gdb/amd64nbsd-tdep.c

   1 /* Target-dependent code for NetBSD/amd64.
   2
   3    Copyright (C) 2003, 2004, 2007, 2008, 2009, 2010
   4    Free Software Foundation, Inc.
   5
   6    This file is part of GDB.
   7
   8    This program is free software; you can redistribute it and/or modify
   9    it under the terms of the GNU General Public License as published by
  10    the Free Software Foundation; either version 3 of the License, or
  11    (at your option) any later version.
  12
  13    This program is distributed in the hope that it will be useful,
  14    but WITHOUT ANY WARRANTY; without even the implied warranty of
  15    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  16    GNU General Public License for more details.
  17
  18    You should have received a copy of the GNU General Public License
  19    along with this program.  If not, see <http://www.gnu.org/licenses/>.  */
  20
  21 #include "defs.h"
  22 #include "arch-utils.h"
  23 #include "frame.h"
  24 #include "gdbcore.h"
  25 #include "osabi.h"
  26 #include "symtab.h"
  27
  28 #include "gdb_assert.h"
  29
  30 #include "amd64-tdep.h"
  31 #include "nbsd-tdep.h"
  32 #include "solib-svr4.h"
  33
  34 /* Support for signal handlers.  */
  35
  36 /* Return whether THIS_FRAME corresponds to a NetBSD sigtramp
  37    routine.  */
  38
  39 static int
  40 amd64nbsd_sigtramp_p (struct frame_info *this_frame)
  41 {
  42   CORE_ADDR pc = get_frame_pc (this_frame);
  43   char *name;
  44
  45   find_pc_partial_function (pc, &name, NULL, NULL);
  46   return nbsd_pc_in_sigtramp (pc, name);
  47 }
  48
  49 /* Assuming THIS_FRAME corresponds to a NetBSD sigtramp routine,
  50    return the address of the associated mcontext structure.  */
  51
  52 static CORE_ADDR
  53 amd64nbsd_mcontext_addr (struct frame_info *this_frame)
  54 {
  55   CORE_ADDR addr;
  56
  57   /* The register %r15 points at `struct ucontext' upon entry of a
  58      signal trampoline.  */
  59   addr = get_frame_register_unsigned (this_frame, AMD64_R15_REGNUM);
  60
  61   /* The mcontext structure lives as offset 56 in `struct ucontext'.  */
  62   return addr + 56;
  63 }
  64 \f
  65 /* NetBSD 2.0 or later.  */
  66
  67 /* Mapping between the general-purpose registers in `struct reg'
  68    format and GDB's register cache layout.  */
  69
  70 /* From <machine/reg.h>.  */
  71 int amd64nbsd_r_reg_offset[] =
  72 {
  73   14 * 8,                       /* %rax */
  74   13 * 8,                       /* %rbx */
  75   3 * 8,                        /* %rcx */
  76   2 * 8,                        /* %rdx */
  77   1 * 8,                        /* %rsi */
  78   0 * 8,                        /* %rdi */
  79   12 * 8,                       /* %rbp */
  80   24 * 8,                       /* %rsp */
  81   4 * 8,                        /* %r8 .. */
  82   5 * 8,
  83   6 * 8,
  84   7 * 8,
  85   8 * 8,
  86   9 * 8,
  87   10 * 8,
  88   11 * 8,                       /* ... %r15 */
  89   21 * 8,                       /* %rip */
  90   23 * 8,                       /* %eflags */
  91   22 * 8,                       /* %cs */
  92   25 * 8,                       /* %ss */
  93   18 * 8,                       /* %ds */
  94   17 * 8,                       /* %es */
  95   16 * 8,                       /* %fs */
  96   15 * 8                        /* %gs */
  97 };
  98
  99 static void
 100 amd64nbsd_init_abi (struct gdbarch_info info, struct gdbarch *gdbarch)
 101 {
 102   struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch);
 103
 104   /* Initialize general-purpose register set details first.  */
 105   tdep->gregset_reg_offset = amd64nbsd_r_reg_offset;
 106   tdep->gregset_num_regs = ARRAY_SIZE (amd64nbsd_r_reg_offset);
 107   tdep->sizeof_gregset = 26 * 8;
 108
 109   amd64_init_abi (info, gdbarch);
 110
 111   tdep->jb_pc_offset = 7 * 8;
 112
 113   /* NetBSD has its own convention for signal trampolines.  */
 114   tdep->sigtramp_p = amd64nbsd_sigtramp_p;
 115   tdep->sigcontext_addr = amd64nbsd_mcontext_addr;
 116   tdep->sc_reg_offset = amd64nbsd_r_reg_offset;
 117   tdep->sc_num_regs = ARRAY_SIZE (amd64nbsd_r_reg_offset);
 118
 119   /* NetBSD uses SVR4-style shared libraries.  */
 120   set_solib_svr4_fetch_link_map_offsets
 121     (gdbarch, svr4_lp64_fetch_link_map_offsets);
 122 }
 123 \f
 124
 125 /* Provide a prototype to silence -Wmissing-prototypes.  */
 126 void _initialize_amd64nbsd_tdep (void);
 127
 128 void
 129 _initialize_amd64nbsd_tdep (void)
 130 {
 131   /* The NetBSD/amd64 native dependent code makes this assumption.  */
 132   gdb_assert (ARRAY_SIZE (amd64nbsd_r_reg_offset) == AMD64_NUM_GREGS);
 133
 134   gdbarch_register_osabi (bfd_arch_i386, bfd_mach_x86_64,
 135                           GDB_OSABI_NETBSD_ELF, amd64nbsd_init_abi);
 136 }