gdb/i386-sol2-tdep.c

   1 /* Target-dependent code for Solaris x86.
   2
   3    Copyright (C) 2002-2020 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 3 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, see <http://www.gnu.org/licenses/>.  */
  19
  20 #include "defs.h"
  21 #include "value.h"
  22 #include "osabi.h"
  23
  24 #include "sol2-tdep.h"
  25 #include "i386-tdep.h"
  26 #include "solib-svr4.h"
  27
  28 /* From <ia32/sys/reg.h>.  */
  29 static int i386_sol2_gregset_reg_offset[] =
  30 {
  31   11 * 4,                       /* %eax */
  32   10 * 4,                       /* %ecx */
  33   9 * 4,                        /* %edx */
  34   8 * 4,                        /* %ebx */
  35   17 * 4,                       /* %esp */
  36   6 * 4,                        /* %ebp */
  37   5 * 4,                        /* %esi */
  38   4 * 4,                        /* %edi */
  39   14 * 4,                       /* %eip */
  40   16 * 4,                       /* %eflags */
  41   15 * 4,                       /* %cs */
  42   18 * 4,                       /* %ss */
  43   3 * 4,                        /* %ds */
  44   2 * 4,                        /* %es */
  45   1 * 4,                        /* %fs */
  46   0 * 4                         /* %gs */
  47 };
  48
  49 /* Solaris doesn't have a `struct sigcontext', but it does have a
  50    `mcontext_t' that contains the saved set of machine registers.  */
  51
  52 static CORE_ADDR
  53 i386_sol2_mcontext_addr (struct frame_info *this_frame)
  54 {
  55   CORE_ADDR sp, ucontext_addr;
  56
  57   sp = get_frame_register_unsigned (this_frame, I386_ESP_REGNUM);
  58   ucontext_addr = get_frame_memory_unsigned (this_frame, sp + 8, 4);
  59
  60   return ucontext_addr + 36;
  61 }
  62
  63 /* Solaris 2.  */
  64
  65 static void
  66 i386_sol2_init_abi (struct gdbarch_info info, struct gdbarch *gdbarch)
  67 {
  68   struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch);
  69
  70   /* Solaris is SVR4-based.  */
  71   i386_svr4_init_abi (info, gdbarch);
  72
  73   sol2_init_abi (info, gdbarch);
  74
  75   /* Solaris reserves space for its FPU emulator in `fpregset_t'.
  76      There is also some space reserved for the registers of a Weitek
  77      math coprocessor.  */
  78   tdep->gregset_reg_offset = i386_sol2_gregset_reg_offset;
  79   tdep->gregset_num_regs = ARRAY_SIZE (i386_sol2_gregset_reg_offset);
  80   tdep->sizeof_gregset = 19 * 4;
  81   tdep->sizeof_fpregset = 380;
  82
  83   /* Signal trampolines are slightly different from SVR4.  */
  84   tdep->sigtramp_p = sol2_sigtramp_p;
  85   tdep->sigcontext_addr = i386_sol2_mcontext_addr;
  86   tdep->sc_reg_offset = tdep->gregset_reg_offset;
  87   tdep->sc_num_regs = tdep->gregset_num_regs;
  88
  89   /* Solaris has SVR4-style shared libraries.  */
  90   set_solib_svr4_fetch_link_map_offsets
  91     (gdbarch, svr4_ilp32_fetch_link_map_offsets);
  92 }
  93 \f
  94
  95 static enum gdb_osabi
  96 i386_sol2_osabi_sniffer (bfd *abfd)
  97 {
  98   /* If we have a section named .SUNW_version, then it is almost
  99      certainly Solaris 2.  */
 100   if (bfd_get_section_by_name (abfd, ".SUNW_version"))
 101     return GDB_OSABI_SOLARIS;
 102
 103   return GDB_OSABI_UNKNOWN;
 104 }
 105
 106 void _initialize_i386_sol2_tdep ();
 107 void
 108 _initialize_i386_sol2_tdep ()
 109 {
 110   /* Register an ELF OS ABI sniffer for Solaris 2 binaries.  */
 111   gdbarch_register_osabi_sniffer (bfd_arch_i386, bfd_target_elf_flavour,
 112                                   i386_sol2_osabi_sniffer);
 113
 114   gdbarch_register_osabi (bfd_arch_i386, 0, GDB_OSABI_SOLARIS,
 115                           i386_sol2_init_abi);
 116 }