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94a0e877 MG |
1 | /* Xtensa GNU/Linux native support. |
2 | ||
61baf725 | 3 | Copyright (C) 2007-2017 Free Software Foundation, Inc. |
94a0e877 MG |
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" | |
94a0e877 MG |
21 | #include "frame.h" |
22 | #include "inferior.h" | |
23 | #include "gdbcore.h" | |
24 | #include "regcache.h" | |
94a0e877 MG |
25 | #include "target.h" |
26 | #include "linux-nat.h" | |
94a0e877 | 27 | #include <sys/types.h> |
94a0e877 MG |
28 | #include <signal.h> |
29 | #include <sys/user.h> | |
30 | #include <sys/ioctl.h> | |
31 | #include "gdb_wait.h" | |
32 | #include <fcntl.h> | |
33 | #include <sys/procfs.h> | |
5826e159 | 34 | #include "nat/gdb_ptrace.h" |
e671835b | 35 | #include <asm/ptrace.h> |
94a0e877 MG |
36 | |
37 | #include "gregset.h" | |
38 | #include "xtensa-tdep.h" | |
39 | ||
40045d91 MF |
40 | /* Defines ps_err_e, struct ps_prochandle. */ |
41 | #include "gdb_proc_service.h" | |
42 | ||
94a0e877 MG |
43 | /* Extended register set depends on hardware configs. |
44 | Keeping these definitions separately allows to introduce | |
45 | hardware-specific overlays. */ | |
46 | #include "xtensa-xtregs.c" | |
47 | ||
94a0e877 MG |
48 | void |
49 | fill_gregset (const struct regcache *regcache, | |
50 | gdb_gregset_t *gregsetp, int regnum) | |
51 | { | |
52 | int i; | |
53 | xtensa_elf_gregset_t *regs = (xtensa_elf_gregset_t *) gregsetp; | |
54 | struct gdbarch *gdbarch = get_regcache_arch (regcache); | |
55 | ||
56 | if (regnum == gdbarch_pc_regnum (gdbarch) || regnum == -1) | |
57 | regcache_raw_collect (regcache, gdbarch_pc_regnum (gdbarch), ®s->pc); | |
58 | if (regnum == gdbarch_ps_regnum (gdbarch) || regnum == -1) | |
59 | regcache_raw_collect (regcache, gdbarch_ps_regnum (gdbarch), ®s->ps); | |
60 | ||
61 | if (regnum == gdbarch_tdep (gdbarch)->wb_regnum || regnum == -1) | |
62 | regcache_raw_collect (regcache, | |
63 | gdbarch_tdep (gdbarch)->wb_regnum, | |
64 | ®s->windowbase); | |
65 | if (regnum == gdbarch_tdep (gdbarch)->ws_regnum || regnum == -1) | |
66 | regcache_raw_collect (regcache, | |
67 | gdbarch_tdep (gdbarch)->ws_regnum, | |
68 | ®s->windowstart); | |
69 | if (regnum == gdbarch_tdep (gdbarch)->lbeg_regnum || regnum == -1) | |
70 | regcache_raw_collect (regcache, | |
71 | gdbarch_tdep (gdbarch)->lbeg_regnum, | |
72 | ®s->lbeg); | |
73 | if (regnum == gdbarch_tdep (gdbarch)->lend_regnum || regnum == -1) | |
74 | regcache_raw_collect (regcache, | |
75 | gdbarch_tdep (gdbarch)->lend_regnum, | |
76 | ®s->lend); | |
77 | if (regnum == gdbarch_tdep (gdbarch)->lcount_regnum || regnum == -1) | |
78 | regcache_raw_collect (regcache, | |
79 | gdbarch_tdep (gdbarch)->lcount_regnum, | |
80 | ®s->lcount); | |
81 | if (regnum == gdbarch_tdep (gdbarch)->sar_regnum || regnum == -1) | |
82 | regcache_raw_collect (regcache, | |
83 | gdbarch_tdep (gdbarch)->sar_regnum, | |
84 | ®s->sar); | |
85 | if (regnum >=gdbarch_tdep (gdbarch)->ar_base | |
