aboutsummaryrefslogtreecommitdiff
path: root/gdb/loongarch-linux-nat.c
blob: 40231d5d753cb80991ec25aa1dbcc8db00cf5542 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
/* Native-dependent code for GNU/Linux on LoongArch processors.

   Copyright (C) 2022-2023 Free Software Foundation, Inc.
   Contributed by Loongson Ltd.

   This file is part of GDB.

   This program is free software; you can redistribute it and/or modify
   it under the terms of the GNU General Public License as published by
   the Free Software Foundation; either version 3 of the License, or
   (at your option) any later version.

   This program is distributed in the hope that it will be useful,
   but WITHOUT ANY WARRANTY; without even the implied warranty of
   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
   GNU General Public License for more details.

   You should have received a copy of the GNU General Public License
   along with this program.  If not, see <http://www.gnu.org/licenses/>.  */

#include "defs.h"
#include "elf/common.h"
#include "gregset.h"
#include "inferior.h"
#include "linux-nat-trad.h"
#include "loongarch-tdep.h"
#include "nat/gdb_ptrace.h"
#include "target-descriptions.h"

#include <asm/ptrace.h>

/* LoongArch Linux native additions to the default Linux support.  */

class loongarch_linux_nat_target final : public linux_nat_trad_target
{
public:
  /* Add our register access methods.  */
  void fetch_registers (struct regcache *, int) override;
  void store_registers (struct regcache *, int) override;

protected:
  /* Override linux_nat_trad_target methods.  */
  CORE_ADDR register_u_offset (struct gdbarch *gdbarch, int regnum,
			       int store_p) override;
};

/* Fill GDB's register array with the general-purpose, orig_a0, pc and badv
   register values from the current thread.  */

static void
fetch_gregs_from_thread (struct regcache *regcache, int regnum, pid_t tid)
{
  elf_gregset_t regset;

  if (regnum == -1 || (regnum >= 0 && regnum < 32)
      || regnum == LOONGARCH_ORIG_A0_REGNUM
      || regnum == LOONGARCH_PC_REGNUM
      || regnum == LOONGARCH_BADV_REGNUM)
  {
    struct iovec iov;

    iov.iov_base = &regset;
    iov.iov_len = sizeof (regset);

    if (ptrace (PTRACE_GETREGSET, tid, NT_PRSTATUS, (long) &iov) < 0)
      perror_with_name (_("Couldn't get NT_PRSTATUS registers"));
    else
      loongarch_gregset.supply_regset (nullptr, regcache, -1,
				       &regset, sizeof (regset));
  }
}

/* Store to the current thread the valid general-purpose, orig_a0, pc and badv
   register values in the GDB's register array.  */

static void
store_gregs_to_thread (struct regcache *regcache, int regnum, pid_t tid)
{
  elf_gregset_t regset;

  if (regnum == -1 || (regnum >= 0 && regnum < 32)
      || regnum == LOONGARCH_ORIG_A0_REGNUM
      || regnum == LOONGARCH_PC_REGNUM
      || regnum == LOONGARCH_BADV_REGNUM)
  {
    struct iovec iov;

    iov.iov_base = &regset;
    iov.iov_len = sizeof (regset);

    if (ptrace (PTRACE_GETREGSET, tid, NT_PRSTATUS, (long) &iov) < 0)
      perror_with_name (_("Couldn't get NT_PRSTATUS registers"));
    else
      {
	loongarch_gregset.collect_regset (nullptr, regcache, regnum,
					  &regset, sizeof (regset));
	if (ptrace (PTRACE_SETREGSET, tid, NT_PRSTATUS, (long) &iov) < 0)
	  perror_with_name (_("Couldn't set NT_PRSTATUS registers"));
      }
  }
}

