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9b32d526 KI |
1 | /* Native-dependent code for GNU/Linux m32r. |
2 | ||
6aba47ca | 3 | Copyright (C) 2004, 2005, 2006, 2007 Free Software Foundation, Inc. |
9b32d526 KI |
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 2 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, write to the Free Software | |
197e01b6 EZ |
19 | Foundation, Inc., 51 Franklin Street, Fifth Floor, |
20 | Boston, MA 02110-1301, USA. */ | |
9b32d526 KI |
21 | |
22 | #include "defs.h" | |
23 | #include "inferior.h" | |
24 | #include "gdbcore.h" | |
25 | #include "regcache.h" | |
26 | #include "linux-nat.h" | |
10d6c8cd | 27 | #include "target.h" |
9b32d526 KI |
28 | |
29 | #include "gdb_assert.h" | |
30 | #include "gdb_string.h" | |
31 | #include <sys/ptrace.h> | |
32 | #include <sys/user.h> | |
33 | #include <sys/procfs.h> | |
34 | ||
35 | /* Prototypes for supply_gregset etc. */ | |
36 | #include "gregset.h" | |
37 | ||
38 | #include "m32r-tdep.h" | |
39 | \f | |
40 | ||
41 | ||
42 | ||
43 | /* Since EVB register is not available for native debug, we reduce | |
44 | the number of registers. */ | |
45 | #define M32R_LINUX_NUM_REGS (M32R_NUM_REGS - 1) | |
46 | ||
47 | /* Mapping between the general-purpose registers in `struct user' | |
48 | format and GDB's register array layout. */ | |
49 | static int regmap[] = { | |
50 | 4, 5, 6, 7, 0, 1, 2, 8, | |
51 | 9, 10, 11, 12, 13, 24, 25, 23, | |
52 | 19, 19, 26, 23, 22, 20, 16, 15 | |
53 | }; | |
54 | ||
55 | #define PSW_REGMAP 19 | |
56 | #define BBPSW_REGMAP 21 | |
57 | #define SPU_REGMAP 23 | |
58 | #define SPI_REGMAP 26 | |
59 | ||
60 | /* Doee apply to the corresponding SET requests as well. */ | |
61 | #define GETREGS_SUPPLIES(regno) (0 <= (regno) && (regno) <= M32R_LINUX_NUM_REGS) | |
62 | \f | |
63 | ||
64 | ||
65 | /* Transfering the general-purpose registers between GDB, inferiors | |
66 | and core files. */ | |
67 | ||
68 | /* Fill GDB's register array with the general-purpose register values | |
69 | in *GREGSETP. */ | |
70 | ||
71 | void | |
72 | supply_gregset (elf_gregset_t * gregsetp) | |
73 | { | |
74 | elf_greg_t *regp = (elf_greg_t *) gregsetp; | |
75 | int i; | |
76 | unsigned long psw, bbpsw; | |
77 | ||
78 | psw = *(regp + PSW_REGMAP); | |
79 | bbpsw = *(regp + BBPSW_REGMAP); | |
80 | ||
81 | for (i = 0; i < M32R_LINUX_NUM_REGS; i++) | |
82 | { | |
d817e083 UW |
83 | elf_greg_t regval; |
84 | ||
9b32d526 KI |
85 | switch (i) |
86 | { | |
87 | case PSW_REGNUM: | |
d817e083 | 88 | regval = ((0x00c1 & bbpsw) << 8) | ((0xc100 & psw) >> 8); |
9b32d526 KI |
89 | break; |
90 | case CBR_REGNUM: | |
d817e083 UW |
91 | regval = ((psw >> 8) & 1); |
92 | break; | |
93 | default: | |
94 | regval = *(regp + regmap[i]); | |
9b32d526 KI |
95 | break; |
96 | } | |
97 | ||
98 | if (i != M32R_SP_REGNUM) | |
d817e083 | 99 | regcache_raw_supply (current_regcache, i, ®val); |
9b32d526 KI |
100 | else if (psw & 0x8000) |
101 | regcache_raw_supply (current_regcache, i, regp + SPU_REGMAP); | |
102 | else | |
103 | regcache_raw_supply (current_regcache, i, regp + SPI_REGMAP); | |
104 | } | |
105 | } | |
106 | ||
107 | /* Fetch all general-purpose registers from process/thread TID and | |
108 | store their values in GDB's register array. */ | |
109 | ||
110 | static void | |
111 | fetch_regs (int tid) | |
112 | { | |
113 | elf_gregset_t regs; | |
114 | ||
115 | if (ptrace (PTRACE_GETREGS, tid, 0, (int) ®s) < 0) | |
e2e0b3e5 | 116 | perror_with_name (_("Couldn't get registers")); |
9b32d526 KI |
117 | |
118 | supply_gregset (®s); | |
119 | } | |
120 | ||
121 | /* Fill register REGNO (if it is a general-purpose register) in | |
122 | *GREGSETPS with the value in GDB's register array. If REGNO is -1, | |
123 | do this for all registers. */ | |
124 | ||
125 | void | |
126 | fill_gregset (elf_gregset_t * gregsetp, int regno) | |
127 | { | |
128 | elf_greg_t *regp = (elf_greg_t *) gregsetp; | |
129 | int i; | |
130 | unsigned long psw, bbpsw, tmp; | |
131 | ||
132 | psw = *(regp + PSW_REGMAP); | |
133 | bbpsw = *(regp + BBPSW_REGMAP); | |
134 | ||
135 | for (i = 0; i < M32R_LINUX_NUM_REGS; i++) | |
136 | { | |
