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0a30fbc4 | 1 | /* GNU/Linux/ARM specific low level interface, for the remote server for GDB. |
9308fc88 | 2 | Copyright (C) 1995, 1996, 1998, 1999, 2000, 2001, 2002, 2003, 2004, 2005, |
4c38e0a4 | 3 | 2006, 2007, 2008, 2009, 2010 Free Software Foundation, Inc. |
0a30fbc4 DJ |
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 |
0a30fbc4 DJ |
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/>. */ |
0a30fbc4 DJ |
19 | |
20 | #include "server.h" | |
58caa3dc | 21 | #include "linux-low.h" |
0a30fbc4 | 22 | |
58d6951d | 23 | #include <elf.h> |
9308fc88 DJ |
24 | #include <sys/ptrace.h> |
25 | ||
26 | #include "gdb_proc_service.h" | |
27 | ||
58d6951d | 28 | /* Defined in auto-generated files. */ |
d05b4ac3 | 29 | void init_registers_arm (void); |
d05b4ac3 | 30 | void init_registers_arm_with_iwmmxt (void); |
58d6951d DJ |
31 | void init_registers_arm_with_vfpv2 (void); |
32 | void init_registers_arm_with_vfpv3 (void); | |
33 | void init_registers_arm_with_neon (void); | |
d05b4ac3 | 34 | |
9308fc88 DJ |
35 | #ifndef PTRACE_GET_THREAD_AREA |
36 | #define PTRACE_GET_THREAD_AREA 22 | |
37 | #endif | |
38 | ||
fb1e4ffc DJ |
39 | #ifndef PTRACE_GETWMMXREGS |
40 | # define PTRACE_GETWMMXREGS 18 | |
41 | # define PTRACE_SETWMMXREGS 19 | |
42 | #endif | |
43 | ||
58d6951d DJ |
44 | #ifndef PTRACE_GETVFPREGS |
45 | # define PTRACE_GETVFPREGS 27 | |
46 | # define PTRACE_SETVFPREGS 28 | |
47 | #endif | |
48 | ||
49 | static unsigned long arm_hwcap; | |
50 | ||
51 | /* These are in <asm/elf.h> in current kernels. */ | |
52 | #define HWCAP_VFP 64 | |
53 | #define HWCAP_IWMMXT 512 | |
54 | #define HWCAP_NEON 4096 | |
55 | #define HWCAP_VFPv3 8192 | |
56 | #define HWCAP_VFPv3D16 16384 | |
57 | ||
0a30fbc4 DJ |
58 | #ifdef HAVE_SYS_REG_H |
59 | #include <sys/reg.h> | |
60 | #endif | |
61 | ||
23ce3b1c | 62 | #define arm_num_regs 26 |
0a30fbc4 | 63 | |
2ec06d2e | 64 | static int arm_regmap[] = { |
0a30fbc4 DJ |
65 | 0, 4, 8, 12, 16, 20, 24, 28, |
66 | 32, 36, 40, 44, 48, 52, 56, 60, | |
23ce3b1c DJ |
67 | -1, -1, -1, -1, -1, -1, -1, -1, -1, |
68 | 64 | |
0a30fbc4 DJ |
69 | }; |
70 | ||
2ec06d2e DJ |
71 | static int |
72 | arm_cannot_store_register (int regno) | |
0a30fbc4 | 73 | { |
2ec06d2e | 74 | return (regno >= arm_num_regs); |
0a30fbc4 DJ |
75 | } |
76 | ||
2ec06d2e DJ |
77 | static int |
78 | arm_cannot_fetch_register (int regno) | |
0a30fbc4 | 79 | { |
2ec06d2e | 80 | return (regno >= arm_num_regs); |
0a30fbc4 DJ |
81 | } |
82 | ||
fb1e4ffc DJ |
83 | static void |
84 | arm_fill_gregset (void *buf) | |
85 | { | |
86 | int i; | |
87 | ||
88 | for (i = 0; i < arm_num_regs; i++) | |
89 | if (arm_regmap[i] != -1) | |
90 | collect_register (i, ((char *) buf) + arm_regmap[i]); | |
91 | } | |
92 | ||
93 | static void | |
94 | arm_store_gregset (const void *buf) | |
95 | { | |
96 | int i; | |
97 | char zerobuf[8]; | |
98 | ||
99 | memset (zerobuf, 0, 8); | |
100 | for (i = 0; i < arm_num_regs; i++) | |
101 | if (arm_regmap[i] != -1) | |
