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1b883d35 KW |
1 | /* i386-nto-tdep.c - i386 specific functionality for QNX Neutrino. |
2 | ||
3 | Copyright 2003 Free Software Foundation, Inc. | |
4 | ||
5 | Contributed by QNX Software Systems Ltd. | |
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 | |
11 | the Free Software Foundation; either version 2 of the License, or | |
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 | |
20 | along with this program; if not, write to the Free Software | |
21 | Foundation, Inc., 59 Temple Place - Suite 330, | |
22 | Boston, MA 02111-1307, USA. */ | |
23 | ||
24 | #include "gdb_string.h" | |
25 | #include "gdb_assert.h" | |
26 | #include "defs.h" | |
27 | #include "frame.h" | |
28 | #include "target.h" | |
29 | #include "regcache.h" | |
30 | #include "solib-svr4.h" | |
31 | #include "i386-tdep.h" | |
32 | #include "nto-tdep.h" | |
33 | #include "osabi.h" | |
34 | #include "i387-tdep.h" | |
35 | ||
36 | #ifndef X86_CPU_FXSR | |
37 | #define X86_CPU_FXSR (1L << 12) | |
38 | #endif | |
39 | ||
40 | /* Why 13? Look in our /usr/include/x86/context.h header at the | |
41 | x86_cpu_registers structure and you'll see an 'exx' junk register | |
42 | that is just filler. Don't ask me, ask the kernel guys. */ | |
43 | #define NUM_GPREGS 13 | |
44 | ||
45 | /* Map a GDB register number to an offset in the reg structure. */ | |
46 | static int regmap[] = { | |
47 | (7 * 4), /* eax */ | |
48 | (6 * 4), /* ecx */ | |
49 | (5 * 4), /* edx */ | |
50 | (4 * 4), /* ebx */ | |
51 | (11 * 4), /* esp */ | |
52 | (2 * 4), /* epb */ | |
53 | (1 * 4), /* esi */ | |
54 | (0 * 4), /* edi */ | |
55 | (8 * 4), /* eip */ | |
56 | (10 * 4), /* eflags */ | |
57 | (9 * 4), /* cs */ | |
58 | (12 * 4), /* ss */ | |
59 | (-1 * 4) /* filler */ | |
60 | }; | |
61 | ||
62 | /* Given a gdb regno, return the offset into Neutrino's register structure | |
63 | or -1 if register is unknown. */ | |
64 | static int | |
65 | nto_reg_offset (int regno) | |
66 | { | |
67 | return (regno >= 0 && regno < NUM_GPREGS) ? regmap[regno] : -1; | |
68 | } | |
69 | ||
70 | static void | |
71 | i386nto_supply_gregset (char *gpregs) | |
72 | { | |
73 | unsigned regno; | |
74 | int empty = 0; | |
75 | ||
76 | for (regno = 0; regno < FP0_REGNUM; regno++) | |
77 | { | |
78 | int offset = nto_reg_offset (regno); | |
79 | if (offset == -1) | |
80 | supply_register (regno, (char *) &empty); | |
81 | else | |
82 | supply_register (regno, gpregs + offset); | |
83 | } | |
84 | } | |
85 | ||
86 | static void | |
87 | i386nto_supply_fpregset (char *fpregs) | |
88 | { | |
89 | if (nto_cpuinfo_valid && nto_cpuinfo_flags | X86_CPU_FXSR) | |
41d041d6 | 90 | i387_supply_fxsave (current_regcache, -1, fpregs); |
1b883d35 | 91 | else |
41d041d6 | 92 | i387_supply_fsave (current_regcache, -1, fpregs); |
1b883d35 KW |
93 | } |
94 | ||
95 | static void | |
96 | i386nto_supply_regset (int regset, char *data) | |
97 | { | |
98 | switch (regset) | |
99 | { | |
100 | case NTO_REG_GENERAL: /* QNX has different ordering of GP regs than GDB. */ | |
101 | i386nto_supply_gregset (data); | |
102 | break; | |
103 | case NTO_REG_FLOAT: | |
104 | i386nto_supply_fpregset (data); | |
105 | break; | |
