gdb/amd64nbsd-tdep.c

   1 /* Target-dependent code for NetBSD/amd64.
   2
   3    Copyright (C) 2003, 2004, 2007 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 2 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, write to the Free Software
  19    Foundation, Inc., 51 Franklin Street, Fifth Floor,
  20    Boston, MA 02110-1301, USA.  */
  21
  22 #include "defs.h"
  23 #include "arch-utils.h"
  24 #include "frame.h"
  25 #include "gdbcore.h"
  26 #include "osabi.h"
  27 #include "symtab.h"
  28
  29 #include "gdb_assert.h"
  30
  31 #include "amd64-tdep.h"
  32 #include "nbsd-tdep.h"
  33 #include "solib-svr4.h"
  34
  35 /* Support for signal handlers.  */
  36
  37 /* Return whether the frame preceding NEXT_FRAME corresponds to a
  38    NetBSD sigtramp routine.  */
  39
  40 static int
  41 amd64nbsd_sigtramp_p (struct frame_info *next_frame)
  42 {
  43   CORE_ADDR pc = frame_pc_unwind (next_frame);
  44   char *name;
  45
  46   find_pc_partial_function (pc, &name, NULL, NULL);
  47   return nbsd_pc_in_sigtramp (pc, name);
  48 }
  49
  50 /* Assuming NEXT_FRAME is preceded by a frame corresponding to a
  51    NetBSD sigtramp routine, return the address of the associated
  52    mcontext structure.  */
  53
  54 static CORE_ADDR
  55 amd64nbsd_mcontext_addr (struct frame_info *next_frame)
  56 {
  57   CORE_ADDR addr;
  58
  59   /* The register %r15 points at `struct ucontext' upon entry of a
  60      signal trampoline.  */
  61   addr = frame_unwind_register_unsigned (next_frame, AMD64_R15_REGNUM);
  62
  63   /* The mcontext structure lives as offset 56 in `struct ucontext'.  */
  64   return addr + 56;
  65 }
  66 \f
  67 /* NetBSD 2.0 or later.  */
  68
  69 /* Mapping between the general-purpose registers in `struct reg'
  70    format and GDB's register cache layout.  */
  71
  72 /* From <machine/reg.h>.  */
  73 int amd64nbsd_r_reg_offset[] =
  74 {
  75   14 * 8,                       /* %rax */
  76   13 * 8,                       /* %rbx */
  77   3 * 8,                        /* %rcx */
  78   2 * 8,                        /* %rdx */
  79   1 * 8,                        /* %rsi */
  80   0 * 8,                        /* %rdi */
  81   12 * 8,                       /* %rbp */
  82   24 * 8,                       /* %rsp */
  83   4 * 8,                        /* %r8 .. */
  84   5 * 8,
  85   6 * 8,
  86   7 * 8,
  87   8 * 8,
  88   9 * 8,
  89   10 * 8,
  90   11 * 8,                       /* ... %r15 */
  91   21 * 8,                       /* %rip */
  92   23 * 8,                       /* %eflags */
  93   22 * 8,                       /* %cs */
  94   25 * 8,                       /* %ss */
  95   18 * 8,                       /* %ds */
  96   17 * 8,                       /* %es */
  97   16 * 8,                       /* %fs */
  98   15 * 8                        /* %gs */
  99 };
 100
 101 static void
 102 amd64nbsd_init_abi (struct gdbarch_info info, struct gdbarch *gdbarch)
 103 {
 104   struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch);
 105
 106   /* Initialize general-purpose register set details first.  */
 107   tdep->gregset_reg_offset = amd64nbsd_r_reg_offset;
 108   tdep->gregset_num_regs = ARRAY_SIZE (amd64nbsd_r_reg_offset);
 109   tdep->sizeof_gregset = 26 * 8;
 110
 111   amd64_init_abi (info, gdbarch);
 112
 113   tdep->jb_pc_offset = 7 * 8;
 114
 115   /* NetBSD has its own convention for signal trampolines.  */
 116   tdep->sigtramp_p = amd64nbsd_sigtramp_p;
 117   tdep->sigcontext_addr = amd64nbsd_mcontext_addr;
 118   tdep->sc_reg_offset = amd64nbsd_r_reg_offset;
 119   tdep->sc_num_regs = ARRAY_SIZE (amd64nbsd_r_reg_offset);
 120
 121   /* NetBSD uses SVR4-style shared libraries.  */
 122   set_solib_svr4_fetch_link_map_offsets
 123     (gdbarch, svr4_lp64_fetch_link_map_offsets);
 124 }
 125 \f
 126
 127 /* Provide a prototype to silence -Wmissing-prototypes.  */
 128 void _initialize_amd64nbsd_tdep (void);
 129
 130 void
 131 _initialize_amd64nbsd_ndep (void)
 132 {
 133   /* The NetBSD/amd64 native dependent code makes this assumption.  */
 134   gdb_assert (ARRAY_SIZE (amd64nbsd_r_reg_offset) == AMD64_NUM_GREGS);
 135
 136   gdbarch_register_osabi (bfd_arch_i386, bfd_mach_x86_64,
 137                           GDB_OSABI_NETBSD_ELF, amd64nbsd_init_abi);
 138 }