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9b32d526 KI |
1 | /* Native-dependent code for GNU/Linux m32r. |
2 | ||
1d506c26 | 3 | Copyright (C) 2004-2024 Free Software Foundation, Inc. |
9b32d526 KI |
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 | |
a9762ec7 | 9 | the Free Software Foundation; either version 3 of the License, or |
9b32d526 KI |
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 | |
a9762ec7 | 18 | along with this program. If not, see <http://www.gnu.org/licenses/>. */ |
9b32d526 | 19 | |
9b32d526 KI |
20 | #include "inferior.h" |
21 | #include "gdbcore.h" | |
22 | #include "regcache.h" | |
23 | #include "linux-nat.h" | |
10d6c8cd | 24 | #include "target.h" |
5826e159 | 25 | #include "nat/gdb_ptrace.h" |
9b32d526 KI |
26 | #include <sys/user.h> |
27 | #include <sys/procfs.h> | |
bcc0c096 | 28 | #include "inf-ptrace.h" |
9b32d526 KI |
29 | |
30 | /* Prototypes for supply_gregset etc. */ | |
31 | #include "gregset.h" | |
32 | ||
33 | #include "m32r-tdep.h" | |
34 | \f | |
35 | ||
f6ac5f3d PA |
36 | class m32r_linux_nat_target final : public linux_nat_target |
37 | { | |
38 | public: | |
39 | /* Add our register access methods. */ | |
40 | void fetch_registers (struct regcache *, int) override; | |
41 | void store_registers (struct regcache *, int) override; | |
42 | }; | |
9b32d526 | 43 | |
f6ac5f3d | 44 | static m32r_linux_nat_target the_m32r_linux_nat_target; |
9b32d526 KI |
45 | |
46 | /* Since EVB register is not available for native debug, we reduce | |
47 | the number of registers. */ | |
48 | #define M32R_LINUX_NUM_REGS (M32R_NUM_REGS - 1) | |
49 | ||
50 | /* Mapping between the general-purpose registers in `struct user' | |
51 | format and GDB's register array layout. */ | |
52 | static int regmap[] = { | |
53 | 4, 5, 6, 7, 0, 1, 2, 8, | |
54 | 9, 10, 11, 12, 13, 24, 25, 23, | |
55 | 19, 19, 26, 23, 22, 20, 16, 15 | |
56 | }; | |
57 | ||
58 | #define PSW_REGMAP 19 | |
59 | #define BBPSW_REGMAP 21 | |
60 | #define SPU_REGMAP 23 | |
61 | #define SPI_REGMAP 26 | |
62 | ||
025bb325 MS |
63 | /* Doee (??) apply to the corresponding SET requests as well. */ |
64 | #define GETREGS_SUPPLIES(regno) (0 <= (regno) \ | |
65 | && (regno) <= M32R_LINUX_NUM_REGS) | |
9b32d526 KI |
66 | \f |
67 | ||
68 | ||
69 | /* Transfering the general-purpose registers between GDB, inferiors | |
70 | and core files. */ | |
71 | ||
72 | /* Fill GDB's register array with the general-purpose register values | |
73 | in *GREGSETP. */ | |
74 | ||
75 | void | |
7f7fe91e | 76 | supply_gregset (struct regcache *regcache, const elf_gregset_t * gregsetp) |
9b32d526 | 77 | { |
7f7fe91e | 78 | const elf_greg_t *regp = (const elf_greg_t *) gregsetp; |
9b32d526 KI |
79 | int i; |
80 | unsigned long psw, bbpsw; | |
81 | ||
82 | psw = *(regp + PSW_REGMAP); | |
83 | bbpsw = *(regp + BBPSW_REGMAP); | |
84 | ||
85 | for (i = 0; i < M32R_LINUX_NUM_REGS; i++) | |
86 | { | |
d817e083 UW |
87 | elf_greg_t regval; |
88 | ||
9b32d526 KI |
89 | switch (i) |
90 | { | |
91 | case PSW_REGNUM: | |
d817e083 | 92 | regval = ((0x00c1 & bbpsw) << 8) | ((0xc100 & psw) >> 8); |
9b32d526 KI |
93 | break; |
94 | case CBR_REGNUM: | |
d817e083 UW |
95 | regval = ((psw >> 8) & 1); |
96 | break; | |
97 | default: | |
98 | regval = *(regp + regmap[i]); | |
9b32d526 KI |
99 | break; |
100 | } | |
101 | ||
102 | if (i != M32R_SP_REGNUM) | |
73e1c03f | 103 | regcache->raw_supply (i, ®val); |
9b32d526 | 104 | else if (psw & 0x8000) |
73e1c03f | 105 | regcache->raw_supply (i, regp + SPU_REGMAP); |
9b32d526 | 106 | else |
73e1c03f | 107 | regcache->raw_supply (i, regp + SPI_REGMAP); |
9b32d526 KI |
108 | } |
109 | } | |
110 | ||
111 | /* Fetch all general-purpose registers from process/thread TID and | |
112 | store their values in GDB's register array. */ | |
113 | ||
114 | static void | |
56be3814 | 115 | fetch_regs (struct regcache *regcache, int tid) |
9b32d526 KI |
116 | { |
117 | elf_gregset_t regs; | |
118 | ||
119 | if (ptrace (PTRACE_GETREGS, tid, 0, (int) ®s) < 0) | |
e2e0b3e5 | 120 | perror_with_name (_("Couldn't get registers")); |
9b32d526 | 121 | |
56be3814 | 122 | supply_gregset (regcache, (const elf_gregset_t *) ®s); |
9b32d526 KI |
123 | } |
124 | ||
125 | /* Fill register REGNO (if it is a general-purpose register) in | |
126 | *GREGSETPS with the value in GDB's register array. If REGNO is -1, | |
127 | do this for all registers. */ | |