86 | && regnum < gdbarch_tdep (gdbarch)->ar_base | |
87 | + gdbarch_tdep (gdbarch)->num_aregs) | |
88 | regcache_raw_collect (regcache,regnum, | |
89 | ®s->ar[regnum - gdbarch_tdep (gdbarch)->ar_base]); | |
90 | else if (regnum == -1) | |
91 | { | |
92 | for (i = 0; i < gdbarch_tdep (gdbarch)->num_aregs; ++i) | |
93 | regcache_raw_collect (regcache, | |
94 | gdbarch_tdep (gdbarch)->ar_base + i, | |
95 | ®s->ar[i]); | |
96 | } | |
97 | } | |
98 | ||
1c215b97 | 99 | static void |
94a0e877 MG |
100 | supply_gregset_reg (struct regcache *regcache, |
101 | const gdb_gregset_t *gregsetp, int regnum) | |
102 | { | |
103 | int i; | |
104 | xtensa_elf_gregset_t *regs = (xtensa_elf_gregset_t *) gregsetp; | |
105 | ||
106 | struct gdbarch *gdbarch = get_regcache_arch (regcache); | |
107 | ||
108 | if (regnum == gdbarch_pc_regnum (gdbarch) || regnum == -1) | |
109 | regcache_raw_supply (regcache, gdbarch_pc_regnum (gdbarch), ®s->pc); | |
110 | if (regnum == gdbarch_ps_regnum (gdbarch) || regnum == -1) | |
111 | regcache_raw_supply (regcache, gdbarch_ps_regnum (gdbarch), ®s->ps); | |
112 | ||
113 | if (regnum == gdbarch_tdep (gdbarch)->wb_regnum || regnum == -1) | |
114 | regcache_raw_supply (regcache, | |
115 | gdbarch_tdep (gdbarch)->wb_regnum, | |
116 | ®s->windowbase); | |
117 | if (regnum == gdbarch_tdep (gdbarch)->ws_regnum || regnum == -1) | |
118 | regcache_raw_supply (regcache, | |
119 | gdbarch_tdep (gdbarch)->ws_regnum, | |
120 | ®s->windowstart); | |
121 | if (regnum == gdbarch_tdep (gdbarch)->lbeg_regnum || regnum == -1) | |
122 | regcache_raw_supply (regcache, | |
123 | gdbarch_tdep (gdbarch)->lbeg_regnum, | |
124 | ®s->lbeg); | |
125 | if (regnum == gdbarch_tdep (gdbarch)->lend_regnum || regnum == -1) | |
126 | regcache_raw_supply (regcache, | |
127 | gdbarch_tdep (gdbarch)->lend_regnum, | |
128 | ®s->lend); | |
129 | if (regnum == gdbarch_tdep (gdbarch)->lcount_regnum || regnum == -1) | |
130 | regcache_raw_supply (regcache, | |
131 | gdbarch_tdep (gdbarch)->lcount_regnum, | |
132 | ®s->lcount); | |
133 | if (regnum == gdbarch_tdep (gdbarch)->sar_regnum || regnum == -1) | |
134 | regcache_raw_supply (regcache, | |
135 | gdbarch_tdep (gdbarch)->sar_regnum, | |
136 | ®s->sar); | |
137 | if (regnum >=gdbarch_tdep (gdbarch)->ar_base | |
138 | && regnum < gdbarch_tdep (gdbarch)->ar_base | |
139 | + gdbarch_tdep (gdbarch)->num_aregs) | |
140 | regcache_raw_supply (regcache,regnum, | |
141 | ®s->ar[regnum - gdbarch_tdep (gdbarch)->ar_base]); | |
142 | else if (regnum == -1) | |
143 | { | |
144 | for (i = 0; i < gdbarch_tdep (gdbarch)->num_aregs; ++i) | |
145 | regcache_raw_supply (regcache, | |
146 | gdbarch_tdep (gdbarch)->ar_base + i, | |
147 | ®s->ar[i]); | |
148 | } | |
149 | } | |
150 | ||
151 | void | |
152 | supply_gregset (struct regcache *regcache, const gdb_gregset_t *gregsetp) | |
153 | { | |
154 | supply_gregset_reg (regcache, gregsetp, -1); | |
155 | } | |
156 | ||
157 | void | |
