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bd9e6534 YQ |
1 | /* Copyright (C) 1995-2015 Free Software Foundation, Inc. |
2 | ||
3 | This file is part of GDB. | |
4 | ||
5 | This program is free software; you can redistribute it and/or modify | |
6 | it under the terms of the GNU General Public License as published by | |
7 | the Free Software Foundation; either version 3 of the License, or | |
8 | (at your option) any later version. | |
9 | ||
10 | This program is distributed in the hope that it will be useful, | |
11 | but WITHOUT ANY WARRANTY; without even the implied warranty of | |
12 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
13 | GNU General Public License for more details. | |
14 | ||
15 | You should have received a copy of the GNU General Public License | |
16 | along with this program. If not, see <http://www.gnu.org/licenses/>. */ | |
17 | ||
18 | #include "server.h" | |
19 | #include "arch/arm.h" | |
20 | #include "linux-low.h" | |
21 | #include "linux-aarch32-low.h" | |
22 | ||
23 | #include <sys/ptrace.h> | |
24 | /* Don't include elf.h if linux/elf.h got included by gdb_proc_service.h. | |
25 | On Bionic elf.h and linux/elf.h have conflicting definitions. */ | |
26 | #ifndef ELFMAG0 | |
27 | #include <elf.h> | |
28 | #endif | |
29 | ||
16d5f642 JB |
30 | /* Some older versions of GNU/Linux and Android do not define |
31 | the following macros. */ | |
32 | #ifndef NT_ARM_VFP | |
33 | #define NT_ARM_VFP 0x400 | |
34 | #endif | |
35 | ||
bd9e6534 YQ |
36 | /* Collect GP registers from REGCACHE to buffer BUF. */ |
37 | ||
38 | void | |
39 | arm_fill_gregset (struct regcache *regcache, void *buf) | |
40 | { | |
41 | int i; | |
04248ead | 42 | uint32_t *regs = (uint32_t *) buf; |
bd9e6534 YQ |
43 | |
44 | for (i = ARM_A1_REGNUM; i <= ARM_PC_REGNUM; i++) | |
45 | collect_register (regcache, i, ®s[i]); | |
46 | ||
47 | collect_register (regcache, ARM_PS_REGNUM, ®s[16]); | |
48 | } | |
49 | ||
50 | /* Supply GP registers contents, stored in BUF, to REGCACHE. */ | |
51 | ||
52 | void | |
53 | arm_store_gregset (struct regcache *regcache, const void *buf) | |
54 | { | |
55 | int i; | |
56 | char zerobuf[8]; | |
04248ead | 57 | const uint32_t *regs = (const uint32_t *) buf; |
bd9e6534 YQ |
58 | |
59 | memset (zerobuf, 0, 8); | |
60 | for (i = ARM_A1_REGNUM; i <= ARM_PC_REGNUM; i++) | |
61 | supply_register (regcache, i, ®s[i]); | |
62 | ||
63 | for (; i < ARM_PS_REGNUM; i++) | |
64 | supply_register (regcache, i, zerobuf); | |
65 | ||
66 | supply_register (regcache, ARM_PS_REGNUM, ®s[16]); | |
67 | } | |
68 | ||
69 | /* Collect NUM number of VFP registers from REGCACHE to buffer BUF. */ | |
70 | ||
71 | void | |
72 | arm_fill_vfpregset_num (struct regcache *regcache, void *buf, int num) | |
73 | { | |
74 | int i, base; | |
75 | ||
76 | gdb_assert (num == 16 || num == 32); | |
77 | ||
78 | base = find_regno (regcache->tdesc, "d0"); | |
79 | for (i = 0; i < num; i++) | |
80 | collect_register (regcache, base + i, (char *) buf + i * 8); | |
81 | ||
82 | collect_register_by_name (regcache, "fpscr", (char *) buf + 32 * 8); | |
83 | } | |
84 | ||
85 | /* Supply NUM number of VFP registers contents, stored in BUF, to | |
86 | REGCACHE. */ | |
87 | ||
88 | void | |
89 | arm_store_vfpregset_num (struct regcache *regcache, const void *buf, int num) | |
90 | { | |
91 | int i, base; | |
92 | ||
93 | gdb_assert (num == 16 || num == 32); | |
94 | ||
95 | base = find_regno (regcache->tdesc, "d0"); | |
96 | for (i = 0; i < num; i++) | |
