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a2174ba4 MK |
1 | /* GNU/Linux/PowerPC specific low level interface, for the in-process |
2 | agent library for GDB. | |
3 | ||
4 | Copyright (C) 2016 Free Software Foundation, Inc. | |
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" | |
22 | #include <sys/mman.h> | |
23 | #include "tracepoint.h" | |
24 | #include "linux-ppc-tdesc.h" | |
d0a9981f | 25 | #include <elf.h> |
a2174ba4 MK |
26 | #ifdef HAVE_GETAUXVAL |
27 | #include <sys/auxv.h> | |
28 | #endif | |
29 | ||
30 | /* These macros define the position of registers in the buffer collected | |
31 | by the fast tracepoint jump pad. */ | |
32 | #define FT_CR_R0 0 | |
33 | #define FT_CR_CR 32 | |
34 | #define FT_CR_XER 33 | |
35 | #define FT_CR_LR 34 | |
36 | #define FT_CR_CTR 35 | |
37 | #define FT_CR_PC 36 | |
38 | #define FT_CR_GPR(n) (FT_CR_R0 + (n)) | |
39 | ||
40 | static const int ppc_ft_collect_regmap[] = { | |
41 | /* GPRs */ | |
42 | FT_CR_GPR (0), FT_CR_GPR (1), FT_CR_GPR (2), | |
43 | FT_CR_GPR (3), FT_CR_GPR (4), FT_CR_GPR (5), | |
44 | FT_CR_GPR (6), FT_CR_GPR (7), FT_CR_GPR (8), | |
45 | FT_CR_GPR (9), FT_CR_GPR (10), FT_CR_GPR (11), | |
46 | FT_CR_GPR (12), FT_CR_GPR (13), FT_CR_GPR (14), | |
47 | FT_CR_GPR (15), FT_CR_GPR (16), FT_CR_GPR (17), | |
48 | FT_CR_GPR (18), FT_CR_GPR (19), FT_CR_GPR (20), | |
49 | FT_CR_GPR (21), FT_CR_GPR (22), FT_CR_GPR (23), | |
50 | FT_CR_GPR (24), FT_CR_GPR (25), FT_CR_GPR (26), | |
51 | FT_CR_GPR (27), FT_CR_GPR (28), FT_CR_GPR (29), | |
52 | FT_CR_GPR (30), FT_CR_GPR (31), | |
53 | /* FPRs - not collected. */ | |
54 | -1, -1, -1, -1, -1, -1, -1, -1, | |
55 | -1, -1, -1, -1, -1, -1, -1, -1, | |
56 | -1, -1, -1, -1, -1, -1, -1, -1, | |
57 | -1, -1, -1, -1, -1, -1, -1, -1, | |
58 | FT_CR_PC, /* PC */ | |
59 | -1, /* MSR */ | |
60 | FT_CR_CR, /* CR */ | |
61 | FT_CR_LR, /* LR */ | |
62 | FT_CR_CTR, /* CTR */ | |
63 | FT_CR_XER, /* XER */ | |
64 | -1, /* FPSCR */ | |
65 | }; | |
66 | ||
67 | #define PPC_NUM_FT_COLLECT_GREGS \ | |
68 | (sizeof (ppc_ft_collect_regmap) / sizeof(ppc_ft_collect_regmap[0])) | |
69 | ||
70 | /* Supply registers collected by the fast tracepoint jump pad. | |
71 | BUF is the second argument we pass to gdb_collect in jump pad. */ | |
72 | ||
73 | void | |
74 | supply_fast_tracepoint_registers (struct regcache *regcache, | |
75 | const unsigned char *buf) | |
76 | { | |
77 | int i; | |
78 | ||
79 | for (i = 0; i < PPC_NUM_FT_COLLECT_GREGS; i++) | |
80 | { | |
81 | if (ppc_ft_collect_regmap[i] == -1) | |
82 | continue; | |
83 | supply_register (regcache, i, | |
84 | ((char *) buf) | |
85 | + ppc_ft_collect_regmap[i] * sizeof (long)); | |
86 | } | |
87 | } | |
88 | ||
89 | /* Return the value of register REGNUM. RAW_REGS is collected buffer | |
90 | by jump pad. This function is called by emit_reg. */ | |
91 | ||
92 | ULONGEST | |
93 | get_raw_reg (const unsigned char *raw_regs, int regnum) | |
94 | { | |
95 | if (regnum >= PPC_NUM_FT_COLLECT_GREGS) | |
96 | return 0; | |
97 | if (ppc_ft_collect_regmap[regnum] == -1) | |
98 | return 0; | |
99 | ||
100 | return *(unsigned long *) (raw_regs | |
101 | + ppc_ft_collect_regmap[regnum] * sizeof (long)); | |
102 | } | |
103 | ||
104 | /* Allocate buffer for the jump pads. The branch instruction has a reach | |
105 | of +/- 32MiB, and the executable is loaded at 0x10000000 (256MiB). | |
106 | ||
107 | 64-bit: To maximize the area of executable that can use tracepoints, | |
108 | try allocating at 0x10000000 - size initially, decreasing until we hit | |
109 | a free area. | |
110 | ||
111 | 32-bit: ld.so loads dynamic libraries right below the executable, so | |
112 | we cannot depend on that area (dynamic libraries can be quite large). | |
113 | Instead, aim right after the executable - at sbrk(0). This will | |
114 | cause future brk to fail, and malloc will fallback to mmap. */ | |
115 | ||
116 | void * | |
117 | alloc_jump_pad_buffer (size_t size) | |
118 | { | |
119 | #ifdef __powerpc64__ | |
120 | uintptr_t addr; | |
121 | uintptr_t exec_base = getauxval (AT_PHDR); | |
