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386c036b MK |
1 | /* Target-dependent code for NetBSD/sparc. |
2 | ||
3 | Copyright 2002, 2003, 2004 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 | |
20 | Foundation, Inc., 59 Temple Place - Suite 330, | |
21 | Boston, MA 02111-1307, USA. */ | |
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 | ||
386c036b | 41 | const struct sparc_gregset sparc32nbsd_gregset = |
9ce5c36a | 42 | { |
386c036b MK |
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 | }; | |
9ce5c36a | 52 | |
386c036b MK |
53 | /* Unlike other NetBSD implementations, the SPARC port historically |
54 | used .reg and .reg2 (see bfd/netbsd-core.c), and as such, we can | |
55 | share one routine for a.out and ELF core files. */ | |
9ce5c36a | 56 | |
9ce5c36a | 57 | static void |
4e7b0cd3 MK |
58 | sparc32nbsd_supply_gregset (const struct regset *regset, |
59 | struct regcache *regcache, | |
60 | int regnum, const void *gregs, size_t len) | |
9ce5c36a | 61 | { |
4e7b0cd3 | 62 | sparc32_supply_gregset (regset->descr, regcache, regnum, gregs); |
9ce5c36a JT |
63 | } |
64 | ||
4e7b0cd3 MK |
65 | static void |
66 | sparc32nbsd_supply_fpregset (const struct regset *regset, | |
67 | struct regcache *regcache, | |
68 | int regnum, const void *fpregs, size_t len) | |
9ce5c36a | 69 | { |
4e7b0cd3 MK |
70 | sparc32_supply_fpregset (regcache, regnum, fpregs); |
71 | } | |
9ce5c36a | 72 | |
386c036b MK |
73 | \f |
74 | /* Signal trampolines. */ | |
75 | ||
76 | /* The following variables describe the location of an on-stack signal | |
77 | trampoline. The current values correspond to the memory layout for | |
78 | NetBSD 1.3 and up. These shouldn't be necessary for NetBSD 2.0 and | |
79 | up, since NetBSD uses signal trampolines provided by libc now. */ | |
9ce5c36a | 80 | |
386c036b MK |
81 | static const CORE_ADDR sparc32nbsd_sigtramp_start = 0xeffffef0; |
82 | static const CORE_ADDR sparc32nbsd_sigtramp_end = 0xeffffff0; | |
9ce5c36a JT |
83 | |
84 | static int | |
386c036b MK |
85 | sparc32nbsd_pc_in_sigtramp (CORE_ADDR pc, char *name) |
86 | { | |
87 | if (pc >= sparc32nbsd_sigtramp_start && pc < sparc32nbsd_sigtramp_end) | |
88 | return 1; | |
89 | ||
90 | return nbsd_pc_in_sigtramp (pc, name); | |
91 | } | |
92 | ||
93 | static struct sparc_frame_cache * | |
94 | sparc32nbsd_sigcontext_frame_cache (struct frame_info *next_frame, | |
95 | void **this_cache) | |
9ce5c36a | 96 | { |
386c036b MK |
97 | struct sparc_frame_cache *cache; |
98 | CORE_ADDR addr, sigcontext_addr; | |
99 | LONGEST psr; | |
100 | int regnum, delta; | |
9ce5c36a | 101 | |
386c036b MK |
102 | if (*this_cache) |
103 | return *this_cache; | |
9ce5c36a | 104 | |
386c036b MK |
105 | cache = sparc_frame_cache (next_frame, this_cache); |
106 | gdb_assert (cache == *this_cache); | |
9ce5c36a | 107 | |
386c036b MK |
108 | /* The registers are saved in bits and pieces scattered all over the |
109 | place. The code below records their location on the assumption | |
110 | that the part of the signal trampoline that saves the state has | |
111 | been executed. */ | |
9ce5c36a | 112 | |
386c036b MK |
113 | /* If we couldn't find the frame's function, we're probably dealing |
114 | with an on-stack signal trampoline. */ | |
115 | if (cache->pc == 0) | |
116 | { | |
117 | cache->pc = sparc32nbsd_sigtramp_start; | |
118 | ||
119 | /* Since we couldn't find the frame's function, the cache was | |
120 | initialized under the assumption that we're frameless. */ | |
121 | cache->frameless_p = 0; | |
122 | addr = frame_unwind_register_unsigned (next_frame, SPARC_FP_REGNUM); | |
