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bb903df0 PL |
1 | /* GNU/Linux/AArch64 specific low level interface, for the in-process |
2 | agent library for GDB. | |
3 | ||
e2882c85 | 4 | Copyright (C) 2015-2018 Free Software Foundation, Inc. |
bb903df0 PL |
5 | |
6 | This file is part of GDB. | |
7 | ||
8 | This program is free software; you can redistribute it and/or modify | |
9 | it under the terms of the GNU General Public License as published by | |
10 | the Free Software Foundation; either version 3 of the License, or | |
11 | (at your option) any later version. | |
12 | ||
13 | This program is distributed in the hope that it will be useful, | |
14 | but WITHOUT ANY WARRANTY; without even the implied warranty of | |
15 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
16 | GNU General Public License for more details. | |
17 | ||
18 | You should have received a copy of the GNU General Public License | |
19 | along with this program. If not, see <http://www.gnu.org/licenses/>. */ | |
20 | ||
21 | #include "server.h" | |
a13c4696 | 22 | #include <sys/mman.h> |
bb903df0 | 23 | #include "tracepoint.h" |
d0a9981f | 24 | #include <elf.h> |
a13c4696 MK |
25 | #ifdef HAVE_GETAUXVAL |
26 | #include <sys/auxv.h> | |
27 | #endif | |
d6d7ce56 | 28 | #include "linux-aarch64-tdesc.h" |
bb903df0 | 29 | |
bb903df0 PL |
30 | /* Each register saved by the jump pad is in a 16 byte cell. */ |
31 | #define FT_CR_SIZE 16 | |
32 | ||
33 | #define FT_CR_FPCR 0 | |
34 | #define FT_CR_FPSR 1 | |
35 | #define FT_CR_CPSR 2 | |
36 | #define FT_CR_PC 3 | |
37 | #define FT_CR_SP 4 | |
38 | #define FT_CR_X0 5 | |
39 | #define FT_CR_GPR(n) (FT_CR_X0 + (n)) | |
40 | #define FT_CR_FPR(n) (FT_CR_GPR (31) + (n)) | |
41 | ||
42 | /* Mapping between registers collected by the jump pad and GDB's register | |
43 | array layout used by regcache. | |
44 | ||
45 | See linux-aarch64-low.c (aarch64_install_fast_tracepoint_jump_pad) for | |
46 | more details. */ | |
47 | ||
48 | static const int aarch64_ft_collect_regmap[] = { | |
49 | FT_CR_GPR (0), | |
50 | FT_CR_GPR (1), | |
51 | FT_CR_GPR (2), | |
52 | FT_CR_GPR (3), | |
53 | FT_CR_GPR (4), | |
54 | FT_CR_GPR (5), | |
55 | FT_CR_GPR (6), | |
56 | FT_CR_GPR (7), | |
57 | FT_CR_GPR (8), | |
58 | FT_CR_GPR (9), | |
59 | FT_CR_GPR (10), | |
60 | FT_CR_GPR (11), | |
61 | FT_CR_GPR (12), | |
62 | FT_CR_GPR (13), | |
63 | FT_CR_GPR (14), | |
64 | FT_CR_GPR (15), | |
65 | FT_CR_GPR (16), | |
66 | FT_CR_GPR (17), | |
67 | FT_CR_GPR (18), | |
68 | FT_CR_GPR (19), | |
69 | FT_CR_GPR (20), | |
70 | FT_CR_GPR (21), | |
71 | FT_CR_GPR (22), | |
72 | FT_CR_GPR (23), | |
73 | FT_CR_GPR (24), | |
74 | FT_CR_GPR (25), | |
75 | FT_CR_GPR (26), | |
76 | FT_CR_GPR (27), | |
77 | FT_CR_GPR (28), | |
78 | /* FP */ | |
79 | FT_CR_GPR (29), | |
80 | /* LR */ | |
81 | FT_CR_GPR (30), | |
82 | FT_CR_SP, | |
83 | FT_CR_PC, | |
84 | FT_CR_CPSR, | |
85 | FT_CR_FPR (0), | |
86 | FT_CR_FPR (1), | |
87 | FT_CR_FPR (2), | |
88 | FT_CR_FPR (3), | |
89 | FT_CR_FPR (4), | |
90 | FT_CR_FPR (5), | |
91 | FT_CR_FPR (6), | |
92 | FT_CR_FPR (7), | |
93 | FT_CR_FPR (8), | |
94 | FT_CR_FPR (9), | |
95 | FT_CR_FPR (10), | |
96 | FT_CR_FPR (11), | |
97 | FT_CR_FPR (12), | |
98 | FT_CR_FPR (13), | |
99 | FT_CR_FPR (14), | |
100 | FT_CR_FPR (15), | |
101 | FT_CR_FPR (16), | |
102 | FT_CR_FPR (17), | |
103 | FT_CR_FPR (18), | |
104 | FT_CR_FPR (19), | |
