Commit | Line | Data |
---|---|---|
da8ca43d | 1 | /* Target-dependent code for NetBSD/Alpha. |
2031c21a MK |
2 | |
3 | Copyright 2002, 2003, 2004 Free Software Foundation, Inc. | |
da8ca43d 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" | |
24 | #include "gdbcore.h" | |
2ca8ae21 | 25 | #include "frame.h" |
8513dd2d | 26 | #include "regcache.h" |
da8ca43d | 27 | #include "value.h" |
4be87837 | 28 | #include "osabi.h" |
da8ca43d | 29 | |
9964235a JT |
30 | #include "solib-svr4.h" |
31 | ||
da8ca43d | 32 | #include "alpha-tdep.h" |
8513dd2d | 33 | #include "alphabsd-tdep.h" |
ea5bc2a6 | 34 | #include "nbsd-tdep.h" |
8513dd2d JT |
35 | |
36 | static void | |
37 | fetch_core_registers (char *core_reg_sect, unsigned core_reg_size, int which, | |
38 | CORE_ADDR ignore) | |
39 | { | |
40 | char *regs, *fpregs; | |
41 | int regno; | |
42 | ||
43 | /* Table to map a gdb register number to a trapframe register index. */ | |
44 | static const int regmap[] = | |
45 | { | |
46 | 0, 1, 2, 3, | |
47 | 4, 5, 6, 7, | |
48 | 8, 9, 10, 11, | |
49 | 12, 13, 14, 15, | |
50 | 30, 31, 32, 16, | |
51 | 17, 18, 19, 20, | |
52 | 21, 22, 23, 24, | |
53 | 25, 29, 26 | |
54 | }; | |
55 | #define SIZEOF_TRAPFRAME (33 * 8) | |
56 | ||
57 | /* We get everything from one section. */ | |
58 | if (which != 0) | |
59 | return; | |
60 | ||
61 | regs = core_reg_sect; | |
62 | fpregs = core_reg_sect + SIZEOF_TRAPFRAME; | |
63 | ||
64 | if (core_reg_size < (SIZEOF_TRAPFRAME + SIZEOF_STRUCT_FPREG)) | |
65 | { | |
66 | warning ("Wrong size register set in core file."); | |
67 | return; | |
68 | } | |
69 | ||
70 | /* Integer registers. */ | |
71 | for (regno = 0; regno < ALPHA_ZERO_REGNUM; regno++) | |
72 | supply_register (regno, regs + (regmap[regno] * 8)); | |
73 | supply_register (ALPHA_ZERO_REGNUM, NULL); | |
8513dd2d JT |
74 | supply_register (PC_REGNUM, regs + (28 * 8)); |
75 | ||
76 | /* Floating point registers. */ | |
77 | alphabsd_supply_fpreg (fpregs, -1); | |
78 | } | |
79 | ||
80 | static void | |
81 | fetch_elfcore_registers (char *core_reg_sect, unsigned core_reg_size, int which, | |
82 | CORE_ADDR ignore) | |
83 | { | |
84 | switch (which) | |
85 | { | |
86 | case 0: /* Integer registers. */ | |
87 | if (core_reg_size != SIZEOF_STRUCT_REG) | |
88 | warning ("Wrong size register set in core file."); | |
89 | else | |
90 | alphabsd_supply_reg (core_reg_sect, -1); | |
91 | break; | |
92 | ||
93 | case 2: /* Floating point registers. */ | |
94 | if (core_reg_size != SIZEOF_STRUCT_FPREG) | |
95 | warning ("Wrong size FP register set in core file."); | |
96 | else | |
97 | alphabsd_supply_fpreg (core_reg_sect, -1); | |
98 | break; | |
99 | ||
100 | default: | |
101 | /* Don't know what kind of register request this is; just ignore it. */ | |
102 | break; | |
103 | } | |
104 | } | |
105 | ||
106 | static struct core_fns alphanbsd_core_fns = | |
107 | { | |
108 | bfd_target_unknown_flavour, /* core_flavour */ | |
109 | default_check_format, /* check_format */ | |
110 | default_core_sniffer, /* core_sniffer */ | |
111 | fetch_core_registers, /* core_read_registers */ | |
112 | NULL /* next */ | |
113 | }; | |
114 | ||
115 | static struct core_fns alphanbsd_elfcore_fns = | |
116 | { | |
117 | bfd_target_elf_flavour, /* core_flavour */ | |
118 | default_check_format, /* check_format */ | |
119 | default_core_sniffer, /* core_sniffer */ | |
120 | fetch_elfcore_registers, /* core_read_registers */ | |
121 | NULL /* next */ | |
122 | }; | |
da8ca43d | 123 | |
da8ca43d JT |
124 | /* Under NetBSD/alpha, signal handler invocations can be identified by the |
125 | designated code sequence that is used to return from a signal handler. | |
126 | In particular, the return address of a signal handler points to the | |
127 | following code sequence: | |
128 | ||
129 | ldq a0, 0(sp) | |
130 | lda sp, 16(sp) | |
131 | lda v0, 295(zero) # __sigreturn14 | |
132 | call_pal callsys | |
133 | ||
134 | Each instruction has a unique encoding, so we simply attempt to match | |
