1 /* Target-dependent code for NetBSD/sparc.
2
3 Copyright 2002, 2003, 2004 Free Software Foundation, Inc.
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
20 Foundation, Inc., 59 Temple Place - Suite 330,
21 Boston, MA 02111-1307, USA. */
22
23 #include "defs.h"
24 #include "floatformat.h"
25 #include "frame.h"
26 #include "frame-unwind.h"
27 #include "gdbcore.h"
28 #include "osabi.h"
29 #include "regcache.h"
30 #include "regset.h"
31 #include "solib-svr4.h"
32 #include "symtab.h"
33 #include "trad-frame.h"
34
35 #include "gdb_assert.h"
36 #include "gdb_string.h"
37
38 #include "sparc-tdep.h"
39 #include "nbsd-tdep.h"
40
41 const struct sparc_gregset sparc32nbsd_gregset =
42 {
43 0 * 4, /* %psr */
44 1 * 4, /* %pc */
45 2 * 4, /* %npc */
46 3 * 4, /* %y */
47 -1, /* %wim */
48 -1, /* %tbr */
49 5 * 4, /* %g1 */
50 -1 /* %l0 */
51 };
52
53 static void
sparc32nbsd_supply_gregset(const struct regset * regset,struct regcache * regcache,int regnum,const void * gregs,size_t len)54 sparc32nbsd_supply_gregset (const struct regset *regset,
55 struct regcache *regcache,
56 int regnum, const void *gregs, size_t len)
57 {
58 sparc32_supply_gregset (&sparc32nbsd_gregset, regcache, regnum, gregs);
59
60 /* Traditional NetBSD core files don't use multiple register sets.
61 Instead, the general-purpose and floating-point registers are
62 lumped together in a single section. */
63 if (len >= 212)
64 sparc32_supply_fpregset (regcache, regnum, (const char *) gregs + 80);
65 }
66
67 static void
sparc32nbsd_supply_fpregset(const struct regset * regset,struct regcache * regcache,int regnum,const void * fpregs,size_t len)68 sparc32nbsd_supply_fpregset (const struct regset *regset,
69 struct regcache *regcache,
70 int regnum, const void *fpregs, size_t len)
71 {
72 sparc32_supply_fpregset (regcache, regnum, fpregs);
73 }
74
75
76 /* Signal trampolines. */
77
78 /* The following variables describe the location of an on-stack signal
79 trampoline. The current values correspond to the memory layout for
80 NetBSD 1.3 and up. These shouldn't be necessary for NetBSD 2.0 and
81 up, since NetBSD uses signal trampolines provided by libc now. */
82
83 static const CORE_ADDR sparc32nbsd_sigtramp_start = 0xeffffef0;
84 static const CORE_ADDR sparc32nbsd_sigtramp_end = 0xeffffff0;
85
86 static int
sparc32nbsd_pc_in_sigtramp(CORE_ADDR pc,char * name)87 sparc32nbsd_pc_in_sigtramp (CORE_ADDR pc, char *name)
88 {
89 if (pc >= sparc32nbsd_sigtramp_start && pc < sparc32nbsd_sigtramp_end)
90 return 1;
91
92 return nbsd_pc_in_sigtramp (pc, name);
93 }
94
95 struct trad_frame_saved_reg *
sparc32nbsd_sigcontext_saved_regs(struct frame_info * next_frame)96 sparc32nbsd_sigcontext_saved_regs (struct frame_info *next_frame)
97 {
98 struct trad_frame_saved_reg *saved_regs;
99 CORE_ADDR addr, sigcontext_addr;
100 int regnum, delta;
101 ULONGEST psr;
102
103 saved_regs = trad_frame_alloc_saved_regs (next_frame);
104
105 /* We find the appropriate instance of `struct sigcontext' at a
106 fixed offset in the signal frame. */
