1 /* Native-dependent code for NetBSD/riscv.
2
3 Copyright (C) 2018-2020 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 "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 "netbsd-nat.h"
29 #include "riscv-tdep.h"
30 #include "riscv-netbsd-tdep.h"
31 #include "inf-ptrace.h"
32
33 struct riscv_nbsd_nat_target final : public nbsd_nat_target
34 {
35 void fetch_registers (struct regcache *, int) override;
36 void store_registers (struct regcache *, int) override;
37 };
38
39 static riscv_nbsd_nat_target the_riscv_nbsd_nat_target;
40
41 /* Determine if PT_GETREGS fetches REGNUM. */
42
43 static bool
getregs_supplies(int regnum)44 getregs_supplies (int regnum)
45 {
46 return regnum >= RISCV_RA_REGNUM && regnum <= RISCV_PC_REGNUM;
47 }
48
49 /* Determine if PT_GETFPREGS fetches REGNUM. */
50
51 static bool
getfpregs_supplies(int regnum)52 getfpregs_supplies (int regnum)
53 {
54 return ((regnum >= RISCV_FIRST_FP_REGNUM && regnum <= RISCV_LAST_FP_REGNUM)
55 || regnum == RISCV_CSR_FCSR_REGNUM);
56 }
57
58 /* Fetch register REGNUM from the inferior. If REGNUM is -1, do this
59 for all registers. */
60
61 void
fetch_registers(struct regcache * regcache,int regnum)62 riscv_nbsd_nat_target::fetch_registers (struct regcache *regcache,
63 int regnum)
64 {
65 pid_t pid = regcache->ptid ().pid ();
66 int lwp = regcache->ptid ().lwp ();
67
68 if (regnum == -1 || regnum == RISCV_ZERO_REGNUM)
69 regcache->raw_supply_zeroed (RISCV_ZERO_REGNUM);
70 if (regnum == -1 || getregs_supplies (regnum))
71 {
72 struct reg regs;
73
74 if (ptrace (PT_GETREGS, pid, (PTRACE_TYPE_ARG3) ®s, lwp) == -1)
75 perror_with_name (_("Couldn't get registers"));
76
77 regcache->supply_regset (&riscv_nbsd_gregset, regnum, ®s,
78 sizeof (regs));
79 }
80
81 if (regnum == -1 || getfpregs_supplies (regnum))
82 {
83 struct fpreg fpregs;
84
85 if (ptrace (PT_GETFPREGS, pid, (PTRACE_TYPE_ARG3) &fpregs, 0) == -1)
86 perror_with_name (_("Couldn't get floating point status"));
87
88 regcache->supply_regset (&riscv_nbsd_fpregset, regnum, &fpregs,
89 sizeof (fpregs));
90 }
91 }
92
93 /* Store register REGNUM back into the inferior. If REGNUM is -1, do
94 this for all registers. */
95
96 void
store_registers(struct regcache * regcache,int regnum)97 riscv_nbsd_nat_target::store_registers (struct regcache *regcache,
98 int regnum)
99 {
100 pid_t pid = regcache->ptid ().pid ();
101 int lwp = regcache->ptid ().lwp ();
102
103 if (regnum == -1 || getregs_supplies (regnum))
104 {
105 struct reg regs;
106
107 if (ptrace (PT_GETREGS, pid, (PTRACE_TYPE_ARG3) ®s, lwp) == -1)
108 perror_with_name (_("Couldn't get registers"));
109
110 regcache->collect_regset (&riscv_nbsd_gregset, regnum, ®s,
111 sizeof (regs));
112
113 if (ptrace (PT_SETREGS, pid, (PTRACE_TYPE_ARG3) ®s, lwp) == -1)
114 perror_with_name (_("Couldn't write registers"));
115 }
116
117 if (regnum == -1 || getfpregs_supplies (regnum))
118 {
119 struct fpreg fpregs;
120
121 if (ptrace (PT_GETFPREGS, pid, (PTRACE_TYPE_ARG3) &fpregs, lwp) == -1)
122 perror_with_name (_("Couldn't get floating point status"));
123
124 regcache->collect_regset (&riscv_nbsd_fpregset, regnum, &fpregs,
125 sizeof (fpregs));
126
127 if (ptrace (PT_SETFPREGS, pid, (PTRACE_TYPE_ARG3) &fpregs, lwp) == -1)
128 perror_with_name (_("Couldn't write floating point status"));
129 }
130 }
131
132 /* Initialize RISC-V NetBSD native support. */
133
134 void _initialize_riscv_nbsd_nat ();
135 void
_initialize_riscv_nbsd_nat()136 _initialize_riscv_nbsd_nat ()
137 {
138 add_inf_child_target (&the_riscv_nbsd_nat_target);
139
140 // bsd_kvm_add_target (riscv_nbsd_supply_pcb);
141 }
142