Commit | Line | Data |
---|---|---|
c906108c | 1 | /* Target-dependent code for Intel 386 running LynxOS. |
82b47e62 | 2 | Copyright 1993, 1996, 2000, 2001, 2002 Free Software Foundation, Inc. |
c906108c | 3 | |
c5aa993b | 4 | This file is part of GDB. |
c906108c | 5 | |
c5aa993b JM |
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. | |
c906108c | 10 | |
c5aa993b JM |
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. | |
c906108c | 15 | |
c5aa993b JM |
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. */ | |
c906108c SS |
20 | |
21 | #include "defs.h" | |
c906108c | 22 | #include "gdbcore.h" |
82b47e62 | 23 | #include "inferior.h" |
4e052eda | 24 | #include "regcache.h" |
82b47e62 MK |
25 | #include "target.h" |
26 | ||
27 | #include "i386-tdep.h" | |
c906108c | 28 | |
82b47e62 MK |
29 | /* Return the PC of the caller from the call frame. Assumes the subr |
30 | prologue has already been executed, and the frame pointer setup. | |
31 | If this is the outermost frame, we check to see if we are in a | |
32 | system call by examining the previous instruction. If so, then the | |
33 | return PC is actually at SP+4 because system calls use a different | |
34 | calling sequence. */ | |
c906108c | 35 | |
82b47e62 | 36 | static CORE_ADDR |
fba45db2 | 37 | i386lynx_saved_pc_after_call (struct frame_info *frame) |
c906108c SS |
38 | { |
39 | char opcode[7]; | |
c5aa993b | 40 | static const unsigned char call_inst[] = |
82b47e62 | 41 | { 0x9a, 0, 0, 0, 0, 8, 0 }; /* lcall 0x8,0x0 */ |
c906108c | 42 | |
82b47e62 | 43 | read_memory_nobpt (frame->pc - 7, opcode, 7); |
c906108c | 44 | if (memcmp (opcode, call_inst, 7) == 0) |
82b47e62 MK |
45 | return read_memory_unsigned_integer (read_register (SP_REGNUM) + 4, 4); |
46 | ||
47 | return read_memory_unsigned_integer (read_register (SP_REGNUM), 4); | |
48 | } | |
49 | \f | |
50 | ||
51 | /* LynxOS. */ | |
52 | static void | |
53 | i386lynx_init_abi (struct gdbarch_info info, struct gdbarch *gdbarch) | |
54 | { | |
55 | set_gdbarch_saved_pc_after_call (gdbarch, i386lynx_saved_pc_after_call); | |
56 | } | |
57 | \f | |
58 | ||
59 | static enum gdb_osabi | |
60 | i386lynx_coff_osabi_sniffer (bfd *abfd) | |
61 | { | |
62 | if (strcmp (bfd_get_target (abfd), "coff-i386-lynx") == 0) | |
63 | return GDB_OSABI_LYNXOS; | |
64 | ||
65 | return GDB_OSABI_UNKNOWN; | |
66 | } | |
67 | ||
68 | \f | |
69 | /* Provide a prototype to silence -Wmissing-prototypes. */ | |
70 | void _initialize_i386lynx_tdep (void); | |
71 | ||
72 | void | |
73 | _initialize_i386bsd_tdep (void) | |
74 | { | |
75 | gdbarch_register_osabi_sniffer (bfd_arch_i386, bfd_target_coff_flavour, | |
76 | i386lynx_coff_osabi_sniffer); | |
c906108c | 77 | |
82b47e62 MK |
78 | gdbarch_register_osabi (bfd_arch_i386, GDB_OSABI_LYNXOS, |
79 | i386lynx_init_abi); | |
c906108c | 80 | } |