %pc */
41  24 * 8,			/* %npc */
42  28 * 8,			/* %y */
43  16 * 8,			/* %fprs */
44  -1,
45  1 * 8,			/* %g1 */
46  -1,				/* %l0 */
47  8				/* sizeof (%y) */
48};
49
50
51static void
52sparc64fbsd_supply_gregset (const struct regset *regset,
53			    struct regcache *regcache,
54			    int regnum, const void *gregs, size_t len)
55{
56  sparc64_supply_gregset (&sparc64fbsd_gregset, regcache, regnum, gregs);
57}
58
59static void
60sparc64fbsd_collect_gregset (const struct regset *regset,
61			     const struct regcache *regcache,
62			     int regnum, void *gregs, size_t len)
63{
64  sparc64_collect_gregset (&sparc64fbsd_gregset, regcache, regnum, gregs);
65}
66
67static void
68sparc64fbsd_supply_fpregset (const struct regset *regset,
69			     struct regcache *regcache,
70			     int regnum, const void *fpregs, size_t len)
71{
72  sparc64_supply_fpregset (regcache, regnum, fpregs);
73}
74
75static void
76sparc64fbsd_collect_fpregset (const struct regset *regset,
77			      const struct regcache *regcache,
78			      int regnum, void *fpregs, size_t len)
79{
80  sparc64_collect_fpregset (regcache, regnum, fpregs);
81}
82
83
84/* Signal trampolines.  */
85
86static int
87sparc64fbsd_pc_in_sigtramp (CORE_ADDR pc, char *name)
88{
89  return (name && strcmp (name, "__sigtramp") == 0);
90}
91
92static struct sparc_frame_cache *
93sparc64fbsd_sigtramp_frame_cache (struct frame_info *next_frame,
94				   void **this_cache)
95{
96  struct sparc_frame_cache *cache;
97  CORE_ADDR addr, mcontext_addr, sp;
98  LONGEST fprs;
99  int regnum;
100
101  if (*this_cache)
102    return *this_cache;
103
104  cache = sparc_frame_cache (next_frame, this_cache);
105  gdb_assert (cache == *this_cache);
106
107  cache->saved_regs = trad_frame_alloc_saved_regs (next_frame);
108
109  /* The third argument is a pointer to an instance of `ucontext_t',
110     which has a member `uc_mcontext' that contains the saved
111     registers.  */
112  addr = frame_unwind_register_unsigned (next_frame, SPARC_O2_REGNUM);
113  mcontext_addr = addr + 64;
114
115  /* The following registers travel in the `mc_local' slots of
116     `mcontext_t'.  */
117  addr = mcontext_addr + 16 * 8;
118  cache->saved_regs[SPARC64_FPRS_REGNUM].addr = addr + 0 * 8;
119  cache->saved_regs[SPARC64_FSR_REGNUM].addr = addr + 1 * 8;
120
121  /* The following registers travel in the `mc_in' slots of
122     `mcontext_t'.  */
123  addr = mcontext_addr + 24 * 8;
124  cache->saved_regs[SPARC64_NPC_REGNUM].addr = addr + 0 * 8;
125  cache->saved_regs[SPARC64_PC_REGNUM].addr = addr + 1 * 8;
126  cache->saved_regs[SPARC64_STATE_REGNUM].addr = addr + 2 * 8;
127  cache->saved_regs[SPARC64_Y_REGNUM].addr = addr + 4 * 8;
128
129  /* The `global' and `out' registers travel in the `mc_global' and
130     `mc_out' slots of `mcontext_t', except for %g0.  Since %g0 is
131     always zero, keep the identity encoding.  */
132  for (regnum = SPARC_G1_REGNUM, addr = mcontext_addr + 8;
133       regnum <= SPARC_O7_REGNUM; regnum++, addr += 8)
134    cache->saved_regs[regnum].addr = addr;
135
136  /* The `local' and `in' registers have been saved in the register
137     save area.  */
138  addr = cache->saved_regs[SPARC_SP_REGNUM].addr;
139  sp = get_frame_memory_unsigned (next_frame, addr, 8);
140  for (regnum = SPARC_L0_REGNUM, addr = sp + BIAS;
