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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" | |
29 | #include "symtab.h" | |
30 | #include "solib-svr4.h" | |
31 | #include "trad-frame.h" | |
32 | ||
33 | #include "gdb_assert.h" | |
34 | #include "gdb_string.h" | |
35 | ||
36 | #include "sparc64-tdep.h" | |
37 | #include "nbsd-tdep.h" | |
38 | ||
39 | /* From <machine/reg.h>. */ | |
40 | const struct sparc_gregset sparc64nbsd_gregset = | |
41 | { | |
42 | 0 * 8, /* "tstate" */ | |
43 | 1 * 8, /* %pc */ | |
44 | 2 * 8, /* %npc */ | |
45 | 3 * 8, /* %y */ | |
46 | -1, /* %fprs */ | |
47 | -1, | |
48 | 5 * 8, /* %g1 */ | |
49 | -1, /* %l0 */ | |
50 | 4 /* sizeof (%y) */ | |
51 | }; | |
52 | ||
53 | /* Size of `struct reg' and `struct fpreg'. */ | |
54 | static const int sparc64nbsd_sizeof_struct_reg = 160; | |
55 | static const int sparc64nbsd_sizeof_struct_fpreg = 272; | |
56 | ||
57 | static void | |
58 | fetch_core_registers (char *core_reg_sect, unsigned core_reg_size, int which, | |
59 | CORE_ADDR ignore) | |
60 | { | |
61 | switch (which) | |
62 | { | |
63 | case 0: /* Integer registers */ | |
64 | if (core_reg_size != sparc64nbsd_sizeof_struct_reg) | |
65 | warning ("Wrong size register set in core file."); | |
66 | else | |
67 | sparc64_supply_gregset (&sparc64nbsd_gregset, current_regcache, | |
68 | -1, core_reg_sect); | |
69 | break; | |
70 | ||
71 | case 2: /* Floating pointer registers */ | |
72 | if (core_reg_size != sparc64nbsd_sizeof_struct_fpreg) | |
73 | warning ("Wrong size FP register set in core file."); | |
74 | else | |
75 | sparc64_supply_fpregset (current_regcache, -1, core_reg_sect); | |
76 | break; | |
77 | ||
78 | default: | |
79 | /* Don't know what kind of register request this is; just ignore it. */ | |
80 | break; | |
81 | } | |
82 | } | |
83 | ||
84 | static struct core_fns sparc64nbsd_core_fns = | |
85 | { | |
86 | bfd_target_elf_flavour, /* core_flavour */ | |
87 | default_check_format, /* check_format */ | |
88 | default_core_sniffer, /* core_sniffer */ | |
89 | fetch_core_registers, /* core_read_registers */ | |
90 | NULL | |
91 | }; | |
92 | \f | |
93 | /* Signal trampolines. */ | |
94 | ||
95 | /* The following variables describe the location of an on-stack signal | |
96 | trampoline. The current values correspond to the memory layout for | |
97 | NetBSD 1.3 and up. These shouldn't be necessary for NetBSD 2.0 and | |
98 | up, since NetBSD uses signal trampolines provided by libc now. */ | |
99 | ||
100 | static const CORE_ADDR sparc64nbsd_sigtramp_start = 0xffffffffffffdee4ULL; | |
101 | static const CORE_ADDR sparc64nbsd_sigtramp_end = 0xffffffffffffe000ULL; | |
102 | ||
103 | static int | |
104 | sparc64nbsd_pc_in_sigtramp (CORE_ADDR pc, char *name) | |
105 | { | |
106 | if (pc >= sparc64nbsd_sigtramp_start && pc < sparc64nbsd_sigtramp_end) | |
107 | return 1; | |
108 | ||
109 | return nbsd_pc_in_sigtramp (pc, name); | |
110 | } | |
111 | ||
112 | static struct sparc_frame_cache * | |
113 | sparc64nbsd_sigcontext_frame_cache (struct frame_info *next_frame, | |
114 | void **this_cache) | |
115 | { | |
116 | struct sparc_frame_cache *cache; | |
117 | CORE_ADDR addr, sigcontext_addr, sp; | |
118 | LONGEST fprs; | |
119 | int regnum, delta; | |
120 | ||
121 | if (*this_cache) | |
122 | return *this_cache; | |
123 | ||
124 | cache = sparc_frame_cache (next_frame, this_cache); | |
125 | gdb_assert (cache == *this_cache); | |
126 | ||
127 | /* The registers are saved in bits and pieces scattered all over the | |
128 | place. The code below records their location on the assumption | |
129 | that the part of the signal trampoline that saves the state has | |
130 | been executed. */ | |
131 | ||
132 | /* If we couldn't find the frame's function, we're probably dealing | |
133 | with an on-stack signal trampoline. */ | |
134 | if (cache->pc == 0) | |
135 | { | |
136 | cache->pc = sparc64nbsd_sigtramp_start; | |
137 | ||
138 | /* Since we couldn't find the frame's function, the cache was | |
139 | initialized under the assumption that we're frameless. */ | |
140 | cache->frameless_p = 0; | |
141 | addr = frame_unwind_register_unsigned (next_frame, SPARC_FP_REGNUM); | |
142 | cache->base = addr; | |
143 | } | |
144 | ||
145 | cache->saved_regs = trad_frame_alloc_saved_regs (next_frame); | |
146 | ||
147 | /* We find the appropriate instance of `struct sigcontext' at a | |
148 | fixed offset in the signal frame. */ | |
