1 /* Target-dependent code for QNX Neutrino x86.
3 Copyright (C) 2003, 2004, 2007, 2008, 2009 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"
29 #include "gdb_string.h"
31 #include "i386-tdep.h"
32 #include "i387-tdep.h"
35 #include "solib-svr4.h"
37 /* Target vector for QNX NTO x86. */
38 static struct nto_target_ops i386_nto_target;
41 #define X86_CPU_FXSR (1L << 12)
44 /* Why 13? Look in our /usr/include/x86/context.h header at the
45 x86_cpu_registers structure and you'll see an 'exx' junk register
46 that is just filler. Don't ask me, ask the kernel guys. */
49 /* Mapping between the general-purpose registers in `struct xxx'
50 format and GDB's register cache layout. */
52 /* From <x86/context.h>. */
53 static int i386nto_gregset_reg_offset[] =
70 /* Given a GDB register number REGNUM, return the offset into
71 Neutrino's register structure or -1 if the register is unknown. */
74 nto_reg_offset (int regnum)
76 if (regnum >= 0 && regnum < ARRAY_SIZE (i386nto_gregset_reg_offset))
77 return i386nto_gregset_reg_offset[regnum];
83 i386nto_supply_gregset (struct regcache *regcache, char *gpregs)
85 struct gdbarch *gdbarch = get_regcache_arch (regcache);
86 struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch);
88 if(tdep->gregset == NULL)
89 tdep->gregset = regset_alloc (gdbarch, i386_supply_gregset,
90 i386_collect_gregset);
92 gdb_assert (tdep->gregset_reg_offset == i386nto_gregset_reg_offset);
93 tdep->gregset->supply_regset (tdep->gregset, regcache, -1,
94 gpregs, NUM_GPREGS * 4);
98 i386nto_supply_fpregset (struct regcache *regcache, char *fpregs)
100 if (nto_cpuinfo_valid && nto_cpuinfo_flags | X86_CPU_FXSR)
101 i387_supply_fxsave (regcache, -1, fpregs);
103 i387_supply_fsave (regcache, -1, fpregs);
107 i386nto_supply_regset (struct regcache *regcache, int regset, char *data)
111 case NTO_REG_GENERAL:
112 i386nto_supply_gregset (regcache, data);
115 i386nto_supply_fpregset (regcache, data);
121 i386nto_regset_id (int regno)
125 else if (regno < I386_NUM_GREGS)
126 return NTO_REG_GENERAL;
127 else if (regno < I386_NUM_GREGS + I386_NUM_FREGS)
128 return NTO_REG_FLOAT;
129 else if (regno < I386_SSE_NUM_REGS)
130 return NTO_REG_FLOAT; /* We store xmm registers in fxsave_area. */
132 return -1; /* Error. */
136 i386nto_register_area (struct gdbarch *gdbarch,
137 int regno, int regset, unsigned *off)
139 struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch);
143 if (regset == NTO_REG_GENERAL)
146 return NUM_GPREGS * 4;
148 *off = nto_reg_offset (regno);
153 else if (regset == NTO_REG_FLOAT)
155 unsigned off_adjust, regsize, regset_size, regno_base;
156 /* The following are flags indicating number in our fxsave_area. */
157 int first_four = (regno >= I387_FCTRL_REGNUM (tdep)
158 && regno <= I387_FISEG_REGNUM (tdep));
159 int second_four = (regno > I387_FISEG_REGNUM (tdep)
160 && regno <= I387_FOP_REGNUM (tdep));
161 int st_reg = (regno >= I387_ST0_REGNUM (tdep)
162 && regno < I387_ST0_REGNUM (tdep) + 8);
163 int xmm_reg = (regno >= I387_XMM0_REGNUM (tdep)
164 && regno < I387_MXCSR_REGNUM (tdep));
166 if (nto_cpuinfo_valid && nto_cpuinfo_flags | X86_CPU_FXSR)
171 /* fxsave_area structure. */
174 /* fpu_control_word, fpu_status_word, fpu_tag_word, fpu_operand
176 regsize = 2; /* Two bytes each. */
178 regno_base = I387_FCTRL_REGNUM (tdep);
180 else if (second_four)
182 /* fpu_ip, fpu_cs, fpu_op, fpu_ds registers. */
185 regno_base = I387_FISEG_REGNUM (tdep) + 1;
192 regno_base = I387_ST0_REGNUM (tdep);
199 regno_base = I387_XMM0_REGNUM (tdep);
201 else if (regno == I387_MXCSR_REGNUM (tdep))
205 regno_base = I387_MXCSR_REGNUM (tdep);
210 gdb_assert (regno == -1);
213 regsize = regset_size;
219 /* fsave_area structure. */
220 if (first_four || second_four)
222 /* fpu_control_word, ... , fpu_ds registers. */
225 regno_base = I387_FCTRL_REGNUM (tdep);
229 /* One of ST registers. */
232 regno_base = I387_ST0_REGNUM (tdep);
237 gdb_assert (regno == -1);
240 regsize = regset_size;
245 *off = off_adjust + (regno - regno_base) * regsize;
254 i386nto_regset_fill (const struct regcache *regcache, int regset, char *data)
256 if (regset == NTO_REG_GENERAL)
260 for (regno = 0; regno < NUM_GPREGS; regno++)
262 int offset = nto_reg_offset (regno);
264 regcache_raw_collect (regcache, regno, data + offset);
267 else if (regset == NTO_REG_FLOAT)
269 if (nto_cpuinfo_valid && nto_cpuinfo_flags | X86_CPU_FXSR)
270 i387_collect_fxsave (regcache, -1, data);
272 i387_collect_fsave (regcache, -1, data);
280 /* Return whether THIS_FRAME corresponds to a QNX Neutrino sigtramp
284 i386nto_sigtramp_p (struct frame_info *this_frame)
286 CORE_ADDR pc = get_frame_pc (this_frame);
289 find_pc_partial_function (pc, &name, NULL, NULL);
290 return name && strcmp ("__signalstub", name) == 0;
293 #define I386_NTO_SIGCONTEXT_OFFSET 136
295 /* Assuming THIS_FRAME is a QNX Neutrino sigtramp routine, return the
296 address of the associated sigcontext structure. */
299 i386nto_sigcontext_addr (struct frame_info *this_frame)
304 get_frame_register (this_frame, I386_ESP_REGNUM, buf);
305 sp = extract_unsigned_integer (buf, 4);
307 return sp + I386_NTO_SIGCONTEXT_OFFSET;
311 init_i386nto_ops (void)
313 i386_nto_target.regset_id = i386nto_regset_id;
314 i386_nto_target.supply_gregset = i386nto_supply_gregset;
315 i386_nto_target.supply_fpregset = i386nto_supply_fpregset;
316 i386_nto_target.supply_altregset = nto_dummy_supply_regset;
317 i386_nto_target.supply_regset = i386nto_supply_regset;
318 i386_nto_target.register_area = i386nto_register_area;
319 i386_nto_target.regset_fill = i386nto_regset_fill;
320 i386_nto_target.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_pc_offset = 56;
347 tdep->sc_sp_offset = 68;
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);
375 nto_set_target (&i386_nto_target);
378 /* Provide a prototype to silence -Wmissing-prototypes. */
379 extern initialize_file_ftype _initialize_i386nto_tdep;
382 _initialize_i386nto_tdep (void)
385 gdbarch_register_osabi (bfd_arch_i386, 0, GDB_OSABI_QNXNTO,
387 gdbarch_register_osabi_sniffer (bfd_arch_i386, bfd_target_elf_flavour,
388 nto_elf_osabi_sniffer);