1/* Native-dependent code for VAX UNIXen (including older BSD's). 2 3 Copyright (C) 2004, 2005, 2007 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 "inferior.h" 22 23#include "gdb_assert.h" 24#include <sys/types.h> 25#include <sys/dir.h> 26#include <sys/user.h> 27 28#ifdef HAVE_SYS_PTRACE_H 29#include <sys/ptrace.h> 30#endif 31 32#ifndef PT_READ_U 33#define PT_READ_U 3 34#endif 35 36#ifdef SYS_REG_H 37/* UNIX 32V and derivatives (including 3BSD). */ 38#include <sys/reg.h> 39#else 40/* 4.2BSD and derivatives. */ 41#include <machine/reg.h> 42#endif 43 44#include "vax-tdep.h" 45#include "inf-ptrace.h" 46 47/* Address of the user structure. This is the the value for 32V; 3BSD 48 uses a different value, but hey, who's still using those systems? */ 49static CORE_ADDR vax_kernel_u_addr = 0x80020000; 50 51/* Location of the user's stored registers; usage is `u.u_ar0[XX]'. 52 For 4.2BSD and ULTRIX these are negative! See <machine/reg.h>. */ 53static int vax_register_index[] = 54{ 55 R0, R1, R2, R3, R4, R5, 56 R6, R7, R8, R9, R10, R11, 57 AP, FP, SP, PC, PS 58}; 59 60static CORE_ADDR 61vax_register_u_addr (CORE_ADDR u_ar0, int regnum) 62{ 63 gdb_assert (regnum >= 0 && regnum < ARRAY_SIZE (vax_register_index)); 64 65 /* Type is `int *u_ar0'. See <sys/user.h>. */ 66 return u_ar0 + vax_register_index[regnum - VAX_R0_REGNUM] * 4; 67} 68 69static CORE_ADDR 70vax_register_u_offset (struct gdbarch *gdbarch, int regnum, int store_p) 71{ 72 size_t u_ar0_offset = offsetof (struct user, u_ar0); 73 CORE_ADDR u_ar0; 74 int pid; 75 76 errno = 0; 77 pid = PIDGET (inferior_ptid); 78 u_ar0 = ptrace (PT_READ_U, pid, u_ar0_offset, 0); 79 if (errno) 80 perror_with_name (_("Unable to determine location of registers")); 81 82 return vax_register_u_addr (u_ar0, regnum) - vax_kernel_u_addr; 83} 84 85 86#include <nlist.h> 87 88#ifndef _PATH_UNIX 89#define _PATH_UNIX "/vmunix" 90#endif 91 92/* Provide a prototype to silence -Wmissing-prototypes. */ 93void _initialize_vax_nat (void); 94 95void 96_initialize_vax_nat (void) 97{ 98 struct nlist names[2]; 99 100 names[0].n_name = "_u"; 101 names[1].n_name = NULL; 102 if (nlist (_PATH_UNIX, names) == 0) 103 vax_kernel_u_addr = names[0].n_value; 104 105 add_target (inf_ptrace_trad_target (vax_register_u_offset)); 106} 107