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386c036b MK |
1 | /* Target-dependent code for NetBSD/sparc64. |
2 | ||
9b254dd1 | 3 | Copyright (C) 2002, 2003, 2004, 2005, 2006, 2007, 2008 |
6aba47ca | 4 | Free Software Foundation, Inc. |
386c036b MK |
5 | Based on code 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 |
386c036b MK |
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/>. */ |
386c036b MK |
21 | |
22 | #include "defs.h" | |
23 | #include "frame.h" | |
24 | #include "frame-unwind.h" | |
25 | #include "gdbcore.h" | |
26 | #include "osabi.h" | |
27 | #include "regcache.h" | |
2ca62865 | 28 | #include "regset.h" |
386c036b | 29 | #include "symtab.h" |
3510d1f2 | 30 | #include "objfiles.h" |
386c036b MK |
31 | #include "solib-svr4.h" |
32 | #include "trad-frame.h" | |
33 | ||
34 | #include "gdb_assert.h" | |
35 | #include "gdb_string.h" | |
36 | ||
37 | #include "sparc64-tdep.h" | |
38 | #include "nbsd-tdep.h" | |
39 | ||
40 | /* From <machine/reg.h>. */ | |
41 | const struct sparc_gregset sparc64nbsd_gregset = | |
42 | { | |
43 | 0 * 8, /* "tstate" */ | |
44 | 1 * 8, /* %pc */ | |
45 | 2 * 8, /* %npc */ | |
46 | 3 * 8, /* %y */ | |
47 | -1, /* %fprs */ | |
48 | -1, | |
49 | 5 * 8, /* %g1 */ | |
50 | -1, /* %l0 */ | |
51 | 4 /* sizeof (%y) */ | |
52 | }; | |
2ca62865 | 53 | \f |
386c036b MK |
54 | |
55 | static void | |
2ca62865 MK |
56 | sparc64nbsd_supply_gregset (const struct regset *regset, |
57 | struct regcache *regcache, | |
58 | int regnum, const void *gregs, size_t len) | |
386c036b | 59 | { |
9ea75c57 | 60 | sparc64_supply_gregset (&sparc64nbsd_gregset, regcache, regnum, gregs); |
386c036b MK |
61 | } |
62 | ||
2ca62865 MK |
63 | static void |
64 | sparc64nbsd_supply_fpregset (const struct regset *regset, | |
65 | struct regcache *regcache, | |
66 | int regnum, const void *fpregs, size_t len) | |
386c036b | 67 | { |
2ca62865 MK |
68 | sparc64_supply_fpregset (regcache, regnum, fpregs); |
69 | } | |
386c036b | 70 | \f |
2ca62865 | 71 | |
386c036b MK |
72 | /* Signal trampolines. */ |
73 | ||
74 | /* The following variables describe the location of an on-stack signal | |
75 | trampoline. The current values correspond to the memory layout for | |
76 | NetBSD 1.3 and up. These shouldn't be necessary for NetBSD 2.0 and | |
77 | up, since NetBSD uses signal trampolines provided by libc now. */ | |
78 | ||
79 | static const CORE_ADDR sparc64nbsd_sigtramp_start = 0xffffffffffffdee4ULL; | |
80 | static const CORE_ADDR sparc64nbsd_sigtramp_end = 0xffffffffffffe000ULL; | |
81 | ||
82 | static int | |
83 | sparc64nbsd_pc_in_sigtramp (CORE_ADDR pc, char *name) | |
84 | { | |
85 | if (pc >= sparc64nbsd_sigtramp_start && pc < sparc64nbsd_sigtramp_end) | |
86 | return 1; | |
87 | ||
88 | return nbsd_pc_in_sigtramp (pc, name); | |
89 | } | |
90 | ||
1e067c66 MK |
91 | struct trad_frame_saved_reg * |
92 | sparc64nbsd_sigcontext_saved_regs (CORE_ADDR sigcontext_addr, | |
94afd7a6 | 93 | struct frame_info *this_frame) |
386c036b | 94 | { |
1e067c66 MK |
95 | struct trad_frame_saved_reg *saved_regs; |
96 | CORE_ADDR addr, sp; | |
386c036b MK |
97 | int regnum, delta; |
98 | ||
94afd7a6 | 99 | saved_regs = trad_frame_alloc_saved_regs (this_frame); |
386c036b MK |
100 | |
101 | /* The registers are saved in bits and pieces scattered all over the | |
102 | place. The code below records their location on the assumption | |
103 | that the part of the signal trampoline that saves the state has | |
104 | been executed. */ | |
105 | ||
1e067c66 MK |
