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 (&sparc64fbsd_gregset, 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
68
69/* Signal trampolines.  */
70
71static int
72sparc64fbsd_pc_in_sigtramp (CORE_ADDR pc, char *name)
73{
74  return (name && strcmp (name, "__sigtramp") == 0);
75}
76
77static struct sparc_frame_cache *
78sparc64fbsd_sigtramp_frame_cache (struct frame_info *next_frame,
79				   void **this_cache)
80{
81  struct sparc_frame_cache *cache;
82  CORE_ADDR addr, mcontext_addr, sp;
83  LONGEST fprs;
84  int regnum;
85
86  if (*this_cache)
87    return *this_cache;
88
89  cache = sparc_frame_cache (next_frame, this_cache);
90  gdb_assert (cache == *this_cache);
91
92  cache->saved_regs = trad_frame_alloc_saved_regs (next_frame);
93
94  /* The third argument is a pointer to an instance of `ucontext_t',
95     which has a member `uc_mcontext' that contains the saved
96     registers.  */
97  addr = frame_unwind_register_unsigned (next_frame, SPARC_O2_REGNUM);
98  mcontext_addr = addr + 64;
99
100  /* The following registers travel in the `mc_local' slots of
101     `mcontext_t'.  */
102  addr = mcontext_addr + 16 * 8;
103  cache->saved_regs[SPARC64_FPRS_REGNUM].addr = addr + 0 * 8;
104  cache->saved_regs[SPARC64_FSR_REGNUM].addr = addr + 1 * 8;
105
106  /* The following registers travel in the `mc_in' slots of
107     `mcontext_t'.  */
108  addr = mcontext_addr + 24 * 8;
109  cache->saved_regs[SPARC64_NPC_REGNUM].addr = addr + 0 * 8;
110  cache->saved_regs[SPARC64_PC_REGNUM].addr = addr + 1 * 8;
111  cache->saved_regs[SPARC64_STATE_REGNUM].addr = addr + 2 * 8;
112  cache->saved_regs[SPARC64_Y_REGNUM].addr = addr + 4 * 8;
113
114  /* The `global' and `out' registers travel in the `mc_global' and
115     `mc_out' slots of `mcontext_t', except for %g0.  Since %g0 is
116     always zero, keep the identity encoding.  */
117  for (regnum = SPARC_G1_REGNUM, addr = mcontext_addr + 8;
118       regnum <= SPARC_O7_REGNUM; regnum++, addr += 8)
119    cache->saved_regs[regnum].addr = addr;
120
121  /* The `local' and `in' registers have been saved in the register
122     save area.  */
123  addr = cache->saved_regs[SPARC_SP_REGNUM].addr;
124  sp = get_frame_memory_unsigned (next_frame, addr, 8);
125  for (regnum = SPARC_L0_REGNUM, addr = sp + BIAS;
126       regnum <= SPARC_I7_REGNUM; regnum++, addr += 8)
127    cache->saved_regs[regnum].addr = addr;
128
129  /* The floating-point registers are only saved if the FEF bit in
130     %fprs has been set.  */
131
132#define FPRS_FEF	(1 << 2)
133
134  addr = cache->saved_regs[SPARC64_FPRS_REGNUM].addr;
135  fprs = get_frame_memory_unsigned (next_frame, addr, 8);
136  if (fprs & FPRS_FEF)
137    {
138      for (regnum = SPARC_F0_REGNUM, addr = mcontext_addr + 32 * 8;
139	   regnum <= SPARC_F31_REGNUM; regnum++, addr += 4)
140	cache->saved_regs[regnum].addr = addr;
141
142      for (regnum = SPARC64_F32_REGNUM;
143	   regnum <= SPARC64_F62_REGNUM; regnum++, addr += 8)
144	cache->saved_regs[regnum].addr = addr;
145    }
146
147  return cache;
148}
149
150static void
151sparc64fbsd_sigtramp_frame_this_id (struct frame_info *next_frame,
152				    void **this_cache,
153				    struct frame_id *this_id)
154{
155  struct sparc_frame_cache *cache =
156    sparc64fbsd_sigtramp_frame_cache (next_frame, this_cache);
157
158  (*this_id) = frame_id_build (cache->base, cache->pc);
159}
160
161static void
162sparc64fbsd_sigtramp_frame_prev_register (struct frame_info *next_frame,
163					  void **this_cache,
164					  int regnum, int *optimizedp,
165					  enum lval_type *lvalp,
166					  CORE_ADDR *addrp,
167					  int *realnump, void *valuep)
168{
169  struct sparc_frame_cache *cache =
170    sparc64fbsd_sigtramp_frame_cache (next_frame, this_cache);
171
172  trad_frame_get_prev_register (next_frame, cache->saved_regs, regnum,
173				optimizedp, lvalp, addrp, realnump, valuep);
174}
175
176static const struct frame_unwind sparc64fbsd_sigtramp_frame_unwind =
177{
178  SIGTRAMP_FRAME,
179  sparc64fbsd_sigtramp_frame_this_id,
180  sparc64fbsd_sigtramp_frame_prev_register
181};
182
183static const struct frame_unwind *
184sparc64fbsd_sigtramp_frame_sniffer (struct frame_info *next_frame)
185{
186  CORE_ADDR pc = frame_pc_unwind (next_frame);
187  char *name;
188
189  find_pc_partial_function (pc, &name, NULL, NULL);
190  if (sparc64fbsd_pc_in_sigtramp (pc, name))
191    return &sparc64fbsd_sigtramp_frame_unwind;
192
193  return NULL;
194}
195
196
197static void
198sparc64fbsd_init_abi (struct gdbarch_info info, struct gdbarch *gdbarch)
199{
200  struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch);
201
202  tdep->gregset = regset_alloc (gdbarch, sparc64fbsd_supply_gregset, NULL);
203  tdep->sizeof_gregset = 256;
204
205  tdep->fpregset = regset_alloc (gdbarch, sparc64fbsd_supply_fpregset, NULL);
206  tdep->sizeof_fpregset = 272;
207
208  frame_unwind_append_sniffer (gdbarch, sparc64fbsd_sigtramp_frame_sniffer);
209
210  sparc64_init_abi (info, gdbarch);
211}
212
213/* Provide a prototype to silence -Wmissing-prototypes.  */
214void _initialize_sparc64fbsd_tdep (void);
215
216void
217_initialize_sparc64fbsd_tdep (void)
218{
219  gdbarch_register_osabi (bfd_arch_sparc, bfd_mach_sparc_v9,
220			  GDB_OSABI_FREEBSD_ELF, sparc64fbsd_init_abi);
221}
222