1 /* Target-dependent code for QNX Neutrino x86.
3 Copyright 2003, 2004 Free Software Foundation, Inc.
5 Contributed by QNX Software Systems Ltd.
7 This file is part of GDB.
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.
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.
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. */
24 #include "gdb_string.h"
25 #include "gdb_assert.h"
30 #include "solib-svr4.h"
31 #include "i386-tdep.h"
34 #include "i387-tdep.h"
37 #define X86_CPU_FXSR (1L << 12)
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. */
45 /* Map a GDB register number to an offset in the reg structure. */
46 static int regmap
[] = {
56 (10 * 4), /* eflags */
62 static struct nto_target_ops i386_nto_target
;
64 /* Given a gdb regno, return the offset into Neutrino's register structure
65 or -1 if register is unknown. */
67 nto_reg_offset (int regno
)
69 return (regno
>= 0 && regno
< NUM_GPREGS
) ? regmap
[regno
] : -1;
73 i386nto_supply_gregset (char *gpregs
)
78 for (regno
= 0; regno
< I386_NUM_GREGS
; regno
++)
80 int offset
= nto_reg_offset (regno
);
82 regcache_raw_supply (current_regcache
, regno
, (char *) &empty
);
84 regcache_raw_supply (current_regcache
, regno
, gpregs
+ offset
);
89 i386nto_supply_fpregset (char *fpregs
)
91 if (nto_cpuinfo_valid
&& nto_cpuinfo_flags
| X86_CPU_FXSR
)
92 i387_supply_fxsave (current_regcache
, -1, fpregs
);
94 i387_supply_fsave (current_regcache
, -1, fpregs
);
98 i386nto_supply_regset (int regset
, char *data
)
102 case NTO_REG_GENERAL
: /* QNX has different ordering of GP regs than GDB. */
103 i386nto_supply_gregset (data
);
106 i386nto_supply_fpregset (data
);
112 i386nto_regset_id (int regno
)
116 else if (regno
< I386_NUM_GREGS
)
117 return NTO_REG_GENERAL
;
118 else if (regno
< I386_NUM_GREGS
+ I386_NUM_FREGS
)
119 return NTO_REG_FLOAT
;
121 return -1; /* Error. */
125 i386nto_register_area (int regno
, int regset
, unsigned *off
)
130 if (regset
== NTO_REG_GENERAL
)
133 return NUM_GPREGS
* 4;
135 *off
= nto_reg_offset (regno
);
140 else if (regset
== NTO_REG_FLOAT
)
142 unsigned off_adjust
, regsize
, regset_size
;
144 if (nto_cpuinfo_valid
&& nto_cpuinfo_flags
| X86_CPU_FXSR
)
160 *off
= (regno
- FP0_REGNUM
) * regsize
+ off_adjust
;
162 /* Why 10 instead of regsize? GDB only stores 10 bytes per FP
163 register so if we're sending a register back to the target,
164 we only want pdebug to write 10 bytes so as not to clobber
165 the reserved 6 bytes in the fxsave structure. */
171 i386nto_regset_fill (int regset
, char *data
)
173 if (regset
== NTO_REG_GENERAL
)
177 for (regno
= 0; regno
< NUM_GPREGS
; regno
++)
179 int offset
= nto_reg_offset (regno
);
181 regcache_raw_collect (current_regcache
, regno
, data
+ offset
);
184 else if (regset
== NTO_REG_FLOAT
)
186 if (nto_cpuinfo_valid
&& nto_cpuinfo_flags
| X86_CPU_FXSR
)
187 i387_fill_fxsave (data
, -1);
189 i387_fill_fsave (data
, -1);
197 static struct link_map_offsets
*
198 i386nto_svr4_fetch_link_map_offsets (void)
200 static struct link_map_offsets lmo
;
201 static struct link_map_offsets
*lmp
= NULL
;
207 lmo
.r_debug_size
