Commit | Line | Data |
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789f3b5f MK |
1 | /* Target-dependent code for NetBSD/alpha. |
2 | ||
ecd75fc8 | 3 | Copyright (C) 2002-2014 Free Software Foundation, Inc. |
2031c21a | 4 | |
da8ca43d JT |
5 | Contributed by Wasabi Systems, Inc. |
6 | ||
7 | This file is part of GDB. | |
8 | ||
9 | This program is free software; you can redistribute it and/or modify | |
10 | it under the terms of the GNU General Public License as published by | |
a9762ec7 | 11 | the Free Software Foundation; either version 3 of the License, or |
da8ca43d JT |
12 | (at your option) any later version. |
13 | ||
14 | This program is distributed in the hope that it will be useful, | |
15 | but WITHOUT ANY WARRANTY; without even the implied warranty of | |
16 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
17 | GNU General Public License for more details. | |
18 | ||
19 | You should have received a copy of the GNU General Public License | |
a9762ec7 | 20 | along with this program. If not, see <http://www.gnu.org/licenses/>. */ |
da8ca43d JT |
21 | |
22 | #include "defs.h" | |
2ca8ae21 | 23 | #include "frame.h" |
3beabdb2 MK |
24 | #include "gdbcore.h" |
25 | #include "osabi.h" | |
8513dd2d | 26 | #include "regcache.h" |
3beabdb2 | 27 | #include "regset.h" |
da8ca43d | 28 | #include "value.h" |
da8ca43d JT |
29 | |
30 | #include "alpha-tdep.h" | |
8513dd2d | 31 | #include "alphabsd-tdep.h" |
ea5bc2a6 | 32 | #include "nbsd-tdep.h" |
527ca6bb | 33 | #include "solib-svr4.h" |
effa26a9 | 34 | #include "target.h" |
8513dd2d | 35 | |
3beabdb2 MK |
36 | /* Core file support. */ |
37 | ||
38 | /* Even though NetBSD/alpha used ELF since day one, it used the | |
39 | traditional a.out-style core dump format before NetBSD 1.6. */ | |
40 | ||
41 | /* Sizeof `struct reg' in <machine/reg.h>. */ | |
42 | #define ALPHANBSD_SIZEOF_GREGS (32 * 8) | |
43 | ||
44 | /* Sizeof `struct fpreg' in <machine/reg.h. */ | |
45 | #define ALPHANBSD_SIZEOF_FPREGS ((32 * 8) + 8) | |
46 | ||
47 | /* Supply register REGNUM from the buffer specified by FPREGS and LEN | |
48 | in the floating-point register set REGSET to register cache | |
49 | REGCACHE. If REGNUM is -1, do this for all registers in REGSET. */ | |
50 | ||
8513dd2d | 51 | static void |
3beabdb2 MK |
52 | alphanbsd_supply_fpregset (const struct regset *regset, |
53 | struct regcache *regcache, | |
54 | int regnum, const void *fpregs, size_t len) | |
8513dd2d | 55 | { |
3beabdb2 MK |
56 | const gdb_byte *regs = fpregs; |
57 | int i; | |
58 | ||
59 | gdb_assert (len >= ALPHANBSD_SIZEOF_FPREGS); | |
60 | ||
61 | for (i = ALPHA_FP0_REGNUM; i < ALPHA_FP0_REGNUM + 31; i++) | |
62 | { | |
63 | if (regnum == i || regnum == -1) | |
64 | regcache_raw_supply (regcache, i, regs + (i - ALPHA_FP0_REGNUM) * 8); | |
65 | } | |
66 | ||
67 | if (regnum == ALPHA_FPCR_REGNUM || regnum == -1) | |
68 | regcache_raw_supply (regcache, ALPHA_FPCR_REGNUM, regs + 32 * 8); | |
69 | } | |
70 | ||
71 | /* Supply register REGNUM from the buffer specified by GREGS and LEN | |
72 | in the general-purpose register set REGSET to register cache | |