107 addr = frame_unwind_register_unsigned (next_frame, SPARC_FP_REGNUM);
108 sigcontext_addr = addr + 64 + 16;
109
110 /* The registers are saved in bits and pieces scattered all over the
111 place. The code below records their location on the assumption
112 that the part of the signal trampoline that saves the state has
113 been executed. */
114
115 saved_regs[SPARC_SP_REGNUM].addr = sigcontext_addr + 8;
116 saved_regs[SPARC32_PC_REGNUM].addr = sigcontext_addr + 12;
117 saved_regs[SPARC32_NPC_REGNUM].addr = sigcontext_addr + 16;
118 saved_regs[SPARC32_PSR_REGNUM].addr = sigcontext_addr + 20;
119 saved_regs[SPARC_G1_REGNUM].addr = sigcontext_addr + 24;
120 saved_regs[SPARC_O0_REGNUM].addr = sigcontext_addr + 28;
121
122 /* The remaining `global' registers and %y are saved in the `local'
123 registers. */
124 delta = SPARC_L0_REGNUM - SPARC_G0_REGNUM;
125 for (regnum = SPARC_G2_REGNUM; regnum <= SPARC_G7_REGNUM; regnum++)
126 saved_regs[regnum].realreg = regnum + delta;
127 saved_regs[SPARC32_Y_REGNUM].realreg = SPARC_L1_REGNUM;
128
129 /* The remaining `out' registers can be found in the current frame's
130 `in' registers. */
131 delta = SPARC_I0_REGNUM - SPARC_O0_REGNUM;
132 for (regnum = SPARC_O1_REGNUM; regnum <= SPARC_O5_REGNUM; regnum++)
133 saved_regs[regnum].realreg = regnum + delta;
134 saved_regs[SPARC_O7_REGNUM].realreg = SPARC_I7_REGNUM;
135
136 /* The `local' and `in' registers have been saved in the register
137 save area. */
138 addr = saved_regs[SPARC_SP_REGNUM].addr;
139 addr = get_frame_memory_unsigned (next_frame, addr, 4);
140 for (regnum = SPARC_L0_REGNUM;
141 regnum <= SPARC_I7_REGNUM; regnum++, addr += 4)
142 saved_regs[regnum].addr = addr;
143
144 /* Handle StackGhost. */
145 {
146 ULONGEST wcookie = sparc_fetch_wcookie ();
147
148 if (wcookie != 0)
149 {
150 ULONGEST i7;
151
152 addr = saved_regs[SPARC_I7_REGNUM].addr;
153 i7 = get_frame_memory_unsigned (next_frame, addr, 4);
154 trad_frame_set_value (saved_regs, SPARC_I7_REGNUM, i7 ^ wcookie);
155 }
156 }
157
158 /* The floating-point registers are only saved if the EF bit in %prs
159 has been set. */
160
161 #define PSR_EF 0x00001000
162
163 addr = saved_regs[SPARC32_PSR_REGNUM].addr;
164 psr = get_frame_memory_unsigned (next_frame, addr, 4);
165 if (psr & PSR_EF)
166 {
167 CORE_ADDR sp;
168
169 sp = frame_unwind_register_unsigned (next_frame, SPARC_SP_REGNUM);
170 saved_regs[SPARC32_FSR_REGNUM].addr = sp + 96;
171 for (regnum = SPARC_F0_REGNUM, addr = sp + 96 + 8;
172 regnum <= SPARC_F31_REGNUM; regnum++, addr += 4)
173 saved_regs[regnum].addr = addr;
174 }
175
176 return saved_regs;
177 }
178
179 static struct sparc_frame_cache *
sparc32nbsd_sigcontext_frame_cache(struct frame_info * next_frame,void ** this_cache)180 sparc32nbsd_sigcontext_frame_cache (struct frame_info *next_frame,
181 void **this_cache)
182 {
183 struct sparc_frame_cache *cache;
184 CORE_ADDR addr;
185
186 if (*this_cache)
187 return *this_cache;
188
189 cache = sparc_frame_cache (next_frame, this_cache);
