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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 | |
10 | the Free Software Foundation; either version 2 of the License, or | |
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 | |
19 | along with this program; if not, write to the Free Software | |
197e01b6 EZ |
20 | Foundation, Inc., 51 Franklin Street, Fifth Floor, |
21 | Boston, MA 02110-1301, USA. */ | |
9ce5c36a JT |
22 | |
23 | #include "defs.h" | |
386c036b MK |
24 | #include "floatformat.h" |
25 | #include "frame.h" | |
26 | #include "frame-unwind.h" | |
9ce5c36a | 27 | #include "gdbcore.h" |
9ce5c36a | 28 | #include "osabi.h" |
386c036b | 29 | #include "regcache.h" |
4e7b0cd3 | 30 | #include "regset.h" |
386c036b MK |
31 | #include "solib-svr4.h" |
32 | #include "symtab.h" | |
33 | #include "trad-frame.h" | |
9ce5c36a | 34 | |
386c036b | 35 | #include "gdb_assert.h" |
f6ad61e3 MK |
36 | #include "gdb_string.h" |
37 | ||
c139e7d9 | 38 | #include "sparc-tdep.h" |
9ce5c36a JT |
39 | #include "nbsd-tdep.h" |
40 | ||
c893be75 MK |
41 | /* Macros to extract fields from SPARC instructions. */ |
42 | #define X_RS1(i) (((i) >> 14) & 0x1f) | |
43 | #define X_RS2(i) ((i) & 0x1f) | |
44 | #define X_I(i) (((i) >> 13) & 1) | |
45 | ||
386c036b | 46 | const struct sparc_gregset sparc32nbsd_gregset = |
9ce5c36a | 47 | { |
386c036b MK |
48 | 0 * 4, /* %psr */ |
49 | 1 * 4, /* %pc */ | |
50 | 2 * 4, /* %npc */ | |
51 | 3 * 4, /* %y */ | |
52 | -1, /* %wim */ | |
53 | -1, /* %tbr */ | |
54 | 5 * 4, /* %g1 */ | |
55 | -1 /* %l0 */ | |
56 | }; | |
9ce5c36a | 57 | |
9ce5c36a | 58 | static void |
4e7b0cd3 MK |
59 | sparc32nbsd_supply_gregset (const struct regset *regset, |
60 | struct regcache *regcache, | |
61 | int regnum, const void *gregs, size_t len) | |
9ce5c36a | 62 | { |
9ea75c57 | 63 | sparc32_supply_gregset (&sparc32nbsd_gregset, regcache, regnum, gregs); |
c8e737d5 MK |
64 | |
65 | /* Traditional NetBSD core files don't use multiple register sets. | |
66 | Instead, the general-purpose and floating-point registers are | |
67 | lumped together in a single section. */ | |
68 | if (len >= 212) | |
69 | sparc32_supply_fpregset (regcache, regnum, (const char *) gregs + 80); | |
9ce5c36a JT |
70 | } |
71 | ||
4e7b0cd3 MK |
72 | static void |
73 | sparc32nbsd_supply_fpregset (const struct regset *regset, | |
74 | struct regcache *regcache, | |
75 | int regnum, const void *fpregs, size_t len) | |
9ce5c36a | 76 | { |
4e7b0cd3 MK |
77 | sparc32_supply_fpregset (regcache, regnum, fpregs); |
78 | } | |
9ce5c36a | 79 | |
386c036b MK |
80 | \f |
81 | /* Signal trampolines. */ | |
82 | ||
83 | /* The following variables describe the location of an on-stack signal | |
84 | trampoline. The current values correspond to the memory layout for | |
85 | NetBSD 1.3 and up. These shouldn't be necessary for NetBSD 2.0 and | |
86 | up, since NetBSD uses signal trampolines provided by libc now. */ | |
9ce5c36a | 87 | |
386c036b MK |
