gdb/i386-sol2-tdep.c

   1 /* Target-dependent code for Solaris x86.
   2
   3    Copyright (C) 2002-2024 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 "value.h"
  21 #include "osabi.h"
  22
  23 #include "sol2-tdep.h"
  24 #include "i386-tdep.h"
  25 #include "solib-svr4.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 /* Solaris doesn't have a `struct sigcontext', but it does have a
  49    `mcontext_t' that contains the saved set of machine registers.  */
  50
  51 static CORE_ADDR
  52 i386_sol2_mcontext_addr (const frame_info_ptr &this_frame)
  53 {
  54   CORE_ADDR sp, ucontext_addr;
  55
  56   sp = get_frame_register_unsigned (this_frame, I386_ESP_REGNUM);
  57   ucontext_addr = get_frame_memory_unsigned (this_frame, sp + 8, 4);
  58
  59   return ucontext_addr + 36;
  60 }
  61
  62 /* Solaris 2.  */
  63
  64 static void
  65 i386_sol2_init_abi (struct gdbarch_info info, struct gdbarch *gdbarch)
  66 {
  67   i386_gdbarch_tdep *tdep = gdbarch_tdep<i386_gdbarch_tdep> (gdbarch);
  68
  69   /* Solaris is SVR4-based.  */
  70   i386_svr4_init_abi (info, gdbarch);
  71
  72   sol2_init_abi (info, gdbarch);
  73
  74   /* Solaris reserves space for its FPU emulator in `fpregset_t'.
  75      There is also some space reserved for the registers of a Weitek
  76      math coprocessor.  */
  77   tdep->gregset_reg_offset = i386_sol2_gregset_reg_offset;
  78   tdep->gregset_num_regs = ARRAY_SIZE (i386_sol2_gregset_reg_offset);
  79   tdep->sizeof_gregset = 19 * 4;
  80   tdep->sizeof_fpregset = 380;
  81
  82   /* Signal trampolines are slightly different from SVR4.  */
  83   tdep->sigtramp_p = sol2_sigtramp_p;
  84   tdep->sigcontext_addr = i386_sol2_mcontext_addr;
  85   tdep->sc_reg_offset = tdep->gregset_reg_offset;
  86   tdep->sc_num_regs = tdep->gregset_num_regs;
  87
  88   /* Solaris has SVR4-style shared libraries.  */
  89   set_solib_svr4_fetch_link_map_offsets
  90     (gdbarch, svr4_ilp32_fetch_link_map_offsets);
  91 }
  92 \f
  93
  94 static enum gdb_osabi
  95 i386_sol2_osabi_sniffer (bfd *abfd)
  96 {
  97   /* If we have a section named .SUNW_version, then it is almost
  98      certainly Solaris 2.  */
  99   if (bfd_get_section_by_name (abfd, ".SUNW_version"))
 100     return GDB_OSABI_SOLARIS;
 101
 102   return GDB_OSABI_UNKNOWN;
 103 }
 104
 105 void _initialize_i386_sol2_tdep ();
 106 void
 107 _initialize_i386_sol2_tdep ()
 108 {
 109   /* Register an ELF OS ABI sniffer for Solaris 2 binaries.  */
 110   gdbarch_register_osabi_sniffer (bfd_arch_i386, bfd_target_elf_flavour,
 111                                   i386_sol2_osabi_sniffer);
 112
 113   gdbarch_register_osabi (bfd_arch_i386, 0, GDB_OSABI_SOLARIS,
 114                           i386_sol2_init_abi);
 115 }