123 | cache->base = addr; | |
124 | } | |
125 | ||
126 | cache->saved_regs = trad_frame_alloc_saved_regs (next_frame); | |
127 | ||
128 | /* We find the appropriate instance of `struct sigcontext' at a | |
129 | fixed offset in the signal frame. */ | |
130 | sigcontext_addr = cache->base + 64 + 16; | |
131 | ||
132 | cache->saved_regs[SPARC_SP_REGNUM].addr = sigcontext_addr + 8; | |
133 | cache->saved_regs[SPARC32_PC_REGNUM].addr = sigcontext_addr + 12; | |
134 | cache->saved_regs[SPARC32_NPC_REGNUM].addr = sigcontext_addr + 16; | |
135 | cache->saved_regs[SPARC32_PSR_REGNUM].addr = sigcontext_addr + 20; | |
136 | cache->saved_regs[SPARC_G1_REGNUM].addr = sigcontext_addr + 24; | |
137 | cache->saved_regs[SPARC_O0_REGNUM].addr = sigcontext_addr + 28; | |
138 | ||
139 | /* The remaining `global' registers and %y are saved in the `local' | |
140 | registers. */ | |
141 | delta = SPARC_L0_REGNUM - SPARC_G0_REGNUM; | |
142 | for (regnum = SPARC_G2_REGNUM; regnum <= SPARC_G7_REGNUM; regnum++) | |
143 | cache->saved_regs[regnum].realreg = regnum + delta; | |
144 | cache->saved_regs[SPARC32_Y_REGNUM].realreg = SPARC_L1_REGNUM; | |
145 | ||
146 | /* The remaining `out' registers can be found in the current frame's | |
147 | `in' registers. */ | |
148 | delta = SPARC_I0_REGNUM - SPARC_O0_REGNUM; | |
149 | for (regnum = SPARC_O1_REGNUM; regnum <= SPARC_O5_REGNUM; regnum++) | |
150 | cache->saved_regs[regnum].realreg = regnum + delta; | |
151 | cache->saved_regs[SPARC_O7_REGNUM].realreg = SPARC_I7_REGNUM; | |
152 | ||
153 | /* The `local' and `in' registers have been saved in the register | |
154 | save area. */ | |
155 | addr = cache->saved_regs[SPARC_SP_REGNUM].addr; | |
156 | addr = get_frame_memory_unsigned (next_frame, addr, 4); | |
157 | for (regnum = SPARC_L0_REGNUM; | |
158 | regnum <= SPARC_I7_REGNUM; regnum++, addr += 4) | |
159 | cache->saved_regs[regnum].addr = addr; | |
160 | ||
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 | ||
166 | addr = cache->saved_regs[SPARC32_PSR_REGNUM].addr; | |
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); | |
173 | cache->saved_regs[SPARC32_FSR_REGNUM].addr = sp + 96; | |
174 | for (regnum = SPARC_F0_REGNUM, addr = sp + 96 + 8; | |
175 | regnum <= SPARC_F31_REGNUM; regnum++, addr += 4) | |
176 | cache->saved_regs[regnum].addr = addr; | |
177 | } | |
178 | ||
179 | return cache; | |
9ce5c36a JT |
180 | } |
181 | ||
386c036b MK |
182 | static void |
183 | sparc32nbsd_sigcontext_frame_this_id (struct frame_info *next_frame, | |
184 | void **this_cache, | |
185 | struct frame_id *this_id) | |
186 | { | |
187 | struct sparc_frame_cache *cache = | |
188 | sparc32nbsd_sigcontext_frame_cache (next_frame, this_cache); | |
189 | ||
190 | (*this_id) = frame_id_build (cache->base, cache->pc); | |
191 | } | |
192 | ||
193 | static void | |
194 | sparc32nbsd_sigcontext_frame_prev_register (struct frame_info *next_frame, | |
195 | void **this_cache, | |
196 | int regnum, int *optimizedp, | |
197 | enum lval_type *lvalp, | |
198 | CORE_ADDR *addrp, | |
199 | int *realnump, void *valuep) | |
9ce5c36a | 200 | { |
386c036b MK |
201 | struct sparc_frame_cache *cache = |
202 | sparc32nbsd_sigcontext_frame_cache (next_frame, this_cache); | |
9ce5c36a | 203 | |
386c036b MK |
204 | trad_frame_prev_register (next_frame, cache->saved_regs, regnum, |
205 | optimizedp, lvalp, addrp, realnump, valuep); | |
206 | } | |
9ce5c36a | 207 | |
386c036b MK |
208 | static const struct frame_unwind sparc32nbsd_sigcontext_frame_unwind = |
209 | { | |
210 | SIGTRAMP_FRAME, | |
211 | sparc32nbsd_sigcontext_frame_this_id, | |
212 | sparc32nbsd_sigcontext_frame_prev_register | |