88 | static const CORE_ADDR sparc32nbsd_sigtramp_start = 0xeffffef0; |
89 | static const CORE_ADDR sparc32nbsd_sigtramp_end = 0xeffffff0; | |
9ce5c36a JT |
90 | |
91 | static int | |
386c036b MK |
92 | sparc32nbsd_pc_in_sigtramp (CORE_ADDR pc, char *name) |
93 | { | |
94 | if (pc >= sparc32nbsd_sigtramp_start && pc < sparc32nbsd_sigtramp_end) | |
95 | return 1; | |
96 | ||
97 | return nbsd_pc_in_sigtramp (pc, name); | |
98 | } | |
99 | ||
566626fa MK |
100 | struct trad_frame_saved_reg * |
101 | sparc32nbsd_sigcontext_saved_regs (struct frame_info *next_frame) | |
9ce5c36a | 102 | { |
566626fa | 103 | struct trad_frame_saved_reg *saved_regs; |
386c036b | 104 | CORE_ADDR addr, sigcontext_addr; |
386c036b | 105 | int regnum, delta; |
566626fa | 106 | ULONGEST psr; |
9ce5c36a | 107 | |
566626fa | 108 | saved_regs = trad_frame_alloc_saved_regs (next_frame); |
9ce5c36a | 109 | |
566626fa MK |
110 | /* We find the appropriate instance of `struct sigcontext' at a |
111 | fixed offset in the signal frame. */ | |
112 | addr = frame_unwind_register_unsigned (next_frame, SPARC_FP_REGNUM); | |
113 | sigcontext_addr = addr + 64 + 16; | |
9ce5c36a | 114 | |
386c036b MK |
115 | /* The registers are saved in bits and pieces scattered all over the |
116 | place. The code below records their location on the assumption | |
117 | that the part of the signal trampoline that saves the state has | |
118 | been executed. */ | |
9ce5c36a | 119 | |
566626fa MK |
120 | saved_regs[SPARC_SP_REGNUM].addr = sigcontext_addr + 8; |
121 | saved_regs[SPARC32_PC_REGNUM].addr = sigcontext_addr + 12; | |
122 | saved_regs[SPARC32_NPC_REGNUM].addr = sigcontext_addr + 16; | |
123 | saved_regs[SPARC32_PSR_REGNUM].addr = sigcontext_addr + 20; | |
124 | saved_regs[SPARC_G1_REGNUM].addr = sigcontext_addr + 24; | |
125 | saved_regs[SPARC_O0_REGNUM].addr = sigcontext_addr + 28; | |
386c036b MK |
126 | |
127 | /* The remaining `global' registers and %y are saved in the `local' | |
128 | registers. */ | |
129 | delta = SPARC_L0_REGNUM - SPARC_G0_REGNUM; | |
130 | for (regnum = SPARC_G2_REGNUM; regnum <= SPARC_G7_REGNUM; regnum++) | |
566626fa MK |
131 | saved_regs[regnum].realreg = regnum + delta; |
132 | saved_regs[SPARC32_Y_REGNUM].realreg = SPARC_L1_REGNUM; | |
386c036b MK |
133 | |
134 | /* The remaining `out' registers can be found in the current frame's | |
135 | `in' registers. */ | |
136 | delta = SPARC_I0_REGNUM - SPARC_O0_REGNUM; | |
137 | for (regnum = SPARC_O1_REGNUM; regnum <= SPARC_O5_REGNUM; regnum++) | |
566626fa MK |
138 | saved_regs[regnum].realreg = regnum + delta; |
139 | saved_regs[SPARC_O7_REGNUM].realreg = SPARC_I7_REGNUM; | |
386c036b MK |
140 | |
141 | /* The `local' and `in' registers have been saved in the register | |
142 | save area. */ | |
566626fa | 143 | addr = saved_regs[SPARC_SP_REGNUM].addr; |
386c036b MK |
144 | addr = get_frame_memory_unsigned (next_frame, addr, 4); |
145 | for (regnum = SPARC_L0_REGNUM; | |
146 | regnum <= SPARC_I7_REGNUM; regnum++, addr += 4) | |
