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911bc6ee | 1 | /* Target-dependent code for QNX Neutrino x86. |
1b883d35 | 2 | |
6aba47ca | 3 | Copyright (C) 2003, 2004, 2007 Free Software Foundation, Inc. |
1b883d35 KW |
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 | |
197e01b6 EZ |
21 | Foundation, Inc., 51 Franklin Street, Fifth Floor, |
22 | Boston, MA 02110-1301, USA. */ | |
1b883d35 | 23 | |
1b883d35 KW |
24 | #include "defs.h" |
25 | #include "frame.h" | |
17ca283a | 26 | #include "osabi.h" |
1b883d35 | 27 | #include "regcache.h" |
17ca283a MK |
28 | #include "target.h" |
29 | ||
30 | #include "gdb_assert.h" | |
31 | #include "gdb_string.h" | |
32 | ||
1b883d35 | 33 | #include "i386-tdep.h" |
1b883d35 | 34 | #include "i387-tdep.h" |
17ca283a MK |
35 | #include "nto-tdep.h" |
36 | #include "solib-svr4.h" | |
1b883d35 | 37 | |
3d171c85 MK |
38 | /* Target vector for QNX NTO x86. */ |
39 | static struct nto_target_ops i386_nto_target; | |
40 | ||
1b883d35 KW |
41 | #ifndef X86_CPU_FXSR |
42 | #define X86_CPU_FXSR (1L << 12) | |
43 | #endif | |
44 | ||
45 | /* Why 13? Look in our /usr/include/x86/context.h header at the | |
46 | x86_cpu_registers structure and you'll see an 'exx' junk register | |
47 | that is just filler. Don't ask me, ask the kernel guys. */ | |
48 | #define NUM_GPREGS 13 | |
49 | ||
3d171c85 MK |
50 | /* Mapping between the general-purpose registers in `struct xxx' |
51 | format and GDB's register cache layout. */ | |
52 | ||
53 | /* From <x86/context.h>. */ | |
54 | static int i386nto_gregset_reg_offset[] = | |
55 | { | |
56 | 7 * 4, /* %eax */ | |
57 | 6 * 4, /* %ecx */ | |
58 | 5 * 4, /* %edx */ | |
59 | 4 * 4, /* %ebx */ | |
60 | 11 * 4, /* %esp */ | |
61 | 2 * 4, /* %epb */ | |
62 | 1 * 4, /* %esi */ | |
63 | 0 * 4, /* %edi */ | |
64 | 8 * 4, /* %eip */ | |
65 | 10 * 4, /* %eflags */ | |
66 | 9 * 4, /* %cs */ | |
67 | 12 * 4, /* %ss */ | |
68 | -1 /* filler */ | |
1b883d35 KW |
69 | }; |
70 | ||
3d171c85 MK |
71 | /* Given a GDB register number REGNUM, return the offset into |
72 | Neutrino's register structure or -1 if the register is unknown. */ | |
d737fd7f | 73 | |
1b883d35 | 74 | static int |
3d171c85 | 75 | nto_reg_offset (int regnum) |
1b883d35 | 76 | { |
3d171c85 MK |
77 | if (regnum >= 0 && regnum < ARRAY_SIZE (i386nto_gregset_reg_offset)) |
78 | return i386nto_gregset_reg_offset[regnum]; | |
79 | ||
80 | return -1; | |
1b883d35 KW |
81 | } |
82 | ||
83 | static void | |
84 | i386nto_supply_gregset (char *gpregs) | |
85 | { | |
3d171c85 | 86 | struct gdbarch_tdep *tdep = gdbarch_tdep (current_gdbarch); |
1b883d35 | 87 | |
3d171c85 MK |
88 | if(tdep->gregset == NULL) |
89 | tdep->gregset = regset_alloc (current_gdbarch, i386_supply_gregset, | |
90 | i386_collect_gregset); | |
91 | ||
92 | gdb_assert (tdep->gregset_reg_offset == i386nto_gregset_reg_offset); | |
93 | tdep->gregset->supply_regset (tdep->gregset, current_regcache, -1, | |
94 | gpregs, NUM_GPREGS * 4); | |
1b883d35 KW |
95 | } |
96 | ||
97 | static void | |
98 | i386nto_supply_fpregset (char *fpregs) | |
99 | { | |
100 | if (nto_cpuinfo_valid && nto_cpuinfo_flags | X86_CPU_FXSR) | |
41d041d6 | 101 | i387_supply_fxsave (current_regcache, -1, fpregs); |
1b883d35 | 102 | else |
41d041d6 | 103 | i387_supply_fsave (current_regcache, -1, fpregs); |
1b883d35 KW |
104 | } |
105 | ||
106 | static void | |
107 | i386nto_supply_regset (int regset, char *data) | |
