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