141       regnum <= SPARC_I7_REGNUM; regnum++, addr += 8)
142    cache->saved_regs[regnum].addr = addr;
143
144  /* The floating-point registers are only saved if the FEF bit in
145     %fprs has been set.  */
146
147#define FPRS_FEF	(1 << 2)
148
149  addr = cache->saved_regs[SPARC64_FPRS_REGNUM].addr;
150  fprs = get_frame_memory_unsigned (next_frame, addr, 8);
151  if (fprs & FPRS_FEF)
152    {
153      for (regnum = SPARC_F0_REGNUM, addr = mcontext_addr + 32 * 8;
154	   regnum <= SPARC_F31_REGNUM; regnum++, addr += 4)
155	cache->saved_regs[regnum].addr = addr;
156
157      for (regnum = SPARC64_F32_REGNUM;
158	   regnum <= SPARC64_F62_REGNUM; regnum++, addr += 8)
159	cache->saved_regs[regnum].addr = addr;
160    }
161
162  return cache;
163}
164
165static void
166sparc64fbsd_sigtramp_frame_this_id (struct frame_info *next_frame,
167				    void **this_cache,
168				    struct frame_id *this_id)
169{
170  struct sparc_frame_cache *cache =
171    sparc64fbsd_sigtramp_frame_cache (next_frame, this_cache);
172
173  (*this_id) = frame_id_build (cache->base, cache->pc);
174}
175
176static void
177sparc64fbsd_sigtramp_frame_prev_register (struct frame_info *next_frame,
178					  void **this_cache,
179					  int regnum, int *optimizedp,
180					  enum lval_type *lvalp,
181					  CORE_ADDR *addrp,
182					  int *realnump, gdb_byte *valuep)
183{
184  struct sparc_frame_cache *cache =
185    sparc64fbsd_sigtramp_frame_cache (next_frame, this_cache);
186
187  trad_frame_get_prev_register (next_frame, cache->saved_regs, regnum,
188				optimizedp, lvalp, addrp, realnump, valuep);
189}
190
191static const struct frame_unwind sparc64fbsd_sigtramp_frame_unwind =
192{
193  SIGTRAMP_FRAME,
194  sparc64fbsd_sigtramp_frame_this_id,
195  sparc64fbsd_sigtramp_frame_prev_register
196};
197
198static const struct frame_unwind *
199sparc64fbsd_sigtramp_frame_sniffer (struct frame_info *next_frame)
200{
201  CORE_ADDR pc = frame_pc_unwind (next_frame);
202  char *name;
203
204  find_pc_partial_function (pc, &name, NULL, NULL);
205  if (sparc64fbsd_pc_in_sigtramp (pc, name))
206    return &sparc64fbsd_sigtramp_frame_unwind;
207
208  return NULL;
209}
210
211
212static void
213sparc64fbsd_init_abi (struct gdbarch_info info, struct gdbarch *gdbarch)
214{
215  struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch);
216
217  tdep->gregset = regset_alloc (gdbarch, sparc64fbsd_supply_gregset,
218				sparc64fbsd_collect_gregset);
219  tdep->sizeof_gregset = 256;
220
221  tdep->fpregset = regset_alloc (gdbarch, sparc64fbsd_supply_fpregset,
222				 sparc64fbsd_collect_fpregset);
223  tdep->sizeof_fpregset = 272;
224
225  frame_unwind_append_sniffer (gdbarch, sparc64fbsd_sigtramp_frame_sniffer);
226
227  sparc64_init_abi (info, gdbarch);
228
229  /* FreeBSD/sparc64 has SVR4-style shared libraries.  */
230  set_gdbarch_skip_trampoline_code (gdbarch, find_solib_trampoline_target);
231  set_solib_svr4_fetch_link_map_offsets
232    (gdbarch, svr4_lp64_fetch_link_map_offsets);
233}
234
235/* Provide a prototype to silence -Wmissing-prototypes.  */
236void _initialize_sparc64fbsd_tdep (void);
237
238void
239_initialize_sparc64fbsd_tdep (void)
240{
241  gdbarch_register_osabi (bfd_arch_sparc, bfd_mach_sparc_v9,
242			  GDB_OSABI_FREEBSD_ELF, sparc64fbsd_init_abi);
243}
244