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74792ff7 JB |
1 | /* Native-dependent code for FreeBSD/riscv. |
2 | ||
42a4f53d | 3 | Copyright (C) 2018-2019 Free Software Foundation, Inc. |
74792ff7 JB |
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 "target.h" | |
22 | ||
23 | #include <sys/types.h> | |
24 | #include <sys/ptrace.h> | |
25 | #include <machine/reg.h> | |
26 | ||
27 | #include "fbsd-nat.h" | |
28 | #include "riscv-tdep.h" | |
29 | #include "riscv-fbsd-tdep.h" | |
30 | #include "inf-ptrace.h" | |
31 | ||
32 | struct riscv_fbsd_nat_target final : public fbsd_nat_target | |
33 | { | |
34 | void fetch_registers (struct regcache *, int) override; | |
35 | void store_registers (struct regcache *, int) override; | |
36 | }; | |
37 | ||
38 | static riscv_fbsd_nat_target the_riscv_fbsd_nat_target; | |
39 | ||
40 | /* Determine if PT_GETREGS fetches REGNUM. */ | |
41 | ||
42 | static bool | |
43 | getregs_supplies (struct gdbarch *gdbarch, int regnum) | |
44 | { | |
bcecc11d JB |
45 | return ((regnum >= RISCV_RA_REGNUM && regnum <= RISCV_PC_REGNUM) |
46 | || regnum == RISCV_CSR_SSTATUS_REGNUM); | |
74792ff7 JB |
47 | } |
48 | ||
49 | /* Determine if PT_GETFPREGS fetches REGNUM. */ | |
50 | ||
51 | static bool | |
52 | getfpregs_supplies (struct gdbarch *gdbarch, 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 | |
62 | riscv_fbsd_nat_target::fetch_registers (struct regcache *regcache, | |
63 | int regnum) | |
64 | { | |
65 | pid_t pid = get_ptrace_pid (regcache->ptid ()); | |
66 | ||
67 | struct gdbarch *gdbarch = regcache->arch (); | |
68 | if (regnum == -1 || regnum == RISCV_ZERO_REGNUM) | |
69 | regcache->raw_supply_zeroed (RISCV_ZERO_REGNUM); | |
70 | if (regnum == -1 || getregs_supplies (gdbarch, regnum)) | |
71 | { | |
72 | struct reg regs; | |
73 | ||
74 | if (ptrace (PT_GETREGS, pid, (PTRACE_TYPE_ARG3) ®s, 0) == -1) | |
75 | perror_with_name (_("Couldn't get registers")); | |
76 | ||
77 | regcache->supply_regset (&riscv_fbsd_gregset, regnum, ®s, | |
78 | sizeof (regs)); | |
79 | } | |
80 | ||
81 | if (regnum == -1 || getfpregs_supplies (gdbarch, 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_fbsd_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 | |
97 | riscv_fbsd_nat_target::store_registers (struct regcache *regcache, | |
98 | int regnum) | |
99 | { | |
100 | pid_t pid = get_ptrace_pid (regcache->ptid ()); | |
101 | ||
102 | struct gdbarch *gdbarch = regcache->arch (); | |
103 | if (regnum == -1 || getregs_supplies (gdbarch, regnum)) | |
104 | { | |
105 | struct reg regs; | |
106 | ||
107 | if (ptrace (PT_GETREGS, pid, (PTRACE_TYPE_ARG3) ®s, 0) == -1) | |
108 | perror_with_name (_("Couldn't get registers")); | |
109 | ||
110 | regcache->collect_regset (&riscv_fbsd_gregset, regnum, ®s, | |
111 | sizeof (regs)); | |
112 | ||
113 | if (ptrace (PT_SETREGS, pid, (PTRACE_TYPE_ARG3) ®s, 0) == -1) | |
114 | perror_with_name (_("Couldn't write registers")); | |
115 | } | |
116 | ||
117 | if (regnum == -1 || getfpregs_supplies (gdbarch, regnum)) | |
118 | { | |
119 | struct fpreg fpregs; | |
120 | ||
121 | if (ptrace (PT_GETFPREGS, pid, (PTRACE_TYPE_ARG3) &fpregs, 0) == -1) | |
122 | perror_with_name (_("Couldn't get floating point status")); | |
123 | ||
124 | regcache->collect_regset (&riscv_fbsd_fpregset, regnum, &fpregs, | |
125 | sizeof (fpregs)); | |
126 | ||
127 | if (ptrace (PT_SETFPREGS, pid, (PTRACE_TYPE_ARG3) &fpregs, 0) == -1) | |
128 | perror_with_name (_("Couldn't write floating point status")); | |
129 | } | |
130 | } | |
131 | ||
132 | void | |
133 | _initialize_riscv_fbsd_nat (void) | |
134 | { | |
135 | add_inf_child_target (&the_riscv_fbsd_nat_target); | |
136 | } |