| 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 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., 51 Franklin Street, Fifth Floor, |
| 20 | Boston, MA 02110-1301, 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 | #include "inf-ptrace.h" |
| 48 | |
| 49 | /* Address of the user structure. This is the the value for 32V; 3BSD |
| 50 | uses a different value, but hey, who's still using those systems? */ |
| 51 | static CORE_ADDR vax_kernel_u_addr = 0x80020000; |
| 52 | |
| 53 | /* Location of the user's stored registers; usage is `u.u_ar0[XX]'. |
| 54 | For 4.2BSD and ULTRIX these are negative! See <machine/reg.h>. */ |
| 55 | static int vax_register_index[] = |
| 56 | { |
| 57 | R0, R1, R2, R3, R4, R5, |
| 58 | R6, R7, R8, R9, R10, R11, |
| 59 | AP, FP, SP, PC, PS |
| 60 | }; |
| 61 | |
| 62 | static CORE_ADDR |
| 63 | vax_register_u_addr (CORE_ADDR u_ar0, int regnum) |
| 64 | { |
| 65 | gdb_assert (regnum >= 0 && regnum < ARRAY_SIZE (vax_register_index)); |
| 66 | |
| 67 | /* Type is `int *u_ar0'. See <sys/user.h>. */ |
| 68 | return u_ar0 + vax_register_index[regnum - VAX_R0_REGNUM] * 4; |
| 69 | } |
| 70 | |
| 71 | static CORE_ADDR |
| 72 | vax_register_u_offset (struct gdbarch *gdbarch, int regnum, int store_p) |
| 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 | \f |
| 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 | add_target (inf_ptrace_trad_target (vax_register_u_offset)); |
| 108 | } |