122 | int pagesize; | |
123 | void *res; | |
124 | ||
125 | if (exec_base == 0) | |
126 | exec_base = 0x10000000; | |
127 | ||
128 | pagesize = sysconf (_SC_PAGE_SIZE); | |
129 | if (pagesize == -1) | |
130 | perror_with_name ("sysconf"); | |
131 | ||
132 | addr = exec_base - size; | |
133 | ||
134 | /* size should already be page-aligned, but this can't hurt. */ | |
135 | addr &= ~(pagesize - 1); | |
136 | ||
137 | /* Search for a free area. If we hit 0, we're out of luck. */ | |
138 | for (; addr; addr -= pagesize) | |
139 | { | |
140 | /* No MAP_FIXED - we don't want to zap someone's mapping. */ | |
141 | res = mmap ((void *) addr, size, | |
142 | PROT_READ | PROT_WRITE | PROT_EXEC, | |
143 | MAP_PRIVATE | MAP_ANONYMOUS, -1, 0); | |
144 | ||
145 | /* If we got what we wanted, return. */ | |
146 | if ((uintptr_t) res == addr) | |
147 | return res; | |
148 | ||
149 | /* If we got a mapping, but at a wrong address, undo it. */ | |
150 | if (res != MAP_FAILED) | |
151 | munmap (res, size); | |
152 | } | |
153 | ||
154 | return NULL; | |
155 | #else | |
156 | void *target = sbrk (0); | |
157 | void *res = mmap (target, size, PROT_READ | PROT_WRITE | PROT_EXEC, | |
158 | MAP_PRIVATE | MAP_ANONYMOUS, -1, 0); | |
159 | ||
160 | if (res == target) | |
161 | return res; | |
162 | ||
163 | if (res != MAP_FAILED) | |
164 | munmap (res, size); | |
165 | ||
166 | return NULL; | |
167 | #endif | |
168 | } | |
169 | ||
170 | /* Return target_desc to use for IPA, given the tdesc index passed by | |
171 | gdbserver. */ | |
172 | ||
173 | const struct target_desc * | |
174 | get_ipa_tdesc (int idx) | |
175 | { | |
176 | switch (idx) | |
177 | { | |
178 | #ifdef __powerpc64__ | |
179 | case PPC_TDESC_BASE: | |
180 | return tdesc_powerpc_64l; | |
181 | case PPC_TDESC_ALTIVEC: | |
182 | return tdesc_powerpc_altivec64l; | |
183 | case PPC_TDESC_CELL: | |
184 | return tdesc_powerpc_cell64l; | |
185 | case PPC_TDESC_VSX: | |
186 | return tdesc_powerpc_vsx64l; | |
187 | case PPC_TDESC_ISA205: | |
188 | return tdesc_powerpc_isa205_64l; | |
189 | case PPC_TDESC_ISA205_ALTIVEC: | |
190 | return tdesc_powerpc_isa205_altivec64l; | |
191 | case PPC_TDESC_ISA205_VSX: | |
192 | return tdesc_powerpc_isa205_vsx64l; | |
193 | #else | |
194 | case PPC_TDESC_BASE: | |
195 | return tdesc_powerpc_32l; | |
196 | case PPC_TDESC_ALTIVEC: | |
197 | return tdesc_powerpc_altivec32l; | |
198 | case PPC_TDESC_CELL: | |
199 | return tdesc_powerpc_cell32l; | |
200 | case PPC_TDESC_VSX: | |
201 | return tdesc_powerpc_vsx32l; | |
202 | case PPC_TDESC_ISA205: | |
203 | return tdesc_powerpc_isa205_32l; | |
204 | case PPC_TDESC_ISA205_ALTIVEC: | |
205 | return tdesc_powerpc_isa205_altivec32l; | |
206 | case PPC_TDESC_ISA205_VSX: | |
207 | return tdesc_powerpc_isa205_vsx32l; | |
208 | case PPC_TDESC_E500: | |
209 | return tdesc_powerpc_e500l; | |
210 | #endif | |
211 | default: | |
212 | internal_error (__FILE__, __LINE__, | |
213 | "unknown ipa tdesc index: %d", idx); | |
214 | #ifdef __powerpc64__ | |
215 | return tdesc_powerpc_64l; | |
216 | #else | |
217 | return tdesc_powerpc_32l; | |
218 | #endif | |
219 | } | |
220 | } | |
221 | ||
222 | ||
223 | /* Initialize ipa_tdesc and others. */ | |
224 | ||
225 | void | |
226 | initialize_low_tracepoint (void) | |
227 | { | |
228 | #ifdef __powerpc64__ | |
229 | init_registers_powerpc_64l (); | |
230 | init_registers_powerpc_altivec64l (); | |
231 | init_registers_powerpc_cell64l (); | |
232 | init_registers_powerpc_vsx64l (); | |
233 | init_registers_powerpc_isa205_64l (); | |
234 | init_registers_powerpc_isa205_altivec64l (); | |
235 | init_registers_powerpc_isa205_vsx64l (); | |
236 | #else | |
237 | init_registers_powerpc_32l (); | |
238 | init_registers_powerpc_altivec32l (); | |
239 | init_registers_powerpc_cell32l (); | |
240 | init_registers_powerpc_vsx32l (); | |
241 | init_registers_powerpc_isa205_32l (); | |
242 | init_registers_powerpc_isa205_altivec32l (); | |
243 | init_registers_powerpc_isa205_vsx32l (); | |
244 | init_registers_powerpc_e500l (); | |
245 | #endif | |
246 | } |