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/>. */
28 #include "gdb_assert.h"
31 #include "i386-tdep.h"
32 #include "i387-tdep.h"
35 #include "solib-svr4.h"
38 #define X86_CPU_FXSR (1L << 12)
41 /* Why 13? Look in our /usr/include/x86/context.h header at the
42 x86_cpu_registers structure and you'll see an 'exx' junk register
43 that is just filler. Don't ask me, ask the kernel guys. */
46 /* Mapping between the general-purpose registers in `struct xxx'
47 format and GDB's register cache layout. */
49 /* From <x86/context.h>. */
50 static int i386nto_gregset_reg_offset
[] =
67 /* Given a GDB register number REGNUM, return the offset into
68 Neutrino's register structure or -1 if the register is unknown. */
71 nto_reg_offset (int regnum
)
73 if (regnum
>= 0 && regnum
< ARRAY_SIZE (i386nto_gregset_reg_offset
))
74 return i386nto_gregset_reg_offset
[regnum
];
80 i386nto_supply_gregset (struct regcache
*regcache
, char *gpregs
)
82 struct gdbarch
*gdbarch
= get_regcache_arch (regcache
);
83 struct gdbarch_tdep
*tdep
= gdbarch_tdep (gdbarch
);
85 if(tdep
->gregset
== NULL
)
86 tdep
->gregset
= regset_alloc (gdbarch
, i386_supply_gregset
,
87 i386_collect_gregset
);
89 gdb_assert (tdep
->gregset_reg_offset
== i386nto_gregset_reg_offset
);
90 tdep
->gregset
->supply_regset (tdep
->gregset
, regcache
, -1,
91 gpregs
, NUM_GPREGS
* 4);
95 i386nto_supply_fpregset (struct regcache
*regcache
, char *fpregs
)
97 if (nto_cpuinfo_valid
&& nto_cpuinfo_flags
| X86_CPU_FXSR
)
98 i387_supply_fxsave (regcache
, -1, fpregs
);
100 i387_supply_fsave (regcache
, -1, fpregs
);
104 i386nto_supply_regset (struct regcache
*regcache
, int regset
, char *data
)
108 case NTO_REG_GENERAL
:
109 i386nto_supply_gregset (regcache
, data
);
112 i386nto_supply_fpregset (regcache
, data
);
118 i386nto_regset_id (int regno
)
122 else if (regno
< I386_NUM_GREGS
)
123 return NTO_REG_GENERAL
;
124 else if (regno
< I386_NUM_GREGS
+ I387_NUM_REGS
)
125 return NTO_REG_FLOAT
;
126 else if (regno
< I386_SSE_NUM_REGS
)
127 return NTO_REG_FLOAT
; /* We store xmm registers in fxsave_area. */
129 return -1; /* Error. */
133 i386nto_register_area (struct gdbarch
*gdbarch
,
134 int regno
, int regset
, unsigned *off
)
136 struct gdbarch_tdep
*tdep
= gdbarch_tdep (gdbarch
);
139 if (regset
== NTO_REG_GENERAL
)
142 return NUM_GPREGS
* 4;
144 *off
= nto_reg_offset (regno
);
149 else if (regset
== NTO_REG_FLOAT
)
151 unsigned off_adjust
, regsize
, regset_size
, regno_base
;
152 /* The following are flags indicating number in our fxsave_area. */
153 int first_four
= (regno
>= I387_FCTRL_REGNUM (tdep
)
154 && regno
<= I387_FISEG_REGNUM (tdep
));
155 int second_four
= (regno
> I387_FISEG_REGNUM (tdep
)
156 && regno
<= I387_FOP_REGNUM (tdep
));
157 int st_reg
= (regno
>= I387_ST0_REGNUM (tdep
)
158 && regno
< I387_ST0_REGNUM (tdep
) + 8);
159 int xmm_reg
= (regno
>= I387_XMM0_REGNUM (tdep
)
160 && regno
< I387_MXCSR_REGNUM (tdep
));
162 if (nto_cpuinfo_valid
&& nto_cpuinfo_flags
| X86_CPU_FXSR
)
167 /* fxsave_area structure. */
170 /* fpu_control_word, fpu_status_word, fpu_tag_word, fpu_operand
172 regsize
= 2; /* Two bytes each. */
174 regno_base
= I387_FCTRL_REGNUM (tdep
);
176 else if (second_four
)
178 /* fpu_ip, fpu_cs, fpu_op, fpu_ds registers. */
181 regno_base
= I387_FISEG_REGNUM (tdep
) + 1;
188 regno_base
= I387_ST0_REGNUM (tdep
);
195 regno_base
= I387_XMM0_REGNUM (tdep
);
197 else if (regno
== I387_MXCSR_REGNUM (tdep
))
201 regno_base
= I387_MXCSR_REGNUM (tdep
);
206 gdb_assert (regno
== -1);
209 regsize
= regset_size
;
215 /* fsave_area structure. */
216 if (first_four
|| second_four
)
218 /* fpu_control_word, ... , fpu_ds registers. */
221 regno_base
= I387_FCTRL_REGNUM (tdep
);
225 /* One of ST registers. */
228 regno_base
= I387_ST0_REGNUM (tdep
);
233 gdb_assert (regno
== -1);
236 regsize
= regset_size
;
241 *off
= off_adjust