137 | if (regno != -1 && regno != i) | |
138 | continue; | |
139 | ||
140 | if (i == CBR_REGNUM || i == PSW_REGNUM) | |
141 | continue; | |
142 | ||
143 | if (i == SPU_REGNUM || i == SPI_REGNUM) | |
144 | continue; | |
145 | ||
146 | if (i != M32R_SP_REGNUM) | |
147 | regcache_raw_collect (current_regcache, i, regp + regmap[i]); | |
148 | else if (psw & 0x8000) | |
149 | regcache_raw_collect (current_regcache, i, regp + SPU_REGMAP); | |
150 | else | |
151 | regcache_raw_collect (current_regcache, i, regp + SPI_REGMAP); | |
152 | } | |
153 | } | |
154 | ||
155 | /* Store all valid general-purpose registers in GDB's register array | |
156 | into the process/thread specified by TID. */ | |
157 | ||
158 | static void | |
159 | store_regs (int tid, int regno) | |
160 | { | |
161 | elf_gregset_t regs; | |
162 | ||
163 | if (ptrace (PTRACE_GETREGS, tid, 0, (int) ®s) < 0) | |
e2e0b3e5 | 164 | perror_with_name (_("Couldn't get registers")); |
9b32d526 KI |
165 | |
166 | fill_gregset (®s, regno); | |
167 | ||
168 | if (ptrace (PTRACE_SETREGS, tid, 0, (int) ®s) < 0) | |
e2e0b3e5 | 169 | perror_with_name (_("Couldn't write registers")); |
9b32d526 KI |
170 | } |
171 | \f | |
172 | ||
173 | ||
174 | /* Transfering floating-point registers between GDB, inferiors and cores. | |
175 | Since M32R has no floating-point registers, these functions do nothing. */ | |
176 | ||
177 | void | |
178 | supply_fpregset (gdb_fpregset_t *fpregs) | |
179 | { | |
180 | } | |
181 | ||
182 | void | |
183 | fill_fpregset (gdb_fpregset_t *fpregs, int regno) | |
184 | { | |
185 | } | |
186 | \f | |
187 | ||
188 | ||
189 | /* Transferring arbitrary registers between GDB and inferior. */ | |
190 | ||
191 | /* Fetch register REGNO from the child process. If REGNO is -1, do | |
192 | this for all registers (including the floating point and SSE | |
193 | registers). */ | |
194 | ||
10d6c8cd DJ |
195 | static void |
196 | m32r_linux_fetch_inferior_registers (int regno) | |
9b32d526 KI |
197 | { |
198 | int tid; | |
199 | ||
200 | /* GNU/Linux LWP ID's are process ID's. */ | |
201 | tid = TIDGET (inferior_ptid); | |
202 | if (tid == 0) | |
203 | tid = PIDGET (inferior_ptid); /* Not a threaded program. */ | |
204 | ||
205 | /* Use the PTRACE_GETREGS request whenever possible, since it | |
206 | transfers more registers in one system call, and we'll cache the | |
207 | results. */ | |
208 | if (regno == -1 || GETREGS_SUPPLIES (regno)) | |
209 | { | |
210 | fetch_regs (tid); | |
211 | return; | |
212 | } | |
213 | ||
214 | internal_error (__FILE__, __LINE__, | |
e2e0b3e5 | 215 | _("Got request for bad register number %d."), regno); |
9b32d526 KI |
216 | } |
217 | ||
218 | /* Store register REGNO back into the child process. If REGNO is -1, | |
219 | do this for all registers (including the floating point and SSE | |
220 | registers). */ | |
10d6c8cd DJ |
221 | static void |
222 | m32r_linux_store_inferior_registers (int regno) | |
9b32d526 KI |
223 | { |
224 | int tid; | |
225 | ||
226 | /* GNU/Linux LWP ID's are process ID's. */ | |
227 | if ((tid = TIDGET (inferior_ptid)) == 0) | |
228 | tid = PIDGET (inferior_ptid); /* Not a threaded program. */ | |
229 | ||
230 | /* Use the PTRACE_SETREGS request whenever possible, since it | |
231 | transfers more registers in one system call. */ | |
232 | if (regno == -1 || GETREGS_SUPPLIES (regno)) | |
233 | { | |
234 | store_regs (tid, regno); | |
235 | return; | |
236 | } | |
237 | ||
238 | internal_error (__FILE__, __LINE__, | |
e2e0b3e5 | 239 | _("Got request to store bad register number %d."), regno); |
9b32d526 | 240 | } |
10d6c8cd DJ |
241 | |
242 | void _initialize_m32r_linux_nat (void); | |
243 | ||
244 | void | |
245 | _initialize_m32r_linux_nat (void) | |
246 | { | |
247 | struct target_ops *t; | |
248 | ||
249 | /* Fill in the generic GNU/Linux methods. */ | |
250 | t = linux_target (); | |
251 | ||
252 | /* Add our register access methods. */ | |
253 | t->to_fetch_registers = m32r_linux_fetch_inferior_registers; | |
254 | t->to_store_registers = m32r_linux_store_inferior_registers; | |
255 | ||
256 | /* Register the target. */ | |
f973ed9c | 257 | linux_nat_add_target (t); |
10d6c8cd | 258 | } |