OpenCores
URL https://opencores.org/ocsvn/openrisc/openrisc/trunk

Subversion Repositories openrisc

[/] [openrisc/] [trunk/] [gnu-old/] [gdb-6.8/] [gdb/] [m68kbsd-tdep.c] - Blame information for rev 840

Details | Compare with Previous | View Log

Line No. Rev Author Line
1 24 jeremybenn
/* Target-dependent code for Motorola 68000 BSD's.
2
 
3
   Copyright (C) 2004, 2005, 2007, 2008 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 "arch-utils.h"
22
#include "frame.h"
23
#include "osabi.h"
24
#include "regcache.h"
25
#include "regset.h"
26
#include "trad-frame.h"
27
#include "tramp-frame.h"
28
#include "gdbtypes.h"
29
 
30
#include "gdb_assert.h"
31
#include "gdb_string.h"
32
 
33
#include "m68k-tdep.h"
34
#include "solib-svr4.h"
35
 
36
/* Core file support.  */
37
 
38
/* Sizeof `struct reg' in <machine/reg.h>.  */
39
#define M68KBSD_SIZEOF_GREGS    (18 * 4)
40
 
41
/* Sizeof `struct fpreg' in <machine/reg.h.  */
42
#define M68KBSD_SIZEOF_FPREGS   (((8 * 3) + 3) * 4)
43
 
44
int
45
m68kbsd_fpreg_offset (int regnum)
46
{
47
  int fp_len = TYPE_LENGTH (gdbarch_register_type (current_gdbarch, regnum));
48
 
49
  if (regnum >= M68K_FPC_REGNUM)
50
    return 8 * fp_len + (regnum - M68K_FPC_REGNUM) * 4;
51
 
52
  return (regnum - M68K_FP0_REGNUM) * fp_len;
53
}
54
 
55
/* Supply register REGNUM from the buffer specified by FPREGS and LEN
56
   in the floating-point register set REGSET to register cache
57
   REGCACHE.  If REGNUM is -1, do this for all registers in REGSET.  */
58
 
59
static void
60
m68kbsd_supply_fpregset (const struct regset *regset,
61
                         struct regcache *regcache,
62
                         int regnum, const void *fpregs, size_t len)
63
{
64
  const gdb_byte *regs = fpregs;
65
  int i;
66
 
67
  gdb_assert (len >= M68KBSD_SIZEOF_FPREGS);
68
 
69
  for (i = M68K_FP0_REGNUM; i <= M68K_PC_REGNUM; i++)
70
    {
71
      if (regnum == i || regnum == -1)
72
        regcache_raw_supply (regcache, i, regs + m68kbsd_fpreg_offset (i));
73
    }
74
}
75
 
76
/* Supply register REGNUM from the buffer specified by GREGS and LEN
77
   in the general-purpose register set REGSET to register cache
78
   REGCACHE.  If REGNUM is -1, do this for all registers in REGSET.  */
79
 
80
static void
81
m68kbsd_supply_gregset (const struct regset *regset,
82
                        struct regcache *regcache,
83
                        int regnum, const void *gregs, size_t len)
84
{
85
  const gdb_byte *regs = gregs;
86
  int i;
87
 
88
  gdb_assert (len >= M68KBSD_SIZEOF_GREGS);
89
 
90
  for (i = M68K_D0_REGNUM; i <= M68K_PC_REGNUM; i++)
91
    {
92
      if (regnum == i || regnum == -1)
93
        regcache_raw_supply (regcache, i, regs + i * 4);
94
    }
95
 
96
  if (len >= M68KBSD_SIZEOF_GREGS + M68KBSD_SIZEOF_FPREGS)
97
    {
98
      regs += M68KBSD_SIZEOF_GREGS;
99
      len -= M68KBSD_SIZEOF_GREGS;
100
      m68kbsd_supply_fpregset (regset, regcache, regnum, regs, len);
101
    }
102
}
103
 
104
/* Motorola 68000 register sets.  */
105
 
106
static struct regset m68kbsd_gregset =
107
{
108
  NULL,
109
  m68kbsd_supply_gregset
110
};
111
 
112
static struct regset m68kbsd_fpregset =
113
{
114
  NULL,
115
  m68kbsd_supply_fpregset
116
};
117
 
118
/* Return the appropriate register set for the core section identified
119
   by SECT_NAME and SECT_SIZE.  */
120
 
121
static const struct regset *
122
m68kbsd_regset_from_core_section (struct gdbarch *gdbarch,
123
                                  const char *sect_name, size_t sect_size)
124
{
125
  if (strcmp (sect_name, ".reg") == 0 && sect_size >= M68KBSD_SIZEOF_GREGS)
126
    return &m68kbsd_gregset;
127
 
128
  if (strcmp (sect_name, ".reg2") == 0 && sect_size >= M68KBSD_SIZEOF_FPREGS)
129
    return &m68kbsd_fpregset;
130
 
131
  return NULL;
132
}
133
 
134
 
135
/* Signal trampolines.  */
136
 
137
static void
138
m68kobsd_sigtramp_cache_init (const struct tramp_frame *self,
139
                              struct frame_info *next_frame,
140
                              struct trad_frame_cache *this_cache,
141
                              CORE_ADDR func)
142
{
143
  CORE_ADDR addr, base, pc;
144
  int regnum;
145
 
146
  base = frame_unwind_register_unsigned (next_frame, M68K_SP_REGNUM);
147
 
148
  /* The 'addql #4,%sp' instruction at offset 8 adjusts the stack
149
     pointer.  Adjust the frame base accordingly.  */
150
  pc = frame_unwind_register_unsigned (next_frame, M68K_PC_REGNUM);
151
  if ((pc - func) > 8)
152
    base -= 4;
153
 