102 | supply_register (i, ((char *) buf) + arm_regmap[i]); | |
103 | else | |
104 | supply_register (i, zerobuf); | |
105 | } | |
106 | ||
fb1e4ffc DJ |
107 | static void |
108 | arm_fill_wmmxregset (void *buf) | |
109 | { | |
110 | int i; | |
111 | ||
58d6951d DJ |
112 | if (!(arm_hwcap & HWCAP_IWMMXT)) |
113 | return; | |
114 | ||
fb1e4ffc DJ |
115 | for (i = 0; i < 16; i++) |
116 | collect_register (arm_num_regs + i, (char *) buf + i * 8); | |
117 | ||
118 | /* We only have access to wcssf, wcasf, and wcgr0-wcgr3. */ | |
119 | for (i = 0; i < 6; i++) | |
120 | collect_register (arm_num_regs + i + 16, (char *) buf + 16 * 8 + i * 4); | |
121 | } | |
122 | ||
123 | static void | |
124 | arm_store_wmmxregset (const void *buf) | |
125 | { | |
126 | int i; | |
127 | ||
58d6951d DJ |
128 | if (!(arm_hwcap & HWCAP_IWMMXT)) |
129 | return; | |
130 | ||
fb1e4ffc DJ |
131 | for (i = 0; i < 16; i++) |
132 | supply_register (arm_num_regs + i, (char *) buf + i * 8); | |
133 | ||
134 | /* We only have access to wcssf, wcasf, and wcgr0-wcgr3. */ | |
135 | for (i = 0; i < 6; i++) | |
136 | supply_register (arm_num_regs + i + 16, (char *) buf + 16 * 8 + i * 4); | |
137 | } | |
138 | ||
58d6951d DJ |
139 | static void |
140 | arm_fill_vfpregset (void *buf) | |
141 | { | |
142 | int i, num, base; | |
143 | ||
144 | if (!(arm_hwcap & HWCAP_VFP)) | |
145 | return; | |
146 | ||
147 | if ((arm_hwcap & (HWCAP_VFPv3 | HWCAP_VFPv3D16)) == HWCAP_VFPv3) | |
148 | num = 32; | |
149 | else | |
150 | num = 16; | |
151 | ||
152 | base = find_regno ("d0"); | |
153 | for (i = 0; i < num; i++) | |
154 | collect_register (base + i, (char *) buf + i * 8); | |
155 | ||
156 | collect_register_by_name ("fpscr", (char *) buf + 32 * 8); | |
157 | } | |
158 | ||
159 | static void | |
160 | arm_store_vfpregset (const void *buf) | |
161 | { | |
162 | int i, num, base; | |
163 | ||
164 | if (!(arm_hwcap & HWCAP_VFP)) | |
165 | return; | |
166 | ||
167 | if ((arm_hwcap & (HWCAP_VFPv3 | HWCAP_VFPv3D16)) == HWCAP_VFPv3) | |
168 | num = 32; | |
169 | else | |
170 | num = 16; | |
171 | ||
172 | base = find_regno ("d0"); | |
173 | for (i = 0; i < num; i++) | |
174 | supply_register (base + i, (char *) buf + i * 8); | |
175 | ||
176 | supply_register_by_name ("fpscr", (char *) buf + 32 * 8); | |
177 | } | |
fb1e4ffc | 178 | |
d677d77d DJ |
179 | extern int debug_threads; |
180 | ||
0d62e5e8 DJ |
181 | static CORE_ADDR |
182 | arm_get_pc () | |
183 | { | |
184 | unsigned long pc; | |
185 | collect_register_by_name ("pc", &pc); | |
d677d77d DJ |
186 | if (debug_threads) |
187 | fprintf (stderr, "stop pc is %08lx\n", pc); | |
0d62e5e8 DJ |
188 | return pc; |
189 | } | |
190 | ||
191 | static void | |
192 | arm_set_pc (CORE_ADDR pc) | |
193 | { | |
194 | unsigned long newpc = pc; | |
195 | supply_register_by_name ("pc", &newpc); | |
196 | } | |
197 | ||
aeb75bf5 | 198 | /* Correct in either endianness. */ |
0d62e5e8 DJ |
199 | static const unsigned long arm_breakpoint = 0xef9f0001; |
200 | #define arm_breakpoint_len 4 | |