158 | fill_fpregset (const struct regcache *regcache, | |
159 | gdb_fpregset_t *fpregsetp, int regnum) | |
160 | { | |
161 | return; | |
162 | } | |
163 | ||
164 | void | |
165 | supply_fpregset (struct regcache *regcache, | |
166 | const gdb_fpregset_t *fpregsetp) | |
167 | { | |
168 | return; | |
169 | } | |
170 | ||
171 | /* Fetch greg-register(s) from process/thread TID | |
172 | and store value(s) in GDB's register array. */ | |
173 | ||
174 | static void | |
175 | fetch_gregs (struct regcache *regcache, int regnum) | |
176 | { | |
d89fa914 | 177 | int tid = ptid_get_lwp (inferior_ptid); |
94a0e877 MG |
178 | const gdb_gregset_t regs; |
179 | int areg; | |
180 | ||
181 | if (ptrace (PTRACE_GETREGS, tid, 0, (long) ®s) < 0) | |
182 | { | |
183 | perror_with_name (_("Couldn't get registers")); | |
184 | return; | |
185 | } | |
186 | ||
187 | supply_gregset_reg (regcache, ®s, regnum); | |
188 | } | |
189 | ||
190 | /* Store greg-register(s) in GDB's register | |
191 | array into the process/thread specified by TID. */ | |
192 | ||
193 | static void | |
194 | store_gregs (struct regcache *regcache, int regnum) | |
195 | { | |
d89fa914 | 196 | int tid = ptid_get_lwp (inferior_ptid); |
94a0e877 MG |
197 | gdb_gregset_t regs; |
198 | int areg; | |
199 | ||
200 | if (ptrace (PTRACE_GETREGS, tid, 0, (long) ®s) < 0) | |
201 | { | |
202 | perror_with_name (_("Couldn't get registers")); | |
203 | return; | |
204 | } | |
205 | ||
206 | fill_gregset (regcache, ®s, regnum); | |
207 | ||
208 | if (ptrace (PTRACE_SETREGS, tid, 0, (long) ®s) < 0) | |
209 | { | |
210 | perror_with_name (_("Couldn't write registers")); | |
211 | return; | |
212 | } | |
213 | } | |
214 | ||
215 | static int xtreg_lo; | |
216 | static int xtreg_high; | |
217 | ||
218 | /* Fetch/Store Xtensa TIE registers. Xtensa GNU/Linux PTRACE | |
219 | interface provides special requests for this. */ | |
220 | ||
221 | static void | |
222 | fetch_xtregs (struct regcache *regcache, int regnum) | |
223 | { | |
d89fa914 | 224 | int tid = ptid_get_lwp (inferior_ptid); |
94a0e877 MG |
225 | const xtensa_regtable_t *ptr; |
226 | char xtregs [XTENSA_ELF_XTREG_SIZE]; | |
227 | ||
228 | if (ptrace (PTRACE_GETXTREGS, tid, 0, (long)&xtregs) < 0) | |
229 | perror_with_name (_("Couldn't get extended registers")); | |
230 | ||
231 | for (ptr = xtensa_regmap_table; ptr->name; ptr++) | |
232 | if (regnum == ptr->gdb_regnum || regnum == -1) | |
233 | regcache_raw_supply (regcache, ptr->gdb_regnum, | |
234 | xtregs + ptr->ptrace_offset); | |
235 | } | |
236 | ||
237 | static void | |
238 | store_xtregs (struct regcache *regcache, int regnum) | |
239 | { | |
d89fa914 | 240 | int tid = ptid_get_lwp (inferior_ptid); |
94a0e877 MG |
241 | const xtensa_regtable_t *ptr; |
242 | char xtregs [XTENSA_ELF_XTREG_SIZE]; | |
243 | ||
244 | if (ptrace (PTRACE_GETXTREGS, tid, 0, (long)&xtregs) < 0) | |
245 | perror_with_name (_("Couldn't get extended registers")); | |
246 | ||
247 | for (ptr = xtensa_regmap_table; ptr->name; ptr++) | |
