gdb/i386-sol2-tdep.c

   1 /* Target-dependent code for Solaris x86.
   2    Copyright 2002, 2003 Free Software Foundation, Inc.
   3
   4    This file is part of GDB.
   5
   6    This program is free software; you can redistribute it and/or modify
   7    it under the terms of the GNU General Public License as published by
   8    the Free Software Foundation; either version 2 of the License, or
   9    (at your option) any later version.
  10
  11    This program is distributed in the hope that it will be useful,
  12    but WITHOUT ANY WARRANTY; without even the implied warranty of
  13    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14    GNU General Public License for more details.
  15
  16    You should have received a copy of the GNU General Public License
  17    along with this program; if not, write to the Free Software
  18    Foundation, Inc., 59 Temple Place - Suite 330,
  19    Boston, MA 02111-1307, USA.  */
  20
  21 #include "defs.h"
  22 #include "value.h"
  23 #include "osabi.h"
  24
  25 #include "i386-tdep.h"
  26
  27 /* From <ia32/sys/reg.h>.  */
  28 static int i386_sol2_gregset_reg_offset[] =
  29 {
  30   11 * 4,                       /* %eax */
  31   10 * 4,                       /* %ecx */
  32   9 * 4,                        /* %edx */
  33   8 * 4,                        /* %ebx */
  34   17 * 4,                       /* %esp */
  35   6 * 4,                        /* %ebp */
  36   5 * 4,                        /* %esi */
  37   4 * 4,                        /* %edi */
  38   14 * 4,                       /* %eip */
  39   16 * 4,                       /* %eflags */
  40   15 * 4,                       /* %cs */
  41   18 * 4,                       /* %ss */
  42   3 * 4,                        /* %ds */
  43   2 * 4,                        /* %es */
  44   1 * 4,                        /* %fs */
  45   0 * 4                         /* %gs */
  46 };
  47
  48 static int
  49 i386_sol2_pc_in_sigtramp (CORE_ADDR pc, char *name)
  50 {
  51   /* Signal handler frames under Solaris 2 are recognized by a return
  52      address of 0xffffffff.  */
  53   return (pc == 0xffffffff);
  54 }
  55
  56 /* Solaris doesn't have a `struct sigcontext', but it does have a
  57    `mcontext_t' that contains the saved set of machine registers.  */
  58
  59 static CORE_ADDR
  60 i386_sol2_mcontext_addr (struct frame_info *next_frame)
  61 {
  62   CORE_ADDR sp, ucontext_addr;
  63
  64   sp = frame_unwind_register_unsigned (next_frame, I386_ESP_REGNUM);
  65   ucontext_addr = get_frame_memory_unsigned (next_frame, sp + 8, 4);
  66
  67   return ucontext_addr + 36;
  68 }
  69
  70 /* Solaris 2.  */
  71
  72 static void
  73 i386_sol2_init_abi (struct gdbarch_info info, struct gdbarch *gdbarch)
  74 {
  75   struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch);
  76
  77   /* Solaris is SVR4-based.  */
  78   i386_svr4_init_abi (info, gdbarch);
  79
  80   /* Solaris reserves space for its FPU emulator in `fpregset_t'.
  81      There is also some space reserved for the registers of a Weitek
  82      math coprocessor.  */
  83   tdep->gregset_reg_offset = i386_sol2_gregset_reg_offset;
  84   tdep->gregset_num_regs = ARRAY_SIZE (i386_sol2_gregset_reg_offset);
  85   tdep->sizeof_gregset = 19 * 4;
  86   tdep->sizeof_fpregset = 380;
  87
  88   tdep->sigcontext_addr = i386_sol2_mcontext_addr;
  89   tdep->sc_reg_offset = tdep->gregset_reg_offset;
  90   tdep->sc_num_regs = tdep->gregset_num_regs;
  91
  92   /* Signal trampolines are slightly different from SVR4.  */
  93   set_gdbarch_pc_in_sigtramp (gdbarch, i386_sol2_pc_in_sigtramp);
  94 }
  95 \f
  96
  97 static enum gdb_osabi
  98 i386_sol2_osabi_sniffer (bfd *abfd)
  99 {
 100   /* If we have a section named .SUNW_version, then it is almost
 101      certainly Solaris 2.  */
 102   if (bfd_get_section_by_name (abfd, ".SUNW_version"))
 103     return GDB_OSABI_SOLARIS;
 104
 105   return GDB_OSABI_UNKNOWN;
 106 }
 107
 108 /* Provide a prototype to silence -Wmissing-prototypes.  */
 109 void _initialize_i386_sol2_tdep (void);
 110
 111 void
 112 _initialize_i386_sol2_tdep (void)
 113 {
 114   /* Register an ELF OS ABI sniffer for Solaris 2 binaries.  */
 115   gdbarch_register_osabi_sniffer (bfd_arch_i386, bfd_target_elf_flavour,
 116                                   i386_sol2_osabi_sniffer);
 117
 118   gdbarch_register_osabi (bfd_arch_i386, 0, GDB_OSABI_SOLARIS,
 119                           i386_sol2_init_abi);
 120 }