gdb/amd64nbsd-tdep.c

   1 /* Target-dependent code for NetBSD/amd64.
   2
   3    Copyright (C) 2003, 2004, 2007, 2008 Free Software Foundation, Inc.
   4
   5    This file is part of GDB.
   6
   7    This program is free software; you can redistribute it and/or modify
   8    it under the terms of the GNU General Public License as published by
   9    the Free Software Foundation; either version 3 of the License, or
  10    (at your option) any later version.
  11
  12    This program is distributed in the hope that it will be useful,
  13    but WITHOUT ANY WARRANTY; without even the implied warranty of
  14    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  15    GNU General Public License for more details.
  16
  17    You should have received a copy of the GNU General Public License
  18    along with this program.  If not, see <http://www.gnu.org/licenses/>.  */
  19
  20 #include "defs.h"
  21 #include "arch-utils.h"
  22 #include "frame.h"
  23 #include "gdbcore.h"
  24 #include "osabi.h"
  25 #include "symtab.h"
  26
  27 #include "gdb_assert.h"
  28
  29 #include "amd64-tdep.h"
  30 #include "nbsd-tdep.h"
  31 #include "solib-svr4.h"
  32
  33 /* Support for signal handlers.  */
  34
  35 /* Return whether the frame preceding NEXT_FRAME corresponds to a
  36    NetBSD sigtramp routine.  */
  37
  38 static int
  39 amd64nbsd_sigtramp_p (struct frame_info *next_frame)
  40 {
  41   CORE_ADDR pc = frame_pc_unwind (next_frame);
  42   char *name;
  43
  44   find_pc_partial_function (pc, &name, NULL, NULL);
  45   return nbsd_pc_in_sigtramp (pc, name);
  46 }
  47
  48 /* Assuming NEXT_FRAME is preceded by a frame corresponding to a
  49    NetBSD sigtramp routine, return the address of the associated
  50    mcontext structure.  */
  51
  52 static CORE_ADDR
  53 amd64nbsd_mcontext_addr (struct frame_info *next_frame)
  54 {
  55   CORE_ADDR addr;
  56
  57   /* The register %r15 points at `struct ucontext' upon entry of a
  58      signal trampoline.  */
  59   addr = frame_unwind_register_unsigned (next_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_ndep (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 }