190 gdb_assert (cache == *this_cache);
191
192 /* If we couldn't find the frame's function, we're probably dealing
193 with an on-stack signal trampoline. */
194 if (cache->pc == 0)
195 {
196 cache->pc = sparc32nbsd_sigtramp_start;
197
198 /* Since we couldn't find the frame's function, the cache was
199 initialized under the assumption that we're frameless. */
200 cache->frameless_p = 0;
201 addr = frame_unwind_register_unsigned (next_frame, SPARC_FP_REGNUM);
202 cache->base = addr;
203 }
204
205 cache->saved_regs = sparc32nbsd_sigcontext_saved_regs (next_frame);
206
207 return cache;
208 }
209
210 static void
sparc32nbsd_sigcontext_frame_this_id(struct frame_info * next_frame,void ** this_cache,struct frame_id * this_id)211 sparc32nbsd_sigcontext_frame_this_id (struct frame_info *next_frame,
212 void **this_cache,
213 struct frame_id *this_id)
214 {
215 struct sparc_frame_cache *cache =
216 sparc32nbsd_sigcontext_frame_cache (next_frame, this_cache);
217
218 (*this_id) = frame_id_build (cache->base, cache->pc);
219 }
220
221 static void
sparc32nbsd_sigcontext_frame_prev_register(struct frame_info * next_frame,void ** this_cache,int regnum,int * optimizedp,enum lval_type * lvalp,CORE_ADDR * addrp,int * realnump,void * valuep)222 sparc32nbsd_sigcontext_frame_prev_register (struct frame_info *next_frame,
223 void **this_cache,
224 int regnum, int *optimizedp,
225 enum lval_type *lvalp,
226 CORE_ADDR *addrp,
227 int *realnump, void *valuep)
228 {
229 struct sparc_frame_cache *cache =
230 sparc32nbsd_sigcontext_frame_cache (next_frame, this_cache);
231
232 trad_frame_get_prev_register (next_frame, cache->saved_regs, regnum,
233 optimizedp, lvalp, addrp, realnump, valuep);
234 }
235
236 static const struct frame_unwind sparc32nbsd_sigcontext_frame_unwind =
237 {
238 SIGTRAMP_FRAME,
239 sparc32nbsd_sigcontext_frame_this_id,
240 sparc32nbsd_sigcontext_frame_prev_register
241 };
242
243 static const struct frame_unwind *
sparc32nbsd_sigtramp_frame_sniffer(struct frame_info * next_frame)244 sparc32nbsd_sigtramp_frame_sniffer (struct frame_info *next_frame)
245 {
246 CORE_ADDR pc = frame_pc_unwind (next_frame);
247 char *name;
248
249 find_pc_partial_function (pc, &name, NULL, NULL);
250 if (sparc32nbsd_pc_in_sigtramp (pc, name))
251 {
252 if (name == NULL || strncmp (name, "__sigtramp_sigcontext", 21))
253 return &sparc32nbsd_sigcontext_frame_unwind;
254 }
255
256 return NULL;
257 }
258
259
260 /* Return non-zero if we are in a shared library trampoline code stub. */
261
262 static int
sparcnbsd_aout_in_solib_call_trampoline(CORE_ADDR pc,char * name)263 sparcnbsd_aout_in_solib_call_trampoline (CORE_ADDR pc, char *name)
264 {
265 return (name && !strcmp (name, "_DYNAMIC"));
266 }
267
268 static void
sparc32nbsd_init_abi(struct gdbarch_info info,struct gdbarch * gdbarch)269 sparc32nbsd_init_abi (struct gdbarch_info info, struct gdbarch *gdbarch)
270 {
271 struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch);
272
273 /* NetBSD doesn't support the 128-bit `long double' from the psABI. */