154
  /* Get frame pointer, stack pointer, program counter and processor
155
     state from `struct sigcontext'.  */
156
  addr = get_frame_memory_unsigned (next_frame, base + 8, 4);
157
  trad_frame_set_reg_addr (this_cache, M68K_FP_REGNUM, addr + 8);
158
  trad_frame_set_reg_addr (this_cache, M68K_SP_REGNUM, addr + 12);
159
  trad_frame_set_reg_addr (this_cache, M68K_PC_REGNUM, addr + 20);
160
  trad_frame_set_reg_addr (this_cache, M68K_PS_REGNUM, addr + 24);
161
 
162
  /* The sc_ap member of `struct sigcontext' points to additional
163
     hardware state.  Here we find the missing registers.  */
164
  addr = get_frame_memory_unsigned (next_frame, addr + 16, 4) + 4;
165
  for (regnum = M68K_D0_REGNUM; regnum < M68K_FP_REGNUM; regnum++, addr += 4)
166
    trad_frame_set_reg_addr (this_cache, regnum, addr);
167
 
168
  /* Construct the frame ID using the function start.  */
169
  trad_frame_set_id (this_cache, frame_id_build (base, func));
170
}
171
 
172
static const struct tramp_frame m68kobsd_sigtramp = {
173
  SIGTRAMP_FRAME,
174
  2,
175
  {
176
    { 0x206f, -1 }, { 0x000c, -1},      /* moveal %sp@(12),%a0 */
177
    { 0x4e90, -1 },                     /* jsr %a0@ */
178
    { 0x588f, -1 },                     /* addql #4,%sp */
179
    { 0x4e41, -1 },                     /* trap #1 */
180
    { 0x2f40, -1 }, { 0x0004, -1 },     /* moveal %d0,%sp@(4) */
181
    { 0x7001, -1 },                     /* moveq #SYS_exit,%d0 */
182
    { 0x4e40, -1 },                     /* trap #0 */
183
    { TRAMP_SENTINEL_INSN, -1 }
184
  },
185
  m68kobsd_sigtramp_cache_init
186
};
187
 
188
 
189
static void
190
m68kbsd_init_abi (struct gdbarch_info info, struct gdbarch *gdbarch)
191
{
192
  struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch);
193
 
194
  tdep->jb_pc = 5;
195
  tdep->jb_elt_size = 4;
196
 
197
  set_gdbarch_decr_pc_after_break (gdbarch, 2);
198
 
199
  set_gdbarch_regset_from_core_section
200
    (gdbarch, m68kbsd_regset_from_core_section);
201
}
202
 
203
/* OpenBSD and NetBSD a.out.  */
204
 
205
static void
206
m68kbsd_aout_init_abi (struct gdbarch_info info, struct gdbarch *gdbarch)
207
{
208
  struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch);
209
 
210
  m68kbsd_init_abi (info, gdbarch);
211
 
212
  tdep->struct_return = reg_struct_return;
213
 
214
  tramp_frame_prepend_unwinder (gdbarch, &m68kobsd_sigtramp);
215
}
216
 
217
/* NetBSD ELF.  */
218
 
219
static void
220
m68kbsd_elf_init_abi (struct gdbarch_info info, struct gdbarch *gdbarch)
221
{
222
  struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch);
223
 
224
  m68kbsd_init_abi (info, gdbarch);
225
 
226
  /* NetBSD ELF uses the SVR4 ABI.  */
227
  m68k_svr4_init_abi (info, gdbarch);
228
  tdep->struct_return = pcc_struct_return;
229
 
230
  /* NetBSD ELF uses SVR4-style shared libraries.  */
231
  set_solib_svr4_fetch_link_map_offsets
232
    (gdbarch, svr4_ilp32_fetch_link_map_offsets);
233
}
234
 
235
 
236
static enum gdb_osabi
237
m68kbsd_aout_osabi_sniffer (bfd *abfd)
238
{
239
  if (strcmp (bfd_get_target (abfd), "a.out-m68k-netbsd") == 0
240
      || strcmp (bfd_get_target (abfd), "a.out-m68k4k-netbsd") == 0)
241
    return GDB_OSABI_NETBSD_AOUT;
242
 
243
  return GDB_OSABI_UNKNOWN;
244
}
245
 
246
static enum gdb_osabi
247
m68kbsd_core_osabi_sniffer (bfd *abfd)
248
{
249
  if (strcmp (bfd_get_target (abfd), "netbsd-core") == 0)
250
    return GDB_OSABI_NETBSD_AOUT;
251
 
252
  return GDB_OSABI_UNKNOWN;
253
}
254
 
255
 
256
/* Provide a prototype to silence -Wmissing-prototypes.  */
257
void _initialize_m68kbsd_tdep (void);
258
 
259
void
260
_initialize_m68kbsd_tdep (void)
261
{
262
  gdbarch_register_osabi_sniffer (bfd_arch_m68k, bfd_target_aout_flavour,
263
                                  m68kbsd_aout_osabi_sniffer);
264
 
265
  /* BFD doesn't set a flavour for NetBSD style a.out core files.  */
266
  gdbarch_register_osabi_sniffer (bfd_arch_m68k, bfd_target_unknown_flavour,
267
                                  m68kbsd_core_osabi_sniffer);
268
 
269
  gdbarch_register_osabi (bfd_arch_m68k, 0, GDB_OSABI_NETBSD_AOUT,
270
                          m68kbsd_aout_init_abi);
271
  gdbarch_register_osabi (bfd_arch_m68k, 0, GDB_OSABI_NETBSD_ELF,
272
                          m68kbsd_elf_init_abi);
273
}

powered by: WebSVN 2.1.0

© copyright 1999-2024 OpenCores.org, equivalent to Oliscience, all rights reserved. OpenCores®, registered trademark.