Commit | Line | Data |
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386c036b MK |
1 | /* Target-dependent code for NetBSD/sparc. |
2 | ||
6aba47ca | 3 | Copyright (C) 2002, 2003, 2004, 2006, 2007 Free Software Foundation, Inc. |
9ce5c36a JT |
4 | Contributed by Wasabi Systems, 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 | |
a9762ec7 | 10 | the Free Software Foundation; either version 3 of the License, or |
9ce5c36a JT |
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 | |
a9762ec7 | 19 | along with this program. If not, see <http://www.gnu.org/licenses/>. */ |
9ce5c36a JT |
20 | |
21 | #include "defs.h" | |
386c036b MK |
22 | #include "frame.h" |
23 | #include "frame-unwind.h" | |
9ce5c36a | 24 | #include "gdbcore.h" |
3e461478 | 25 | #include "gdbtypes.h" |
9ce5c36a | 26 | #include "osabi.h" |
386c036b | 27 | #include "regcache.h" |
4e7b0cd3 | 28 | #include "regset.h" |
386c036b MK |
29 | #include "solib-svr4.h" |
30 | #include "symtab.h" | |
31 | #include "trad-frame.h" | |
9ce5c36a | 32 | |
386c036b | 33 | #include "gdb_assert.h" |
f6ad61e3 MK |
34 | #include "gdb_string.h" |
35 | ||
c139e7d9 | 36 | #include "sparc-tdep.h" |
9ce5c36a JT |
37 | #include "nbsd-tdep.h" |
38 | ||
c893be75 MK |
39 | /* Macros to extract fields from SPARC instructions. */ |
40 | #define X_RS1(i) (((i) >> 14) & 0x1f) | |
41 | #define X_RS2(i) ((i) & 0x1f) | |
42 | #define X_I(i) (((i) >> 13) & 1) | |
43 | ||
386c036b | 44 | const struct sparc_gregset sparc32nbsd_gregset = |
9ce5c36a | 45 | { |
386c036b MK |
46 | 0 * 4, /* %psr */ |
47 | 1 * 4, /* %pc */ | |
48 | 2 * 4, /* %npc */ | |
49 | 3 * 4, /* %y */ | |
50 | -1, /* %wim */ | |
51 | -1, /* %tbr */ | |
52 | 5 * 4, /* %g1 */ | |
53 | -1 /* %l0 */ | |
54 | }; | |
9ce5c36a | 55 | |
9ce5c36a | 56 | static void |
4e7b0cd3 MK |
57 | sparc32nbsd_supply_gregset (const struct regset *regset, |
58 | struct regcache *regcache, | |
59 | int regnum, const void *gregs, size_t len) | |
9ce5c36a | 60 | { |
9ea75c57 | 61 | sparc32_supply_gregset (&sparc32nbsd_gregset, regcache, regnum, gregs); |
c8e737d5 MK |
62 | |
63 | /* Traditional NetBSD core files don't use multiple register sets. | |
64 | Instead, the general-purpose and floating-point registers are | |
65 | lumped together in a single section. */ | |
66 | if (len >= 212) | |
67 | sparc32_supply_fpregset (regcache, regnum, (const char *) gregs + 80); | |
9ce5c36a JT |
68 | } |
69 | ||
4e7b0cd3 MK |
70 | static void |
71 | sparc32nbsd_supply_fpregset (const struct regset *regset, | |
72 | struct regcache *regcache, | |
73 | int regnum, const void *fpregs, size_t len) | |
9ce5c36a | 74 | { |
4e7b0cd3 MK |
75 | sparc32_supply_fpregset (regcache, regnum, fpregs); |
76 | } | |
9ce5c36a | 77 | |
386c036b MK |
78 | \f |
79 | /* Signal trampolines. */ | |
80 | ||
81 | /* The following variables describe the location of an on-stack signal | |
82 | trampoline. The current values correspond to the memory layout for | |
83 | NetBSD 1.3 and up. These shouldn't be necessary for NetBSD 2.0 and | |