97 | supply_register (regcache, base + i, (char *) buf + i * 8); | |
98 | ||
99 | supply_register_by_name (regcache, "fpscr", (char *) buf + 32 * 8); | |
100 | } | |
101 | ||
102 | static void | |
103 | arm_fill_vfpregset (struct regcache *regcache, void *buf) | |
104 | { | |
105 | arm_fill_vfpregset_num (regcache, buf, 32); | |
106 | } | |
107 | ||
108 | static void | |
109 | arm_store_vfpregset (struct regcache *regcache, const void *buf) | |
110 | { | |
111 | arm_store_vfpregset_num (regcache, buf, 32); | |
112 | } | |
113 | ||
114 | /* Register sets with using PTRACE_GETREGSET. */ | |
115 | ||
116 | static struct regset_info aarch32_regsets[] = { | |
117 | { PTRACE_GETREGSET, PTRACE_SETREGSET, NT_PRSTATUS, 18 * 4, | |
118 | GENERAL_REGS, | |
119 | arm_fill_gregset, arm_store_gregset }, | |
120 | { PTRACE_GETREGSET, PTRACE_SETREGSET, NT_ARM_VFP, 32 * 8 + 4, | |
121 | EXTENDED_REGS, | |
122 | arm_fill_vfpregset, arm_store_vfpregset }, | |
04b3479c | 123 | NULL_REGSET |
bd9e6534 YQ |
124 | }; |
125 | ||
126 | static struct regsets_info aarch32_regsets_info = | |
127 | { | |
128 | aarch32_regsets, /* regsets */ | |
129 | 0, /* num_regsets */ | |
130 | NULL, /* disabled_regsets */ | |
131 | }; | |
132 | ||
133 | struct regs_info regs_info_aarch32 = | |
134 | { | |
135 | NULL, /* regset_bitmap */ | |
136 | NULL, /* usrregs */ | |
137 | &aarch32_regsets_info | |
138 | }; | |
139 | ||
17b1509a YQ |
140 | /* Correct in either endianness. */ |
141 | #define arm_abi_breakpoint 0xef9f0001UL | |
142 | ||
143 | /* For new EABI binaries. We recognize it regardless of which ABI | |
144 | is used for gdbserver, so single threaded debugging should work | |
145 | OK, but for multi-threaded debugging we only insert the current | |
146 | ABI's breakpoint instruction. For now at least. */ | |
147 | #define arm_eabi_breakpoint 0xe7f001f0UL | |
148 | ||
b37a6290 | 149 | #if (defined __ARM_EABI__ || defined __aarch64__) |
17b1509a | 150 | static const unsigned long arm_breakpoint = arm_eabi_breakpoint; |
b37a6290 YQ |
151 | #else |
152 | static const unsigned long arm_breakpoint = arm_abi_breakpoint; | |
17b1509a YQ |
153 | #endif |
154 | ||
155 | #define arm_breakpoint_len 4 | |
156 | static const unsigned short thumb_breakpoint = 0xde01; | |
157 | #define thumb_breakpoint_len 2 | |
158 | static const unsigned short thumb2_breakpoint[] = { 0xf7f0, 0xa000 }; | |
159 | #define thumb2_breakpoint_len 4 | |
160 | ||
161 | /* Returns 1 if the current instruction set is thumb, 0 otherwise. */ | |
162 | ||
163 | static int | |
164 | arm_is_thumb_mode (void) | |
165 | { | |
166 | struct regcache *regcache = get_thread_regcache (current_thread, 1); | |
167 | unsigned long cpsr; | |
168 | ||
169 | collect_register_by_name (regcache, "cpsr", &cpsr); | |
170 | ||
171 | if (cpsr & 0x20) | |
172 | return 1; | |
173 | else | |
174 | return 0; | |
175 | } | |
176 | ||
177 | /* Returns 1 if there is a software breakpoint at location. */ | |
178 | ||
179 | int | |
180 | arm_breakpoint_at (CORE_ADDR where) | |
181 | { | |
182 | if (arm_is_thumb_mode ()) | |
183 | { | |
184 | /* Thumb mode. */ | |
185 | unsigned short insn; | |
186 | ||
187 | (*the_target->read_memory) (where, (unsigned char *) &insn, 2); | |
188 | if (insn == thumb_breakpoint) | |
189 | return 1; | |
190 | ||
191 | if (insn == thumb2_breakpoint[0]) | |
192 | { | |
193 | (*the_target->read_memory) (where + 2, (unsigned char *) &insn, 2); | |
194 | if (insn == thumb2_breakpoint[1]) | |
195 | return 1; | |
196 | } | |
197 | } | |
198 | else | |