248 | if (regnum == ptr->gdb_regnum || regnum == -1) | |
249 | regcache_raw_collect (regcache, ptr->gdb_regnum, | |
250 | xtregs + ptr->ptrace_offset); | |
251 | ||
252 | if (ptrace (PTRACE_SETXTREGS, tid, 0, (long)&xtregs) < 0) | |
253 | perror_with_name (_("Couldn't write extended registers")); | |
254 | } | |
255 | ||
1c215b97 | 256 | static void |
28439f5e PA |
257 | xtensa_linux_fetch_inferior_registers (struct target_ops *ops, |
258 | struct regcache *regcache, int regnum) | |
94a0e877 MG |
259 | { |
260 | if (regnum == -1) | |
261 | { | |
262 | fetch_gregs (regcache, regnum); | |
263 | fetch_xtregs (regcache, regnum); | |
264 | } | |
265 | else if ((regnum < xtreg_lo) || (regnum > xtreg_high)) | |
266 | fetch_gregs (regcache, regnum); | |
267 | else | |
268 | fetch_xtregs (regcache, regnum); | |
269 | } | |
270 | ||
1c215b97 | 271 | static void |
28439f5e PA |
272 | xtensa_linux_store_inferior_registers (struct target_ops *ops, |
273 | struct regcache *regcache, int regnum) | |
94a0e877 MG |
274 | { |
275 | if (regnum == -1) | |
276 | { | |
277 | store_gregs (regcache, regnum); | |
278 | store_xtregs (regcache, regnum); | |
279 | } | |
280 | else if ((regnum < xtreg_lo) || (regnum > xtreg_high)) | |
281 | store_gregs (regcache, regnum); | |
282 | else | |
283 | store_xtregs (regcache, regnum); | |
284 | } | |
285 | ||
40045d91 MF |
286 | /* Called by libthread_db. */ |
287 | ||
288 | ps_err_e | |
754653a7 | 289 | ps_get_thread_area (struct ps_prochandle *ph, |
40045d91 MF |
290 | lwpid_t lwpid, int idx, void **base) |
291 | { | |
292 | xtensa_elf_gregset_t regs; | |
293 | ||
294 | if (ptrace (PTRACE_GETREGS, lwpid, NULL, ®s) != 0) | |
295 | return PS_ERR; | |
296 | ||
297 | /* IDX is the bias from the thread pointer to the beginning of the | |
298 | thread descriptor. It has to be subtracted due to implementation | |
299 | quirks in libthread_db. */ | |
300 | *base = (void *) ((char *) regs.threadptr - idx); | |
301 | ||
302 | return PS_OK; | |
303 | } | |
304 | ||
94a0e877 MG |
305 | void _initialize_xtensa_linux_nat (void); |
306 | ||
307 | void | |
308 | _initialize_xtensa_linux_nat (void) | |
309 | { | |
310 | struct target_ops *t; | |
311 | const xtensa_regtable_t *ptr; | |
312 | ||
313 | /* Calculate the number range for extended registers. */ | |
314 | xtreg_lo = 1000000000; | |
315 | xtreg_high = -1; | |
316 | for (ptr = xtensa_regmap_table; ptr->name; ptr++) | |
317 | { | |
318 | if (ptr->gdb_regnum < xtreg_lo) | |
319 | xtreg_lo = ptr->gdb_regnum; | |
320 | if (ptr->gdb_regnum > xtreg_high) | |
321 | xtreg_high = ptr->gdb_regnum; | |
322 | } | |
323 | ||
324 | /* Fill in the generic GNU/Linux methods. */ | |
325 | t = linux_target (); | |
326 | ||
327 | /* Add our register access methods. */ | |
328 | t->to_fetch_registers = xtensa_linux_fetch_inferior_registers; | |
329 | t->to_store_registers = xtensa_linux_store_inferior_registers; | |
330 | ||
331 | linux_nat_add_target (t); | |
332 | } |