84 | up, since NetBSD uses signal trampolines provided by libc now. */ | |
9ce5c36a | 85 | |
386c036b MK |
86 | static const CORE_ADDR sparc32nbsd_sigtramp_start = 0xeffffef0; |
87 | static const CORE_ADDR sparc32nbsd_sigtramp_end = 0xeffffff0; | |
9ce5c36a JT |
88 | |
89 | static int | |
386c036b MK |
90 | sparc32nbsd_pc_in_sigtramp (CORE_ADDR pc, char *name) |
91 | { | |
92 | if (pc >= sparc32nbsd_sigtramp_start && pc < sparc32nbsd_sigtramp_end) | |
93 | return 1; | |
94 | ||
95 | return nbsd_pc_in_sigtramp (pc, name); | |
96 | } | |
97 | ||
566626fa MK |
98 | struct trad_frame_saved_reg * |
99 | sparc32nbsd_sigcontext_saved_regs (struct frame_info *next_frame) | |
9ce5c36a | 100 | { |
566626fa | 101 | struct trad_frame_saved_reg *saved_regs; |
386c036b | 102 | CORE_ADDR addr, sigcontext_addr; |
386c036b | 103 | int regnum, delta; |
566626fa | 104 | ULONGEST psr; |
9ce5c36a | 105 | |
566626fa | 106 | saved_regs = trad_frame_alloc_saved_regs (next_frame); |
9ce5c36a | 107 | |
566626fa MK |
108 | /* We find the appropriate instance of `struct sigcontext' at a |
109 | fixed offset in the signal frame. */ | |
110 | addr = frame_unwind_register_unsigned (next_frame, SPARC_FP_REGNUM); | |
111 | sigcontext_addr = addr + 64 + 16; | |
9ce5c36a | 112 | |
386c036b MK |
113 | /* The registers are saved in bits and pieces scattered all over the |
114 | place. The code below records their location on the assumption | |
115 | that the part of the signal trampoline that saves the state has | |
116 | been executed. */ | |
9ce5c36a | 117 | |
566626fa MK |
118 | saved_regs[SPARC_SP_REGNUM].addr = sigcontext_addr + 8; |
119 | saved_regs[SPARC32_PC_REGNUM].addr = sigcontext_addr + 12; | |
120 | saved_regs[SPARC32_NPC_REGNUM].addr = sigcontext_addr + 16; | |
121 | saved_regs[SPARC32_PSR_REGNUM].addr = sigcontext_addr + 20; | |
122 | saved_regs[SPARC_G1_REGNUM].addr = sigcontext_addr + 24; | |
123 | saved_regs[SPARC_O0_REGNUM].addr = sigcontext_addr + 28; | |
386c036b MK |
124 | |
125 | /* The remaining `global' registers and %y are saved in the `local' | |
126 | registers. */ | |
127 | delta = SPARC_L0_REGNUM - SPARC_G0_REGNUM; | |
128 | for (regnum = SPARC_G2_REGNUM; regnum <= SPARC_G7_REGNUM; regnum++) | |
566626fa MK |
129 | saved_regs[regnum].realreg = regnum + delta; |
130 | saved_regs[SPARC32_Y_REGNUM].realreg = SPARC_L1_REGNUM; | |
386c036b MK |
131 | |
132 | /* The remaining `out' registers can be found in the current frame's | |
133 | `in' registers. */ | |
134 | delta = SPARC_I0_REGNUM - SPARC_O0_REGNUM; | |
135 | for (regnum = SPARC_O1_REGNUM; regnum <= SPARC_O5_REGNUM; regnum++) | |
566626fa MK |
136 | saved_regs[regnum].realreg = regnum + delta; |
137 | saved_regs[SPARC_O7_REGNUM].realreg = SPARC_I7_REGNUM; | |
386c036b MK |
138 | |
139 | /* The `local' and `in' registers have been saved in the register | |
140 | save area. */ | |
566626fa | 141 | addr = saved_regs[SPARC_SP_REGNUM].addr; |
386c036b MK |
142 | addr = get_frame_memory_unsigned (next_frame, addr, 4); |
143 | for (regnum = SPARC_L0_REGNUM; | |