274 set_gdbarch_long_double_bit (gdbarch, 64);
275 set_gdbarch_long_double_format (gdbarch, &floatformat_ieee_double_big);
276
277 tdep->gregset = regset_alloc (gdbarch, sparc32nbsd_supply_gregset, NULL);
278 tdep->sizeof_gregset = 20 * 4;
279
280 tdep->fpregset = regset_alloc (gdbarch, sparc32nbsd_supply_fpregset, NULL);
281 tdep->sizeof_fpregset = 33 * 4;
282
283 frame_unwind_append_sniffer (gdbarch, sparc32nbsd_sigtramp_frame_sniffer);
284 }
285
286 static void
sparc32nbsd_aout_init_abi(struct gdbarch_info info,struct gdbarch * gdbarch)287 sparc32nbsd_aout_init_abi (struct gdbarch_info info, struct gdbarch *gdbarch)
288 {
289 sparc32nbsd_init_abi (info, gdbarch);
290
291 set_gdbarch_in_solib_call_trampoline
292 (gdbarch, sparcnbsd_aout_in_solib_call_trampoline);
293 }
294
295 void
sparc32nbsd_elf_init_abi(struct gdbarch_info info,struct gdbarch * gdbarch)296 sparc32nbsd_elf_init_abi (struct gdbarch_info info, struct gdbarch *gdbarch)
297 {
298 sparc32nbsd_init_abi (info, gdbarch);
299
300 set_solib_svr4_fetch_link_map_offsets
301 (gdbarch, svr4_ilp32_fetch_link_map_offsets);
302 }
303
304 static enum gdb_osabi
sparcnbsd_aout_osabi_sniffer(bfd * abfd)305 sparcnbsd_aout_osabi_sniffer (bfd *abfd)
306 {
307 if (strcmp (bfd_get_target (abfd), "a.out-sparc-netbsd") == 0)
308 return GDB_OSABI_NETBSD_AOUT;
309
310 return GDB_OSABI_UNKNOWN;
311 }
312
313 /* OpenBSD uses the traditional NetBSD core file format, even for
314 ports that use ELF. Therefore, if the default OS ABI is OpenBSD
315 ELF, we return that instead of NetBSD a.out. This is mainly for
316 the benfit of OpenBSD/sparc64, which inherits the sniffer below
317 since we include this file for an OpenBSD/sparc64 target. For
318 OpenBSD/sparc, the NetBSD a.out OS ABI is probably similar enough
319 to both the OpenBSD a.out and the OpenBSD ELF OS ABI. */
320 #if defined (GDB_OSABI_DEFAULT) && (GDB_OSABI_DEFAULT == GDB_OSABI_OPENBSD_ELF)
321 #define GDB_OSABI_NETBSD_CORE GDB_OSABI_OPENBSD_ELF
322 #else
323 #define GDB_OSABI_NETBSD_CORE GDB_OSABI_NETBSD_AOUT
324 #endif
325
326 static enum gdb_osabi
sparcnbsd_core_osabi_sniffer(bfd * abfd)327 sparcnbsd_core_osabi_sniffer (bfd *abfd)
328 {
329 if (strcmp (bfd_get_target (abfd), "netbsd-core") == 0)
330 return GDB_OSABI_NETBSD_CORE;
331
332 return GDB_OSABI_UNKNOWN;
333 }
334
335
336 /* Provide a prototype to silence -Wmissing-prototypes. */
337 void _initialize_sparcnbsd_tdep (void);
338
339 void
_initialize_sparnbsd_tdep(void)340 _initialize_sparnbsd_tdep (void)
341 {
342 gdbarch_register_osabi_sniffer (bfd_arch_sparc, bfd_target_aout_flavour,
343 sparcnbsd_aout_osabi_sniffer);
344
345 /* BFD doesn't set a flavour for NetBSD style a.out core files. */
346 gdbarch_register_osabi_sniffer (bfd_arch_sparc, bfd_target_unknown_flavour,
347 sparcnbsd_core_osabi_sniffer);
348
349 gdbarch_register_osabi (bfd_arch_sparc, 0, GDB_OSABI_NETBSD_AOUT,
350 sparc32nbsd_aout_init_abi);
351 gdbarch_register_osabi (bfd_arch_sparc, 0, GDB_OSABI_NETBSD_ELF,
352 sparc32nbsd_elf_init_abi);
353 }
354