566626fa | 147 | saved_regs[regnum].addr = addr; |
386c036b | 148 | |
1c800673 MK |
149 | /* Handle StackGhost. */ |
150 | { | |
151 | ULONGEST wcookie = sparc_fetch_wcookie (); | |
152 | ||
153 | if (wcookie != 0) | |
154 | { | |
155 | ULONGEST i7; | |
156 | ||
157 | addr = saved_regs[SPARC_I7_REGNUM].addr; | |
158 | i7 = get_frame_memory_unsigned (next_frame, addr, 4); | |
159 | trad_frame_set_value (saved_regs, SPARC_I7_REGNUM, i7 ^ wcookie); | |
160 | } | |
161 | } | |
162 | ||
386c036b MK |
163 | /* The floating-point registers are only saved if the EF bit in %prs |
164 | has been set. */ | |
165 | ||
166 | #define PSR_EF 0x00001000 | |
167 | ||
566626fa | 168 | addr = saved_regs[SPARC32_PSR_REGNUM].addr; |
386c036b MK |
169 | psr = get_frame_memory_unsigned (next_frame, addr, 4); |
170 | if (psr & PSR_EF) | |
171 | { | |
172 | CORE_ADDR sp; | |
173 | ||
174 | sp = frame_unwind_register_unsigned (next_frame, SPARC_SP_REGNUM); | |
566626fa | 175 | saved_regs[SPARC32_FSR_REGNUM].addr = sp + 96; |
386c036b MK |
176 | for (regnum = SPARC_F0_REGNUM, addr = sp + 96 + 8; |
177 | regnum <= SPARC_F31_REGNUM; regnum++, addr += 4) | |
566626fa MK |
178 | saved_regs[regnum].addr = addr; |
179 | } | |
180 | ||
181 | return saved_regs; | |
182 | } | |
183 | ||
184 | static struct sparc_frame_cache * | |
185 | sparc32nbsd_sigcontext_frame_cache (struct frame_info *next_frame, | |
186 | void **this_cache) | |
187 | { | |
188 | struct sparc_frame_cache *cache; | |
189 | CORE_ADDR addr; | |
190 | ||
191 | if (*this_cache) | |
192 | return *this_cache; | |
193 | ||
194 | cache = sparc_frame_cache (next_frame, this_cache); | |
195 | gdb_assert (cache == *this_cache); | |
196 | ||
197 | /* If we couldn't find the frame's function, we're probably dealing | |
198 | with an on-stack signal trampoline. */ | |
199 | if (cache->pc == 0) | |
200 | { | |
201 | cache->pc = sparc32nbsd_sigtramp_start; | |
202 | ||
203 | /* Since we couldn't find the frame's function, the cache was | |
204 | initialized under the assumption that we're frameless. */ | |
205 | cache->frameless_p = 0; | |
206 | addr = frame_unwind_register_unsigned (next_frame, SPARC_FP_REGNUM); | |
207 | cache->base = addr; | |
386c036b MK |
208 | } |
209 | ||
566626fa MK |
210 | cache->saved_regs = sparc32nbsd_sigcontext_saved_regs (next_frame); |
211 | ||
386c036b | 212 | return cache; |
9ce5c36a JT |
213 | } |
214 | ||
386c036b MK |
215 | static void |
216 | sparc32nbsd_sigcontext_frame_this_id (struct frame_info *next_frame, | |
217 | void **this_cache, | |
218 | struct frame_id *this_id) | |
219 | { | |
220 | struct sparc_frame_cache *cache = | |
221 | sparc32nbsd_sigcontext_frame_cache (next_frame, this_cache); | |
222 | ||
223 | (*this_id) = frame_id_build (cache->base, cache->pc); | |
224 | } | |
225 | ||
226 | static void | |
227 | sparc32nbsd_sigcontext_frame_prev_register (struct frame_info *next_frame, | |
228 | void **this_cache, | |
229 | int regnum, int *optimizedp, | |
230 | enum lval_type *lvalp, | |
