Commit | Line | Data |
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789f3b5f MK |
1 | /* Target-dependent code for NetBSD/alpha. |
2 | ||
6aba47ca | 3 | Copyright (C) 2002, 2003, 2004, 2006, 2007 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 | 29 | |
3beabdb2 | 30 | #include "gdb_assert.h" |
cca0d3b0 | 31 | #include "gdb_string.h" |
9964235a | 32 | |
da8ca43d | 33 | #include "alpha-tdep.h" |
8513dd2d | 34 | #include "alphabsd-tdep.h" |
ea5bc2a6 | 35 | #include "nbsd-tdep.h" |
527ca6bb | 36 | #include "solib-svr4.h" |
8513dd2d | 37 | |
3beabdb2 MK |
38 | /* Core file support. */ |
39 | ||
40 | /* Even though NetBSD/alpha used ELF since day one, it used the | |
41 | traditional a.out-style core dump format before NetBSD 1.6. */ | |
42 | ||
43 | /* Sizeof `struct reg' in <machine/reg.h>. */ | |
44 | #define ALPHANBSD_SIZEOF_GREGS (32 * 8) | |
45 | ||
46 | /* Sizeof `struct fpreg' in <machine/reg.h. */ | |
47 | #define ALPHANBSD_SIZEOF_FPREGS ((32 * 8) + 8) | |
48 | ||
49 | /* Supply register REGNUM from the buffer specified by FPREGS and LEN | |
50 | in the floating-point register set REGSET to register cache | |
51 | REGCACHE. If REGNUM is -1, do this for all registers in REGSET. */ | |
52 | ||
8513dd2d | 53 | static void |
3beabdb2 MK |
54 | alphanbsd_supply_fpregset (const struct regset *regset, |
55 | struct regcache *regcache, | |
56 | int regnum, const void *fpregs, size_t len) | |
8513dd2d | 57 | { |
3beabdb2 MK |
58 | const gdb_byte *regs = fpregs; |
59 | int i; | |
60 | ||
61 | gdb_assert (len >= ALPHANBSD_SIZEOF_FPREGS); | |
62 | ||
63 | for (i = ALPHA_FP0_REGNUM; i < ALPHA_FP0_REGNUM + 31; i++) | |
64 | { | |
65 | if (regnum == i || regnum == -1) | |
66 | regcache_raw_supply (regcache, i, regs + (i - ALPHA_FP0_REGNUM) * 8); | |
67 | } | |
68 | ||
69 | if (regnum == ALPHA_FPCR_REGNUM || regnum == -1) | |
70 | regcache_raw_supply (regcache, ALPHA_FPCR_REGNUM, regs + 32 * 8); | |
71 | } | |
72 | ||
73 | /* Supply register REGNUM from the buffer specified by GREGS and LEN | |
74 | in the general-purpose register set REGSET to register cache | |
75 | REGCACHE. If REGNUM is -1, do this for all registers in REGSET. */ | |
8513dd2d | 76 | |
3beabdb2 MK |
77 | static void |
78 | alphanbsd_supply_gregset (const struct regset *regset, | |
79 | struct regcache *regcache, | |
80 | int regnum, const void *gregs, size_t len) | |
81 | { | |
82 | const gdb_byte *regs = gregs; | |
83 | int i; | |
84 | ||
85 | gdb_assert (len >= ALPHANBSD_SIZEOF_GREGS); | |
86 | ||
87 | for (i = 0; i < ALPHA_ZERO_REGNUM; i++) | |
88 | { | |
89 | if (regnum == i || regnum == -1) | |
90 | regcache_raw_supply (regcache, i, regs + i * 8); | |
91 | } | |
92 | ||
93 | if (regnum == ALPHA_PC_REGNUM || regnum == -1) | |
