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386c036b MK |
1 | /* Target-dependent code for NetBSD/sparc64. |
2 | ||
3 | Copyright 2002, 2003, 2004 Free Software Foundation, Inc. | |
4 | Based on code 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 "frame.h" | |
25 | #include "frame-unwind.h" | |
26 | #include "gdbcore.h" | |
27 | #include "osabi.h" | |
28 | #include "regcache.h" | |
2ca62865 | 29 | #include "regset.h" |
386c036b MK |
30 | #include "symtab.h" |
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 | { |
2ca62865 | 60 | sparc64_supply_gregset (regset->descr, 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 | ||
91 | static struct sparc_frame_cache * | |
92 | sparc64nbsd_sigcontext_frame_cache (struct frame_info *next_frame, | |
93 | void **this_cache) | |
94 | { | |
95 | struct sparc_frame_cache *cache; | |
96 | CORE_ADDR addr, sigcontext_addr, sp; | |
97 | LONGEST fprs; | |
98 | int regnum, delta; | |
99 | ||
100 | if (*this_cache) | |
101 | return *this_cache; | |
102 | ||
103 | cache = sparc_frame_cache (next_frame, this_cache); | |
104 | gdb_assert (cache == *this_cache); | |
105 | ||
106 | /* The registers are saved in bits and pieces scattered all over the | |
107 | place. The code below records their location on the assumption | |
108 | that the part of the signal trampoline that saves the state has | |
109 | been executed. */ | |
110 | ||
111 | /* If we couldn't find the frame's function, we're probably dealing | |
112 | with an on-stack signal trampoline. */ | |
113 | if (cache->pc == 0) | |
114 | { | |
115 | cache->pc = sparc64nbsd_sigtramp_start; | |
116 | ||
117 | /* Since we couldn't find the frame's function, the cache was | |
118 | initialized under the assumption that we're frameless. */ | |
119 | cache->frameless_p = 0; | |
120 | addr = frame_unwind_register_unsigned (next_frame, SPARC_FP_REGNUM); | |
121 | cache->base = addr; | |
122 | } | |
123 | ||
124 | cache->saved_regs = trad_frame_alloc_saved_regs (next_frame); | |
125 | ||
126 | /* We find the appropriate instance of `struct sigcontext' at a | |
127 | fixed offset in the signal frame. */ | |
128 | sigcontext_addr = cache->base + BIAS + 128 + 8; | |
129 | ||
130 | cache->saved_regs[SPARC_SP_REGNUM].addr = sigcontext_addr + 8; | |
131 | cache->saved_regs[SPARC64_PC_REGNUM].addr = sigcontext_addr + 16; | |
132 | cache->saved_regs[SPARC64_NPC_REGNUM].addr = sigcontext_addr + 24; | |
133 | cache->saved_regs[SPARC64_STATE_REGNUM].addr = sigcontext_addr + 32; | |
134 | cache->saved_regs[SPARC_G1_REGNUM].addr = sigcontext_addr + 40; | |
135 | cache->saved_regs[SPARC_O0_REGNUM].addr = sigcontext_addr + 48; | |
136 | ||
137 | /* The remaining `global' registers and %y are saved in the `local' | |
138 | registers. */ | |
139 | delta = SPARC_L0_REGNUM - SPARC_G0_REGNUM; | |
140 | for (regnum = SPARC_G2_REGNUM; regnum <= SPARC_G7_REGNUM; regnum++) | |
141 | cache->saved_regs[regnum].realreg = regnum + delta; | |
142 | cache->saved_regs[SPARC64_Y_REGNUM].realreg = SPARC_L1_REGNUM; | |
143 | ||
144 | /* The remaining `out' registers can be found in the current frame's | |
145 | `in' registers. */ | |
146 | delta = SPARC_I0_REGNUM - SPARC_O0_REGNUM; | |
147 | for (regnum = SPARC_O1_REGNUM; regnum <= SPARC_O5_REGNUM; regnum++) | |
148 | cache->saved_regs[regnum].realreg = regnum + delta; | |
149 | cache->saved_regs[SPARC_O7_REGNUM].realreg = SPARC_I7_REGNUM; | |
150 | ||
151 | /* The `local' and `in' registers have been saved in the register | |
