gdb/i386-sol2-tdep.c

   1 /* Target-dependent code for Solaris x86.
   2
   3    Copyright (C) 2002, 2003, 2004, 2006, 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 "value.h"
  24 #include "osabi.h"
  25
  26 #include "gdb_string.h"
  27
  28 #include "sol2-tdep.h"
  29 #include "i386-tdep.h"
  30 #include "solib-svr4.h"
  31
  32 /* From <ia32/sys/reg.h>.  */
  33 static int i386_sol2_gregset_reg_offset[] =
  34 {
  35   11 * 4,                       /* %eax */
  36   10 * 4,                       /* %ecx */
  37   9 * 4,                        /* %edx */
  38   8 * 4,                        /* %ebx */
  39   17 * 4,                       /* %esp */
  40   6 * 4,                        /* %ebp */
  41   5 * 4,                        /* %esi */
  42   4 * 4,                        /* %edi */
  43   14 * 4,                       /* %eip */
  44   16 * 4,                       /* %eflags */
  45   15 * 4,                       /* %cs */
  46   18 * 4,                       /* %ss */
  47   3 * 4,                        /* %ds */
  48   2 * 4,                        /* %es */
  49   1 * 4,                        /* %fs */
  50   0 * 4                         /* %gs */
  51 };
  52
  53 /* Return whether the frame preceding NEXT_FRAME corresponds to a
  54    Solaris sigtramp routine.  */
  55
  56 static int
  57 i386_sol2_sigtramp_p (struct frame_info *next_frame)
  58 {
  59   CORE_ADDR pc = frame_pc_unwind (next_frame);
  60   char *name;
  61
  62   find_pc_partial_function (pc, &name, NULL, NULL);
  63   return (name && (strcmp ("sigacthandler", name) == 0
  64                    || strcmp (name, "ucbsigvechandler") == 0));
  65 }
  66
  67 /* Solaris doesn't have a `struct sigcontext', but it does have a
  68    `mcontext_t' that contains the saved set of machine registers.  */
  69
  70 static CORE_ADDR
  71 i386_sol2_mcontext_addr (struct frame_info *next_frame)
  72 {
  73   CORE_ADDR sp, ucontext_addr;
  74
  75   sp = frame_unwind_register_unsigned (next_frame, I386_ESP_REGNUM);
  76   ucontext_addr = get_frame_memory_unsigned (next_frame, sp + 8, 4);
  77
  78   return ucontext_addr + 36;
  79 }
  80
  81 /* Solaris 2.  */
  82
  83 static void
  84 i386_sol2_init_abi (struct gdbarch_info info, struct gdbarch *gdbarch)
  85 {
  86   struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch);
  87
  88   /* Solaris is SVR4-based.  */
  89   i386_svr4_init_abi (info, gdbarch);
  90
  91   /* Solaris reserves space for its FPU emulator in `fpregset_t'.
  92      There is also some space reserved for the registers of a Weitek
  93      math coprocessor.  */
  94   tdep->gregset_reg_offset = i386_sol2_gregset_reg_offset;
  95   tdep->gregset_num_regs = ARRAY_SIZE (i386_sol2_gregset_reg_offset);
  96   tdep->sizeof_gregset = 19 * 4;
  97   tdep->sizeof_fpregset = 380;
  98
  99   /* Signal trampolines are slightly different from SVR4.  */
 100   tdep->sigtramp_p = i386_sol2_sigtramp_p;
 101   tdep->sigcontext_addr = i386_sol2_mcontext_addr;
 102   tdep->sc_reg_offset = tdep->gregset_reg_offset;
 103   tdep->sc_num_regs = tdep->gregset_num_regs;
 104
 105   /* Solaris has SVR4-style shared libraries.  */
 106   set_gdbarch_skip_solib_resolver (gdbarch, sol2_skip_solib_resolver);
 107   set_solib_svr4_fetch_link_map_offsets
 108     (gdbarch, svr4_ilp32_fetch_link_map_offsets);
 109 }
 110 \f
 111
 112 static enum gdb_osabi
 113 i386_sol2_osabi_sniffer (bfd *abfd)
 114 {
 115   /* If we have a section named .SUNW_version, then it is almost
 116      certainly Solaris 2.  */
 117   if (bfd_get_section_by_name (abfd, ".SUNW_version"))
 118     return GDB_OSABI_SOLARIS;
 119
 120   return GDB_OSABI_UNKNOWN;
 121 }
 122
 123 /* Provide a prototype to silence -Wmissing-prototypes.  */
 124 void _initialize_i386_sol2_tdep (void);
 125
 126 void
 127 _initialize_i386_sol2_tdep (void)
 128 {
 129   /* Register an ELF OS ABI sniffer for Solaris 2 binaries.  */
 130   gdbarch_register_osabi_sniffer (bfd_arch_i386, bfd_target_elf_flavour,
 131                                   i386_sol2_osabi_sniffer);
 132
 133   gdbarch_register_osabi (bfd_arch_i386, 0, GDB_OSABI_SOLARIS,
 134                           i386_sol2_init_abi);
 135 }