106 | } | |
107 | } | |
108 | ||
109 | static int | |
110 | i386nto_regset_id (int regno) | |
111 | { | |
112 | if (regno == -1) | |
113 | return NTO_REG_END; | |
114 | else if (regno < FP0_REGNUM) | |
115 | return NTO_REG_GENERAL; | |
116 | else if (regno < FPC_REGNUM) | |
117 | return NTO_REG_FLOAT; | |
118 | ||
119 | return -1; /* Error. */ | |
120 | } | |
121 | ||
122 | static int | |
123 | i386nto_register_area (int regno, int regset, unsigned *off) | |
124 | { | |
125 | int len; | |
126 | ||
127 | *off = 0; | |
128 | if (regset == NTO_REG_GENERAL) | |
129 | { | |
130 | if (regno == -1) | |
131 | return NUM_GPREGS * 4; | |
132 | ||
133 | *off = nto_reg_offset (regno); | |
134 | if (*off == -1) | |
135 | return 0; | |
136 | return 4; | |
137 | } | |
138 | else if (regset == NTO_REG_FLOAT) | |
139 | { | |
140 | unsigned off_adjust, regsize, regset_size; | |
141 | ||
142 | if (nto_cpuinfo_valid && nto_cpuinfo_flags | X86_CPU_FXSR) | |
143 | { | |
144 | off_adjust = 32; | |
145 | regsize = 16; | |
146 | regset_size = 512; | |
147 | } | |
148 | else | |
149 | { | |
150 | off_adjust = 28; | |
151 | regsize = 10; | |
152 | regset_size = 128; | |
153 | } | |
154 | ||
155 | if (regno == -1) | |
156 | return regset_size; | |
157 | ||
158 | *off = (regno - FP0_REGNUM) * regsize + off_adjust; | |
159 | return 10; | |
160 | /* Why 10 instead of regsize? GDB only stores 10 bytes per FP | |
161 | register so if we're sending a register back to the target, | |
162 | we only want pdebug to write 10 bytes so as not to clobber | |
163 | the reserved 6 bytes in the fxsave structure. */ | |
164 | } | |
165 | return -1; | |
166 | } | |
167 | ||
168 | static int | |
169 | i386nto_regset_fill (int regset, char *data) | |
170 | { | |
171 | if (regset == NTO_REG_GENERAL) | |
172 | { | |
173 | int regno; | |
174 | ||
175 | for (regno = 0; regno < NUM_GPREGS; regno++) | |
176 | { | |
177 | int offset = nto_reg_offset (regno); | |
178 | if (offset != -1) | |
179 | regcache_collect (regno, data + offset); | |
180 | } | |
181 | } | |
182 | else if (regset == NTO_REG_FLOAT) | |
183 | { | |
184 | if (nto_cpuinfo_valid && nto_cpuinfo_flags | X86_CPU_FXSR) | |
185 | i387_fill_fxsave (data, -1); | |
186 | else | |
187 | i387_fill_fsave (data, -1); | |
188 | } | |
189 | else | |
190 | return -1; | |
191 | ||
192 | return 0; | |
193 | } | |
194 | ||
195 | static struct link_map_offsets * | |
196 | i386nto_svr4_fetch_link_map_offsets (void) | |
197 | { | |
198 | static struct link_map_offsets lmo; | |
199 | static struct link_map_offsets *lmp = NULL; | |
200 | ||
201 | if (lmp == NULL) | |
202 | { | |
203 | lmp = &lmo; | |
204 | ||
205 | lmo.r_debug_size = 8; /* The actual size is 20 bytes, but | |
206 | only 8 bytes are used. */ | |
207 | lmo.r_map_offset = 4; | |
208 | lmo.r_map_size = 4; | |
209 | ||
210 | lmo.link_map_size = 20; /* The actual size is 552 bytes, but | |
211 | only 20 bytes are used. */ | |
212 | lmo.l_addr_offset = 0; | |
213 | lmo.l_addr_size = 4; | |
214 | ||
215 | lmo.l_name_offset = 4; | |
216 | lmo.l_name_size = 4; | |
217 | ||
218 | lmo.l_next_offset = 12; | |
219 | lmo.l_next_size = 4; | |
220 | ||
221 | lmo.l_prev_offset = 16; | |
222 | lmo.l_prev_size = 4; | |
223 | } | |
