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 + I386_NUM_FREGS)
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);