1 /* Target-dependent code for QNX Neutrino x86.
3 Copyright (C) 2003, 2004, 2007, 2008, 2009, 2010
4 Free Software Foundation, Inc.
6 Contributed by QNX Software Systems Ltd.
8 This file is part of GDB.
10 This program is free software; you can redistribute it and/or modify
11 it under the terms of the GNU General Public License as published by
12 the Free Software Foundation; either version 3 of the License, or
13 (at your option) any later version.
15 This program is distributed in the hope that it will be useful,
16 but WITHOUT ANY WARRANTY; without even the implied warranty of
17 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
18 GNU General Public License for more details.
20 You should have received a copy of the GNU General Public License
21 along with this program. If not, see <http://www.gnu.org/licenses/>. */
29 #include "gdb_assert.h"
30 #include "gdb_string.h"
32 #include "i386-tdep.h"
33 #include "i387-tdep.h"
36 #include "solib-svr4.h"
39 #define X86_CPU_FXSR (1L << 12)
42 /* Why 13? Look in our /usr/include/x86/context.h header at the
43 x86_cpu_registers structure and you'll see an 'exx' junk register
44 that is just filler. Don't ask me, ask the kernel guys. */
47 /* Mapping between the general-purpose registers in `struct xxx'
48 format and GDB's register cache layout. */
50 /* From <x86/context.h>. */
51 static int i386nto_gregset_reg_offset
[] =
68 /* Given a GDB register number REGNUM, return the offset into
69 Neutrino's register structure or -1 if the register is unknown. */
72 nto_reg_offset (int regnum
)
74 if (regnum
>= 0 && regnum
< ARRAY_SIZE (i386nto_gregset_reg_offset
))
75 return i386nto_gregset_reg_offset
[regnum
];
81 i386nto_supply_gregset (struct regcache
*regcache
, char *gpregs
)
83 struct gdbarch
*gdbarch
= get_regcache_arch (regcache
);
84 struct gdbarch_tdep
*tdep
= gdbarch_tdep (gdbarch
);
86 if(tdep
->gregset
== NULL
)
87 tdep
->gregset
= regset_alloc (gdbarch
, i386_supply_gregset
,
88 i386_collect_gregset
);
90 gdb_assert (tdep
->gregset_reg_offset
== i386nto_gregset_reg_offset
);
91 tdep
->gregset
->supply_regset (tdep
->gregset
, regcache
, -1,
92 gpregs
, NUM_GPREGS
* 4);
96 i386nto_supply_fpregset (struct regcache
*regcache
, char *fpregs
)
98 if (nto_cpuinfo_valid
&& nto_cpuinfo_flags
| X86_CPU_FXSR
)
99 i387_supply_fxsave (regcache
, -1, fpregs
);
101 i387_supply_fsave (regcache
, -1, fpregs
);
105 i386nto_supply_regset (struct regcache
*regcache
, int regset
, char *data
)
109 case NTO_REG_GENERAL
:
110 i386nto_supply_gregset (regcache
, data
);
113 i386nto_supply_fpregset (regcache
, data
);
119 i386nto_regset_id (int regno
)
123 else if (regno
< I386_NUM_GREGS
)
124 return NTO_REG_GENERAL
;
125 else if (regno
< I386_NUM_GREGS
+ I387_NUM_REGS
)
126 return NTO_REG_FLOAT
;
127 else if (regno
< I386_SSE_NUM_REGS
)
128 return NTO_REG_FLOAT
; /* We store xmm registers in fxsave_area. */
130 return -1; /* Error. */
134 i386nto_register_area (struct gdbarch
*gdbarch
,
135 int regno
, int regset
, unsigned *off
)
137 struct gdbarch_tdep
*tdep
= gdbarch_tdep (gdbarch
);
141 if (regset
== NTO_REG_GENERAL
)
144 return NUM_GPREGS
* 4;
146 *off
= nto_reg_offset (regno
);
151 else if (regset
== NTO_REG_FLOAT
)
153 unsigned off_adjust
, regsize
, regset_size
, regno_base
;
154 /* The following are flags indicating number in our fxsave_area. */
155 int first_four
= (regno
>= I387_FCTRL_REGNUM (tdep
)
156 && regno
<= I387_FISEG_REGNUM (tdep
));
157 int second_four
= (regno
> I387_FISEG_REGNUM (tdep
)
158 && regno
<= I387_FOP_REGNUM (tdep
));
159 int st_reg
= (regno
>= I387_ST0_REGNUM (tdep
)
160 && regno
< I387_ST0_REGNUM (tdep
) + 8);
161 int xmm_reg
= (regno
>= I387_XMM0_REGNUM (tdep
)
162 && regno
< I387_MXCSR_REGNUM (tdep
));
164 if (nto_cpuinfo_valid
&& nto_cpuinfo_flags
| X86_CPU_FXSR
)
169 /* fxsave_area structure. */
172 /* fpu_control_word, fpu_status_word, fpu_tag_word, fpu_operand
174 regsize
= 2; /* Two bytes each. */
176 regno_base
= I387_FCTRL_REGNUM (tdep
);
178 else if (second_four
)
180 /* fpu_ip, fpu_cs, fpu_op, fpu_ds registers. */
183 regno_base
= I387_FISEG_REGNUM (tdep
) + 1;
190 regno_base
= I387_ST0_REGNUM (tdep
);
197 regno_base
= I387_XMM0_REGNUM (tdep
);
199 else if (regno
== I387_MXCSR_REGNUM (tdep
))
203 regno_base