144 | regnum <= SPARC_I7_REGNUM; regnum++, addr += 4) | |
566626fa | 145 | saved_regs[regnum].addr = addr; |
386c036b | 146 | |
1c800673 MK |
147 | /* Handle StackGhost. */ |
148 | { | |
149 | ULONGEST wcookie = sparc_fetch_wcookie (); | |
150 | ||
151 | if (wcookie != 0) | |
152 | { | |
153 | ULONGEST i7; | |
154 | ||
155 | addr = saved_regs[SPARC_I7_REGNUM].addr; | |
156 | i7 = get_frame_memory_unsigned (next_frame, addr, 4); | |
157 | trad_frame_set_value (saved_regs, SPARC_I7_REGNUM, i7 ^ wcookie); | |
158 | } | |
159 | } | |
160 | ||
386c036b MK |
161 | /* The floating-point registers are only saved if the EF bit in %prs |
162 | has been set. */ | |
163 | ||
164 | #define PSR_EF 0x00001000 | |
165 | ||
566626fa | 166 | addr = saved_regs[SPARC32_PSR_REGNUM].addr; |
386c036b MK |
167 | psr = get_frame_memory_unsigned (next_frame, addr, 4); |
168 | if (psr & PSR_EF) | |
169 | { | |
170 | CORE_ADDR sp; | |
171 | ||
172 | sp = frame_unwind_register_unsigned (next_frame, SPARC_SP_REGNUM); | |
566626fa | 173 | saved_regs[SPARC32_FSR_REGNUM].addr = sp + 96; |
386c036b MK |
174 | for (regnum = SPARC_F0_REGNUM, addr = sp + 96 + 8; |
175 | regnum <= SPARC_F31_REGNUM; regnum++, addr += 4) | |
566626fa MK |
176 | saved_regs[regnum].addr = addr; |
177 | } | |
178 | ||
179 | return saved_regs; | |
180 | } | |
181 | ||
182 | static struct sparc_frame_cache * | |
183 | sparc32nbsd_sigcontext_frame_cache (struct frame_info *next_frame, | |
184 | void **this_cache) | |
185 | { | |
186 | struct sparc_frame_cache *cache; | |
187 | CORE_ADDR addr; | |
188 | ||
189 | if (*this_cache) | |
190 | return *this_cache; | |
191 | ||
192 | cache = sparc_frame_cache (next_frame, this_cache); | |
193 | gdb_assert (cache == *this_cache); | |
194 | ||
195 | /* If we couldn't find the frame's function, we're probably dealing | |
196 | with an on-stack signal trampoline. */ | |
197 | if (cache->pc == 0) | |
198 | { | |
199 | cache->pc = sparc32nbsd_sigtramp_start; | |
200 | ||
201 | /* Since we couldn't find the frame's function, the cache was | |
202 | initialized under the assumption that we're frameless. */ | |
203 | cache->frameless_p = 0; | |
204 | addr = frame_unwind_register_unsigned (next_frame, SPARC_FP_REGNUM); | |
205 | cache->base = addr; | |
386c036b MK |
206 | } |
207 | ||
566626fa MK |
208 | cache->saved_regs = sparc32nbsd_sigcontext_saved_regs (next_frame); |
209 | ||
386c036b | 210 | return cache; |
9ce5c36a JT |
211 | } |
212 | ||
386c036b MK |
213 | static void |
214 | sparc32nbsd_sigcontext_frame_this_id (struct frame_info *next_frame, | |
215 | void **this_cache, | |
216 | struct frame_id *this_id) | |
217 | { | |
218 | struct sparc_frame_cache *cache = | |
219 | sparc32nbsd_sigcontext_frame_cache (next_frame, this_cache); | |
220 | ||
221 | (*this_id) = frame_id_build (cache->base, cache->pc); | |
222 | } | |
223 | ||
224 | static void | |
225 | sparc32nbsd_sigcontext_frame_prev_register (struct frame_info *next_frame, | |
226 | void **this_cache, | |
227 | int regnum, int *optimizedp, | |
228 | enum lval_type *lvalp, | |