aeb75bf5 DJ |
201 | static const unsigned short thumb_breakpoint = 0xde01; |
202 | #define thumb_breakpoint_len 2 | |
0d62e5e8 | 203 | |
9d1fb177 DJ |
204 | /* For new EABI binaries. We recognize it regardless of which ABI |
205 | is used for gdbserver, so single threaded debugging should work | |
206 | OK, but for multi-threaded debugging we only insert the current | |
207 | ABI's breakpoint instruction. For now at least. */ | |
208 | static const unsigned long arm_eabi_breakpoint = 0xe7f001f0; | |
209 | ||
0d62e5e8 DJ |
210 | static int |
211 | arm_breakpoint_at (CORE_ADDR where) | |
212 | { | |
aeb75bf5 | 213 | unsigned long cpsr; |
0d62e5e8 | 214 | |
aeb75bf5 | 215 | collect_register_by_name ("cpsr", &cpsr); |
0d62e5e8 | 216 | |
aeb75bf5 DJ |
217 | if (cpsr & 0x20) |
218 | { | |
219 | /* Thumb mode. */ | |
220 | unsigned short insn; | |
9d1fb177 | 221 | |
aeb75bf5 DJ |
222 | (*the_target->read_memory) (where, (unsigned char *) &insn, 2); |
223 | if (insn == thumb_breakpoint) | |
224 | return 1; | |
225 | } | |
226 | else | |
227 | { | |
228 | /* ARM mode. */ | |
229 | unsigned long insn; | |
230 | ||
231 | (*the_target->read_memory) (where, (unsigned char *) &insn, 4); | |
232 | if (insn == arm_breakpoint) | |
233 | return 1; | |
234 | ||
235 | if (insn == arm_eabi_breakpoint) | |
236 | return 1; | |
237 | } | |
9d1fb177 | 238 | |
0d62e5e8 DJ |
239 | return 0; |
240 | } | |
241 | ||
3b2fc2ea DJ |
242 | /* We only place breakpoints in empty marker functions, and thread locking |
243 | is outside of the function. So rather than importing software single-step, | |
244 | we can just run until exit. */ | |
245 | static CORE_ADDR | |
246 | arm_reinsert_addr () | |
247 | { | |
248 | unsigned long pc; | |
249 | collect_register_by_name ("lr", &pc); | |
250 | return pc; | |
251 | } | |
252 | ||
9308fc88 DJ |
253 | /* Fetch the thread-local storage pointer for libthread_db. */ |
254 | ||
255 | ps_err_e | |
256 | ps_get_thread_area (const struct ps_prochandle *ph, | |
1b3f6016 | 257 | lwpid_t lwpid, int idx, void **base) |
9308fc88 DJ |
258 | { |
259 | if (ptrace (PTRACE_GET_THREAD_AREA, lwpid, NULL, base) != 0) | |
260 | return PS_ERR; | |
261 | ||
262 | /* IDX is the bias from the thread pointer to the beginning of the | |
263 | thread descriptor. It has to be subtracted due to implementation | |
264 | quirks in libthread_db. */ | |
265 | *base = (void *) ((char *)*base - idx); | |
266 | ||
267 | return PS_OK; | |
268 | } | |
269 | ||
58d6951d DJ |
270 | static int |
271 | arm_get_hwcap (unsigned long *valp) | |
272 | { | |
273 | unsigned char *data = alloca (8); | |
274 | int offset = 0; | |
275 | ||
276 | while ((*the_target->read_auxv) (offset, data, 8) == 8) | |
277 | { | |
278 | unsigned int *data_p = (unsigned int *)data; | |
279 | if (data_p[0] == AT_HWCAP) | |
280 | { | |
281 | *valp = data_p[1]; | |
282 | return 1; | |
283 | } | |
284 | ||
285 | offset += 8; | |
286 | } | |
287 | ||
288 | *valp = 0; | |
289 | return 0; | |
290 | } | |
291 | ||
