1 /* Target-dependent code for QNX Neutrino x86.
3 Copyright (C) 2003-2014 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 3 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, see <http://www.gnu.org/licenses/>. */
30 #include "i386-tdep.h"
31 #include "i387-tdep.h"
34 #include "solib-svr4.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 /* Mapping between the general-purpose registers in `struct xxx'
46 format and GDB's register cache layout. */
48 /* From <x86/context.h>. */
49 static int i386nto_gregset_reg_offset
[] =
66 /* Given a GDB register number REGNUM, return the offset into
67 Neutrino's register structure or -1 if the register is unknown. */
70 nto_reg_offset (int regnum
)
72 if (regnum
>= 0 && regnum
< ARRAY_SIZE (i386nto_gregset_reg_offset
))
73 return i386nto_gregset_reg_offset
[regnum
];
79 i386nto_supply_gregset (struct regcache
*regcache
, char *gpregs
)
81 struct gdbarch
*gdbarch
= get_regcache_arch (regcache
);
82 struct gdbarch_tdep
*tdep
= gdbarch_tdep (gdbarch
);
84 gdb_assert (tdep
->gregset_reg_offset
== i386nto_gregset_reg_offset
);
85 i386_gregset
.supply_regset (&i386_gregset
, regcache
, -1,
86 gpregs
, NUM_GPREGS
* 4);
90 i386nto_supply_fpregset (struct regcache
*regcache
, char *fpregs
)
92 if (nto_cpuinfo_valid
&& nto_cpuinfo_flags
| X86_CPU_FXSR
)
93 i387_supply_fxsave (regcache
, -1, fpregs
);
95 i387_supply_fsave (regcache
, -1, fpregs
);
99 i386nto_supply_regset (struct regcache
*regcache
, int regset
, char *data
)
103 case NTO_REG_GENERAL
:
104 i386nto_supply_gregset (regcache
, data
);
107 i386nto_supply_fpregset (regcache
, data
);
113 i386nto_regset_id (int regno
)
117 else if (regno
< I386_NUM_GREGS
)
118 return NTO_REG_GENERAL
;
119 else if (regno
< I386_NUM_GREGS
+ I387_NUM_REGS
)
120 return NTO_REG_FLOAT
;
121 else if (regno
< I386_SSE_NUM_REGS
)
122 return NTO_REG_FLOAT
; /* We store xmm registers in fxsave_area. */
124 return -1; /* Error. */
128 i386nto_register_area (struct gdbarch
*gdbarch
,
129 int regno
, int regset
, unsigned *off
)
131 struct gdbarch_tdep
*tdep
= gdbarch_tdep (gdbarch
);
134 if (regset
== NTO_REG_GENERAL
)
137 return NUM_GPREGS
* 4;
139 *off
= nto_reg_offset (regno
);
144 else if (regset
== NTO_REG_FLOAT
)
146 unsigned off_adjust
, regsize
, regset_size
, regno_base
;
147 /* The following are flags indicating number in our fxsave_area. */
148 int first_four
= (regno
>= I387_FCTRL_REGNUM (tdep
)
149 && regno
<= I387_FISEG_REGNUM (tdep
));
150 int second_four
= (regno
> I387_FISEG_REGNUM (tdep
)
151 && regno
<= I387_FOP_REGNUM (tdep
));
152 int st_reg
= (regno
>= I387_ST0_REGNUM (tdep
)
153 && regno
< I387_ST0_REGNUM (tdep
) + 8);
154 int xmm_reg
= (regno
>= I387_XMM0_REGNUM (tdep
)
155 && regno
< I387_MXCSR_REGNUM (tdep
));
157 if (nto_cpuinfo_valid
&& nto_cpuinfo_flags
| X86_CPU_FXSR
)
162 /* fxsave_area structure. */
165 /* fpu_control_word, fpu_status_word, fpu_tag_word, fpu_operand
167 regsize
= 2; /* Two bytes each. */
169 regno_base
= I387_FCTRL_REGNUM (tdep
);
171 else if (second_four
)
173 /* fpu_ip, fpu_cs, fpu_op, fpu_ds registers. */
176 regno_base
= I387_FISEG_REGNUM (tdep
) + 1;
183 regno_base
= I387_ST0_REGNUM (tdep
);
190 regno_base
= I387_XMM0_REGNUM (tdep
);
192 else if (regno
== I387_MXCSR_REGNUM (tdep
))
196 regno_base
= I387_MXCSR_REGNUM (tdep
);
201 gdb_assert (regno
== -1);
204 regsize
= regset_size
;
210 /* fsave_area structure. */
211 if (first_four
|| second_four
)
213 /* fpu_control_word, ... , fpu_ds registers. */
216 regno_base
= I387_FCTRL_REGNUM (tdep
);
220 /* One of ST registers. */
223 regno_base
= I387_ST0_REGNUM (tdep
);
228 gdb_assert (regno
== -1);
231 regsize
= regset_size
;
236 *off
= off_adjust
+ (regno
- regno_base
) * regsize
;
245 i386nto_regset_fill (const struct regcache