135 | the instruction the PC is pointing to with any of the above instructions. | |
136 | If there is a hit, we know the offset to the start of the designated | |
137 | sequence and can then check whether we really are executing in the | |
138 | signal trampoline. If not, -1 is returned, otherwise the offset from the | |
139 | start of the return sequence is returned. */ | |
cfef91e4 | 140 | static const unsigned char sigtramp_retcode[] = |
da8ca43d | 141 | { |
cfef91e4 JT |
142 | 0x00, 0x00, 0x1e, 0xa6, /* ldq a0, 0(sp) */ |
143 | 0x10, 0x00, 0xde, 0x23, /* lda sp, 16(sp) */ | |
144 | 0x27, 0x01, 0x1f, 0x20, /* lda v0, 295(zero) */ | |
145 | 0x83, 0x00, 0x00, 0x00, /* call_pal callsys */ | |
da8ca43d | 146 | }; |
cfef91e4 JT |
147 | #define RETCODE_NWORDS 4 |
148 | #define RETCODE_SIZE (RETCODE_NWORDS * 4) | |
da8ca43d JT |
149 | |
150 | LONGEST | |
151 | alphanbsd_sigtramp_offset (CORE_ADDR pc) | |
152 | { | |
cfef91e4 | 153 | unsigned char ret[RETCODE_SIZE], w[4]; |
da8ca43d JT |
154 | LONGEST off; |
155 | int i; | |
156 | ||
cfef91e4 | 157 | if (read_memory_nobpt (pc, (char *) w, 4) != 0) |
da8ca43d JT |
158 | return -1; |
159 | ||
160 | for (i = 0; i < RETCODE_NWORDS; i++) | |
161 | { | |
cfef91e4 | 162 | if (memcmp (w, sigtramp_retcode + (i * 4), 4) == 0) |
da8ca43d JT |
163 | break; |
164 | } | |
165 | if (i == RETCODE_NWORDS) | |
166 | return (-1); | |
167 | ||
168 | off = i * 4; | |
169 | pc -= off; | |
170 | ||
171 | if (read_memory_nobpt (pc, (char *) ret, sizeof (ret)) != 0) | |
172 | return -1; | |
173 | ||
cfef91e4 | 174 | if (memcmp (ret, sigtramp_retcode, RETCODE_SIZE) == 0) |
da8ca43d JT |
175 | return off; |
176 | ||
177 | return -1; | |
178 | } | |
179 | ||
6c72f9f9 JT |
180 | static int |
181 | alphanbsd_pc_in_sigtramp (CORE_ADDR pc, char *func_name) | |
182 | { | |
3d9b49b0 JT |
183 | return (nbsd_pc_in_sigtramp (pc, func_name) |
184 | || alphanbsd_sigtramp_offset (pc) >= 0); | |
6c72f9f9 JT |
185 | } |
186 | ||
2ca8ae21 JT |
187 | static CORE_ADDR |
188 | alphanbsd_sigcontext_addr (struct frame_info *frame) | |
189 | { | |
190 | /* FIXME: This is not correct for all versions of NetBSD/alpha. | |
191 | We will probably need to disassemble the trampoline to figure | |
192 | out which trampoline frame type we have. */ | |
f534e522 | 193 | return get_frame_base (frame); |
2ca8ae21 JT |
194 | } |
195 | ||
da8ca43d JT |
196 | static void |
197 | alphanbsd_init_abi (struct gdbarch_info info, | |
198 | struct gdbarch *gdbarch) | |
199 | { | |
200 | struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch); | |
201 | ||
baa490c4 RH |
202 | /* Hook into the DWARF CFI frame unwinder. */ |
203 | alpha_dwarf2_init_abi (info, gdbarch); | |
204 | ||
205 | /* Hook into the MDEBUG frame unwinder. */ | |
206 | alpha_mdebug_init_abi (info, gdbarch); | |
207 | ||
f561f026 | 208 | set_gdbarch_deprecated_pc_in_sigtramp (gdbarch, alphanbsd_pc_in_sigtramp); |
6c72f9f9 | 209 | |
da8ca43d JT |
210 | /* NetBSD/alpha does not provide single step support via ptrace(2); we |
211 | must use software single-stepping. */ | |
212 | set_gdbarch_software_single_step (gdbarch, alpha_software_single_step); | |
213 | ||
214 | set_solib_svr4_fetch_link_map_offsets (gdbarch, | |
ea5bc2a6 | 215 | nbsd_lp64_solib_svr4_fetch_link_map_offsets); |
da8ca43d JT |
216 | |
217 | tdep->dynamic_sigtramp_offset = alphanbsd_sigtramp_offset; | |
2ca8ae21 | 218 | tdep->sigcontext_addr = alphanbsd_sigcontext_addr; |
accc6d1f JT |
219 | |
220 | tdep->jb_pc = 2; | |
221 | tdep->jb_elt_size = 8; | |
da8ca43d JT |
222 | } |
223 | ||
224 | void | |
225 | _initialize_alphanbsd_tdep (void) | |
226 | { | |
05816f70 | 227 | gdbarch_register_osabi (bfd_arch_alpha, 0, GDB_OSABI_NETBSD_ELF, |
70f80edf | 228 | alphanbsd_init_abi); |
2031c21a MK |
229 | gdbarch_register_osabi (bfd_arch_alpha, 0, GDB_OSABI_OPENBSD_ELF, |
230 | alphanbsd_init_abi); | |
8513dd2d | 231 | |
00e32a35 AC |
232 | deprecated_add_core_fns (&alphanbsd_core_fns); |
233 | deprecated_add_core_fns (&alphanbsd_elfcore_fns); | |
da8ca43d | 234 | } |