292 | static void | |
293 | arm_arch_setup (void) | |
294 | { | |
295 | arm_hwcap = 0; | |
296 | if (arm_get_hwcap (&arm_hwcap) == 0) | |
297 | { | |
298 | init_registers_arm (); | |
299 | return; | |
300 | } | |
301 | ||
302 | if (arm_hwcap & HWCAP_IWMMXT) | |
303 | { | |
304 | init_registers_arm_with_iwmmxt (); | |
305 | return; | |
306 | } | |
307 | ||
308 | if (arm_hwcap & HWCAP_VFP) | |
309 | { | |
310 | int pid; | |
311 | char *buf; | |
312 | ||
313 | /* NEON implies either no VFP, or VFPv3-D32. We only support | |
314 | it with VFP. */ | |
315 | if (arm_hwcap & HWCAP_NEON) | |
316 | init_registers_arm_with_neon (); | |
317 | else if ((arm_hwcap & (HWCAP_VFPv3 | HWCAP_VFPv3D16)) == HWCAP_VFPv3) | |
318 | init_registers_arm_with_vfpv3 (); | |
319 | else | |
320 | init_registers_arm_with_vfpv2 (); | |
321 | ||
322 | /* Now make sure that the kernel supports reading these | |
323 | registers. Support was added in 2.6.30. */ | |
324 | pid = lwpid_of (get_thread_lwp (current_inferior)); | |
325 | errno = 0; | |
326 | buf = malloc (32 * 8 + 4); | |
327 | if (ptrace (PTRACE_GETVFPREGS, pid, 0, buf) < 0 | |
328 | && errno == EIO) | |
329 | { | |
330 | arm_hwcap = 0; | |
331 | init_registers_arm (); | |
332 | } | |
333 | free (buf); | |
334 | ||
335 | return; | |
336 | } | |
337 | ||
338 | /* The default configuration uses legacy FPA registers, probably | |
339 | simulated. */ | |
340 | init_registers_arm (); | |
341 | } | |
342 | ||
fb1e4ffc DJ |
343 | struct regset_info target_regsets[] = { |
344 | { PTRACE_GETREGS, PTRACE_SETREGS, 18 * 4, | |
345 | GENERAL_REGS, | |
346 | arm_fill_gregset, arm_store_gregset }, | |
fb1e4ffc DJ |
347 | { PTRACE_GETWMMXREGS, PTRACE_SETWMMXREGS, 16 * 8 + 6 * 4, |
348 | EXTENDED_REGS, | |
349 | arm_fill_wmmxregset, arm_store_wmmxregset }, | |
58d6951d DJ |
350 | { PTRACE_GETVFPREGS, PTRACE_SETVFPREGS, 32 * 8 + 4, |
351 | EXTENDED_REGS, | |
352 | arm_fill_vfpregset, arm_store_vfpregset }, | |
fb1e4ffc DJ |
353 | { 0, 0, -1, -1, NULL, NULL } |
354 | }; | |
355 | ||
2ec06d2e | 356 | struct linux_target_ops the_low_target = { |
58d6951d | 357 | arm_arch_setup, |
2ec06d2e DJ |
358 | arm_num_regs, |
359 | arm_regmap, | |
360 | arm_cannot_fetch_register, | |
361 | arm_cannot_store_register, | |
0d62e5e8 DJ |
362 | arm_get_pc, |
363 | arm_set_pc, | |
aeb75bf5 DJ |
364 | |
365 | /* Define an ARM-mode breakpoint; we only set breakpoints in the C | |
366 | library, which is most likely to be ARM. If the kernel supports | |
367 | clone events, we will never insert a breakpoint, so even a Thumb | |
368 | C library will work; so will mixing EABI/non-EABI gdbserver and | |
369 | application. */ | |
9d1fb177 | 370 | #ifndef __ARM_EABI__ |
f450004a | 371 | (const unsigned char *) &arm_breakpoint, |
9d1fb177 DJ |
372 | #else |
373 | (const unsigned char *) &arm_eabi_breakpoint, | |
374 | #endif | |
0d62e5e8 | 375 | arm_breakpoint_len, |
3b2fc2ea | 376 | arm_reinsert_addr, |
0d62e5e8 DJ |
377 | 0, |
378 | arm_breakpoint_at, | |
2ec06d2e | 379 | }; |