1/* Target-dependent code for FreeBSD/sparc64.
2
3   Copyright 2003, 2004 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 2 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, write to the Free Software
19   Foundation, Inc., 59 Temple Place - Suite 330,
20   Boston, MA 02111-1307, USA.  */
21
22#include "defs.h"
23#include "frame.h"
24#include "frame-unwind.h"
25#include "gdbcore.h"
26#include "osabi.h"
27#include "regcache.h"
28#include "regset.h"
29#include "target.h"
30#include "trad-frame.h"
31
32#include "gdb_assert.h"
33#include "gdb_string.h"
34
35#include "sparc64-tdep.h"
36
37/* From <machine/reg.h>.  */
38const struct sparc_gregset sparc64fbsd_gregset =
39{
40  26 * 8,			/* "tstate" */
41  25 * 8,			/* %pc */
42  24 * 8,			/* %npc */
43  28 * 8,			/* %y */
44  16 * 8,			/* %fprs */
45  -1,
46  1 * 8,			/* %g1 */
47  -1,				/* %l0 */
48  8				/* sizeof (%y) */
49};
50
51
52static void
53sparc64fbsd_supply_gregset (const struct regset *regset,
54			    struct regcache *regcache,
55			    int regnum, const void *gregs, size_t len)
56{
57  sparc64_supply_gregset (regset->descr, regcache, regnum, gregs);
58}
59
60static void
61sparc64fbsd_supply_fpregset (const struct regset *regset,
62			     struct regcache *regcache,
63			     int regnum, const void *fpregs, size_t len)
64{
65  sparc64_supply_fpregset (regcache, regnum, fpregs);
66}
67
68void
69supply_gregset (const void *gregs)
70{
71  sparc64_supply_gregset (&sparc64fbsd_gregset, current_regcache, -1, gregs);
72}
73
74void
75supply_fpregset (const void *fpregs)
76{
77  sparc64_supply_fpregset (current_regcache, -1, fpregs);
78}
79
80void
81fill_gregset (void *gregs, int regnum)
82{
83  sparc64_collect_gregset (&sparc64fbsd_gregset, current_regcache, regnum,
84			   gregs);
85}
86
87void
88fill_fpregset (void *fpregs, int regnum)
89{
90  sparc64_collect_fpregset (current_regcache, regnum, fpregs);
91}
92
93
94/* Signal trampolines.  */
95
96static int
97sparc64fbsd_pc_in_sigtramp (CORE_ADDR pc, char *name)
98{
99  return (name && strcmp (name, "__sigtramp") == 0);
100}
101
102static struct sparc_frame_cache *
103sparc64fbsd_sigtramp_frame_cache (struct frame_info *next_frame,
104				   void **this_cache)
105{
106  struct sparc_frame_cache *cache;
107  CORE_ADDR addr, mcontext_addr, sp;
108  LONGEST fprs;
109  int regnum;
110
111  if (*this_cache)
112    return *this_cache;
113
114  cache = sparc_frame_cache (next_frame, this_cache);
115  gdb_assert (cache == *this_cache);
116
117  cache->saved_regs = trad_frame_alloc_saved_regs (next_frame);
118
119  /* The third argument is a pointer to an instance of `ucontext_t',
120     which has a member `uc_mcontext' that contains the saved
121     registers.  */
122  addr = frame_unwind_register_unsigned (next_frame, SPARC_O2_REGNUM);
123  mcontext_addr = addr + 64;
124
125  /* The following registers travel in the `mc_local' slots of
126     `mcontext_t'.  */
127  addr = mcontext_addr + 16 * 8;
128  cache->saved_regs[SPARC64_FPRS_REGNUM].addr = addr + 0 * 8;
129  cache->saved_regs[SPARC64_FSR_REGNUM].addr = addr + 1 * 8;
130
131  /* The following registers travel in the `mc_in' slots of
132     `mcontext_t'.  */
133  addr = mcontext_addr + 24 * 8;
134  cache->saved_regs[SPARC64_NPC_REGNUM].addr = addr + 0 * 8;
135  cache->saved_regs[SPARC64_PC_REGNUM].addr = addr + 1 * 8;
136  cache->saved_regs[SPARC64_STATE_REGNUM].addr = addr + 2 * 8;
137  cache->saved_regs[SPARC64_Y_REGNUM].addr = addr + 4 * 8;
138
139  /* The `global' and `out' registers travel in the `mc_global' and
140     `mc_out' slots of `mcontext_t', except for %g0.  Since %g0 is