108 | { | |
109 | switch (regset) | |
110 | { | |
3d171c85 | 111 | case NTO_REG_GENERAL: |
1b883d35 KW |
112 | i386nto_supply_gregset (data); |
113 | break; | |
114 | case NTO_REG_FLOAT: | |
115 | i386nto_supply_fpregset (data); | |
116 | break; | |
117 | } | |
118 | } | |
119 | ||
120 | static int | |
121 | i386nto_regset_id (int regno) | |
122 | { | |
123 | if (regno == -1) | |
124 | return NTO_REG_END; | |
f6792ef4 | 125 | else if (regno < I386_NUM_GREGS) |
1b883d35 | 126 | return NTO_REG_GENERAL; |
f6792ef4 | 127 | else if (regno < I386_NUM_GREGS + I386_NUM_FREGS) |
1b883d35 KW |
128 | return NTO_REG_FLOAT; |
129 | ||
130 | return -1; /* Error. */ | |
131 | } | |
132 | ||
133 | static int | |
134 | i386nto_register_area (int regno, int regset, unsigned *off) | |
135 | { | |
136 | int len; | |
137 | ||
138 | *off = 0; | |
139 | if (regset == NTO_REG_GENERAL) | |
140 | { | |
141 | if (regno == -1) | |
142 | return NUM_GPREGS * 4; | |
143 | ||
144 | *off = nto_reg_offset (regno); | |
145 | if (*off == -1) | |
146 | return 0; | |
147 | return 4; | |
148 | } | |
149 | else if (regset == NTO_REG_FLOAT) | |
150 | { | |
151 | unsigned off_adjust, regsize, regset_size; | |
152 | ||
153 | if (nto_cpuinfo_valid && nto_cpuinfo_flags | X86_CPU_FXSR) | |
154 | { | |
155 | off_adjust = 32; | |
156 | regsize = 16; | |
157 | regset_size = 512; | |
158 | } | |
159 | else | |
160 | { | |
161 | off_adjust = 28; | |
162 | regsize = 10; | |
163 | regset_size = 128; | |
164 | } | |
165 | ||
166 | if (regno == -1) | |
167 | return regset_size; | |
168 | ||
169 | *off = (regno - FP0_REGNUM) * regsize + off_adjust; | |
170 | return 10; | |
171 | /* Why 10 instead of regsize? GDB only stores 10 bytes per FP | |
172 | register so if we're sending a register back to the target, | |
173 | we only want pdebug to write 10 bytes so as not to clobber | |
174 | the reserved 6 bytes in the fxsave structure. */ | |
175 | } | |
176 | return -1; | |
177 | } | |
178 | ||
179 | static int | |
180 | i386nto_regset_fill (int regset, char *data) | |
181 | { | |
182 | if (regset == NTO_REG_GENERAL) | |
183 | { | |
184 | int regno; | |
185 | ||
186 | for (regno = 0; regno < NUM_GPREGS; regno++) | |
187 | { | |
188 | int offset = nto_reg_offset (regno); | |
189 | if (offset != -1) | |
822c9732 | 190 | regcache_raw_collect (current_regcache, regno, data + offset); |
1b883d35 KW |
191 | } |
192 | } | |
193 | else if (regset == NTO_REG_FLOAT) | |
194 | { | |
195 | if (nto_cpuinfo_valid && nto_cpuinfo_flags | X86_CPU_FXSR) | |
196 | i387_fill_fxsave (data, -1); | |
197 | else | |
198 | i387_fill_fsave (data, -1); | |
199 | } | |
200 | else | |
201 | return -1; | |
202 | ||
203 | return 0; | |
204 | } | |
205 | ||
911bc6ee MK |
206 | /* Return whether the frame preceding NEXT_FRAME corresponds to a QNX |
207 | Neutrino sigtramp routine. */ | |
208 | ||
1b883d35 | 209 | static int |
911bc6ee | 210 | i386nto_sigtramp_p (struct frame_info *next_frame) |
1b883d35 | 211 | { |
911bc6ee MK |
212 | CORE_ADDR pc = frame_pc_unwind (next_frame); |
213 | char *name; | |
214 | ||
215 | find_pc_partial_function (pc, &name, NULL, NULL); | |
1b883d35 KW |
216 | return name && strcmp ("__signalstub", name) == 0; |
217 | } | |
218 | ||
acd5c798 MK |
219 | #define I386_NTO_SIGCONTEXT_OFFSET 136 |
220 | ||
221 | /* Assuming NEXT_FRAME is a frame following a QNX Neutrino sigtramp | |