*regcache
, int regset
, char *data
)
247 if (regset
== NTO_REG_GENERAL
)
251 for (regno
= 0; regno
< NUM_GPREGS
; regno
++)
253 int offset
= nto_reg_offset (regno
);
255 regcache_raw_collect (regcache
, regno
, data
+ offset
);
258 else if (regset
== NTO_REG_FLOAT
)
260 if (nto_cpuinfo_valid
&& nto_cpuinfo_flags
| X86_CPU_FXSR
)
261 i387_collect_fxsave (regcache
, -1, data
);
263 i387_collect_fsave (regcache
, -1, data
);
271 /* Return whether THIS_FRAME corresponds to a QNX Neutrino sigtramp
275 i386nto_sigtramp_p (struct frame_info
*this_frame
)
277 CORE_ADDR pc
= get_frame_pc (this_frame
);
280 find_pc_partial_function (pc
, &name
, NULL
, NULL
);
281 return name
&& strcmp ("__signalstub", name
) == 0;
284 /* Assuming THIS_FRAME is a QNX Neutrino sigtramp routine, return the
285 address of the associated sigcontext structure. */
288 i386nto_sigcontext_addr (struct frame_info
*this_frame
)
290 struct gdbarch
*gdbarch
= get_frame_arch (this_frame
);
291 enum bfd_endian byte_order
= gdbarch_byte_order (gdbarch
);
295 /* We store __ucontext_t addr in EDI register. */
296 get_frame_register (this_frame
, I386_EDI_REGNUM
, buf
);
297 ptrctx
= extract_unsigned_integer (buf
, 4, byte_order
);
298 ptrctx
+= 24 /* Context pointer is at this offset. */;
304 init_i386nto_ops (void)
306 nto_regset_id
= i386nto_regset_id
;
307 nto_supply_gregset
= i386nto_supply_gregset
;
308 nto_supply_fpregset
= i386nto_supply_fpregset
;
309 nto_supply_altregset
= nto_dummy_supply_regset
;
310 nto_supply_regset
= i386nto_supply_regset
;
311 nto_register_area
= i386nto_register_area
;
312 nto_regset_fill
= i386nto_regset_fill
;
313 nto_fetch_link_map_offsets
=
314 svr4_ilp32_fetch_link_map_offsets
;
318 i386nto_init_abi (struct gdbarch_info info
, struct gdbarch
*gdbarch
)
320 struct gdbarch_tdep
*tdep
= gdbarch_tdep (gdbarch
);
321 static struct target_so_ops nto_svr4_so_ops
;
323 /* Deal with our strange signals. */
324 nto_initialize_signals ();
327 i386_elf_init_abi (info
, gdbarch
);
329 /* Neutrino rewinds to look more normal. Need to override the i386
330 default which is [unfortunately] to decrement the PC. */
331 set_gdbarch_decr_pc_after_break (gdbarch
, 0);
333 tdep
->gregset_reg_offset
= i386nto_gregset_reg_offset
;
334 tdep
->gregset_num_regs
= ARRAY_SIZE (i386nto_gregset_reg_offset
);
335 tdep
->sizeof_gregset
= NUM_GPREGS
* 4;
337 tdep
->sigtramp_p
= i386nto_sigtramp_p
;
338 tdep
->sigcontext_addr
= i386nto_sigcontext_addr
;
339 tdep
->sc_reg_offset
= i386nto_gregset_reg_offset
;
340 tdep
->sc_num_regs
= ARRAY_SIZE (i386nto_gregset_reg_offset
);
342 /* Setjmp()'s return PC saved in EDX (5). */
343 tdep
->jb_pc_offset
= 20; /* 5x32 bit ints in. */
345 set_solib_svr4_fetch_link_map_offsets
346 (gdbarch
, svr4_ilp32_fetch_link_map_offsets
);
348 /* Initialize this lazily, to avoid an initialization order
349 dependency on solib-svr4.c's _initialize routine. */
350 if (nto_svr4_so_ops
.in_dynsym_resolve_code
== NULL
)
352 nto_svr4_so_ops
= svr4_so_ops
;
354 /* Our loader handles solib relocations differently than svr4. */
355 nto_svr4_so_ops
.relocate_section_addresses
356 = nto_relocate_section_addresses
;
358 /* Supply a nice function to find our solibs. */
359 nto_svr4_so_ops
.find_and_open_solib
360 = nto_find_and_open_solib
;
362 /* Our linker code is in libc. */
363 nto_svr4_so_ops
.in_dynsym_resolve_code
364 = nto_in_dynsym_resolve_code
;
366 set_solib_ops (gdbarch
, &nto_svr4_so_ops
);
369 /* Provide a prototype to silence -Wmissing-prototypes. */
370 extern initialize_file_ftype _initialize_i386nto_tdep
;
373 _initialize_i386nto_tdep (void)
376 gdbarch_register_osabi (bfd_arch_i386
, 0, GDB_OSABI_QNXNTO
,
378 gdbarch_register_osabi_sniffer (bfd_arch_i386
, bfd_target_elf_flavour
,
379 nto_elf_osabi_sniffer
);