gdb/i386-sol2-tdep.c

   1 /* Target-dependent code for Solaris x86.
   2
   3    Copyright (C) 2002-2015 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 "value.h"
  22 #include "osabi.h"
  23
  24 #include "sol2-tdep.h"
  25 #include "i386-tdep.h"
  26 #include "solib-svr4.h"
  27
  28 /* From <ia32/sys/reg.h>.  */
  29 static int i386_sol2_gregset_reg_offset[] =
  30 {
  31   11 * 4,                       /* %eax */
  32   10 * 4,                       /* %ecx */
  33   9 * 4,                        /* %edx */
  34   8 * 4,                        /* %ebx */
  35   17 * 4,                       /* %esp */
  36   6 * 4,                        /* %ebp */
  37   5 * 4,                        /* %esi */
  38   4 * 4,                        /* %edi */
  39   14 * 4,                       /* %eip */
  40   16 * 4,                       /* %eflags */
  41   15 * 4,                       /* %cs */
  42   18 * 4,                       /* %ss */
  43   3 * 4,                        /* %ds */
  44   2 * 4,                        /* %es */
  45   1 * 4,                        /* %fs */
  46   0 * 4                         /* %gs */
  47 };
  48
  49 /* Return whether THIS_FRAME corresponds to a Solaris sigtramp
  50    routine.  */
  51
  52 static int
  53 i386_sol2_sigtramp_p (struct frame_info *this_frame)
  54 {
  55   CORE_ADDR pc = get_frame_pc (this_frame);
  56   const char *name;
  57
  58   find_pc_partial_function (pc, &name, NULL, NULL);
  59   return (name && (strcmp ("sigacthandler", name) == 0
  60                    || strcmp (name, "ucbsigvechandler") == 0));
  61 }
  62
  63 /* Solaris doesn't have a `struct sigcontext', but it does have a
  64    `mcontext_t' that contains the saved set of machine registers.  */
  65
  66 static CORE_ADDR
  67 i386_sol2_mcontext_addr (struct frame_info *this_frame)
  68 {
  69   CORE_ADDR sp, ucontext_addr;
  70
  71   sp = get_frame_register_unsigned (this_frame, I386_ESP_REGNUM);
  72   ucontext_addr = get_frame_memory_unsigned (this_frame, sp + 8, 4);
  73
  74   return ucontext_addr + 36;
  75 }
  76
  77 /* SunPRO encodes the static variables.  This is not related to C++
  78    mangling, it is done for C too.  */
  79
  80 static const char *
  81 i386_sol2_static_transform_name (const char *name)
  82 {
  83   char *p;
  84   if (name[0] == '.')
  85     {
  86       /* For file-local statics there will be a period, a bunch of
  87          junk (the contents of which match a string given in the
  88          N_OPT), a period and the name.  For function-local statics
  89          there will be a bunch of junk (which seems to change the
  90          second character from 'A' to 'B'), a period, the name of the
  91          function, and the name.  So just skip everything before the
  92          last period.  */
  93       p = strrchr (name, '.');
  94       if (p != NULL)
  95         name = p + 1;
  96     }
  97   return name;
  98 }
  99
 100 /* Solaris 2.  */
 101
 102 static void
 103 i386_sol2_init_abi (struct gdbarch_info info, struct gdbarch *gdbarch)
 104 {
 105   struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch);
 106
 107   /* Solaris is SVR4-based.  */
 108   i386_svr4_init_abi (info, gdbarch);
 109
 110   /* The SunPRO compiler puts out 0 instead of the address in N_SO symbols,
 111      and for SunPRO 3.0, N_FUN symbols too.  */
 112   set_gdbarch_sofun_address_maybe_missing (gdbarch, 1);
 113
 114   /* Handle SunPRO encoding of static symbols.  */
 115   set_gdbarch_static_transform_name (gdbarch, i386_sol2_static_transform_name);
 116
 117   /* Solaris reserves space for its FPU emulator in `fpregset_t'.
 118      There is also some space reserved for the registers of a Weitek
 119      math coprocessor.  */
 120   tdep->gregset_reg_offset = i386_sol2_gregset_reg_offset;
 121   tdep->gregset_num_regs = ARRAY_SIZE (i386_sol2_gregset_reg_offset);
 122   tdep->sizeof_gregset = 19 * 4;
 123   tdep->sizeof_fpregset = 380;
 124
 125   /* Signal trampolines are slightly different from SVR4.  */
 126   tdep->sigtramp_p = i386_sol2_sigtramp_p;
 127   tdep->sigcontext_addr = i386_sol2_mcontext_addr;
 128   tdep->sc_reg_offset = tdep->gregset_reg_offset;
 129   tdep->sc_num_regs = tdep->gregset_num_regs;
 130
 131   /* Solaris has SVR4-style shared libraries.  */
 132   set_gdbarch_skip_solib_resolver (gdbarch, sol2_skip_solib_resolver);
 133   set_solib_svr4_fetch_link_map_offsets
 134     (gdbarch, svr4_ilp32_fetch_link_map_offsets);
 135
 136   /* How to print LWP PTIDs from core files.  */
 137   set_gdbarch_core_pid_to_str (gdbarch, sol2_core_pid_to_str);
 138 }
 139 \f
 140
 141 static enum gdb_osabi
 142 i386_sol2_osabi_sniffer (bfd *abfd)
 143 {
 144   /* If we have a section named .SUNW_version, then it is almost
 145      certainly Solaris 2.  */
 146   if (bfd_get_section_by_name (abfd, ".SUNW_version"))
 147     return GDB_OSABI_SOLARIS;
 148
 149   return GDB_OSABI_UNKNOWN;
 150 }
 151
 152 /* Provide a prototype to silence -Wmissing-prototypes.  */
 153 void _initialize_i386_sol2_tdep (void);
 154
 155 void
 156 _initialize_i386_sol2_tdep (void)
 157 {
 158   /* Register an ELF OS ABI sniffer for Solaris 2 binaries.  */
 159   gdbarch_register_osabi_sniffer (bfd_arch_i386, bfd_target_elf_flavour,
 160                                   i386_sol2_osabi_sniffer);
 161
 162   gdbarch_register_osabi (bfd_arch_i386, 0, GDB_OSABI_SOLARIS,
 163                           i386_sol2_init_abi);
 164 }