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a45b1e66 | 1 | /* Native-dependent code for GNU/Linux OpenRISC. |
4a94e368 | 2 | Copyright (C) 2021-2022 Free Software Foundation, Inc. |
a45b1e66 SH |
3 | |
4 | This file is part of GDB. | |
5 | ||
6 | This program is free software; you can redistribute it and/or modify | |
7 | it under the terms of the GNU General Public License as published by | |
8 | the Free Software Foundation; either version 3 of the License, or | |
9 | (at your option) any later version. | |
10 | ||
11 | This program is distributed in the hope that it will be useful, | |
12 | but WITHOUT ANY WARRANTY; without even the implied warranty of | |
13 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
14 | GNU General Public License for more details. | |
15 | ||
16 | You should have received a copy of the GNU General Public License | |
17 | along with this program. If not, see <http://www.gnu.org/licenses/>. */ | |
18 | ||
19 | #include "defs.h" | |
20 | #include "regcache.h" | |
21 | #include "gregset.h" | |
22 | #include "linux-nat.h" | |
23 | #include "or1k-tdep.h" | |
24 | #include "or1k-linux-tdep.h" | |
25 | #include "inferior.h" | |
26 | ||
27 | #include "elf/common.h" | |
28 | ||
29 | #include <sys/ptrace.h> | |
30 | ||
31 | /* OpenRISC Linux native additions to the default linux support. */ | |
32 | ||
33 | class or1k_linux_nat_target final : public linux_nat_target | |
34 | { | |
35 | public: | |
36 | /* Add our register access methods. */ | |
37 | void fetch_registers (struct regcache *regcache, int regnum) override; | |
38 | void store_registers (struct regcache *regcache, int regnum) override; | |
39 | ||
40 | /* Read suitable target description. */ | |
41 | const struct target_desc *read_description () override; | |
42 | }; | |
43 | ||
44 | static or1k_linux_nat_target the_or1k_linux_nat_target; | |
45 | ||
46 | /* Copy general purpose register REGNUM (or all gp regs if REGNUM == -1) | |
47 | from regset GREGS into REGCACHE. */ | |
48 | ||
49 | static void | |
50 | supply_gregset_regnum (struct regcache *regcache, const prgregset_t *gregs, | |
51 | int regnum) | |
52 | { | |
53 | int i; | |
54 | const elf_greg_t *regp = *gregs; | |
55 | ||
56 | /* Access all registers */ | |
57 | if (regnum == -1) | |
58 | { | |
59 | /* We fill the general purpose registers. */ | |
60 | for (i = OR1K_ZERO_REGNUM + 1; i < OR1K_MAX_GPR_REGS; i++) | |
61 | regcache->raw_supply (i, regp + i); | |
62 | ||
63 | /* Supply OR1K_NPC_REGNUM from index 32. */ | |
64 | regcache->raw_supply (OR1K_NPC_REGNUM, regp + 32); | |
65 | ||
66 | /* Fill the inaccessible zero register with zero. */ | |
67 | regcache->raw_supply_zeroed (0); | |
68 | } | |
69 | else if (regnum == OR1K_ZERO_REGNUM) | |
70 | regcache->raw_supply_zeroed (0); | |
71 | else if (regnum == OR1K_NPC_REGNUM) | |
72 | regcache->raw_supply (OR1K_NPC_REGNUM, regp + 32); | |
73 | else if (regnum > OR1K_ZERO_REGNUM && regnum < OR1K_MAX_GPR_REGS) | |
74 | regcache->raw_supply (regnum, regp + regnum); | |
75 | } | |
76 | ||
77 | /* Copy all general purpose registers from regset GREGS into REGCACHE. */ | |
78 | ||
79 | void | |
80 | supply_gregset (struct regcache *regcache, const prgregset_t *gregs) | |
81 | { | |
82 | supply_gregset_regnum (regcache, gregs, -1); | |
83 | } | |
84 | ||
85 | /* Copy general purpose register REGNUM (or all gp regs if REGNUM == -1) | |
86 | from REGCACHE into regset GREGS. */ | |
87 | ||
88 | void | |
89 | fill_gregset (const struct regcache *regcache, prgregset_t *gregs, int regnum) | |
90 | { | |
91 | elf_greg_t *regp = *gregs; | |
92 | ||
93 | if (regnum == -1) | |
94 | { | |
95 | /* We fill the general purpose registers. */ | |
96 | for (int i = OR1K_ZERO_REGNUM + 1; i < OR1K_MAX_GPR_REGS; i++) | |