105 | FT_CR_FPR (20), | |
106 | FT_CR_FPR (21), | |
107 | FT_CR_FPR (22), | |
108 | FT_CR_FPR (23), | |
109 | FT_CR_FPR (24), | |
110 | FT_CR_FPR (25), | |
111 | FT_CR_FPR (26), | |
112 | FT_CR_FPR (27), | |
113 | FT_CR_FPR (28), | |
114 | FT_CR_FPR (29), | |
115 | FT_CR_FPR (30), | |
116 | FT_CR_FPR (31), | |
117 | FT_CR_FPSR, | |
118 | FT_CR_FPCR | |
119 | }; | |
120 | ||
121 | #define AARCH64_NUM_FT_COLLECT_GREGS \ | |
122 | (sizeof (aarch64_ft_collect_regmap) / sizeof(aarch64_ft_collect_regmap[0])) | |
123 | ||
124 | /* Fill in REGCACHE with registers saved by the jump pad in BUF. */ | |
125 | ||
126 | void | |
127 | supply_fast_tracepoint_registers (struct regcache *regcache, | |
128 | const unsigned char *buf) | |
129 | { | |
130 | int i; | |
131 | ||
132 | for (i = 0; i < AARCH64_NUM_FT_COLLECT_GREGS; i++) | |
133 | supply_register (regcache, i, | |
134 | ((char *) buf) | |
135 | + (aarch64_ft_collect_regmap[i] * FT_CR_SIZE)); | |
136 | } | |
137 | ||
1cda1512 MK |
138 | ULONGEST |
139 | get_raw_reg (const unsigned char *raw_regs, int regnum) | |
bb903df0 PL |
140 | { |
141 | if (regnum >= AARCH64_NUM_FT_COLLECT_GREGS) | |
142 | return 0; | |
143 | ||
144 | return *(ULONGEST *) (raw_regs | |
145 | + aarch64_ft_collect_regmap[regnum] * FT_CR_SIZE); | |
146 | } | |
147 | ||
ae91f625 MK |
148 | /* Return target_desc to use for IPA, given the tdesc index passed by |
149 | gdbserver. Index is ignored, since we have only one tdesc | |
150 | at the moment. */ | |
151 | ||
152 | const struct target_desc * | |
153 | get_ipa_tdesc (int idx) | |
154 | { | |
d6d7ce56 | 155 | return aarch64_linux_read_description (); |
ae91f625 MK |
156 | } |
157 | ||
a13c4696 MK |
158 | /* Allocate buffer for the jump pads. The branch instruction has a reach |
159 | of +/- 128MiB, and the executable is loaded at 0x400000 (4MiB). | |
160 | To maximize the area of executable that can use tracepoints, try | |
161 | allocating at 0x400000 - size initially, decreasing until we hit | |
162 | a free area. */ | |
163 | ||
164 | void * | |
165 | alloc_jump_pad_buffer (size_t size) | |
166 | { | |
167 | uintptr_t addr; | |
168 | uintptr_t exec_base = getauxval (AT_PHDR); | |
169 | int pagesize; | |
170 | void *res; | |
171 | ||
172 | if (exec_base == 0) | |
173 | exec_base = 0x400000; | |
174 | ||
175 | pagesize = sysconf (_SC_PAGE_SIZE); | |
176 | if (pagesize == -1) | |
177 | perror_with_name ("sysconf"); | |
178 | ||
179 | addr = exec_base - size; | |
180 | ||
181 | /* size should already be page-aligned, but this can't hurt. */ | |
182 | addr &= ~(pagesize - 1); | |
183 | ||
184 | /* Search for a free area. If we hit 0, we're out of luck. */ | |
185 | for (; addr; addr -= pagesize) | |
186 | { | |
187 | /* No MAP_FIXED - we don't want to zap someone's mapping. */ | |
188 | res = mmap ((void *) addr, size, | |
189 | PROT_READ | PROT_WRITE | PROT_EXEC, | |
190 | MAP_PRIVATE | MAP_ANONYMOUS, -1, 0); | |
191 | ||
192 | /* If we got what we wanted, return. */ | |
193 | if ((uintptr_t) res == addr) | |
194 | return res; | |
195 | ||
196 | /* If we got a mapping, but at a wrong address, undo it. */ | |
197 | if (res != MAP_FAILED) | |
198 | munmap (res, size); | |
199 | } | |
200 | ||
201 | return NULL; | |
202 | } | |
203 | ||
bb903df0 PL |
204 | void |
205 | initialize_low_tracepoint (void) | |
206 | { | |
a8806230 | 207 | aarch64_linux_read_description (); |
bb903df0 | 208 | } |