149 | sigcontext_addr = cache->base + BIAS + 128 + 8; | |
150 | ||
151 | cache->saved_regs[SPARC_SP_REGNUM].addr = sigcontext_addr + 8; | |
152 | cache->saved_regs[SPARC64_PC_REGNUM].addr = sigcontext_addr + 16; | |
153 | cache->saved_regs[SPARC64_NPC_REGNUM].addr = sigcontext_addr + 24; | |
154 | cache->saved_regs[SPARC64_STATE_REGNUM].addr = sigcontext_addr + 32; | |
155 | cache->saved_regs[SPARC_G1_REGNUM].addr = sigcontext_addr + 40; | |
156 | cache->saved_regs[SPARC_O0_REGNUM].addr = sigcontext_addr + 48; | |
157 | ||
158 | /* The remaining `global' registers and %y are saved in the `local' | |
159 | registers. */ | |
160 | delta = SPARC_L0_REGNUM - SPARC_G0_REGNUM; | |
161 | for (regnum = SPARC_G2_REGNUM; regnum <= SPARC_G7_REGNUM; regnum++) | |
162 | cache->saved_regs[regnum].realreg = regnum + delta; | |
163 | cache->saved_regs[SPARC64_Y_REGNUM].realreg = SPARC_L1_REGNUM; | |
164 | ||
165 | /* The remaining `out' registers can be found in the current frame's | |
166 | `in' registers. */ | |
167 | delta = SPARC_I0_REGNUM - SPARC_O0_REGNUM; | |
168 | for (regnum = SPARC_O1_REGNUM; regnum <= SPARC_O5_REGNUM; regnum++) | |
169 | cache->saved_regs[regnum].realreg = regnum + delta; | |
170 | cache->saved_regs[SPARC_O7_REGNUM].realreg = SPARC_I7_REGNUM; | |
171 | ||
172 | /* The `local' and `in' registers have been saved in the register | |
173 | save area. */ | |
174 | addr = cache->saved_regs[SPARC_SP_REGNUM].addr; | |
175 | sp = get_frame_memory_unsigned (next_frame, addr, 8); | |
176 | for (regnum = SPARC_L0_REGNUM, addr = sp + BIAS; | |
177 | regnum <= SPARC_I7_REGNUM; regnum++, addr += 8) | |
178 | cache->saved_regs[regnum].addr = addr; | |
179 | ||
180 | /* TODO: Handle the floating-point registers. */ | |
181 | ||
182 | return cache; | |
183 | } | |
184 | ||
185 | static void | |
186 | sparc64nbsd_sigcontext_frame_this_id (struct frame_info *next_frame, | |
187 | void **this_cache, | |
188 | struct frame_id *this_id) | |
189 | { | |
190 | struct sparc_frame_cache *cache = | |
191 | sparc64nbsd_sigcontext_frame_cache (next_frame, this_cache); | |
192 | ||
193 | (*this_id) = frame_id_build (cache->base, cache->pc); | |
194 | } | |
195 | ||
196 | static void | |
197 | sparc64nbsd_sigcontext_frame_prev_register (struct frame_info *next_frame, | |
198 | void **this_cache, | |
199 | int regnum, int *optimizedp, | |
200 | enum lval_type *lvalp, | |
201 | CORE_ADDR *addrp, | |
202 | int *realnump, void *valuep) | |
203 | { | |
204 | struct sparc_frame_cache *cache = | |
205 | sparc64nbsd_sigcontext_frame_cache (next_frame, this_cache); | |
206 | ||
207 | trad_frame_prev_register (next_frame, cache->saved_regs, regnum, | |
208 | optimizedp, lvalp, addrp, realnump, valuep); | |
209 | } | |
210 | ||
211 | static const struct frame_unwind sparc64nbsd_sigcontext_frame_unwind = | |
212 | { | |
213 | SIGTRAMP_FRAME, | |
214 | sparc64nbsd_sigcontext_frame_this_id, | |
215 | sparc64nbsd_sigcontext_frame_prev_register | |
216 | }; | |
217 | ||
218 | static const struct frame_unwind * | |
219 | sparc64nbsd_sigtramp_frame_sniffer (struct frame_info *next_frame) | |
220 | { | |
221 | CORE_ADDR pc = frame_pc_unwind (next_frame); | |
222 | char *name; | |
223 | ||
224 | find_pc_partial_function (pc, &name, NULL, NULL); | |
225 | if (sparc64nbsd_pc_in_sigtramp (pc, name)) | |
226 | { | |
227 | if (name == NULL || strncmp (name, "__sigtramp_sigcontext", 21)) | |
228 | return &sparc64nbsd_sigcontext_frame_unwind; | |
229 | } | |
230 | ||
231 | return NULL; | |
232 | } | |
233 | \f | |
234 | ||
235 | static void | |
236 | sparc64nbsd_init_abi (struct gdbarch_info info, struct gdbarch *gdbarch) | |
237 | { | |
238 | set_gdbarch_pc_in_sigtramp (gdbarch, sparc64nbsd_pc_in_sigtramp); | |
239 | frame_unwind_append_sniffer (gdbarch, sparc64nbsd_sigtramp_frame_sniffer); | |
240 | ||
241 | sparc64_init_abi (info, gdbarch); | |
242 | ||
243 | set_solib_svr4_fetch_link_map_offsets | |
244 | (gdbarch, nbsd_lp64_solib_svr4_fetch_link_map_offsets); | |
245 | } | |
246 | ||
247 | \f | |
248 | /* Provide a prototype to silence -Wmissing-prototypes. */ | |
249 | void _initialize_sparc64nbsd_tdep (void); | |
250 | ||
251 | void | |
252 | _initialize_sparc64nbsd_tdep (void) | |
253 | { | |
254 | gdbarch_register_osabi (bfd_arch_sparc, bfd_mach_sparc_v9, | |
255 | GDB_OSABI_NETBSD_ELF, sparc64nbsd_init_abi); | |
256 | ||
257 | add_core_fns (&sparc64nbsd_core_fns); | |
258 | } |