/* Fill GDB's register array with the fp, fcc and fcsr
   register values from the current thread.  */

static void
fetch_fpregs_from_thread (struct regcache *regcache, int regnum, pid_t tid)
{
  elf_fpregset_t regset;

  if ((regnum == -1)
      || (regnum >= LOONGARCH_FIRST_FP_REGNUM && regnum <= LOONGARCH_FCSR_REGNUM))
    {
      struct iovec iovec = { .iov_base = &regset, .iov_len = sizeof (regset) };

      if (ptrace (PTRACE_GETREGSET, tid, NT_FPREGSET, (long) &iovec) < 0)
	perror_with_name (_("Couldn't get NT_FPREGSET registers"));
      else
	loongarch_fpregset.supply_regset (nullptr, regcache, -1,
					  &regset, sizeof (regset));
    }
}

/* Store to the current thread the valid fp, fcc and fcsr
   register values in the GDB's register array.  */

static void
store_fpregs_to_thread (struct regcache *regcache, int regnum, pid_t tid)
{
  elf_fpregset_t regset;

  if ((regnum == -1)
      || (regnum >= LOONGARCH_FIRST_FP_REGNUM && regnum <= LOONGARCH_FCSR_REGNUM))
    {
      struct iovec iovec = { .iov_base = &regset, .iov_len = sizeof (regset) };

      if (ptrace (PTRACE_GETREGSET, tid, NT_FPREGSET, (long) &iovec) < 0)
	perror_with_name (_("Couldn't get NT_FPREGSET registers"));
      else
	{
	  loongarch_fpregset.collect_regset (nullptr, regcache, regnum,
					     &regset, sizeof (regset));
	  if (ptrace (PTRACE_SETREGSET, tid, NT_FPREGSET, (long) &iovec) < 0)
	    perror_with_name (_("Couldn't set NT_FPREGSET registers"));
	}
    }
}

/* Implement the "fetch_registers" target_ops method.  */

void
loongarch_linux_nat_target::fetch_registers (struct regcache *regcache,
					     int regnum)
{
  pid_t tid = get_ptrace_pid (regcache->ptid ());

  fetch_gregs_from_thread(regcache, regnum, tid);
  fetch_fpregs_from_thread(regcache, regnum, tid);
}

/* Implement the "store_registers" target_ops method.  */

void
loongarch_linux_nat_target::store_registers (struct regcache *regcache,
					     int regnum)
{
  pid_t tid = get_ptrace_pid (regcache->ptid ());

  store_gregs_to_thread (regcache, regnum, tid);
  store_fpregs_to_thread(regcache, regnum, tid);
}

/* Return the address in the core dump or inferior of register REGNO.  */

CORE_ADDR
loongarch_linux_nat_target::register_u_offset (struct gdbarch *gdbarch,
					       int regnum, int store_p)
{
  if (regnum >= 0 && regnum < 32)
    return regnum;
  else if (regnum == LOONGARCH_PC_REGNUM)
    return LOONGARCH_PC_REGNUM;
  else
    return -1;
}

static loongarch_linux_nat_target the_loongarch_linux_nat_target;

/* Wrapper functions.  These are only used by libthread_db.  */

void
supply_gregset (struct regcache *regcache, const gdb_gregset_t *gregset)
{
  loongarch_gregset.supply_regset (nullptr, regcache, -1, gregset,
				   sizeof (gdb_gregset_t));
}

void
fill_gregset (const struct regcache *regcache, gdb_gregset_t *gregset,
	      int regnum)
{
  loongarch_gregset.collect_regset (nullptr, regcache, regnum, gregset,
				    sizeof (gdb_gregset_t));
}

void
supply_fpregset (struct regcache *regcache, const gdb_fpregset_t *fpregset)
{
  loongarch_fpregset.supply_regset (nullptr, regcache, -1, fpregset,
				    sizeof (gdb_fpregset_t));
}

void
fill_fpregset (const struct regcache *regcache, gdb_fpregset_t *fpregset,
	       int regnum)
{
  loongarch_fpregset.collect_regset (nullptr, regcache, regnum, fpregset,
				     sizeof (gdb_fpregset_t));
}

/* Initialize LoongArch Linux native support.  */

void _initialize_loongarch_linux_nat ();
void
_initialize_loongarch_linux_nat ()
{
  linux_target = &the_loongarch_linux_nat_target;
  add_inf_child_target (&the_loongarch_linux_nat_target);
}