224 | ||
225 | return lmp; | |
226 | } | |
227 | ||
228 | static int | |
229 | i386nto_pc_in_sigtramp (CORE_ADDR pc, char *name) | |
230 | { | |
231 | return name && strcmp ("__signalstub", name) == 0; | |
232 | } | |
233 | ||
acd5c798 MK |
234 | #define I386_NTO_SIGCONTEXT_OFFSET 136 |
235 | ||
236 | /* Assuming NEXT_FRAME is a frame following a QNX Neutrino sigtramp | |
237 | routine, return the address of the associated sigcontext structure. */ | |
238 | ||
1b883d35 | 239 | static CORE_ADDR |
acd5c798 | 240 | i386nto_sigcontext_addr (struct frame_info *next_frame) |
1b883d35 | 241 | { |
acd5c798 | 242 | char buf[4]; |
89929b45 | 243 | CORE_ADDR sp; |
acd5c798 MK |
244 | |
245 | frame_unwind_register (next_frame, SP_REGNUM, buf); | |
246 | sp = extract_unsigned_integer (buf, 4); | |
1b883d35 | 247 | |
acd5c798 | 248 | return sp + I386_NTO_SIGCONTEXT_OFFSET; |
1b883d35 KW |
249 | } |
250 | ||
251 | static void | |
47979a4b | 252 | init_i386nto_ops (void) |
1b883d35 KW |
253 | { |
254 | current_nto_target.nto_regset_id = i386nto_regset_id; | |
255 | current_nto_target.nto_supply_gregset = i386nto_supply_gregset; | |
256 | current_nto_target.nto_supply_fpregset = i386nto_supply_fpregset; | |
257 | current_nto_target.nto_supply_altregset = nto_dummy_supply_regset; | |
258 | current_nto_target.nto_supply_regset = i386nto_supply_regset; | |
259 | current_nto_target.nto_register_area = i386nto_register_area; | |
260 | current_nto_target.nto_regset_fill = i386nto_regset_fill; | |
261 | current_nto_target.nto_fetch_link_map_offsets = | |
262 | i386nto_svr4_fetch_link_map_offsets; | |
263 | } | |
264 | ||
265 | static void | |
266 | i386nto_init_abi (struct gdbarch_info info, struct gdbarch *gdbarch) | |
267 | { | |
268 | struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch); | |
269 | ||
270 | /* NTO uses ELF. */ | |
271 | i386_elf_init_abi (info, gdbarch); | |
272 | ||
273 | /* Neutrino rewinds to look more normal. */ | |
274 | set_gdbarch_decr_pc_after_break (gdbarch, 0); | |
275 | ||
276 | /* NTO has shared libraries. */ | |
277 | set_gdbarch_in_solib_call_trampoline (gdbarch, in_plt_section); | |
278 | set_gdbarch_skip_trampoline_code (gdbarch, find_solib_trampoline_target); | |
279 | ||
280 | set_gdbarch_pc_in_sigtramp (gdbarch, i386nto_pc_in_sigtramp); | |
281 | tdep->sigcontext_addr = i386nto_sigcontext_addr; | |
282 | tdep->sc_pc_offset = 56; | |
283 | tdep->sc_sp_offset = 68; | |
284 | ||
285 | /* Setjmp()'s return PC saved in EDX (5). */ | |
286 | tdep->jb_pc_offset = 20; /* 5x32 bit ints in. */ | |
287 | ||
288 | set_solib_svr4_fetch_link_map_offsets (gdbarch, | |
289 | i386nto_svr4_fetch_link_map_offsets); | |
290 | ||
291 | /* Our loader handles solib relocations slightly differently than svr4. */ | |
292 | TARGET_SO_RELOCATE_SECTION_ADDRESSES = nto_relocate_section_addresses; | |
293 | ||
294 | /* Supply a nice function to find our solibs. */ | |
295 | TARGET_SO_FIND_AND_OPEN_SOLIB = nto_find_and_open_solib; | |
296 | ||
297 | init_i386nto_ops (); | |
298 | } | |
299 | ||
300 | void | |
301 | _initialize_i386nto_tdep (void) | |
302 | { | |
303 | gdbarch_register_osabi (bfd_arch_i386, 0, GDB_OSABI_QNXNTO, | |
304 | i386nto_init_abi); | |
305 | } |