231 | CORE_ADDR *addrp, | |
47ef841b | 232 | int *realnump, gdb_byte *valuep) |
9ce5c36a | 233 | { |
386c036b MK |
234 | struct sparc_frame_cache *cache = |
235 | sparc32nbsd_sigcontext_frame_cache (next_frame, this_cache); | |
9ce5c36a | 236 | |
1f67027d AC |
237 | trad_frame_get_prev_register (next_frame, cache->saved_regs, regnum, |
238 | optimizedp, lvalp, addrp, realnump, valuep); | |
386c036b | 239 | } |
9ce5c36a | 240 | |
386c036b MK |
241 | static const struct frame_unwind sparc32nbsd_sigcontext_frame_unwind = |
242 | { | |
243 | SIGTRAMP_FRAME, | |
244 | sparc32nbsd_sigcontext_frame_this_id, | |
245 | sparc32nbsd_sigcontext_frame_prev_register | |
246 | }; | |
9ce5c36a | 247 | |
386c036b MK |
248 | static const struct frame_unwind * |
249 | sparc32nbsd_sigtramp_frame_sniffer (struct frame_info *next_frame) | |
250 | { | |
251 | CORE_ADDR pc = frame_pc_unwind (next_frame); | |
252 | char *name; | |
9ce5c36a | 253 | |
386c036b MK |
254 | find_pc_partial_function (pc, &name, NULL, NULL); |
255 | if (sparc32nbsd_pc_in_sigtramp (pc, name)) | |
256 | { | |
257 | if (name == NULL || strncmp (name, "__sigtramp_sigcontext", 21)) | |
258 | return &sparc32nbsd_sigcontext_frame_unwind; | |
259 | } | |
260 | ||
261 | return NULL; | |
9ce5c36a | 262 | } |
386c036b | 263 | \f |
c893be75 MK |
264 | /* Return the address of a system call's alternative return |
265 | address. */ | |
266 | ||
267 | CORE_ADDR | |
268 | sparcnbsd_step_trap (unsigned long insn) | |
269 | { | |
270 | if ((X_I (insn) == 0 && X_RS1 (insn) == 0 && X_RS2 (insn) == 0) | |
271 | || (X_I (insn) == 1 && X_RS1 (insn) == 0 && (insn & 0x7f) == 0)) | |
272 | { | |
273 | /* "New" system call. */ | |
274 | ULONGEST number; | |
275 | ||
276 | regcache_cooked_read_unsigned (current_regcache, | |
277 | SPARC_G1_REGNUM, &number); | |
278 | ||
279 | if (number & 0x400) | |
280 | return sparc_address_from_register (SPARC_G2_REGNUM); | |
281 | if (number & 0x800) | |
282 | return sparc_address_from_register (SPARC_G7_REGNUM); | |
283 | } | |
284 | ||
285 | return 0; | |
286 | } | |
287 | \f | |
386c036b | 288 | |
9ce5c36a | 289 | static void |
386c036b | 290 | sparc32nbsd_init_abi (struct gdbarch_info info, struct gdbarch *gdbarch) |
9ce5c36a | 291 | { |
4e7b0cd3 MK |
292 | struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch); |
293 | ||
386c036b MK |
294 | /* NetBSD doesn't support the 128-bit `long double' from the psABI. */ |
295 | set_gdbarch_long_double_bit (gdbarch, 64); | |
296 | set_gdbarch_long_double_format (gdbarch, &floatformat_ieee_double_big); | |
297 | ||
9ea75c57 | 298 | tdep->gregset = regset_alloc (gdbarch, sparc32nbsd_supply_gregset, NULL); |
c8e737d5 | 299 | tdep->sizeof_gregset = 20 * 4; |
4e7b0cd3 | 300 | |
9ea75c57 | 301 | tdep->fpregset = regset_alloc (gdbarch, sparc32nbsd_supply_fpregset, NULL); |
c8e737d5 | 302 | tdep->sizeof_fpregset = 33 * 4; |
4e7b0cd3 | 303 | |
c893be75 MK |
304 | /* Make sure we can single-step "new" syscalls. */ |
305 | tdep->step_trap = sparcnbsd_step_trap; | |