94 | regcache_raw_supply (regcache, ALPHA_PC_REGNUM, regs + 31 * 8); | |
95 | } | |
96 | ||
97 | /* Supply register REGNUM from the buffer specified by GREGS and LEN | |
98 | in the general-purpose register set REGSET to register cache | |
99 | REGCACHE. If REGNUM is -1, do this for all registers in REGSET. */ | |
100 | ||
101 | static void | |
102 | alphanbsd_aout_supply_gregset (const struct regset *regset, | |
103 | struct regcache *regcache, | |
104 | int regnum, const void *gregs, size_t len) | |
105 | { | |
106 | const gdb_byte *regs = gregs; | |
107 | int i; | |
108 | ||
109 | /* Table to map a GDB register number to a trapframe register index. */ | |
8513dd2d JT |
110 | static const int regmap[] = |
111 | { | |
112 | 0, 1, 2, 3, | |
113 | 4, 5, 6, 7, | |
114 | 8, 9, 10, 11, | |
115 | 12, 13, 14, 15, | |
116 | 30, 31, 32, 16, | |
117 | 17, 18, 19, 20, | |
118 | 21, 22, 23, 24, | |
119 | 25, 29, 26 | |
120 | }; | |
8513dd2d | 121 | |
3beabdb2 | 122 | gdb_assert (len >= ALPHANBSD_SIZEOF_GREGS); |
8513dd2d | 123 | |
3beabdb2 | 124 | for (i = 0; i < ARRAY_SIZE(regmap); i++) |
8513dd2d | 125 | { |
3beabdb2 MK |
126 | if (regnum == i || regnum == -1) |
127 | regcache_raw_supply (regcache, i, regs + regmap[i] * 8); | |
8513dd2d JT |
128 | } |
129 | ||
3beabdb2 MK |
130 | if (regnum == ALPHA_PC_REGNUM || regnum == -1) |
131 | regcache_raw_supply (regcache, ALPHA_PC_REGNUM, regs + 31 * 8); | |
8513dd2d | 132 | |
3beabdb2 | 133 | if (len >= ALPHANBSD_SIZEOF_GREGS + ALPHANBSD_SIZEOF_FPREGS) |
8513dd2d | 134 | { |
3beabdb2 MK |
135 | regs += ALPHANBSD_SIZEOF_GREGS; |
136 | len -= ALPHANBSD_SIZEOF_GREGS; | |
137 | alphanbsd_supply_fpregset (regset, regcache, regnum, regs, len); | |
8513dd2d JT |
138 | } |
139 | } | |
140 | ||
3beabdb2 MK |
141 | /* NetBSD/alpha register sets. */ |
142 | ||
143 | static struct regset alphanbsd_gregset = | |
8513dd2d | 144 | { |
3beabdb2 MK |
145 | NULL, |
146 | alphanbsd_supply_gregset | |
8513dd2d JT |
147 | }; |
148 | ||
3beabdb2 | 149 | static struct regset alphanbsd_fpregset = |
8513dd2d | 150 | { |
3beabdb2 MK |
151 | NULL, |
152 | alphanbsd_supply_fpregset | |
8513dd2d | 153 | }; |
da8ca43d | 154 | |
3beabdb2 MK |
155 | static struct regset alphanbsd_aout_gregset = |
156 | { | |
157 | NULL, | |
158 | alphanbsd_aout_supply_gregset | |
159 | }; | |
160 | ||
161 | /* Return the appropriate register set for the core section identified | |
162 | by SECT_NAME and SECT_SIZE. */ | |
163 | ||
b0ca8573 | 164 | const struct regset * |
3beabdb2 MK |
165 | alphanbsd_regset_from_core_section (struct gdbarch *gdbarch, |
166 | const char *sect_name, size_t sect_size) | |
167 | { | |
168 | if (strcmp (sect_name, ".reg") == 0 && sect_size >= ALPHANBSD_SIZEOF_GREGS) | |
b0ca8573 MK |
169 | { |
170 | if (sect_size >= ALPHANBSD_SIZEOF_GREGS + ALPHANBSD_SIZEOF_FPREGS) | |
