| 1 | /* Target-dependent code for OpenBSD/i386. |
| 2 | Copyright 1988, 1989, 1991, 1992, 1994, 1996, 2000, 2001, 2002, 2003 |
| 3 | 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 "arch-utils.h" |
| 24 | #include "gdbcore.h" |
| 25 | #include "regcache.h" |
| 26 | #include "osabi.h" |
| 27 | |
| 28 | #include "i386-tdep.h" |
| 29 | #include "i387-tdep.h" |
| 30 | |
| 31 | /* Provide a prototype to silence -Wmissing-prototypes. */ |
| 32 | void _initialize_i386obsd_tdep (void); |
| 33 | |
| 34 | #define SIZEOF_STRUCT_REG (16 * 4) |
| 35 | |
| 36 | static void |
| 37 | i386obsd_supply_reg (char *regs, int regno) |
| 38 | { |
| 39 | int i; |
| 40 | |
| 41 | for (i = 0; i <= 15; i++) |
| 42 | if (regno == i || regno == -1) |
| 43 | supply_register (i, regs + i * 4); |
| 44 | } |
| 45 | |
| 46 | static void |
| 47 | fetch_core_registers (char *core_reg_sect, unsigned core_reg_size, int which, |
| 48 | CORE_ADDR ignore) |
| 49 | { |
| 50 | char *regs, *fsave; |
| 51 | |
| 52 | /* We get everything from one section. */ |
| 53 | if (which != 0) |
| 54 | return; |
| 55 | |
| 56 | if (core_reg_size < (SIZEOF_STRUCT_REG + 108)) |
| 57 | { |
| 58 | warning ("Wrong size register set in core file."); |
| 59 | return; |
| 60 | } |
| 61 | |
| 62 | regs = core_reg_sect; |
| 63 | fsave = core_reg_sect + SIZEOF_STRUCT_REG; |
| 64 | |
| 65 | /* Integer registers. */ |
| 66 | i386obsd_supply_reg (regs, -1); |
| 67 | |
| 68 | /* Floating point registers. */ |
| 69 | i387_supply_fsave (current_regcache, -1, fsave); |
| 70 | } |
| 71 | |
| 72 | static struct core_fns i386obsd_core_fns = |
| 73 | { |
| 74 | bfd_target_unknown_flavour, /* core_flavour */ |
| 75 | default_check_format, /* check_format */ |
| 76 | default_core_sniffer, /* core_sniffer */ |
| 77 | fetch_core_registers, /* core_read_registers */ |
| 78 | NULL /* next */ |
| 79 | }; |
| 80 | \f |
| 81 | |
| 82 | CORE_ADDR i386obsd_sigtramp_start = 0xbfbfdf20; |
| 83 | CORE_ADDR i386obsd_sigtramp_end = 0xbfbfdff0; |
| 84 | |
| 85 | /* From <machine/signal.h>. */ |
| 86 | int i386obsd_sc_reg_offset[I386_NUM_GREGS] = |
| 87 | { |
| 88 | 10 * 4, /* %eax */ |
| 89 | 9 * 4, /* %ecx */ |
| 90 | 8 * 4, /* %edx */ |
| 91 | 7 * 4, /* %ebx */ |
| 92 | 14 * 4, /* %esp */ |
| 93 | 6 * 4, /* %ebp */ |
| 94 | 5 * 4, /* %esi */ |
| 95 | 4 * 4, /* %edi */ |
| 96 | 11 * 4, /* %eip */ |
| 97 | 13 * 4, /* %eflags */ |
| 98 | 12 * 4, /* %cs */ |
| 99 | 15 * 4, /* %ss */ |
| 100 | 3 * 4, /* %ds */ |
| 101 | 2 * 4, /* %es */ |
| 102 | 1 * 4, /* %fs */ |
| 103 | 0 * 4 /* %gs */ |
| 104 | }; |
| 105 | |
| 106 | static void |
| 107 | i386obsd_init_abi (struct gdbarch_info info, struct gdbarch *gdbarch) |
| 108 | { |
| 109 | struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch); |
| 110 | |
| 111 | /* Obviously OpenBSD is BSD-based. */ |
| 112 | i386bsd_init_abi (info, gdbarch); |
| 113 | |
| 114 | /* OpenBSD uses -freg-struct-return by default. */ |
| 115 | tdep->struct_return = reg_struct_return; |
| 116 | |
| 117 | /* OpenBSD uses a different memory layout. */ |
| 118 | tdep->sigtramp_start = i386obsd_sigtramp_start; |
| 119 | tdep->sigtramp_end = i386obsd_sigtramp_end; |
| 120 | |
| 121 | /* OpenBSD has a `struct sigcontext' that's different from the |
| 122 | origional 4.3 BSD. */ |
| 123 | tdep->sc_reg_offset = i386obsd_sc_reg_offset; |
| 124 | tdep->sc_num_regs = I386_NUM_GREGS; |
| 125 | } |
| 126 | |
| 127 | void |
| 128 | _initialize_i386obsd_tdep (void) |
| 129 | { |
| 130 | add_core_fns (&i386obsd_core_fns); |
| 131 | |
| 132 | /* FIXME: kettenis/20021020: Since OpenBSD/i386 binaries are |
| 133 | indistingushable from NetBSD/i386 a.out binaries, building a GDB |
| 134 | that should support both these targets will probably not work as |
| 135 | expected. */ |
| 136 | #define GDB_OSABI_OPENBSD_AOUT GDB_OSABI_NETBSD_AOUT |
| 137 | |
| 138 | gdbarch_register_osabi (bfd_arch_i386, 0, GDB_OSABI_OPENBSD_AOUT, |
| 139 | i386obsd_init_abi); |
| 140 | } |