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>.  */
28static 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
48static int
49i386_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
59static CORE_ADDR
60i386_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
72static void
73i386_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
96
97static enum gdb_osabi
98i386_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.  */
109void _initialize_i386_sol2_tdep (void);
110
111void
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}
121