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