106 | saved_regs[SPARC_SP_REGNUM].addr = sigcontext_addr + 8; |
107 | saved_regs[SPARC64_PC_REGNUM].addr = sigcontext_addr + 16; | |
108 | saved_regs[SPARC64_NPC_REGNUM].addr = sigcontext_addr + 24; | |
109 | saved_regs[SPARC64_STATE_REGNUM].addr = sigcontext_addr + 32; | |
110 | saved_regs[SPARC_G1_REGNUM].addr = sigcontext_addr + 40; | |
111 | saved_regs[SPARC_O0_REGNUM].addr = sigcontext_addr + 48; | |
386c036b MK |
112 | |
113 | /* The remaining `global' registers and %y are saved in the `local' | |
114 | registers. */ | |
115 | delta = SPARC_L0_REGNUM - SPARC_G0_REGNUM; | |
116 | for (regnum = SPARC_G2_REGNUM; regnum <= SPARC_G7_REGNUM; regnum++) | |
1e067c66 MK |
117 | saved_regs[regnum].realreg = regnum + delta; |
118 | saved_regs[SPARC64_Y_REGNUM].realreg = SPARC_L1_REGNUM; | |
386c036b MK |
119 | |
120 | /* The remaining `out' registers can be found in the current frame's | |
121 | `in' registers. */ | |
122 | delta = SPARC_I0_REGNUM - SPARC_O0_REGNUM; | |
123 | for (regnum = SPARC_O1_REGNUM; regnum <= SPARC_O5_REGNUM; regnum++) | |
1e067c66 MK |
124 | saved_regs[regnum].realreg = regnum + delta; |
125 | saved_regs[SPARC_O7_REGNUM].realreg = SPARC_I7_REGNUM; | |
386c036b MK |
126 | |
127 | /* The `local' and `in' registers have been saved in the register | |
128 | save area. */ | |
1e067c66 | 129 | addr = saved_regs[SPARC_SP_REGNUM].addr; |
94afd7a6 | 130 | sp = get_frame_memory_unsigned (this_frame, addr, 8); |
386c036b MK |
131 | for (regnum = SPARC_L0_REGNUM, addr = sp + BIAS; |
132 | regnum <= SPARC_I7_REGNUM; regnum++, addr += 8) | |
1e067c66 | 133 | saved_regs[regnum].addr = addr; |
386c036b | 134 | |
8391b9b1 MK |
135 | /* Handle StackGhost. */ |
136 | { | |
137 | ULONGEST wcookie = sparc_fetch_wcookie (); | |
138 | ||
139 | if (wcookie != 0) | |
140 | { | |
141 | ULONGEST i7; | |
142 | ||
143 | addr = saved_regs[SPARC_I7_REGNUM].addr; | |
94afd7a6 | 144 | i7 = get_frame_memory_unsigned (this_frame, addr, 8); |
8391b9b1 MK |
145 | trad_frame_set_value (saved_regs, SPARC_I7_REGNUM, i7 ^ wcookie); |
146 | } | |
147 | } | |
148 | ||
386c036b MK |
149 | /* TODO: Handle the floating-point registers. */ |
150 | ||
1e067c66 MK |
151 | return saved_regs; |
152 | } | |
153 | ||
154 | static struct sparc_frame_cache * | |
94afd7a6 | 155 | sparc64nbsd_sigcontext_frame_cache (struct frame_info *this_frame, |
1e067c66 MK |
156 | void **this_cache) |
157 | { | |
158 | struct sparc_frame_cache *cache; | |
159 | CORE_ADDR addr; | |
160 | ||
161 | if (*this_cache) | |
162 | return *this_cache; | |
163 | ||
94afd7a6 | 164 | cache = sparc_frame_cache (this_frame, this_cache); |
1e067c66 MK |
165 | gdb_assert (cache == *this_cache); |
166 | ||
167 | /* If we couldn't find the frame's function, we're probably dealing | |
168 | with an on-stack signal trampoline. */ | |
169 | if (cache->pc == 0) | |
170 | { | |
171 | cache->pc = sparc64nbsd_sigtramp_start; | |
172 | ||
173 | /* Since we couldn't find the frame's function, the cache was | |
174 | initialized under the assumption that we're frameless. */ | |
175 | cache->frameless_p = 0; | |
94afd7a6 | 176 | addr = get_frame_register_unsigned (this_frame, SPARC_FP_REGNUM); |
5b2d44a0 MK |
177 | if (addr & 1) |
178 | addr += BIAS; | |
1e067c66 MK |
179 | cache->base = addr; |
180 | } | |
181 | ||
182 | /* We find the appropriate instance of `struct sigcontext' at a | |
183 | fixed offset in the signal frame. */ | |
5b2d44a0 | 184 | addr = cache->base + 128 + 8; |