229 | CORE_ADDR *addrp, | |
47ef841b | 230 | int *realnump, gdb_byte *valuep) |
9ce5c36a | 231 | { |
386c036b MK |
232 | struct sparc_frame_cache *cache = |
233 | sparc32nbsd_sigcontext_frame_cache (next_frame, this_cache); | |
9ce5c36a | 234 | |
1f67027d AC |
235 | trad_frame_get_prev_register (next_frame, cache->saved_regs, regnum, |
236 | optimizedp, lvalp, addrp, realnump, valuep); | |
386c036b | 237 | } |
9ce5c36a | 238 | |
386c036b MK |
239 | static const struct frame_unwind sparc32nbsd_sigcontext_frame_unwind = |
240 | { | |
241 | SIGTRAMP_FRAME, | |
242 | sparc32nbsd_sigcontext_frame_this_id, | |
243 | sparc32nbsd_sigcontext_frame_prev_register | |
244 | }; | |
9ce5c36a | 245 | |
386c036b MK |
246 | static const struct frame_unwind * |
247 | sparc32nbsd_sigtramp_frame_sniffer (struct frame_info *next_frame) | |
248 | { | |
249 | CORE_ADDR pc = frame_pc_unwind (next_frame); | |
250 | char *name; | |
9ce5c36a | 251 | |
386c036b MK |
252 | find_pc_partial_function (pc, &name, NULL, NULL); |
253 | if (sparc32nbsd_pc_in_sigtramp (pc, name)) | |
254 | { | |
255 | if (name == NULL || strncmp (name, "__sigtramp_sigcontext", 21)) | |
256 | return &sparc32nbsd_sigcontext_frame_unwind; | |
257 | } | |
258 | ||
259 | return NULL; | |
9ce5c36a | 260 | } |
386c036b | 261 | \f |
c893be75 MK |
262 | /* Return the address of a system call's alternative return |
263 | address. */ | |
264 | ||
265 | CORE_ADDR | |
0b1b3e42 | 266 | sparcnbsd_step_trap (struct frame_info *frame, unsigned long insn) |
c893be75 MK |
267 | { |
268 | if ((X_I (insn) == 0 && X_RS1 (insn) == 0 && X_RS2 (insn) == 0) | |
269 | || (X_I (insn) == 1 && X_RS1 (insn) == 0 && (insn & 0x7f) == 0)) | |
270 | { | |
271 | /* "New" system call. */ | |
0b1b3e42 | 272 | ULONGEST number = get_frame_register_unsigned (frame, SPARC_G1_REGNUM); |
c893be75 MK |
273 | |
274 | if (number & 0x400) | |
0b1b3e42 | 275 | return get_frame_register_unsigned (frame, SPARC_G2_REGNUM); |
c893be75 | 276 | if (number & 0x800) |
0b1b3e42 | 277 | return get_frame_register_unsigned (frame, SPARC_G7_REGNUM); |
c893be75 MK |
278 | } |
279 | ||
280 | return 0; | |
281 | } | |
282 | \f | |
386c036b | 283 | |
9ce5c36a | 284 | static void |
386c036b | 285 | sparc32nbsd_init_abi (struct gdbarch_info info, struct gdbarch *gdbarch) |
9ce5c36a | 286 | { |
4e7b0cd3 MK |
287 | struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch); |
288 | ||
386c036b MK |
289 | /* NetBSD doesn't support the 128-bit `long double' from the psABI. */ |
290 | set_gdbarch_long_double_bit (gdbarch, 64); | |
8da61cc4 | 291 | set_gdbarch_long_double_format (gdbarch, floatformats_ieee_double); |
386c036b | 292 | |
9ea75c57 | 293 | tdep->gregset = regset_alloc (gdbarch, sparc32nbsd_supply_gregset, NULL); |
c8e737d5 | 294 | tdep->sizeof_gregset = 20 * 4; |
4e7b0cd3 | 295 | |
9ea75c57 | 296 | tdep->fpregset = regset_alloc (gdbarch, sparc32nbsd_supply_fpregset, NULL); |
c8e737d5 | 297 | tdep->sizeof_fpregset = 33 * 4; |
4e7b0cd3 | 298 | |
c893be75 MK |
299 | /* Make sure we can single-step "new" syscalls. */ |