213 | }; | |
9ce5c36a | 214 | |
386c036b MK |
215 | static const struct frame_unwind * |
216 | sparc32nbsd_sigtramp_frame_sniffer (struct frame_info *next_frame) | |
217 | { | |
218 | CORE_ADDR pc = frame_pc_unwind (next_frame); | |
219 | char *name; | |
9ce5c36a | 220 | |
386c036b MK |
221 | find_pc_partial_function (pc, &name, NULL, NULL); |
222 | if (sparc32nbsd_pc_in_sigtramp (pc, name)) | |
223 | { | |
224 | if (name == NULL || strncmp (name, "__sigtramp_sigcontext", 21)) | |
225 | return &sparc32nbsd_sigcontext_frame_unwind; | |
226 | } | |
227 | ||
228 | return NULL; | |
9ce5c36a | 229 | } |
386c036b MK |
230 | \f |
231 | ||
232 | /* Return non-zero if we are in a shared library trampoline code stub. */ | |
9ce5c36a JT |
233 | |
234 | static int | |
235 | sparcnbsd_aout_in_solib_call_trampoline (CORE_ADDR pc, char *name) | |
236 | { | |
386c036b | 237 | return (name && !strcmp (name, "_DYNAMIC")); |
9ce5c36a JT |
238 | } |
239 | ||
240 | static void | |
386c036b | 241 | sparc32nbsd_init_abi (struct gdbarch_info info, struct gdbarch *gdbarch) |
9ce5c36a | 242 | { |
4e7b0cd3 MK |
243 | struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch); |
244 | ||
386c036b MK |
245 | /* NetBSD doesn't support the 128-bit `long double' from the psABI. */ |
246 | set_gdbarch_long_double_bit (gdbarch, 64); | |
247 | set_gdbarch_long_double_format (gdbarch, &floatformat_ieee_double_big); | |
248 | ||
4e7b0cd3 MK |
249 | tdep->gregset = XMALLOC (struct regset); |
250 | tdep->gregset->descr = &sparc32nbsd_gregset; | |
251 | tdep->gregset->supply_regset = sparc32nbsd_supply_gregset; | |
252 | ||
253 | tdep->fpregset = XMALLOC (struct regset); | |
254 | tdep->fpregset->supply_regset = sparc32nbsd_supply_fpregset; | |
255 | ||
386c036b MK |
256 | set_gdbarch_pc_in_sigtramp (gdbarch, sparc32nbsd_pc_in_sigtramp); |
257 | frame_unwind_append_sniffer (gdbarch, sparc32nbsd_sigtramp_frame_sniffer); | |
9ce5c36a JT |
258 | } |
259 | ||
260 | static void | |
386c036b | 261 | sparc32nbsd_aout_init_abi (struct gdbarch_info info, struct gdbarch *gdbarch) |
9ce5c36a | 262 | { |
386c036b | 263 | sparc32nbsd_init_abi (info, gdbarch); |
9ce5c36a | 264 | |
386c036b MK |
265 | set_gdbarch_in_solib_call_trampoline |
266 | (gdbarch, sparcnbsd_aout_in_solib_call_trampoline); | |
9ce5c36a JT |
267 | } |
268 | ||
269 | static void | |
386c036b | 270 | sparc32nbsd_elf_init_abi (struct gdbarch_info info, struct gdbarch *gdbarch) |
9ce5c36a | 271 | { |
386c036b | 272 | sparc32nbsd_init_abi (info, gdbarch); |
9ce5c36a | 273 | |
386c036b MK |
274 | set_solib_svr4_fetch_link_map_offsets |
275 | (gdbarch, nbsd_ilp32_solib_svr4_fetch_link_map_offsets); | |
9ce5c36a JT |
276 | } |
277 | ||
278 | static enum gdb_osabi | |
279 | sparcnbsd_aout_osabi_sniffer (bfd *abfd) | |
280 | { | |
281 | if (strcmp (bfd_get_target (abfd), "a.out-sparc-netbsd") == 0) | |
282 | return GDB_OSABI_NETBSD_AOUT; | |
283 | ||
284 | return GDB_OSABI_UNKNOWN; | |
285 | } | |
286 | ||
386c036b MK |
287 | \f |
288 | /* Provide a prototype to silence -Wmissing-prototypes. */ | |
289 | void _initialize_sparcnbsd_tdep (void); | |
290 | ||
9ce5c36a JT |
291 | void |
292 | _initialize_sparnbsd_tdep (void) | |
293 | { | |
294 | gdbarch_register_osabi_sniffer (bfd_arch_sparc, bfd_target_aout_flavour, | |
295 | sparcnbsd_aout_osabi_sniffer); | |
296 | ||
05816f70 | 297 | gdbarch_register_osabi (bfd_arch_sparc, 0, GDB_OSABI_NETBSD_AOUT, |
386c036b | 298 | sparc32nbsd_aout_init_abi); |
05816f70 | 299 | gdbarch_register_osabi (bfd_arch_sparc, 0, GDB_OSABI_NETBSD_ELF, |
386c036b | 300 | sparc32nbsd_elf_init_abi); |
9ce5c36a | 301 | } |