1 /* Target-dependent code for i386 BSD's. 2 3 Copyright (C) 2001-2020 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 "defs.h" 21 #include "arch-utils.h" 22 #include "frame.h" 23 #include "gdbcore.h" 24 #include "regcache.h" 25 #include "osabi.h" 26 27 #include "i386-tdep.h" 28 29 /* Support for signal handlers. */ 30 31 /* Assuming THIS_FRAME is for a BSD sigtramp routine, return the 32 address of the associated sigcontext structure. */ 33 34 static CORE_ADDR 35 i386bsd_sigcontext_addr (struct frame_info *this_frame) 36 { 37 struct gdbarch *gdbarch = get_frame_arch (this_frame); 38 enum bfd_endian byte_order = gdbarch_byte_order (gdbarch); 39 gdb_byte buf[4]; 40 CORE_ADDR sp; 41 42 get_frame_register (this_frame, I386_ESP_REGNUM, buf); 43 sp = extract_unsigned_integer (buf, 4, byte_order); 44 45 return read_memory_unsigned_integer (sp + 8, 4, byte_order); 46 } 47 48 49 /* Support for shared libraries. */ 50 51 /* Traditional BSD (4.3 BSD, still used for BSDI and 386BSD). */ 52 53 /* From <machine/signal.h>. */ 54 int i386bsd_sc_reg_offset[] = 55 { 56 -1, /* %eax */ 57 -1, /* %ecx */ 58 -1, /* %edx */ 59 -1, /* %ebx */ 60 8 + 0 * 4, /* %esp */ 61 8 + 1 * 4, /* %ebp */ 62 -1, /* %esi */ 63 -1, /* %edi */ 64 8 + 3 * 4, /* %eip */ 65 8 + 4 * 4, /* %eflags */ 66 -1, /* %cs */ 67 -1, /* %ss */ 68 -1, /* %ds */ 69 -1, /* %es */ 70 -1, /* %fs */ 71 -1 /* %gs */ 72 }; 73 74 void 75 i386bsd_init_abi (struct gdbarch_info info, struct gdbarch *gdbarch) 76 { 77 struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch); 78 79 tdep->jb_pc_offset = 0; 80 81 tdep->sigtramp_start = 0xfdbfdfc0; 82 tdep->sigtramp_end = 0xfdbfe000; 83 tdep->sigcontext_addr = i386bsd_sigcontext_addr; 84 tdep->sc_reg_offset = i386bsd_sc_reg_offset; 85 tdep->sc_num_regs = ARRAY_SIZE (i386bsd_sc_reg_offset); 86 } 87 88 89