141     always zero, keep the identity encoding.  */
142  for (regnum = SPARC_G1_REGNUM, addr = mcontext_addr + 8;
143       regnum <= SPARC_O7_REGNUM; regnum++, addr += 8)
144    cache->saved_regs[regnum].addr = addr;
145
146  /* The `local' and `in' registers have been saved in the register
147     save area.  */
148  addr = cache->saved_regs[SPARC_SP_REGNUM].addr;
149  sp = get_frame_memory_unsigned (next_frame, addr, 8);
150  for (regnum = SPARC_L0_REGNUM, addr = sp + BIAS;
151       regnum <= SPARC_I7_REGNUM; regnum++, addr += 8)
152    cache->saved_regs[regnum].addr = addr;
153
154  /* The floating-point registers are only saved if the FEF bit in
155     %fprs has been set.  */
156
157#define FPRS_FEF	(1 << 2)
158
159  addr = cache->saved_regs[SPARC64_FPRS_REGNUM].addr;
160  fprs = get_frame_memory_unsigned (next_frame, addr, 8);
161  if (fprs & FPRS_FEF)
162    {
163      for (regnum = SPARC_F0_REGNUM, addr = mcontext_addr + 32 * 8;
164	   regnum <= SPARC_F31_REGNUM; regnum++, addr += 4)
165	cache->saved_regs[regnum].addr = addr;
166
167      for (regnum = SPARC64_F32_REGNUM;
168	   regnum <= SPARC64_F62_REGNUM; regnum++, addr += 8)
169	cache->saved_regs[regnum].addr = addr;
170    }
171
172  return cache;
173}
174
175static void
176sparc64fbsd_sigtramp_frame_this_id (struct frame_info *next_frame,
177				    void **this_cache,
178				    struct frame_id *this_id)
179{
180  struct sparc_frame_cache *cache =
181    sparc64fbsd_sigtramp_frame_cache (next_frame, this_cache);
182
183  (*this_id) = frame_id_build (cache->base, cache->pc);
184}
185
186static void
187sparc64fbsd_sigtramp_frame_prev_register (struct frame_info *next_frame,
188					  void **this_cache,
189					  int regnum, int *optimizedp,
190					  enum lval_type *lvalp,
191					  CORE_ADDR *addrp,
192					  int *realnump, void *valuep)
193{
194  struct sparc_frame_cache *cache =
195    sparc64fbsd_sigtramp_frame_cache (next_frame, this_cache);
196
197  trad_frame_prev_register (next_frame, cache->saved_regs, regnum,
198			    optimizedp, lvalp, addrp, realnump, valuep);
199}
200
201static const struct frame_unwind sparc64fbsd_sigtramp_frame_unwind =
202{
203  SIGTRAMP_FRAME,
204  sparc64fbsd_sigtramp_frame_this_id,
205  sparc64fbsd_sigtramp_frame_prev_register
206};
207
208static const struct frame_unwind *
209sparc64fbsd_sigtramp_frame_sniffer (struct frame_info *next_frame)
210{
211  CORE_ADDR pc = frame_pc_unwind (next_frame);
212  char *name;
213
214  find_pc_partial_function (pc, &name, NULL, NULL);
215  if (sparc64fbsd_pc_in_sigtramp (pc, name))
216    return &sparc64fbsd_sigtramp_frame_unwind;
217
218  return NULL;
219}
220
221
222static void
223sparc64fbsd_init_abi (struct gdbarch_info info, struct gdbarch *gdbarch)
224{
225  struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch);
226
227  tdep->gregset = XMALLOC (struct regset);
228  tdep->gregset->descr = &sparc64fbsd_gregset;
229  tdep->gregset->supply_regset = sparc64fbsd_supply_gregset;
230  tdep->sizeof_gregset = 256;
231
232  tdep->fpregset = XMALLOC (struct regset);
233  tdep->fpregset->supply_regset = sparc64fbsd_supply_fpregset;
234  tdep->sizeof_fpregset = 272;
235
236  set_gdbarch_pc_in_sigtramp (gdbarch, sparc64fbsd_pc_in_sigtramp);
237  frame_unwind_append_sniffer (gdbarch, sparc64fbsd_sigtramp_frame_sniffer);
238
239  sparc64_init_abi (info, gdbarch);
240}
241
242/* Provide a prototype to silence -Wmissing-prototypes.  */
243void _initialize_sparc64fbsd_tdep (void);
244
245void
246_initialize_sparc64fbsd_tdep (void)
247{
248  gdbarch_register_osabi (bfd_arch_sparc, bfd_mach_sparc_v9,
249			  GDB_OSABI_FREEBSD_ELF, sparc64fbsd_init_abi);
250}
251