gdb/i386-sol2-tdep.c

   1 /* Target-dependent code for Solaris x86.
   2
   3    Copyright (C) 2002, 2003, 2004, 2006, 2007, 2008
   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 "value.h"
  23 #include "osabi.h"
  24
  25 #include "gdb_string.h"
  26
  27 #include "sol2-tdep.h"
  28 #include "i386-tdep.h"
  29 #include "solib-svr4.h"
  30
  31 /* From <ia32/sys/reg.h>.  */
  32 static int i386_sol2_gregset_reg_offset[] =
  33 {
  34   11 * 4,                       /* %eax */
  35   10 * 4,                       /* %ecx */
  36   9 * 4,                        /* %edx */
  37   8 * 4,                        /* %ebx */
  38   17 * 4,                       /* %esp */
  39   6 * 4,                        /* %ebp */
  40   5 * 4,                        /* %esi */
  41   4 * 4,                        /* %edi */
  42   14 * 4,                       /* %eip */
  43   16 * 4,                       /* %eflags */
  44   15 * 4,                       /* %cs */
  45   18 * 4,                       /* %ss */
  46   3 * 4,                        /* %ds */
  47   2 * 4,                        /* %es */
  48   1 * 4,                        /* %fs */
  49   0 * 4                         /* %gs */
  50 };
  51
  52 /* Return whether the frame preceding NEXT_FRAME corresponds to a
  53    Solaris sigtramp routine.  */
  54
  55 static int
  56 i386_sol2_sigtramp_p (struct frame_info *next_frame)
  57 {
  58   CORE_ADDR pc = frame_pc_unwind (next_frame);
  59   char *name;
  60
  61   find_pc_partial_function (pc, &name, NULL, NULL);
  62   return (name && (strcmp ("sigacthandler", name) == 0
  63                    || strcmp (name, "ucbsigvechandler") == 0));
  64 }
  65
  66 /* Solaris doesn't have a `struct sigcontext', but it does have a
  67    `mcontext_t' that contains the saved set of machine registers.  */
  68
  69 static CORE_ADDR
  70 i386_sol2_mcontext_addr (struct frame_info *next_frame)
  71 {
  72   CORE_ADDR sp, ucontext_addr;
  73
  74   sp = frame_unwind_register_unsigned (next_frame, I386_ESP_REGNUM);
  75   ucontext_addr = get_frame_memory_unsigned (next_frame, sp + 8, 4);
  76
  77   return ucontext_addr + 36;
  78 }
  79
  80 /* SunPRO encodes the static variables.  This is not related to C++
  81    mangling, it is done for C too.  */
  82
  83 static char *
  84 i386_sol2_static_transform_name (char *name)
  85 {
  86   char *p;
  87   if (name[0] == '.')
  88     {
  89       /* For file-local statics there will be a period, a bunch of
  90          junk (the contents of which match a string given in the
  91          N_OPT), a period and the name.  For function-local statics
  92          there will be a bunch of junk (which seems to change the
  93          second character from 'A' to 'B'), a period, the name of the
  94          function, and the name.  So just skip everything before the
  95          last period.  */
  96       p = strrchr (name, '.');
  97       if (p != NULL)
  98         name = p + 1;
  99     }
 100   return name;
 101 }
 102
 103 /* Solaris 2.  */
 104
 105 static void
 106 i386_sol2_init_abi (struct gdbarch_info info, struct gdbarch *gdbarch)
 107 {
 108   struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch);
 109
 110   /* Solaris is SVR4-based.  */
 111   i386_svr4_init_abi (info, gdbarch);
 112
 113   /* The SunPRO compiler puts out 0 instead of the address in N_SO symbols,
 114      and for SunPRO 3.0, N_FUN symbols too.  */
 115   set_gdbarch_sofun_address_maybe_missing (gdbarch, 1);
 116
 117   /* Handle SunPRO encoding of static symbols.  */
 118   set_gdbarch_static_transform_name (gdbarch, i386_sol2_static_transform_name);
 119
 120   /* Solaris reserves space for its FPU emulator in `fpregset_t'.
 121      There is also some space reserved for the registers of a Weitek
 122      math coprocessor.  */
 123   tdep->gregset_reg_offset = i386_sol2_gregset_reg_offset;
 124   tdep->gregset_num_regs = ARRAY_SIZE (i386_sol2_gregset_reg_offset);
 125   tdep->sizeof_gregset = 19 * 4;
 126   tdep->sizeof_fpregset = 380;
 127
 128   /* Signal trampolines are slightly different from SVR4.  */
 129   tdep->sigtramp_p = i386_sol2_sigtramp_p;
 130   tdep->sigcontext_addr = i386_sol2_mcontext_addr;
 131   tdep->sc_reg_offset = tdep->gregset_reg_offset;
 132   tdep->sc_num_regs = tdep->gregset_num_regs;
 133
 134   /* Solaris has SVR4-style shared libraries.  */
 135   set_gdbarch_skip_solib_resolver (gdbarch, sol2_skip_solib_resolver);
 136   set_solib_svr4_fetch_link_map_offsets
 137     (gdbarch, svr4_ilp32_fetch_link_map_offsets);
 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 }