73 | REGCACHE. If REGNUM is -1, do this for all registers in REGSET. */ | |
8513dd2d | 74 | |
3beabdb2 MK |
75 | static void |
76 | alphanbsd_supply_gregset (const struct regset *regset, | |
77 | struct regcache *regcache, | |
78 | int regnum, const void *gregs, size_t len) | |
79 | { | |
80 | const gdb_byte *regs = gregs; | |
81 | int i; | |
82 | ||
83 | gdb_assert (len >= ALPHANBSD_SIZEOF_GREGS); | |
84 | ||
85 | for (i = 0; i < ALPHA_ZERO_REGNUM; i++) | |
86 | { | |
87 | if (regnum == i || regnum == -1) | |
88 | regcache_raw_supply (regcache, i, regs + i * 8); | |
89 | } | |
90 | ||
91 | if (regnum == ALPHA_PC_REGNUM || regnum == -1) | |
92 | regcache_raw_supply (regcache, ALPHA_PC_REGNUM, regs + 31 * 8); | |
93 | } | |
94 | ||
95 | /* Supply register REGNUM from the buffer specified by GREGS and LEN | |
96 | in the general-purpose register set REGSET to register cache | |
97 | REGCACHE. If REGNUM is -1, do this for all registers in REGSET. */ | |
98 | ||
99 | static void | |
100 | alphanbsd_aout_supply_gregset (const struct regset *regset, | |
101 | struct regcache *regcache, | |
102 | int regnum, const void *gregs, size_t len) | |
103 | { | |
104 | const gdb_byte *regs = gregs; | |
105 | int i; | |
106 | ||
107 | /* Table to map a GDB register number to a trapframe register index. */ | |
8513dd2d JT |
108 | static const int regmap[] = |
109 | { | |
110 | 0, 1, 2, 3, | |
111 | 4, 5, 6, 7, | |
112 | 8, 9, 10, 11, | |
113 | 12, 13, 14, 15, | |
114 | 30, 31, 32, 16, | |
115 | 17, 18, 19, 20, | |
116 | 21, 22, 23, 24, | |
117 | 25, 29, 26 | |
118 | }; | |
8513dd2d | 119 | |
3beabdb2 | 120 | gdb_assert (len >= ALPHANBSD_SIZEOF_GREGS); |
8513dd2d | 121 | |
3beabdb2 | 122 | for (i = 0; i < ARRAY_SIZE(regmap); i++) |
8513dd2d | 123 | { |
3beabdb2 MK |
124 | if (regnum == i || regnum == -1) |
125 | regcache_raw_supply (regcache, i, regs + regmap[i] * 8); | |
8513dd2d JT |
126 | } |
127 | ||
3beabdb2 MK |
128 | if (regnum == ALPHA_PC_REGNUM || regnum == -1) |
129 | regcache_raw_supply (regcache, ALPHA_PC_REGNUM, regs + 31 * 8); | |
8513dd2d | 130 | |
3beabdb2 | 131 | if (len >= ALPHANBSD_SIZEOF_GREGS + ALPHANBSD_SIZEOF_FPREGS) |
8513dd2d | 132 | { |
3beabdb2 MK |
133 | regs += ALPHANBSD_SIZEOF_GREGS; |
134 | len -= ALPHANBSD_SIZEOF_GREGS; | |
135 | alphanbsd_supply_fpregset (regset, regcache, regnum, regs, len); | |
8513dd2d JT |
136 | } |
137 | } | |
138 | ||
3beabdb2 MK |
139 | /* NetBSD/alpha register sets. */ |
140 | ||
3ca7dae4 | 141 | static const struct regset alphanbsd_gregset = |
8513dd2d | 142 | { |
3beabdb2 MK |
143 | NULL, |
144 | alphanbsd_supply_gregset | |
8513dd2d JT |
145 | }; |
146 | ||
3ca7dae4 | 147 | static const struct regset alphanbsd_fpregset = |
8513dd2d | 148 | { |
3beabdb2 MK |
149 | NULL, |
150 | alphanbsd_supply_fpregset | |
8513dd2d | 151 | }; |
da8ca43d | 152 | |
3ca7dae4 | 153 | static const struct regset alphanbsd_aout_gregset = |
3beabdb2 MK |
154 | { |
155 | NULL, | |
156 | alphanbsd_aout_supply_gregset | |
157 | }; | |
158 | ||
159 | /* Return the appropriate register set for the core section identified | |