+ (regno
- regno_base
) * regsize
;
250 i386nto_regset_fill (const struct regcache
*regcache
, int regset
, char *data
)
252 if (regset
== NTO_REG_GENERAL
)
256 for (regno
= 0; regno
< NUM_GPREGS
; regno
++)
258 int offset
= nto_reg_offset (regno
);
260 regcache_raw_collect (regcache
, regno
, data
+ offset
);
263 else if (regset
== NTO_REG_FLOAT
)
265 if (nto_cpuinfo_valid
&& nto_cpuinfo_flags
| X86_CPU_FXSR
)
266 i387_collect_fxsave (regcache
, -1, data
);
268 i387_collect_fsave (regcache
, -1, data
);
276 /* Return whether THIS_FRAME corresponds to a QNX Neutrino sigtramp
280 i386nto_sigtramp_p (struct frame_info
*this_frame
)
282 CORE_ADDR pc
= get_frame_pc (this_frame
);
285 find_pc_partial_function (pc
, &name
, NULL
, NULL
);
286 return name
&& strcmp ("__signalstub", name
) == 0;
289 /* Assuming THIS_FRAME is a QNX Neutrino sigtramp routine, return the
290 address of the associated sigcontext structure. */
293 i386nto_sigcontext_addr (struct frame_info
*this_frame
)
295 struct gdbarch
*gdbarch
= get_frame_arch (this_frame
);
296 enum bfd_endian byte_order
= gdbarch_byte_order (gdbarch
);
300 /* We store __ucontext_t addr in EDI register. */
301 get_frame_register (this_frame
, I386_EDI_REGNUM
, buf
);
302 ptrctx
= extract_unsigned_integer (buf
, 4, byte_order
);
303 ptrctx
+= 24 /* Context pointer is at this offset. */;
309 init_i386nto_ops (void)
311 nto_regset_id
= i386nto_regset_id
;
312 nto_supply_gregset
= i386nto_supply_gregset
;
313 nto_supply_fpregset
= i386nto_supply_fpregset
;
314 nto_supply_altregset
= nto_dummy_supply_regset
;
315 nto_supply_regset
= i386nto_supply_regset
;
316 nto_register_area
= i386nto_register_area
;
317 nto_regset_fill
= i386nto_regset_fill
;
318 nto_fetch_link_map_offsets
=
319 svr4_ilp32_fetch_link_map_offsets
;
323 i386nto_init_abi (struct gdbarch_info info
, struct gdbarch
*gdbarch
)
325 struct gdbarch_tdep
*tdep
= gdbarch_tdep (gdbarch
);
326 static struct target_so_ops nto_svr4_so_ops
;
328 /* Deal with our strange signals. */
329 nto_initialize_signals ();
332 i386_elf_init_abi (info
, gdbarch
);
334 /* Neutrino rewinds to look more normal. Need to override the i386
335 default which is [unfortunately] to decrement the PC. */
336 set_gdbarch_decr_pc_after_break (gdbarch
, 0);
338 tdep
->gregset_reg_offset
= i386nto_gregset_reg_offset
;
339 tdep
->gregset_num_regs
= ARRAY_SIZE (i386nto_gregset_reg_offset
);
340 tdep
->sizeof_gregset
= NUM_GPREGS
* 4;
342 tdep
->sigtramp_p
= i386nto_sigtramp_p
;
343 tdep
->sigcontext_addr
= i386nto_sigcontext_addr
;
344 tdep
->sc_reg_offset
= i386nto_gregset_reg_offset
;
345 tdep
->sc_num_regs
= ARRAY_SIZE (i386nto_gregset_reg_offset
);
347 /* Setjmp()'s return PC saved in EDX (5). */
348 tdep
->jb_pc_offset
= 20; /* 5x32 bit ints in. */
350 set_solib_svr4_fetch_link_map_offsets
351 (gdbarch
, svr4_ilp32_fetch_link_map_offsets
);
353 /* Initialize this lazily, to avoid an initialization order
354 dependency on solib-svr4.c's _initialize routine. */
355 if (nto_svr4_so_ops
.in_dynsym_resolve_code
== NULL
)
357 nto_svr4_so_ops
= svr4_so_ops
;
359 /* Our loader handles solib relocations differently than svr4. */
360 nto_svr4_so_ops
.relocate_section_addresses
361 = nto_relocate_section_addresses
;
363 /* Supply a nice function to find our solibs. */
364 nto_svr4_so_ops
.find_and_open_solib
365 = nto_find_and_open_solib
;
367 /* Our linker code is in libc. */
368 nto_svr4_so_ops
.in_dynsym_resolve_code
369 = nto_in_dynsym_resolve_code
;
371 set_solib_ops (gdbarch
, &nto_svr4_so_ops
);
374 /* Provide a prototype to silence -Wmissing-prototypes. */
375 extern initialize_file_ftype _initialize_i386nto_tdep
;
378 _initialize_i386nto_tdep (void)
381 gdbarch_register_osabi (bfd_arch_i386
, 0, GDB_OSABI_QNXNTO
,
383 gdbarch_register_osabi_sniffer (bfd_arch_i386
, bfd_target_elf_flavour
,
384 nto_elf_osabi_sniffer
);