gdb/i386-sol2-tdep.c

   1 /* Target-dependent code for Solaris x86.
   2
   3    Copyright 2002, 2003, 2004 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., 59 Temple Place - Suite 330,
  20    Boston, MA 02111-1307, USA.  */
  21
  22 #include "defs.h"
  23 #include "value.h"
  24 #include "osabi.h"
  25
  26 #include "gdb_string.h"
  27
  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 /* Solaris 2.  */
  81
  82 static void
  83 i386_sol2_init_abi (struct gdbarch_info info, struct gdbarch *gdbarch)
  84 {
  85   struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch);
  86
  87   /* Solaris is SVR4-based.  */
  88   i386_svr4_init_abi (info, gdbarch);
  89
  90   /* Solaris reserves space for its FPU emulator in `fpregset_t'.
  91      There is also some space reserved for the registers of a Weitek
  92      math coprocessor.  */
  93   tdep->gregset_reg_offset = i386_sol2_gregset_reg_offset;
  94   tdep->gregset_num_regs = ARRAY_SIZE (i386_sol2_gregset_reg_offset);
  95   tdep->sizeof_gregset = 19 * 4;
  96   tdep->sizeof_fpregset = 380;
  97
  98   /* Signal trampolines are slightly different from SVR4.  */
  99   tdep->sigtramp_p = i386_sol2_sigtramp_p;
 100   tdep->sigcontext_addr = i386_sol2_mcontext_addr;
 101   tdep->sc_reg_offset = tdep->gregset_reg_offset;
 102   tdep->sc_num_regs = tdep->gregset_num_regs;
 103
 104   set_solib_svr4_fetch_link_map_offsets
 105     (gdbarch, svr4_ilp32_fetch_link_map_offsets);
 106 }
 107 \f
 108
 109 static enum gdb_osabi
 110 i386_sol2_osabi_sniffer (bfd *abfd)
 111 {
 112   /* If we have a section named .SUNW_version, then it is almost
 113      certainly Solaris 2.  */
 114   if (bfd_get_section_by_name (abfd, ".SUNW_version"))
 115     return GDB_OSABI_SOLARIS;
 116
 117   return GDB_OSABI_UNKNOWN;
 118 }
 119
 120 /* Provide a prototype to silence -Wmissing-prototypes.  */
 121 void _initialize_i386_sol2_tdep (void);
 122
 123 void
 124 _initialize_i386_sol2_tdep (void)
 125 {
 126   /* Register an ELF OS ABI sniffer for Solaris 2 binaries.  */
 127   gdbarch_register_osabi_sniffer (bfd_arch_i386, bfd_target_elf_flavour,
 128                                   i386_sol2_osabi_sniffer);
 129
 130   gdbarch_register_osabi (bfd_arch_i386, 0, GDB_OSABI_SOLARIS,
 131                           i386_sol2_init_abi);
 132 }