160 | by SECT_NAME and SECT_SIZE. */ | |
161 | ||
b0ca8573 | 162 | const struct regset * |
3beabdb2 MK |
163 | alphanbsd_regset_from_core_section (struct gdbarch *gdbarch, |
164 | const char *sect_name, size_t sect_size) | |
165 | { | |
166 | if (strcmp (sect_name, ".reg") == 0 && sect_size >= ALPHANBSD_SIZEOF_GREGS) | |
b0ca8573 MK |
167 | { |
168 | if (sect_size >= ALPHANBSD_SIZEOF_GREGS + ALPHANBSD_SIZEOF_FPREGS) | |
169 | return &alphanbsd_aout_gregset; | |
170 | else | |
171 | return &alphanbsd_gregset; | |
172 | } | |
3beabdb2 MK |
173 | |
174 | if (strcmp (sect_name, ".reg2") == 0 && sect_size >= ALPHANBSD_SIZEOF_FPREGS) | |
175 | return &alphanbsd_fpregset; | |
176 | ||
177 | return NULL; | |
178 | } | |
3beabdb2 MK |
179 | \f |
180 | ||
181 | /* Signal trampolines. */ | |
182 | ||
da8ca43d JT |
183 | /* Under NetBSD/alpha, signal handler invocations can be identified by the |
184 | designated code sequence that is used to return from a signal handler. | |
185 | In particular, the return address of a signal handler points to the | |
186 | following code sequence: | |
187 | ||
188 | ldq a0, 0(sp) | |
189 | lda sp, 16(sp) | |
190 | lda v0, 295(zero) # __sigreturn14 | |
191 | call_pal callsys | |
192 | ||
193 | Each instruction has a unique encoding, so we simply attempt to match | |
194 | the instruction the PC is pointing to with any of the above instructions. | |
195 | If there is a hit, we know the offset to the start of the designated | |
196 | sequence and can then check whether we really are executing in the | |
197 | signal trampoline. If not, -1 is returned, otherwise the offset from the | |
198 | start of the return sequence is returned. */ | |
948f8e3d | 199 | static const gdb_byte sigtramp_retcode[] = |
da8ca43d | 200 | { |
cfef91e4 JT |
201 | 0x00, 0x00, 0x1e, 0xa6, /* ldq a0, 0(sp) */ |
202 | 0x10, 0x00, 0xde, 0x23, /* lda sp, 16(sp) */ | |
203 | 0x27, 0x01, 0x1f, 0x20, /* lda v0, 295(zero) */ | |
204 | 0x83, 0x00, 0x00, 0x00, /* call_pal callsys */ | |
da8ca43d | 205 | }; |
cfef91e4 JT |
206 | #define RETCODE_NWORDS 4 |
207 | #define RETCODE_SIZE (RETCODE_NWORDS * 4) | |
da8ca43d | 208 | |
b0ca8573 | 209 | static LONGEST |
e17a4113 | 210 | alphanbsd_sigtramp_offset (struct gdbarch *gdbarch, CORE_ADDR pc) |
da8ca43d | 211 | { |
948f8e3d | 212 | gdb_byte ret[RETCODE_SIZE], w[4]; |
da8ca43d JT |
213 | LONGEST off; |
214 | int i; | |
215 | ||
948f8e3d | 216 | if (target_read_memory (pc, w, 4) != 0) |
da8ca43d JT |
217 | return -1; |
218 | ||
219 | for (i = 0; i < RETCODE_NWORDS; i++) | |
220 | { | |
cfef91e4 | 221 | if (memcmp (w, sigtramp_retcode + (i * 4), 4) == 0) |
da8ca43d JT |
222 | break; |
223 | } | |
224 | if (i == RETCODE_NWORDS) | |
225 | return (-1); | |
226 | ||
227 | off = i * 4; | |
228 | pc -= off; | |
229 | ||
948f8e3d | 230 | if (target_read_memory (pc, ret, sizeof (ret)) != 0) |
da8ca43d JT |
231 | return -1; |
232 | ||
cfef91e4 | 233 | if (memcmp (ret, sigtramp_retcode, RETCODE_SIZE) == 0) |
da8ca43d JT |
234 | return off; |
235 | ||
236 | return -1; | |
237 | } | |