= 8; /* The actual size is 20 bytes, but
208 only 8 bytes are used. */
209 lmo
.r_map_offset
= 4;
212 lmo
.link_map_size
= 20; /* The actual size is 552 bytes, but
213 only 20 bytes are used. */
214 lmo
.l_addr_offset
= 0;
217 lmo
.l_name_offset
= 4;
220 lmo
.l_next_offset
= 12;
223 lmo
.l_prev_offset
= 16;
230 /* Return whether the frame preceding NEXT_FRAME corresponds to a QNX
231 Neutrino sigtramp routine. */
234 i386nto_sigtramp_p (struct frame_info
*next_frame
)
236 CORE_ADDR pc
= frame_pc_unwind (next_frame
);
239 find_pc_partial_function (pc
, &name
, NULL
, NULL
);
240 return name
&& strcmp ("__signalstub", name
) == 0;
243 #define I386_NTO_SIGCONTEXT_OFFSET 136
245 /* Assuming NEXT_FRAME is a frame following a QNX Neutrino sigtramp
246 routine, return the address of the associated sigcontext structure. */
249 i386nto_sigcontext_addr (struct frame_info
*next_frame
)
254 frame_unwind_register (next_frame
, I386_ESP_REGNUM
, buf
);
255 sp
= extract_unsigned_integer (buf
, 4);
257 return sp
+ I386_NTO_SIGCONTEXT_OFFSET
;
261 init_i386nto_ops (void)
263 i386_nto_target
.regset_id
= i386nto_regset_id
;
264 i386_nto_target
.supply_gregset
= i386nto_supply_gregset
;
265 i386_nto_target
.supply_fpregset
= i386nto_supply_fpregset
;
266 i386_nto_target
.supply_altregset
= nto_dummy_supply_regset
;
267 i386_nto_target
.supply_regset
= i386nto_supply_regset
;
268 i386_nto_target
.register_area
= i386nto_register_area
;
269 i386_nto_target
.regset_fill
= i386nto_regset_fill
;
270 i386_nto_target
.fetch_link_map_offsets
=
271 i386nto_svr4_fetch_link_map_offsets
;
275 i386nto_init_abi (struct gdbarch_info info
, struct gdbarch
*gdbarch
)
277 struct gdbarch_tdep
*tdep
= gdbarch_tdep (gdbarch
);
279 /* Deal with our strange signals. */
280 nto_initialize_signals ();
283 i386_elf_init_abi (info
, gdbarch
);
285 /* Neutrino rewinds to look more normal. Need to override the i386
286 default which is [unfortunately] to decrement the PC. */
287 set_gdbarch_decr_pc_after_break (gdbarch
, 0);
289 /* NTO has shared libraries. */
290 set_gdbarch_skip_trampoline_code (gdbarch
, find_solib_trampoline_target
);
292 tdep
->sigtramp_p
= i386nto_sigtramp_p
;
293 tdep
->sigcontext_addr
= i386nto_sigcontext_addr
;
294 tdep
->sc_pc_offset
= 56;
295 tdep
->sc_sp_offset
= 68;
297 /* Setjmp()'s return PC saved in EDX (5). */
298 tdep
->jb_pc_offset
= 20; /* 5x32 bit ints in. */
300 set_solib_svr4_fetch_link_map_offsets (gdbarch
,
301 i386nto_svr4_fetch_link_map_offsets
);
303 /* Our loader handles solib relocations slightly differently than svr4. */
304 TARGET_SO_RELOCATE_SECTION_ADDRESSES
= nto_relocate_section_addresses
;
306 /* Supply a nice function to find our solibs. */
307 TARGET_SO_FIND_AND_OPEN_SOLIB
= nto_find_and_open_solib
;
309 /* Our linker code is in libc. */
310 TARGET_SO_IN_DYNSYM_RESOLVE_CODE
= nto_in_dynsym_resolve_code
;
312 nto_set_target (&i386_nto_target
);
316 _initialize_i386nto_tdep (void)
319 gdbarch_register_osabi (bfd_arch_i386
, 0, GDB_OSABI_QNXNTO
,
321 gdbarch_register_osabi_sniffer (bfd_arch_i386
, bfd_target_elf_flavour
,
322 nto_elf_osabi_sniffer
);