94afd7a6 | 185 | cache->saved_regs = sparc64nbsd_sigcontext_saved_regs (addr, this_frame); |
1e067c66 | 186 | |
386c036b MK |
187 | return cache; |
188 | } | |
189 | ||
190 | static void | |
94afd7a6 | 191 | sparc64nbsd_sigcontext_frame_this_id (struct frame_info *this_frame, |
386c036b MK |
192 | void **this_cache, |
193 | struct frame_id *this_id) | |
194 | { | |
195 | struct sparc_frame_cache *cache = | |
94afd7a6 | 196 | sparc64nbsd_sigcontext_frame_cache (this_frame, this_cache); |
386c036b MK |
197 | |
198 | (*this_id) = frame_id_build (cache->base, cache->pc); | |
199 | } | |
200 | ||
94afd7a6 UW |
201 | static struct value * |
202 | sparc64nbsd_sigcontext_frame_prev_register (struct frame_info *this_frame, | |
203 | void **this_cache, int regnum) | |
386c036b MK |
204 | { |
205 | struct sparc_frame_cache *cache = | |
94afd7a6 | 206 | sparc64nbsd_sigcontext_frame_cache (this_frame, this_cache); |
386c036b | 207 | |
94afd7a6 | 208 | return trad_frame_get_prev_register (this_frame, cache->saved_regs, regnum); |
386c036b MK |
209 | } |
210 | ||
94afd7a6 UW |
211 | static int |
212 | sparc64nbsd_sigtramp_frame_sniffer (const struct frame_unwind *self, | |
213 | struct frame_info *this_frame, | |
214 | void **this_cache) | |
386c036b | 215 | { |
94afd7a6 | 216 | CORE_ADDR pc = get_frame_pc (this_frame); |
386c036b MK |
217 | char *name; |
218 | ||
219 | find_pc_partial_function (pc, &name, NULL, NULL); | |
220 | if (sparc64nbsd_pc_in_sigtramp (pc, name)) | |
221 | { | |
222 | if (name == NULL || strncmp (name, "__sigtramp_sigcontext", 21)) | |
94afd7a6 | 223 | return 1; |
386c036b MK |
224 | } |
225 | ||
94afd7a6 | 226 | return 0; |
386c036b | 227 | } |
94afd7a6 UW |
228 | |
229 | static const struct frame_unwind sparc64nbsd_sigcontext_frame_unwind = | |
230 | { | |
231 | SIGTRAMP_FRAME, | |
232 | sparc64nbsd_sigcontext_frame_this_id, | |
233 | sparc64nbsd_sigcontext_frame_prev_register, | |
234 | NULL, | |
235 | sparc64nbsd_sigtramp_frame_sniffer | |
236 | }; | |
386c036b MK |
237 | \f |
238 | ||
239 | static void | |
240 | sparc64nbsd_init_abi (struct gdbarch_info info, struct gdbarch *gdbarch) | |
241 | { | |
2ca62865 MK |
242 | struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch); |
243 | ||
9ea75c57 | 244 | tdep->gregset = regset_alloc (gdbarch, sparc64nbsd_supply_gregset, NULL); |
2ca62865 MK |
245 | tdep->sizeof_gregset = 160; |
246 | ||
9ea75c57 | 247 | tdep->fpregset = regset_alloc (gdbarch, sparc64nbsd_supply_fpregset, NULL); |
2ca62865 MK |
248 | tdep->sizeof_fpregset = 272; |
249 | ||
c893be75 MK |
250 | /* Make sure we can single-step "new" syscalls. */ |
251 | tdep->step_trap = sparcnbsd_step_trap; | |
252 | ||
94afd7a6 | 253 | frame_unwind_append_unwinder (gdbarch, &sparc64nbsd_sigcontext_frame_unwind); |
386c036b MK |
254 | |
255 | sparc64_init_abi (info, gdbarch); | |
256 | ||
5b2d44a0 | 257 | /* NetBSD/sparc64 has SVR4-style shared libraries. */ |
3510d1f2 | 258 | set_gdbarch_skip_trampoline_code (gdbarch, find_solib_trampoline_target); |
386c036b | 259 | set_solib_svr4_fetch_link_map_offsets |
3510d1f2 | 260 | (gdbarch, svr4_lp64_fetch_link_map_offsets); |
386c036b | 261 | } |
386c036b | 262 | \f |
5b2d44a0 | 263 | |
386c036b MK |
264 | /* Provide a prototype to silence -Wmissing-prototypes. */ |
265 | void _initialize_sparc64nbsd_tdep (void); | |
266 | ||
267 | void | |
268 | _initialize_sparc64nbsd_tdep (void) | |
269 | { | |
270 | gdbarch_register_osabi (bfd_arch_sparc, bfd_mach_sparc_v9, | |
271 | GDB_OSABI_NETBSD_ELF, sparc64nbsd_init_abi); | |
386c036b | 272 | } |