238 | ||
6c72f9f9 | 239 | static int |
e17a4113 | 240 | alphanbsd_pc_in_sigtramp (struct gdbarch *gdbarch, |
2c02bd72 | 241 | CORE_ADDR pc, const char *func_name) |
6c72f9f9 | 242 | { |
3d9b49b0 | 243 | return (nbsd_pc_in_sigtramp (pc, func_name) |
e17a4113 | 244 | || alphanbsd_sigtramp_offset (gdbarch, pc) >= 0); |
6c72f9f9 JT |
245 | } |
246 | ||
2ca8ae21 JT |
247 | static CORE_ADDR |
248 | alphanbsd_sigcontext_addr (struct frame_info *frame) | |
249 | { | |
250 | /* FIXME: This is not correct for all versions of NetBSD/alpha. | |
251 | We will probably need to disassemble the trampoline to figure | |
252 | out which trampoline frame type we have. */ | |
94afd7a6 UW |
253 | if (!get_next_frame (frame)) |
254 | return 0; | |
255 | return get_frame_base (get_next_frame (frame)); | |
2ca8ae21 | 256 | } |
b0ca8573 | 257 | \f |
2ca8ae21 | 258 | |
da8ca43d JT |
259 | static void |
260 | alphanbsd_init_abi (struct gdbarch_info info, | |
261 | struct gdbarch *gdbarch) | |
262 | { | |
263 | struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch); | |
264 | ||
baa490c4 RH |
265 | /* Hook into the DWARF CFI frame unwinder. */ |
266 | alpha_dwarf2_init_abi (info, gdbarch); | |
267 | ||
268 | /* Hook into the MDEBUG frame unwinder. */ | |
269 | alpha_mdebug_init_abi (info, gdbarch); | |
270 | ||
da8ca43d JT |
271 | /* NetBSD/alpha does not provide single step support via ptrace(2); we |
272 | must use software single-stepping. */ | |
273 | set_gdbarch_software_single_step (gdbarch, alpha_software_single_step); | |
274 | ||
789f3b5f MK |
275 | /* NetBSD/alpha has SVR4-style shared libraries. */ |
276 | set_solib_svr4_fetch_link_map_offsets | |
277 | (gdbarch, svr4_lp64_fetch_link_map_offsets); | |
da8ca43d JT |
278 | |
279 | tdep->dynamic_sigtramp_offset = alphanbsd_sigtramp_offset; | |
f2524b93 | 280 | tdep->pc_in_sigtramp = alphanbsd_pc_in_sigtramp; |
2ca8ae21 | 281 | tdep->sigcontext_addr = alphanbsd_sigcontext_addr; |
accc6d1f JT |
282 | |
283 | tdep->jb_pc = 2; | |
284 | tdep->jb_elt_size = 8; | |
3beabdb2 MK |
285 | |
286 | set_gdbarch_regset_from_core_section | |
287 | (gdbarch, alphanbsd_regset_from_core_section); | |
288 | } | |
3beabdb2 MK |
289 | \f |
290 | ||
291 | static enum gdb_osabi | |
292 | alphanbsd_core_osabi_sniffer (bfd *abfd) | |
293 | { | |
294 | if (strcmp (bfd_get_target (abfd), "netbsd-core") == 0) | |
b0ca8573 | 295 | return GDB_OSABI_NETBSD_ELF; |
3beabdb2 MK |
296 | |
297 | return GDB_OSABI_UNKNOWN; | |
298 | } | |
299 | \f | |
300 | ||
301 | /* Provide a prototype to silence -Wmissing-prototypes. */ | |
302 | void _initialize_alphanbsd_tdep (void); | |
da8ca43d JT |
303 | |
304 | void | |
305 | _initialize_alphanbsd_tdep (void) | |
306 | { | |
3beabdb2 MK |
307 | /* BFD doesn't set a flavour for NetBSD style a.out core files. */ |
308 | gdbarch_register_osabi_sniffer (bfd_arch_alpha, bfd_target_unknown_flavour, | |
309 | alphanbsd_core_osabi_sniffer); | |
310 | ||
05816f70 | 311 | gdbarch_register_osabi (bfd_arch_alpha, 0, GDB_OSABI_NETBSD_ELF, |
70f80edf | 312 | alphanbsd_init_abi); |
da8ca43d | 313 | } |