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