97 | regcache->raw_collect (i, regp + i); | |
98 | ||
99 | regcache->raw_collect (OR1K_NPC_REGNUM, regp + 32); | |
100 | } | |
101 | else if (regnum == OR1K_ZERO_REGNUM) | |
102 | /* Nothing to do here. */ | |
103 | ; | |
104 | else if (regnum > OR1K_ZERO_REGNUM && regnum < OR1K_MAX_GPR_REGS) | |
105 | regcache->raw_collect (regnum, regp + regnum); | |
106 | else if (regnum == OR1K_NPC_REGNUM) | |
107 | regcache->raw_collect (OR1K_NPC_REGNUM, regp + 32); | |
108 | } | |
109 | ||
110 | /* Transfering floating-point registers between GDB, inferiors and cores. | |
111 | Since OpenRISC floating-point registers are the same as GPRs these do | |
112 | nothing. */ | |
113 | ||
114 | void | |
115 | supply_fpregset (struct regcache *regcache, const gdb_fpregset_t *fpregs) | |
116 | { | |
117 | } | |
118 | ||
119 | void | |
120 | fill_fpregset (const struct regcache *regcache, | |
121 | gdb_fpregset_t *fpregs, int regno) | |
122 | { | |
123 | } | |
124 | ||
125 | /* Return a target description for the current target. */ | |
126 | ||
127 | const struct target_desc * | |
128 | or1k_linux_nat_target::read_description () | |
129 | { | |
130 | return tdesc_or1k_linux; | |
131 | } | |
132 | ||
133 | /* Fetch REGNUM (or all registers if REGNUM == -1) from the target | |
134 | into REGCACHE using PTRACE_GETREGSET. */ | |
135 | ||
136 | void | |
137 | or1k_linux_nat_target::fetch_registers (struct regcache *regcache, int regnum) | |
138 | { | |
139 | int tid; | |
140 | ||
141 | tid = get_ptrace_pid (regcache->ptid()); | |
142 | ||
143 | if ((regnum >= OR1K_ZERO_REGNUM && regnum < OR1K_MAX_GPR_REGS) | |
144 | || (regnum == OR1K_NPC_REGNUM) | |
145 | || (regnum == -1)) | |
146 | { | |
147 | struct iovec iov; | |
148 | elf_gregset_t regs; | |
149 | ||
150 | iov.iov_base = ®s; | |
151 | iov.iov_len = sizeof (regs); | |
152 | ||
153 | if (ptrace (PTRACE_GETREGSET, tid, NT_PRSTATUS, | |
154 | (PTRACE_TYPE_ARG3) &iov) == -1) | |
155 | perror_with_name (_("Couldn't get registers")); | |
156 | else | |
157 | supply_gregset_regnum (regcache, ®s, regnum); | |
158 | } | |
159 | ||
160 | /* Access to other SPRs has potential security issues, don't support them for | |
161 | now. */ | |
162 | } | |
163 | ||
164 | /* Store REGNUM (or all registers if REGNUM == -1) to the target | |
165 | from REGCACHE using PTRACE_SETREGSET. */ | |
166 | ||
167 | void | |
168 | or1k_linux_nat_target::store_registers (struct regcache *regcache, int regnum) | |
169 | { | |
170 | int tid; | |
171 | ||
172 | tid = get_ptrace_pid (regcache->ptid ()); | |
173 | ||
174 | if ((regnum >= OR1K_ZERO_REGNUM && regnum < OR1K_MAX_GPR_REGS) | |
175 | || (regnum == OR1K_NPC_REGNUM) | |
176 | || (regnum == -1)) | |
177 | { | |
178 | struct iovec iov; | |
179 | elf_gregset_t regs; | |
180 | ||
181 | iov.iov_base = ®s; | |
182 | iov.iov_len = sizeof (regs); | |
183 | ||
184 | if (ptrace (PTRACE_GETREGSET, tid, NT_PRSTATUS, | |
185 | (PTRACE_TYPE_ARG3) &iov) == -1) | |
186 | perror_with_name (_("Couldn't get registers")); | |
187 | else | |
188 | { | |
189 | fill_gregset (regcache, ®s, regnum); | |
190 | ||
191 | if (ptrace (PTRACE_SETREGSET, tid, NT_PRSTATUS, | |
192 | (PTRACE_TYPE_ARG3) &iov) == -1) | |
193 | perror_with_name (_("Couldn't set registers")); | |
194 | } | |
195 | } | |
196 | ||
197 | /* Access to SPRs has potential security issues, don't support them for | |
198 | now. */ | |
199 | } | |
200 | ||
201 | /* Initialize OpenRISC Linux native support. */ | |
202 | ||
203 | void _initialize_or1k_linux_nat (); | |
204 | void | |
205 | _initialize_or1k_linux_nat () | |
206 | { | |
207 | /* Register the target. */ | |
208 | linux_target = &the_or1k_linux_nat_target; | |
209 | add_inf_child_target (&the_or1k_linux_nat_target); | |
210 | } |