222 | routine, return the address of the associated sigcontext structure. */ | |
223 | ||
1b883d35 | 224 | static CORE_ADDR |
acd5c798 | 225 | i386nto_sigcontext_addr (struct frame_info *next_frame) |
1b883d35 | 226 | { |
acd5c798 | 227 | char buf[4]; |
89929b45 | 228 | CORE_ADDR sp; |
acd5c798 | 229 | |
911bc6ee | 230 | frame_unwind_register (next_frame, I386_ESP_REGNUM, buf); |
acd5c798 | 231 | sp = extract_unsigned_integer (buf, 4); |
1b883d35 | 232 | |
acd5c798 | 233 | return sp + I386_NTO_SIGCONTEXT_OFFSET; |
1b883d35 KW |
234 | } |
235 | ||
236 | static void | |
47979a4b | 237 | init_i386nto_ops (void) |
1b883d35 | 238 | { |
d737fd7f KW |
239 | i386_nto_target.regset_id = i386nto_regset_id; |
240 | i386_nto_target.supply_gregset = i386nto_supply_gregset; | |
241 | i386_nto_target.supply_fpregset = i386nto_supply_fpregset; | |
242 | i386_nto_target.supply_altregset = nto_dummy_supply_regset; | |
243 | i386_nto_target.supply_regset = i386nto_supply_regset; | |
244 | i386_nto_target.register_area = i386nto_register_area; | |
245 | i386_nto_target.regset_fill = i386nto_regset_fill; | |
246 | i386_nto_target.fetch_link_map_offsets = | |
17ca283a | 247 | svr4_ilp32_fetch_link_map_offsets; |
1b883d35 KW |
248 | } |
249 | ||
250 | static void | |
251 | i386nto_init_abi (struct gdbarch_info info, struct gdbarch *gdbarch) | |
252 | { | |
253 | struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch); | |
254 | ||
d737fd7f KW |
255 | /* Deal with our strange signals. */ |
256 | nto_initialize_signals (); | |
257 | ||
1b883d35 KW |
258 | /* NTO uses ELF. */ |
259 | i386_elf_init_abi (info, gdbarch); | |
260 | ||
71bd6bd4 | 261 | /* Neutrino rewinds to look more normal. Need to override the i386 |
d3efc286 | 262 | default which is [unfortunately] to decrement the PC. */ |
1b883d35 KW |
263 | set_gdbarch_decr_pc_after_break (gdbarch, 0); |
264 | ||
3d171c85 MK |
265 | tdep->gregset_reg_offset = i386nto_gregset_reg_offset; |
266 | tdep->gregset_num_regs = ARRAY_SIZE (i386nto_gregset_reg_offset); | |
267 | tdep->sizeof_gregset = NUM_GPREGS * 4; | |
268 | ||
911bc6ee | 269 | tdep->sigtramp_p = i386nto_sigtramp_p; |
1b883d35 KW |
270 | tdep->sigcontext_addr = i386nto_sigcontext_addr; |
271 | tdep->sc_pc_offset = 56; | |
272 | tdep->sc_sp_offset = 68; | |
273 | ||
274 | /* Setjmp()'s return PC saved in EDX (5). */ | |
275 | tdep->jb_pc_offset = 20; /* 5x32 bit ints in. */ | |
276 | ||
17ca283a MK |
277 | set_solib_svr4_fetch_link_map_offsets |
278 | (gdbarch, svr4_ilp32_fetch_link_map_offsets); | |
1b883d35 KW |
279 | |
280 | /* Our loader handles solib relocations slightly differently than svr4. */ | |
281 | TARGET_SO_RELOCATE_SECTION_ADDRESSES = nto_relocate_section_addresses; | |
282 | ||
283 | /* Supply a nice function to find our solibs. */ | |
284 | TARGET_SO_FIND_AND_OPEN_SOLIB = nto_find_and_open_solib; | |
285 | ||
d737fd7f KW |
286 | /* Our linker code is in libc. */ |
287 | TARGET_SO_IN_DYNSYM_RESOLVE_CODE = nto_in_dynsym_resolve_code; | |
288 | ||
289 | nto_set_target (&i386_nto_target); | |
1b883d35 KW |
290 | } |
291 | ||
292 | void | |
293 | _initialize_i386nto_tdep (void) | |
294 | { | |
d737fd7f | 295 | init_i386nto_ops (); |
1b883d35 KW |
296 | gdbarch_register_osabi (bfd_arch_i386, 0, GDB_OSABI_QNXNTO, |
297 | i386nto_init_abi); | |
d737fd7f KW |
298 | gdbarch_register_osabi_sniffer (bfd_arch_i386, bfd_target_elf_flavour, |
299 | nto_elf_osabi_sniffer); | |
1b883d35 | 300 | } |