128 | ||
129 | void | |
7f7fe91e UW |
130 | fill_gregset (const struct regcache *regcache, |
131 | elf_gregset_t * gregsetp, int regno) | |
9b32d526 KI |
132 | { |
133 | elf_greg_t *regp = (elf_greg_t *) gregsetp; | |
134 | int i; | |
135 | unsigned long psw, bbpsw, tmp; | |
136 | ||
137 | psw = *(regp + PSW_REGMAP); | |
138 | bbpsw = *(regp + BBPSW_REGMAP); | |
139 | ||
140 | for (i = 0; i < M32R_LINUX_NUM_REGS; i++) | |
141 | { | |
142 | if (regno != -1 && regno != i) | |
143 | continue; | |
144 | ||
145 | if (i == CBR_REGNUM || i == PSW_REGNUM) | |
146 | continue; | |
147 | ||
148 | if (i == SPU_REGNUM || i == SPI_REGNUM) | |
149 | continue; | |
150 | ||
151 | if (i != M32R_SP_REGNUM) | |
34a79281 | 152 | regcache->raw_collect (i, regp + regmap[i]); |
9b32d526 | 153 | else if (psw & 0x8000) |
34a79281 | 154 | regcache->raw_collect (i, regp + SPU_REGMAP); |
9b32d526 | 155 | else |
34a79281 | 156 | regcache->raw_collect (i, regp + SPI_REGMAP); |
9b32d526 KI |
157 | } |
158 | } | |
159 | ||
160 | /* Store all valid general-purpose registers in GDB's register array | |
161 | into the process/thread specified by TID. */ | |
162 | ||
163 | static void | |
56be3814 | 164 | store_regs (const struct regcache *regcache, int tid, int regno) |
9b32d526 KI |
165 | { |
166 | elf_gregset_t regs; | |
167 | ||
168 | if (ptrace (PTRACE_GETREGS, tid, 0, (int) ®s) < 0) | |
e2e0b3e5 | 169 | perror_with_name (_("Couldn't get registers")); |
9b32d526 | 170 | |
56be3814 | 171 | fill_gregset (regcache, ®s, regno); |
9b32d526 KI |
172 | |
173 | if (ptrace (PTRACE_SETREGS, tid, 0, (int) ®s) < 0) | |
e2e0b3e5 | 174 | perror_with_name (_("Couldn't write registers")); |
9b32d526 KI |
175 | } |
176 | \f | |
177 | ||
178 | ||
179 | /* Transfering floating-point registers between GDB, inferiors and cores. | |
180 | Since M32R has no floating-point registers, these functions do nothing. */ | |
181 | ||
182 | void | |
7f7fe91e | 183 | supply_fpregset (struct regcache *regcache, const gdb_fpregset_t *fpregs) |
9b32d526 KI |
184 | { |
185 | } | |
186 | ||
187 | void | |
7f7fe91e UW |
188 | fill_fpregset (const struct regcache *regcache, |
189 | gdb_fpregset_t *fpregs, int regno) | |
9b32d526 KI |
190 | { |
191 | } | |
192 | \f | |
193 | ||
194 | ||
195 | /* Transferring arbitrary registers between GDB and inferior. */ | |
196 | ||
197 | /* Fetch register REGNO from the child process. If REGNO is -1, do | |
198 | this for all registers (including the floating point and SSE | |
199 | registers). */ | |
200 | ||
f6ac5f3d PA |
201 | void |
202 | m32r_linux_nat_target::fetch_registers (struct regcache *regcache, int regno) | |
9b32d526 | 203 | { |
222312d3 | 204 | pid_t tid = get_ptrace_pid (regcache->ptid ()); |
9b32d526 KI |
205 | |
206 | /* Use the PTRACE_GETREGS request whenever possible, since it | |
207 | transfers more registers in one system call, and we'll cache the | |
208 | results. */ | |
209 | if (regno == -1 || GETREGS_SUPPLIES (regno)) | |
210 | { | |
56be3814 | 211 | fetch_regs (regcache, tid); |
9b32d526 KI |
212 | return; |
213 | } | |
214 | ||
f34652de | 215 | internal_error (_("Got request for bad register number %d."), regno); |
9b32d526 KI |
216 | } |
217 | ||
218 | /* Store register REGNO back into the child process. If REGNO is -1, | |
219 | do this for all registers (including the floating point and SSE | |
220 | registers). */ | |
f6ac5f3d PA |
221 | void |
222 | m32r_linux_nat_target::store_registers (struct regcache *regcache, int regno) | |
9b32d526 | 223 | { |
222312d3 | 224 | pid_t tid = get_ptrace_pid (regcache->ptid ()); |
9b32d526 KI |
225 | |
226 | /* Use the PTRACE_SETREGS request whenever possible, since it | |
227 | transfers more registers in one system call. */ | |
228 | if (regno == -1 || GETREGS_SUPPLIES (regno)) | |
229 | { | |
56be3814 | 230 | store_regs (regcache, tid, regno); |
9b32d526 KI |
231 | return; |
232 | } | |
233 | ||
f34652de | 234 | internal_error (_("Got request to store bad register number %d."), regno); |
9b32d526 | 235 | } |
10d6c8cd | 236 | |
6c265988 | 237 | void _initialize_m32r_linux_nat (); |
10d6c8cd | 238 | void |
6c265988 | 239 | _initialize_m32r_linux_nat () |
10d6c8cd | 240 | { |
10d6c8cd | 241 | /* Register the target. */ |
f6ac5f3d | 242 | linux_target = &the_m32r_linux_nat_target; |
d9f719f1 | 243 | add_inf_child_target (&the_m32r_linux_nat_target); |
10d6c8cd | 244 | } |