1 /* Native-dependent code for FreeBSD/mips.
2
3 Copyright (C) 2017-2024 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 "inferior.h"
21 #include "regcache.h"
22 #include "target.h"
23
24 #include <sys/types.h>
25 #include <sys/ptrace.h>
26 #include <machine/reg.h>
27
28 #include "fbsd-nat.h"
29 #include "mips-tdep.h"
30 #include "mips-fbsd-tdep.h"
31 #include "inf-ptrace.h"
32
33 struct mips_fbsd_nat_target final : public fbsd_nat_target
34 {
35 void fetch_registers (struct regcache *, int) override;
36 void store_registers (struct regcache *, int) override;
37 };
38
39 static mips_fbsd_nat_target the_mips_fbsd_nat_target;
40
41 /* Determine if PT_GETREGS fetches REGNUM. */
42
43 static bool
getregs_supplies(struct gdbarch * gdbarch,int regnum)44 getregs_supplies (struct gdbarch *gdbarch, int regnum)
45 {
46 return (regnum >= MIPS_ZERO_REGNUM
47 && regnum <= mips_regnum (gdbarch)->pc);
48 }
49
50 /* Determine if PT_GETFPREGS fetches REGNUM. */
51
52 static bool
getfpregs_supplies(struct gdbarch * gdbarch,int regnum)53 getfpregs_supplies (struct gdbarch *gdbarch, int regnum)
54 {
55 return (regnum >= mips_regnum (gdbarch)->fp0
56 && regnum <= mips_regnum (gdbarch)->fp_implementation_revision);
57 }
58
59 /* Fetch register REGNUM from the inferior. If REGNUM is -1, do this
60 for all registers. */
61
62 void
fetch_registers(struct regcache * regcache,int regnum)63 mips_fbsd_nat_target::fetch_registers (struct regcache *regcache, int regnum)
64 {
65 pid_t pid = get_ptrace_pid (regcache->ptid ());
66
67 struct gdbarch *gdbarch = regcache->arch ();
68 if (regnum == -1 || getregs_supplies (gdbarch, regnum))
69 {
70 struct reg regs;
71
72 if (ptrace (PT_GETREGS, pid, (PTRACE_TYPE_ARG3) ®s, 0) == -1)
73 perror_with_name (_("Couldn't get registers"));
74
75 mips_fbsd_supply_gregs (regcache, regnum, ®s, sizeof (register_t));
76 }
77
78 if (regnum == -1 || getfpregs_supplies (gdbarch, regnum))
79 {
80 struct fpreg fpregs;
81
82 if (ptrace (PT_GETFPREGS, pid, (PTRACE_TYPE_ARG3) &fpregs, 0) == -1)
83 perror_with_name (_("Couldn't get floating point status"));
84
85 mips_fbsd_supply_fpregs (regcache, regnum, &fpregs,
86 sizeof (f_register_t));
87 }
88 }
89
90 /* Store register REGNUM back into the inferior. If REGNUM is -1, do
91 this for all registers. */
92
93 void
store_registers(struct regcache * regcache,int regnum)94 mips_fbsd_nat_target::store_registers (struct regcache *regcache, int regnum)
95 {
96 pid_t pid = get_ptrace_pid (regcache->ptid ());
97
98 struct gdbarch *gdbarch = regcache->arch ();
99 if (regnum == -1 || getregs_supplies (gdbarch, regnum))
100 {
101 struct reg regs;
102
103 if (ptrace (PT_GETREGS, pid, (PTRACE_TYPE_ARG3) ®s, 0) == -1)
104 perror_with_name (_("Couldn't get registers"));
105
106 mips_fbsd_collect_gregs (regcache, regnum, (char *) ®s,
107 sizeof (register_t));
108
109 if (ptrace (PT_SETREGS, pid, (PTRACE_TYPE_ARG3) ®s, 0) == -1)
110 perror_with_name (_("Couldn't write registers"));
111 }
112
113 if (regnum == -1 || getfpregs_supplies (gdbarch, regnum))
114 {
115 struct fpreg fpregs;
116
117 if (ptrace (PT_GETFPREGS, pid, (PTRACE_TYPE_ARG3) &fpregs, 0) == -1)
118 perror_with_name (_("Couldn't get floating point status"));
119
120 mips_fbsd_collect_fpregs (regcache, regnum, (char *) &fpregs,
121 sizeof (f_register_t));
122
123 if (ptrace (PT_SETFPREGS, pid, (PTRACE_TYPE_ARG3) &fpregs, 0) == -1)
124 perror_with_name (_("Couldn't write floating point status"));
125 }
126 }
127
128 void _initialize_mips_fbsd_nat ();
129 void
_initialize_mips_fbsd_nat()130 _initialize_mips_fbsd_nat ()
131 {
132 add_inf_child_target (&the_mips_fbsd_nat_target);
133 }
134