171 | return &alphanbsd_aout_gregset; | |
172 | else | |
173 | return &alphanbsd_gregset; | |
174 | } | |
3beabdb2 MK |
175 | |
176 | if (strcmp (sect_name, ".reg2") == 0 && sect_size >= ALPHANBSD_SIZEOF_FPREGS) | |
177 | return &alphanbsd_fpregset; | |
178 | ||
179 | return NULL; | |
180 | } | |
3beabdb2 MK |
181 | \f |
182 | ||
183 | /* Signal trampolines. */ | |
184 | ||
da8ca43d JT |
185 | /* Under NetBSD/alpha, signal handler invocations can be identified by the |
186 | designated code sequence that is used to return from a signal handler. | |
187 | In particular, the return address of a signal handler points to the | |
188 | following code sequence: | |
189 | ||
190 | ldq a0, 0(sp) | |
191 | lda sp, 16(sp) | |
192 | lda v0, 295(zero) # __sigreturn14 | |
193 | call_pal callsys | |
194 | ||
195 | Each instruction has a unique encoding, so we simply attempt to match | |
196 | the instruction the PC is pointing to with any of the above instructions. | |
197 | If there is a hit, we know the offset to the start of the designated | |
198 | sequence and can then check whether we really are executing in the | |
199 | signal trampoline. If not, -1 is returned, otherwise the offset from the | |
200 | start of the return sequence is returned. */ | |
cfef91e4 | 201 | static const unsigned char sigtramp_retcode[] = |
da8ca43d | 202 | { |
cfef91e4 JT |
203 | 0x00, 0x00, 0x1e, 0xa6, /* ldq a0, 0(sp) */ |
204 | 0x10, 0x00, 0xde, 0x23, /* lda sp, 16(sp) */ | |
205 | 0x27, 0x01, 0x1f, 0x20, /* lda v0, 295(zero) */ | |
206 | 0x83, 0x00, 0x00, 0x00, /* call_pal callsys */ | |
da8ca43d | 207 | }; |
cfef91e4 JT |
208 | #define RETCODE_NWORDS 4 |
209 | #define RETCODE_SIZE (RETCODE_NWORDS * 4) | |
da8ca43d | 210 | |
b0ca8573 | 211 | static LONGEST |
da8ca43d JT |
212 | alphanbsd_sigtramp_offset (CORE_ADDR pc) |
213 | { | |
cfef91e4 | 214 | unsigned char ret[RETCODE_SIZE], w[4]; |
da8ca43d JT |
215 | LONGEST off; |
216 | int i; | |
217 | ||
359a9262 | 218 | if (read_memory_nobpt (pc, (char *) w, 4) != 0) |
da8ca43d JT |
219 | return -1; |
220 | ||
221 | for (i = 0; i < RETCODE_NWORDS; i++) | |
222 | { | |
cfef91e4 | 223 | if (memcmp (w, sigtramp_retcode + (i * 4), 4) == 0) |
da8ca43d JT |
224 | break; |
225 | } | |
226 | if (i == RETCODE_NWORDS) | |
227 | return (-1); | |
228 | ||
229 | off = i * 4; | |
230 | pc -= off; | |
231 | ||
359a9262 | 232 | if (read_memory_nobpt (pc, (char *) ret, sizeof (ret)) != 0) |
da8ca43d JT |
233 | return -1; |
234 | ||
cfef91e4 | 235 | if (memcmp (ret, sigtramp_retcode, RETCODE_SIZE) == 0) |
da8ca43d JT |
236 | return off; |
237 | ||
238 | return -1; | |
239 | } | |
240 | ||
6c72f9f9 JT |
241 | static int |
242 | alphanbsd_pc_in_sigtramp (CORE_ADDR pc, char *func_name) | |
243 | { | |
3d9b49b0 JT |
