gdb/amd64-sol2-tdep.c

   1 /* Target-dependent code for AMD64 Solaris.
   2
   3    Copyright (C) 2001-2020 Free Software Foundation, Inc.
   4
   5    Contributed by Joseph Myers, CodeSourcery, LLC.
   6
   7    This file is part of GDB.
   8
   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.
  13
  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.
  18
  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/>.  */
  21
  22 #include "defs.h"
  23 #include "frame.h"
  24 #include "gdbcore.h"
  25 #include "regcache.h"
  26 #include "osabi.h"
  27 #include "symtab.h"
  28
  29 #include "sol2-tdep.h"
  30 #include "amd64-tdep.h"
  31 #include "gdbsupport/x86-xstate.h"
  32 #include "solib-svr4.h"
  33
  34 /* Mapping between the general-purpose registers in gregset_t format
  35    and GDB's register cache layout.  */
  36
  37 /* From <sys/regset.h>.  */
  38 static int amd64_sol2_gregset_reg_offset[] = {
  39   14 * 8,                       /* %rax */
  40   11 * 8,                       /* %rbx */
  41   13 * 8,                       /* %rcx */
  42   12 * 8,                       /* %rdx */
  43   9 * 8,                        /* %rsi */
  44   8 * 8,                        /* %rdi */
  45   10 * 8,                       /* %rbp */
  46   20 * 8,                       /* %rsp */
  47   7 * 8,                        /* %r8 ...  */
  48   6 * 8,
  49   5 * 8,
  50   4 * 8,
  51   3 * 8,
  52   2 * 8,
  53   1 * 8,
  54   0 * 8,                        /* ... %r15 */
  55   17 * 8,                       /* %rip */
  56   19 * 8,                       /* %eflags */
  57   18 * 8,                       /* %cs */
  58   21 * 8,                       /* %ss */
  59   25 * 8,                       /* %ds */
  60   24 * 8,                       /* %es */
  61   22 * 8,                       /* %fs */
  62   23 * 8                        /* %gs */
  63 };
  64 \f
  65
  66 /* Return whether THIS_FRAME corresponds to a Solaris sigtramp
  67    routine.  */
  68
  69 static int
  70 amd64_sol2_sigtramp_p (struct frame_info *this_frame)
  71 {
  72   CORE_ADDR pc = get_frame_pc (this_frame);
  73   const char *name;
  74
  75   find_pc_partial_function (pc, &name, NULL, NULL);
  76   return (name && (strcmp ("sigacthandler", name) == 0
  77                    || strcmp (name, "ucbsigvechandler") == 0
  78                    || strcmp (name, "__sighndlr") == 0));
  79 }
  80
  81 /* Solaris doesn't have a 'struct sigcontext', but it does have a
  82    'mcontext_t' that contains the saved set of machine registers.  */
  83
  84 static CORE_ADDR
  85 amd64_sol2_mcontext_addr (struct frame_info *this_frame)
  86 {
  87   CORE_ADDR sp, ucontext_addr;
  88
  89   sp = get_frame_register_unsigned (this_frame, AMD64_RSP_REGNUM);
  90   ucontext_addr = get_frame_memory_unsigned (this_frame, sp + 8, 8);
  91
  92   return ucontext_addr + 72;
  93 }
  94
  95 static void
  96 amd64_sol2_init_abi (struct gdbarch_info info, struct gdbarch *gdbarch)
  97 {
  98   struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch);
  99
 100   tdep->gregset_reg_offset = amd64_sol2_gregset_reg_offset;
 101   tdep->gregset_num_regs = ARRAY_SIZE (amd64_sol2_gregset_reg_offset);
 102   tdep->sizeof_gregset = 28 * 8;
 103
 104   amd64_init_abi (info, gdbarch,
 105                   amd64_target_description (X86_XSTATE_SSE_MASK, true));
 106
 107   tdep->sigtramp_p = amd64_sol2_sigtramp_p;
 108   tdep->sigcontext_addr = amd64_sol2_mcontext_addr;
 109   tdep->sc_reg_offset = tdep->gregset_reg_offset;
 110   tdep->sc_num_regs = tdep->gregset_num_regs;
 111
 112   /* Solaris uses SVR4-style shared libraries.  */
 113   set_gdbarch_skip_solib_resolver (gdbarch, sol2_skip_solib_resolver);
 114   set_solib_svr4_fetch_link_map_offsets
 115     (gdbarch, svr4_lp64_fetch_link_map_offsets);
 116
 117   /* How to print LWP PTIDs from core files.  */
 118   set_gdbarch_core_pid_to_str (gdbarch, sol2_core_pid_to_str);
 119 }
 120
 121 void
 122 _initialize_amd64_sol2_tdep (void)
 123 {
 124   gdbarch_register_osabi (bfd_arch_i386, bfd_mach_x86_64,
 125                           GDB_OSABI_SOLARIS, amd64_sol2_init_abi);
 126 }