306 | ||
386c036b | 307 | frame_unwind_append_sniffer (gdbarch, sparc32nbsd_sigtramp_frame_sniffer); |
9ce5c36a JT |
308 | } |
309 | ||
310 | static void | |
386c036b | 311 | sparc32nbsd_aout_init_abi (struct gdbarch_info info, struct gdbarch *gdbarch) |
9ce5c36a | 312 | { |
386c036b | 313 | sparc32nbsd_init_abi (info, gdbarch); |
9ce5c36a JT |
314 | } |
315 | ||
19671c2b | 316 | void |
386c036b | 317 | sparc32nbsd_elf_init_abi (struct gdbarch_info info, struct gdbarch *gdbarch) |
9ce5c36a | 318 | { |
386c036b | 319 | sparc32nbsd_init_abi (info, gdbarch); |
9ce5c36a | 320 | |
386c036b | 321 | set_solib_svr4_fetch_link_map_offsets |
be24b061 | 322 | (gdbarch, svr4_ilp32_fetch_link_map_offsets); |
9ce5c36a JT |
323 | } |
324 | ||
325 | static enum gdb_osabi | |
326 | sparcnbsd_aout_osabi_sniffer (bfd *abfd) | |
327 | { | |
328 | if (strcmp (bfd_get_target (abfd), "a.out-sparc-netbsd") == 0) | |
329 | return GDB_OSABI_NETBSD_AOUT; | |
330 | ||
331 | return GDB_OSABI_UNKNOWN; | |
332 | } | |
333 | ||
7e5e9f88 MK |
334 | /* OpenBSD uses the traditional NetBSD core file format, even for |
335 | ports that use ELF. Therefore, if the default OS ABI is OpenBSD | |
336 | ELF, we return that instead of NetBSD a.out. This is mainly for | |
337 | the benfit of OpenBSD/sparc64, which inherits the sniffer below | |
338 | since we include this file for an OpenBSD/sparc64 target. For | |
339 | OpenBSD/sparc, the NetBSD a.out OS ABI is probably similar enough | |
340 | to both the OpenBSD a.out and the OpenBSD ELF OS ABI. */ | |
341 | #if defined (GDB_OSABI_DEFAULT) && (GDB_OSABI_DEFAULT == GDB_OSABI_OPENBSD_ELF) | |
342 | #define GDB_OSABI_NETBSD_CORE GDB_OSABI_OPENBSD_ELF | |
343 | #else | |
344 | #define GDB_OSABI_NETBSD_CORE GDB_OSABI_NETBSD_AOUT | |
345 | #endif | |
346 | ||
89aac506 MK |
347 | static enum gdb_osabi |
348 | sparcnbsd_core_osabi_sniffer (bfd *abfd) | |
349 | { | |
350 | if (strcmp (bfd_get_target (abfd), "netbsd-core") == 0) | |
7e5e9f88 | 351 | return GDB_OSABI_NETBSD_CORE; |
89aac506 MK |
352 | |
353 | return GDB_OSABI_UNKNOWN; | |
354 | } | |
355 | ||
386c036b MK |
356 | \f |
357 | /* Provide a prototype to silence -Wmissing-prototypes. */ | |
358 | void _initialize_sparcnbsd_tdep (void); | |
359 | ||
9ce5c36a JT |
360 | void |
361 | _initialize_sparnbsd_tdep (void) | |
362 | { | |
363 | gdbarch_register_osabi_sniffer (bfd_arch_sparc, bfd_target_aout_flavour, | |
364 | sparcnbsd_aout_osabi_sniffer); | |
365 | ||
adf93a2f MK |
366 | /* BFD doesn't set a flavour for NetBSD style a.out core files. */ |
367 | gdbarch_register_osabi_sniffer (bfd_arch_sparc, bfd_target_unknown_flavour, | |
89aac506 MK |
368 | sparcnbsd_core_osabi_sniffer); |
369 | ||
05816f70 | 370 | gdbarch_register_osabi (bfd_arch_sparc, 0, GDB_OSABI_NETBSD_AOUT, |
386c036b | 371 | sparc32nbsd_aout_init_abi); |
05816f70 | 372 | gdbarch_register_osabi (bfd_arch_sparc, 0, GDB_OSABI_NETBSD_ELF, |
386c036b | 373 | sparc32nbsd_elf_init_abi); |
9ce5c36a | 374 | } |