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1 | /* Native-dependent code for FreeBSD/riscv. |
2 | ||
3 | Copyright (C) 2018 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 "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 | { | |
45 | return (regnum >= RISCV_RA_REGNUM && regnum <= RISCV_PC_REGNUM); | |
46 | } | |
47 | ||
48 | /* Determine if PT_GETFPREGS fetches REGNUM. */ | |
49 | ||
50 | static bool | |
51 | getfpregs_supplies (struct gdbarch *gdbarch, int regnum) | |
52 | { | |
53 | return ((regnum >= RISCV_FIRST_FP_REGNUM && regnum <= RISCV_LAST_FP_REGNUM) | |
54 | || regnum == RISCV_CSR_FCSR_REGNUM); | |
55 | } | |
56 | ||
57 | /* Fetch register REGNUM from the inferior. If REGNUM is -1, do this | |
58 | for all registers. */ | |
59 | ||
60 | void | |
61 | riscv_fbsd_nat_target::fetch_registers (struct regcache *regcache, | |
62 | int regnum) | |
63 | { | |
64 | pid_t pid = get_ptrace_pid (regcache->ptid ()); | |
65 | ||
66 | struct gdbarch *gdbarch = regcache->arch (); | |
67 | if (regnum == -1 || regnum == RISCV_ZERO_REGNUM) | |
68 | regcache->raw_supply_zeroed (RISCV_ZERO_REGNUM); | |
69 | if (regnum == -1 || getregs_supplies (gdbarch, regnum)) | |
70 | { | |
71 | struct reg regs; | |
72 | ||
73 | if (ptrace (PT_GETREGS, pid, (PTRACE_TYPE_ARG3) ®s, 0) == -1) | |
74 | perror_with_name (_("Couldn't get registers")); | |
75 | ||
76 | regcache->supply_regset (&riscv_fbsd_gregset, regnum, ®s, | |
77 | sizeof (regs)); | |
78 | } | |
79 | ||
80 | if (regnum == -1 || getfpregs_supplies (gdbarch, regnum)) | |
81 | { | |
82 | struct fpreg fpregs; | |
83 | ||
84 | if (ptrace (PT_GETFPREGS, pid, (PTRACE_TYPE_ARG3) &fpregs, 0) == -1) | |
85 | perror_with_name (_("Couldn't get floating point status")); | |
86 | ||
87 | regcache->supply_regset (&riscv_fbsd_fpregset, regnum, &fpregs, | |
88 | sizeof (fpregs)); | |
89 | } | |
90 | } | |
91 | ||
92 | /* Store register REGNUM back into the inferior. If REGNUM is -1, do | |
93 | this for all registers. */ | |
94 | ||
95 | void | |
96 | riscv_fbsd_nat_target::store_registers (struct regcache *regcache, | |
97 | int regnum) | |
98 | { | |
99 | pid_t pid = get_ptrace_pid (regcache->ptid ()); | |
100 | ||
101 | struct gdbarch *gdbarch = regcache->arch (); | |
102 | if (regnum == -1 || getregs_supplies (gdbarch, regnum)) | |
103 | { | |
104 | struct reg regs; | |
105 | ||
106 | if (ptrace (PT_GETREGS, pid, (PTRACE_TYPE_ARG3) ®s, 0) == -1) | |
107 | perror_with_name (_("Couldn't get registers")); | |
108 | ||
109 | regcache->collect_regset (&riscv_fbsd_gregset, regnum, ®s, | |
110 | sizeof (regs)); | |
111 | ||
112 | if (ptrace (PT_SETREGS, pid, (PTRACE_TYPE_ARG3) ®s, 0) == -1) | |
113 | perror_with_name (_("Couldn't write registers")); | |
114 | } | |
115 | ||
116 | if (regnum == -1 || getfpregs_supplies (gdbarch, regnum)) | |
117 | { | |
118 | struct fpreg fpregs; | |
119 | ||
120 | if (ptrace (PT_GETFPREGS, pid, (PTRACE_TYPE_ARG3) &fpregs, 0) == -1) | |
121 | perror_with_name (_("Couldn't get floating point status")); | |
122 | ||
123 | regcache->collect_regset (&riscv_fbsd_fpregset, regnum, &fpregs, | |
124 | sizeof (fpregs)); | |
125 | ||
126 | if (ptrace (PT_SETFPREGS, pid, (PTRACE_TYPE_ARG3) &fpregs, 0) == -1) | |
127 | perror_with_name (_("Couldn't write floating point status")); | |
128 | } | |
129 | } | |
130 | ||
131 | void | |
132 | _initialize_riscv_fbsd_nat (void) | |
133 | { | |
134 | add_inf_child_target (&the_riscv_fbsd_nat_target); | |
135 | } |