199 | { | |
200 | /* ARM mode. */ | |
201 | unsigned long insn; | |
202 | ||
203 | (*the_target->read_memory) (where, (unsigned char *) &insn, 4); | |
204 | if (insn == arm_abi_breakpoint) | |
205 | return 1; | |
206 | ||
207 | if (insn == arm_eabi_breakpoint) | |
208 | return 1; | |
209 | } | |
210 | ||
211 | return 0; | |
212 | } | |
213 | ||
214 | /* Enum describing the different kinds of breakpoints. */ | |
215 | enum arm_breakpoint_kinds | |
216 | { | |
217 | ARM_BP_KIND_THUMB = 2, | |
218 | ARM_BP_KIND_THUMB2 = 3, | |
219 | ARM_BP_KIND_ARM = 4, | |
220 | }; | |
221 | ||
222 | /* Implementation of linux_target_ops method "breakpoint_kind_from_pc". | |
223 | ||
224 | Determine the type and size of breakpoint to insert at PCPTR. Uses the | |
225 | program counter value to determine whether a 16-bit or 32-bit breakpoint | |
226 | should be used. It returns the breakpoint's kind, and adjusts the program | |
227 | counter (if necessary) to point to the actual memory location where the | |
228 | breakpoint should be inserted. */ | |
229 | ||
230 | int | |
231 | arm_breakpoint_kind_from_pc (CORE_ADDR *pcptr) | |
232 | { | |
233 | if (IS_THUMB_ADDR (*pcptr)) | |
234 | { | |
235 | gdb_byte buf[2]; | |
236 | ||
237 | *pcptr = UNMAKE_THUMB_ADDR (*pcptr); | |
238 | ||
239 | /* Check whether we are replacing a thumb2 32-bit instruction. */ | |
240 | if ((*the_target->read_memory) (*pcptr, buf, 2) == 0) | |
241 | { | |
242 | unsigned short inst1 = 0; | |
243 | ||
244 | (*the_target->read_memory) (*pcptr, (gdb_byte *) &inst1, 2); | |
245 | if (thumb_insn_size (inst1) == 4) | |
246 | return ARM_BP_KIND_THUMB2; | |
247 | } | |
248 | return ARM_BP_KIND_THUMB; | |
249 | } | |
250 | else | |
251 | return ARM_BP_KIND_ARM; | |
252 | } | |
253 | ||
254 | /* Implementation of the linux_target_ops method "sw_breakpoint_from_kind". */ | |
255 | ||
256 | const gdb_byte * | |
257 | arm_sw_breakpoint_from_kind (int kind , int *size) | |
258 | { | |
259 | *size = arm_breakpoint_len; | |
260 | /* Define an ARM-mode breakpoint; we only set breakpoints in the C | |
261 | library, which is most likely to be ARM. If the kernel supports | |
262 | clone events, we will never insert a breakpoint, so even a Thumb | |
263 | C library will work; so will mixing EABI/non-EABI gdbserver and | |
264 | application. */ | |
265 | switch (kind) | |
266 | { | |
267 | case ARM_BP_KIND_THUMB: | |
268 | *size = thumb_breakpoint_len; | |
269 | return (gdb_byte *) &thumb_breakpoint; | |
270 | case ARM_BP_KIND_THUMB2: | |
271 | *size = thumb2_breakpoint_len; | |
272 | return (gdb_byte *) &thumb2_breakpoint; | |
273 | case ARM_BP_KIND_ARM: | |
274 | *size = arm_breakpoint_len; | |
275 | return (const gdb_byte *) &arm_breakpoint; | |
276 | default: | |
277 | return NULL; | |
278 | } | |
279 | return NULL; | |
280 | } | |
281 | ||
282 | /* Implementation of the linux_target_ops method | |
283 | "breakpoint_kind_from_current_state". */ | |
284 | ||
285 | int | |
286 | arm_breakpoint_kind_from_current_state (CORE_ADDR *pcptr) | |
287 | { | |
288 | if (arm_is_thumb_mode ()) | |
289 | { | |
290 | *pcptr = MAKE_THUMB_ADDR (*pcptr); | |
291 | return arm_breakpoint_kind_from_pc (pcptr); | |
292 | } | |
293 | else | |
294 | { | |
295 | return arm_breakpoint_kind_from_pc (pcptr); | |
296 | } | |
297 | } | |
298 | ||
bd9e6534 YQ |
299 | void |
300 | initialize_low_arch_aarch32 (void) | |
301 | { | |
302 | init_registers_arm_with_neon (); | |
303 | ||
304 | initialize_regsets_info (&aarch32_regsets_info); | |
305 | } |