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911bc6ee | 1 | /* Target-dependent code for QNX Neutrino x86. |
1b883d35 | 2 | |
911bc6ee | 3 | Copyright 2003, 2004 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 | |
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 | ||
f6792ef4 | 76 | for (regno = 0; regno < I386_NUM_GREGS; regno++) |
1b883d35 KW |
77 | { |
78 | int offset = nto_reg_offset (regno); | |
79 | if (offset == -1) | |
23a6d369 | 80 | regcache_raw_supply (current_regcache, regno, (char *) &empty); |
1b883d35 | 81 | else |
23a6d369 | 82 | regcache_raw_supply (current_regcache, regno, gpregs + offset); |
1b883d35 KW |
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; | |
f6792ef4 | 114 | else if (regno < I386_NUM_GREGS) |
1b883d35 | 115 | return NTO_REG_GENERAL; |
f6792ef4 | 116 | else if (regno < I386_NUM_GREGS + I386_NUM_FREGS) |
1b883d35 KW |
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) | |
822c9732 | 179 | regcache_raw_collect (current_regcache, regno, data + offset); |
1b883d35 KW |
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 | ||
911bc6ee MK |
228 | /* Return whether the frame preceding NEXT_FRAME corresponds to a QNX |
229 | Neutrino sigtramp routine. */ | |
230 | ||
1b883d35 | 231 | static int |
911bc6ee | 232 | i386nto_sigtramp_p (struct frame_info *next_frame) |
1b883d35 | 233 | { |
911bc6ee MK |
234 | CORE_ADDR pc = frame_pc_unwind (next_frame); |
235 | char *name; | |
236 | ||
237 | find_pc_partial_function (pc, &name, NULL, NULL); | |
1b883d35 KW |
238 | return name && strcmp ("__signalstub", name) == 0; |
239 | } | |
240 | ||
acd5c798 MK |
241 | #define I386_NTO_SIGCONTEXT_OFFSET 136 |
242 | ||
243 | /* Assuming NEXT_FRAME is a frame following a QNX Neutrino sigtramp | |
244 | routine, return the address of the associated sigcontext structure. */ | |
245 | ||
1b883d35 | 246 | static CORE_ADDR |
acd5c798 | 247 | i386nto_sigcontext_addr (struct frame_info *next_frame) |
1b883d35 | 248 | { |
acd5c798 | 249 | char buf[4]; |
89929b45 | 250 | CORE_ADDR sp; |
acd5c798 | 251 | |
911bc6ee | 252 | frame_unwind_register (next_frame, I386_ESP_REGNUM, buf); |
acd5c798 | 253 | sp = extract_unsigned_integer (buf, 4); |
1b883d35 | 254 | |
acd5c798 | 255 | return sp + I386_NTO_SIGCONTEXT_OFFSET; |
1b883d35 KW |
256 | } |
257 | ||
258 | static void | |
47979a4b | 259 | init_i386nto_ops (void) |
1b883d35 KW |
260 | { |
261 | current_nto_target.nto_regset_id = i386nto_regset_id; | |
262 | current_nto_target.nto_supply_gregset = i386nto_supply_gregset; | |
263 | current_nto_target.nto_supply_fpregset = i386nto_supply_fpregset; | |
264 | current_nto_target.nto_supply_altregset = nto_dummy_supply_regset; | |
265 | current_nto_target.nto_supply_regset = i386nto_supply_regset; | |
266 | current_nto_target.nto_register_area = i386nto_register_area; | |
267 | current_nto_target.nto_regset_fill = i386nto_regset_fill; | |
268 | current_nto_target.nto_fetch_link_map_offsets = | |
269 | i386nto_svr4_fetch_link_map_offsets; | |
270 | } | |
271 | ||
272 | static void | |
273 | i386nto_init_abi (struct gdbarch_info info, struct gdbarch *gdbarch) | |
274 | { | |
275 | struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch); | |
276 | ||
277 | /* NTO uses ELF. */ | |
278 | i386_elf_init_abi (info, gdbarch); | |
279 | ||
71bd6bd4 | 280 | /* Neutrino rewinds to look more normal. Need to override the i386 |
d3efc286 | 281 | default which is [unfortunately] to decrement the PC. */ |
1b883d35 KW |
282 | set_gdbarch_decr_pc_after_break (gdbarch, 0); |
283 | ||
284 | /* NTO has shared libraries. */ | |
1b883d35 KW |
285 | set_gdbarch_skip_trampoline_code (gdbarch, find_solib_trampoline_target); |
286 | ||
911bc6ee | 287 | tdep->sigtramp_p = i386nto_sigtramp_p; |
1b883d35 KW |
288 | tdep->sigcontext_addr = i386nto_sigcontext_addr; |
289 | tdep->sc_pc_offset = 56; | |
290 | tdep->sc_sp_offset = 68; | |
291 | ||
292 | /* Setjmp()'s return PC saved in EDX (5). */ | |
293 | tdep->jb_pc_offset = 20; /* 5x32 bit ints in. */ | |
294 | ||
295 | set_solib_svr4_fetch_link_map_offsets (gdbarch, | |
296 | i386nto_svr4_fetch_link_map_offsets); | |
297 | ||
298 | /* Our loader handles solib relocations slightly differently than svr4. */ | |
299 | TARGET_SO_RELOCATE_SECTION_ADDRESSES = nto_relocate_section_addresses; | |
300 | ||
301 | /* Supply a nice function to find our solibs. */ | |
302 | TARGET_SO_FIND_AND_OPEN_SOLIB = nto_find_and_open_solib; | |
303 | ||
304 | init_i386nto_ops (); | |
305 | } | |
306 | ||
307 | void | |
308 | _initialize_i386nto_tdep (void) | |
309 | { | |
310 | gdbarch_register_osabi (bfd_arch_i386, 0, GDB_OSABI_QNXNTO, | |
311 | i386nto_init_abi); | |
312 | } |