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1 | /* Native-dependent code for GNU/Linux TILE-Gx. |
2 | ||
e2882c85 | 3 | Copyright (C) 2012-2018 Free Software Foundation, Inc. |
65662cde PA |
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" | |
21 | #include "inferior.h" | |
22 | #include "gdbcore.h" | |
23 | #include "regcache.h" | |
24 | #include "linux-nat.h" | |
bcc0c096 | 25 | #include "inf-ptrace.h" |
65662cde | 26 | |
5826e159 | 27 | #include "nat/gdb_ptrace.h" |
65662cde | 28 | |
65662cde PA |
29 | #include <sys/procfs.h> |
30 | ||
e2616788 | 31 | /* Defines ps_err_e, struct ps_prochandle. */ |
65662cde | 32 | #include "gdb_proc_service.h" |
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33 | |
34 | /* Prototypes for supply_gregset etc. */ | |
35 | #include "gregset.h" | |
36 | ||
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37 | /* The register sets used in GNU/Linux ELF core-dumps are identical to |
38 | the register sets in `struct user' that is used for a.out | |
39 | core-dumps, and is also used by `ptrace'. The corresponding types | |
40 | are `elf_gregset_t' for the general-purpose registers (with | |
41 | `elf_greg_t' the type of a single GP register) and `elf_fpregset_t' | |
42 | for the floating-point registers. | |
43 | ||
44 | Those types used to be available under the names `gregset_t' and | |
45 | `fpregset_t' too, and this file used those names in the past. But | |
46 | those names are now used for the register sets used in the | |
47 | `mcontext_t' type, and have a different size and layout. */ | |
48 | ||
49 | /* Mapping between the general-purpose registers in `struct user' | |
50 | format and GDB's register array layout. Note that we map the | |
51 | first 56 registers (0 thru 55) one-to-one. GDB maps the pc to | |
52 | slot 64, but ptrace returns it in slot 56. */ | |
53 | static const int regmap[] = | |
54 | { | |
55 | 0, 1, 2, 3, 4, 5, 6, 7, | |
56 | 8, 9, 10, 11, 12, 13, 14, 15, | |
57 | 16, 17, 18, 19, 20, 21, 22, 23, | |
58 | 24, 25, 26, 27, 28, 29, 30, 31, | |
59 | 32, 33, 34, 35, 36, 37, 38, 39, | |
60 | 40, 41, 42, 43, 44, 45, 46, 47, | |
61 | 48, 49, 50, 51, 52, 53, 54, 55, | |
62 | -1, -1, -1, -1, -1, -1, -1, -1, | |
4aaf2503 | 63 | 56, 58 |
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64 | }; |
65 | ||
66 | /* Transfering the general-purpose registers between GDB, inferiors | |
67 | and core files. */ | |
68 | ||
69 | /* Fill GDB's register array with the general-purpose register values | |
70 | in *GREGSETP. */ | |
71 | ||
72 | void | |
73 | supply_gregset (struct regcache* regcache, | |
74 | const elf_gregset_t *gregsetp) | |
75 | { | |
76 | elf_greg_t *regp = (elf_greg_t *) gregsetp; | |
77 | int i; | |
78 | ||
79 | for (i = 0; i < sizeof (regmap) / sizeof (regmap[0]); i++) | |
80 | if (regmap[i] >= 0) | |
81 | regcache_raw_supply (regcache, i, regp + regmap[i]); | |
82 | } | |
83 | ||
84 | /* Fill registers in *GREGSETPS with the values in GDB's | |
85 | register array. */ | |
86 | ||
87 | void | |
88 | fill_gregset (const struct regcache* regcache, | |
89 | elf_gregset_t *gregsetp, int regno) | |
90 | { | |
91 | elf_greg_t *regp = (elf_greg_t *) gregsetp; | |
92 | int i; | |
93 | ||
94 | for (i = 0; i < sizeof (regmap) / sizeof (regmap[0]); i++) | |
95 | if (regmap[i] >= 0) | |
96 | regcache_raw_collect (regcache, i, regp + regmap[i]); | |
97 | } | |
98 | ||
99 | /* Transfering floating-point registers between GDB, inferiors and cores. */ | |
100 | ||
101 | /* Fill GDB's register array with the floating-point register values in | |
102 | *FPREGSETP. */ | |
103 | ||
104 | void | |
105 | supply_fpregset (struct regcache *regcache, | |
106 | const elf_fpregset_t *fpregsetp) | |
107 | { | |
108 | /* NOTE: There are no floating-point registers for TILE-Gx. */ | |
109 | } | |
110 | ||
111 | /* Fill register REGNO (if it is a floating-point register) in | |
112 | *FPREGSETP with the value in GDB's register array. If REGNO is -1, | |
113 | do this for all registers. */ | |
114 | ||
115 | void | |
116 | fill_fpregset (const struct regcache *regcache, | |
117 | elf_fpregset_t *fpregsetp, int regno) | |
118 | { | |
119 | /* NOTE: There are no floating-point registers for TILE-Gx. */ | |
120 | } | |
121 | ||
122 | /* Fetch register REGNUM from the inferior. If REGNUM is -1, do this | |
123 | for all registers. */ | |
124 | ||
125 | static void | |
126 | fetch_inferior_registers (struct target_ops *ops, | |
127 | struct regcache *regcache, int regnum) | |
128 | { | |
129 | elf_gregset_t regs; | |
bcc0c096 | 130 | pid_t tid = get_ptrace_pid (regcache_get_ptid (regcache)); |
65662cde PA |
131 | |
132 | if (ptrace (PTRACE_GETREGS, tid, 0, (PTRACE_TYPE_ARG3) ®s) < 0) | |
133 | perror_with_name (_("Couldn't get registers")); | |
134 | ||
135 | supply_gregset (regcache, (const elf_gregset_t *)®s); | |
136 | } | |
137 | ||
138 | /* Store register REGNUM back into the inferior. If REGNUM is -1, do | |
139 | this for all registers. */ | |
140 | ||
141 | static void | |
142 | store_inferior_registers (struct target_ops *ops, | |
143 | struct regcache *regcache, int regnum) | |
144 | { | |
145 | elf_gregset_t regs; | |
bcc0c096 | 146 | pid_t tid = get_ptrace_pid (regcache_get_ptid (regcache)); |
65662cde PA |
147 | |
148 | if (ptrace (PTRACE_GETREGS, tid, 0, (PTRACE_TYPE_ARG3) ®s) < 0) | |
149 | perror_with_name (_("Couldn't get registers")); | |
150 | ||
151 | fill_gregset (regcache, ®s, regnum); | |
152 | ||
153 | if (ptrace (PTRACE_SETREGS, tid, 0, (PTRACE_TYPE_ARG3) ®s) < 0) | |
154 | perror_with_name (_("Couldn't write registers")); | |
155 | } | |
156 | ||
65662cde PA |
157 | void |
158 | _initialize_tile_linux_nat (void) | |
159 | { | |
160 | struct target_ops *t; | |
161 | ||
162 | /* Fill in the generic GNU/Linux methods. */ | |
163 | t = linux_target (); | |
164 | ||
165 | /* Add our register access methods. */ | |
166 | t->to_fetch_registers = fetch_inferior_registers; | |
167 | t->to_store_registers = store_inferior_registers; | |
168 | ||
169 | /* Register the target. */ | |
170 | linux_nat_add_target (t); | |
171 | } |