152 | save area. */ | |
153 | addr = cache->saved_regs[SPARC_SP_REGNUM].addr; | |
154 | sp = get_frame_memory_unsigned (next_frame, addr, 8); | |
155 | for (regnum = SPARC_L0_REGNUM, addr = sp + BIAS; | |
156 | regnum <= SPARC_I7_REGNUM; regnum++, addr += 8) | |
157 | cache->saved_regs[regnum].addr = addr; | |
158 | ||
159 | /* TODO: Handle the floating-point registers. */ | |
160 | ||
161 | return cache; | |
162 | } | |
163 | ||
164 | static void | |
165 | sparc64nbsd_sigcontext_frame_this_id (struct frame_info *next_frame, | |
166 | void **this_cache, | |
167 | struct frame_id *this_id) | |
168 | { | |
169 | struct sparc_frame_cache *cache = | |
170 | sparc64nbsd_sigcontext_frame_cache (next_frame, this_cache); | |
171 | ||
172 | (*this_id) = frame_id_build (cache->base, cache->pc); | |
173 | } | |
174 | ||
175 | static void | |
176 | sparc64nbsd_sigcontext_frame_prev_register (struct frame_info *next_frame, | |
177 | void **this_cache, | |
178 | int regnum, int *optimizedp, | |
179 | enum lval_type *lvalp, | |
180 | CORE_ADDR *addrp, | |
181 | int *realnump, void *valuep) | |
182 | { | |
183 | struct sparc_frame_cache *cache = | |
184 | sparc64nbsd_sigcontext_frame_cache (next_frame, this_cache); | |
185 | ||
186 | trad_frame_prev_register (next_frame, cache->saved_regs, regnum, | |
187 | optimizedp, lvalp, addrp, realnump, valuep); | |
188 | } | |
189 | ||
190 | static const struct frame_unwind sparc64nbsd_sigcontext_frame_unwind = | |
191 | { | |
192 | SIGTRAMP_FRAME, | |
193 | sparc64nbsd_sigcontext_frame_this_id, | |
194 | sparc64nbsd_sigcontext_frame_prev_register | |
195 | }; | |
196 | ||
197 | static const struct frame_unwind * | |
198 | sparc64nbsd_sigtramp_frame_sniffer (struct frame_info *next_frame) | |
199 | { | |
200 | CORE_ADDR pc = frame_pc_unwind (next_frame); | |
201 | char *name; | |
202 | ||
203 | find_pc_partial_function (pc, &name, NULL, NULL); | |
204 | if (sparc64nbsd_pc_in_sigtramp (pc, name)) | |
205 | { | |
206 | if (name == NULL || strncmp (name, "__sigtramp_sigcontext", 21)) | |
207 | return &sparc64nbsd_sigcontext_frame_unwind; | |
208 | } | |
209 | ||
210 | return NULL; | |
211 | } | |
212 | \f | |
213 | ||
214 | static void | |
215 | sparc64nbsd_init_abi (struct gdbarch_info info, struct gdbarch *gdbarch) | |
216 | { | |
2ca62865 MK |
217 | struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch); |
218 | ||
219 | tdep->gregset = XMALLOC (struct regset); | |
220 | tdep->gregset->descr = &sparc64nbsd_gregset; | |
221 | tdep->gregset->supply_regset = sparc64nbsd_supply_gregset; | |
222 | tdep->sizeof_gregset = 160; | |
223 | ||
224 | tdep->fpregset = XMALLOC (struct regset); | |
225 | tdep->fpregset->supply_regset = sparc64nbsd_supply_fpregset; | |
226 | tdep->sizeof_fpregset = 272; | |
227 | ||
386c036b MK |
228 | set_gdbarch_pc_in_sigtramp (gdbarch, sparc64nbsd_pc_in_sigtramp); |
229 | frame_unwind_append_sniffer (gdbarch, sparc64nbsd_sigtramp_frame_sniffer); | |
230 | ||
231 | sparc64_init_abi (info, gdbarch); | |
232 | ||
233 | set_solib_svr4_fetch_link_map_offsets | |
234 | (gdbarch, nbsd_lp64_solib_svr4_fetch_link_map_offsets); | |
235 | } | |
236 | ||
237 | \f | |
238 | /* Provide a prototype to silence -Wmissing-prototypes. */ | |
239 | void _initialize_sparc64nbsd_tdep (void); | |
240 | ||
241 | void | |
242 | _initialize_sparc64nbsd_tdep (void) | |
243 | { | |
244 | gdbarch_register_osabi (bfd_arch_sparc, bfd_mach_sparc_v9, | |
245 | GDB_OSABI_NETBSD_ELF, sparc64nbsd_init_abi); | |
386c036b | 246 | } |