244 | return (nbsd_pc_in_sigtramp (pc, func_name) |
245 | || alphanbsd_sigtramp_offset (pc) >= 0); | |
6c72f9f9 JT |
246 | } |
247 | ||
2ca8ae21 JT |
248 | static CORE_ADDR |
249 | alphanbsd_sigcontext_addr (struct frame_info *frame) | |
250 | { | |
251 | /* FIXME: This is not correct for all versions of NetBSD/alpha. | |
252 | We will probably need to disassemble the trampoline to figure | |
253 | out which trampoline frame type we have. */ | |
f534e522 | 254 | return get_frame_base (frame); |
2ca8ae21 | 255 | } |
b0ca8573 | 256 | \f |
2ca8ae21 | 257 | |
da8ca43d JT |
258 | static void |
259 | alphanbsd_init_abi (struct gdbarch_info info, | |
260 | struct gdbarch *gdbarch) | |
261 | { | |
262 | struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch); | |
263 | ||
baa490c4 RH |
264 | /* Hook into the DWARF CFI frame unwinder. */ |
265 | alpha_dwarf2_init_abi (info, gdbarch); | |
266 | ||
267 | /* Hook into the MDEBUG frame unwinder. */ | |
268 | alpha_mdebug_init_abi (info, gdbarch); | |
269 | ||
da8ca43d JT |
270 | /* NetBSD/alpha does not provide single step support via ptrace(2); we |
271 | must use software single-stepping. */ | |
272 | set_gdbarch_software_single_step (gdbarch, alpha_software_single_step); | |
273 | ||
789f3b5f MK |
274 | /* NetBSD/alpha has SVR4-style shared libraries. */ |
275 | set_solib_svr4_fetch_link_map_offsets | |
276 | (gdbarch, svr4_lp64_fetch_link_map_offsets); | |
da8ca43d JT |
277 | |
278 | tdep->dynamic_sigtramp_offset = alphanbsd_sigtramp_offset; | |
f2524b93 | 279 | tdep->pc_in_sigtramp = alphanbsd_pc_in_sigtramp; |
2ca8ae21 | 280 | tdep->sigcontext_addr = alphanbsd_sigcontext_addr; |
accc6d1f JT |
281 | |
282 | tdep->jb_pc = 2; | |
283 | tdep->jb_elt_size = 8; | |
3beabdb2 MK |
284 | |
285 | set_gdbarch_regset_from_core_section | |
286 | (gdbarch, alphanbsd_regset_from_core_section); | |
287 | } | |
3beabdb2 MK |
288 | \f |
289 | ||
290 | static enum gdb_osabi | |
291 | alphanbsd_core_osabi_sniffer (bfd *abfd) | |
292 | { | |
293 | if (strcmp (bfd_get_target (abfd), "netbsd-core") == 0) | |
b0ca8573 | 294 | return GDB_OSABI_NETBSD_ELF; |
3beabdb2 MK |
295 | |
296 | return GDB_OSABI_UNKNOWN; | |
297 | } | |
298 | \f | |
299 | ||
300 | /* Provide a prototype to silence -Wmissing-prototypes. */ | |
301 | void _initialize_alphanbsd_tdep (void); | |
da8ca43d JT |
302 | |
303 | void | |
304 | _initialize_alphanbsd_tdep (void) | |
305 | { | |
3beabdb2 MK |
306 | /* BFD doesn't set a flavour for NetBSD style a.out core files. */ |
307 | gdbarch_register_osabi_sniffer (bfd_arch_alpha, bfd_target_unknown_flavour, | |
308 | alphanbsd_core_osabi_sniffer); | |
309 | ||
05816f70 | 310 | gdbarch_register_osabi (bfd_arch_alpha, 0, GDB_OSABI_NETBSD_ELF, |
70f80edf | 311 | alphanbsd_init_abi); |
da8ca43d | 312 | } |