= I387_MXCSR_REGNUM (tdep
);
208 gdb_assert (regno
== -1);
211 regsize
= regset_size
;
217 /* fsave_area structure. */
218 if (first_four
|| second_four
)
220 /* fpu_control_word, ... , fpu_ds registers. */
223 regno_base
= I387_FCTRL_REGNUM (tdep
);
227 /* One of ST registers. */
230 regno_base
= I387_ST0_REGNUM (tdep
);
235 gdb_assert (regno
== -1);
238 regsize
= regset_size
;
243 *off
= off_adjust
+ (regno
- regno_base
) * regsize
;
252 i386nto_regset_fill (const struct regcache
*regcache
, int regset
, char *data
)
254 if (regset
== NTO_REG_GENERAL
)
258 for (regno
= 0; regno
< NUM_GPREGS
; regno
++)
260 int offset
= nto_reg_offset (regno
);
262 regcache_raw_collect (regcache
, regno
, data
+ offset
);
265 else if (regset
== NTO_REG_FLOAT
)
267 if (nto_cpuinfo_valid
&& nto_cpuinfo_flags
| X86_CPU_FXSR
)
268 i387_collect_fxsave (regcache
, -1, data
);
270 i387_collect_fsave (regcache
, -1, data
);
278 /* Return whether THIS_FRAME corresponds to a QNX Neutrino sigtramp
282 i386nto_sigtramp_p (struct frame_info
*this_frame
)
284 CORE_ADDR pc
= get_frame_pc (this_frame
);
287 find_pc_partial_function (pc
, &name
, NULL
, NULL
);
288 return name
&& strcmp ("__signalstub", name
) == 0;
291 /* Assuming THIS_FRAME is a QNX Neutrino sigtramp routine, return the
292 address of the associated sigcontext structure. */
295 i386nto_sigcontext_addr (struct frame_info
*this_frame
)
297 struct gdbarch
*gdbarch
= get_frame_arch (this_frame
);
298 enum bfd_endian byte_order
= gdbarch_byte_order (gdbarch
);
302 /* We store __ucontext_t addr in EDI register. */
303 get_frame_register (this_frame
, I386_EDI_REGNUM
, buf
);
304 ptrctx
= extract_unsigned_integer (buf
, 4, byte_order
);
305 ptrctx
+= 24 /* Context pointer is at this offset. */;
311 init_i386nto_ops (void)
313 nto_regset_id
= i386nto_regset_id
;
314 nto_supply_gregset
= i386nto_supply_gregset
;
315 nto_supply_fpregset
= i386nto_supply_fpregset
;
316 nto_supply_altregset
= nto_dummy_supply_regset
;
317 nto_supply_regset
= i386nto_supply_regset
;
318 nto_register_area
= i386nto_register_area
;
319 nto_regset_fill
= i386nto_regset_fill
;
320 nto_fetch_link_map_offsets
=
321 svr4_ilp32_fetch_link_map_offsets
;
325 i386nto_init_abi (struct gdbarch_info info
, struct gdbarch
*gdbarch
)
327 struct gdbarch_tdep
*tdep
= gdbarch_tdep (gdbarch
);
328 static struct target_so_ops nto_svr4_so_ops
;
330 /* Deal with our strange signals. */
331 nto_initialize_signals ();
334 i386_elf_init_abi (info
, gdbarch
);
336 /* Neutrino rewinds to look more normal. Need to override the i386
337 default which is [unfortunately] to decrement the PC. */
338 set_gdbarch_decr_pc_after_break (gdbarch
, 0);
340 tdep
->gregset_reg_offset
= i386nto_gregset_reg_offset
;
341 tdep
->gregset_num_regs
= ARRAY_SIZE (i386nto_gregset_reg_offset
);
342 tdep
->sizeof_gregset
= NUM_GPREGS
* 4;
344 tdep
->sigtramp_p
= i386nto_sigtramp_p
;
345 tdep
->sigcontext_addr
= i386nto_sigcontext_addr
;
346 tdep
->sc_reg_offset
= i386nto_gregset_reg_offset
;
347 tdep
->sc_num_regs
= ARRAY_SIZE (i386nto_gregset_reg_offset
);
349 /* Setjmp()'s return PC saved in EDX (5). */
350 tdep
->jb_pc_offset
= 20; /* 5x32 bit ints in. */
352 set_solib_svr4_fetch_link_map_offsets
353 (gdbarch
, svr4_ilp32_fetch_link_map_offsets
);
355 /* Initialize this lazily, to avoid an initialization order
356 dependency on solib-svr4.c's _initialize routine. */
357 if (nto_svr4_so_ops
.in_dynsym_resolve_code
== NULL
)
359 nto_svr4_so_ops
= svr4_so_ops
;
361 /* Our loader handles solib relocations differently than svr4. */
362 nto_svr4_so_ops
.relocate_section_addresses
363 = nto_relocate_section_addresses
;
365 /* Supply a nice function to find our solibs. */
366 nto_svr4_so_ops
.find_and_open_solib
367 = nto_find_and_open_solib
;
369 /* Our linker code is in libc. */
370 nto_svr4_so_ops
.in_dynsym_resolve_code
371 = nto_in_dynsym_resolve_code
;
373 set_solib_ops (gdbarch
, &nto_svr4_so_ops
);
376 /* Provide a prototype to silence -Wmissing-prototypes. */
377 extern initialize_file_ftype _initialize_i386nto_tdep
;
380 _initialize_i386nto_tdep (void)
383 gdbarch_register_osabi (bfd_arch_i386
, 0, GDB_OSABI_QNXNTO
,
385 gdbarch_register_osabi_sniffer (bfd_arch_i386
, bfd_target_elf_flavour
,
386 nto_elf_osabi_sniffer
);