300 | tdep->step_trap = sparcnbsd_step_trap; | |
301 | ||
386c036b | 302 | frame_unwind_append_sniffer (gdbarch, sparc32nbsd_sigtramp_frame_sniffer); |
9ce5c36a JT |
303 | } |
304 | ||
305 | static void | |
386c036b | 306 | sparc32nbsd_aout_init_abi (struct gdbarch_info info, struct gdbarch *gdbarch) |
9ce5c36a | 307 | { |
386c036b | 308 | sparc32nbsd_init_abi (info, gdbarch); |
9ce5c36a JT |
309 | } |
310 | ||
19671c2b | 311 | void |
386c036b | 312 | sparc32nbsd_elf_init_abi (struct gdbarch_info info, struct gdbarch *gdbarch) |
9ce5c36a | 313 | { |
386c036b | 314 | sparc32nbsd_init_abi (info, gdbarch); |
9ce5c36a | 315 | |
386c036b | 316 | set_solib_svr4_fetch_link_map_offsets |
be24b061 | 317 | (gdbarch, svr4_ilp32_fetch_link_map_offsets); |
9ce5c36a JT |
318 | } |
319 | ||
320 | static enum gdb_osabi | |
321 | sparcnbsd_aout_osabi_sniffer (bfd *abfd) | |
322 | { | |
323 | if (strcmp (bfd_get_target (abfd), "a.out-sparc-netbsd") == 0) | |
324 | return GDB_OSABI_NETBSD_AOUT; | |
325 | ||
326 | return GDB_OSABI_UNKNOWN; | |
327 | } | |
328 | ||
7e5e9f88 MK |
329 | /* OpenBSD uses the traditional NetBSD core file format, even for |
330 | ports that use ELF. Therefore, if the default OS ABI is OpenBSD | |
331 | ELF, we return that instead of NetBSD a.out. This is mainly for | |
332 | the benfit of OpenBSD/sparc64, which inherits the sniffer below | |
333 | since we include this file for an OpenBSD/sparc64 target. For | |
334 | OpenBSD/sparc, the NetBSD a.out OS ABI is probably similar enough | |
335 | to both the OpenBSD a.out and the OpenBSD ELF OS ABI. */ | |
336 | #if defined (GDB_OSABI_DEFAULT) && (GDB_OSABI_DEFAULT == GDB_OSABI_OPENBSD_ELF) | |
337 | #define GDB_OSABI_NETBSD_CORE GDB_OSABI_OPENBSD_ELF | |
338 | #else | |
339 | #define GDB_OSABI_NETBSD_CORE GDB_OSABI_NETBSD_AOUT | |
340 | #endif | |
341 | ||
89aac506 MK |
342 | static enum gdb_osabi |
343 | sparcnbsd_core_osabi_sniffer (bfd *abfd) | |
344 | { | |
345 | if (strcmp (bfd_get_target (abfd), "netbsd-core") == 0) | |
7e5e9f88 | 346 | return GDB_OSABI_NETBSD_CORE; |
89aac506 MK |
347 | |
348 | return GDB_OSABI_UNKNOWN; | |
349 | } | |
350 | ||
386c036b MK |
351 | \f |
352 | /* Provide a prototype to silence -Wmissing-prototypes. */ | |
353 | void _initialize_sparcnbsd_tdep (void); | |
354 | ||
9ce5c36a JT |
355 | void |
356 | _initialize_sparnbsd_tdep (void) | |
357 | { | |
358 | gdbarch_register_osabi_sniffer (bfd_arch_sparc, bfd_target_aout_flavour, | |
359 | sparcnbsd_aout_osabi_sniffer); | |
360 | ||
adf93a2f MK |
361 | /* BFD doesn't set a flavour for NetBSD style a.out core files. */ |
362 | gdbarch_register_osabi_sniffer (bfd_arch_sparc, bfd_target_unknown_flavour, | |
89aac506 MK |
363 | sparcnbsd_core_osabi_sniffer); |
364 | ||
05816f70 | 365 | gdbarch_register_osabi (bfd_arch_sparc, 0, GDB_OSABI_NETBSD_AOUT, |
386c036b | 366 | sparc32nbsd_aout_init_abi); |
05816f70 | 367 | gdbarch_register_osabi (bfd_arch_sparc, 0, GDB_OSABI_NETBSD_ELF, |
386c036b | 368 | sparc32nbsd_elf_init_abi); |
9ce5c36a | 369 | } |